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IRU3137CS Datasheet(PDF) 1 Page - International Rectifier |
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IRU3137CS Datasheet(HTML) 1 Page - International Rectifier |
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1 / 19 page  IRU3137 1 Rev. 1.0 06/22/04 www.irf.com DESCRIPTION The IRU3137 controller IC is designed to provide a low cost and high performance synchronous Buck regulator for on-board DC to DC converter applications. The out- put voltage can be set as low as 0.8V and higher voltage can be obtained with an external voltage divider. High peak current gate drivers provide fast switching transi- tion for applications requiring high output current in the range of 15A to 20A. This device features an internal 200KHz oscillator, un- der-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the de- vice when an output short is detected. 1A Peak Output Drive Capability 0.8V Reference Voltage Shuts off both drivers at shorted output and shutdown Operating with single 5V or 12V supply voltage Stable with ceramic capacitors Internal 200KHz Oscillator Soft-Start Function Protects the output when control FET is shorted Synchronous Controller in 8-Pin Package PACKAGE ORDER INFORMATION FEATURES 8-PIN SYNCHRONOUS PWM CONTROLLER APPLICATIONS DDR Memory Application Low voltage distributed DC-DC Graphic Cards Low cost on-board DC to DC such as 5V to 2.5V, 1.8V or 0.8V TA (°C) DEVICE PACKAGE FREQUENCY 0 To 70 IRU3137CS 8-Pin Plastic SOIC NB (S) 200KHz Data Sheet No. PD94700 Figure 1 - Typical application of IRU3137. TYPICAL APPLICATION IRU3137 U1 Vcc Vc HDrv LDrv Fb Gnd Comp SS/SD C3 1uF C4 1uF C8 0.1uF C9 3300pF R4 30K Q1 IRF7832 Q2 IRF7832 R5 1K, 1% R3 2.15K L2 2.2uH L1 1uH C2 4x 150uF C1 47uF 2.5V @ 15A C7 3x 330uF 40m Ω, Poscap 12V 5V Optional D1 Optional |
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