Si91860 Vishay Siliconix 400-mA Smart Regulator for Network Interface Card FEATURES D D D D D D D D Single Fixed 3.3-V Output Linear Regulator for Dual Power Inputs Auxilliary Input Can Be Bypassed Automatically Switches Between Linear Regulator and Bypass Mode Linear Regulator: 3.3-V "3% Output at 400-mA Current Linear Regulator: 600-mA Peak Output Current Low Bypass Switch Drop: <55-mV Drop at 150 mA Built-in Short Circuit and Thermal Shutdown Protection D Low Supply Current D SOIC-8 Package APPLICATIONS D D D D Network Interface Cards (NIC) PCMCIA Cards Cardbus Desktop Computers/Workstations DESCRIPTION The Si91860 provides a constant 3.3-V output with multiple inputs. This function is required in many power interface applications, such as the Network Interface Card (NIC). The Si91860 is offered in small SOIC-8 package with up to 2-W Power handling capability. The complete application circuit uses only four external components. The PCI Card has a 3.3-V Chipset while the PCI bus has two independent 5-V sources. When needed, the two 5-V sources are available from the PCI bus or directly from the motherboard—normally 5 VIN and standby 5 VSB. The internal regulator steps down from either of the 5-V supplies to 3.3 V. A 200-mΩ power switch is integrated to connect the 3.3-VAUX input to the output. The power drawn priority is 5 VIN > 5 VSB > 3.3 VAUX, where the selection is done internally and automatically by the Si91860. The power handling capability is as such as to carry at least 400-mA continuous load current for any power input condition. In order to satisfy the stringent ambient temperature requirements in many applications, the Si91860 is rated for the industrial temperature range of −40_C to 85_C. The Si91860 is available in both standard and lead (Pb)-free packages. FUNCTIONAL BLOCK DIAGRAM Si91860 5 VSB 5 VIN Regulator and Control 3.3 VOUT 3.3 VAUX GND Document Number: 71340 S-40704—Rev. B, 19-Apr-04 www.vishay.com 1 Si91860 Vishay Siliconix ABSOLUTE MAXIMUM RATINGS Pin 1, 2, 4 Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 6 V Linear Regulator Output Current (peak) . . . . . . . . . . . . . . . . . . . . . . . . 600 mA Bypass Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 600 mA Maximum Junction Temperature, TJ(max) . . . . . . . . . . . . . . . . . . . . . . . . 150_C Storage Temperature, TSTG . . . . . . . . . . . . . . . . . . . . . . . . . . −55_C to 150_C ESD (Human Body Model) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 kV Package Power Dissipationb PD . . . . . . . . . . . . . . . . . . . . . . . . 2W (internally limited via thermal shutdown) Thermal Impedance (JA)a . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62.5_C/W Notes a. Device mounted with all leads soldered or welded to PC board. b. Derate 16 mW/_C above TA = 25_C Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. RECOMMENDED OPERATING RANGE 5-VIN and 5-VSB Pin Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5 V to 5.5 V Load Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 mA to 400 mA 3.3-VAUX Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 V to 3.6 V Operating Ambient Temperature, TA . . . . . . . . . . . . . . . . . . . . −40_C to 85_C SPECIFICATIONS Test Conditions Unless Otherwise Specified Parameter Symbol Limits −40 to 85_C 5 VIN = 5 VSB = 5 V, V 3 VAUX = 3 3.30 30 V IOUT = 1 mA, CIN = 4.7 F, COUT = 2.2 F Tempa Minb Typc Maxb 0 mA < IOUT < 400 mA, 4.5 V < 5 VIN 5 VSB < 5.5 V Full 3.201 3.3 3.399 4.30 4.475 Unit Regulator Mode Output Voltage (Regulator) VO(LDO) 5 VIN Select Rising Edge of Hysteresis 5 VSB Select Full Hysteresis Full 230 Threshold Full 4.30 Hysteresis Full 230 Full 0.3 0.8 Full 0.7 1.6 IO tPW = 2 ms Full eN BW = 50 Hz to100 kHz, IOUT = 150 mA Peak Output Current (Regulator) Output Noise Voltage (Regulator) 3.3 3 3 VOUT VIN Room 300 Room 60 10 kHz Room 40 100 kHz Room 30 Dynamic Line Regulation VO(line) VIN: 4.5 V to 5.5 V tR/tF = 2 s, IOUT = 150 mA Room 10 Dynamic Load Regulation VO(load) IOUT: 1 mA to 150 mA, tR/tF = 2 s Room 20 VOUT Turn-On-Time mA 600 1 kHz IOUT = 150 mA V mV IO = 0 mA IGND V mV 4.475 IO = 400 mA Ground Pin Current In Regulator MODEd Ripple pp Rejection j (Regulator) ( g ) Threshold tON Room 15 Thermal Shutdown Junction Temperature TJ(s/d) Full 165 Thermal Hysteresis THYST Full 20 Short Circuit Current ISC 3.3 VOUT = 0 V Room 900 V(rms) dB mV s _C C mA Bypass Mode (5 VIN = 5 VSB = GND) Output Voltage VO(BP) 0 mA < IOUT < 150 mA Full Bypass Switch On-Resistance rDS(on) 3.0 V v VAUX v 3.6 V Full 0.2 0.35 IGND 0 mA < IOUT < 400 mA Full 200 400 A Ground Currentd 3.247 V Notes a. Room = 25_C, Full = −40 to 85_C. b. The algebraic convention whereby the most negative value is a minimum and the most positive a maximum. c. Typical values are for DESIGN AID ONLY, not guaranteed nor subject to production testing. Typical values at 25_C ambient. d. Ground pin current includes the IC supply current and the current to drive the linear regulator or bypass switch. www.vishay.com 2 Document Number: 71340 S-40704—Rev. B, 19-Apr-04 Si91860 Vishay Siliconix TIMING WAVEFORMS 5V tON VIN 0.95 VOUT VOUT FIGURE 1. Timing Diagram PIN CONFIGURATION SO-8 5 VSB 1 8 GND 5 VIN 2 7 GND 3.3 VOUT 3 6 GND 3.3 VAUX 4 5 GND Top View PIN DESCRIPTION Document Number: 71340 S-40704—Rev. B, 19-Apr-04 Pin Number Name Function 1 5 VSB Secondary power input for the Regulator 2 5 VIN Primary power input for the Regulator 3 3.3 VOUT Output 3.3 V 4 3.3 VAUX Power input for the bypass function 5, 6, 7, 8 GND Grounds www.vishay.com 3 Si91860 Vishay Siliconix ORDERING INFORMATION Part Number Temperature Range Package Si91860DY-T1 Si91860DY-T1—E3 Tape and Reel −40 to 85_C Si91860DY Bulk Eval Kit Temperature Range Board Type Si91860DB −40 to 85_C Surface Mount TYPICAL CHARACTERISTICS 1.0 Ground Current vs Temperature (5 VIN or 5 VSB) Ground Current vs Input Voltage (5 VIN or 5 VSB) 1.0 IOUT = 0 IOUT = 600 mA IOUT = 400 mA 0.6 Ground Current (mA) Ground Current (mA) 3.3 VAUX = 0 V 0.8 0.8 IOUT = 200 mA 0.4 IOUT = 0 mA 0.6 0.4 0.2 0.2 5 VIN or 5 VSB = 5 V 0.0 −40 0.0 −20 0 20 40 Temperature 0.35 60 80 0 100 ON-Resistance vs 3.3 VAUX Input Voltage 0.8 Ground Current (mA) Resistance (Ω) 85_C 0.20 25_C −40_C 0.15 3.1 3.2 3.3 3.4 3.3 VAUX Input Voltage (V) 4 3 4 5 6 Ground Current vs 3.3 VAUX Input Voltage 0.6 0.25 www.vishay.com 2 Input Voltage (V) 0.30 0.10 3.0 1 (oC) 3.5 3.6 5 VIN 5 V 0.4 0.2 0.0 0.0 5 VIN 5 VSB 0 V 0.6 1.2 1.8 2.4 3.0 3.6 3.3 VAUX Input Voltage (V) Document Number: 71340 S-40704—Rev. B, 19-Apr-04 Si91860 Vishay Siliconix TYPICAL WAVEFORMS Load Transient Response-1 VOUT = 10 mV/div Load Transient Response-2 VOUT = 10 mV/div IOUT = 100 mA/div IOUT = 100 mA/div Input = 5 VIN or 5 VSB IOUT = 1 to 150 mA trise = 2 sec Input = 5 VIN or 5 VSB IOUT = 150 to 1 mA tFALL= 2 sec M 5.00 s Load Transient Response-3 Load Transient Response-4 VOUT = 50 mV/div VOUT = 50 mV/div IOUT = 200 mA/div IOUT = 200 mA/div Input = 5 VIN or 5 VSB IOUT = 0 to 400 mA trise = 2 sec M 5.00 s Input = 5 VIN or 5 VSB IOUT = 400 to 0 mA tFALL = 2 sec 5 VIN Power Up (5 VSB = 5 V) 5 VSB 200 mV/div (offset = 5 V) M 5.00 s M 5.00 s 5 VIN Power Down (5 VSB = 5 V) 5 VSB 200 mV/div (offset = 5 V) 3.3 VOUT (100 mV/div) 3.3 VOUT (100 mV/div) 5 VIN 500 mV/div (offset = 4.3 V) 5 VIN 500 mV/div (offset = 4.2 V) 5 VSB = 5 V 3.3 VAUX = 0 V IOUT = 400 mA Document Number: 71340 S-40704—Rev. B, 19-Apr-04 M 5.00 s 5 VSB = 5 V 3.3 VAUX = 0 V IOUT = 400 mA M 5.00 s www.vishay.com 5 Si91860 Vishay Siliconix TYPICAL WAVEFORMS 5 VIN Power Down (3.3 VAUX = 3.3 V) 3.3 V 200 AUXmV/div (offset = 3.3 V) 5 VIN Power Up (3.3 VAUX = 3.3 V) 3.3 VAUX 200 mV/div (offset = 3.3 V) 3.3 VOUT (100 mV/div) 3.3 VOUT (100 mV/div) 5 VIN 500 mV/div (offset = 4.3 V) 5 VIN 500 mV/div (offset = 4.2 V) 5 VSB = 0 V 3.3 VAUX = 3.3 V IOUT = 400 mA 5 VSB = 0 V 3.3 VAUX = 3.3 V IOUT = 400 mA M 5.00 s Line Transient −1 (5 VIN and 5 VSB) M 5.00 s Line Transient −2 (5 VIN and 5 VSB) 5 VIN (1 V/div) 5 VIN (2 V/div) 3.3 VOUT (10 mV/div) 3.3 VOUT (10 mV/div) 5 VIN = 4.5 to 5.5 V IOUT = 150 mA TRISE = 5 µsec 5 VIN = 5.5 to 4.5 V IOUT = 150 mA TTALL = 5 µsec M 5.00 s M 5.00 s Power Supply Ripple Rejection vs. Frequency 0 5 VIN = 5.0 V) ILOAD = 150 mA −10 −20 −30 PSRR −40 −50 PSRR(dB) −60 −70 −80 1 10 100 1K 10 K 100 K 1M Frequency (Hz) www.vishay.com 6 Document Number: 71340 S-40704—Rev. B, 19-Apr-04 Si91860 Vishay Siliconix BLOCK DIAGRAMS AND TYPICAL APPLICATION CIRCUIT Si91860 1 5 VSB 4.7 µF 5 VSB Regulator Driver 5 VIN 2 3 4.7 µF 3.3 VOUT 2.2 µF 5 VIN Regulator Driver 4 3.3 VAUX 4.7 µF Logic Control 5, 6 7, 8 DETAIL DESCRIPTION During normal operation, the 5-VIN input powers the fixed 3.3-V output (3.3 VOUT) through an internal linear regulator. When 5 VIN falls below 4.07 V, the 3.3-V output is powered through the linear regulator from 5 VSB. If both 5 VIN and 5 VSB are below 4.07 V, then the output (3.3 VOUT) is powered from 3.3-VAUX input. The power drawn sequence is from 5 VIN, then 5 VSB and lastly 3.3 VAUX. If both 5 VIN and 5 VSB are above 4.30 V, then 5 VIN will power the output. The device prevents reverse current from flowing from the output to any unbiased or low voltage input. Linear Regulator Mode The output is regulated at 3.3 V when either one of the 5-VIN or 5-VSB pins is more than 4.30 V. The 5 VIN takes precedence when both the 5-VIN and 5-VSB pins are more than valid threshold voltage (i.e. > 4.30 V). The linear regulator will regulate the output until both the 5-VIN and 5-VSB pins fall below 4.07 V. Document Number: 71340 S-40704—Rev. B, 19-Apr-04 Bypass Mode When both the 5-VIN and 5-VSB pins fall below 4.07 V, the output is powered by 3.3 VAUX through a 0.2- internal switch. Thermal and Over−current Protection Thermal protection limits total power dissipation in the device. It safeguards the device in the event of fault conditions. When the junction temperature exceeds 165_C, the device turns off. The device turns back on once its junction temperature cools down by approximately 20_C. The device has overcurrent protection (typically at 900 mA) when it operates in linear regulator mode. A continuous short at output pin (3.3 VOUT) will result in a pulsed output as the thermal protection circuitry cycles the device on and off. For continuous operation, do not exceed the junction rating of 150_C. In bypass mode, the device is not current limited. www.vishay.com 7 Legal Disclaimer Notice Vishay Notice Specifications of the products displayed herein are subject to change without notice. Vishay Intertechnology, Inc., or anyone on its behalf, assumes no responsibility or liability for any errors or inaccuracies. Information contained herein is intended to provide a product description only. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document. Except as provided in Vishay's terms and conditions of sale for such products, Vishay assumes no liability whatsoever, and disclaims any express or implied warranty, relating to sale and/or use of Vishay products including liability or warranties relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright, or other intellectual property right. The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications. Customers using or selling these products for use in such applications do so at their own risk and agree to fully indemnify Vishay for any damages resulting from such improper use or sale. Document Number: 91000 Revision: 08-Apr-05 www.vishay.com 1