General Description
The MAX8882/MAX8883 dual, low-noise, low-dropout
linear regulators operate from a +2.5V to +6.5V input
and deliver up to 160mA each of continuous current.
Both versions offer low output noise and low dropout of
only 72mV at 80mA. Designed with an internal P-
channel MOSFET pass transistor, the MAX8882/
MAX8883 maintain a low 165µA supply current (both
LDOs on), independent of the load current and dropout
voltage. Other features include short-circuit protection
and thermal-shutdown protection. The MAX8882 has a
single shutdown input and provides an external refer-
ence bypass pin to improve noise performance. The
MAX8883 includes two independent logic-controlled
shutdown inputs. The MAX8882/MAX8883 are both
available in a miniature 6-pin SOT23 package.
________________________Applications
µP/DSP Core/IO Power
Cellular and PCS Telephones
PDAs and Palmtop Computers
Notebook Computers
Digital Cameras
Hand-Held Instruments
Features
♦Two LDOs in Tiny SOT23
♦Up to 160mA Output Current (each LDO)
♦40µVRMS Output Noise (MAX8882)
♦72mV Dropout at 80mA Load
♦Low 165µA Operating Supply Current
♦62dB PSRR (greater than 56dB to 100kHz)
♦Independent Low-Power Shutdown Controls
(MAX8883)
♦Thermal-Overload and Short-Circuit Protection
♦Output Current Limit
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
________________________________________________________________ Maxim Integrated Products 1
GND
SHDNBP
16OUTA
5IN
OUTB
MAX8882
SOT23-6
TOP VIEW
2
34
Pin Configurations
19-1818; Rev 1; 10/01
Ordering Information
Typical Operating Circuit
PART SH UT-
DO WN
TEMP
RANGE
PIN-
PACKAGE
MAX8882EUT_ _* Single -40°C to +85°C 6 SOT23-6
MAX8883EUT_ _* Dual -40°C to +85°C 6 SOT23-6
PART VOUTA VOUTB TOP MARK
MAX8882EUTJJ 2.85 2.85 AANR
MAX8882EUTAQ 3.3 2.5 AAPW
MAX8882EUTA5 3.3 1.8 AARY
MAX8882EUTQ5 2.5 1.8 AAPX
MAX8882EUTGG 3.0 3.0 AAZT
MAX8883EUTJJ 2.85 2.85 AANS
MAX8883EUTAQ 3.3 2.5 AAPY
MAX8883EUTA5 3.3 1.8 AARZ
MAX8883EUTQ5 2.5 1.8 AAPZ
MAX8883EUTGG 3.0 3.0 AAZU
Selector Guide
2.2µF
2.2µF
VIN
2.5V to 6.5V
VOUTA
FIXED
(1.8V to 3.3V)
OUTA
OUTB
(BP)
MAX8882
MAX8883
GND
2.2µF
VOUTB
FIXED
(1.8V to 3.3V)
0.01µF
( ) ARE FOR MAX8882 ONLY.
SHDN_
IN
Pin Configurations continued at end of data sheet.
***Other combinations between 1.8V and 3.3V are available in
100mV increments. Contact factory for other versions.
Minimum order quantity is 50,000 units.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
*See Selector Guide
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN = +3.6V, SHDN = SHDNA = SHDNB = IN, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (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, SHDN, SHDNA, SHDNB, BP to GND...............-0.3V to +7.0V
OUTA, OUTB to GND ..................................-0.3V to (VIN + 0.3V)
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW
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 CONDITIONS MIN TYP MAX UNITS
Input Voltage 2.5 6.5 V
Undervoltage Lockout
Threshold VIN_ rising, hysteresis 40mV typical 2.15 2.25 2.40 V
TA = +25°C, IOUT_ = 1mA -1 1
IOUT_ = 1mA -2 2Output Voltage Accuracy
IOUT_ = 100µA to 160mA -3 2
%
Maximum Output Current Continuous 160 mA
Current Limit 160 550 mA
No Load, VIN = 6.5V 165 265
Ground Current IOUT_ = 80mA, both LDOs 170 µA
SHDN_ = GND, TA = +25°C 0.01 1
Shutdown Supply Current SHDN_ = GND 0.1 µA
VIH 1.6
SHDN_ Input Threshold VIL 0.4 V
SHDN_ = GND or IN, TA = +25°C 0 100
SHDN_ Input Bias Current SHDN_ = GND or IN 0.05 nA
IOUT_ = 1mA 1
IOUT_ = 40mA 36
Dropout Voltage
(Notes 2, 3) IOUT_ = 80mA 72 144
mV
Line Regulation VIN = (VOUT_ + 0.4V or 2.5V) to + 6.5V,
IOUT_ = 1mA -0.2 0 0.2 %/V
10Hz to 100kHz, CBP = 0.01µF, COUT_ = 4.7µF,
IOUT_ = 1mA MAX8882 40
Output Voltage Noise
10Hz to 100kHz, COUT_ = 4.7µF, IOUT_ = 10mA MAX8883 320
µVRMS
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
_______________________________________________________________________________________ 3
0
50
150
100
200
250
01 234 56
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX8882/3 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (µA)
NO LOAD
80mA LOAD, BOTH OUTPUTS
0
40
20
80
60
120
100
140
180
160
200
0203010 40 50 60 70 80
SUPPLY CURRENT
vs. LOAD CURRENT
MAX8882/3 toc02
LOAD CURRENT (mA)
SUPPLY CURRENT (µA)
BOTH OUTPUTS LOADED
0
60
40
20
80
100
120
140
160
180
200
-40 10-15 35 60 85
SUPPLY CURRENT
vs. TEMPERATURE
MAX8882/3 toc03
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
80mA LOAD, BOTH OUTPUTS
0
15
30
45
60
75
90
02010 30 40 50 60 70 80
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8882/3 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
TA = +25°C
TA = +85°C
TA = -40°C
0
60
40
20
80
100
120
140
160
180
200
2.5 2.7 2.9 3.1 3.3
DROPOUT vs. VOUT
MAX8882/83 toc05
VOUT (V)
DROPOUT (mV)
GUARANTEED MAXIMUM
MEAN
-1.0
-0.6
-0.8
-0.2
-0.4
0.2
0
0.4
0.8
0.6
1.0
-40 -10 5-25 20 35 50 65 80
OUTPUT VOLTAGE ACCURACY
vs. TEMPERATURE
MAX8882/83 toc06
TEMPERATURE (°C)
OUTPUT VOLTAGE (%)
Typical Operating Characteristics
(VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2µF, CBP = 0.01µF, and CIN = 2.2µF, unless otherwise noted.)
Note 1: All units are 100% production tested at TA= +25°C. Limits over the operating temperature range are
guaranteed by design.
Note 2: The dropout voltage is defined as VIN - VOUT when VIN = VOUT (NOM). Specification only applies when VOUT ≥2.5V.
Note 3: See the Typical Operating Characteristics for guaranteed specifications at voltages other than 3.3V.
PARAMETER CONDITIONS
MIN TYP MAX
UNITS
100Hz, CBP = 0.01µF, COUT_ = 4.7µF MAX8882 62
Output Voltage AC PSRR
100Hz, COUT_ = 4.7µF MAX8883 60
dB
Thermal Shutdown
Temperature
160
°C
Thermal Shutdown
Hysteresis 10 °C
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +3.6V, SHDN = SHDNA = SHDNB = IN, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
4 _______________________________________________________________________________________
Typical Operating Characteristics (continued)
(VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2µF, CBP = 0.01µF, and CIN = 2.2µF, unless otherwise noted.)
MAX8882 OUTPUT NOISE
(10Hz to 100kHz)
MAX8882/3 toc10
1ms/div
500µV/div
(AC-COUPLED)
VOUT_
LINE TRANSIENT
MAX8882/3 toc11
50µs/div
VIN
VOUT_
4.5V
3.5V
1V/div
20mV/div
(AC-COUPLED)
LOAD TRANSIENT
(VIN = 3.35V, ILOAD = 0 TO 80mA)
MAX8882/3 toc12
10µs/div
VOUT_
ILOAD
0
20mV/div
(AC-COUPLED)
50mA/div
0
20
10
40
30
60
50
70
0.01 10.1 10 100 1000
PSRR vs. FREQUENCY
MAX8882/3 toc07
FREQUENCY (kHz)
PSRR (dB)
100Ω LOAD
0.01 0.1 1 1000
CHANNEL-TO-CHANNEL ISOLATION
vs. FREQUENCY
MAX8882/3 toc08
FREQUENCY (kHz)
CHANNEL-TO-CHANNEL ISOLATION (dB)
120
0
20
40
60
80
100
10 100
100Ω LOAD
THERMAL
COUPLING
CAPACITVE
COUPLING
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
_______________________________________________________________________________________ 5
Pin Description
LOAD TRANSIENT NEAR DROPOUT
MAX8882/3 toc13
10µs/div
20mV/div
0
50µA/div
VOUT
ILOAD
VIN = VOUT + 0.1V
SHUTDOWN RESPONSE
MAX8882/3 toc14
1ms/div
20V/div
OUTPUT
VOLTAGE
SHUTDOWN
VOLTAGE
0
0
1V/div
RLOAD = 100Ω
PIN
MAX8882 MAX8883 NAME FUNCTION
1 1 OUTB
Regulator B Output. Sources up to 160mA continuous current. Bypass with a
2.2µF (<0.5Ω typ ESR) capacitor to GND (see the Capacitor Selection and
Regulator Stability section).
2 2 GND Ground. This pin also functions as a heatsink. Solder to a large pad or the
circuit-board ground plane to maximize thermal dissipation.
3—BP Reference Noise Bypass. Bypass with a low-leakage 0.01µF ceramic
capacitor for reduced noise at both outputs.
—3SHDNA
Shutdown A Input. A logic low shuts down regulator A. If SHDNA and
SHDNB are both low, both regulators and the reference turn off, and supply
current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the
reference is on. Connect to IN for normal operation.
—4SHDNB
Shutdown B Input. A logic low shuts down regulator B. If SHDNA and
SHDNB are both low, both regulators and the reference turn off, and supply
current is reduced to 10nA. If either SHDNA or SHDNB is a logic high, the
reference is on. Connect to IN for normal operation.
4—SHDN
Shutdown Input. A logic low shuts down both regulators and the reference,
reducing the entire supply current to 10nA. Connect to IN for normal
operation.
55IN
Regulator Input. Supply voltage can range from +2.5V to +6.5V. This input
also supplies the on-chip reference. Bypass with 2.2µF to GND (see the
Capacitor Selection and Regulator Stability section).
6 6 OUTA
Regulator A Output. Sources up to 160mA continuous current. Bypass with
a 2.2µF (<0.5Ω typ ESR) capacitor to GND (see the Capacitor Selection and
Regulator Stability section).
Typical Operating Characteristics (continued)
(VOUT_ = 2.85V, IOUT_ = 80mA, VIN = +3.6V, COUT_ = 2.2µF, CBP = 0.01µF, and CIN = 2.2µF, unless otherwise noted.)
MAX8882/MAX8883
Detailed Description
The MAX8882/MAX8883 are low-noise, low-dropout,
low-quiescent-current linear regulators designed primar-
ily for battery-powered applications. These parts are
available with preset output voltages ranging from 1.8V
to 3.3V, and the parts can supply loads up to 160mA.
Shutdown
MAX8882
The MAX8882 has a single shutdown control input
(SHDN). Drive SHDN low to shut down both outputs,
reducing supply current to 10nA. Connect SHDN to a
logic-high, or IN, for normal operation.
MAX8883
The MAX8883 has independent shutdown control
inputs (SHDNA and SHDNB). Drive SHDNA low to shut
down OUTA. Drive SHDNB low to shut down OUTB.
Drive both SHDNA and SHDNB low to shut down the
entire chip, reducing supply current to 10nA. Connect
both SHDNA and SHDNB to a logic-high, or IN, for nor-
mal operation.
Internal P-Channel Pass Transistor
The MAX8882/MAX8883 feature two 1ΩP-channel
MOSFET pass transistors. A P-channel MOSFET pro-
vides several advantages over similar designs using
PNP pass transistors, including longer battery life. It
requires no base drive, which reduces quiescent cur-
rent significantly. PNP-based regulators waste consid-
erable current in dropout when the pass transistor
saturates, and they also use high base-drive currents
under large loads. The MAX8882/MAX8883 do not suf-
fer from these problems and only consume 165µA of
quiescent current whether in dropout, light-load, or
heavy-load applications (see the Typical Operating
Characteristics). While a PNP-based regulator has
dropout voltage that is independent of the load, a P-
channel MOSFET’s dropout voltage is proportional to
load current, providing for low dropout voltage at heavy
loads and extremely low dropout voltage at lighter
loads.
Current Limit
The MAX8882/MAX8883 contain two independent cur-
rent limiters, one for each regulator, which monitor and
control the pass transistor’s gate voltage, limiting the
guaranteed maximum output current to 160mA mini-
mum. The output can be shorted to ground for an indef-
inite time without damaging the part.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX8882/MAX8883. When the junction tem-
perature exceeds TJ= +160°C, the thermal sensor sig-
nals the shutdown logic, turning off the pass transistor
and allowing the IC to cool. The thermal sensor will turn
the pass transistor on again after the IC’s junction tem-
perature cools by 10°C, resulting in a pulsed output
during continuous thermal-overload conditions.
Thermal-overload protection is designed to protect the
MAX8882/MAX8883 in the event of fault conditions. For
continual operation, do not exceed the absolute maxi-
mum junction-temperature rating of TJ= +150°C.
Operating Region and Power Dissipation
The MAX8882/MAX8883’s maximum power dissipation
depends on the thermal resistance of the case and cir-
cuit board, the temperature difference between the die
junction and ambient air, and the rate of air flow. The
power dissipation across the device is P = IOUT (VIN -
VOUT) (Figure 1). The maximum power dissipation is:
PMAX = (TJ- TA) / (TJB + TBA)
where TJ- TAis the temperature difference between
the MAX8882/MAX8883 die junction and the surround-
ing air, TJB (or TJC) is the thermal resistance of the
package, and TBA is the thermal resistance through the
printed circuit board, copper traces, and other materi-
als to the surrounding air.
The GND pin of the MAX8882/MAX8883 performs the
dual functions of providing an electrical connection to
the ground and channeling heat away. Connect the
GND pin to ground using a large pad or ground plane.
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
6 _______________________________________________________________________________________
Figure 1. MAX8882/MAX8883 Safe Operating Region
0
40
20
100
80
60
160
140
120
180
021 345
SAFE OPERATING REGION
MAX8882/3 fig01
VIN - VOUT_ (V)
IOUT_ (mA)
+85°C
+70°C
Low-Noise Operation (MAX8882)
An external 0.01µF bypass capacitor at BP, in conjunc-
tion with an internal resistor, creates a lowpass filter.
The MAX8882 exhibits 40µVRMS of output voltage noise
with CBP = 0.01µF and COUT_ = 4.7µF. (See the Output
Noise Spectral Density graph in the Typical Operating
Characteristics.)
Applications Information
Capacitor Selection and
Regulator Stability
Use a 2.2µF capacitor on the MAX8882/MAX8883 input
and a 2.2µF capacitor on the outputs. Larger input
capacitor values and lower ESRs provide better supply-
noise rejection and line-transient response. To reduce
noise, improve load transients, and for loads up to
160mA, use larger output capacitors (up to 10µF). For
stable operation over the full temperature range and
with load currents up to 80mA, use 2.2µF.
Note that some ceramic dielectrics exhibit large capac-
itance and ESR variation with temperature. With
dielectrics such as Z5U and Y5V, it may be necessary
to use 4.7µF or more to ensure stability at temperatures
below -10°C. With X7R or X5R dielectrics, 2.2µF is suffi-
cient at all operating temperatures. These regulators
are optimized for ceramic capacitors, and tantalum
capacitors are not recommended.
Use a 0.01µF bypass capacitor at BP (MAX8882) for
low output voltage noise. Increasing the capacitance
will slightly decrease the output noise, but increase the
startup time. (See the Shutdown Response graph in the
Typical Operating Characteristics.)
PSRR and Operation from Sources
Other than Batteries
The MAX8882/MAX8883 are designed to deliver low
dropout voltages and low quiescent currents in battery-
powered systems. Power-supply rejection is 62dB at
low frequencies and rolls off above 100kHz. (See the
PSRR 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.
Dropout Voltage
A regulator’s minimum input-output voltage differential
(or dropout voltage) determines the lowest usable sup-
ply voltage. In battery-powered systems, this deter-
mines the useful end-of-life battery voltage. Because
the MAX8882/MAX8883 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 Operating Characteristics).
Chip Information
TRANSISTOR COUNT: 493
PROCESS: BiCMOS
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
_______________________________________________________________________________________ 7
TOP VIEW
GND
SHDNBSHDNA
16OUTA
5IN
OUTB
MAX8883
SOT23-6
2
34
Pin Configurations (continued)
MAX8882/MAX8883
Dual, Low-Noise, Low-Dropout, 160mA Linear
Regulators in SOT23
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8_____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
Package Information
6LSOT.EPS
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Maxim Integrated:
MAX8882EUTA5+T MAX8882EUTAQ+T MAX8882EUTJJ+T MAX8882EUT55+T MAX8882EUTGG+T
MAX8882EUTJ5+T MAX8883EUTA5+T MAX8883EUTJJ+T MAX8882EUTA5-T MAX8882EUTAQ-T
MAX8882EUTQ5-T MAX8883EUTA5-T MAX8883EUTJJ-T MAX8883EUTQ5-T MAX8883EUTGG-T
MAX8882EUTGG-T MAX8882EUTQ5+T MAX8883EUTAQ+T MAX8883EUTAQ+