MAX4837ETT25BD3+ Fast Delivery |IC PHOENIX CO.,LIMITED

MAX4837ETT25BD3+ ,500mA LDO Linear Regulators with Current-Limiting SwitchApplicationsMAX4836ETTxy_-T -40°C to +85°C 6 TDFN-6SDIO Ports and Devices Notebook ComputersMAX4837 ..
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MAX8880ETT ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKELECTRICAL CHARACTERISTICS(V = V + 1V, SHDN = IN, C = 4.7µF, T = -40°C to +85°C, unless otherwise n ..
MAX8880ETT+ ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKapplications with long standby periods. Unlike ♦ 200mA max Output CurrentPNP-based designs, a 2Ω PM ..
MAX8880ETT+T ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKMAX8880/MAX888119-1679; Rev 2; 12/0712V, Ultra-Low-I , Low-DropoutQLinear Regulators with POK
MAX8880EUT+T ,12V, Ultra-Low-IQ, Low-Dropout Linear Regulators with POKApplicationsSmoke Detectors PDAs Handy TerminalsBattery-Powered AlarmsCMOS Backup PowerRemote Trans ..

MAX4837ETT25BD3+
500mA LDO Linear Regulators with Current-Limiting Switch
General Description
The MAX4836/MAX4837 family of low-dropout (LDO)
linear regulators feature an accurate current-limiting
switch with an integrated FLAGor RESETfunction. These
devices operate from 2.5V to 5.5V and deliver up to
500mA of load current at a preset output voltage. Preset
output voltage levels are 1.8V/2.5V/2.8V/3.0V/3.3V.
The MAX4836/MAX4837 offer a programmable soft-
start control function to eliminate false reset during
startup. The MAX4836 provides a FLAGfunction to noti-
fy the system when the load current exceeds the limit.
The MAX4837 provides a RESETfunction to notify the
system when the output drops below the threshold.
Additionally, reverse-current protection prevents cur-
rent flowing from the output to the input. Other features
include a low 90µA quiescent current, a 0.1µA shut-
down current.
The MAX4836/MAX4837 are available in space-saving
6-pin SOT23 and TDFN packages. Each device is speci-
fied over the -40°C to +85°C extended temperature
range. Contact factory for other programmed output volt-
age versions from 1.5V to 3.3V in 100mV increments.
For pin-compatible 100mA versions of this device, refer
to the MAX4832/MAX4833. For pin-compatible 250mA
versions of this device, refer to the MAX4834/MAX4835.
Applications
SDIO Ports and DevicesNotebook Computers
USB Ports and DevicesCell Phones
PDAs and Palmtop DevicesGPS Systems
FeaturesGuaranteed Minimum 500mA Load CurrentAccurate Current LimitPreset Output Voltages: 1.8V/2.5V/2.8V/3.0V/3.3V2.5V to 5.5V Supply Voltage RangeAdjustable Soft-StartLow Dropout VoltageThermal ShutdownReverse-Current ProtectionShutdown Output Discharge (MAX4837)Low 90µA Supply CurrentUltra-Low 0.1µA Shutdown CurrentFLAGand Latch Off (MAX4836) or RESET
(MAX4837)Tiny SOT23 and TDFN (3mm x 3mm) Packages
MAX4836/MAX4837
500mA LDO Linear Regulators with
Current-Limiting Switch
Ordering Information
19-3374; Rev 0; 7/04
Note:“xy” are placeholders for the output voltage levels of the
devices. Insert the values found in Table 1 at the end of this doc-
ument in the place of “xy”. The “_” is a placeholder for either the
RESETor the FLAGfeature. Insert “B” in the place of “_” for
RESETand “C” for FLAG. “dd” is a placeholder for the reset
timeout period. Insert the values found in Table 2 in the place of
“dd.” For example, MAX4837EUT18BD2 has a 1.8V output volt-
age, RESETfeature, and a 30ms reset timeout period. Note that
“dd” applies only to the devices with RESEToption and does not
apply to the devices with FLAGoption. For devices with the
FLAGoption, leave dd blank. Standard versions require a mini-
mum order increment of 2.5k units. Nonstandard versions must
be ordered in 10k unit increments. Contact factory for availability.
*Future product—contact factory for availability.
PARTTEMP RANGEPIN-PACKAGE
MAX4836EUTxy_-T*-40°C to +85°C6 SOT23-6
MAX4836ETTxy_-T-40°C to +85°C6 TDFN-6
MAX4837EUTxy_dd-T*-40°C to +85°C6 SOT23-6
MAX4837ETTxy_dd-T-40°C to +85°C6 TDFN-6OUTSSRESET
(FLAG)GNDSHDN
MAX4836/MAX4837
TDFN
EXPOSED PADDLE
TOP VIEW
( ) MAX4836ETTxyC ONLY.
Pin Configurations
Pin Configurations continued at end of data sheet.
Tables 1 and 2 and Selector Guide appear at end of data
sheet.
MAX4836/MAX4837
500mA LDO Linear Regulators with
Current-Limiting Switch
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, 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, FLAG, OUT to GND................................-0.3V to +6V
RESETto GND .........................................-0.3V to (VOUT+ 0.3V)
SS to GND...................................................-0.3V to (VIN+ 0.3V)
IN to OUT...............................................................................±6V
OUT Short Circuit to GND..........................................Continuous
All Pins ESD Handling (Human Body Model).........................2kV
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 9.1mW/°C above +70°C)................727mW
6-Pin TDFN (derate 24.4mW/°C above +70°C)..........1951.2mW
Operating Temperature Range...........................-40°C to +85°C
Operating Junction Temperature Range...........-40°C to +125°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Operating VoltageVIN2.55.5V
Input Undervoltage Lockout
ThresholdVUVLOVIN rising2.002.25V
Input Undervoltage Lockout
Threshold Hysteresis50mV
SHDN = IN, IOUT = 090150
SHDN = IN, IOUT = 0,
VUVLO < VIN < VOUT (nominal)150Quiescent CurrentIQ
SHDN = GND, IOUT = 00.12
TA = +25°C200300Dropout Voltage (Note 2)IOUT = 500mATA = -40°C to +85°C330mV
IOUT = 1mA to 500mA, TA = +25°C-1.3+1.3Output Voltage Accuracy
IOUT = 1mA to 500mA, TA = -40°C to +85°C-2+2
%VNOM
Output CurrentIOUT500mA
Output Current LimitVOUT = 0V540660mA
Reverse Current at VINVOUT = 5.5V, VIN = 0V to VOUT0.12µA
CSS = not connected0.512.0
CSS = 0.01µF41015Soft-Start Time (Note 3)tSS
CSS = 0.1µF40100150
TA = +25°C-0.04+0.02+0.065Line Regulation (Note 4)VOUT + 0.5V < VIN <
5.5V, ILOAD = 100µATA = -40°C to +85°C-0.05+0.03+0.08
%VNOM/
Load Regulation100µA < ILOAD < 500mA, VIN = VOUT + 1V1.3%VNOM
Output Noise10Hz to 100kHz, CSS = 0.01µF70µVRMS
SHUTDOWN INPUT (SHDN)
OUT Discharge Resistance in
Shutdown (MAX4837)SHDN = GND900Ω
SHDN Input-Voltage HighVIH1.4V
SHDN Input-Voltage LowVIL0.5V
SHDN Input Hysteresis30mV
SHDN Input Leakage CurrentSHDN = IN or GND-100+100nA
MAX4836/MAX4837
500mA LDO Linear Regulators with
Current-Limiting Switch
Note 1:Parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation over the
specified temperature range.
Note 2:The dropout voltage is measured from VINto VOUTwhen VOUTis 2% below its nominal value. The nominal output voltage is
measured from VOUTto GND when VINis 1V greater than VOUT. Defined only for VOUT≥2.5V.
Note 3:Soft-start time is defined as the time required for the output to rise from 10% of its nominal value to 90% of its nominal value.
Note 4:For VOUT< 2V, VINmust be above 2.5V.
Note 5:This is the maximum time OUT can be out of tolerance before a reset is issued. It is implemented to ensure that momentary
output glitches do not trigger a reset condition.
Note 6:In startup mode, the blanking time counter is not started until the soft-start time has elapsed. The total time from startup to
FLAGissued is tSS+ tBLANK.
ELECTRICAL CHARACTERISTICS (continued)
(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
RESET OUTPUT (MAX4837)
RESET ThresholdVRESET0.85 x
VOUT
0.875 x
VOUT
0.90 x
VOUTV
OUT Drop to RESET Delay
(Note 5)tOR35µs
D1 timing option2.53.755.0
D2 timing option203040
D3 timing option150225300RESET Timeout PeriodtRESET
D4 timing option120018002400
VOUT ≥ 1.0V, ISINK = 50µA, RESET asserted0.3
RESET Output-Voltage LowVOUT ≥ 1.5V, ISINK = 3.2mA, RESET
asserted0.4V
RESET Output-Voltage HighVOUT ≥ 2.0V, ISOURCE ≤ 500µA,
RESET deasserted
0.8 x
VOUTV
FLAG OUTPUT (MAX4836)
Blanking Time (Note 6)tBLANKVOUT + 1V ≤ VIN ≤ 5.5V, OUT = GND51017ms
Open-Drain FLAG Output-
Voltage LowISINK = 3.2mA, FLAG asserted, VOUT ≥ 1.5V0.4V
Open-Drain FLAG Leakage
CurrentVFLAG = 5.5V0.011µA
THERMAL PROTECTION
Thermal-Shutdown TemperatureJunction temperature rising+165°C
Thermal-Shutdown Hysteresis15°C
MAX4836/MAX4837
500mA LDO Linear Regulators with
Current-Limiting Switch
Typical Operating Characteristics
(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
QUIESCENT CURRENT vs. INPUT VOLTAGE
(NO LOAD)
MAX4836 toc01
VIN (V)4321
TA = +85°C
TA = -40°C
TA = +25°C
VOUT = 1.5V
QUIESCENT CURRENT vs. INPUT VOLTAGE
(500mA LOAD)
MAX4836 toc02
VIN (V)432106
TA = +85°C
VOUT = 3.3V
TA = -40°C
TA = +25°C
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX4836 toc03
RESET THRESHOLD OVERDRIVE (mV)
PULSE DURATION (
RESET ASSERTS
ABOVE THIS LINE
VIN = 3.5V
VOUT = 2.5V
DROPOUT VOLTAGE vs. LOAD CURRENT
MAX4836 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
VOUT = 3.3V
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
MAX4836 toc05
FREQUENCY (kHz)
PSRR (dB)10.1
VOUT = 2V
COUT = 3.3μF
ILOAD = 20mA
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
MAX4836 toc06
LOAD CURRENT (mA)
OUT
ESR (
VOUT = 1.8V
COUT = 3.3μF
STABLE REGION
OUTPUT NOISE vs. FREQUENCY
MAX4836 toc07
FREQUENCY (Hz)
OUTPUT NOISE (
RMS
10k1k100100k
VIN = 3V
VOUT = 1.8V
CSS = 10nF
ILOAD = 0
SOFT-START RESPONSE
(CSS = FLOATING)
MAX4836 toc08
VSS
1V/div
VOUT
2V/div
VIN
2V/div
2ms/div
tSS
MAX4836/MAX4837
500mA LDO Linear Regulators with
Current-Limiting Switch
SOFT-START RESPONSE
(CSS = 0.01μF)
MAX4836 toc09
VSS
1V/div
VOUT
2V/div
VIN
2V/div
2ms/div
tSS
SOFT-START RESPONSE
(CSS = 0.1μF)
MAX4836 toc10
VIN
2V/div
VSS
1V/div
VOUT
2V/div
20ms/div
tSS
LOAD-TRANSIENT RESPONSE
MAX4836 toc11
VOUT
50mV/div
AC-COUPLED
100μs/div
VIN = 4.3V
VOUT = 3.3V
CIN = 0.1μF
COUT = 3.3μF
ILOAD: STEP FROM 10mA TO 100mA
BACK TO 10mA
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
MAX4836 toc12
VOUT
50mV/div
AC-COUPLED
100μs/div
VIN = 3.4V
VOUT = 3.3V
CIN = 0.1μF
COUT = 3.3μF
ILOAD: STEP FROM 10mA TO 100mA
BACK TO 10mA
LINE-TRANSIENT RESPONSE
MAX4836 toc13
VOUT
50mV/div
AC-COUPLED
100μs/div
CIN = 0.1μF
COUT = 3.3μF
VOUT = 3.3V
ILOAD = 10mA
VIN
500mV/div
4.5V
RESET RESPONSE TO VIN
MAX4836 toc14
VRESET
2V/div
VOUT
2V/div
VIN
2V/div
40ms/div
tRESET
CSS = FLOATING
RESET RESPONSE TO VOUT
MAX4836 toc15
VRESET
1V/div
VOUT
1V/div
40ms/div
tRESET
VIN = 3.5V, CSS = FLOATING
RESET RESPONSE TO SHUTDOWN
MAX4836 toc16
VRESET
2V/div
VOUT
2V/div
VSHDN
2V/div
40ms/div
tRESET
VIN = 3.5V, CSS = FLOATING
Typical Operating Characteristics (continued)
(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
MAX4836/MAX4837
500mA LDO Linear Regulators with
Current-Limiting Switch
Typical Operating Characteristics (continued)
(VIN= VOUT+ 1V, SHDN= IN, COUT= 3.3µF, TA= +25°C, unless otherwise noted.)
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND < BLANKING TIME
MAX4836 toc17
VOUT
2V/div
1ms/div
IOUT
200mA/div
VFLAG
5V/div
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND > BLANKING TIME
(IN IS TOGGLED)
MAX4836 toc18
VOUT
1V/div
10ms/div
VIN
2V/div
VFLAG
2V/div
FLAG CONNECTED TO LOGIC SUPPLY
tBLANK
STARTUP IN AN OVERLOAD CONDITION
(CSS NOT CONNECTED)
MAX4836 toc20
VSS
1V/div
VFLAG
2V/div
VOUT
2V/div
2ms/div
tBLANK
VIN
2V/div
tSS
VOUT = 2.5V
ILOAD = ILIMIT MAXIMUM
FLAG CONNECTED TO LOGIC SUPPLY
STARTUP IN AN OVERLOAD CONDITION
(CSS = 0.01μF)
MAX4836 toc21
VSS
1V/div
VFLAG
2V/div
VOUT
2V/div
4ms/div
tBLANK
VIN
2V/div
tSS
VOUT = 2.5V
ILOAD = ILIMIT MAXIMUM
FLAG CONNECTED TO LOGIC SUPPLY
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX4836 toc22
TEMPERATURE (°C)
NORMALIZED OUTPUT VOLTAGE3510-15
NORMALIZED TO +25°C
ILOAD = 500mA
ILOAD = 300mA
ILOAD = 100mA
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND > BLANKING TIME
(SHDN IS TOGGLED)
MAX4836 toc19
VOUT
1V/div
10ms/div
VSHDN
2V/div
VFLAG
2V/div
FLAG CONNECTED TO LOGIC SUPPLY
tBLANK

Partno	Mfg	Dc	Qty	Available	Descript
MAX4837ETT25BD3+ \|MAX4837ETT25BD3	MAXIM	N/a	54	avai	500mA LDO Linear Regulators with Current-Limiting Switch