ON/OFF
COUT
2.2 µF
LP2985
ON/OFF CBYPASS
0.01 µF
GND
IN
BYPASS
OUT VOUT
VIN
CIN
1 µF
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intellectual property matters and other important disclaimers. PRODUCTION DATA.
LP2985-N
SNVS018Y –MARCH 2000–REVISED DECEMBER 2016
LP2985-N Micropower 150-mA Low-Noise Ultra-Low-Dropout Regulator in a SOT-23
Package Designed for Use With Very Low ESR Output Capacitors
1
1 Features
1• Input Voltage Range: 2.5 V to 16 V
• Ultra Low-Dropout Voltage
• Ensured 150 mA Output Current
• Requires Minimum External Components
• Stable With Low-ESR Output Capacitor
• < 1 µA Quiescent Current When Shut Down
• Low Ground Pin Current at All Loads
• Output Voltage Accuracy 1% (A Grade)
• High Peak Current Capability
• Low ZOUT: 0.3 ΩTypical (10 Hz to 1 MHz)
• Overtemperature and Overcurrent Protection
•−40°C to 125°C Junction Temperature Range
• Custom Voltages Available
2 Applications
• Cellular Phones
• Palmtop and Laptop Computers
• Personal Digital Assistants (PDA)
• Camcorders, Personal Stereos, Cameras
3 Description
The LP2985-N low noise linear (LDO) regulator
delivers up to 150-mA output current and only
requires 300-mV dropout voltage of input to output.
Using an optimized vertically integrated PNP (VIP)
process, the LP2985-N delivers unequaled
performance for all battery-powered designs. The
LP2985-N device provides 1% tolerance precision
output voltage with only 75-µA quiescent current at 1-
mA load and 850 µA at 150-mA load. By adding a 10-
nF bypass capacitor, the output noise can be reduced
to 30 µVRMS in a 30-kHz bandwidth.
The LP2985-N is designed to work with a ceramic
output capacitor with equivalent series resistance
(ESR) as low as 5 mΩ. The device is available with
fixed output voltage from 2.5 V to 6.1 V. Contact
Texas Instrument Sales for specific voltage option
needs.
Device Information(1)
PART NUMBER PACKAGE BODY SIZE (NOM)
LP2985-N SOT-23 (5) 2.90 mm x 1.60 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
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Table of Contents
1 Features.................................................................. 1
2 Applications ........................................................... 1
3 Description............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions......................... 3
6 Specifications......................................................... 4
6.1 Absolute Maximum Ratings ...................................... 4
6.2 ESD Ratings.............................................................. 4
6.3 Recommended Operating Conditions....................... 4
6.4 Thermal Information.................................................. 5
6.5 Electrical Characteristics........................................... 5
6.6 Typical Characteristics.............................................. 7
7 Detailed Description............................................ 11
7.1 Overview................................................................. 11
7.2 Functional Block Diagram....................................... 11
7.3 Feature Description................................................. 11
7.4 Device Functional Modes........................................ 13
8 Application and Implementation ........................ 14
8.1 Application Information............................................ 14
8.2 Typical Application.................................................. 14
9 Power Supply Recommendations...................... 21
10 Layout................................................................... 21
10.1 Layout Guidelines ................................................. 21
10.2 Layout Example .................................................... 21
11 Device and Documentation Support................. 22
11.1 Documentation Support ........................................ 22
11.2 Receiving Notification of Documentation Updates 22
11.3 Community Resources.......................................... 22
11.4 Trademarks........................................................... 22
11.5 Electrostatic Discharge Caution............................ 22
11.6 Glossary................................................................ 22
12 Mechanical, Packaging, and Orderable
Information........................................................... 22
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision X (May 2015) to Revision Y Page
• Added top nav icon for TI Designs ........................................................................................................................................ 1
• Deleted "Smallest Possible Size (SOT-23 Package)" from Features..................................................................................... 1
• Deleted all information re: DSBGA package - it is no longer available ................................................................................. 1
• Deleted DSBGA pin function info from Pin Functions............................................................................................................ 3
• Deleted infor re: DSBGA package; changed "...value of RθJA for the SOT-23 package is 175.7°C/W ..." to "...value of
RθJA for the SOT-23 package is 169.0°C/W..." in footnote 3 to Abs Max table - see update thermal info for SOT-23
in Thermal Information............................................................................................................................................................ 4
• Changed "All pins except 3 and 4 (SOT-23)" to "Pins 3 and 4 ." .......................................................................................... 4
• Changed thermal values for SOT-23 package; added Note 2 to Thermal Information table ................................................ 5
• Deleted footnote 1 to Electrical Characteristics ..................................................................................................................... 5
• Changed content in last 2 paragraphs of Reverse Input-Output Voltage ........................................................................... 17
• Added Power Dissipation and Estimating Junction Temperature subsections ................................................................... 18
Changes from Revision W (September 2014) to Revision X Page
• Changed pin names in text and app circuit drawing "VOUT" and "VIN" to "OUT" and "IN"; replace Handling Ratings
with ESD Ratings; update Thermal Values ........................................................................................................................... 1
• Changed footnote 1 to Ab Max table per new format ........................................................................................................... 4
• Changed location of storage temperature range from Handling Ratings to Ab Max table..................................................... 4
• Added required Application Information section .................................................................................................................. 14
Changes from Revision V (April 2013) to Revision W Page
• Added Pin Configuration and Functions section, Handling Rating table, Feature Description section, Device
Functional Modes,Application and Implementation section, Power Supply Recommendations section, Layout
section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information .................. 1
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Changes from Revision U (April 2013) to Revision V Page
• Changed layout of National Semiconductor data sheet ...................................................................................................... 22
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5 Pin Configuration and Functions
DBV Package
5 Pin SOT-23
Top View
Pin Functions
PIN TYPE DESCRIPTION
NAME NO.
BYPASS 4 I/O Bypass capacitor for low noise operation
GND 2 — Common ground (device substrate)
IN 1 I Input voltage
ON/OFF 3 I Logic high enable input
OUT 5 O Regulated output voltage
J_MAX A
MAX JA
T T
PR
T
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(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3) The maximum allowable power dissipation is a function of the maximum junction temperature, TJ_MAX, the junction-to-ambient thermal
resistance, RθJA, and the ambient temperature, TA. The maximum allowable power dissipation at any ambient temperature is calculated
using:
Where the value of RθJA for the SOT-23 package is 169.0°C/W in a typical PC board mounting.
Exceeding the maximum allowable dissipation will cause excessive die temperature, and the regulator will go into thermal shutdown.
(4) For 12-V option, output voltage survival: –0.3 to +16 V. If used in a dual-supply system where the regulator load is returned to a
negative supply, the LP2985-N output must be diode-clamped to ground.
(5) The output PNP structure contains a diode between the IN to OUT pins that is normally reverse-biased. Reversing the polarity from IN to
OUT will turn on this diode.
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
Operating junction temperature –40 125 °C
Power dissipation(3) Internally Limited
Input supply voltage (survival) –0.3 16 V
Input supply voltage (operating) 2.5 16 V
Shutdown input voltage (survival) –0.3 16 V
Output voltage (survival)(4) –0.3 9 V
IOUT (survival) Short Circuit Protected
Input-output voltage (survival)(5) –0.3 16 V
Storage temperature, Tstg –65 150 °C
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
6.2 ESD Ratings VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per
ANSI/ESDA/JEDEC JS-001(1) Pins 3 and 4 ±1000 V
Pins 1, 2, and 5 ±2000
(1) Recommended minimum VIN is the greater of 3.1 V or VOUT(MAX) + rated dropout voltage (maximum) for operating load current.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted) MIN MAX UNIT
VIN Supply input voltage 3.1(1) 16 V
VON/OFF ON/OFF input voltage 0 VIN V
IOUT Output current 150 mA
TJOperating junction temperature –40 125 °C
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(1) For more information about traditional and new thermal metrics, see Semiconductor and IC Package Thermal Metrics application report,
SPRA953.
(2) Thermal resistance value RθJA is based on the EIA/JEDEC High-K printed circuit board defined by JESD51-7 High Effective Thermal
Conductivity Test Board for Leaded Surface Mount Packages.
6.4 Thermal Information
THERMAL METRIC(1) LP2985-N
UNITDBV (SOT-23)
5 PINS
RθJA Junction-to-ambient thermal resistance, High K(2) 169.0 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 121.8 °C/W
RθJB Junction-to-board thermal resistance 29.5 °C/W
ψJT Junction-to-top characterization parameter 16.1 °C/W
ψJB Junction-to-board characterization parameter 29.0 °C/W
(1) Limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation using Statistical
Quality Control (SQC) methods. The limits are used to calculate TI's Average Outgoing Quality Level (AOQL).
(2) Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a
1-V differential.
6.5 Electrical Characteristics
Unless otherwise specified: VIN = VO(NOM) + 1 V, IL= 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2 V, TJ= 25°C.
PARAMETER TEST CONDITIONS TYP LP2985AI-X.X(1) LP2985I-X.X(1) UNIT
MIN MAX MIN MAX
ΔVOOutput voltage tolerance
IL= 1 mA −1 1 –1.5 1.5
%VNOM
1 mA ≤IL≤50 mA −1.5 1.5 –2.5 2.5
1 mA ≤IL≤50 mA, –40°C ≤TJ
≤125°C −2.5 2.5 –3.5 3.5
1 mA ≤IL≤150 mA −2.5 2.5 –3 3
1 mA ≤IL≤150 mA, –40°C ≤
TJ≤125°C −3.5 3.5 –4 4
ΔVO/ΔVIN
Output voltage VO(NOM)+1 V ≤VIN ≤16 V 0.007 0.014 0.014 %/V
Line regulation VO(NOM)+1 V ≤VIN ≤16 V,
–40°C ≤TJ≤125°C 0.032 0.032
VIN–VODropout voltage(2)
IL= 0 mA 1 3 3
mV
IL= 0 mA, –40°C ≤TJ≤125°C 5 5
IL= 1 mA 7 10 10
IL= 1 mA, –40°C ≤TJ≤125°C 15 15
IL= 10 mA 40 60 60
IL= 10 mA, –40°C ≤TJ≤
125°C 90 90
IL= 50 mA 120 150 150
IL= 50 mA, –40°C ≤TJ≤
125°C 225 225
IL= 150 mA 280 350 350
IL= 150 mA, –40°C ≤TJ≤
125°C 575 575
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Electrical Characteristics (continued)
Unless otherwise specified: VIN = VO(NOM) + 1 V, IL= 1 mA, CIN = 1 µF, COUT = 4.7 µF, VON/OFF = 2 V, TJ= 25°C.
PARAMETER TEST CONDITIONS TYP LP2985AI-X.X(1) LP2985I-X.X(1) UNIT
MIN MAX MIN MAX
(3) The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to ON/OFF Input Operation.
(4) The LP2985-N has foldback current limiting which allows a high peak current when VOUT > 0.5 V, and then reduces the maximum output
current as VOUT is forced to ground (see Typical Characteristics curves).
IGND Ground pin current
IL= 0 mA 65 95 95
µA
IL= 0 mA, –40°C ≤TJ≤125°C 125 125
IL= 1 mA 75 110 110
IL= 1 mA, –40°C ≤TJ≤125°C 170 170
IL= 10 mA 120 220 220
IL= 10 mA, –40°C ≤TJ≤
125°C 400 400
IL= 50 mA 350 600 600
IL= 50 mA, –40°C ≤TJ≤
125°C 1000 1000
IL= 150 mA 850 1500 1500
IL= 150 mA, –40°C ≤TJ≤
125°C 2500 2500
VON/OFF < 0.3 V 0.01 0.8 0.8
VON/OFF < 0.15 V, –40°C ≤TJ≤
125°C 0.05 2 2
VON/OFF ON/OFF input voltage(3)
High = O/P ON 1.4
V
High = O/P ON, –40°C ≤TJ≤
125°C 1.6 1.6
Low = O/P OFF 0.55
Low = O/P OFF, –40°C ≤TJ≤
125°C 0.15 0.15
ION/OFF ON/OFF input current
VON/OFF = 0 V 0.01
µA
VON/OFF = 0 V, –40°C ≤TJ≤
125°C −2−2
VON/OFF = 5 V 5
VON/OFF = 5 V, –40°C ≤TJ≤
125°C 15 15
enOutput noise voltage
(RMS)
BW = 300 Hz to 50 kHz, µVCOUT = 10 µF 30
CBYPASS = 10 nF
ΔVO/ΔVIN Ripple rejection f = 1 kHz, CBYPASS = 10 nF 45 dB
COUT = 10 µF
IO(SC) Short circuit current RL= 0 Ω(steady state)(4) 400 mA
IO(PK) Peak output current VOUT ≥VO(NOM) –5% 350 mA
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6.6 Typical Characteristics
Unless otherwise specified: CIN = 1 µF, COUT = 4.7 µF, VIN = VOUT(NOM) + 1, TA= 25°C, ON/OFF pin is tied to VIN.
Figure 1. VOUT vs Temperature Figure 2. Short Circuit Current vs Output Voltage
Figure 3. Ripple Rejection Figure 4. Ripple Rejection
Figure 5. Ripple Rejection Figure 6. Ripple Rejection
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Typical Characteristics (continued)
Unless otherwise specified: CIN = 1 µF, COUT = 4.7 µF, VIN = VOUT(NOM) + 1, TA= 25°C, ON/OFF pin is tied to VIN.
Figure 7. Ripple Rejection Figure 8. Ripple Rejection
Figure 9. Ripple Rejection Figure 10. Ripple Rejection
Figure 11. Ripple Rejection Figure 12. Output Impedance vs Frequency
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Typical Characteristics (continued)
Unless otherwise specified: CIN = 1 µF, COUT = 4.7 µF, VIN = VOUT(NOM) + 1, TA= 25°C, ON/OFF pin is tied to VIN.
Figure 13. Output Impedance vs Frequency Figure 14. Output Noise Density
Figure 15. Output Noise Density Figure 16. Ground Pin vs Load Current
Figure 17. Dropout Voltage vs Temperature Figure 18. Input Current vs Pin
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Typical Characteristics (continued)
Unless otherwise specified: CIN = 1 µF, COUT = 4.7 µF, VIN = VOUT(NOM) + 1, TA= 25°C, ON/OFF pin is tied to VIN.
Figure 19. GND Pin Current vs Temperature Figure 20. Instantaneous Short Circuit Current
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7 Detailed Description
7.1 Overview
The LP2985-N family of fixed-output, ultra-low-dropout and low-noise regulators offers exceptional, cost-effective
performance for battery-powered applications. Available in output voltages from 2.5 V to 5 V, the family has an
output tolerance of 1% for the A version (1.5% for the non-A version) and is capable of delivering 150-mA
continuous load current. Standard regulator features, such as overcurrent and overtemperature protection, are
also included.
Using an optimized vertically integrated PNP (VIP) process, the LP2985-N contains several features to facilitate
battery powered designs:
• Multiple voltage options
• Low dropout voltage, typical dropout of 300 mV at 150-mA load current and 7 mV at 1-mA load.
• Low quiescent current and low ground current, typically 850-μA at 150 mA load, and 75-μA at 1-mA load.
• A shutdown feature is available, allowing the regulator to consume only 0.01-µA typically when the ON/OFF
pin is pulled low.
• Overtemperature protection and overcurrent protection circuitry is designed to safeguard the device during
unexpected conditions
• Enhanced stability: The LP2985-N is stable with output capacitor ESR as low as 5 mΩ, which allows the use
of ceramic capacitors on the output.
• Low noise: A BYPASS pin allows for low-noise operation, with a typical output noise of 30 µVRMS, with the
use of a 10-nF bypass capacitor.
7.2 Functional Block Diagram
7.3 Feature Description
7.3.1 Multiple Voltage Options
In order to meet different application’s requirement, the LP2985-N family provide multiple fixed output options
from 2.5 V to 6.1 V. Consult factory for custom voltages.
7.3.2 Output Voltage Accuracy
Output voltage accuracy specifies minimum and maximum output voltage error, relative to the expected nominal
output voltage stated as a percent. This accuracy error includes the errors introduced by the internal reference
and the load and line regulation across the full range of rated load and line operating conditions over
temperature, unless otherwise specified by the Electrical Characteristics. Output voltage accuracy also accounts
for all variations between manufacturing lots.
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Feature Description (continued)
7.3.3 Ultra-Low-Dropout Voltage
Generally speaking, the dropout voltage often refers to the voltage difference between the input and output
voltage (VDO = VIN – VOUT), where the main current pass-FET is fully on in the ohmic region of operation and is
characterized by the classic RDS(ON) of the FET. VDO indirectly specifies a minimum input voltage above the
nominal programmed output voltage at which the output voltage is expected to remain within its accuracy
boundary. If the input falls below this VDO limit (VIN < VOUT + VDO), then the output voltage decreases in order to
follow the input voltage.
7.3.4 Low Ground Current
LP2985-N uses a vertical PNP process which allows for quiescent currents that are considerably lower than
those associated with traditional lateral PNP regulators, typically 850 μA at 150-mA load and 75 μA at 1-mA load.
7.3.5 Sleep Mode
When pull ON/OFF pin to low level, LP2985-N enters sleep mode, and less than 2-μA quiescent current is
consumed. This function is designed for the application which needs a sleep mode to effectively enhance battery
life cycle.
7.3.6 Internal Protection Circuitry
7.3.6.1 Short Circuit Protection (Current Limit)
The internal current limit circuit is used to protect the LDO against high-load current faults or shorting events. The
LDO is not designed to operate in a steady-state current limit. During a current-limit event, the LDO sources
constant current. Therefore, the output voltage falls when load impedance decreases. Note also that if a current
limit occurs and the resulting output voltage is low, excessive power may be dissipated across the LDO, resulting
in a thermal shutdown of the output.
A foldback feature limits the short-circuit current to protect the regulator from damage under all load conditions. If
VOUT is forced below 0 V before EN goes high and the load current required exceeds the foldback current limit,
the device may not start up correctly.
7.3.6.2 Thermal Protection
The LP2985-N contains a thermal shutdown protection circuit to turn off the output current when excessive heat
is dissipated in the LDO. The thermal time-constant of the semiconductor die is fairly short, and thus the output
cycles on and off at a high rate when thermal shutdown is reached until the power dissipation is reduced.
The internal protection circuitry of the LP2985-N is designed to protect against thermal overload conditions. The
circuitry is not intended to replace proper heat sinking. Continuously running the device into thermal shutdown
degrades its reliability.
7.3.7 Enhanced Stability
The LP2985-N is designed specifically to work with ceramic output capacitors, utilizing circuitry which allows the
regulator to be stable across the entire range of output current with an output capacitor whose ESR is as low as
5 mΩ. For output capacitor requirement, please refer to Output Capacitor.
7.3.8 Low Noise
The LP2985-N includes a low-noise reference ensuring minimal noise during operation because the internal
reference is normally the dominant term in noise analysis. Further noise reduction can be achieved by adding an
external bypass bapacitor between the BYPASS pin and the GND pin.
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7.4 Device Functional Modes
7.4.1 Operation with VOUT(TARGET) + 0.6 V ≥VIN > 16 V
The device operate if the input voltage is equal to, or exceeds VOUT(TARGET) + 0.6 V. At input voltages below the
minimum VIN requirement, the devices do not operate correctly and output voltage may not reach target value.
7.4.2 Operation With ON/OFF Control
If the voltage on the ON/OFF pin is less than 0.15 V, the device is disabled, and in this state shutdown current
does not exceed 2 μA. Raising ON/OFF above 1.6 V initiates the start-up sequence of the device.
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The LP2985-N is a linear voltage regulator operating from 2.5 V to 16 V on the input and regulates voltages
between 2.5 V to 6.1 V with 1% accuracy and 150-mA maximum output current. Efficiency is defined by the ratio
of output voltage to input voltage because the LP2985-N is a linear voltage regulator. To achieve high efficiency,
the dropout voltage (VIN – VOUT) must be as small as possible, thus requiring a very-low-dropout LDO.
Successfully implementing an LDO in an application depends on the application requirements. If the
requirements are simply input voltage and output voltage, compliance specifications (such as internal power
dissipation or stability) must be verified to ensure a solid design. If timing, start-up, noise, power supply rejection
ratio (PSRR), or any other transient specification is required, then the design becomes more challenging.
8.2 Typical Application
*ON/OFF input must be actively terminated. Tie to VIN if this function is not to be used.
**Minimum capacitance is shown to ensure stability (may be increased without limit). Ceramic capacitor required for
output (see Output Capacitor).
***Reduces output noise (may be omitted if application is not noise critical). Use ceramic or film type with very low
leakage current (see Noise Bypass Capacitor).
Figure 21. Typical Application Schematic
8.2.1 Design Requirements
For typical design parameters, see Table 1.
Table 1. Design Parameters
DESIGN PARAMETERS VALUE
Input voltage 4.3 V, ±10% provided by the DC-DC converter switching at 1 MHz
Output voltage 3.3 V, ±5%
Output current 150 mA (maximum), 1 mA (minimum)
RMS noise, 300 Hz to 50 kHz < 50 µVRMS
PSRR at 1 kHz > 40 dB
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8.2.2 Detailed Design Procedure
At 150-mA loading, the dropout of the LP2985-N has 575-mV maximum dropout over temperature, thus an 1000-
mV headroom is sufficient for operation over both input and output voltage accuracy. The efficiency of the
LP2985-N in this configuration is VOUT / VIN = 76.7%. To achieve the smallest form factor, the SOT-23 package is
selected.
Input and output capacitors are selected in accordance with the Capacitor Characteristics section. Ceramic
capacitances of 1 μF for the input and one 2.2-μF capacitor for the output are selected. With an efficiency of
76.7% and a 150-mA maximum load, the internal power dissipation is 150 mW, which corresponds to a 26°C
junction temperature rise for the SOT-23 package. With an 85°C maximum ambient temperature, the junction
temperature is at 111°C. To minimize noise, a bypass capacitance (CBYPASS) of 0.01 μF is selected.
8.2.2.1 External Capacitors
Like any low-dropout regulator, the LP2985-N requires external capacitors for regulator stability. These
capacitors must be correctly selected for good performance.
8.2.2.1.1 Input Capacitor
An input capacitor whose capacitance is ≥1 µF is required between the LP2985-N input and ground (the amount
of capacitance may be increased without limit).
This capacitor must be located a distance of not more than 1 cm from the input pin and returned to a clean
analog ground. Any good quality ceramic, tantalum, or film capacitor may be used at the input.
NOTE
Tantalum capacitors can suffer catastrophic failure due to surge current when connected
to a low-impedance source of power (like a battery or very large capacitor). If a Tantalum
capacitor is used at the input, it must be ensured by the manufacturer to have a surge
current rating sufficient for the application.
There are no requirements for ESR on the input capacitor, but tolerance and temperature coefficient must be
considered when selecting the capacitor to ensure the capacitance will be ≥1 µF over the entire operating
temperature range.
8.2.2.1.2 Output Capacitor
The LP2985-N is designed specifically to work with ceramic output capacitors, utilizing circuitry which allows the
regulator to be stable across the entire range of output current with an output capacitor whose ESR is as low as
5 mΩ. It may also be possible to use tantalum or film capacitors at the output, but these are not as attractive for
reasons of size and cost (see Capacitor Characteristics).
The output capacitor must meet the requirement for minimum amount of capacitance and also have an ESR
value which is within the stable range. Curves are provided which show the stable ESR range as a function of
load current (see Figure 22).
Figure 22. ESR Graph
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NOTE
The output capacitor must maintain its ESR within the stable region over the full operating
temperature range of the application to assure stability.
The LP2985-N requires a minimum of 2.2 µF on the output (output capacitor size can be increased without limit).
It is important to remember that capacitor tolerance and variation with temperature must be taken into
consideration when selecting an output capacitor so that the minimum required amount of output capacitance is
provided over the full operating temperature range. Ceramic capacitors can exhibit large changes in capacitance
with temperature (see Capacitor Characteristics). The output capacitor must be located not more than 1 cm from
the output pin and returned to a clean analog ground.
8.2.2.1.3 Noise Bypass Capacitor
Connecting a 10-nF capacitor to the BYPASS pin significantly reduces noise on the regulator output. The
capacitor is connected directly to a high-impedance circuit in the bandgap reference.
Because this circuit has only a few microamperes flowing in it, any significant loading on this node will cause a
change in the regulated output voltage. For this reason, DC leakage current through the noise bypass capacitor
must never exceed 100 nA and must be kept as low as possible for best output voltage accuracy.
The types of capacitors best suited for the noise bypass capacitor are ceramic and film. High-quality ceramic
capacitors with either NPO or COG dielectric typically have very low leakage. 10-nF polypropolene and
polycarbonate film capacitors are available in small surface-mount packages and typically have extremely low
leakage current.
8.2.2.2 Capacitor Characteristics
The LP2985-N was designed to work with ceramic capacitors on the output to take advantage of the benefits
they offer: for capacitance values in the 2.2-µF to 4.7-µF range, ceramics are the least expensive and also have
the lowest ESR values (which makes them best for eliminating high-frequency noise). The ESR of a typical 2.2-
µF ceramic capacitor is in the range of 10 mΩto 20 mΩ, which easily meets the ESR limits required for stability
by the LP2985-N.
One disadvantage of ceramic capacitors is that their capacitance can vary with temperature. Most large value
ceramic capacitors (≥2.2 µF) are manufactured with the Z5U or Y5V temperature characteristic, which results in
the capacitance dropping by more than 50% as the temperature goes from 25°C to 85°C.
This could cause problems if a 2.2-µF capacitor were used on the output because it will drop down to
approximately 1 µF at high ambient temperatures (which could cause the LM2985 to oscillate). If Z5U or Y5V
capacitors are used on the output, a minimum capacitance value of 4.7 µF must be observed.
A better choice for temperature coefficient in ceramic capacitors is X7R, which holds the capacitance within
±15%. Unfortunately, the larger values of capacitance are not offered by all manufacturers in the X7R dielectric.
Tantalum capacitors are less desirable than ceramics for use as output capacitors because they are more
expensive when comparing equivalent capacitance and voltage ratings in the 1 µF to 4.7 µF range.
Another important consideration is that tantalum capacitors have higher ESR values than equivalent size
ceramics. This means that while it may be possible to find a Tantalum capacitor with an ESR value within the
stable range, it would have to be larger in capacitance (which means bigger and more costly) than a ceramic
capacitor with the same ESR value.
Note that the ESR of a typical tantalum will increase about 2:1 as the temperature goes from 25°C down to
−40°C, so some guard band must be allowed.
8.2.2.3 ON/OFF Input Operation
The LP2985-N is shut off by driving the ON/OFF input low, and turned on by pulling it high. If this feature is not to
be used, the ON/OFF input must be tied to VIN to keep the regulator output on at all times.
VIN VOUT
PNP
GND
SCHOTTKY DIODE
VIN VOUT
PNP
GND
18
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To assure proper operation, the signal source used to drive the ON/OFF input must be able to swing above and
below the specified turn-on/turn-off voltage thresholds listed in the Electrical Characteristics section under
VON/OFF. To prevent mis-operation, the turn-on (and turn-off) voltage signals applied to the ON/OFF input must
have a slew rate which is ≥40 mV/µs.
CAUTION
The regulator output voltage cannot be ensured if a slow-moving AC (or DC) signal is
applied that is in the range between the specified turn-on and turn-off voltages listed
under the electrical specification VON/OFF (see Electrical Characteristics).
8.2.2.4 Reverse Input-Output Voltage
The PNP power transistor used as the pass element in the LP2985-N has an inherent diode connected between
the regulator output and input. During normal operation (where the input voltage is higher than the output) this
diode is reverse-biased).
Figure 23. Reverse Current Path
Figure 24. Reverse Current Protection
However, if the output voltage is higher than the input voltage, this diode turns ON, and current flows into the
regulator OUT pin. In such cases, a parasitic SCR can latch, allowing a high current to flow into the IN pin and
out the ground (GND) pin, which can damage the device.
In any application where the voltage at the OUT pin may possibly be higher than the voltage at the IN pin, an
external Schottky diode must be connected from VIN to VOUT (cathode on VIN, anode on VOUT), to limit the
reverse voltage across the LP2985-N to 0.3 V (see Absolute Maximum Ratings).
8.2.2.5 Power Dissipation
Knowing the device power dissipation and proper sizing of the thermal plane connected to the tab or pad is
critical to ensuring reliable operation. Device power dissipation depends on input voltage, output voltage, and
load conditions and can be calculated with Equation 1.
PD(MAX) = (VIN(MAX) – VOUT)×IOUT(MAX) (1)
19
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Power dissipation can be minimized, and greater efficiency can be achieved, by using the lowest available
voltage drop option that would still be greater than the dropout voltage (VDO). However, keep in mind that higher
voltage drops result in better dynamic (that is, PSRR and transient) performance.
On the SOT-23 (DBV) package, the primary conduction path for heat is through the device leads to the PCB,
predominately device lead 2 (GND). TI recommends that the trace from lead 2 be extended under the package
body and connected to an internal ground plane with thermal vias.
The maximum allowable junction temperature (TJ(MAX)) determines maximum power dissipation allowed (PD(MAX))
for the device package.
Power dissipation and junction temperature are most often related by the junction-to-ambient thermal resistance
(RθJA) of the combined PCB and device package and the temperature of the ambient air (TA), according to
Equation 2 or Equation 3:
TJ(MAX) = TA(MAX) + (RθJA × PD(MAX)) (2)
PD(MAX) = (TJ(MAX) - TA(MAX)) / RθJA (3)
Unfortunately, this RθJA is highly dependent on the heat-spreading capability of the particular PCB design, and
therefore varies according to the total copper area, copper weight, and location of the planes. The RθJA recorded
in Thermal Information is determined by the specific EIA/JEDEC JESD51-7 standard for PCB and copper-
spreading area, and is to be used only as a relative measure of package thermal performance. For a well-
designed thermal layout, RθJA is actually the sum of the package junction-to-case (bottom) thermal resistance
(RθJCbot) plus the thermal resistance contribution by the PCB copper area acting as a heat sink.
8.2.2.6 Estimating Junction Temperature
The EIA/JEDEC standard recommends the use of psi (Ψ) thermal characteristics to estimate the junction
temperatures of surface mount devices on a typical PCB board application. These characteristics are not true
thermal resistance values, but rather package specific thermal characteristics that offer practical and relative
means of estimating junction temperatures. These psi metrics are determined to be significantly independent of
copper-spreading area. The key thermal characteristics (ΨJT and ΨJB) are given in Thermal Information and are
used in accordance with Equation 4 or Equation 5.
TJ(MAX) = TTOP + (ΨJT × PD(MAX))
where
• PD(MAX) is explained in Equation 1.
• TTOP is the temperature measured at the center-top of the device package. (4)
TJ(MAX) = TBOARD + (ΨJB × PD(MAX))
where
• PD(MAX) is explained in Equation 1.
• TBOARD is the PCB surface temperature measured 1-mm from the device package and centered on the
package edge. (5)
For more information about the thermal characteristics ΨJT and ΨJB, see Semiconductor and IC Package Thermal
Metrics, available for download at www.ti.com.
For more information about measuring TTOP and TBOARD, see Using New Thermal Metrics; and for more
information about the EIA/JEDEC JESD51 PCB used for validating RθJA, see Thermal Characteristics of Linear
and Logic Packages Using JEDEC PCB Designs. These application notes are available at www.ti.com.com.
20
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8.2.3 Application Curves
Figure 25. Short-Circuit Current Figure 26. Short-Circuit Current
Figure 27. Load Transient Response Figure 28. Load Transient Response
Figure 29. Load Transient Response Figure 30. Line Transient Response
21
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Figure 31. Line Transient Response Figure 32. Line Transient Response
Figure 33. Line Transient Response Figure 34. Line Transient Response
Figure 35. Turn-On Time Figure 36. Turnon Time
IN
GND
ON/OFF
OUT
BYPASS
Ground
VOUT
VIN
Input
Capacitor Output
Capacitor
Bypass
Capacitor
22
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Figure 37. Turnon Time Figure 38. Turnon Time
9 Power Supply Recommendations
The LP2985-N is designed to operate from an input voltage supply range between VIN of 2.5 V and 16 V.
(Recommended minimum VIN is the greater of 3.1 V or VOUT(max) + rated dropout voltage (max) for operating load
current.) The input voltage range provides adequate headroom in order for the device to have a regulated output.
This input supply must be well regulated. If the input supply is noisy, additional input capacitors with low ESR can
help to improve the output noise performance.
10 Layout
10.1 Layout Guidelines
For best overall performance, place all circuit components on the same side of the circuit board and as near as
practical to the respective LDO pin connections. Place ground return connections to the input and output
capacitor, and to the LDO ground pin as close as possible to each other, connected by a wide, component-side,
copper surface. The use of vias and long traces to create LDO circuit connections is strongly discouraged and
negatively affects system performance. This grounding and layout scheme minimizes inductive parasitics, and
thereby reduces load-current transients, minimizes noise, and increases circuit stability.
A ground reference plane is also recommended and is either embedded in the PCB itself or located on the
bottom side of the PCB opposite the components. This reference plane serves to assure accuracy of the output
voltage, shield noise, and behaves similar to a thermal plane to spread (or sink) heat from the LDO device. In
most applications, this ground plane is necessary to meet thermal requirements.
10.2 Layout Example
Figure 39. LP2985 SOT-23 Package Typical Layout
23
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11 Device and Documentation Support
11.1 Documentation Support
11.1.1 Related Documentation
•Semiconductor and IC Package Thermal Metrics
•Using New Thermal Metrics
•Thermal Characteristics of Linear and Logic Packages Using JEDEC PCB Designs
11.2 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.3 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.4 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.5 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
11.6 Glossary
SLYZ022 —TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
TAPE AND REEL INFORMATION
*All dimensions are nominal
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LP2985AIM5-2.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-2.7/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-2.8 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-2.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-2.9/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.0 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.1/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.3 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.3/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.6 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.6/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-3.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-4.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-4.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-5.0 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-5.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5-5.7/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 16-Aug-2018
Pack Materials-Page 1
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LP2985AIM5-6.1/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-2.5/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-2.6/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-2.8/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-2.9/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-3.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-3.1/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-3.3/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-3.6/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-3.8/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-4.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-4.5/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-5.0 SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-5.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985AIM5X-6.1/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-2.5 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-2.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-2.7/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-2.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-2.9/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.1/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.2/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.3 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.3/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.6/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-3.8/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-4.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-4.5/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-5.0 SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-5.0/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-5.7/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5-6.1/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-2.5/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-2.7/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-2.8/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-3.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-3.3/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-3.6/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-4.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-4.5/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
LP2985IM5X-5.0 SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
PACKAGE MATERIALS INFORMATION
www.ti.com 16-Aug-2018
Pack Materials-Page 2
Device Package
Type Package
Drawing Pins SPQ Reel
Diameter
(mm)
Reel
Width
W1 (mm)
A0
(mm) B0
(mm) K0
(mm) P1
(mm) W
(mm) Pin1
Quadrant
LP2985IM5X-5.0/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3
*All dimensions are nominal
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP2985AIM5-2.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-2.7/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-2.8 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-2.8/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-2.9/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.0 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.1/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.3 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.3/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.6 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.6/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-3.8/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-4.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-4.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-5.0 SOT-23 DBV 5 1000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 16-Aug-2018
Pack Materials-Page 3
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP2985AIM5-5.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-5.7/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5-6.1/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985AIM5X-2.5/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-2.6/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-2.8/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-2.9/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-3.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-3.1/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-3.3/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-3.6/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-3.8/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-4.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-4.5/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-5.0 SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-5.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985AIM5X-6.1/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5-2.5 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-2.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-2.7/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-2.8/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-2.9/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.1/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.2/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.3 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.3/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.6/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-3.8/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-4.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-4.5/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-5.0 SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-5.0/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-5.7/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5-6.1/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0
LP2985IM5X-2.5/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-2.7/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-2.8/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-3.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-3.3/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-3.6/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-4.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-4.5/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 16-Aug-2018
Pack Materials-Page 4
Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm)
LP2985IM5X-5.0 SOT-23 DBV 5 3000 210.0 185.0 35.0
LP2985IM5X-5.0/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0
PACKAGE MATERIALS INFORMATION
www.ti.com 16-Aug-2018
Pack Materials-Page 5
www.ti.com
PACKAGE OUTLINE
C
TYP
0.22
0.08
0.25
3.0
2.6
2X 0.95
1.9
1.45 MAX
TYP
0.15
0.00
5X 0.5
0.3
TYP
0.6
0.3
TYP
8
0
1.9
A
3.05
2.75
B
1.75
1.45
(1.1)
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Refernce JEDEC MO-178.
0.2 C A B
1
34
5
2
INDEX AREA
PIN 1
GAGE PLANE
SEATING PLANE
0.1 C
SCALE 4.000
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ARROUND 0.07 MIN
ARROUND
5X (1.1)
5X (0.6)
(2.6)
(1.9)
2X (0.95)
(R0.05) TYP
4214839/C 04/2017
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:15X
PKG
1
34
5
2
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
SOLDER MASK
DEFINED
EXPOSED METAL
METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
EXPOSED METAL
www.ti.com
EXAMPLE STENCIL DESIGN
(2.6)
(1.9)
2X(0.95)
5X (1.1)
5X (0.6)
(R0.05) TYP
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE:15X
SYMM
PKG
1
34
5
2
www.ti.com
PACKAGE OUTLINE
C
TYP
0.22
0.08
0.25
3.0
2.6
2X 0.95
1.9
1.45 MAX
TYP
0.15
0.00
5X 0.5
0.3
TYP
0.6
0.3
TYP
8
0
1.9
A
3.05
2.75
B
1.75
1.45
(1.1)
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES:
1. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing
per ASME Y14.5M.
2. This drawing is subject to change without notice.
3. Refernce JEDEC MO-178.
0.2 C A B
1
34
5
2
INDEX AREA
PIN 1
GAGE PLANE
SEATING PLANE
0.1 C
SCALE 4.000
www.ti.com
EXAMPLE BOARD LAYOUT
0.07 MAX
ARROUND 0.07 MIN
ARROUND
5X (1.1)
5X (0.6)
(2.6)
(1.9)
2X (0.95)
(R0.05) TYP
4214839/C 04/2017
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
NOTES: (continued)
4. Publication IPC-7351 may have alternate designs.
5. Solder mask tolerances between and around signal pads can vary based on board fabrication site.
SYMM
LAND PATTERN EXAMPLE
EXPOSED METAL SHOWN
SCALE:15X
PKG
1
34
5
2
SOLDER MASK
OPENING
METAL UNDER
SOLDER MASK
SOLDER MASK
DEFINED
EXPOSED METAL
METAL
SOLDER MASK
OPENING
NON SOLDER MASK
DEFINED
(PREFERRED)
SOLDER MASK DETAILS
EXPOSED METAL
www.ti.com
EXAMPLE STENCIL DESIGN
(2.6)
(1.9)
2X(0.95)
5X (1.1)
5X (0.6)
(R0.05) TYP
SOT-23 - 1.45 mm max heightDBV0005A
SMALL OUTLINE TRANSISTOR
4214839/C 04/2017
NOTES: (continued)
6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate
design recommendations.
7. Board assembly site may have different recommendations for stencil design.
SOLDER PASTE EXAMPLE
BASED ON 0.125 mm THICK STENCIL
SCALE:15X
SYMM
PKG
1
34
5
2
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Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Texas Instruments:
LP2985AIM5-2.5/NOPB LP2985AIM5-2.7/NOPB LP2985AIM5-2.8 LP2985AIM5-2.8/NOPB LP2985AIM5-2.9/NOPB
LP2985AIM5-3.0 LP2985AIM5-3.0/NOPB LP2985AIM5-3.1/NOPB LP2985AIM5-3.3 LP2985AIM5-3.3/NOPB
LP2985AIM5-3.6 LP2985AIM5-3.6/NOPB LP2985AIM5-3.8/NOPB LP2985AIM5-4.0 LP2985AIM5-4.0/NOPB
LP2985AIM5-4.5 LP2985AIM5-4.5/NOPB LP2985AIM5-5.0 LP2985AIM5-5.0/NOPB LP2985AIM5-6.1/NOPB
LP2985AIM5X-2.5 LP2985AIM5X-2.5/NOPB LP2985AIM5X-2.6/NOPB LP2985AIM5X-2.7/NOPB LP2985AIM5X-
2.8/NOPB LP2985AIM5X-2.9/NOPB LP2985AIM5X-3.0 LP2985AIM5X-3.0/NOPB LP2985AIM5X-3.1/NOPB
LP2985AIM5X-3.3 LP2985AIM5X-3.3/NOPB LP2985AIM5X-3.6/NOPB LP2985AIM5X-3.8/NOPB LP2985AIM5X-
4.0/NOPB LP2985AIM5X-4.5/NOPB LP2985AIM5X-5.0 LP2985AIM5X-5.0/NOPB LP2985AIM5X-6.1/NOPB
LP2985AITL-3.3/NOPB LP2985AITLX-3.3/NOPB LP2985AITP-2.6/NOPB LP2985AITP-2.7/NOPB LP2985AITP-
2.8/NOPB LP2985AITP-2.9/NOPB LP2985AITP-3.0/NOPB LP2985AITP-3.3/NOPB LP2985AITP-5.0/NOPB
LP2985AITPX-2.5/NOPB LP2985AITPX-2.6/NOPB LP2985AITPX-2.7/NOPB LP2985AITPX-2.8/NOPB
LP2985AITPX-2.9/NOPB LP2985AITPX-3.0/NOPB LP2985AITPX-3.3/NOPB LP2985AITPX-5.0/NOPB LP2985IM5-
2.5 LP2985IM5-2.5/NOPB LP2985IM5-2.7/NOPB LP2985IM5-2.8/NOPB LP2985IM5-2.9/NOPB LP2985IM5-
3.0/NOPB LP2985IM5-3.1/NOPB LP2985IM5-3.2/NOPB LP2985IM5-3.3 LP2985IM5-3.3/NOPB LP2985IM5-
3.5/NOPB LP2985IM5-3.6 LP2985IM5-3.6/NOPB LP2985IM5-3.8 LP2985IM5-3.8/NOPB LP2985IM5-4.0/NOPB
LP2985IM5-4.5/NOPB LP2985IM5-5.0 LP2985IM5-5.0/NOPB LP2985IM5-6.1/NOPB LP2985IM5X-2.5/NOPB
LP2985IM5X-2.7/NOPB LP2985IM5X-2.8/NOPB LP2985IM5X-2.9/NOPB LP2985IM5X-3.0 LP2985IM5X-3.0/NOPB
LP2985IM5X-3.1/NOPB LP2985IM5X-3.3/NOPB LP2985IM5X-3.6/NOPB LP2985IM5X-3.8/NOPB LP2985IM5X-
4.0/NOPB LP2985IM5X-4.5/NOPB LP2985IM5X-5.0 LP2985IM5X-5.0/NOPB LP2985IM5X-6.1/NOPB LP2985ITL-
3.3/NOPB LP2985ITLX-3.3/NOPB LP2985ITP-2.5/NOPB LP2985ITP-2.6/NOPB LP2985ITP-2.7/NOPB LP2985ITP-
2.8/NOPB LP2985ITP-2.9/NOPB LP2985ITP-3.0/NOPB LP2985ITP-3.3/NOPB LP2985ITP-5.0/NOPB