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FSP3133SAG Datasheet(PDF) 1 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
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FSP3133SAG Datasheet(HTML) 1 Page - FOSLINK SEMICONDUCTOR CO.,LTD |
1 / 7 page PWM CONTROL 2A STEP-DOWN CONVERTER 2007-6-22 1/7 FSP3133 PIN ASSIGNMENT (Top View) PIN DESCRIPTION Pin Number Pin Name Pin Description 1 FB Feedback Pin 2 EN Enable Input Pin H: Normal operation(Step-down operation) L: Step-down operation stopped(All circuits deactivated) 3 OCSET Add an external resistor to set max output current 4 VCC IC power supply pin 5,6 OUTPUT Switch pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. 7,8 VSS GND pin TYPICAL APPLICATION PC Motherboard LCD Monitor Graphic Card DVD-Video Player Telecom Equipment ADSL Modem Printer and other Peripheral Equipment Microprocessor core supply Networking power supply VCC VSS VSS OUTPUT OUTPUT 8 7 6 5 1 2 3 4 FB EN OCSET GENERAL DESCRIPTION FSP3133 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier and internal PMOS. FSP3133 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM control circuit is able to vary the duty ratio linearly from 0 up to 100%. This converter also contains an error amplifier circuit as well as a soft-start circuit that prevents overshooting at startup. An enable function, an over current protect function and a short circuit protect function are built inside, and when OCP or SCP happens, the operation frequency will be reduced from 300KHz to 30KHz. Also, an internal compensation block is built in to minimum external component count. With the addition of an internal P-channel Power MOS, a coil, capacitors, and a diode connected externally, these ICs can function as step-down switching regulators. They serve as ideal power supply units for portable devices when coupled with the SOP8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 23V, it is also suitable for the operation via an AC adapter. FEATURES Input voltage: 3.6V to 23V. Output voltage: 0.8V to VCC. Duty ratio: 0% to 100% PWM control Oscillation frequency: 300KHz typ. Soft-start, Current limit, Enable function Thermal Shutdown function Built-in internal SW P-channel MOSFET SOP8L Package. |
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