MAX4834/MAX4835
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 specified 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.
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
Ordering Information
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.
TEMP RANGE
PIN-PACKAGE
MAX4834EUTxy_+T*
-40°C to +85°C
6 SOT23
MAX4834ETTxy_+T
-40°C to +85°C
6 TDFN-EP*
Applications
MAX4835EUTxy_dd+T*
-40°C to +85°C
6 SOT23
MAX4835ETTxy_dd+T
-40°C to +85°C
6 TDFN-EP*
●● SDIO Ports and Devices
●● Notebook Computers
●● USB Ports and Devices
●● Cell Phones
●● PDAs and Palmtop Devices ●● GPS Systems
Pin Configurations
TOP VIEW
+
IN
1
GND
2
SHDN
3
MAX4834/MAX4835
( ) MAX4834ETTxyC ONLY.
EXPOSED PAD
6
OUT
5
SS
4
RESET
(FLAG)
TDFN
Pin Configurations continued at end of data sheet.
19-3373; Rev 2; 4/15
PART
Note: “xy” are placeholders for the output voltage levels of the
devices. Insert the values found in Table 1 at the end of this document 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 voltage, 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 minimum 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.
Tables 1 and 2 and Selector Guide appear at end of data
sheet.
MAX4834/MAX4835
250mA LDO Linear Regulators
with Current-Limiting Switch
Absolute Maximum Ratings
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)...........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
Soldering Temperature (reflow)........................................+260°C
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.
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)
PARAMETER
Operating Voltage
Input Undervoltage Lockout
Threshold
Input Undervoltage Lockout
Threshold Hysteresis
Quiescent Current
SYMBOL
CONDITIONS
VIN
VUVLO
VIN rising
MIN
MAX
UNITS
2.5
5.5
V
2.00
2.25
V
50
IQ
SHDN = IN, IOUT = 0A
SHDN = IN, IOUT = 0A,
VUVLO < VIN < VOUT (nominal)
90
Dropout Voltage (Note 2)
IOUT = 250mA
TA = +25°C
IOUT = 1mA to 250mA, TA = -40°C to +85°C
IOUT
VOUT = 0V
Reverse Current at VIN
VOUT = 5.5V, VIN = 0V to VOUT
2
103
140
165
-1.3
+1.3
-2
+2
CSS = 0.01µF
CSS = 0.1µF
TA = +25°C
mV
%VNOM
mA
270
CSS = not connected
tSS
µA
250
Output Current Limit
Soft-Start Time (Note 3)
150
0.1
TA = -40°C to +85°C
IOUT = 1mA to 250mA, TA = +25°C
Output Voltage Accuracy
mV
150
SHDN = GND, IOUT = 0A
Output Current
TYP
330
mA
µA
0.1
2
0.5
1
2.0
4
10
15
40
100
150
-0.04
+0.02
+0.065
-0.05
+0.03
+0.08
ms
Line Regulation (Note 4)
VOUT + 0.5V < VIN <
5.5V, ILOAD = 100µA
Load Regulation
100µA < ILOAD < 250mA, VIN = VOUT + 1V
1.3
%VNOM
Output Noise
10Hz to 100kHz, CSS = 0.01µF
70
µVRMS
SHUTDOWN INPUT (SHDN)
OUT Discharge Resistance in
Shutdown (MAX4835)
SHDN Input-Voltage High
SHDN = GND
900
W
VIH
SHDN Input-Voltage Low
VIL
TA = -40°C to +85°C
1.4
SHDN Input Leakage Current
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V
0.5
SHDN Input Hysteresis
30
SHDN = IN or GND
-100
%VNOM/V
V
mV
+100
nA
Maxim Integrated │ 2
MAX4834/MAX4835
250mA LDO Linear Regulators
with Current-Limiting Switch
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)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RESET OUTPUT (MAX4835)
RESET Threshold
OUT Drop to RESET Delay
(Note 5)
VRESET
0.85 x 0.875 x 0.90 x
VOUT VOUT VOUT
V
tOR
35
µs
D1 timing option
RESET Timeout Period
tRESET
RESET Output-Voltage Low
FLAG OUTPUT (MAX4834)
Blanking Time (Note 6)
tBLANK
3.75
5.0
D2 timing option
20
30
40
D3 timing option
150
225
300
D4 timing option
1200
1800
2400
VOUT ≥ 1.0V, ISINK = 50µA, RESET
asserted
0.3
VOUT ≥ 1.5V, ISINK = 3.2mA, RESET
asserted
0.4
VOUT ≥ 2.0V, ISOURCE ≤ 500µA,
RESET deasserted
RESET Output-Voltage High
2.5
VOUT + 1V ≤ VIN ≤ 5.5V, OUT = GND
ms
V
0.8 x
VOUT
5
V
10
17
ms
0.4
V
1
µA
Open-Drain FLAG OutputVoltage Low
ISINK = 3.2mA, FLAG asserted, VOUT ≥ 1.5V
Open-Drain FLAG Leakage
Current
VFLAG = 5.5V
0.01
Junction temperature rising
+165
°C
15
°C
THERMAL PROTECTION
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
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.
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Maxim Integrated │ 3
MAX4834/MAX4835
250mA 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
(250mA LOAD)
TA = -40°C
VOUT = 1.5V
1
2
3
4
5
TA = -40°C
45
30
15
0
1
2
3
4
5
0
6
VIN = 3.5V
VOUT = 2.5V
1
100
10
VIN (V)
RESET THRESHOLD OVERDRIVE (mV)
DROPOUT VOLTAGE
vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
REGION OF STABLE COUT ESR
vs. LOAD CURRENT
0
VOUT = 2V
COUT = 3.3µF
ILOAD = 20mA
-10
-20
40
-30
-40
-50
150
200
-80
250
0.01
0.1
OUTPUT NOISE (µVRMS)
1
0
100
10
0
50
FREQUENCY (kHz)
150
200
250
MAX4834 toc08
MAX4834 toc07
VIN = 3V
VOUT = 1.8V
CSS = 10nF
ILOAD = 0
100
LOAD CURRENT (mA)
SOFT-START RESPONSE
(CSS = UNCONNECTED)
OUTPUT NOISE vs. FREQUENCY
40
STABLE REGION
3
1
LOAD CURRENT (mA)
50
4
2
-70
100
COUT = 3.3µF
5
-60
20
VOUT = 1.8V
6
COUT ESR (Ω)
PSRR (dB)
60
7
MAX4834 toc05
80
50
60
VIN (V)
VOUT = 3.3V
0
RESET ASSERTS
ABOVE THIS LINE
MAX4834 toc03
75
VOUT = 3.3V
0
6
MAX4834 toc04
0
100
DROPOUT VOLTAGE (mV)
90
100
20
0
TA = +25°C
200
40
0
300
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX4834 toc06
60
IQ (µA)
IQ (µA)
400
TA = +25°C
80
TA = +85°C
PULSE DURATION (µs)
TA = +85°C
100
500
MAX4834 toc01
120
MAX4834 toc02
QUIESCENT CURRENT vs. INPUT VOLTAGE
(NO LOAD)
VOUT = 3.3V
VIN
2V/div
30
20
tSS
VOUT
2V/div
10
0
VSS
1V/div
10
100
1k
10k
100k
2ms/div
FREQUENCY (Hz)
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Maxim Integrated │ 4
MAX4834/MAX4835
250mA 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.)
SOFT-START RESPONSE
(CSS = 0.01µF)
SOFT-START RESPONSE
(CSS = 0.1µF)
LOAD-TRANSIENT RESPONSE
MAX4834 toc10
MAX4834 toc09
MAX4834 toc11
VIN
2V/div
VIN
2V/div
tSS
VOUT
2V/div
VOUT
2V/div
tSS
VIN = 4.3V
VOUT = 3.3V
CIN = 0.1µF
COUT = 3.3µF
ILOAD: STEP FROM 10mA TO 100mA
BACK TO 10mA
VSS
1V/div
VSS
1V/div
20ms/div
2ms/div
LOAD-TRANSIENT RESPONSE
NEAR DROPOUT
100µs/div
RESET RESPONSE TO VIN
LINE-TRANSIENT RESPONSE
MAX4834 toc12
VIN = 3.4V
VOUT = 3.3V
CIN = 0.1µF
COUT = 3.3µF
ILOAD: STEP FROM 10mA TO 100mA
BACK TO 10mA
VOUT
50mV/div
AC-COUPLED
MAX4834 toc13
MAX4834 toc14
CSS = UNCONNECTED
VOUT
50mV/div
AC-COUPLED
CIN = 0.1µF
COUT = 3.3µF
VOUT = 3.3V
ILOAD = 10mA
100µs/div
5V
VIN
500mV/div
4.5V
VIN
2V/div
VOUT
50mV/div
AC-COUPLED
VOUT
2V/div
tRESET
100µs/div
VRESET
2V/div
40ms/div
RESET RESPONSE TO SHUTDOWN
RESET RESPONSE TO VOUT
MAX4834 toc16
MAX4834 toc15
VIN = 3.5V, CSS = UNCONNECTED
VIN = 3.5V, CSS = UNCONNECTED
VSHDN
2V/div
VOUT
1V/div
VOUT
2V/div
tRESET
40ms/div
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VRESET
1V/div
tRESET
VRESET
2V/div
40ms/div
Maxim Integrated │ 5
MAX4834/MAX4835
250mA 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
(IN IS TOGGLED)
MAX4834 toc17
MAX4834 toc18
VOUT
1V/div
IOUT
200mA/div
tBLANK
VOUT
1V/div
VFLAG
2V/div
VIN
2V/div
VSHDN
2V/div
FLAG CONNECTED TO LOGIC SUPPLY
10ms/div
STARTUP IN AN OVERLOAD CONDITION
(CSS NOT CONNECTED)
10ms/div
STARTUP IN AN OVERLOAD CONDITION
(CSS = 0.01µF)
VIN
2V/div
tBLANK
2ms/div
VOUT = 2.5V
ILOAD = ILIMIT MAXIMUM
FLAG CONNECTED TO LOGIC SUPPLY
NORMALIZED OUTPUT VOLTAGE
vs. TEMPERATURE
MAX4834 toc21
VOUT
2V/div
VIN
2V/div
tSS
tBLANK
VOUT
2V/div
VFLAG
2V/div
VFLAG
2V/div
VSS
1V/div
VSS
1V/div
4ms/div
VOUT = 2.5V
ILOAD = ILIMIT MAXIMUM
FLAG CONNECTED TO LOGIC SUPPLY
1.004
NORMALIZED OUTPUT VOLTAGE
MAX4834 toc20
VFLAG
2V/div
tBLANK
FLAG CONNECTED TO LOGIC SUPPLY
1ms/div
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MAX4834 toc19
VOUT
1V/div
VFLAG
2V/div
tSS
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND > BLANKING TIME
(SHDN IS TOGGLED)
MAX4834 toc22
FLAG RESPONSE WHEN OUT IS
SHORTED TO GND < BLANKING TIME
NORMALIZED TO +25°C
1.002
ILOAD = 250mA
1.000
ILOAD = 10mA
0.998
ILOAD = 100mA
0.996
0.994
-40
-15
10
35
60
85
TEMPERATURE (°C)
Maxim Integrated │ 6
MAX4834/MAX4835
250mA LDO Linear Regulators
with Current-Limiting Switch
Pin Description
PIN
NAME
SOT23
TDFN
1
1
IN
2
2
GND
3
3
SHDN
FUNCTION
Regulator Power Input. Bypass IN to GND with a 0.1µF ceramic capacitor. Install the bypass
capacitor as close as possible to the device.
Ground
Active-Low Shutdown Input. Drive SHDN low to shutdown the regulator. Drive SHDN high or
connect to IN for normal operation.
Overcurrent Flag. Open-drain FLAG goes low when the device senses sustained current
FLAG
Exceeding the current-limit threshold for a duration longer than the blanking time. FLAG is high
(MAX4834)
when SHDN is low or the device is in thermal shutdown.
4
4
5
5
SS
Soft-Start Control. Connect a capacitor (CSS) from SS to GND to program the output rise time at
startup. No capacitor from SS to GND gives 1ms output rise time at startup. See the soft-start
response time plots in the Typical Operating Characteristics.
6
6
OUT
Regulator Output. Bypass OUT to GND with a 3.3µF or larger ceramic capacitor. The capacitor’s
ESR should be less than 0.2W for stable operation.
—
—
EP
Exposed Pad (TDFN only). EP is internally connected to GND. Externally connect EP to GND to
provide a low thermal resistance path from the IC junction to the PCB.
Active-Low Reset Output. Push-pull RESET goes low when the voltage at OUT is below the reset
RESET
threshold or when the voltage at OUT is greater than IN. RESET is low when SHDN is low or the
(MAX4835) device is in thermal shutdown. After the reset condition terminates, RESET remains low for the
duration of the reset timeout period.
Detailed Description
RESET Output (MAX4835)
The MAX4834/MAX4835 are ultra-low quiescent current,
low-dropout linear regulators with an integrated current
limiter. These devices guarantee up to 250mA drive capabilities and regulate the preset output voltage.
The RESET output asserts when one of the following
conditions occurs:
The MAX4834 has a flag output that asserts low when
the load current exceeds the current limit for more
than the blanking time (tBLANK). The MAX4835 has a
reset output that asserts low when the regulator output
voltage is below the reset threshold voltage (VRESET).
VRESET is 87.5% of the nominal output voltage. Figure
1 shows the simplified functional diagram and Figure 2
shows the typical application circuits.
●● The output voltage (VOUT) is below the reset threshold (VRESET).
FLAG Output (MAX4834)
The open-drain FLAG output goes low and the LDO’s
pass transistor is latched off when the current in the pass
transistor is at its output current limit for more than the
blanking time (tBLANK). Cycling IN or SHDN (high to low
to high) brings the device out of its latched-off state and
back into normal operation.
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●● The input voltage (VIN) is below the input undervoltage lockout threshold (VUVLO).
●● SHDN is pulled low.
●● The device is in thermal shutdown.
●● When VOUT > VIN.
RESET remains low for the reset timeout period (tRESET)
after reset conditions are terminated. There are four
RESET timeout periods available as shown in the
Electrical Characteristics table. RESET is available in a
push-pull configuration as shown in the Selector Guide.
Shutdown
Pull SHDN low to shut down the LDO and reduce the
quiescent current consumption of the device from 90µA
to 0.1µA. In shutdown mode, the pass transistor, control
circuit, and reference circuit are turned off. Connect
SHDN to a supply voltage greater than VIH to turn on
the LDO.
Maxim Integrated │ 7
MAX4834/MAX4835
250mA LDO Linear Regulators
with Current-Limiting Switch
THERMAL
PROTECTION
PASS
REVERSETRANSISTOR
CURRENT
PROTECTION
ERROR
AMPLIFIER VSS
IN
OVERLOAD
PROTECTION
MAX4834/MAX4835
OUT
MAX4835 ONLY
900Ω
vFB
SWITCH
CLOSED IN
SHUTDOWN
VREF
1.23V
SHDN
VREF
RESET
(FLAG)
VREF
SWITCH OPEN
DURING SOFT-START
VFB
RESET TIMEOUT
VSS = VREF
WHEN SOFT-START
IS COMPLETE
90% x VREF
1.23µA
VSS
SS
(BLANKING PERIOD)
1nF
GND
( ) MAX4834E_ _xyC ONLY.
Figure 1. Functional Diagram
IN
2.5V TO 5.5V
CIN
0.1µF
IN
OUT
COUT
3.3µF
VLOGIC
2.5V TO 5.5V
LOAD
COUT
3.3µF
MAX4834
TO µC
TO µC
SS
RESET
CSS
ON
OFF
SHDN
CSS
ON
GND
LOAD
MAX4835
SS
FLAG
OUT
CIN
0.1µF
OFF
SHDN
GND
Figure 2. Typical Application Circuits
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Maxim Integrated │ 8
MAX4834/MAX4835
Shutdown Discharge (MAX4835)
OUT discharges through a 900Ω internal resistor during
shutdown mode.
Reverse OUT to IN Current
When the output voltage is greater than the input voltage,
the internal pass transistor turns off. To avoid reversecharging the input source, the current at IN is guaranteed
to be below 3µA when VOUT ≥ VIN.
Current Limit
The MAX4834/MAX4835 include an accurate internal
current-limiting circuit. OUT can be shorted to ground
indefinitely without damaging the part.
The MAX4834 latches off if the load current exceeds
the current limit for more than the blanking time (see the
FLAG Output section). During soft-start, the device does
not latch off to an overload condition. During an overload
condition, the MAX4835 holds the current at current limit
until the thermal limit is reached. Once the junction temperature reaches +165°C, thermal shutdown occurs.
Thermal Shutdown
When the junction temperature (TJ) exceeds +165°C,
the LDO’s pass transistor turns off allowing the junction
to cool. The LDO’s pass transistor turns on again after
the IC’s junction temperature cools by 15°C, resulting
in a pulsed output during continuous thermal overload
conditions.
Soft-Start
During power-up, the soft-start ensures that the output
ramps up slowly reducing inrush current peaks. See the
soft-start response time plots in the Typical Operating
Characteristics. The soft-start time (tSS) is given by the
following equation:
tSS = CSS (ms)
where CSS is in nF.
A soft-start capacitor (CSS) of 10nF gives a 10ms tSS. A
1ms minimum soft-start time is fixed internally to ensure
that the output rises slowly even without any external
capacitor at SS pin to ground. The device is in soft-start
mode when either the voltage at IN or SHDN is cycled
high to low to high.
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250mA LDO Linear Regulators
with Current-Limiting Switch
Applications Information
Capacitor Selection and Regulator Stability
For stable operation over the full temperature range
and with load currents up to 250mA, use a 3.3µF (min)
ceramic output capacitor with an ESR < 0.2Ω. To reduce
noise and improve load transient response, stability,
and power-supply rejection, use larger output capacitor
values such as 10µF (note that some ceramic capacitors
exhibit large capacitance and ESR variation with temperature). X7R capacitors provide good performance over the
-40°C to +85°C operating temperature range.
To improve power-supply rejection and transient response,
use a 0.1µF capacitor between IN and GND. The
MAX4834/MAX4835 remain stable with purely resistive
loads or current loads up to 250mA.
15kV Operational ESD Protection
A 3.3µF or higher value ceramic capacitor from OUT to
GND provides a 15kV (Human Body Model) protection
at OUT. The ESR value of the capacitor should be less
than 0.2Ω.
Reset Transient Immunity
The reset circuit is relatively immune to short
duration, falling VOUT transients. The Typical Operating
Characteristics show a graph of the Maximum Transient
Duration vs. Reset Threshold Overdrive for which reset
is not asserted. The graph was produced using falling
VOUT transients starting at VOUT and ending below the
reset threshold by the magnitude indicated (reset threshold overdrive). The graph shows the maximum pulse
width that a falling VOUT transient can typically have
without triggering the reset pulse. As the amplitude of the
transient increases (i.e., goes further below the
reset threshold), the maximum allowable pulse width
decreases. Typically, a VOUT transient that goes only
10mV below the reset threshold and lasts up to 54µs does
not trigger a reset pulse.
Layout
When using the TDFN package, connect its exposed pad
to GND to provide a low thermal-resistance path for heat
transfer from the IC junction to the PCB.
Maxim Integrated │ 9
MAX4834/MAX4835
250mA LDO Linear Regulators
with Current-Limiting Switch
Selector Guide
PART
MAX4834EUTxyC+T
PINPACKAGE
6 SOT23
OUTPUT
RESET OUTPUT
CURRENT (mA) CONFIGURATION
250
Open-Drain
RESET (FLAG)
SHUTDOWN
DISCHARGE
LATCH OFF
FLAG
No
Yes
MAX4834ETTxyC+T
6 TDFN
250
Open-Drain
FLAG
No
Yes
MAX4835EUTxyBdd+T
6 SOT23
250
Push-Pull
RESET
Yes
No
MAX4835ETTxyBdd+T
6 TDFN
250
Push-Pull
RESET
Yes
No
Suffix ‘xy’ in the part number stands for nominal output voltage. 1.8V, 2.5V, 2.8V, 3.0V, 3.3V are the standard options. For other voltages
between 1.5V to 3.3V, contact factory.
Table 1. Standard Output Voltage Suffix
Guide
xy
OUTPUT VOLTAGE (V)
18
1.8
25
2.5
28
2.8
30
3.0
33
3.3
Pin Configurations (continued)
TOP VIEW
+
IN 1
GND 2
SHDN 3
dd
RESET TIMEOUT (ms)
D1
3.75
D2
30
D3
225
D4
1800
OUT
5
SS
4
RESET
(FLAG)
SOT23
( ) MAX4834EUTxyC ONLY.
Nonstandard output voltages from 1.5V to 3.3V are available in
100mV increments. Contact factory for availability.
Table 2. RESET Timeout Period Suffix
Guide
MAX4834/
MAX4835
6
Chip Information
PROCESS: BiCMOS
TDFN Exposed Pad: Connected to GND
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
www.maximintegrated.com
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
LAND
NO.
PATTERN NO.
6 SOT23
U6F+6
21-0058
90-0175
6 SOT23
T633+2
21-0137
90-0058
Maxim Integrated │ 10
MAX4834/MAX4835
250mA LDO Linear Regulators
with Current-Limiting Switch
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
7/04
Initial release
1
8/11
Added MAX4835ETT18BD2/V+T and lead-free versions of all parts to the
Ordering Information and Selector Guide
1, 10
2
4/15
Deleted MAX4835ETT18BD2/V+T from Ordering Information and Selector Guide
1, 10
DESCRIPTION
—
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2015 Maxim Integrated Products, Inc. │ 11
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