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
ST890
TYPICAL AP PLICATION CIRCUIT
TYPICAL PERFORMANCE CHARACT ERISTICS (unless otherwise specified T
Figure1 : ON Resistance vs Supply Voltage
Figure2 : ON Resistance vs Supply Voltage
Figure3 : ON Resistance vs Temperature
Figure4 : Output Voltage vs Input Voltage
=25°C
j
4/7
Figure5 : Switching Waveforms, Figure 6 : Switching Waveforms,
V
R
V
R
=5V,
CC
=0.6Ω
L
CC
=5V,
=0.32Ω
L
ST890
5/7
ST890
SO-8 MECHANICAL DATA
DIM.
A 1.75 0.068
a1 0.1 0.25 0.003 0.009
a2 1.65 0.064
a3 0.65 0.85 0.025 0.033
b 0.35 0.48 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.25 0.5 0.010 0.019
c1 45˚ (typ.)
D 4.8 5.0 0. 189 0. 196
E 5.8 6.2 0.228 0.244
e 1.27 0.050
e3 3.81 0.150
F 3.8 4. 0 0.149 0. 157
L 0.4 1. 27 0.015 0.050
M 0.6 0. 023
S
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
˚ (max.)
8
6/7
0016023
ST890
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibilit y for the
consequences of use of such informatio n nor for any infringement of paten ts or o ther rig hts of t hird part ies which ma y result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previousl y suppl ied. STM icroel ectronics produc ts are not auth orized for use as c ritica l compone nts in l ife s upport dev ices or
systems without express written approval of STMicroelectronics.
Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco
© The ST logo is a registered trademark of STMicroelectronics
© 2002 STMicroelectronics - Printed in Italy - All Rights Reserved
STMicroelectronics GROUP OF COMPANIES
Singapore - Spain - Sweden - Switzerland - United Kingdom - United States.
© http://www.st.com
7/7
Loading...