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MAX4834ETT30CMAXIMN/a10avai250mA LDO Linear Regulators with Current-Limiting Switch
MAX4835ETT18BD2V+TMAXIMN/a2583avai250mA LDO Linear Regulators with Current-Limiting Switch


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MAX4834ETT30C-MAX4835ETT18BD2V+T
250mA LDO Linear Regulators with Current-Limiting Switch
General Description
The MAX4834/MAX4835 family of low-dropout (LDO)
linear regulators feature an accurate current-limiting
switch with an integrated FLAG or RESET function. These
devices operate from 2.5V to 5.5V and deliver up to
250mA of load current at a preset output voltage. Preset
output voltage levels are 1.8V/2.5V/2.8V/3.0V/3.3V.
The MAX4834/MAX4835 offer a programmable soft-start
control function to eliminate false reset during startup.
The MAX4834 provides a FLAG function to notify the
system when the load current exceeds the limit. The
MAX4835 provides a RESET function to notify the system
when the output drops below the threshold. Additionally,
reverse-current protection prevents current flowing from
the output to the input. Other features include a low 90µA
quiescent current, a 0.1µA shutdown current.
The MAX4834/MAX4835 are available in space-saving
6-pin SOT23 and TDFN packages. Each device is spec-
ified over the -40°C to +85°C extended temperature
range. Contact factory for other programmed output
voltage 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 500mA
versions of this device, refer to the MAX4836/MAX4837.
Applications
Features
●Guaranteed Minimum 250mA Load Current●Accurate Current Limit●Preset Output Voltages: 1.8V/2.5V/2.8V/3.0V/3.3V●2.5V to 5.5V Supply Voltage Range●Adjustable Soft-Start●Low Dropout Voltage●Thermal Shutdown●Reverse-Current Protection●Shutdown Output Discharge (MAX4835)●Low 90µA Supply Current●Ultra-Low 0.1µA Shutdown Current●FLAG and Latch Off (MAX4834) or RESET
(MAX4835)●Tiny SOT23 and TDFN (3mm x 3mm) Packages
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
RESET or the FLAG feature. Insert “B” in the place of “_” for
RESET and “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, MAX4835EUT18BD2 has a 1.8V output volt-
age, RESET feature, and a 30ms reset timeout period. Note that
“dd” applies only to the devices with RESET option and does not
apply to the devices with FLAG option. For devices with the
FLAG option, 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.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGE
MAX4834EUTxy_+T*
-40°C to +85°C6 SOT23
MAX4834ETTxy_+T-40°C to +85°C6 TDFN-EP*
MAX4835EUTxy_dd+T*-40°C to +85°C6 SOT23
MAX4835ETTxy_dd+T
-40°C to +85°C6 TDFN-EP* ●SDIO Ports and Devices●USB Ports and Devices●PDAs and Palmtop Devices●Notebook Computers●Cell Phones●GPS SystemsOUTSSGNDSHDN
MAX4834/MAX4835
TDFN

EXPOSED PAD
TOP VIEW
( ) MAX4834ETTxyC ONLY.
RESET
(FLAG)
MAX4834/MAX4835250mA LDO Linear Regulators
with Current-Limiting Switch
Tables 1 and 2 and Selector Guide appear at end of data
sheet.
Ordering Information

Pin Configurations continued at end of data sheet.
Pin Conigurations
IN, SHDN, FLAG, OUT to GND ..............................-0.3V to +6V
RESET to 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) ..........727mW6-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
Soldering Temperature (reflow) .......................................+260°C
(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

Operating VoltageVIN2.55.5V
Input Undervoltage Lockout
ThresholdVUVLOVIN rising2.002.25V
Input Undervoltage Lockout
Threshold Hysteresis50mV
Quiescent CurrentIQ
SHDN = IN, IOUT = 0A90150SHDN = IN, IOUT = 0A,
VUVLO < VIN < VOUT (nominal)150
SHDN = GND, IOUT = 0A0.12
Dropout Voltage (Note 2)IOUT = 250mATA = +25°C103140mVTA = -40°C to +85°C165
Output Voltage AccuracyIOUT = 1mA to 250mA, TA = +25°C-1.3+1.3%VNOMIOUT = 1mA to 250mA, TA = -40°C to +85°C-2+2
Output CurrentIOUT250mA
Output Current LimitVOUT = 0V270330mA
Reverse Current at VINVOUT = 5.5V, VIN = 0V to VOUT0.12µA
Soft-Start Time (Note 3)tSS
CSS = not connected0.512.0CSS = 0.01µF41015
CSS = 0.1µF40100150
Line Regulation (Note 4)VOUT + 0.5V < VIN <
5.5V, ILOAD = 100µA
TA = +25°C-0.04+0.02+0.065%VNOM/VTA = -40°C to +85°C-0.05+0.03+0.08
Load Regulation100µA < ILOAD < 250mA, VIN = VOUT + 1V1.3%VNOM
Output Noise10Hz to 100kHz, CSS = 0.01µF70µVRMS
SHUTDOWN INPUT (SHDN)

OUT Discharge Resistance in
Shutdown (MAX4835)SHDN = GND900W
SHDN Input-Voltage HighVIH1.4V
SHDN Input-Voltage LowVIL0.5V
SHDN Input Hysteresis30mV
MAX4834/MAX4835250mA LDO Linear Regulators
with Current-Limiting Switch
Electrical Characteristics

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.
Absolute Maximum Ratings
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 VIN to VOUT when VOUT is 2% below its nominal value. The nominal output voltage

is measured from VOUT to GND when VIN is 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, VIN must 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

FLAG issued is tSS + tBLANK.
(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 (MAX4835)

RESET ThresholdVRESET0.85 x
VOUT
0.875 x
VOUT
0.90 x
VOUTV
OUT Drop to RESET Delay
(Note 5)tOR35µs
RESET Timeout PeriodtRESET
D1 timing option2.53.755.0D2 timing option203040
D3 timing option150225300
D4 timing option120018002400
RESET Output-Voltage Low
VOUT ≥ 1.0V, ISINK = 50µA, RESET
asserted0.3VOUT ≥ 1.5V, ISINK = 3.2mA, RESET
asserted0.4
RESET Output-Voltage HighVOUT ≥ 2.0V, ISOURCE ≤ 500µA,
RESET deasserted
0.8 x
VOUTV
FLAG OUTPUT (MAX4834)

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
MAX4834/MAX4835250mA LDO Linear Regulators
with Current-Limiting Switch
Electrical Characteristics (continued)
(VIN = VOUT + 1V, SHDN = IN, COUT = 3.3µF, TA = +25°C, unless otherwise noted.)
SOFT-START RESPONSE
(CSS = UNCONNECTED)

MAX4834 toc08
VSS
1V/div
VOUT
2V/div
VIN
2V/div
2ms/div
tSS
VOUT = 3.3V
OUTPUT NOISE vs. FREQUENCY

MAX4834 toc07
OUTPUT NOISE (
RMS
10k1k100100k
VIN = 3V
VOUT = 1.8V
CSS = 10nF
ILOAD = 0
REGION OF STABLE COUT ESR
vs. LOAD CURRENT

MAX4834 toc06
LOAD CURRENT (mA)
OUT
ESR (
VOUT = 1.8V
COUT = 3.3µF
STABLE REGION
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY

MAX4834 toc05
FREQUENCY (kHz)
PSRR (dB)10.1
VOUT = 2V
COUT = 3.3µF
ILOAD = 20mA
DROPOUT VOLTAGE
vs. LOAD CURRENT

MAX4834 toc04
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
VOUT = 3.3V
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE

MAX4834 toc03
RESET THRESHOLD OVERDRIVE (mV)
PULSE DURATION (100
RESET ASSERTS
ABOVE THIS LINE
VIN = 3.5V
VOUT = 2.5V
QUIESCENT CURRENT vs. INPUT VOLTAGE
(250mA LOAD)

MAX4834 toc02
VIN (V)432106
TA = +85°C
TA = +25°C
VOUT = 3.3V
TA = -40°C
QUIESCENT CURRENT vs. INPUT VOLTAGE
(NO LOAD)

MAX4834 toc01
VIN (V)4321
TA = +85°C
TA = -40°C
TA = +25°C
VOUT = 1.5V
MAX4834/MAX4835250mA LDO Linear Regulators
with Current-Limiting Switch
Typical Operating Characteristics
(VIN = VOUT + 1V, SHDN = IN, COUT = 3.3µF, TA = +25°C, unless otherwise noted.)
RESET RESPONSE TO SHUTDOWN

MAX4834 toc16
VRESET
2V/div
VOUT
2V/div
VSHDN
2V/div
40ms/div
tRESET
VIN = 3.5V, CSS = UNCONNECTED
RESET RESPONSE TO VOUT

MAX4834 toc15
VRESET
1V/div
VOUT
1V/div
40ms/div
tRESET
VIN = 3.5V, CSS = UNCONNECTED
RESET RESPONSE TO VIN

MAX4834 toc14
VRESET
2V/div
VOUT
2V/div
VIN
2V/div
40ms/div
tRESET
CSS = UNCONNECTED
LINE-TRANSIENT RESPONSE

MAX4834 toc13
VOUT
50mV/div
AC-COUPLED
100µs/div
CIN = 0.1µF
COUT = 3.3µF
VOUT = 3.3V
ILOAD = 10mA
VIN
500mV/div
4.5V
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT

MAX4834 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
LOAD-TRANSIENT RESPONSE

MAX4834 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
SOFT-START RESPONSE
(CSS = 0.1µF)

MAX4834 toc10
VIN
2V/div
VSS
1V/div
VOUT
2V/div
20ms/div
tSS
SOFT-START RESPONSE
(CSS = 0.01µF)

MAX4834 toc09
VSS
1V/div
VOUT
2V/div
VIN
2V/div
2ms/div
tSS
MAX4834/MAX4835250mA 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.)
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE

MAX4834 toc22
TEMPERATURE (°C)
NORMALIZED OUTPUT VOLTAGE3510-15
NORMALIZED TO +25°C
ILOAD = 250mA
ILOAD = 100mA
ILOAD = 10mA
STARTUP IN AN OVERLOAD CONDITION
(CSS = 0.01µF)

MAX4834 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
STARTUP IN AN OVERLOAD CONDITION
(CSS NOT CONNECTED)

MAX4834 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
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND > BLANKING TIME
(SHDN IS TOGGLED)

MAX4834 toc19
VOUT
1V/div
10ms/div
VSHDN
2V/div
VFLAG
2V/div
FLAG CONNECTED TO LOGIC SUPPLY
tBLANK
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND > BLANKING TIME
(IN IS TOGGLED)

MAX4834 toc18
VOUT
1V/div
10ms/div
VIN
2V/div
VFLAG
2V/div
tBLANK
FLAG CONNECTED TO LOGIC SUPPLY
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND < BLANKING TIME

MAX4834 toc17
VOUT
1V/div
1ms/div
IOUT
200mA/div
VFLAG
2V/div
MAX4834/MAX4835250mA LDO Linear Regulators
with Current-Limiting Switch
Typical Operating Characteristics (continued)
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