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MAX1761：小型、双路、高效率buck控制器，用于笔记本电脑

The MAX1761 dual pulse-width-modulation (PWM), step-down controller provides high efficiency, excellent transient response, and high DC output accuracy in an extremely compact circuit topology. These features are essential for stepping down high-voltage batteries to generate low-voltage CPU core, I/O, and chipset RAM supplies in PC board area critical applications, such as notebook computers and smart phones. Maxim's proprietary Quick-PWM™ quick-response, constant-on-time PWM control scheme handles wide input/output voltage ratios with ease and provides "instant-on" response to load transients while maintaining a relatively constant switching frequency. The MAX1761 achieves high efficiency at reduced cost by eliminating the current-sense resistor found in traditional current-mode PWMs. Efficiency is further enhanced by its ability to drive large synchronous-rectifier MOSFETs. The MAX1761 employs a complementary MOSFET output stage, which reduces component count by eliminating external bootstrap capacitors and diodes. Single-stage buck conversion allows this device to directly step down high-voltage batteries for the highest possible efficiency. Alternatively, two-stage conversion (stepping down the +5V system supply instead of the battery) at a higher switching frequency allows the minimum possible physical size. The MAX1761 is intended for CPU core, chipset, DRAM, or other low-voltage supplies. The MAX1761 is available in a 16-pin QSOP package. For applications requiring greater output power, refer to the MAX1715 data sheet. For a single-output version, refer to the MAX1762/MAX1791 data sheet.

关键特性 Free-Running On-Demand PWM Selectable Light-Load Pulse-Skipping Operation ±1% Total DC Error in Forced-PWM Mode 5V to 20V Input Range Flexible Output Voltages OUT1: Dual Mode™ Fixed 2.5V or 1V to 5.5V Adjustable OUT2: Dual Mode Fixed 1.8V or 1V to 5.5V Adjustable Output Undervoltage Protection Complementary Synchronous Buck No Current-Sense Resistor 4.65V at 25mA Linear Regulator Output 4µA V+ Shutdown Supply Current 5µA VL Shutdown Supply Current 950µA Quiescent Supply Current Tiny 16-Pin QSOP Package

MAX1761：典型应用电路 应用 1.8V/2.5V逻辑和I/O电源 数码相机 手持终端 笔记本电脑与PDA 智能电话

数据手册DataSheet

关键参数

开发工具

• MAX1761EVKIT

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