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| ST890 1.2A CURRENT LIMITED HIGH SIDE WITH THERMAL SHUTDOWN I I I I I I I 2.7V TO 5.5V INPUT RANGE PROGRAMMABLE CURRENT LIMIT UP TO 1.2A LOW QUIESCENT CURRENT THERMAL SHUTDOWN FAULT INDICATOR OUTPUT 90m (TYP.) ON RESISTANCE SO-8 PACKAGE SO-8 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 to 5.5V, making it ideal for both 3V and 5V systems. Internal current limiting circuitry protects the input supply against overload. Thermal overload Table 1: Order Codes Type ST890CD ST890CDR ST890BD ST890BDR Temperature Range 0 to 70 C 0 to 70 C -40 to 85 C -40 to 85 C Package protection limits power dissipation and junction temperatures. The ST890's maximum current limits is 1.2A. The current limit through the switch is programed with a resistor from SET to ground. The ST890 is available in SO-8 package. Main applications are: PCMCIA slots, Access bus slots, Portable equipment. Comments 50parts per tube / 40tube per box 2500 parts per reel 50parts per tube / 40tube per box 2500 parts per reel SO-8 (Tube) SO-8 (Tape & Reel) SO-8 (Tube) SO-8 (Tape & Reel) Figure 1: Schematic Diagram July 2005 Rev. 4 1/9 ST890 Table 2: Absolute Maximum Ratings Symbol VI VON VFAULT_N VSET IDS Tstg Top Supply Voltage Input Voltage at ON pin Input Voltage at FAULT_N pin Voltage at SET pin Maximum Continuous Switching Current Storage Temperature Range Operating Junction Temperature Range (C series) (B series) Parameter Value -0.5 to 6 -0.5 to 6 -0.5 to 6 -0.5 to (VIN + 0.5) 1.5 -65 to +150 0 to +70 -40 to +85 Unit V V V V A C C C Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. Table 3: Thermal Data Symbol Rthj-amb Parameter Thermal Resistance Junction-ambient (*) SO-8 160 Unit C/W (*) This value depends from thermal design of PCB on which the device is mounted. Table 4: Truth Table For ON/OFF Switch ON/OFF L H FAULT H L OUT ON OFF FLAG Normal Operation Fault Condition Figure 2: Pin Connection (top view) Table 5: Pin Description Pin N 1, 2 3 4 5 6, 7 8 Symbol IN ON GND SET OUT FAULT Name and Function Input P-Channel MOSFET source. Bypass IN with a 1F 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 current limit in Amperes Switch Output. P-Channel MOSFET drain. Bypass OUT with a 0.1F capacitor to GROUND. Fault Indicator Output. This open drain output goes low when in current limit or when the die temperature exceeds 135C 2/9 ST890 Table 6: Electrical Characteristics (VIN=3V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 C) Symbol VI ICC Parameter Operating Voltage ID =1mA VI = 5V, ON=IN ON=IN ON=GND VI = VOUT =5.5V VI = 5.5V VO =0 2.0 2.4 100 VI = 4.5V VI = 3V VSET IMAX ISC IO/ISET VIL VIH II ISET VOL IOH TPROT THYST Reference Voltage to Turns IO =100mA VSET rise until VI - VO > 0.8V The Switch OFF Maximum Output Current Limit Short Circuit Current Limit IO to ISET Current Ratio ON Input High Level Voltage ON Input Leakage Current ISET Bias Current IO =500mA VO > 1.6V VI = 2.7 to 3.6V VI = 4.5 to 5.5V VI = 5.5V VSET = 1.24V IO =0A VI = VO VSET = 1V 130 15 0.5 0.15 1 ON Input Low Level Voltage VI = 2.7 to 5.5V 2.0 2.4 1 3 A A V A C C 1.178 75 90 1.24 1.2 1.2 ILIM 970 1110 1300 0.8 V V 120 130 1.302 V A A IO =0 Test Conditions Min. 2.7 13 Typ. Max. 5.5 25 1 5 2.6 V mV m Unit V A A ON Quiescent Supply Current I(CCOFF) OFF Quiescent Supply Current VULO VHYST RON Undervoltage Lockout Undervoltage Lockout Hysteresys ON Resistance Rising Edge FAULT Output Low Voltage ISINK =1mA VSET = 1.4V FAULT Output High Voltage VFAULT =5.5V Thermal Protection Thermal Hysteresys Table 7: Timing Characteristics (VIN=3V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 C) Symbol tRESP Parameter Slow Current Loop Response Time Fast Current Loop Response Time Turn ON Time Turn OFF Time Test Conditions 20% Current Overdrive, VCC = 5V Min. Typ. 5 2 VI = 5V, VI = 3V, tOFF VI = 5V IO =500mA IO =500mA 1 25 50 2 10 s 50 Max. Unit s s s tON 3/9 ST890 Figure 3: Typical Application Circuit TYPICAL PERFORMANCE CHARACTERISTICS (unless otherwise specified Tj = 25C Figure 4: ON Resistance vs Supply Voltage Figure 6: ON Resistance vs Temperature Figure 5: ON Resistance vs Supply Voltage Figure 7: Output Voltage vs Input Voltage 4/9 ST890 Figure 8: Switching Waveforms, Figure 9: Switching Waveforms, VCC=5V, R L=0.6 VCC=5V, R L=0.32 5/9 ST890 SO-8 MECHANICAL DATA DIM. A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 mm. MIN. 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 0.228 0.010 0.016 TYP MAX. 1.75 0.25 1.65 0.51 0.25 5.00 4.00 MIN. 0.053 0.04 0.043 0.013 0.007 0.189 0.150 0.050 0.244 0.020 0.050 inch TYP. MAX. 0.069 0.010 0.065 0.020 0.010 0.197 0.157 8 (max.) 0.04 0016023/C 6/9 ST890 Tape & Reel SO-8 MECHANICAL DATA mm. DIM. MIN. A C D N T Ao Bo Ko Po P 8.1 5.5 2.1 3.9 7.9 12.8 20.2 60 22.4 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 TYP MAX. 330 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 MIN. TYP. MAX. 12.992 0.519 inch 7/9 ST890 Table 8: Revision History Date 22-Jul-2005 Revision 4 Add 3 rows on Table 2. Description of Changes 8/9 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 All other names are the property of their respective owners (c) 2005 STMicroelectronics - All Rights Reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com 9/9 |
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