ST890 1.2A CURRENT LIMITED HIGH SIDE WITH THERMAL SHUTDOWN ■ ■ ■ ■ ■ ■ ■ 2.7V TO 5.5V INPUT RANGE PROGRAMMABLE CURRENT LIMIT UP TO 1.2A LOW QUIESCENT CURRENT THERMAL SHUTDOWN FAULT INDICATOR OUTPUT 90mΩ (TYP.) ON RESISTANCE SO-8 PACKAGE DESCRIPTION The ST890 is a low voltage, P-Channel MOSFET power switch intended for high side load switching applications. This switch operates with inputs from 2.7V ti 5.5V, making it ideal for both 3V and 5V systems. Internal current limiting circuitry protects the input supply against overload. Thermal overload SO-8 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 ST890 is available in SO-8 package. Main applications are: PCMCIA slots, Access bus slots, Portable equipment. ORDERING CODES Type Temperature Range Package Comments ST890CD ST890CDR ST890BD ST890BDR 0 to 70 °C 0 to 70 °C -40 to 85 °C -40 to 85 °C SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tube) SO-8 (Tape & Reel) 50parts per tube / 40tube per box 2500 parts per reel 50parts per tube / 40tube per box 2500 parts per reel SCHEMATIC DIAGRAM September 2002 1/7 ST890 ABSOLUTE MAXIMUM RATINGS Symbol Parameter² VI VON, VFAULT VSET, VO Value Unit Supply Voltage -0.5 to 6 V Power DMOS Drain to Source Voltage -0.5 to 6 V -0.5 to (VIN + 0.5) V 1.5 A Logic Input Voltage IDS Maximum Continuous Switching Current Tstg Storage Temperature Range -65 to +150 °C Top Operating Junction Temperature Range (C series) (B series) 0 to +70 -40 to +85 °C °C 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 Rthj-amb Thermal Resistance Junction-ambient (*) SO-8 Unit 160 °C/W (*) This value depends from thermal design of PCB on which the device is mounted. TRUTH TABLE FOR ON/OFF SWICH ON/OFF OUT L H ON OFF FAULT FLAG H L Normal Operation Fault Condition CONNECTION DIAGRAM (top view) PIN DESCRIPTION 2/7 Pin N° Symbol Name and Function 1, 2 3 4 5 IN ON GND SET Input P-Channel MOSFET source. Bypass IN with a 1µF capacitor to ground. Active Low Switch On Input. A logic low turns the switch ON Ground Set Current Limit Input. A resistor from SET to GROUND sets the current limit for the switch. RSET=1.38x103/ILIM, where ILIM is the desired currnet limit in Amperes 6, 7 OUT 8 FAULT Switch Output. P-Channel MOSFET drain. Bypass OUT with a 0.1mF capacitor to GROUND. Fault Indicator Output. This open drain output goes low when in current limit or when the die temperature exceeds 135°C ST890 ELECTRICAL CHARACTERISTICS (VIN=3V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C) Symbol VI Parameter Operating Voltage ON Quiescent Supply Current I(CCOFF) OFF Quiescent Supply Current ICC VULO Undervoltage Lockout VHYST Undervoltage Lockout Hysteresys ON Resistance RON Test Conditions ID =1mA Min. 2.7 VI = 5V, ON=GND IO =0 ON=IN VI = VOUT =5.5V ON=IN VI = 5.5V 13 VO =0 Rising Edge IMAX ISC IO/ISET VI = 4.5V VO > 1.6V VIL ON Input Low Level Voltage VI = 2.7 to 5.5V VIH ON Input High Level Voltage 1.178 V 25 µA 1 µA 2.6 120 90 130 1.24 1.302 1110 VI = 4.5 to 5.5V 2.4 VI = 5.5V ISET ISET Bias Current VSET = 1.24V IO =0A VOL FAULT Output Low Voltage ISINK =1mA IOH FAULT Output High Voltage VFAULT =5.5V VI = VO A V V 0.5 VSET = 1.4V V 1300 0.8 2.0 mΩ A 1.2 ILIM 970 V mV 1.2 VI = 2.7 to 3.6V ON Input Leakage Current II 2.4 75 IO =500mA Unit 5.5 100 Reference Voltage to Turns IO =100mA VSET rised until VI - VO > 0.8V The Switch OFF Maximum Output Current Limit Short Circuit Current Limit IO to ISET Current Ratio Max. 5 2.0 VI = 3V VSET Typ. 1 µA 3 µA 0.15 VSET = 1V V 1 µA TPROT Thermal Protection 130 °C THYST Thermal Hysteresys 15 °C TIMINGL CHARACTERISTICS (VIN=3V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C) Symbol tRESP tON tOFF Parameter Slow Current Loop Response Time Fast Current Loop Response Time Turn ON Time Turn OFF Time Test Conditions Min. 20% Current Overdrive, VCC = 5V Typ. µs 2 µs VI = 5V, IO =500mA 25 IO =500mA 50 1 Unit 5 VI = 3V, VI = 5V Max. 2 50 µs 10 µs 3/7 ST890 TYPICAL APPLICATION CIRCUIT TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25°C Figure 1 : ON Resistance vs Supply Voltage Figure 3 : ON Resistance vs Temperature Figure 2 : ON Resistance vs Supply Voltage Figure 4 : Output Voltage vs Input Voltage 4/7 ST890 Figure 5 : Switching Waveforms, Figure 6 : Switching Waveforms, VCC=5V, R L=0.6Ω VCC=5V, R L=0.32Ω 5/7 ST890 SO-8 MECHANICAL DATA DIM. mm. MIN. TYP A a1 inch MAX. MIN. TYP. 1.75 0.1 0.068 0.25 a2 MAX. 0.003 0.009 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 S 0.6 0.023 8˚ (max.) 0016023 6/7 ST890 Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may 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 previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. © The ST logo is a registered trademark of STMicroelectronics © 2002 STMicroelectronics - Printed in Italy - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Brazil - Canada - China - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. © http://www.st.com 7/7