MAX894LESA-T Fast Delivery |IC PHOENIX CO.,LIMITED

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MAX894LESA-T
Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown
General Description
The MAX894L/MAX895L smart, dual, low-voltage,
P-channel, MOSFET power switches are intended for
high-side load-switching applications. These switches
operate with inputs from +2.7V to +5.5V, making them
ideal for both 3V and 5V systems. Internal current-
limiting circuitry protects the input supply against
overload. Thermal-overload protection limits power dis-
sipation and junction temperature.
The MAX894L/MAX895L’s maximum current limits are
500mA and 250mA, respectively. The current limit
through the switches is programmed with resistors from
SET A/SET B to ground. When the switches are on, the
quiescent supply current is a low 16µA. When the
switches are off, the supply current decreases to 0.1µA.
The MAX894L/MAX895L are available in an 8-pin SO
package.
________________________Applications
PCMCIA Slots
Access Bus Slots
Portable Equipment
____________________________Features+2.7V to +5.5V Input RangeProgrammable Current LimitsLow Supply Current:
16µA IQat VIN= 3.3V
0.1µA with Switch OffThermal Shutdown
MAX894L/MAX895L
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
SET BSET A
GNDINOUT B
OUT A
MAX894L
MAX895L
TOP VIEWONA
ONB
Pin Configuration
MAX894L
MAX895LINPUT
GND
SET B
OUTPUT B
OUTPUT A
0.1μF
0.1μF1μF
ON/OFF
ON/OFFONB
OUT B
SET A
RSET ARSET B
OUT A
ONAypical Operating Circuit
19-1153; Rev 1; 2/07
PART*
MAX894LC/D
MAX894LESA-40°C to +85°C
0°C to +70°C
TEMP.
RANGE
PIN-
PACKAGE
Dice**
8 SO
Ordering Information
*To order these units in tape and reel, add (-T) to the end of the
part number.
**Dice are tested at TA= +25°C.
CURRENT
LIMIT
500mA
500mA
MAX895LESA-40°C to +85°C8 SO250mA
MAX895LC/D0°C to +70°CDice**250mA
MAX894L/MAX895L
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VIN= 3V, TA= 0°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.)
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 to GND...................................................................-0.3V to 6V
ONA, ONBto GND.....................................................-0.3V to 6V
SET A, SET B, OUT A, OUT B to GND........-0.3V to (VIN+ 0.3V)
Maximum Continuous Switch Current
MAX894L..........................................................................0.75A
MAX895L........................................................................0.375A
Continuous Power Dissipation (TA= +70°C)
SO (derate 5.88mW/°C above +70°C).......................471mW
Operating Temperature Range
MAX89_LESA.................................................-40°C to +85°C
Storage Temperature Range...............................-65°C to+150°C
Lead Temperature (soldering, 10sec)..............................+300°C
VSET A= 1.4V, ONA= 0, ONB= VIN, IOUT A= 0,
VIN= VOUT
VONA= VONB= 5.5V
ONA= ONB= IN, VIN= VOUT A= VOUT B= 5.5V
VIN= 4.5V to 5.5V
VIN= 2.7V to 3.6V
VIN= 5V, ONA= ONB= GND, IOUT A= IOUT B= 0
VIN= 2.7V to 5.5V
VIN= 3.0V
MAX895L
ONA= ONB= IN, VIN= 5.5V, VOUT A= VOUT B= 0
Rising edge, 1% hysteresis
MAX894L
VSETrequired to turn the switch off (Note 1)
CONDITION
ISETA,ISETB Bias Current0.011ONA,ONBInput Leakage2.4ONA,ONBInput High Voltage2.00.8ONA,ONBInput Low Voltage250
500Maximum Output Current1.1781.2401.302Current-Limit-Amplifier Threshold0.00011Off-Supply Current18302.75.5Operating Voltage
Quiescent Current
2504200.00210Off-Switch Current2.02.42.6Undervoltage Lockout
On-Resistance
UNITSMINTYPMAXPARAMETER
VIN= 4.5V
MAX894L
MAX895L
MAX895L
20% current overdrive, VCC= 5Vµs5Slow-Current-Loop Response Time2Fast-Current-Loop Response Time
Note 1:Tested with IOUT= 50mA for the MAX894L and 25mA for the MAX895L, and VSETraised until VIN- VOUT≥0.8V.
MAX895L, IOUT= 125mA
MAX894L, IOUT= 250mAA/AVOUT> 1.6V91010501235
94510851270IOUTto ISET Current Ratio
MAX894L
VIN= 5V, IOUT= 250mA (MAX894L), 125mA (MAX895L)100200µsTurn-On TimeVIN= 3V, IOUT= 250mA (MAX894L), 125mA (MAX895L)150
Turn-Off Time0.81.220µs
VSET B= 1.4V, ONB= 0, ONA= VIN, IOUT B= 0,
VIN= VOUT0.53
MAX894L/MAX895L
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
ELECTRICAL CHARACTERISTICS
(VIN= 3V, TA= -40°C to +85°C,unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
ONA= ONB= IN, VIN= VOUT A= VOUT B= 5.5V
VIN= 5V, ONA= ONB= GND, IOUTA= IOUT B= 0
VIN= 5V
MAX894L, IOUT= 250mA
VIN= 3.0V
MAX895L
ONA= ONB= IN, VIN= 5.5V, VOUT A= VOUT B= 0
Rising edge, 1% hysteresis
MAX894L
VSET_required to turn the switch off (Note 1)
CONDITION
VIN= 4.5V
MAX894L
MAX895L200Turn-On Time
A/AVOUT> 1.6V9101360IOUTto ISET Current Ratio1.141.34Current-Limit-Amplifier Threshold2.2Off-Supply Current503.05.5Operating Voltage
Quiescent Current
42010Off-Switch Current2.02.9Undervoltage Lockout
On-Resistance
UNITSMINTYPMAXPARAMETER0.2520Turn-Off Time
Note 2:Specifications to -40°C are guaranteed by design, not production tested.
MAX895L, IOUT= 125mA8801315
MAX894L/MAX895L
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
__________________________________________Typical Operating Characteristics
(Typical Operating Circuit, TA= +25°C, unless otherwise noted.)
QUIESCENT CURRENT
vs. INPUT VOLTAGE
MAX894 TOC-01
INPUT VOLTAGE (V)
QUIESCENT CURRENT (6
ONA = ONB = GND
IOUT A = IOUT B = 0
QUIESCENT CURRENT
vs. TEMPERATURE
MAX894 TOC-02
TEMPERATURE (°C)
QUIESCENT CURRENT (
VIN = 5V
VIN = 3V
OFF-SUPPLY CURRENT
vs. TEMPERATURE
MAX894L-03
TEMPERATURE (°C)
OFF-SUPPLY CURRENT (nA)
OFF-SWITCH CURRENT
vs. TEMPERATURE
MAX894L-04
TEMPERATURE (°C)
OFF-SWITCH CURRENT (nA)
NORMALIZED OUTPUT CURRENT
vs. OUTPUT VOLTAGE
MAX894 TOC-06A
OUTPUT VOLTAGE (V)
NORMALIZED OUTPUT CURRENT
VIN = 5V
ILIMIT
NORMALIZED ON-RESISTANCE
vs. TEMPERATURE
MAX894 TOC-05
TEMPERATURE (°C)
NORMALIZED R
IOUT = 1/2 ILIMIT140
IOUT/ISET vs. ILIMIT
MAX894 TOC-06
ILIMIT (%)
OUT
SET
RATIO
TURN-ON TIME
vs. TEMPERATURE
MAX894 TOC-07
TEMPERATURE (°C)
tON
ILOAD = ILIMIT
VIN = 5V
VIN = 3V
TURN-OFF TIME
vs. TEMPERATURE
MAX894 TOC-08
TEMPERATURE (°C)
tOFF (
VIN = 3V
VIN = 5V
ILOAD = ILIMIT
MAX894L/MAX895L
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
2μs/div
CIN = 47μF, COUT = 0.1μF
A: VIN, 500mV/div, AC coupled
CURRENT-LIMIT RESPONSE
(MAX894L, RL = 1Ω)
A5V
B: IOUT, 2A/div
C: VOUT, 5V/div
MAX894/895/896 TOC-91μs/div
CIN = 47μF, COUT = 0.1μF
A: VIN, 500mV/div, AC coupled
CURRENT-LIMIT RESPONSE
(MAX894L, RL = 0.7Ω)
B: IOUT, 2A/div
C: VOUT, 5V/div
MAX894/895/896 TOC-10
VIN = 5V, IOUT = ILIMIT
A: VON, 2V/div
B: VOUT, 2V/div
SWITCH TURN-ON TIME
20µs/div
MAX894/895/896 TOC-11
SWITCH TURN-OFF TIME
2µs/div
VIN = 5V, IOUT = ILIMIT
A: VON, 2V/div
B: VOUT, 2V/div
MAX894/895/896 TOC-12
____________________________Typical Operating Characteristics (continued)
(Typical Operating Circuit, TA= +25°C, unless otherwise noted.)
2ms/div
VIN = 5V
A: IOUT = 0 to 500mA, 0.2A/div
B: VOUT RIPPLE, 200mV/div, AC COUPLED
LOAD-TRANSIENT RESPONSE
(MAX894L)B
MAX494/495/496 TOC-13
MAX894L/MAX895L
Dual, Current-Limited, High-Side P-Channel
Switches with Thermal Shutdown
NAMEFUNCTIONOUT ASwitch A Output. P-channel MOSFET drain. Bypass OUT A with a 0.1μF capacitor to ground.OUT BSwitch B Output. P-channel MOSFET drain. Bypass OUT B with a 0.1μF capacitor to ground.
PINSET ASet Current-Limit Input. A resistor from SET A to ground sets the current limit for switch A. See Setting the
Current Limitsection.ONAActive-Low Switch A On Input. A logic low turns switch A on.ONBActive-Low Switch B On Input. A logic low turns switch B on.INInput, Switches A and B. P-channel MOSFET source. Bypass IN with a 1μF capacitor to ground.SET BSet Current-Limit Input. A resistor from SET B to ground sets the current limit for switch B. See Setting the
Current Limitsection.GNDGround
______________________________________________________________Pin Description
1.24V
CURRENT-LIMIT
AMPLIFIER B
REPLICA
AMPLIFIER A
CONTROL
CIRCUITRY
REPLICA
AMPLIFIER B
1.24V
CURRENT-LIMIT
AMPLIFIER A
OUT B
OUT A
SET B
RSET B
SET A
RSET A
GND
ONB
ONA
MAX894L
MAX895L
Figure 1. Functional Diagram

Partno	Mfg	Dc	Qty	Available	Descript
MAX894LESA-T \|MAX894LESAT	MAX	N/a	17083	avai	Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown