ST890B ST890C, ST890D 1.2 A current limited high side power switch with thermal shutdown Features ■ 2.7 V to 5.5 V input range ■ Programmable current limit up to 1.2 A ■ Low quiescent current ■ Thermal shutdown ■ Active low FAULT indicator output ■ 90 mΩ (typ.) ON resistance ■ SO-8 and DFN8L (3 x 3 mm) packages SO-8 DFN8L (3 x 3 mm) Description Applications ■ PCMCIA slots ■ Access bus slots ■ Portable equipment The ST890B, ST890C and ST890D are low voltage, P-channel MOSFET power switches intended for high side load switching applications. These switches operate with inputs from 2.7 V to 5.5 V, making it ideal for both 3 V and 5 V systems. The internal current limiting circuitry protects the input supply against overload. The thermal overload protection limits power dissipation and junction temperatures. The maximum current limit is 1.2 A. The current limit through the switch is programmed with a resistor from SET to ground. The devices are available in SO-8 and DFN8L (3 x 3 mm) packages. Table 1. Device summary Order code Package Packaging ST890BDR SO-8 2500 parts per reel ST890CDR SO-8 2500 parts per reel ST890DTR DFN8L (3 x 3 mm) 3000 parts per reel December 2007 Rev 6 1/17 www.st.com 17 Contents ST890B, ST890C, ST890D Contents 1 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 3 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 4 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 2/17 ST890B, ST890C, ST890D 1 Device summary Device summary Figure 1. SO-8 pin connection (top view) IN 1 8 FAULT IN 2 7 OUT ON 3 6 OUT GND 4 5 SET CS07570 Table 2. SO-8 pin description Pin N. Symbol Name and function 1, 2 IN Input P-channel MOSFET source. Bypass IN with a 1 μF capacitor to ground 3 ON 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 GND sets the current limit for the switch. RSET = 1.38 x 103 / ILIM, where ILIM is the desired current limit in Amperes 6,7 OUT Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 μF capacitor to ground 8 FAULT Fault indicator output. This open drain output goes low when in current limit or when the die temperature exceeds 135°C 3/17 Device summary ST890B, ST890C, ST890D Figure 2. DFN8L (3 x 3 mm) pin connection (top view) IN 1 8 FAULT IN 2 7 OUT ON 3 6 OUT GND 4 5 SET CS00025 Table 3. 4/17 DFN8L (3 x 3 mm) pin description Pin N. Symbol Name and function 1, 2 IN Input P-channel MOSFET source. Bypass IN with a 1 μF capacitor to ground 3 ON 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 GND sets the current limit for the switch. 6,7 OUT Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 μF capacitor to ground 8 FAULT Fault indicator output. This open drain output goes low when in current limit or when the die temperature exceeds 135 °C ST890B, ST890C, ST890D Figure 3. Device summary Schematic diagram OUT IN - + ON /FAULT Replica amplifier + SET ON - 1.24V Current limit amplifier Control circuitry /ON GND CS00026 Table 4. Table 5. Truth table for ON/OFF switch ON/OFF OUT L ON H OFF Truth table for FAULT FAULT FLAG H Normal operation L Fault condition 5/17 Maximum rating 2 ST890B, ST890C, ST890D Maximum rating Stressing the device above the rating listed in the “Absolute maximum ratings” table may cause permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those indicated in the operating sections of this specification is not implied. Exposure to Absolute maximum rating conditions for extended periods may affect device reliability. Refer also to the STMicroelectronics SURE Program and other relevant quality documents. Table 6. Absolute maximum ratings Symbol VI VON VFAULT_N VSET Parameter Value Unit Supply voltage -0.5 to +6 V Input voltage at ON pin -0.5 to +6 V Input voltage at FAULT_N pin -0.5 to +6 V -0.5 to (VIN +0.5) V 1.5 A Voltage at SET pin IDS Maximum continuous switching current Tstg Storage temperature -65 to +150 °C Top Operating junction temperature range -40 to +85 °C Table 7. Thermal data Symbol Parameter SO-8 DFN8L Unit Rthj-amb Thermal resistance junction-ambient 160(1) 37.6(2) °C/W 1. This value depends from thermal design of PCB on which the device is mounted. 2. This value depends from the 4-layer PCB, JEDEC standard test board. Table 8. Electrical characteristics Value Symbol Parameter Test condition(1) TA = 25°C Min VI Operating voltage ID = 1 mA ICC ON quiescent supply current I(CCOFF) 6/17 OFF quiescent supply current VI = 5 V, ON = GND IO = 0 Typ 2.7 13 Unit Max 5.5 V 25 μA ON = IN VI = VOUT = 5.5 V 1 ON = IN VI = 5.5 V VO = 0 5 μA ST890B, ST890C, ST890D Table 8. Maximum rating Electrical characteristics (continued) Value Symbol Parameter VULO Undervoltage lockout VHYST Undervoltage lockout hysteresis RON VSET IMAX ISC ILIM/ISET ON resistance Test condition(1) Rising edge Min Typ Max 2.0 2.4 2.6 V mV VI = 4.5 V 75 120 mΩ VI = 3 V 90 130 mΩ 1.24 1.302 Reference voltage IO = 100 mA to turn the switch VSET rise until VI - VO > OFF 0.8V 1.178 V Maximum programmable output over current limit Short circuit current limit Unit 100 1.2 A VI = 5V, OUT connected to GND, device enabled into short circuit ILIM to ISET current IO = 500 mA ratio VO > 1.6 V VIL ON input low level VI = 2.7 to 5.5 V voltage VIH ON input high level voltage 970 1.2 ILIM 1.5 ILIM 1110 1300 0.8 A V VI = 2.7 to 3.6 V 2.0 V VI = 2.7 to 5.5 V 2.4 V ON input leakage current VI = 5.5 V ISET bias ISET bias current VSET = 1.24 V IO = 0A VI = VO VOL FAULT output low voltage IOH FAULT output high VFAULT = 5.5 V voltage VSET = 1 V II TA = 25°C ISINK = 1 mA VSET = 1.4 V 0.5 1 μA 3 μA 0.15 V 1 μA TPROT Thermal protection 130 °C THYST Thermal hysteresis 15 °C 1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25°C 7/17 Maximum rating ST890B, ST890C, ST890D Table 9. Timing characteristics Value Symbol Test condition(1) Parameter TA = 25°C Min Slow current loop response time tRESP tON 20% current overdrive, VCC = 5 V Fast current loop response time Unit Typ Max 5 μs 2 μs VI = 5 V IO = 500 mA 25 VI = 3 V IO = 500 mA 50 50 Turn ON time tOFF Turn OFF time VI = 5 V 1 μs 2 10 1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 °C Figure 4. Typical application circuit INPUT 100 k Ω IN OUT IN OUT /FAULT /ON GND SET OUTPUT 0.1μF ON/OFF 1μF R SET CS00027 8/17 μs μs ST890B, ST890C, ST890D 2.1 Maximum rating Typical performance characteristics Unless otherwise specified Tj = 25 °C. Figure 5. ON resistance vs. supply voltage Figure 6. ON resistance vs. temperature 9/17 Maximum rating Figure 7. VCC=5V, R L=0.6Ω 10/17 ST890B, ST890C, ST890D Switching waveforms VCC=5V, R L=0.32Ω ST890B, ST890C, ST890D 3 Package mechanical data Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK® packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com. Figure 8. SO-8 package drawing 0016023/C 1. Drawing not to scale. 11/17 Package mechanical data Table 10. ST890B, ST890C, ST890D SO-8 package mechanical data millimeters inches Symbol Min Typ Max Min Max A 1.35 1.75 0.053 0.069 A1 0.10 0.25 0.04 0.010 A2 1.10 1.65 0.043 0.065 B 0.33 0.51 0.013 0.020 C 0.19 0.25 0.007 0.010 D 4.80 5.00 0.189 0.197 E 3.80 4.00 0.150 0.157 e 1.27 0.050 H 5.80 6.20 0.228 0.244 h 0.25 0.50 0.010 0.020 L 0.40 1.27 0.016 0.050 k ddd 12/17 Typ 8°(max) 0.1 0.04 ST890B, ST890C, ST890D Figure 9. Package mechanical data SO-8 tape and reel specifications 1. Drawing not to scale. Table 11. SO-8 tape and reel mechanical data millimeters inches Symbol Min A Typ Max Min 330 Max 12.992 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 Typ 0.504 22.4 0.519 0.882 Ao 8.1 8.5 0.319 0.335 Bo 5.5 5.9 0.216 0.232 Ko 2.1 2.3 0.082 0.090 Po 3.9 4.1 0.153 0.161 P 7.9 8.1 0.311 0.319 13/17 Package mechanical data ST890B, ST890C, ST890D Figure 10. DFN8L (3 x 3 mm) package drawing PO8092726_A 1. Drawing is not to scale. 2. Dimensions in millimeters. 14/17 ST890B, ST890C, ST890D Table 12. Package mechanical data DFN8L (3 x 3 mm) package mechanical data millimeters Symbol Min Typ Max A 0.80 0.85 0.90 A1 0 0.02 0.05 b 0.25 0.030 0.35 D 2.95 3 3.05 D2 2.30 2.40 2.50 E 2.95 3 3.05 E2 1.70 1.80 1.90 e L 0.65 0.25 0.30 0.35 Figure 11. DFN8L (3 x 3 mm) footprint recommendations FR8092726_A 1. Drawing not to scale. 2. Dimensions in millimeters. 15/17 Revision history 4 ST890B, ST890C, ST890D Revision history Table 13. Document revision history Date Revision 22-Jul-2005 4 Added 3 rows on Table 2 on page 3 10-Aug-2007 5 Removed ST890CD and ST890BD from Table 1 on page 1 Updated short circuit current limit value in Table 8 on page 6 6 Added Section : Contents. Added ST890D and related DFN8L package information. Added Figure 2: DFN8L (3 x 3 mm) pin connection (top view) on page 4. Figure 3: Schematic diagram on page 5: redrawn, no content change. Modified title in Table 5: Truth table for FAULT on page 5. Updated Table 8: Electrical characteristics on page 6. Figure 4: Typical application circuit on page 8: redrawn, no content change 1-Dec-2007 16/17 Changes ST890B, ST890C, ST890D Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. 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