Datasheet

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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 Range

♦ Programmable Current Limits

♦ Low Supply Current:

16µA I

at V

= 3.3V

0.1µA with Switch Off

♦ Thermal Shutdown

MAX894L/MAX895L

Dual, Current-Limited, High-Side P-Channel

Switches with Thermal Shutdown

________________________________________________________________ Maxim Integrated Products 1

SET B

SET A

GND

OUT B

OUT A

MAX894L

MAX895L

TOP VIEW

ONA

ONB

Pin Configuration

MAX894L

MAX895L

INPUT

GND

SET B

OUTPUT B

OUTPUT A

0.1µF

0.1µF1µF

ON/OFF

ONB

OUT B

SET A

SET

OUT A

ONA

Typical 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 T

= +25°C.

CURRENT

LIMIT

500mA

MAX895LESA -40°C to +85°C 8 SO 250mA

MAX895LC/D

0°C to +70°C Dice** 250mA

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Summary of content (8 pages)

PAGE 1
9-1153; Rev 1; 2/07 Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown 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 currentlimiting circuitry protects the input supply against overload. Thermal-overload protection limits power dissipation and junction temperature.
PAGE 2
MAX894L/MAX895L Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown ABSOLUTE MAXIMUM RATINGS IN to GND ...................................................................-0.3V to 6V ONA, ONB to 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 ................................
PAGE 3
Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown MAX894L/MAX895L ELECTRICAL CHARACTERISTICS (VIN = 3V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2) PARAMETER CONDITION Operating Voltage MIN 3.0 TYP MAX UNITS 5.5 V Quiescent Current VIN = 5V, ONA = ONB = GND, IOUT A = IOUT B = 0 50 µA Off-Supply Current ONA = ONB = IN, VIN = VOUT A = VOUT B = 5.5V 2.2 µA Off-Switch Current ONA = ONB = IN, VIN = 5.
PAGE 4
__________________________________________Typical Operating Characteristics (Typical Operating Circuit, TA = +25°C, unless otherwise noted.) QUIESCENT CURRENT vs. TEMPERATURE 12 8 VIN = 5V 16 VIN = 3V 10 1 0.1 12 0 2 1 3 5 4 0.01 -40 6 -20 0 20 40 60 80 INPUT VOLTAGE (V) TEMPERATURE (°C) OFF-SWITCH CURRENT vs. TEMPERATURE NORMALIZED ON-RESISTANCE vs. TEMPERATURE 1.3 MAX894L-04 NORMALIZED RON 10 1 IOUT = 1/2 ILIMIT -20 0 20 40 60 80 0.
PAGE 5
Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown (Typical Operating Circuit, TA = +25°C, unless otherwise noted.) CURRENT-LIMIT RESPONSE (MAX894L, RL = 0.7Ω) CURRENT-LIMIT RESPONSE (MAX894L, RL = 1Ω) A 5V 5V A B B C 0A 0A 0V C 0V MAX894/895/896 TOC-10 MAX894/895/896 TOC-9 1µs/div 2µs/div CIN = 47µF, COUT = 0.1µF A: VIN, 500mV/div, AC coupled B: IOUT, 2A/div C: VOUT, 5V/div CIN = 47µF, COUT = 0.
PAGE 6
MAX894L/MAX895L Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown ______________________________________________________________Pin Description PIN NAME FUNCTION 1 OUT A Switch A Output. P-channel MOSFET drain. Bypass OUT A with a 0.1µF capacitor to ground. 2 OUT B Switch B Output. P-channel MOSFET drain. Bypass OUT B with a 0.1µF capacitor to ground. 3 SET A Set Current-Limit Input. A resistor from SET A to ground sets the current limit for switch A.
PAGE 7
Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown The MAX894L/MAX895L P-channel MOSFET power switches limit output current to a user-programmed level. When the output current is increased beyond the set current level, the current also increases through the replica switch (IOUT/1050) (MAX895) and through RSET (Figure 1). The current-limit error amplifier compares the voltage across RSET to the internal 1.
PAGE 8
MAX894L/MAX895L Dual, Current-Limited, High-Side P-Channel Switches with Thermal Shutdown Tape-and-Reel Information 4.0 ±0.1 1.0 ±0.1 2.0 ±0.05 1.5 +0.1/-0.0 DIAMETER 1.75 ±0.1 A 3.5 ±0.05 8.0 ±0.3 2.2 ±0.1 0.5 RADIUS TYPICAL 4.0 ±0.1 A0 A Bo Ko 0.30 ±0.05 0.8 ±0.05 1.0 MINIMUM Ao = 3.1mm ±0.1 Bo = 2.7mm ±0.1 Ko = 1.2mm ±0.1 NOTE: DIMENSIONS ARE IN MM. AND FOLLOW EIA481-1 STANDARD. 0.30R MAX. ___________________Chip Information TRANSISTOR COUNT: 453 SUBSTRATE CONNECTED TO GND.