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MAX8880EUT-T-MAX8881EUT18-T-MAX8881EUT25-T-MAX8881EUT50-T
12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POK
General DescriptionThe MAX8880/MAX8881 are ultra-low supply current,
low-dropout linear regulators, capable of delivering up
to 200mA. They are designed for battery-powered
applications where reverse battery protection and long
battery life are critical.
These regulators’ low 3.5µA supply current extends
battery life in applications with long standby periods.
Unlike PNP-based designs, a 2ΩPMOS device main-
tains ultra-low supply current throughout the entire
operating range and in dropout. The parts are internally
protected from output short circuits, reverse battery
connection, and thermal overload. An internal power-
OK (POK) comparator indicates when the output is out
of regulation.
The MAX8880 output is adjustable from 1.25V to 5V
using an external resistor-divider. The MAX8881 pro-
vides only factory-preset output voltages of 1.8V, 2.5V,
3.3V, or 5V (see Ordering Information). Both devices
are available in miniature 6-pin SOT23 packages.
Features3.5µA Supply Current at 12VReverse Battery Protection2.5V to 12V Input Voltage Range±1.5% Output Voltage Accuracy200mA max Output Current2ΩPMOS Output DeviceShort-Circuit and Thermal Overload ProtectionPOK Output for Out-of-Regulation IndicatorFixed 1.8V, 2.5V, 3.3V, and 5V (MAX8881)
Adjustable from 1.25V to 5V (MAX8880)Tiny 6-Pin SOT23 Package
MAX8880/MAX8881
12V, Ultra-Low-IQ, Low-Dropout
Linear Regulators with POK
Pin Configuration
Typical Operating Circuit
________________________Applications19-1679; Rev 0; 4/00
Smoke Detectors
Battery-Powered Alarms
Remote Transmitters
Smart Battery Packs
PDAs
Handy Terminals
CMOS Backup Power
Real-Time Clocks
MAX8880/MAX8881
12V, Ultra-Low-IQ, Low-Dropout
Linear Regulators with POK
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= VOUT + 1V, SHDN= IN, COUT= 4.7µF, 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 to GND................................................................-14V to +14V
SHDNto GND.............................................-0.3V to (VIN+ 0.3V),
-0.3V to +0.3V when VIN< 0V
OUT, FB to GND...............................-0.3V to +6V when VIN> 5.7V,
-0.3V to (VIN + 0.3V) when 0V ≤VIN≤5.7V,
-0.3V to +0.3V when VIN < 0V
POK to GND...........................................................-0.3V to +14V
OUT Continuous Current...................................................200mA
OUT Short Circuit...........................................................Indefinite
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)...........696mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature.........................................-65°C to +165°C
Lead Temperature (soldering, 10s).................................+300°C
MAX8880/MAX8881
12V, Ultra-Low-IQ, Low-Dropout
Linear Regulators with POKSUPPLY CURRENT
vs. INPUT VOLTAGE
MAX8880/1-01
INPUT VOLTAGE (V)
SUPPLY CURRENT (µA)
SUPPLY CURRENT
vs. TEMPERATURE
MAX8880/1-02
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX8880/1-03
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
0.11011001k10k
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCYMAX8880/1-04
FREQUENCY (Hz)
PSRR (dB)10010k1k100k
FREQUENCY (Hz)
MAX186-14A
OUTPUT NOISE SPECTRAL DENSITY
vs. FREQUENCYNOISE (µV/
Hz)
OUTPUT NOISE
vs. LOAD CURRENT
MAX8880/1-06
LOAD CURRENT (mA)
OUTPUT NOISE (
RMS
Typical Operating Characteristics(VIN= 5V, VOUT= 3.3V, IOUT= 30mA, COUT= 4.7µF, TA= +25°C, unless otherwise noted. See Figure 1.)
Note 1:All devices are 100% production tested at TA= +25°C. All temperature limits are guaranteed by design.
Note 2:Output accuracy with respect to nominal preset voltages. FB = OUT.
Note 3:This specification is valid for VIN> 3V.
Note 4:The dropout voltage is defined as VIN- VOUT, when VOUTis 100mV below the value of VOUTfor VIN= VOUT+ 1V.
ELECTRICAL CHARACTERISTICS (continued)(VIN= VOUT + 1V, SHDN= IN, COUT= 4.7µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
MAX8880/MAX8881
12V, Ultra-Low-IQ, Low-Dropout
Linear Regulators with POK
Typical Operating Characteristics (continued)(VIN= 5V, VOUT= 3.3V, IOUT= 30mA, COUT= 4.7µF, TA= +25°C, unless otherwise noted. See Figure 1.)
MAX8880/MAX8881
12V, Ultra-Low-IQ, Low-Dropout
Linear Regulators with POK
Detailed DescriptionThe MAX8880/MAX8881 are low-dropout, low-quies-
cent current linear regulators designed primarily for
battery-powered applications (Figure 1). The MAX8880
provides an adjustable output voltage from 1.25V to 5V
using an external resistor-divider. The MAX8881 is
available in factory preset output voltages of 1.8V, 2.5V,
3.3V, and 5V. Both devices have a +1.25V reference,
error amplifier, MOSFET driver, and P-channel pass
transistor (Figure 2).
Low-Dropout RegulatorThe 1.25V reference is connected to the error amplifi-
er’s inverting input. The error amplifier compares this
reference with the selected feedback voltage and
amplifies the difference. The MOSFET driver reads the
error signal and applies the appropriate drive to the P-
channel pass transistor. If the feedback voltage is lower
than the reference voltage, the pass-transistor gate is
pulled lower, allowing more current to pass, increasing
the output voltage. If the feedback voltage is higher
than the reference voltage, the pass-transistor gate is
driven higher, allowing less current to pass to the out-
put. The output voltage is fed back through either an
internal resistor voltage divider by externally connect-
ing FB to OUT (MAX8881EUT_ _), or an external resis-
tor network connected to FB (MAX8880). Additional
blocks include an output current limiter, reverse battery
protection, a thermal sensor, shutdown logic, and a
POK comparator to indicate when the output is out of
regulation (Figure 2).
Internal P-Channel Pass TransistorThe MAX8880/MAX8881 feature a 2ΩP-channel MOS-
FET pass transistor. This provides advantages over
similar designs using PNP pass transistors, including
longer battery life. The P-channel MOSFET requires no
base drive, which reduces quiescent current consider-
ably. PNP-based regulators waste considerable current
in dropout when the pass transistor saturates. They
also use high base-drive currents under large loads.
The MAX8880/MAX8881 do not suffer from these prob-
lems and consume only 3.5µA of supply current (see
Typical Operating Characteristics).
Dropout VoltageA regulator’s minimum input-output differential (or
dropout voltage) determines the lowest usable supply
voltage. In battery-powered systems, this determines
the useful end-of-life battery voltage. Because the
MAX8880/MAX8881 use a P-channel MOSFET pass
transistor, their dropout voltage is RDS(ON)(2Ω) multi-
plied by the load current (see Electrical Characteristics).
MAX8880/MAX8881
12V, Ultra-Low-IQ, Low-Dropout
Linear Regulators with POK
Reverse Battery ProtectionThe MAX8880/MAX8881 have a unique protection
scheme that limits the reverse supply current to less
than 1mA when VINis forced below ground. The circuit
monitors the polarity of IN, disconnecting the internal
circuitry and parasitic diodes when the battery is
reversed. This feature prevents the device from electri-
cal stress and damage when the battery is connected
backwards. If reverse battery protection is needed,
drive SHDNthrough a 100kΩresistor.
Current LimitingThe MAX8880/MAX8881 include a current limiter. When
the output is shorted to ground, drive to the output
PMOS is limited. The output can be shorted to ground
without damage to the part.
Thermal Overload ProtectionThermal overload protection limits total power dissipa-
tion in the MAX8880/MAX8881. When the internal junc-
tion temperature exceeds TJ= +160°C, the thermal
sensor signals the shutdown logic, turning off the pass
transistor and allowing the IC to cool. The thermal sen-
sor turns the pass transistor on again after the IC’s
junction temperature cools by 15°C, resulting in a
pulsed output during continuous thermal-overload con-
ditions.
Thermal-overload protection is designed to protect the
MAX8880/MAX8881 in the event of fault conditions. For
continuous operation, do not exceed the absolute maxi-
mum junction temperature rating of TJ(MAX)= +150°C.
Operating Region and Power DissipationThe MAX8880/MAX8881’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 airflow. The
power dissipation in the device is P = IOUT(VIN-
VOUT). The maximum power dissipation allowed is:
