MAX4794EUS+T ,200mA/250mA/300mA Current-Limit SwitchesMAX4789–MAX479419-2663; Rev 3; 10/08200mA/250mA/300mA Current-Limit Switches
MAX4798EUK ,450mA/500mA Current-Limit SwitchesApplicationsMAX4796EUK-T -40°C to +85°C 5 SOT23-5 AEDJSDIOMAX4796ETT* -40°C to +85°C 6 TDFN-EP** —P ..
MAX4798EUK+T ,450mA/500mA Current-Limit Switchesapplications.♦ Autoretry (MAX4796/MAX4798)When the switch is on and a load is connected to the♦ 80µ ..
MAX4798EUK+T ,450mA/500mA Current-Limit SwitchesFeaturesThe MAX4795–MAX4798 family of switches feature inter- ♦ Guaranteed Current Limit: 450mA and ..
MAX479CPD ,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.) ..
MAX479CSD ,17レA Max, Dual/Quad, Single-Supply, Precision Op AmpsGeneral Description _______
MAX8877EZK36+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8877EZK50+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8878EUK18+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8878EUK25+T ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8878EUK28 ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX8878EUK28 ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout
MAX4789EUK+T-MAX4790EUS+T-MAX4792EUS+T-MAX4793EUK+-MAX4793EUS+T-MAX4794ETT+T-MAX4794ETT+TG075-MAX4794ETT+TG40-MAX4794EUS+T
200mA/250mA/300mA Current-Limit Switches
General DescriptionThe MAX4789–MAX4794 family of switches feature
internal current limiting to prevent damage to host
devices due to faulty load conditions. These analog
switches have a low 0.2Ωon-resistance and operate
from 2.3V to 5.5V input voltage range. They are avail-
able with guaranteed 200mA, 250mA, and 300mA cur-
rent limits, making them ideal for SDIO and other 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 MAX4789, MAX4791, and MAX4793 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 MAX4790, MAX4792, and MAX4794 have an
autoretry feature where the switch turns off 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.
The MAX4789–MAX4794 are available in 6-pin 3mm x
3mm TDFN and tiny space-saving 4-pin SOT143 pack-
ages. The MAX4789/MAX4790/MAX4791/MAX4793 are
also available in a tiny 5-pin SOT23 package. For lower
current current-limiting switches, refer to the MAX4785–
MAX4788 data sheet.
ApplicationsPDAs and Palmtop Devices
Cell Phones
GPS Systems
Handheld Devices
SDIO
FeaturesGuaranteed Current Limit: 200mA, 250mA, 300mAThermal-Shutdown Protection Reverse Current Protection0.2ΩOn-Resistance14ms Guaranteed Blanking TimeFLAG
Function (MAX4789/MAX4791/MAX4793)80µA Supply Current8µA Latch-Off Current
(MAX4789/MAX4791/MAX4793)0.01µA Shutdown Current2.3V to 5.5V Supply RangeUndervoltage LockoutFast Current-Limit Response Time (5µs)TDFN and SOT23/SOT143 Packages
MAX4789–MAX4794
200mA/250mA/300mA Current-Limit Switches
Ordering Information2.3V TO 5.5V
OUT
FLAG
GND
TO SDIO PORT
MAX4789
MAX4791
MAX4793
Typical Operating Circuit19-2663; Rev 3; 10/08
*EP = Exposed paddle.
+Denotes a lead-free/RoHS-compliant package.
T = Tape and reel.
Ordering Information continued at end of data sheet.
Selector Guide appears at end of data sheet.
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX4789EUS+T-40°C to +85°C4 SOT143KAFE
MAX4789EUK+T-40°C to +85°C5 SOT23AEAC
MAX4789ETT+-40°C to +85°C6 TD FN - E P *ABO
MAX4790EUS+T-40°C to +85°C4 SOT143KAFF
MAX4790ETT+-40°C to +85°C6 TDFN-EPABP
GND
FLAG
Pin Configurations continued at end of data sheet.OUTIN
MAX4789
MAX4791
MAX4793
SOT23TOP VIEWONONINOUT
MAX4789–
MAX4794
SOT143GND
Pin Configurations
MAX4789–MAX4794
200mA/250mA/300mA 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 SOT143 (derate 4.0mW/°C above +70°C)..........320mW
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Pin TDFN (derate 24.4mW/°C above +70°C).........1951.2mW
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOperating VoltageVIN2.35.5V
VIN = +2.3V to +5.0V80120Quiescent CurrentIQVON = VIN, IOUT = 0,
switch onVIN = +5.0V to +5.5V160µA
Latch-Off Current (Note 2)ILATCHVON = VIN, after an overcurrent fault
(MAX4789/MAX4791/MAX4793)815µA
Shutdown CurrentISHDNVON = 0V0.011µA
MAX4789/MAX4790200300
MAX4791/MAX4792250375Forward Current Limit
MAX4793/MAX4794300450
MAX4789/MAX4790300
MAX4791/MAX4792375Reverse Current Limit
MAX4793/MAX4794450
Shutdown Reverse LeakageVON = 0, VIN = 3V, VOUT = 5V100µA
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 = 100mA0.20.4On-ResistanceRONTA = - 40° C to + 85°C , IOU T = 100m A0.5Ω
ON Input Logic High VoltageVIH2.0V
ON Input Logic Low VoltageVIL0.8V
FLAG Output Logic Low VoltageIS IN K = 1m A ( M AX 4789/M AX 4791/M AX 4793) 0.4V
FLAG Output High Leakage
Current
VIN = V FLAG = 5.5V
(MAX4789/MAX4791/MAX4793)1µA
Thermal Shutdown150°C
Thermal-Shutdown Hysteresis15°C
DYNAMICTurn-On Time (Note 3)VON from low to high; IOUT = 10mA,
CL = 0.1µF100µs
Turn-Off Time (Note 3)VON from high to low; IOUT = 10mA,
CL = 0.1µF40ns
MAX4789–MAX4794
200mA/250mA/300mA Current-Limit Switches
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGEMAX4789 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
VON = VIN
SUPPLY CURRENT
vs. TEMPERATUREMAX4789 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (3510-15
VON = VIN
VIN = 5V
VIN = 3.3V
LATCH-OFF CURRENT
vs. TEMPERATUREMAX4789 toc03
TEMPERATURE (°C)
LATCH-OFF (3510-15
VON = VIN
VIN = 5V
VIN = 3.3V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4789 toc04
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)3510-15
VIN = 5V
VIN = 3.3V
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
MAX4789 toc05
TEMPERATURE (°C)
SHUTDOWN LEAKAGE CURRENT (nA)3510-15
VIN = 5V
VIN = 3.3V
LATCH-OFF LEAKAGE CURRENT
vs. TEMPERATUREMAX4789 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 7 times 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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSBlanking TimetBLANKOvercurrent fault (Figures 2, 3)1460ms
Short-Circuit Current-Limit
Response Time
VON = VIN = 3.3V, short circuit applied to
OUT5µs
Retry Time (Note 4)tRETRYMAX4790/MAX4792/MAX4794 (Figure 2)98420ms
MAX4789–MAX4794
200mA/250mA/300mA Current-Limit Switches
NORMALIZED ON-RESISTANCE
vs. TEMPERATUREMAX4789 toc07
TEMPERATURE (°C)
NORMALIZED R3510-15
VIN = 5V
OUTPUT CURRENT
vs. OUTPUT VOLTAGEMAX4789 toc08
VIN - VOUT (V)
OUTPUT CURRENT (mA)
MAX4793/MAX4794
MAX4789/MAX4790
MAX4791/MAX4792
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATUREMAX4789 toc09
TEMPERATURE (°C)
TURN-ON/OFF TIMES (3510-15
ILOAD = 10mA
OFF
VIN = 3.3VVIN = 5V
FLAG-BLANKING TIMEOUT
vs. TEMPERATUREMAX4789 toc10
TEMPERATURE (°C)
FLAG-BLANKING TIME (ms)3510-15
CURRENT-LIMIT RESPONSE
MAX4789 toc11
40μs/div
VIN
2V/div
VON
2V/div
IOUT
100mA/div
VIN = 3.3V
CIN = 1μF
COUT = 1μF
CURRENT-LIMIT RESPONSEMAX4789 toc12
20μs/div
VIN = VON
1V/div
IOUT
100mA/divVIN = VON
CIN = 1μF
COUT = 1μF
Typical Operating Characteristics (continued)(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
MAX4789–MAX4794
200mA/250mA/300mA Current-Limit Switches
Pin Description
SWITCH TURN-ON TIME RESPONSEMAX4789 toc14
100μs/div
VON
1V/div
IOUT
10mA/div
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)MAX4789 toc13
40μs/div
VIN
2V/div
VOUT
2V/div
IOUT
5A/div
CIN = 1μF
COUT = 1μF
Typical Operating Characteristics (continued)(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
PIN
TDFN-EPMAX4789
MAX4791
MAX4793
TDFN-EPMAX4790
MAX4792
MAX4794
5-SOT23MAX4789
MAX4791
MAX4793
4-SOT143MAX4789–
MAX4794
NAMEFUNCTION4—FLAG
Faul t O utp ut. Thi s op en- d r ai n outp ut g oes l ow w hen the d evi ce stays i n
for w ar d or r ever se cur r ent l i m i t for m or e than the b l anki ng ti m e p er i od .
FLAG i s hi g h i m p ed ance w hen a faul t i s not p r esent or w hen O N i s l ow .22GNDGround333ONActive-High Switch On Input. A logic high turns the switch on.1, 4——N.C.No Connection. Not internally connected.514INInput. Bypass IN with a 0.1µF ceramic capacitor to ground.651OUTSwitch Output. Bypass OUT with a 0.1µF ceramic capacitor to ground.EP
Exposed paddle. Connect EP to a large ground plane to maximize
thermal performance. EP is not intended as an electrical connection
FLAG-BLANKING RESPONSEMAX4789 toc16
4ms/div
FLAG
2V/div
IOUT
100mA/div
VIN
2V/div
VON
2V/div
SWITCH TURN-OFF TIME RESPONSEMAX4789 toc15
200ns/div
VON
2V/div
IOUT
10mA/div
MAX4789–MAX4794
Detailed DescriptionThe MAX4789–MAX4794 are forward/reverse current-
limited switches that operate from a 2.3V to 5.5V input
voltage range and guarantee a 200mA, 250mA, and
300mA minimum current-limit threshold for different
options. The voltage drop across an internal sense
resistor is compared to two reference voltages to indi-
cate 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 MAX4790, MAX4792, and MAX4794 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 condi-
tion is not present, the switch remains on.
The MAX4789, MAX4791, and MAX4793 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 ProtectionThe MAX4789–MAX4794 limit the reverse current (VOUT
to VIN) from exceeding the maximum IREVvalue. The
switch is shut off and FLAGis asserted (MAX4789/
MAX4791/MAX4793) if the reverse current-limit condition
persists for more than the blanking time. This feature pre-
vents excessive reverse currents from flowing through the
device.
Switch-On/Off ControlToggle 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 (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 MAX4789–MAX4794 current-limit
switches.
FLAGIndicatorThe MAX4789, MAX4791, and MAX4793 feature a
latched fault output, FLAG. Whenever a fault is activat-
ed, it latches FLAGoutput low and also turns the switch
200mA/250mA/300mA Current-Limit SwitchesBLANKING TIME
CIRCUITRY
REVERSE CURRENT
DETECTOR
FORWARD CURRENT
DETECTOR
+2.0V
FLAG
OUTIN
GND
MAX4789/MAX4791/
MAX4793 ONLY
LOGIC
AUTO-
RETRYMAX4789–MAX4794
UNDERVOLTAGE
LOCKOUT
Figure 1. Functional Diagram
