SGS Thomson Microelectronics ST890CDR, ST890CD, ST890BD Datasheet

1.2A CURRENT LIMITED HIGH SIDE WITH

■ 2.7V TO5.5V INPUT RANGE

■ PROGRAMMABLE CURRENT LIMITUP TO

1.2A

■ LOW QUIESCENT CURRENT

■ THERMAL SHUTDOWN

■ FAULT INDICATOR OUTPUT

■ 90mΩ (TYP.) ON RESISTANCE

■ SO-8 PACKAGE

ST890

THERMAL SHUTDOWN

SO-8

DESCRIPTION

The ST890 is a low voltage, P-Channel MOSFET
power switch intended for high side load switching
applications.

This s w itch operates with inputs from 2 .7V ti 5.5V,
making it ideal for both 3V and 5V syst ems.
Internal current limiting circuitry protects the input
supply against overload. Thermal overload

protection limits power dissipation and junction
temperatures.
The ST890’s maxmimum current limits is 1.2A.
The current limit through the switch is programed
with a resistor from SET to groung. The S T890 is
available in SO-8 package. Main applications are:
PCMCIA slots, Access bus slots, Portable
equipment.

ORDERING CODES

Type

ST890CD 0 to 70 °C SO-8 (Tube) 50partsper tube / 40tube per box

ST890CDR 0 to 70 °C SO-8 (Tape & Reel) 2500 parts per reel

ST890BD -40 to 85 °C SO-8 (Tube) 50partsper tube / 40tube per box

ST890BDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel

Temperature

Range

Package Comments

SCHEMATIC DIAGRAM

1/7September 2002

ST890

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter² Value Unit

V

V

ON,

V

FAULT

V

SET,VO

I

DS

T

T

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.

THERMAL DATA

Symbol Parameter SO-8 Unit

R

thj-amb

(*) This value depends from thermal design of PCB on which the device is mounted.

TRUTH TABLE FOR ON/OFF S WICH CONNECTION DIAGRAM (top view)

I

Supply Voltage

-0.5 to 6 V

Power DMOS Drain to Source Voltage -0.5 to 6 V

Logic Input Voltage -0.5 to (VIN+ 0.5)
Maximum Continuous Switching Current
Storage Temperature Range

stg

Operating Junction Temperature Range (C series)

op

Thermal Resistance Junction-ambient (*)

(B series)

1.5 A

-65 to +150 °C
0to+70

-40 to +85

160 °C/W

V

°C
°C

ON/OFF OUT

LON
H OFF

FAULT FLAG

H Normal Operation
L Fault Condition

PIN DESCRIPTION

Pin N° Symbol Name and Function

1, 2 IN Input P-Channel MOSFET source. Bypass IN with a 1µF capacitor to ground.

3ON
4 GND Ground
5 SET Set Current Limit Input. A resistor from SET to GROUND sets the current limit for

6, 7 OUT Switch Output. P-Channel MOSFET drain. Bypass OUT with a 0.1mF capacitor to

8FAULT

Active Low Switch On Input. A logic low turns the switch ON

the switch. R

=1.38x103/I

SET

, where I

LIM

is the desired currnet limit in Amperes

LIM

GROUND.
Fault Indicator Output. This open drain output goes low when in current limit or

when the die temperature exceeds 135°C

2/7

ST890

ELECTRICAL CHARACTERISTICS (VIN=3V, TA=T

values are at T

=25°C)

A

MIN

to T

, unless ot herwise specified. Typical

MAX

Symbol Parameter Test Conditions Min. Typ. Max. Unit

VIOperating Voltage ID=1mA 2.7 5.5 V

I

CC

I

(CCOFF)

V

ULO

V

HYST

R

ON

V

SET

I

MAX

I

SC

I

O/ISETIO

V

IL

V

IH

I

I

I

SETISET

V

OL

I

OH

T

PROT

T

HYST

ON Quiescent Supply
Current

OFF Quiescent Supply
Current

Undervoltage Lockout Rising Edge 2.0 2.4 2.6 V
Undervoltage Lockout

Hysteresys
ON Resistance VI= 4.5V 75 120 mΩ

Reference Voltage to Turns
The Switch OFF

Maximum Output Current
Limit

Short Circuit Current Limit 1.2 I

to I

Current Ratio IO=500mA VO> 1.6V 970 1110 1300

SET

ON Input Low Level Voltage VI= 2.7 to 5.5V 0.8 V
ON Input High Level

Voltage
ON Input Leakage Current VI= 5.5V 1 µA

Bias Current V
FAULT Output Low Voltage I
FAULT Output High Voltage V
Thermal Protection 130 °C
Thermal Hysteresys 15 °C

VI=5V, ON=GND IO=0 13 25 µA

ON=IN VI=V

=IN VI= 5.5V VO=0 5

ON

=5.5V 1 µA

OUT

100 mV

=3V 90 130

V

I

IO=100mA V

rised until VI-VO> 0.8V 1.178 1.24 1.302 V

SET

1.2 A

LIM

VI= 2.7 to 3.6V 2.0 V

= 4.5 to 5.5V 2.4

V

I

= 1.24V IO=0A VI=V

SET

SINK

FAULT

=1mA V

=5.5V V

= 1.4V 0.15 V

SET

SET

O

=1V 1 µA

0.5 3 µA

A

TIMINGL CHARACTERISTICS (V
are at T

=25°C)

A

=3V, TA=T

IN

MIN

to T

, unless ot herwise spec if ied. Typical values

MAX

Symbol Parameter Test Conditions Min. Typ. Max. Unit

t

RESP

Slow Current Loop
Response Time

Fast Current Loop

20% Current Overdrive, VCC=5V 5 µs

2 µs

Response Time

t

Turn ON Time VI=5V, IO=500mA 25 50 µs

ON

=3V, IO=500mA 50

V

I

Turn OFF Time VI=5V 1 2 10 µs

t

OFF

3/7