ST890 STMICROELECTRONICS | Alldatasheet

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Technical content

■ 2.7V TO 5.5V INPUT RANGE ■ PROGRAMMABLE CURRENT LIMIT UP TO 1.2A ■ LOW QUIESCENT CURRENT ■ THERMAL SHUTDOWN ■ FAULT INDICATOR OUTPUT ■ 90m Ω (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 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 0 to 70 °C SO-8 (Tube) 50parts per 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) 50parts per tube / 40tube per box ST890BDR -40 to 85 °C SO-8 (Tape & Reel) 2500 parts per reel ST890 1.2A CURRENT LIMITED HIGH SIDE WITH THERMAL SHUTDOWN SCHEMATIC DIAGRAM SO-8

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA (*) This value depends from thermal design of PCB on which the device is mounted. TRUTH TABLE FOR ON/OFF SWICH CONNECTION DIAGRAM (top view) PIN DESCRIPTION Symbol Parameter² Value Unit VI Supply Voltage -0.5 to 6 V VON, VFAULT Power DMOS Drain to Source Voltage -0.5 to 6 V VSET, VO Logic Input Voltage -0.5 to (V IN + 0.5) V IDS Maximum Continuous Switching Current 1.5 A Tstg Storage Temperature Range -65 to +150 °C Top Operating Junction Temperature Range (C series) (B series) 0t o+ 7 0 -40 to +85 Symbol Parameter SO-8 Unit Rthj-amb Thermal Resistance Junction-ambient (*) 160 °C/W ON /OFF OUT LO N H OFF FAULT FLAG H Normal Operation L Fault Condition Pin N° Symbol Name and Function 1, 2 IN Input P-Channel MOSFET source. Bypass IN with a 1 µF capacitor to ground. 3O N Active Low Switch On Input. A logic low turns the switch ON

4 GND Ground

5 SET Set Current Limit Input. A resistor from SET to GROUND sets the current limit for the switch. R SET =1.38x103/ILIM, where ILIM is the desired currnet limit in Amperes 6, 7 OUT Switch Output. P-Channel MOSFET drain. Bypass OUT with a 0.1mF capacitor to GROUND. 8F A U L T Fault Indicator Output. This open drain output goes low when in current limit or when the die temperature exceeds 135°C

ELECTRICAL CHARACTERISTICS (VIN=3V, TA =T MIN to TMAX , unless otherwise specified. Typical values are at TA =2 5° C ) TIMINGL CHARACTERISTICS (VIN=3V, TA =T MIN to TMAX , unless otherwise specified. Typical values are at TA =2 5° C ) Symbol Parameter Test Conditions Min. Typ. Max. Unit VI Operating Voltage I D =1mA 2.7 5.5 V ICC ON Quiescent Supply Current VI=5 V , O N =GND I O =0 13 25 µA I(CCOFF) OFF Quiescent Supply Current ON =IN V I=V OUT =5.5V 1 µA ON =IN V I= 5.5V V O =0 5 VULO Undervoltage Lockout Rising Edge 2.0 2.4 2.6 V VHYST Undervoltage Lockout Hysteresys 100 mV R ON ON Resistance V I= 4.5V 75 120 m Ω VI=3 V 9 0 1 3 0 VSET Reference Voltage to Turns The Switch OFF IO =100mA V SET rised until VI-V O > 0.8V 1.178 1.24 1.302 V IMAX Maximum Output Current Limit 1.2 A ISC Short Circuit Current Limit 1.2 I LIM A IO /ISET IO to ISET Current Ratio I O =500mA V O > 1.6V 970 1110 1300 VIL ON Input Low Level Voltage VI= 2.7 to 5.5V 0.8 V VIH ON Input High Level Voltage VI= 2.7 to 3.6V 2.0 V VI= 4.5 to 5.5V 2.4 II ON Input Leakage Current VI= 5.5V 1 µA ISET ISET Bias Current V SET = 1.24V IO =0A V I=V O 0.5 3 µA V OL FAULT Output Low Voltage ISINK =1mA V SET = 1.4V 0.15 V IOH FAULT Output High Voltage VFAULT =5.5V V SET =1 V 1 µA TPROT Thermal Protection 130 °C THYST Thermal Hysteresys 15 °C Symbol Parameter Test Conditions Min. Typ. Max. Unit tRESP Slow Current Loop Response Time 20% Current Overdrive, VCC =5 V 5 µs Fast Current Loop Response Time 2 µs tON Turn ON Time V I=5 V , I O =500mA 25 50 µs VI=3 V , I O =500mA 50 tOFF Turn OFF Time V I=5 V 1 2 1 0 µs

Figure 5 :Switching Waveforms, Figure 6 :Switching Waveforms, VCC =5V,R L=0.6Ω VCC =5V,R L=0.32Ω

DIM. mm. inch 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 ˚ (max.) SO-8 MECHANICAL DATA 0016023

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