MAX4785EXK+T-MAX4786EXS+T-MAX4787EXK-MAX4787EXK+-MAX4787EXK+T-MAX4788EXS+T Fast Delivery |IC PHOENIX CO.,LIMITED

MAX4787EXK+T ,50mA/100mA Current-Limit SwitchesApplicationsMAX4788EXS-T -40°C to +85°C 4 SC70-4 AGHPDAs and Palmtop DevicesCell PhonesSelector Gui ..
MAX4787EXK-T ,50mA/100mA Current-Limit Switchesapplications.When the switch is on and a load is connected to the FLAG Function (MAX4785/MAX4787) ..
MAX4788EXS+T ,50mA/100mA Current-Limit Switchesapplications.When the switch is on and a load is connected to the ♦ FLAG Function (MAX4785/MAX4787) ..
MAX4789EUK+T ,200mA/250mA/300mA Current-Limit SwitchesApplications +Denotes a lead-free/RoHS-compliant package.T = Tape and reel.PDAs and Palmtop Devices ..
MAX4789EUK-T ,200mA/250mA/300mA Current-Limit SwitchesApplications*EP = Exposed pad.PDAs and Palmtop DevicesOrdering Information continued at end of data ..
MAX478CPA ,17レA Max, Dual/Quad, Single-Supply, Precision Op AmpsELECTRICAL CHARACTERISTICS: 5V(V = 5V, 0V, V = 0.1V, V = 1.4V, T = +25°C, unless otherwise noted.) ..
MAX8877EUK50+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8877EUK50-T ,Low-noise, low-dropout, 150mA linear regulator with '2982 pinout. Preset output voltage 5.00V.
MAX8877EZK18+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8877EZK25+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8877EZK29 ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8877EZK29+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout

MAX4785EXK+T-MAX4786EXS+T-MAX4787EXK-MAX4787EXK+-MAX4787EXK+T-MAX4788EXS+T
50mA/100mA Current-Limit Switches
General Description
The MAX4785–MAX4788 family of switches feature inter-
nal 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. They are avail-
able with guaranteed 50mA and 100mA current limits,
making them ideal for load-switching applications.
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 MAX4785 and MAX4787 enter a latch-off state
where the switch is turned off and FLAGis issued to the
microprocessor. The switch can be turned on again by
cycling the power or the ON pin.
The MAX4786 and MAX4788 have an autoretry feature
where the switch turns off after the blanking time and
then continuously checks to see if the overload condi-
tion is present. The switch remains on after the overload
condition disappears.
The MAX4785 and MAX4787 are available in a tiny
space-saving 4-pin or 5-pin SC70 package. The
MAX4786 and MAX4788 are available only in the 4-pin
SC70 package. For higher current current-limiting
switches, refer to the MAX4789–MAX4794 and
MAX1693 data sheets.
Applications
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
FeaturesGuaranteed Current Limit: 50mA, 100mAThermal-Shutdown Protection Reverse-Current Protection0.7ΩOn-Resistance14ms Guaranteed Blanking TimeFLAGFunction (MAX4785/MAX4787)65µA Supply Current8µA Latch-Off Current (MAX4785/MAX4787)0.01µA Shutdown Current2.3V to 5.5V Supply RangeUndervoltage LockoutFast Current-Limit Response Time Tiny SC70 Package
MAX4785–MAX4788
50mA/100mA Current-Limit Switches
Ordering Information
2.3V TO 5.5V
OUT
FLAG
GND
TO EXTERNAL PORT
MAX4785
MAX4787
Typical Operating Circuit
19-2664; Rev 1; 4/03
Selector Guide appears at end of data sheet.
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX4785EXS-T-40°C to +85°C4 SC70-4AGE
MAX4785EXK-T-40°C to +85°C5 SC70-5ADL
MAX4786EXS-T-40°C to +85°C4 SC70-4AGF
MAX4787EXS-T-40°C to +85°C4 SC70-4AGG
MAX4787EXK-T-40°C to +85°C5 SC70-5AND
MAX4788EXS-T-40°C to +85°C4 SC70-4AGH
GNDINOUT
MAX4785
MAX4787
SC70
TOP VIEWFLAGONINOUT
MAX4785–
MAX4788
SC70GND
Pin Configurations
MAX4785–MAX4788
50mA/100mA Current-Limit Switches
ABSOLUTE MAXIMUM RATINGS
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)
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, OUT to GND.....................................-0.3V to +6V
OUT Short Circuit to GND.................................Internally Limited
Continuous Power Dissipation (TA= +70°C)
4-Pin SC70 (derate 3.1mW/°C above +70°C)..............245mW
5-Pin SC70 (derate 3.1mW/°C above +70°C)..............247mW
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 VoltageVIN2.35.5V
VIN = 2.3V to 5.0V65100Quiescent CurrentIQVON = VIN, IOUT = 0,
switch onVIN = 5.0V to 5.5V120µA
Latch-Off Current (Note 2)ILATCHVON = VIN, after an overcurrent fault
(MAX4785/MAX4787)815µA
Shutdown CurrentISHDNVON = 0V0.011µA
MAX4785/MAX478650120Forward Current LimitIFWDMAX4787/MAX4788100240mA
MAX4785/MAX4786120Reverse Current LimitIREVMAX4787/MAX4788240mA
ON Input LeakageVON = VIN or GND-1+1µA
Off Switch LeakageVON = 0V, VOUT = 0V0.011µA
Undervoltage LockoutUVLORising edge1.82.2V
Undervoltage Lockout Hysteresis100mV
TA = +25°C, IOUT = 20mA0.71On-ResistanceRONTA = -40°C to +85°C, IOUT = 20mA1.3Ω
ON Input Logic High VoltageVIH2.0V
ON Input Logic Low VoltageVIL0.8V
FLAG Output Logic Low VoltageISINK = 1mA (MAX4785/MAX4787)0.4V
FLAG Output High Leakage
CurrentVIN = V F LAG = 5.5V (MAX4785/MAX4787)1µA
Thermal Shutdown150°C
Thermal-Shutdown Hysteresis15°C
DYNAMIC
Turn-On Time (Note 3)ON from low to high; IOUT = 10mA,
CL = 0.1µF50µs
Turn-Off Time (Note 3)ON from high to low; IOUT = 10mA,
CL = 0.1µF30ns
MAX4785–MAX4788
50mA/100mA Current-Limit Switches
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4785-01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
VON = VIN
SUPPLY CURRENT
vs. TEMPERATURE
MAX4785-02
TEMPERATURE (°C)
SUPPLY CURRENT (3510-15
VON = VIN VIN = 5V
VIN = 3.3V
LATCH-OFF CURRENT
vs. TEMPERATURE
MAX4785 toc03
TEMPERATURE (°C)
LATCH-OFF (3510-15
VON = VIN
VIN = 5V
VIN = 3.3V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4785-04
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)3510-15
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
MAX4785-05
TEMPERATURE (°C)
SHUTDOWN LEAKAGE CURRENT (nA)3510-15
VIN = 5V
VIN = 3.3V
LATCH-OFF LEAKAGE CURRENT
vs. TEMPERATURE
MAX4785 toc06
TEMPERATURE (°C)
LATCH-OFF LEAKAGE CURRENT (nA)3510-15
VIN = 5V
VIN = 3.3V
Typical Operating Characteristics
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
Note 1:All parts are 100% tested at +25°C. Limits across the full temperature range are guaranteed by design and correlation.
Note 2:Latch-off current does not include the current flowing into FLAG.
Note 3: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 4:Retry time is typically 7x the blanking time.
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
Blanking TimetBLANKOvercurrent fault, Figures 2, 31460ms
Short-Circuit Current-Limit
Response Time
VON = VIN = 3.3V, short circuit applied to
OUT5µs
Retry Time (Note 4)tRETRYMAX4786/MAX4788: overcurrent fault,
Figure 298420ms
MAX4785–MAX4788
50mA/100mA Current-Limit Switches
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX4785-07
TEMPERATURE (°C)
NORMALIZED R3510-15
VCC = 3.3V
OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX4785 toc08
VIN - VOUT (V)
OUTPUT CURRENT (mA)
MAX4787/MAX4788
MAX4785/MAX4786
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
MAX4785 toc09
TEMPERATURE (°C)
TURN-ON/OFF TIMES (3510-15
VCC = 3.3V
ILOAD = 10mA
OFF
VCC = 5V
FLAG-BLANKING TIMEOUT
vs. TEMPERATURE
MAX4785 toc10
TEMPERATURE (°C)
FLAG-BLANKING TIME (ms)3510-15
CURRENT-LIMIT RESPONSE
MAX4785 toc11
40μs/div
VON
2V/div
IOUT
100mA/div
VIN
2V/div
COUT = 1μF VIN = 3.3V
CIN = 1μF
CURRENT-LIMIT RESPONSE
MAX4785 toc12
20μs/div
IOUT
100mA/div
VIN = VON
1V/div
COUT = 1μF
VIN = VON
CIN = 1μF
Typical Operating Characteristics (continued)
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
MAX4785–MAX4788
50mA/100mA Current-Limit Switches
Pin Description
SWITCH TURN-ON TIME RESPONSE
MAX4785 toc14
100μs/div
IOUT
10mA/div
VON
VIN = 3.3V
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
MAX4785 toc13
40μs/div
VOUT
2V/div
IOUT
2A/div
VIN
2V/div
CIN = 1μF
COUT = 1μF
Typical Operating Characteristics (continued)
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
PIN
SC70SC70NAMEFUNCTIONOUTSwitch Output. Bypass with a 0.1µF capacitor to ground.GNDGroundFLAG
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.ONActive-High Switch-On Input. A logic high turns the switch on.INInput. Bypass with a 0.1µF ceramic capacitor to ground.
FLAG-BLANKING RESPONSE
MAX4785 toc16
4ms/div
FLAG
2V/div
IOUT
100mA/div
VIN
2V/div
VON
2V/div
SWITCH TURN-OFF TIME RESPONSE
MAX4785 toc15
100ns/div
VON
2V/div
IOUT
10mA/div
VIN = 3.3V
MAX4785–MAX4788
Detailed Description
The MAX4785–MAX4788 are forward/reverse current-
limited switches that operate from a 2.3V to 5.5V input
voltage range and guarantee a 50mA and 100mA mini-
mum current-limit threshold for different options. The
voltage drop across an internal sense resistor is com-
pared 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 MAX4786 and MAX4788 have 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 blanking time, the switch turns off again and the
cycle is repeated. If the faulty load condition is not pre-
sent, the switch remains on.
The MAX4785 and MAX4787 do 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.
The undervoltage lockout (UVLO) circuit prevents erro-
neous switch operation when the input voltage goes too
low during startup conditions.
Reverse-Current Protection
The MAX4785–MAX4788 limit the reverse current (VOUT
to VIN) from exceeding the maximum IREVvalue. The
switch is shut off and FLAGis asserted (MAX4785/
MAX4787) if the reverse current-limit condition persists
for more than the blanking time. This feature prevents
excessive reverse currents 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 preset or the die
exceeds the thermal-shutdown temperature of +150°C,
OUT is internally disconnected from IN and the supply
current decreases to 8µA (latch off). 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 MAX4785–MAX4788 current-
limit switches.
50mA/100mA Current-Limit Switches
BLANKING TIME
CIRCUITRY
REVERSE-CURRENT
DETECTOR
FORWARD CURRENT
DETECTOR
+2.0V
FLAG
OUTIN
GND
MAX4785/MAX4787
ONLY
LOGIC
AUTO-
RETRYMAX4785–MAX4788
UNDERVOLTAGE
LOCKOUT
Figure 1. MAX4785–MAX4788 Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX4785EXK+T \|MAX4785EXKT	MAXIM	N/a	2500	avai	50mA/100mA Current-Limit Switches
MAX4785EXK+T	MAXI	N/a	4000	avai	50mA/100mA Current-Limit Switches
MAX4786EXS+T	DALLAS	N/a	2927	avai	50mA/100mA Current-Limit Switches
MAX4787EXK	MAX	N/a	2500	avai	50mA/100mA Current-Limit Switches
MAX4787EXK+	MAXIM ?	N/a	1950	avai	50mA/100mA Current-Limit Switches
MAX4787EXK+T	MAXIM	N/a	10000	avai	50mA/100mA Current-Limit Switches
MAX4788EXS+T	MAXIM	N/a	3940	avai	50mA/100mA Current-Limit Switches