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| ST890 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 m (typ.) ON resistance SO-8 and DFN8L (3 x 3 mm) packages DFN8L (3 x 3 mm) SO-8 Description Applications PCMCIA slots Access bus slots Portable equipment The ST890 is a low voltage, P-channel MOSFET power switch intended for high side load switching applications. The switch operates 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 ST890BDR ST890CDR ST890DTR Package SO-8 SO-8 DFN8L (3 x 3 mm) Packaging 2500 parts per reel 2500 parts per reel 3000 parts per reel March 2009 Rev 8 1/20 www.st.com 20 Contents ST890 Contents 1 2 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 2.1 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.1.1 2.1.2 2.1.3 2.1.4 2.1.5 Output current limit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Output short circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Programming ILIM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Fault pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Thermal protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 2.2 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3 4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 2/20 ST890 Device summary 1 Device summary Figure 1. SO-8 pin connection (top view) IN 1 IN 2 ON 3 GND 4 8 FAULT 7 OUT 6 OUT 5 SET CS07570 Table 2. Pin N. 1, 2 3 4 5 SO-8 pin description Symbol IN ON GND SET Name and function Input P-channel MOSFET source. Bypass IN with a 1 F 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 GND sets the current limit for the switch. RSET = 1.24x1110/ ILIM, where ILIM is the desired current limit in Amperes Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 F capacitor to ground Fault indicator output. This open drain output goes low when in current limit or when the die temperature exceeds 135C 6,7 OUT 8 FAULT 3/20 Device summary Figure 2. DFN8L (3 x 3 mm) pin connection (top view) ST890 IN IN ON GND 1 2 3 4 8 7 6 5 FAULT OUT OUT SET CS00025 Table 3. Pin N. 1, 2 3 4 5 DFN8L (3 x 3 mm) pin description Symbol IN ON GND SET Name and function Input P-channel MOSFET source. Bypass IN with a 1 F 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 GND sets the current limit for the switch. Switch output. P-channel MOSFET drain. Bypass OUT with a 0.1 F capacitor to ground. RSET = 1.24x1110/ILIM, where ILIM is the desired current limit in Amperes Fault indicator output. This open drain output goes low when in current limit or when the die temperature exceeds 135 C 6,7 OUT 8 FAULT 4/20 ST890 Figure 3. Schematic diagram Device summary IN OUT /FAULT ON + Replica amplifier + ON Current limit amplifier 1.24V SET /ON Control circuitry GND CS00026 Table 4. Truth table for ON/OFF switch ON/OFF L H OUT ON OFF Table 5. Truth table for FAULT FAULT H L FLAG Normal operation Fault condition 5/20 Maximum rating ST890 2 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. 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 Operating ambient temperature range Absolute maximum ratings 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 -40 to +85 Unit V V V V A C C Table 7. Thermal data Parameter Thermal resistance junction-ambient SO-8 160(1) DFN8L 37.6(2) Unit C/W Symbol Rthj-amb 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. Symbol Electrical characteristics Value Parameter Test condition(1) Min TA = 25C Typ Max 5.5 13 25 V A Unit VI ICC Operating voltage ID = 1 mA ON quiescent supply current VI = 5 V, ON = GND IO = 0 ON = IN VI = VOUT = 5.5 V ON = IN VI = 5.5 V VO = 0 2.7 1 A 5 I(CCOFF) OFF quiescent supply current 6/20 ST890 Table 8. Symbol Maximum rating Electrical characteristics (continued) Value Parameter Test condition(1) Min VULO VHYST RON Undervoltage lockout Undervoltage lockout hysteresis ON resistance VI = 4.5 V VI = 3 V VSET Reference voltage IO = 100 mA to turn the switch VSET rise until VI - VO > OFF 0.8V Maximum programmable output over current limit Short circuit current limit VI = 5V, OUT connected to GND, device enabled into short circuit 970 1.178 Rising edge 2.0 TA = 25C Typ 2.4 100 75 90 1.24 120 130 1.302 V 1.2 A Max 2.6 V mV m m Unit IMAX ISC 1.2 ILIM 1.5 ILIM A ILIM/ISET VIL VIH ILIM to ISET current IO = 500 mA ratio VO > 1.6 V ON input low level VI = 2.7 to 5.5 V voltage ON input high level voltage ON input leakage current ISET bias current FAULT output low voltage VI = 2.7 to 3.6 V VI = 2.7 to 5.5 V VI = 5.5 V VSET = 1.24 V IO = 0A VI = VO ISINK = 1 mA VSET = 1.4 V 1110 1300 0.8 V V V 1 A 2.0 2.4 II ISET bias 0.5 3 A VOL IOH TPROT THYST 0.15 1 130 15 V A C C FAULT output high VFAULT = 5.5 V voltage VSET = 1 V Thermal protection Thermal hysteresis 1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25C 7/20 Maximum rating Table 9. Timing characteristics Value Symbol Parameter Test condition(1) Min Slow current loop response time tRESP Fast current loop response time VI = 5 V IO = 500 mA tON Turn ON time VI = 3 V IO = 500 mA Turn OFF time VI = 5 V 1 50 2 10 20% current overdrive, VCC = 5 V TA = 25C Typ 5 2 25 50 Max ST890 Unit s s s s s tOFF 1. VIN = 3 V, TA = TMIN to TMAX, unless otherwise specified. Typical values are at TA = 25 C Figure 4. Typical application circuit INPUT IN OUT OUTPUT 100 k IN OUT ON/OFF 0.1F /FAULT 1F GND /ON SET R SET CS00027 8/20 ST890 Maximum rating 2.1 2.1.1 Functional description Output current limit ILIM is the output current that ST890 limits under the condition VO (output voltage) > 1.6 V. When ILIM is reached, the Fault pin is asserted. 2.1.2 Output short circuit protection The ST890 provides short circuit protection by limiting the output current during a short circuit event. Isc is the output short circuit current limit level (typ 1.2 x ILIM). When the output is short circuit such as VO < 1.6 V, the ST890 limits the output current to no more than the Isc level. When the output is short circuit, the Fault pin is asserted. 2.1.3 Programming ILIM The ST890's ILIM can be programmed through the external resistor, RSET connected at the SET pin (pin 5). ILIM is determined by the following relationships: Equation 1 ISET = VSET / R SET Equation 2 ILIM / ISET = 1110 therefore: Equation 3 R SET = 1.24 x 1110 / ILIM 2.1.4 Fault pin The Fault pin (pin 8) is an open drain active low output. This pin should be connected to an external pull-up resistor. The Fault pin is asserted low when: - - - IOUT reaches the programmed ILIM value A short circuit event occurs The device goes into thermal protection 2.1.5 Thermal protection The ST890's thermal protection is triggered to turn off the switch when the junction temperature exceeds 130C (typ). 9/20 Maximum rating ST890 2.2 Typical performance characteristics Unless otherwise specified Tj = 25 C. Figure 5. ON resistance vs. supply voltage Figure 6. ON resistance vs. temperature 10/20 ST890 Maximum rating Figure 7. Switching waveforms VCC=5V, R L=0.6 VCC=5V, R L=0.32 11/20 Package mechanical data ST890 3 Package mechanical data In order to meet environmental requirements, ST offers these devices in ECOPACK(R) 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. 12/20 ST890 Table 10. Symbol Min A A1 A2 B C D E e H h L k ddd 0.1 5.80 0.25 0.40 1.35 0.10 1.10 0.33 0.19 4.80 3.80 1.27 6.20 0.50 1.27 8(max) 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 Package mechanical data SO-8 package mechanical data millimeters inches Typ Max 0.069 0.010 0.065 0.020 0.010 0.197 0.157 0.050 0.244 0.020 0.050 0.04 13/20 Package mechanical data Figure 9. SO-8 tape and reel specifications ST890 1. Drawing not to scale. Table 11. Symbol SO-8 tape and reel mechanical data millimeters Min Typ Max 330 12.8 20.2 60 22.4 8.1 5.5 2.1 3.9 7.9 8.5 5.9 2.3 4.1 8.1 0.319 0.216 0.082 0.153 0.311 13.2 0.504 0.795 2.362 0.882 0.335 0.232 0.090 0.161 0.319 Min inches Typ Max 12.992 0.519 A C D N T Ao Bo Ko Po P 14/20 ST890 Figure 10. DFN8L (3 x 3 mm) package drawing Package mechanical data PO8092726_A 1. Drawing is not to scale. 2. Dimensions in millimeters. 15/20 Package mechanical data Table 12. DFN8L (3 x 3 mm) package mechanical data millimeters Symbol Min A A1 b D D2 E E2 e L 0.25 0.80 0 0.25 2.95 2.30 2.95 1.70 Typ 0.85 0.02 0.030 3 2.40 3 1.80 0.65 0.30 0.35 Max 0.90 0.05 0.35 3.05 2.50 3.05 1.90 ST890 Figure 11. DFN8L (3 x 3 mm) footprint recommendations FR8092726_A 1. Drawing not to scale. 2. Dimensions in millimeters. 16/20 ST890 Figure 12. DFN8L (3 x 3 mm) tape and reel specifications Package mechanical data 17/20 Package mechanical data Figure 13. DFN8L (3 x 3 mm) reel specifications ST890 18/20 ST890 Revision history 4 Revision history Table 13. Date 22-Jul-2005 10-Aug-2007 Document revision history Revision 4 5 Changes Added 3 rows on Table 2 on page 3 Removed ST890CD and ST890BD from Table 1 on page 1 Updated short circuit current limit value in Table 8 on page 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. Updated: Table 2 on page 3, Table 3 on page 4. Added: Section 2.1: Functional description on page 9 and Figure 12 on page 17. Replaced ST890B, ST890C and ST890D with ST890. Modified: Table 6: Absolute maximum ratings 1-Dec-2007 6 13-Oct-2008 7 04-Mar-2009 8 19/20 ST890 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. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST'S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST REPRESENTATIVE, ST PRODUCTS ARE NOT RECOMMENDED, AUTHORIZED OR WARRANTED FOR USE IN MILITARY, AIR CRAFT, SPACE, LIFE SAVING, OR LIFE SUSTAINING APPLICATIONS, NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY, DEATH, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE. ST PRODUCTS WHICH ARE NOT SPECIFIED AS "AUTOMOTIVE GRADE" MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER'S OWN RISK. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. (c) 2009 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 20/20 |
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