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EL7571 Datasheet(PDF) 1 Page - Renesas Technology Corp |
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EL7571 Datasheet(HTML) 1 Page - Renesas Technology Corp |
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1 / 19 page  FN7298 Rev 1.00 Page 1 of 19 October 25, 2004 FN7298 Rev 1.00 October 25, 2004 EL7571 Programmable PWM Controller DATASHEET The EL7571 is a flexible, high efficiency, current mode, PWM step down controller. It incorporates five bit DAC adjustable output voltage control which conforms to the Intel Voltage Regulation Module (VRM) Specification for Pentium® II and Pentium® Pro class processors. The controller employs synchronous rectification to deliver efficiencies greater than 90% over a wide range of supply voltages and load conditions. The on-board oscillator frequency is externally adjustable, or may be slaved to a system clock, allowing optimization of RFI performance in critical applications. In single supply operation, the high side FET driver supports boot-strapped operation. For maximum flexibility, system operation is possible from either a 5V rail, a single 12V rail, or dual supply rails with the controller operating from 12V and the power FETs from 5V. Pinout Features • Pentium® II Compatible • 5 bit DAC Controlled Output Voltage • Greater than 90% Efficiency • 4.5V to 12.6V Input Range • Dual NMOS Power FET Drivers • Fixed frequency, Current Mode Control • Adjustable Oscillator with External Sync. Capability • Synchronous Switching • Internal Soft-Start • User Adjustable Slope Compensation • Pulse by Pulse Current Limiting • 1% Typical Output Accuracy • Power Good Signal • Output Power Down • Over Voltage Protection • Pb-Free Available (RoHS Compliant) Applications • Pentium® II Voltage Regulation Modules (VRMs) • PC Motherboards • DC/DC Converters • GTL Bus Termination • Secondary Regulation 1 2 3 4 16 15 14 13 5 6 7 12 11 9 8 10 20 19 18 17 OTEN VID4 VID3 VID2 VID1 VIDO PWRGD REF COSC CSLOPE VH1 FB CS GND GNDP LSD VINP VIN LX HSD ENABLE POWER GOOD Voltage I.D. (VID (0:4)) C3 240pF C3 240pF C3 0.1µF 1.4V C6 0.1µF R2 5 D1 Q1 C8 1µF C1 1000µ F x3 L2 1.5µH 4.5V to 12.6V L1 5.1µH R2 5 C2 1000µF x6 C7 1µF Q2 D2 VOUT 1.3V to 3.5V Q1, Q2: Siliconix, Si4410, x2 C1: Sanyo, 16MV 1000GX, 1000µF x3 C2: Sanyo, 6MV 1000GX, 1000µF x6 L1: Pulse Engineering, PE-53700, 5.1µH L2: Micrometals, T30-26, 7T AWG #20, 1.5µH R1: Dale, WSL-25-12, 15m , x2 D1: BAV99 D2: IR, 32CTQ030 Ordering Information PART NUMBER PACKAGE TAPE AND REEL PKG. DWG. # EL7571CM 20-Pin SO - MDP0027 EL7571CM-T13 20-Pin SO 13” MDP0027 EL7571CMZ (See Note) 20-Pin SO (Pb-free) - MDP0027 EL7571CMZ-T13 (See Note) 20-Pin SO (Pb-free) 13” MDP0027 NOTE: Intersil Pb-free products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J STD-020C. |
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