数据手册：MAX1761 .pdf [英文Rev.0(PDF,488kB)]
{状况：生产中。}
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.
产品关键特性
- 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
| 应用与使用范围
- 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
|
典型应用电路
芯片订购型号
| 订购型号 | 产品状态 | 封装形式 | 工作温度 | RoHS/无铅 |
| MAX1761EEE | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX1761EEE+ | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1761EEE+T | 生产中 | QSOP；16引脚；30.9mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX1761EEE-T | 生产中 | QSOP；16引脚封装信息 | -40°C至+85°C | 参考数据资料 |
功能接近器件
评估板与开发套件
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