19-0629; Rev 1; 1/07
MAX8840/MAX8841/
MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
General Description
The MAX8840/MAX8841/MAX8842 ultra-low-noise, low-
dropout (LDO) linear regulators are designed to deliver
up to 150mA continuous output current. These regula-
tors achieve a low 120mV dropout for 120mA load cur-
rent. The MAX8840 uses an advanced architecture to
achieve ultra-low output voltage noise of 11µVRMS and
PSRR of 54dB at 100kHz.
The MAX8841 does not require a bypass capacitor,
hence achieving the smallest PC board area. The
MAX8842 output voltage can be adjusted with an exter-
nal divider.
The MAX8840/MAX8841 are preset to a variety of volt-
ages in the 1.5V to 4.5V range. Designed with a p-channel
MOSFET series pass transistor, the MAX8840/MAX8841/
MAX8842 maintain very low ground current (40µA).
The regulators are designed and optimized to work with
low-value, low-cost ceramic capacitors. The MAX8840
requires only 1µF (typ) of output capacitance for stability
with any load. When disabled, current consumption drops
to below 1µA.
The MAX8840/MAX8841/MAX8842 are available in a tiny
1.0mm x 1.5mm x 0.8mm µDFN.
Applications
Cellular and Cordless Phones
PDA and Palmtop Computers
Base Stations
Bluetooth Portable Radios and Accessories
Wireless LANs
Digital Cameras
Personal Stereos
Portable and Battery-Powered Equipment
Features
oSpace-Saving 1.0mm x 1.5mm x 0.8mm µDFN
o11µVRMS Output Noise at 100Hz to 100kHz
Bandwidth (MAX8840)
o78dB PSRR at 1kHz (MAX8840)
o120mV Dropout at 120mA Load
oStable with 1µF Ceramic Capacitor for Any Load
oGuaranteed 150mA Output
oOnly Need Input and Output Capacitors (MAX8841)
oOutput Voltages: 1.5V, 1.8V, 2.5V, 2.6V, 2.7V, 2.8V,
2.85V, 3V, 3.3V, 4.5V (MAX8840/MAX8841) and
Adjustable (MAX8842)
oLow 40µA Ground Current
oExcellent Load/Line Transient
oOvercurrent and Thermal Protection
µDFN
(1.5mm x 1.0mm)
TOP VIEW
GND
BP (MAX8840)
N.C. (MAX8841)
FB (MAX8842)
SHDN
1
2
3
6
4
OUT
5N.C.
IN
MAX8840
MAX8841
MAX8842
Pin Configuration
Ordering Information
MAX8840
OUTPUT PRESET
1.5V TO 4.5V
IN
INPUT
2V TO 6V
OFF SHDN
CBP
10nF
COUT
1µF
CIN
1µF
OUT
ON
BP
GND
Typical Operating Circuits
*
xy is the output voltage code (see the Output Voltage Selector
Guide). Other versions between 1.5V and 4.5V are available in
100mV increments. Contact factory for other versions.
+
Denotes lead-free package.
PART* TEMP RANGE PIN-PACKAGE
MAX8840ELTxy+T -40°C to +85°C 6 µDFN-6
1.5mm x 1.0mm
MAX8841ELTxy+T -40°C to +85°C 6 µDFN-6
1.5mm x 1.0mm
MAX8842ELT+T -40°C to +85°C 6 µDFN-6
1.5mm x 1.0mm
Typical Operating Circuits continued at end of data sheet.
Output Voltage Selector Guide appears at end of data sheet.
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
2Maxim Integrated
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = VOUT + 0.5V, TA = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C;
the MAX8842 is tested with 2.45V output, unless otherwise noted.) (Note 1)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN to GND .................................................................-0.3V to +7V
Output Short-Circuit Duration ............................................Infinite
OUT, SHDN to GND ......................................-0.3V to (IN + 0.3V)
FB, BP, N.C. to GND..................................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (TA= +70°C)
6-Pin µDFN (derate 2.1mW/°C above +70°C) .............0.168W
θJA..................................................................................477°C/W
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Voltage Range VIN 26V
IOUT = 1mA, TA = +25°C -1 +1
IOUT = 100µA to 80mA, TA = +25°C -2 +2Output Voltage Accuracy
IOUT = 100µA to 80mA -3 +3
%
Maximum Output Current IOUT 150 mA
Current Limit ILIM OUT = 90% of nominal value 150 200 300 mA
VOUT ≥ 3V, IOUT = 80mA 80 170
VOUT ≥ 3V, IOUT = 120mA 120
2.5V ≤ VOUT < 3V, IOUT = 80mA 90 200
2.5V ≤ VOUT < 3V, IOUT = 120mA 135
2V ≤ VOUT < 2.5V, IOUT = 80mA 120 250
Dropout Voltage (Note 2)
2V ≤ VOUT < 2.5V, IOUT = 120mA 180
mV
IOUT = 0.05mA 40 90
Ground Current IQVIN = VOUT(nom) - 0.1V, IOUT = 0mA 220 500 µA
Line Regulation VLNR VIN = (VOUT + 0.5V) to 6V, IOUT = 0.1mA 0.001 %/V
Load Regulation VLDR IOUT = 1mA to 80mA 0.003 %/mA
TA = +25°C 0.003 1
Shutdown Supply Current ISHDN SHDN = 0V TA = +85°C 0.05 µA
MAX8840 78
f = 1kHz, IOUT = 10mA MAX8841/MAX8842 72
MAX8840 75
f = 10kHz, IOUT = 10mA MAX8841/MAX8842 65
MAX8840 54
Ripple Rejection PSRR
f = 100kHz, IOUT = 10mA MAX8841/ MAX8842 46
dB
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
3
Maxim Integrated
ELECTRICAL CHARACTERISTICS (continued)
(VIN = VOUT + 0.5V, TA = -40°C to +85°C, unless otherwise noted. CIN = 1µF, COUT = 1µF, CBP = 10nF. Typical values are at +25°C;
the MAX8842 is tested with 2.45V output, unless otherwise noted.) (Note 1)
Note 1: Limits are 100% tested at +25°C. Limits over operating temperature range are guaranteed by design.
Note 2: Dropout is defined as VIN - VOUT when VOUT is 100mV below the value of VOUT for VIN = VOUT + 0.5V.
Note 3: Time needed for VOUT to reach 90% of final value.
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
MAX8840 11
f = 100Hz to 100kHz,
ILOAD = 10mA MAX8841/MAX8842 230
MAX8840 13
Output Noise Voltage
(RMS) f = 100Hz to 100kHz,
ILOAD = 80mA MAX8841/MAX8842 230
µV
Shutdown Exit Delay RLOAD = 50Ω (Note 3) 300 µs
SHDN Logic-Low Level VIN = 2V to 6V 0.4 V
SHDN Logic-High Level VIN = 2V to 6V 1.5 V
TA = +25°C
SHDN Input Bias Current VIN = 6V, SHDN = 0V or
6V TA = +85°C 0.01 µA
TA = +25°C 0.006 0.1
FB Input Bias Current
(MAX8842) VIN = 6V, VFB = 1.3V TA = +85°C 0.01 µA
Thermal Shutdown 160 °C
Thermal-Shutdown
Hysteresis 10 °C
Typical Operating Characteristics
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA= +25°C, unless otherwise noted.)
MAX8840
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX8840 toc01
INPUT VOLTAGE (V)
OUTPUT VOLTAGE (V)
54321
0.5
1.0
1.5
2.0
2.5
3.0
3.5
0.0
06
IOUT = 150mA
IOUT = 0mA
MAX8840
OUTPUT VOLTAGE ACCURACY
vs. LOAD CURRENT
MAX8840 toc02
LOAD CURRENT (mA)
% DEVIATION (%)
125100755025
-0.4
-0.2
0
0.2
0.4
0.6
-0.6
0 150
MAX8840
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8840 toc03
TEMPERATURE (°C)
% DEVIATION (%)
603510-15
-0.8
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1.0
-1.0
-40 85
IOUT = 1mA
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
4Maxim Integrated
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA= +25°C, unless otherwise noted.)
MAX8440
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX8840 toc04
INPUT VOLTAGE (V)
DROPOUT VOLTAGE (mV)
125100755025
40
20
80
60
120
100
160
140
200
180
0
0150
TA = +85°C
TA = +25°C
TA = -40°C
MAX8840
DROPOUT VOLTAGE vs. OUTPUT VOLTAGE
MAX8840 toc05
OUTPUT (V)
DROPOUT VOLTAGE (mV)
3.02.82.62.42.2
50
100
150
200
250
0
2.0 3.2
IOUT = 80mA
MAX8840
GROUND PIN CURRENT vs. INPUT VOLTAGE
MAX8840 toc06
INPUT VOLTAGE (V)
GROUND PIN CURRENT (μA)
4321
150
200
50
100
250
300
350
0
05
ILOAD = 150mA
ILOAD = 0mA
MAX8840
GROUND PIN CURRENT vs. LOAD CURRENT
MAX8840 toc 07
LOAD CURRENT (mA)
GROUND PIN CURRENT (μA)
125100755025
100
50
150
200
250
300
350
0
0150
VIN = 3.8V
VIN = 5.5V
MAX8840
GROUND PIN CURRENT vs. TEMPERATURE
MAX8840 toc08
TEMPERATURE (°C)
GROUND PIN CURRENT (μA)
603510-15
35
40
45
50
30
-40 85
MAX8840
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8840 toc09
FREQUENCY (kHz)
PSRR (dB)
1 10 1000.1
40
50
60
10
20
30
70
80
90
0
0.01 1000
ILOAD = 10mA
CBP = 10nF
MAX8841
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX8840 toc10
FREQUENCY (kHz)
PSRR (dB)
0.1 1 10 100
40
50
60
10
20
30
70
80
90
0
0.01 1000
ILOAD = 10mA
MAX8840
OUTPUT NOISE
MAX8840 toc11
400μs/div
VIN = 3.8V
ILOAD = 10mA
VNOISE = 11μVRMS
20μV/div
MAX8840
OUTPUT NOISE-SPECTRAL DENSITY
vs. FREQUENCY
MAX8840 toc12
FREQUENCY (kHz)
OUTPUT NOISE DENSITY (nV/√Hz)
0.1 1 10 100
1000
100
10,000
10
0.01 1000
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
5
Maxim Integrated
Typical Operating Characteristics (continued)
(VIN = VOUT + 0.5V, CIN = 1µF, COUT = 1µF, CBP = 10nF, TA= +25°C, unless otherwise noted.)
MAX8840
OUTPUT NOISE vs. BP CAPACITANCE
MAX8840 toc13
BP CAPACITANCE (nF)
OUTPUT NOISE (μV)
10
5
10
15
20
25
0
1100
MAX8840
LOAD-TRANSIENT RESPONSE
MAX8840 toc14
1ms/div
VIN = 3.5V
ILOAD = 0 TO 50mA
VOUT
10mV/div
MAX8840
LOAD-TRANSIENT RESPONSE NEAR DROPOUT
MAX8840 toc15
1ms/div
VIN = 3.1V
ILOAD = 0 TO 50mA
VOUT
10mV/div
MAX8840
LINE-TRANSIENT RESPONSE
MAX8840 toc16
200μs/div
VIN = 3.5V TO 4V
VOUT
2mV/div
MAX8840
EXITING SHUTDOWN WAVEFORM
MAX8840 toc17
20μs/div
VOUT = 2.85V
RLOAD = 47Ω
OUTPUT
VOLTAGE
2V/div
SHUTDOWN
VOLTAGE
MAX8840
SHUTDOWN EXIT DELAY
MAX8840 toc19
20μs/div
SHUTDOWN
VOLTAGE
VOUT
1V/div
VOUT = 3V
CBP = 100nF
MAX8840
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
MAX8840 toc20
LOAD CURRENT (mA)
COUT ESR (Ω)
100755025
0.1
1
10
100
0.01
0 150125
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
6Maxim Integrated
Detailed Description
The MAX8840/MAX8841/MAX8842 are ultra-low-noise,
low-dropout, low-quiescent current linear regulators
designed for space-restricted applications. The parts
are available with preset output voltages ranging from
1.5V to 4.5V. These devices can supply loads up to
150mA. As shown in the
Functional Diagram
, the
MAX8840/MAX8841 consist of an innovative bandgap
core and noise bypass circuit, error amplifier, p-chan-
nel pass transistor, and internal feedback voltage-
divider. The MAX8842 allows for adjustable output with
an external feedback network.
The 1.225V bandgap reference is connected to the
error amplifier’s inverting input. The error amplifier com-
pares this reference with the feedback voltage and
amplifies the difference. If the feedback voltage is
lower than the reference voltage, the pass-transistor
gate is pulled low. This allows more current to pass to
the output and increases the output voltage. If the feed-
back voltage is too high, the pass transistor gate is
pulled high, allowing less current to pass to the output.
The output voltage is fed back through an internal resis-
tor voltage-divider connected to the OUT pin.
An external bypass capacitor connected to BP
(MAX8840) reduces noise at the output. Additional
blocks include a current limiter, thermal sensor, and
shutdown logic.
Internal p-Channel Pass Transistor
The MAX8840/MAX8841/MAX8842 feature a 1Ω(typ)
p-channel MOSFET pass transistor. This provides seve-
ral advantages over similar designs using a pnp pass
transistor, including longer battery life. The p-channel
MOSFET requires no base drive, which considerably
reduces quiescent current. pnp-based regulators waste
considerable current in dropout when the pass transis-
tor saturates. They also use high base-drive current
under heavy loads. The MAX8840/MAX8841/MAX8842
do not suffer from these problems and consume only
40µA of quiescent current in light load and 220µA in
dropout (see the
Typical Operating Characteristics
).
Output Voltage Selection
The MAX8840/MAX8841 are supplied with factory-set
output voltages from 1.5V to 4.5V, in 100mV increments
(see the
Ordering Information
). The MAX8842 features
a user-adjustable output through an external feedback
network (see the
Typical Operating Circuits
).
To set the output of the MAX8842, use the following
equation:
where R2 is chosen to be less than 240kΩand VREF =
1.225V. Use 1% or better resistors.
Shutdown
The MAX8840/MAX8841/MAX8842 feature a low-power
shutdown mode that reduces quiescent current less
than 1µA. Driving SHDN low disables the voltage refer-
ence, error amplifier, gate-drive circuitry, and pass
transistor (see the
Functional Diagram
), and the device
output enters a high-impedance state. Connect SHDN
to IN for normal operation.
Current Limit
The MAX8840/MAX8841/MAX8842 include a current
limiter, which monitors and controls the pass transis-
tor’s gate voltage, limiting the output current to 200mA.
RRX
V
V
OUT
REF
12 1=⎛
⎝
⎜⎞
⎠
⎟
-
Pin Description
PIN
MAX8840 MAX8841 MAX8842 NAME FUNCTION
1 1 1 IN Unregulated Input Supply
2 2 2 GND Ground
333SHDN Shutdown. Pull low to disable the regulator.
4——BP
Noise Bypass for Low-Noise Operation. Connect a 10nF capacitor
from BP to OUT. It is shorted to OUT in shutdown mode.
— — 4 FB Adjustable Output Feedback Point
5 4, 5 5 N.C. No Connection. Not internally connected.
666OUT
Regulated Output Voltage. Bypass with a capacitor to GND. See the
Capacitor Selection and Regulator Stability section.
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
7
Maxim Integrated
For design purposes, consider the current limit to be
150mA (min) to 300mA (max). The output can be shorted
to ground for an indefinite amount of time without dam-
aging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipation
in the MAX8840/MAX8841/MAX8842. When the junction
temperature exceeds TJ= +160°C, the thermal sensor
signals the shutdown logic, turning off the pass transistor
and allowing the IC to cool down. The thermal sensor
turns the pass transistor on again after the IC’s junction
temperature drops by 10°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX8840/MAX8841/MAX8842 in the event of a fault
condition. For continual operation, do not exceed the
absolute maximum junction temperature rating of TJ =
+150°C.
Operating Region and Power Dissipation
The MAX8840/MAX8841/MAX8842 maximum power
dissipation depends on the thermal resistance of the
case and circuit board, the temperature difference
between the die junction and ambient, and the rate of
airflow. The power dissipation across the device is:
P = IOUT (VIN - VOUT)
The maximum power dissipation is:
PMAX = (TJ- TA) / (θJC + θCA)
where TJ- TAis the temperature difference between
the MAX8840/MAX8841/MAX8842 die junction and the
surrounding air, θJC is the thermal resistance of the
package, and θCA is the thermal resistance through the
PC board, copper traces, and other materials to the
surrounding air.
The GND pin of the MAX8840/MAX8841/MAX8842 per-
forms the dual function of providing an electrical con-
nection to ground and channeling heat away. Connect
the GND pin to ground using a large pad or ground
plane.
Noise Reduction
For the MAX8840, an external 0.01µF bypass capacitor
between BP and OUT with an innovative noise bypass
scheme reduces output noises dramatically, exhibiting
11µVRMS of output voltage noise with CBP = 0.01µF
and COUT = 1µF. Startup time is minimized by a power-
on circuit that precharges the bypass capacitor.
Applications Information
Capacitor Selection
and Regulator Stability
Use a 1µF capacitor on the MAX8840/MAX8841/
MAX8842 input and a 1µF capacitor on the output.
Larger input capacitor values and lower ESRs provide
better noise rejection and line-transient response.
Reduce output noise and improve load-transient
response, stability, and power-supply rejection by
using large output capacitors. Note that some ceramic
dielectrics exhibit large capacitance and ESR variation
with temperature. With dielectrics such as Z5U and
Y5V, it may be necessary to use a 2.2µF or larger output
capacitor to ensure stability at temperatures below
-10°C. With X7R or X5R dielectrics, 1µF is sufficient at all
operating temperatures. A graph of the Region of Stable
COUT ESR vs. Load Current is shown in the
Typical
Operating Characteristics
.
Use a 0.01µF bypass capacitor at BP (MAX8840) for
low-output voltage noise. The leakage current going into
the BP pin should be less than 10nA. Increasing the
capacitance slightly decreases the output noise. Values
above 0.1µF and below 0.001µF are not recommended.
Noise, PSRR, and Transient Response
The MAX8840/MAX8841/MAX8842 are designed to
deliver ultra-low noise and high PSRR, as well as low
dropout and low quiescent currents in battery-powered
systems. The MAX8840 power-supply rejection is 78dB
at 1kHz and 54dB at 100kHz. The MAX8841/MAX8842
PSRR is 72dB at 1kHz and 46dB at 100kHz (see the
Power-Supply Rejection Ratio vs. Frequency graph in
the
Typical Operating Characteristics)
.
When operating from sources other than batteries,
improved supply-noise rejection and transient response
can be achieved by increasing the values of the input
and output bypass capacitors, and through passive fil-
tering techniques. The
Typical Operating Characteristics
show the MAX8840/MAX8841/MAX8842 line- and load-
transient responses.
Dropout Voltage
A regulator’s minimum dropout voltage determines the
lowest usable supply voltage. In battery-powered sys-
tems, this determines the useful end-of-life battery volt-
age. Because the MAX8840/MAX8841/MAX8842 use a
p-channel MOSFET pass transistor, their dropout voltage
is a function of drain-to-source on-resistance (RDS(ON))
multiplied by the load current (see the
Typical Ope-
rating Characteristics
).
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
8Maxim Integrated
P
OUT
FB***
*MAX8840 ONLY
**MAX8840/MAX8841 ONLY
***MAX8842 ONLY
**
**
BP*
MAX8840
MAX8841
MAX8842
ERROR
AMP
IN
SHDN
GND
SHUTDOWN AND
POWER-ON CONTROL
THERMAL
SENSOR
MOS DRIVER
WITH ILIMIT
1.225V REFERENCE
AND NOISE BYPASS
Functional Diagram
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
9
Maxim Integrated
Revision History
Pages changed at Rev 1: 1
Chip Information
TRANSISTOR COUNT: 284
PROCESS: BiCMOS
MAX8841
OUTPUT PRESET
1.5V TO 4.5V
IN
INPUT
2V TO 6V
OFF SHDN COUT
1µF
CIN
1µF
OUT
ON
GND
Typical Operating
Circuits (continued)
Output Voltage Selector Guide
PART VOUT (V) TOPMARK
MAX8840ELT16+T 1.6 MN
MAX8840ELT18+T 1.8 MO
MAX8840ELT19+T 1.9 LX
MAX8840ELT25+T 2.5 MP
MAX8840ELT26+T 2.6 MK
MAX8840ELT27+T 2.7 LU
MAX8840ELT28+T 2.8 LV
MAX8840ELT29+T 2.85 LW
MAX8840ELT30+T 3 LZ
MAX8840ELT31+T 3.1 ML
MAX8840ELT33+T 3.3 MM
MAX8841ELT15+T 1.5 MQ
MAX8841ELT18+T 1.8 MR
MAX8841ELT25+T 2.5 MS
MAX8841ELT26+T 2.6 MT
MAX8841ELT28+T 2.8 MU
MAX8841ELT29+T 2.85 MV
MAX8841ELT89+T 2.9 MW
MAX8841ELT31+T 3.1 MX
MAX8841ELT33+T 3.3 MY
MAX8841ELT45+T 4.5 MZ
MAX8842ELT+T Adjustable NA
MAX8842
OUTPUT ADJUSTABLE
1.5V TO 4.5V
IN
INPUT
2V TO 6V
OFF SHDN
R1
R2
COUT
1µF
CIN
1µF
OUT
ON FB
GND
(Note: Standard output voltage options, shown in bold, are
available. Contact the factory for other output voltages between
1.5V and 4.5V. Minimum order quantity is 15,000 units.)
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
10 Maxim Integrated
L
TOP VIEW
D
E
SIDE VIEW
A1
A
A0.65
COMMON DIMENSIONS
PIN 1
0.075x45∞
BOTTOM VIEW
L1
32
MIN.
1
e
6
5
b
4
SECTION A-A
b
L2
A A
NOM.
0.72 0.80
MAX.
0.00
A1
0.05
1.501.45D 1.55
1.000.95E 1.05
0.350.30L 0.40
--0.00
L1 0.08
--0.05L2 0.10
0.200.17b 0.23
0.50 BSC.e
AA
TOPMARK
2
1
-DRAWING NOT TO SCALE-
DOCUMENT CONTROL NO.APPROVAL
TITLE:
REV.
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
21-0147 2
1
E
3
PIN 1
MARK
4
5
L611-1, L611-2
Pkg.
Code
--
--
A2
0.20 --
A2
6L UDFN.EPS
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent
licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and
max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 ________________________________
11
© 2007 Maxim Integrated Products, Inc. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
MAX8840/MAX8841/MAX8842
Ultra-Low-Noise, High PSRR, Low-Dropout,
150mA Linear Regulators in µDFN
-DRAWING NOT TO SCALE-
DOCUMENT CONTROL NO.APPROVAL
TITLE:
REV.
PACKAGE OUTLINE, 6L uDFN, 1.5x1.0x0.8mm
21-0147 2
2
E
2005 2006 2007 2008 2009 2010 2011 2012 2013 2014Calendar Year
Legend: Marked with bar Blank space - no bar required
06-11Payweek 12-17 18-23 24-29 30-35 36-41 42-47 48-51 52-05
TABLE 2 Translation Table for Payweek Binary Coding
TABLE 1 Translation Table for Calendar Year Code
Legend: Marked with bar Blank space - no bar required
Package Information (continued)
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or
“-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the
package regardless of RoHS status.
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MAX8840ELTXY+T MAX8841ELTXY+T MAX8840ELT15+T MAX8840ELT18+T MAX8840ELT19+T
MAX8840ELT27+T MAX8840ELT28+T MAX8840ELT29+T MAX8840ELT33+T MAX8840ELT40+T
MAX8840ELT45+T MAX8840ELT45+TG65 MAX8841ELT18+T MAX8841ELT25+T MAX8841ELT33+T
MAX8842ELT+T MAX8840ELT30+T MAX8841ELT15+T MAX8840EYT27+G65 MAX8840ELT16+T
MAX8840ELT21+T MAX8840EYT27+ MAX8840EYT27+TG65 MAX8841ELT29+T MAX8840EYT27+T