MAX4772ETT+ Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX4772ETT+
200mA/500mA Selectable Current-Limit Switches
General Description
The MAX4772/MAX4773 switches feature selectable
internal current limiting to prevent damage to host
devices due to faulty load conditions. The
MAX4772/MAX4773 include a logic input to select a
guaranteed 200mA or 500mA current limit, making them
ideal for SDIO and other load-switching applications.
These analog switches have a low 0.2Ωon-resistance
and operate from a 2.0V to 4.5V input voltage range.
When the switch is on and a load is connected to the
port, a guaranteed blanking time of 14ms ensures that
the transient voltage settles down. If, after this blanking
time, the load current is greater than the current limit,
the MAX4772 switch is turned off and issues a FLAGto
the microprocessor. The switch can be turned on again
by cycling the power or the ON input.
The MAX4773 has an autoretry feature where the switch
turns off and issues a FLAGto the microprocessor after
the blanking time and then continuously checks to see if
the overload condition is present. The switch remains
on after the overload condition disappears and FLAG
deasserts.
The MAX4772/MAX4773 are available in tiny space-sav-
ing 6-pin SOT23 and 6-pin TDFN (3mm x 3mm) pack-
ages.
Applications
SDIO
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
FeaturesGuaranteed Current Limit: 200mA or 500mAThermal-Shutdown Protection Reverse-Current Protection0.2ΩOn-Resistance (SEL = High)14ms Guaranteed Blanking TimeFLAGFunctionAutoretry (MAX4773)80µA Supply Current6µA Latch-Off Current (MAX4772)0.01µA Shutdown Current2.0V to 4.5V Supply RangeFast Current-Limit Response Time Tiny SOT23 and TDFN Packages UL Certification Pending
MAX4772/MAX4773
200mA/500mA Selectable
Current-Limit Switches
Ordering Information
2.0V TO 4.5V
OUT
FLAG
GND
TO SDIO PORT
MAX4772
MAX4773
SEL
Typical Operating Circuit
19-2926; Rev 0; 7/03
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX4772EUT-T-40°C to +85°C6 SOT23-6ABND
MAX4772ETT*-40°C to +85°C6 TDFN-EP**—
MAX4773EUT-T-40°C to +85°C6 SOT23-6ABNE
MAX4773ETT*-40°C to +85°C6 TDFN-EP**—
Selector Guide
PARTAUTORETRY
MAX4772EUK-TNo
MAX4772ETTNo
MAX4773EUK-TYes
MAX4773ETTYes
GNDOUTSEL
MAX4772
MAX4773
SOT23
TOP VIEWFLAGON
OUTONGND
MAX4772
MAX4773
TDFNFLAGSEL
Pin Configurations
*Future product—contact factory for availability.
**EP—Exposed pad.
MAX4772/MAX4773
200mA/500mA Selectable
Current-Limit Switches
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= +2.0V to +4.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VIN= +3.3V, 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, ON, FLAG, SEL, OUT to GND.............................-0.3V to +6V
OUT Short Circuit to GND.................................Internally Limited
Continuous Power Dissipation (TA= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............696mW
6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951mW
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Operating VoltageVIN2.04.5V
Quiescent CurrentIQVON = VIN, switch onVIN = +3.3V80125µA
Latch-Off Current (Note 2)ILATCHVON = VIN, after an
overcurrent fault (MAX4772)VIN = +3.3V610µA
Shutdown CurrentISHDNVON = 0V, SEL = low or floating0.031µA
SEL = low, VIN = 3.3V, VOUT = GND200320Forward-Current LimitSEL = high, VIN = 3.3V, VOUT = GND500800mA
SEL = low320Reverse-Current LimitSEL = high800mA
ON Input Leakage-1+1µA
Shutdown Forward LeakageVON = 0V, VOUT = 0V0.011µA
Shutdown Reverse LeakageVON = 0V, VIN = 2V, VOUT = 4.5V1µA
SEL Pulldown CurrentAfter power-up (VIN > 2V, 0V < VSEL < 0.5V)30100µA
SEL Input CurrentMeasured after first low-to-high transition-1+1µA
SEL = low, ILOAD = 100mA0.450.9On-Resistance (Note 3)RONSEL = high, ILOAD = 100mA0.180.36Ω
VIN = 2V to 3.6V1.4ON, SEL Input Logic High
VoltageVIHVIN > 3.6V2V
ON, SEL Input Logic Low VoltageVIL0.5V
FLAG Output Logic Low VoltageISINK = 1mA0.4V
FLAG Output High Leakage
CurrentVIN = VFLAG = VON = 4.5V1µA
Thermal Shutdown150°C
Thermal-Shutdown Hysteresis15°C
DYNAMIC
Turn-On Time (Note 4)VON from low to high, IOUT = 10mA,
CL = 0.1µF120µs
Turn-Off Time (Note 4)VON from high to low, IOUT = 10mA,
CL = 0.1µF100ns
Blanking TimetBLANKOvercurrent fault (Figures 4 and 5)1460ms
MAX4772/MAX4773
200mA/500mA Selectable
Current-Limit Switches
Note 1:All parts are 100% tested at +25°C. Electrical limits across the full temperature range are guaranteed by design and corre-
lation.
Note 2:Latch-off current does not include the current flowing into FLAG.
Note 3:TDFN parts are guaranteed by design.
Note 4:The on-time is defined as the time taken for the current through the switch to go from 0mA to full load. The off-time is defined
as the time taken for the current through the switch to go from full load to 0mA.
Note 5:Retry time is typically 15 times the blanking time (typ).
ELECTRICAL CHARACTERISTICS (continued)
(VIN= +2.0V to +4.5V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at VIN= +3.3V, TA= +25°C.) (Note 1)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
Short-Circuit Current-Limit
Response TimeVON = VIN, short circuit applied to OUT5µs
Retry Time (Note 5)tRETRYMAX4773 (Figure 4)210900ms
Typical Operating Characteristics
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4772 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
VON = VIN
SUPPLY CURRENT vs. TEMPERATURE
MAX4772 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (
VON = VIN
LATCH-OFF CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
LATCH-OFF CURRENT (
A)
MAX4772 toc03
VON = VIN
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4772 toc04
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
MAX4772 toc05
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
VON = 0V, VOUT = 0V
LATCH-OFF LEAKAGE CURRENT
vs. TEMPERATURE
MAX4772 toc06
TEMPERATURE (°C)
LATCH-OFF LEAKAGE CURRENT (nA)
MAX4772/MAX4773
200mA/500mA Selectable
Current-Limit Switches
Typical Operating Characteristics (continued)
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
SHUTDOWN REVERSE LEAKAGE CURRENT
vs. TEMPERATURE
MAX4772 toc07
TEMPERATURE (°C)
SHUTDOWN LEAKAGE CURRENT (nA)
VON = 0V, VOUT = 4.5V
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX4772 toc08
TEMPERATURE (°C)
NORMALIZED R
OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX4772 toc09
VIN - VOUT (V)
OUTPUT CURRENT (mA)
VSEL = VIN
VSEL = GND
FORWARD CURRENT LIMIT
vs. SUPPLY VOLTAGE
SUPPLY VOLTAGE (V)
FORWARD CURRENT LIMIT (mA)
MAX4772 toc10
OUT = GND
SEL = HIGH
SEL = LOW
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
MAX4772 toc11
OFF
TEMPERATURE (°C)
TURN-ON/OFF TIMES (
ILOAD = 10mA
FLAG-BLANKING TIMEOUT
vs. TEMPERATURE
MAX4772 toc12
TEMPERATURE (°C)
FLAG-BLANKING TIMEOUT (ms)
VIN = 3.3V COUT = 1μF
CIN = 1μF VSEL = 3.3V
40μs/div
VIN
2V/div
VON
2V/div
IOUT
200mA/div
CURRENT-LIMIT RESPONSE
MAX4772/3 toc13
VIN = VON COUT = 1μF
CIN = 1μF VSEL = 3.3V
40μs/div
VIN = VON
1V/div
IOUT
200mA/div
CURRENT-LIMIT RESPONSE
MAX4772/3 toc14
3.3V
3.3V
4μs/div
VIN
2V/div
VOUT
2V/div
IOUT
5A/div
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
MAX4772/3 toc15
CIN = 1μF
COUT = 1μF
MAX4772/MAX4773
200mA/500mA Selectable
Current-Limit Switches
Pin Description
Typical Operating Characteristics (continued)
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
PIN
SOT23TDFNNAMEFUNCTION1INInput. Bypass with a 0.1µF ceramic capacitor to ground.5GNDGround6ONActive-High Switch-On Input. A logic high turns the switch on.FLAG
Fault Output. This open-drain output goes low when the device stays in forward or reverse current limit
for more than the blanking time period. FLAG is high impedance when a fault is not present or when
ON is low.3SELCurrent-Limit Threshold Selection. Connect to logic-low level or leave floating to select 200mA current-
limit threshold. Connect to logic-high level to select 500mA current-limit threshold.2OUTSwitch Output. Bypass with a 0.1µF ceramic capacitor to ground.0V
200μs/div
VIN
2V/div
VOUT
2V/div
IOUT
1A/div
REVERSE CURRENT LIMIT
MAX4772/3 toc16
CIN = 1μF
COUT = 1μF
VSEL = 3.3V
3.3V
20μs/div
VON
1V/div
IOUT
10mA/div
SWITCH TURN-ON TIME RESPONSE
MAX4772/3 toc17
3.3V
40ns/div
VON
1V/div
IOUT
10mA/div
SWITCH TURN-OFF TIME RESPONSE
MAX4772/3 toc18
3.3V
3.3V
3.3V
10ms/div
VIN
2V/div
VOUT
2V/div
VFLAG
2V/div
IOUT
500mA/div
FLAG-BLANKING RESPONSE
(OVERLOAD CONDITION)
MAX4772/3 toc19
VSEL = VIN = 3.3V
CIN = 1μF
COUT = 1μF
MAX4772/MAX4773
Detailed Description
The MAX4772/MAX4773 are forward/reverse current-
limited switches that operate from a 2.0V to 4.5V input
voltage range and guarantee a 200mA or 500mA mini-
mum current-limit threshold when driving SEL low or
high, respectively. The voltage drop across an internal
sense resistor is compared to two reference voltages to
indicate a forward or reverse current-limit fault. When
the load current exceeds the preset current limit for
greater than the fault-blanking time, the switch opens.
The MAX4773 has an autoretry function that turns on
the switch again after an internal retry time expires. If
the faulty load condition is still present after the blank-
ing time, the switch turns off again and the cycle is
repeated. If the faulty load condition is not present, the
switch remains on.
The MAX4772 does not have the autoretry option and
the switch remains in latch-off mode until the ON pin or
the input power is cycled from high to low and then
high again.
Current-Limit Threshold Selection
The MAX4772/MAX4773 SEL logic input sets the
desired minimum current-limit threshold to 200mA or
500mA. Connect SEL low or leave floating for 200mA
current limit and high for the 500mA current limit.
During power-up, if SEL is low or floating, the current limit
is set to 200mA. The MAX4772/MAX4773 uses an internal
pulldown resistor (100µA, max) to set the default current
limit to 200mA when SEL is floating. After the first low-to-
high transition, the pulldown resistor is internally discon-
nected and the level on SEL determines the current limit
(SEL = low, 200mA and SEL = high, 500mA).
During power-up, if SEL and VINrise together, the cur-
rent limit is immediately set to 500mA.
Figures 2 and 3illustrate the two different modes of
power-up sequence for the MAX4772/MAX4773. In
Figure 2, the switch powers up, VIN≥2V, a low-to-high
transition on SEL changes the current limit from 200mA to
500mA. In Figure 3, the switch powers up in the 500mA
current-limit mode with SEL and IN rising simultaneously.
The microprocessor’s GPIO must be able to source the
100µA drive current for the MAX4772/MAX4773 500mA
current-limit operation. After the current limit has been set
to 500mA, the 100µA driving current is no longer needed.
200mA/500mA Selectable
Current-Limit Switches
Figure 1. Functional Diagram
BLANKING TIME
CIRCUITRY
REVERSE-CURRENT DETECTOR
FORWARD-CURRENT
DETECTOR
FLAG
OUTIN
GND
LOGIC
SELMAX4772/MAX4773

Partno	Mfg	Dc	Qty	Available	Descript
MAX4772ETT+	MAXIM	N/a	351	avai	200mA/500mA Selectable Current-Limit Switches