MAX884ESA+T ,5V/3.3V or Adjustable, Low-Dropout, Low-IQ, 200mA Linear Regulator with Standby ModeMAX882/MAX883/MAX88419-0275; Rev 4; 7/095V/3.3V or Adjustable, Low-Dropout, Low I , 200mA Linear Re ..
MAX8855ETJ+ ,Dual, 5A, 2MHz Step-Down RegulatorsApplications*EP = Exposed pad.ASIC/CPU/DSP Power SuppliesTypical Operating CircuitDDR Power Supplie ..
MAX8855ETJ+T ,Dual, 5A, 2MHz Step-Down Regulatorsapplications. Total output♦ ±1% Output Accuracy Over Load, Line,error is less than ±1% over load, l ..
MAX8856ETD+T ,USB/AC Adapter, Li+ Linear Battery Charger with Integrated 50mΩ Battery Switch in TDFNApplicationsTypical Operating CircuitCellular Phones, Smartphones, PDAsDigital Cameras, MP3 Players ..
MAX8857AETL+ ,Smallest, All-Internal MOSFET, 7-Channel 2 AA DSC PMICFeaturesThe MAX8857A PMIC provides a complete power-sup- ♦ 95% Efficient Synchronous-Rectified DC-D ..
MAX8857AETL+T ,Smallest, All-Internal MOSFET, 7-Channel 2 AA DSC PMICMAX8857AABRIDGED19-0987; Rev 1; 2/12Smallest, All-Internal MOSFET,7-Channel 2 AA DSC PMIC
MB86626 , KeyWave AFE ADSL Analog Front End
MB86831 ,Microprocessor SPARClite CMOSapplications. Conforming to the SPARC * architecture, the MB86830 series is upward code-compatible ..
MB86831 ,Microprocessor SPARClite CMOSfeatures of the MB86830 series achieves high levels of speed, flexibility, and efficiency, making i ..
MB86831-80PFV ,32-bit Embedded Controllerapplications. Conforming to the SPARC * architecture, the MB86830 series is upward code-compatible ..
MB86833 ,Microprocessor SPARClite CMOSfeatures of the MB86830 series achieves high levels of speed, flexibility, and efficiency, making i ..
MB86836 ,Microprocessor SPARClite CMOSapplications. Conforming to the SPARC * architecture, the MB86830 series is upward code-compatible ..
MAX882CPA+-MAX882CSA+-MAX882CSA+T-MAX882CSA-T-MAX882ESA+-MAX882ESA+T-MAX882ESA-T-MAX883CPA+-MAX883CSA+-MAX883CSA+T-MAX883CSA-T-MAX883ESA+-MAX884CSA+-MAX884ESA+-MAX884ESA+T
5V/3.3V or Adjustable, Low-Dropout, Low-IQ, 200mA Linear Regulator with Standby Mode
General DescriptionThe MAX882/MAX883/MAX884 linear regulators maxi-
mize battery life by combining ultra-low supply currents
and low dropout voltages. They feature 200mA output
current capability at up to +125°C junction temperature
and come in a 1.5W SOIC package. The 1.5W package
(compared to 0.47W for standard SOIC packages)
allows a wider operating range for the input voltage and
output current. The MAX882/MAX883/MAX884 use a p-
channel MOSFET pass transistor to maintain a low 11µA
(15µA max) supply current from no-load to the full
200mA output. Unlike earlier bipolar regulators, there are
no PNP base current losses that increase with output
current. In dropout, the MOSFET does not suffer from
excessive base currents that occur when PNP transistors
go into saturation. Typical dropout voltages are 220mV
at 5V and 200mA, or 320mV at 3.3V and 200mA.
The MAX882 features a 7µA standby mode that disables
the output but keeps the reference, low-battery compara-
tor, and biasing circuitry alive. The MAX883/MAX884 fea-
ture a shutdown (OFF) mode that turns off all circuitry,
reducing supply current to less than 1µA. All three
devices include a low-battery-detection comparator, fold-
back current limiting, reverse-current protection, and
thermal-overload protection.
The output is preset at 3.3V for the MAX882/MAX884
and 5V for the MAX883. In addition, all devices employ
Dual Mode™ operation, allowing user-adjustable outputs
from 1.25V to 11V using external resistors. The input volt-
age supply range is 2.7V to 11.5V.
For low-dropout linear regulators with output currents up
to 500mA, refer to the MAX603/MAX604 data sheet.
ApplicationsPagers and Cellular Phones
3.3V and 5V Regulators
1.25V to 11V Adjustable Regulators
High-Efficiency Linear Regulators
Battery-Powered Devices
Portable Instruments
Solar-Powered Instruments
FeaturesFoldback Current LimitingHigh-Power (1.5W) 8-Pin SO PackageDual Mode Operation: Fixed or Adjustable
Output from 1.25V to 11VLarge Input Range (2.7V to 11.5V)Internal 1.1Ωp-Channel Pass Transistor
Draws No Base CurrentLow 220mV Dropout Voltage at 200mA
Output Current11µA (typ) Quiescent Current1µA (max) Shutdown Mode or 7µA (typ)
Standby ModeLow-Battery Detection ComparatorReverse-Current ProtectionThermal-Overload Protection
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
Pin Configuration
Typical Operating Circuit19-0275; Rev 4; 7/09
Ordering Information continued at end of data sheet.*Dice are tested at TJ= +25°C, DC parameters only.
**Contact factory for availability.
MAX882
MAX883
MAX884
CIN
O.1μF
COUT
2.2μF
OUTPUT
VOLTAGE
INPUT
VOLTAGE
BATTERY
LBI
OFF (STBY)
( ) ARE FOR MAX882.OUT
GNDSET
ON/OFF
LBI
OFF (STBY)
( ) ARE FOR MAX882.
GNDOUT
GND
SET
LBO
DIP/SOTOP VIEW
MAX882
MAX883
MAX884
Ordering Information
PARTTEMP RANGEPIN-
PACKAGE
MAX882CPA0°C to +70°C8 PDIP
MAX882CSA0°C to +70°C8 SO
MAX882C/D0°C to +70°CDice*
MAX882EPA-40°C to +85°C8 PDIP
MAX882ESA-40°C to +85°C8 SO
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VIN= 6V (MAX883) or VIN= 4.3V (MAX882/MAX884), COUT= 2.2µF, STBYor OFF= VIN, SET = GND, LBI = VIN, TJ= -40°C to
+85°C, unless otherwise noted. Typical values are at TJ= +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.
Supply Voltage (IN or OUT to GND).......................-0.3V to +12V
Output Short-Circuit Duration...............................................1min
Continuous Output Current...............................................300mA
LBOOutput Current............................................................50mA
LBOOutput Voltage and LBI,
SET, STBY, OFFInput Voltages............-0.3V to the greater of
(IN + 0.3V) or (OUT + 0.3V)
Continuous Power Dissipation (TJ= +70°C)
Plastic DIP (derate 9.09mW/°C above +70°C)............727mW
High-Power SO (derate 18.75mW/°C above +70°C).......1.5W
CERDIP (derate 8.00mW/°C above +70°C).................640mW
Operating Temperature Ranges
MAX88_C_A........................................................0°C to +70°C
MAX88_E_A.....................................................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX88_C_A2.711.5
MAX88_E_A2.911.5Input Voltage RangeVINSET = OUT, RL =
1kΩ
MAX88_MJA3.011.5
IOU T = 100µA - 250m A,
0°C ≤ TJ ≤ +85°C4.755.005.25
MAX883,
6.0V ≤ VIN ≤ 11.5VIOU T = 100µA - 250m A,
-40°C ≤ TJ ≤ +85°C4.655.35
IOU T = 100µA - 200m A,
0°C ≤ TJ ≤ +85°C3.153.303.45
Output Voltage (Note 2)VOUT
MAX882/MAX884,
4.3V ≤ VIN ≤ 11.5VIOU T = 100µA - 200m A,
-40°C ≤ TJ ≤ +85°C3.073.53
MAX883C_A/E_A60100IOUT = 1mA to
200mAMAX883MJA150Load RegulationΔVLDR
IOUT = 1mA to
150mAMAX882, MAX88430100
Line RegulationΔVLNR(VOUT + 0.5V) < VIN < 11.5V, IOUT = 10mA1040mV
IOUT = 100mA110220MAX883IOUT = 200mA220440
IOUT = 100mA160320Dropout Voltage (Note 3)ΔVDO
MAX882/MAX884IOUT = 200mA320640
MAX88_C_A/E_A1115SET = OUT, VIN =MAX88_MJA30
MAX88_C_A/E_A1525Quiescent CurrentIQ
VIN = 11.5VMAX88_MJA40
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
ELECTRICAL CHARACTERISTICS (continued)(VIN= 6V (MAX883) or VIN= 4.3V (MAX882/MAX884), COUT= 2.2µF, STBYor OFF= VIN, SET = GND, LBI = VIN, TJ= -40°C to
+85°C, unless otherwise noted. Typical values are at TJ= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX882C_A/E_A715STBY = 0, VIN =
6V, SET = OUTMAX882MJA30
MAX882C_A/E_A1025STBY Quiescent Current (Note 4)IQ STBY
STBY = 0, VIN =
11.5V, SET = OUTMAX882MJA40
MAX88_C_A0.011
MAX88_E_A5OFF Quiescent CurrentIQ OFF
OFF = 0, RL = 1kΩ,
VIN = 11.5V
MAX883/MAX884MAX88_MJA10
MAX88_C_A1
MAX88_E_A3Minimum Load CurrentIOUT(MIN)VIN = 11.5V, SET =
OUT
MAX88_MJA10
VOUT < 0.8V170Foldback Current Limit (Note 5)ILIMVOUT > 0.8V and VIN - VOUT > 0.7V430mA
Thermal Shutdown TemperatureTSD+160°C
Thermal Shutdown HysteresisΔTSD10°C
VOUT = 4.5VMAX883_A620
Reverse-Current-Protection
(Note 6)ΔVRTHVOUT = 3.0VMAX882_A,
MAX884_A620mV
MAX882: VIN = 0, STBY = 0, VOUT = 3.0V7
Reverse Leakage CurrentIRVLMAX883/MAX884: VIN = 0, OFF = 0, VOUT
= 3.0V0.01µA
Startup OvershootVOSHRL = 1kΩ, COUT = 2.2µF% of
VOUT
Time Required to Exit OFF or
STBY ModesTSTARTVIN = 9V, RL = 33Ω, OFF from 0 to VIN, 0%
to 95% of VOUT200µs
For internal feedback6530Dual Mode SET ThresholdVSET THFor external feedback15065mV
0°C ≤ TJ ≤ +85°C1.161.201.24SET Reference VoltageVSETSET = OUT, RL =
1kΩ-40°C ≤ TJ ≤ +85°C1.121.28V
SET Input Leakage CurrentISETVSET = 1.5V or 0±0.01±50nA
0°C ≤ TJ ≤ +85°C1.151.201.25LBI Threshold VoltageVLBILBI signal falling-40°C ≤ TJ ≤ +85°C1.111.29V
LBI HysteresisΔVLBI7mV
LBI Input Leakage CurrentILBIVLBI = 1.5V±0.01±50nA
LBO Output Low VoltageVLBOLILBO sink = 1.2mA, VLBI = 1V, 3V < VIN <
11.5V, SET = OUT90250mV
LBO Output Leakage CurrentIBLO LKGVLBI = VIN, VLBO = VIN0.010.1µA
MAX88_C_A0.011
MAX88_E_A3OUT Leakage CurrentIOUT LKG VIN = 11.5V, VOUT
= 2V, SET = OUT
MAX88_MJA10
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
Note 1:Electrical specifications are measured by pulse testing and are guaranteed for a junction temperature (TJ) within the operat-ing temperature range, unless otherwise noted. Specifications to -40°C are guaranteed by design and not production tested.
Note 2:(VIN- VOUT) is limited to keep the product (IOUTx (VIN- VOUT)) from exceeding the package power dissipation limits. See
Figure 5. Therefore, the combination of high output current and high supply voltage is not tested.
Note 3:Dropout Voltage is (VIN- VOUT) when VOUTfalls to 100mV below its nominal value at VIN= (VOUT+ 2V). For example, the
MAX883 is tested by measuring the VOUTat VIN= 7V, then VINis lowered until VOUTfalls 100mV below the measured value.
The difference (VIN- VOUT) is then measured and defined as ∆VDO.
Note 4:Since standby mode inhibits the output but keeps all biasing circuitry alive, the Standby Quiescent Current is similar to thenormal operating quiescent current.
Note 5:Foldback Current Limit was characterized by pulse testing to remain below the maximum junction temperature (not production tested).
Note 6:The Reverse-Current Protection Threshold is the output/input differential voltage (VOUT- VIN) at which reverse-current
protection switchover occurs and the pass transistor is turned off. See the section Reverse-Current Protectionin the Detailed
Description.
Note 7:Noise is tested using a bandpass amplifier with two poles at 10Hz and two poles at 10kHz.
ELECTRICAL CHARACTERISTICS (continued)(VIN= 6V (MAX883) or VIN= 4.3V (MAX882/MAX884), COUT= 2.2µF, STBYor OFF= VIN, SET = GND, LBI = VIN, TJ= -40°C to
+85°C, unless otherwise noted. Typical values are at TJ= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSTBY Threshold VoltageV STBYSTBY signal falling, MAX882_A1.151.201.25V
STBY HysteresisΔV STBYMAX882_A7mV
STBY Input Leakage CurrentISTBYV STBY = VIN or 0, MAX882_A±0.01±50nA
VIL OFFIn off mode, MAX883_A, MAX884_A0.4
In on mode, SET = OUT, VIN < 6V,
MAX883_A, MAX884_A2.0OFF Threshold VoltageVIH OFF
In on mode, SET = OUT, 6V < VIN < 11.5V,
MAX883_A, MAX884_A3.0
OFF Input Leakage CurrentIOFF V OFF = VIN or 0±0.01±50nA
Output Noiseen10Hz to 10kHz, SET = OUT, RL = 1kΩ,
COUT = 2.2µF (Note 7)250µVRMS
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
Typical Operating Characteristics(VIN= 7V for MAX883, VIN= 5.3V for MAX882/MAX884, OFFor STBY= VIN, SET = GND, LBI = VIN, LBO= OPEN, CIN= COUT= 2.2µF,= 1kΩ, TA = +25°C, unless otherwise noted.)
OUTPUT VOLTAGE AND QUIESCENT
CURRENT vs. LOAD CURRENT
MAX882/4-01
LOAD CURRENT (mA)
NORMALIZED OUTPUT VOLTAGE (%)
VOUT = 5V (MAX883)
VOUT = 3.3V (MAX882/MAX884)
OUTPUT VOLTAGE
NORMALIZED TO OUTPUT
VOLTAGE AT 1mA
QUIESCENT CURRENT (mA)IQ
OUTPUT VOLTAGE AND QUIESCENT
CURRENT vs. SUPPLY VOLTAGEMAX882/4-03
SUPPLY VOLTAGE (V)
OUTPUT VOLTAGE (V)
QUIESCENT CURRENT (mA)3456789101112
VOUT = 5V (MAX883)
VOUT = 3.3V (MAX882/MAX884)
IQ (MAX882/MAX884)
IQ (MAX883)
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX882/4-05
LOAD CURRENT (mA)
DROPOUT VOLTAGE (V)50100150200250300
VOUT = 3.3V (MAX882/MAX884)
VOUT = 5V (MAX883)
QUIESCENT CURRENT
vs. TEMPERATUREMAX882/4-04
TEMPERATURE (°C)
QUIESCENT CURRENT (
10Hz to 10kHz OUTPUT NOISE
10ms/div
OUTPUT NOISE (1mV/div)
MAX883
VOUT = 5V
MAX882/4-06
OUTPUT VOLTAGE
vs. TEMPERATURE
MAX882/4-04a
TEMPERATURE (°C)
NORMALIZED OUTPUT VOLTAGE (%)
-55-35-15525456585105125
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
LINE-TRANSIENT RESPONSE500μs/div
MAX883: VOUT = 5V, CIN = 0μF, tR = 15μs, tF = 13μs
A: VIN = 8V (HIGH) / VIN = 7V (LOW)
B: OUTPUT VOLTAGE (100mV/div)
LOAD-TRANSIENT RESPONSE1ms/div
MAX883: VOUT = 5V, tR = 24μs, tF = 44μs
A: OUTPUT VOLTAGE (100mV/div)
B: IOUT = 250mA (HIGH) / IOUT = 50mA (LOW)
OVERSHOOT AND TIME
EXITING SHUTDOWN MODERL = 100Ω
500μs/div
A: OFF PIN VOLTAGE (1V/div):
RISE TIME = 9μs
B: MAX883 OUTPUT VOLTAGE (1V/div):
DELAY = 135μs, RISE TIME = 67μs,
OVERSHOOT = 0%
LBO LOW VOLTAGE
vs. SINK CURRENT
MAX882/4-10
SINK CURRENT (mA)
LBO LOW VOLTAGE (V)
MAX882/MAX884
MAX883
Typical Operating Characteristics (continued)(VIN= 7V for MAX883, VIN= 5.3V for MAX882/MAX884, OFFor STBY= VIN, SET = GND, LBI = VIN, LBO= OPEN, CIN= COUT= 2.2µF,= 1kΩ, TA = +25°C, unless otherwise noted.)
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
_______________Detailed DescriptionThe MAX882/MAX883/MAX884 are micropower, low-
dropout linear regulators designed primarily for battery-
powered applications. They feature Dual Mode operation,
allowing a fixed output of 5V for the MAX883 and 3.3V for
the MAX882/MAX884, or an adjustable output from 1.25V
to 11V. These devices supply up to 200mA while requiring
less than 15µA quiescent current. As illustrated in Figure
1, they consist of a 1.20V reference, error amplifier, MOS-
FET driver, p-channel pass transistor, dual-mode com-
parator, and feedback voltage-divider.
The 1.20V reference is connected to the error amplifier’s
inverting input. The error amplifier compares this refer-
ence 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 refer-
ence, the pass transistor’s gate is pulled lower, allowing
more current to pass and increasing the output voltage. If
the feedback voltage is too high, the pass transistor gate
is pulled up, allowing less current to pass to the output.
The output voltage is fed back through either an inter-
nal resistor voltage-divider connected to the OUT pin,
or an external resistor network connected to the SET
pin. The dual-mode comparator examines the SET pin
voltage and selects the feedback path used. If the SET
pin is below 65mV, internal feedback is used and the
3.3V for the MAX882/MAX884. Additional blocks
include a foldback current limiter, reverse-current pro-
tection, a thermal sensor, shutdown or standby logic,
and a low-battery-detection comparator.
Internal p-Channel Pass TransistorThe MAX882/MAX883/MAX884 feature a 200mA P-
channel MOSFET pass transistor. This provides several
advantages over similar designs using PNP pass tran-
sistors, including longer battery life.
The p-channel MOSFET requires no base drive, which
reduces quiescent current considerably. PNP-based reg-
ulators waste large amounts of current in dropout when
the pass transistor saturates. They also use high base-
drive currents under large loads. The MAX882/MAX883/
MAX884 do not suffer from these problems and consume
only 11µA of quiescent current during light loads, heavy
loads, and dropout.
Output Voltage SelectionThe MAX882/MAX883/MAX884 feature Dual Mode
operation. In preset voltage mode, the MAX883’s out-
put is set to 5V and the MAX882/MAX884’s output is set
to 3.3V, using internal trimmed feedback resistors.
Select this mode by connecting SET to ground.
In preset voltage mode, impedances between SET and
ground should be less than 100kΩ. Otherwise, spurious
conditions could cause the voltage at SET to exceed
Pin Description
PIN
MAX882MAX883/
MAX884
NAMEDESCRIPTIONLBO
Low-Battery Output is an open-drain output that goes low when LBI is less than 1.2V. Connect
to IN or OUT through a pull-up resistor. LBO is undefined during shutdown mode
(MAX883/MAX884).2SETFeedback for setting the output voltage. Connect to GND to set the output voltage to the
preselected 3.3V or 5V. Connect to an external resistor network for adjustable-output operation.
3, 63, 6GND
Ground pins—also function as heatsinks in the SO package. All GND pins must be soldered to
the PC board for proper power dissipation. Connect to large copper pads or planes to channel
heat from the IC.4OUTRegulator Output. Fixed or adjustable from 1.25V to 11.0V. Sources up to 200mA. Bypass with a
2.2µF capacitor.5INRegulator Input. Supply voltage can range from 2.7V to 11.5V.—STBYStandby. Active-low comparator input. Connect to GND to disable the output or to IN for normal
operation. A resistor network (from IN) can be used to set a standby mode threshold.7OFFShutdown. Active-low logic input. In OFF mode, supply current is reduced below 1µA and
VOUT = 0.8LBILow-Battery comparator Input. Tie to IN when not used.
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear RegulatorsIn adjustable mode, the user selects an output voltage
in the 1.25V to 11V range by connecting two external
resistors, used as a voltage-divider, to the SET pin
(Figure 2).
The output voltage is set by the following equation:
where VSET= 1.20V.
To simplify resistor selection:
Since the input bias current at SET is nominally zero,
large resistance values can be used for R1 and R2 to
minimize power consumption without losing accuracy.
Up to 1.5MΩis acceptable for R2. Since the VSETtoler-
ance is less than ±40mV, the output can be set using
fixed resistors instead of trim pots.
Standby Mode (MAX882)The MAX882 has a standby feature that disconnects
the input from the output when STBYis brought low, but
keeps all other circuitry awake. In this mode, VOUT
drops to 0, and the internal biasing circuitry (including
the low-battery comparator) remains on. The maximum
quiescent current during standby is 15µA. STBYis a
comparator input with the other input internally tied to
the reference voltage. Use a resistor network as shown
in Figure 3 to set a standby-mode threshold voltage for
undervoltage lockout. Connect STBYto IN for normal
operation.
OFF Mode (MAX883/MAX884)A low-logic input on the OFFpin shuts down the
MAX883/MAX884. In this mode, the pass transistor,
control circuit, reference, and all biases are turned off,
and the supply current is reduced to less than 1µA.
LBOis undefined in OFFmode. Connect OFFto IN for
normal operation.
R1 R2 V 1OUT
SET=−⎛⎜⎞⎟ROUTSET=+⎛⎜⎞⎟11
Figure 1. MAX882/MAX883/MAX884 Functional Diagram
OUT
SET
65mV
ERROR AMP
OFF
(STBY)
GND
LBO
LBI
MOSFET DRIVER
WITH FOLDBACK
CURRENT LIMIT
REVERSE-
CURRENT
PROTECTION
SHUT-
DOWN
LOGIC
1.20V
REFERENCE
THERMAL
SENSOR
( ) ARE FOR MAX882.
DUAL-MODE
COMPARATOR
LOW-BATTERY
COMPARATOR
MAX882/MAX883/MAX884
5V/3.3V or Adjustable, Low-Dropout,
Low IQ, 200mA Linear Regulators
Foldback Current Limiting The MAX882/MAX883/MAX884 also include a foldback
current limiter. It monitors and controls the pass transis-
tor’s gate voltage, estimating the output current and
limiting it to 430mA for output voltages above 0.8V and
(VIN- VOUT) > 0.7V. If the output voltage drops below
0.8V, implying a short-circuit condition, the output cur-
rent is limited to 170mA. The output can be shorted to
ground for 1min without damaging the device if the
package can dissipate (VINx 170mA) without exceed-
ing TJ= +150°C. When the output is greater than 0.8V
and (VIN- VOUT) < 0.7V (dropout operation), no current
limiting is allowed, to provide maximum load drive.
Thermal Overload ProtectionThermal overload protection limits total power dissipa-
tion in the MAX882/MAX883/MAX884. When the junc-
tion temperature exceeds TJ= +160°C, the thermal
sensor sends a signal to the shutdown logic, turning off
the pass transistor and allowing the IC to cool. The
thermal sensor turns the pass transistor on again after
the IC’s junction temperature cools by 10°C, resulting in
a pulsed output during thermal overload conditions.
Thermal overload protection is designed to protect the
MAX882/MAX883/MAX884 if fault conditions occur. It is
not intended to be used as an operating mode.
Prolonged operation in thermal-shutdown mode may
reduce the IC’s reliability. For continual operation, do
not exceed the absolute maximum junction temperature
rating of TJ= +150°C.
Power Dissipation and Operating RegionMaximum power dissipation of the MAX882/MAX883/
MAX884 depends on the thermal resistance of the case
and PC 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). The resulting power dissipation
is as follows:
where (TJ - TA) is the temperature difference between
the MAX882/MAX883/MAX884 die junction and the sur-
rounding air, θJB(or θJC) is the thermal resistance of
the package chosen, and θBAis the thermal resistance
through the PC board, copper traces, and other materi-
als to the surrounding air.
The 8-pin small-outline package for the MAX882/
MAX883/MAX884 features a special lead frame with a
lower thermal resistance and higher allowable power
dissipation. This package’s thermal resistance package
is θJB= 53°C/W, compared with θJB= 110°C/W for an
8-pin plastic DIP package and θJB= 125°C/W for an 8-
pin ceramic DIP package.(TT)BA=−θθ
Figure 2. Adjustable Output Using External Feedback
Resistors
Figure 3. Setting an Undervoltage Lockout Threshold Using
STBY
MAX882
MAX883
MAX884
CIN
O.1μF
COUT
2.2μF
OUTPUT
VOLTAGE
INPUT
VOLTAGE
LBI
OFF
(STBY)
( ) ARE FOR MAX882.
R1 + R2VOUT = VSET, VSET = 1.20V
LOAD
OUT
GND
SET
MAX882
CIN
O.1μFCOUT
2.2μF
OUTPUT
VOLTAGE
INPUT
VOLTAGELBI
SET
STBY
R1+ R2VSTBY TRIP = VSTBY , VSTBY = 1.20V
OUT
GND
