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AP1537 Datasheet(PDF) 1 Page - Anachip Corp |
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AP1537 Datasheet(HTML) 1 Page - Anachip Corp |
1 / 7 page AP1537 PWM Control 3A Step-Down Converter This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of this product. No rights under any patent accompany the sale of the product. Rev. 1. 3 May 09, 2006 1/7 Features - Input voltage: 3.6V to 18V. - Output voltage: 0.8V to VCC. - Duty ratio: 0% to 100% PWM control - Oscillation frequency: 500KHz typ. - Soft-start, Current Limit, Enable function - Thermal Shutdown function - Built-in internal SW P-channel MOS - Low ESR output capacitor (Multi-layer chip capacitor (MLCC)) application - SOP-8L Pb-Free Package. Applications - PC Motherboard - LCD Monitor - Graphic Card - DVD-Video Player - Telecom Equipment - ADSL Modem - Printer and other Peripheral Equipment - Microprocessor core supply - Networking power supply General Description AP1537 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier, internal PMOS and etc. AP1537 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 overshoot 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 500KHz to 50KHz. 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 SOP–8L mini-package, providing such outstanding features as low current consumption. Since this converter can accommodate an input voltage up to 18V, it is also suitable for the operation via an AC adapter. Pin Assignments ) 1 2 3 4 8 7 6 5 FB Output Comp AP1537 Output EN Vss Vss VCC Pin Descriptions Name Pin Description FB 1 Feedback pin EN 2 Power-off pin H: Normal operation (Step-down operation) L: Step-down operation stopped (All circuits deactivated) Comp 3 Compensation pin VCC 4 IC power supply pin Output 5、6 Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI. VSS 7、8 GND Pin |
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