MAX4826ELT+-MAX4831ELT+-MAX4831ELT+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX4831ELT+T ,50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFNapplications. In addition to the current-limit♦ Fault Flag (FFLG)fault flag (FFLG), an open-drain n ..
MAX4834ETT30C ,250mA LDO Linear Regulators with Current-Limiting SwitchApplicationsMAX4835ETTxy_dd+T -40°C to +85°C 6 TDFN-EP*● SDIO Ports and Devices ● Notebook Computer ..
MAX4835ETT18BD2V+T ,250mA LDO Linear Regulators with Current-Limiting SwitchElectrical Characteristics(V = V + 1V, SHDN = IN, C = 3.3µF, T = -40°C to +85°C, unless otherwise n ..
MAX4837ETT25BD3+ ,500mA LDO Linear Regulators with Current-Limiting SwitchApplicationsMAX4836ETTxy_-T -40°C to +85°C 6 TDFN-6SDIO Ports and Devices Notebook ComputersMAX4837 ..
MAX4838EXT+T ,Overvoltage Protection Controllers with Status FLAGELECTRICAL CHARACTERISTICS(V = +5V (MAX4838–MAX4841), V = +4V (MAX4842), T = -40°C to +85°C, unless ..
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MAX8878EZK36+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
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MAX8878EZK50+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX887EVKIT ,Evaluation Kit for the MAX887features a low-current (2.5µA typ) shutdownV = 3.3V @ I = 0.2AOUT OUTmode, as well as current-mode ..
MAX887HESA ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC ConverterELECTRICAL CHARACTERISTICS(V+ = +7V, PGND = GND = 0V, SHDN = V+, (T = 0°C to T ), unless otherwise ..
MAX887HESA ,100% Duty Cycle, Low-Noise, Step-Down, PWM DC-DC ConverterFeaturesThe MAX887 high-efficiency, step-down DC-DC con-' 95% Efficiency verter provides an adjusta ..

MAX4826ELT+-MAX4831ELT+-MAX4831ELT+T
50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFN
General Description
The MAX4826–MAX4831 family of switches has internal
current limiting to prevent host devices from being
damaged due to faulty load conditions. These analog
switches have a low 0.7Ωon-resistance and operate
from a +2.3V to +5.5V input voltage range. These
devices are available with guaranteed 50mA and
100mA current limits, making them ideal for load-
switching applications. In addition to the current-limit
fault flag (FFLG), an open-drain no-load flag indicator
(NOLD) notifies the system when the current through
the switch is less than 10mA (MAX4826–MAX4829), or
5mA (MAX4830/MAX4831).
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltages settle down. If, after this blanking
time, the load current is greater than the current limit,
the MAX4826/MAX4828/MAX4830 enter a latchoff state
where the switch is turned off, and FFLGis issued to
the microprocessor. The switch can be turned on again
by cycling the power or ON.
The MAX4827/MAX4829/MAX4831 have an autoretry
feature where the switch turns off after the blanking
time, and then continuously checks to see if the over-
load condition is present. The current-limit fault flag
(FFLG) is issued and remains low until after the fault
condition is removed. The switch remains on after the
overload condition disappears.
The MAX4826–MAX4831 operate over the extended
-40°C to +85°C temperature range, and are available in a
tiny space-saving, 1mm x 1.5mm, 6-pin µDFN package.
FeaturesGuaranteed Current Limit: 50mA, 100mAThermal Shutdown ProtectionReverse-Current Protection0.7ΩOn-Resistance (MAX4826–MAX4831)14ms Guaranteed Blanking TimeFault Flag (FFLG)No-Load Flag (NOLD)65µA Supply Current8µA Latchoff Current0.01µA Shutdown Current+2.3V to +5.5V Supply RangeUndervoltage LockoutFast Current-Limit Response Time6-Pin µDFN Package (1mm x 1.5mm)
Applications
GPS Systems
Cell Phones
Digital Still Cameras
PDAs and Palmtop Devices
MP3 Players
MAX4826–MAX4831
50mA/100mA Current-Limit Switches with
NO-LOAD Flag in µDFN
Ordering Information/Selector Guide
19-3672; Rev 1; 8/09
PARTPIN-PACKAGE
MIN FULL-LOAD
LIMIT
(mA)
MAX NO-LOAD
LIMIT
(mA)
ON-RESISTANCE
()
TA = +25°C
MODETOP
MARK
MAX4826ELT+T 6 μDFN 50 10 1 Latchoff AK
MAX4827ELT+T* 6 μDFN 50 10 1 Autoretry AL
MAX4828ELT+T* 6 μDFN 100 10 1 Latchoff AM
MAX4829ELT+T 6 μDFN 100 10 1 Autoretry AN
MAX4830ELT+T 6 μDFN 50 5 2 Latchoff AO
MAX4830ELT/V+T 6 μDFN 50 5 2 Latchoff OX
MAX4831ELT+T* 6 μDFN 50 5 2 Autoretry AP
Note:All devices operate over the -40°C to +85°C operating range.
T = Tape and reel.
*Future product—contact factory for availability.
/V denotes an automotive qualified part.
Pin Configuration appears at end of data sheet.
MAX4826–MAX4831
50mA/100mA Current-Limit Switches with
NO-LOAD Flag in µDFN
ABSOLUTE MAXIMUM RATINGS
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, ON, FFLG, NOLD, OUT to GND.........................-0.3V to +6V
OUT Short Circuit to GND.................................Internally Limited
Continuous Power Dissipation (TA= +70°C)
6-Pin µDFN (derate 2.1mW/°C above +70°C).............168mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS
(VIN= +2.3V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VIN= +3.3V, TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Operating VoltageVIN2.35.5V
VIN = +2.3V to +5.0V65100Quiescent CurrentIQVON = VIN, IOUT =
0, switch onVIN = +5.0V to +5.5V120µA
Latchoff Current (Note 2)ILATCHVON = VIN = 3.3V, after an overcurrent fault
(MAX4826/MAX4828/MAX4830)815µA
Shutdown CurrentISHDNVON = 0, IOUT = 0mA0.011µA
Shutdown Reverse LeakageISHDNRVVON = 0, VIN = +2.3V, VOUT = +5.5V0.011µA
(MAX4826/MAX4827/MAX4830/MAX4831)
RL = 10Ω50120Forward-Current LimitIFWD
(MAX4828/MAX4829) RL = 5Ω100240
VOUT - VIN < 0.5V
(MAX4826/MAX4827/MAX4830/MAX4831)120Reverse-Current LimitIREV
VOUT - VIN < 0.5V (MAX4828/MAX4829)240
MAX4826–MAX48291.010.0No-Load ThresholdINLTHMAX4830/MAX48310.55.0mA
ON Input LeakageIONLKVON = VIN or GND-1+1µA
Off-Switch LeakageISWLKVIN = +5.5V, VON = 0, VOUT = 00.011µA
Undervoltage LockoutUVLORising edge1.82.2V
Undervoltage Lockout HysteresisUVLOHYS100mV
(MAX4826–MAX4829)0.71.0TA = +25°C, IOUT
= 20mA(MAX4830/MAX4831)1.42.0
(MAX4826–MAX4829)1.3On-ResistanceRONTA = -40°C to
+85°C,
IOUT = 20mA(MAX4830/MAX4831)2.6
ON Input-Logic-High VoltageVIH2.0V
ON Input-Logic-Low VoltageVIL0.8V
FFLG, NOLD Output-Logic-Low
VoltageISINK = 1mA0.4V
MAX4826–MAX4831
50mA/100mA Current-Limit Switches with
NO-LOAD Flag in µDFN
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +2.3V to +5.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VIN= +3.3V, TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
FFLG, NOLD Output-High
Leakage CurrentVIN = VFFLG = VNOLD = +5.5V1µA
Thermal Shutdown+150°C
Thermal-Shutdown Hysterisis15°C
DYNAMIC
Turn-On TimeON from low to high; IOUT = 10mA,
CL = 0.1µF (Note 3)50µs
Turn-Off TimeON from high to low; IOUT =10mA,
CL = 0.1µF (Note 3)30ns
Blanking TimetBLANKOvercurrent fault1460ms
Short-Circuit Current-Limit
Response Time
VON = VIN = +3.3V, short circuit applied to
OUT5µs
No-Load-Detection Response
Time
IOUT falling step signal from 15mA to 0mA,
CL = 0.1µF60µs
Retry TimetRETRYOvercurrent fault (Figure 2) (Note 4)196840ms
Note 1:All parts are 100% tested at TA= +25°C. Limits at TA= -40°C to +85°C are guaranteed by design.
Note 2:Latchoff current does not include the current flowing into FFLGand NOLD.
Note 3:Turn-on time is defined as the time taken for the current through the switch to go from 0mA to full load. Turn-off time is
defined as the time taken for the current through the switch to go from full load to 0mA.
Note 4:Retry time is typically 14x the blanking time.
Typical Operating Characteristics
(VIN= +3.3V, TA = +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4826 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
VON = VIN
VIN = +2.3V TO +5.5V
TEMPERATURE (°C)3510-15-4085
QUIESCENT SUPPLY CURRENT
vs. TEMPERATURE
MAX4826 toc02
SUPPLY CURRENT (
VON = VIN
VIN = 5V
VIN = 3.3V
TEMPERATURE (°C)3510-15-4085
LATCHOFF CURRENT
vs. TEMPERATURE
MAX4826 toc03
LATCHOFF CURRENT (
VIN = 5V
VIN = 3.3V
VON = VIN
MAX4826–MAX4831
50mA/100mA Current-Limit Switches with
NO-LOAD Flag in µDFN
Typical Operating Characteristics (continued)
(VIN= +3.3V, TA = +25°C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4826 toc04
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)0.001
VIN = 5V
VIN = 3.3V3510-15-4085
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
MAX4826 toc05
TEMPERATURE (°C)
SHUTDOWN LEAKAGE CURRENT (nA)0.001
VIN = 5V
VIN = 3.3V3510-15-4085
SHUTDOWN REVERSE LEAKAGE CURRENT
vs. TEMPERATURE
MAX4826 toc06
TEMPERATURE (°C)
REVERSE LEAKAGE CURRENT (nA)0.001
VON = VIN = OV
VOUT = 5V
LATCHOFF-LEAKAGE CURRENT
vs. TEMPERATURE
MAX4826 toc07
TEMPERATURE (°C)
LATCHOFF-LEAKAGE CURRENT (nA)0.001
VIN = 5V
VIN = 3.3V3510-15-4085
TEMPERATURE (°C)3510-15-4085
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX4826 toc08
NORMALIZED R
VON = VIN = 3.3V
OUTPUT CURRENT vs. OUTPUT VOLTAGE
MAX4826 toc09
VIN - VOUT (V)
OUTPUT CURRENT (mA)
MAX4828/MAX4829
MAX4826/MAX4827/MAX4830/MAX4831
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
MAX4826 toc10
TURN-ON/OFF TIMES (
ILOAD = -10mA
OFF
VIN = 3.3V VIN = 5V
FFLG-BLANKING TIMEOUT
vs. TEMPERATURE
FFLG-BLANKING TIME (ms)
MAX4826 toc113510-15-4085
MAX4826–MAX4831
Typical Operating Characteristics (continued)
(VIN= +3.3V, TA = +25°C, unless otherwise noted.)
50mA/100mA Current-Limit Switches with
NO-LOAD Flag in µDFN
CURRENT-LIMIT RESPONSE
MAX4826 toc12
40μs/div
VON = 3.3V
VOUT = GND
CIN = 1μF
COUT = 1μF
VIN
2V/div
VON
2V/div
IOUT
100mA/div
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
MAX4826 toc14
40μs/div
VIN
2V/div
VOUT
2V/div
IOUT
2A/div
CURRENT-LIMIT RESPONSE
MAX4826 toc13
20μs/div
VON = 3.3V
VOUT = GND
CIN = 1μF
COUT = 1μF
VIN = VON
1V/div
IOUT
100mA/div
SWITCH TURN-ON-TIME RESPONSE
MAX4826 toc15
100μs/div
VIN = 3.3V
ILOAD = 10mA
VON
2V/div
IOUT
100mA/div
SWITCH TURN-OFF-TIME RESPONSE
MAX4826 toc16
100ns/div
VON
2V/div
IOUT
10mA/div
VIN = 3.3V
ILOAD = 10mA
FFLG-BLANKING RESPONSE
MAX4826 toc17
4ms/div
VIN
2V/div
VON
2V/div
IOUT
100mA/div
FFLG
2V/div
MAX4826–MAX4831
Detailed Description
The MAX4826–MAX4831 are forward-/reverse-current-
limited switches that operate from a +2.3V to +5.5V
input voltage range and guarantee a 50mA and 100mA
minimum current-limit threshold for different options.
The voltage drop across an internal sense resistor is
compared to two reference voltages to indicate a for-
ward- or reverse-current-limit fault. When the load cur-
rent exceeds the preset current limit for greater than
the fault-blanking time, the switch opens.
The MAX4827/MAX4829/MAX4831 have an autoretry
function that turns on the switch again after an internal
retry time expires. If the faulty load condition is still pre-
sent after the blanking time, the switch turns off again
and the cycle is repeated. If the faulty load condition is
not present, the switch remains on.
The MAX4826/MAX4828/MAX4830 do not have the
autoretry option, and the switch remains in latchoff mode
until ON or the input power is cycled from high to low
and then high again.
The undervoltage lockout (UVLO) circuit prevents erro-
neous switch operation when the input voltage goes too
low during startup conditions.
Reverse-Current Protection
The MAX4826–MAX4831 limit the reverse current (VOUT
to VIN) from exceeding the maximum IREVvalue. The
switch is shut off and FFLGis asserted if the reverse-
current-limit condition persists for more than the blank-
ing time. This feature prevents excessive reverse cur-
rents from flowing through the device.
Switch-On/Off Control
Toggle ON high to enable the current-limited switches.
The switches are continuously on only if VINexceeds
the UVLO threshold (typically 2V) and there is no fault.
When a forward-/reverse-current fault is present or the
die exceeds the thermal-shutdown temperature of
+150°C, OUT is internally disconnected from IN, and
the supply current decreases to 8µA (latchoff). The
switch is now operating in one of its off states. The
switch off state also occurs when driving ON low, thus
reducing the supply current (shutdown) to 0.01µA.
Table 1 illustrates the ON/OFF state of the MAX4826–
MAX4831 current-limit switches.
50mA/100mA Current-Limit Switches with
NO-LOAD Flag in µDFN
Pin Description
PINNAMEFUNCTIONINInput. Bypass IN with a 0.1µF ceramic capacitor to ground.GNDGroundOUTSwitch Output. Bypass OUT with a 0.1µF capacitor to groundFFLG
Current-Limit Fault Output. FFLG is an open-drain output. FFLG goes low when the device stays in
forward- or reverse-current limit for more than the blanking time period. FFLG is high impedance
when a fault is not present or when ON is low.NOLD
No-Load Flag Output. NOLD is an open-drain output. NOLD goes low when a load of less than 10mA
(MAX4826–MAX4829) or 5mA (MAX4830/MAX4831) is delivered to the output. NOLD is high
impedance when a fault is not present or when ON is low.ONActive-High Switch-On Input. Drive ON high to turn the switch on.FAULTSWITCH ON/OFFSUPPLY CURRENT MODE
Low X OFF Shutdown
High Undervoltage lockout OFF Latchoff
High Thermal OFF immediately (tBLANK period does not apply). Latchoff
OFF after tBLANK period has elapsed. Latchoff
High Current limit ON during tBLANK period, OFF during tRETRY period for the
MAX4827/MAX4829/MAX4831. Cycle repeats until fault is
removed.
See the Autoretry (MAX4827/
MAX4829/MAX4831) section
Table 1. MAX4826–MAX4831 Switch Truth Table

Partno	Mfg	Dc	Qty	Available	Descript
MAX4826ELT+	MAXIM	N/a	700	avai	50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFN
MAX4831ELT+	MAXIM	N/a	2600	avai	50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFN
MAX4831ELT+T	MAX	N/a	5000	avai	50mA/100mA Current-Limit Switches with NO-LOAD Flag in µDFN