MAX4798EUK-MAX4798EUK+T Fast Delivery |IC PHOENIX CO.,LIMITED

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 _______
MAX479CSD+ ,17µA Max, Dual Quad, Single-Supply, Precision Op AmpsGeneral Description _______
MAX479EPD ,17レA Max, Dual/Quad, Single-Supply, Precision Op AmpsMAX478/MAX47919-0127; Rev. 1; 11/9817µA Max, Dual/Quad, Single-Supply,Precision Op Amps____________ ..
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
MAX8878EUK29 ,Low-Noise, Low-Dropout, 150mA Linear Regulators with '2982 Pinout

MAX4798EUK-MAX4798EUK+T
450mA/500mA Current-Limit Switches
General Description
The MAX4795–MAX4798 family of switches feature inter-
nal 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 a 2.0V
to 4.5V input voltage range. They are available with guar-
anteed 450mA and 500mA current 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 the
transient voltages settle down. If after this blanking time,
the load current is greater than the current limit, the
MAX4795 and MAX4797 switches are turned off and
FLAGis issued to the microprocessor. The switch can be
turned on again by cycling the power or the ON input.
The MAX4796 and MAX4798 have an autoretry feature
where the switch turns off and issues a FLAGto the
microprocessor after the blanking time and then contin-
uously checks to see if the overload condition is pre-
sent. The switch remains on after the overload condition
disappears and FLAGdeasserts.
The MAX4795–MAX4798 are available in tiny, space-
saving, 5-pin SOT23 and 6-pin TDFN (3mm x 3mm)
packages.
Applications
SDIO
PDAs and Palmtop Devices
Cell Phones
GPS Systems
Hand-Held Devices
FeaturesGuaranteed Current Limit: 450mA and 500mAThermal-Shutdown Protection Reverse-Current Protection0.2ΩOn-Resistance14ms Guaranteed Blanking TimeFLAGFunctionAutoretry (MAX4796/MAX4798)80µA Supply Current6µA Latchoff Current
(MAX4795/MAX4797)0.01µA Shutdown Current+2V to +4.5V Supply RangeFast Current-Limit Response TimeTiny SOT23 and TDFN PackagesUL Certification Pending
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
Ordering Information
+2.0V TO +4.5V
OUT
FLAG
GND
TO SDIO PORT
MAX4795
MAX4796
MAX4797
MAX4798
Typical Operating Circuit
19-2944; Rev 0; 8/03
PARTTEMP RANGEPIN-
PACKAGE
TOP
MARK
MAX4795EUK-T-40°C to +85°C5 SOT23-5AEDI
MAX4795ETT*40°C to +85°C6 TDFN-EP**—
MAX4796EUK-T-40°C to +85°C5 SOT23-5AEDJ
MAX4796ETT*-40°C to +85°C6 TDFN-EP**—
MAX4797EUK-T-40°C to +85°C5 SOT23-5AEDK
MAX4797ETT*-40°C to +85°C6 TDFN-EP**—
MAX4798EUK-T-40°C to +85°C5 SOT23-5AEDL
MAX4798ETT*-40°C to +85°C6 TDFN-EP**—
GND
FLAGOUTIN
MAX4795
MAX4796
MAX4797
MAX4798
SOT23
TOP VIEWON
OUT
FLAGONGND
MAX4795
MAX4796
MAX4797
MAX4798
TDFNN.C.
Pin Configurations
*Future product—contact factory for availability.
**EP = Exposed pad.
Selector Guide appears at end of data sheet.
MAX4795–MAX4798
450mA/500mA 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.
Note 1:All parts are 100% tested at +25°C. Electrical 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:TDFN packages 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.
IN, ON, FLAG, OUT to GND.....................................-0.3V to +6V
OUT Short Circuit to GND.................................Internally Limited
Continuous Power Dissipation (TA= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
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, IOUT = 0, switch onVIN = +3.3V80125µA
Latch-Off CurrentILATCHVON = VIN, after an overcurrent
fault (MAX4795/MAX4797) (Note 2)VIN = +3.3V610µA
Shutdown CurrentISHDNVON = 0V0.031µA
MAX4795/MAX4796, VIN = 3.3V, VOUT = GND450720Forward Current LimitMAX4797/MAX4798, VIN = 3.3V, VOUT = GND500800mA
MAX4795/MAX4796720Reverse Current LimitMAX4797/MAX4798800mA
ON Input Leakage-1+1µA
Shutdown Forward LeakageVON = 0V, VOUT = 0V0.011µA
Shutdown Reverse LeakageVON = 0V, VIN = 2V, VOUT = 4.5V1µA
MAX4795/MAX4796, ILOAD = 100mA0.20.4On-Resistance (Note 3)RONMAX4797/MAX4798, IL OA D = 100m A0.180.36Ω
VIN = +2V to +3.6V1.4ON Input Logic High VoltageVIHVIN > 3.6V2V
ON Input Logic Low VoltageVIL0.5V
FLAG Output Logic Low VoltageIS IN K = 1m A0.4V
FLAG Output High Leakage
CurrentVIN = V F LAG = VON = 4.5V1µA
Thermal Shutdown150°C
Thermal-Shutdown Hysteresis15°C
DYNAMIC
Turn-On TimeV ON fr om l ow to hi g h; IOU T = 10m A, C L = 0.1µF ( N ote 4) 120µs
Turn-Off TimeV ON fr om hi g h to l ow ; IOU T = 10m A, C L = 0.1µF ( N ote 4) 100ns
Blanking TimetBLANKOvercurrent fault; Figures 2, 31460ms
Short-Circuit Current-Limit
Response TimeVON = VIN, short circuit applied to OUT5µs
Retry TimetRETRYMAX4796/MAX4798, Figure 2 (Note 5)210900ms
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
QUIESCENT SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX4795 toc01
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (
VON = VIN
SUPPLY CURRENT vs. TEMPERATURE
MAX4795 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (
VON = VIN
LATCH-OFF CURRENT
vs. TEMPERATURE
TEMPERATURE (°C)
LATCH-OFF CURRENT (
A)
MAX4795 toc03
VON = VIN
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX4795 toc04
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
SHUTDOWN LEAKAGE CURRENT
vs. TEMPERATURE
MAX4795 toc05
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (nA)
VON = 0V, VOUT = 0V
LATCH-OFF LEAKAGE CURRENT
vs. TEMPERATURE
MAX4795 toc06
TEMPERATURE (°C)
LATCH-OFF LEAKAGE CURRENT (nA)
SHUTDOWN REVERSE LEAKAGE CURRENT
vs. TEMPERATURE
MAX4795 toc07
TEMPERATURE (°C)
SHUTDOWN LEAKAGE CURRENT (nA)
VON = 0V, VOUT = 4.5V
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX4795 toc08
TEMPERATURE (°C)
NORMALIZED R
OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX4795 toc09
VIN - VOUT (V)
OUTPUT CURRENT (mA)
MAX4797/MAX4798
MAX4795/MAX4796
Typical Operating Characteristics
(VIN = 3.3V, TA = +25°C, unless otherwise noted.)
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
FORWARD CURRENT LIMIT
vs. SUPPLY VOLTAGE
MAX4795 toc10
SUPPLY VOLTAGE (V)
FORWARD CURRENT LIMIT (mA)
OUT = GND
MAX4797/MAX4798
MAX4795/MAX4796
SWITCH TURN-ON/OFF TIMES
vs. TEMPERATURE
MAX4795 toc11
TEMPERATURE (°C)
TURN-ON/OFF TIMES (
OFF
ILOAD = 10mA
FLAG-BLANKING TIMEOUT
vs. TEMPERATURE
MAX4795 toc12
TEMPERATURE (°C)
FLAG-BLANKING TIMEOUT (ms)
3.3V
3.3V
VIN = 3.3V COUT = 1μF
CIN = 1μF VSEL = 3.3V
40μs/div
VIN
2V/div
VON
2V/div
IOUT
200mA/div
MAX4797/MAX4798
CURRENT-LIMIT RESPONSE
MAX4795 toc13
VIN = VON COUT = 1μF
CIN = 1μF
40μs/div
VIN = VON
1V/div
IOUT
200mA/div
MAX4797/MAX4798
CURRENT-LIMIT RESPONSE
MAX4795 toc14
3.3V
3.3V
4μs/div
VIN
2V/div
VOUT
2V/div
IOUT
5A/div
CURRENT-LIMIT RESPONSE
(OUT SHORTED TO GND)
MAX4795 toc15
CIN = 1μF
COUT = 1μF0V
200μs/div
VIN
2V/div
VOUT
2V/div
IOUT
1A/div
MAX4797/MAX4798
REVERSE CURRENT LIMIT
MAX4795 toc16
CIN = 1μF
COUT = 1μF
20μs/div
VON
1V/div
IOUT
10mA/div
SWITCH TURN-ON TIME RESPONSE
MAX4795 toc17
VIN = 3.3V
Typical Operating Characteristics (continued)
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
Pin Description
PIN
SOT23TDFNNAMEFUNCTIONINInput. Bypass with a 0.1µF ceramic
capacitor to ground.5GNDGroundONActi ve-H i g h S w itch On Inp ut. A log i c
hi gh tur ns the sw i tch on.FLAG
Faul t Outp ut. Thi s op en- d r ai n outp utoes l ow w hen the devi ce stays i n
forw ar d or r ever se cur rent l i m it for ore than the bl anki ng ti m e p eri od .
FLAG i s hi gh i mp ed ance w hen a faul ts not p r esent or when ON is l ow .2OUTS w itch Output. Byp ass wi th a 0.1µF
ceram i c capaci tor to g round.3N.C.No Connection. Not internally
connected.
REVERSE-CURRENT
DETECTOR
FORWARD-CURRENT
DETECTOR
OUT
FLAG
GNDLOGIC
AUTORETRYMAX4795–MAX4798
BLANKING TIME
CIRCUITRY
Figure 1. Functional Diagram
3.3V
40ns/div
VON
1V/div
IOUT
10mA/div
SWITCH TURN-OFF TIME RESPONSE
MAX4795 toc18
Typical Operating Characteristics (continued)
(VIN= 3.3V, TA= +25°C, unless otherwise noted.)
3.3V
3.3V
3.3V
10ms/div
VIN
2V/div
VOUT
2V/div
VFLAG
2V/div
IOUT
500mA/div
MAX4797/MAX4798
FLAG-BLANKING RESPONSE
(OVERLOAD CONDITION)
MAX4795 toc19
VIN = 3.3V
CIN = 1μF
COUT = 1μF
MAX4795–MAX4798
450mA/500mA Current-Limit Switches
Detailed Description
The MAX4795–MAX4798 are forward/reverse current-
limited switches that operate from a 2V to 4.5V input
voltage range and guarantee a 450mA and 500mA
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 MAX4796 and MAX4798 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 MAX4795 and MAX4797 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.
Reverse-Current Protection
The MAX4795–MAX4798limit the reverse current (VOUT
to VIN) from exceeding the maximum IREVvalue. The
switch is shut off and FLAGis asserted 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 if 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 MAX4795–MAX4798 current-limit
switches.
FLAGIndicator
The MAX4795–MAX4798 feature a latched output (FLAG).
Whenever an overcurrent condition is encountered,
the MAX4795/MAX4797 latch FLAGlow and turn the
switch off. The MAX4796/MAX4798 latch FLAGlow and
keep it low until the overcurrent condition is removed.
During this time, the switch cycles on and off in the
autoretry mode. When the overcurrent condition is
removed, FLAGdeasserts and the switch turns on
(Figure 2). FLAGis an open-drain output transistor and
requires an external pullup resistor from FLAGto IN.
During shutdown (ON is low), the pulldown on FLAG
output is released to limit power dissipation. FLAGgoes
low when any of the following conditions occur:The die temperature exceeds the thermal-shutdown
temperature limit of +150°C.The device is in current limit for more than the fault-
blanking period.The switch is in autoretry.
SWITCH
STATUS
tBLANK
OFF
tRETRY
CURRENT
LIMIT
SHORT
CONDITION
REMOVED
FLAG PIN
STATUS
tBLANKtBLANK
Figure 2. MAX4796/MAX4798 Autoretry Fault-Blanking DiagramFAULTSWITCH ON/OFFSUPPLY CURRENT MODE
LowXOFFShutdown
HighThermalOFF immediately (tBLANK period does not apply)Latchoff
OFF after tBLANK period has elapsedLatchoff
HighCurrent limitON during tBLANK period, OFF during tRETRY period for the
MAX4796 and MAX4798; cycle repeats until fault is removedSee the Autoretry section
Table 1. MAX4795–MAX4798 Switch Truth Table

Partno	Mfg	Dc	Qty	Available	Descript
MAX4798EUK+T \|MAX4798EUKT	MAX	N/a	10	avai	450mA/500mA Current-Limit Switches
MAX4798EUK	MAXIM	N/a	160	avai	450mA/500mA Current-Limit Switches
MAX4798EUK+T \|MAX4798EUKT	MAXI	N/a	35000	avai	450mA/500mA Current-Limit Switches