数据手册：MAX668, MAX669 灵活的转换架构提供升压、SEPIC、反激或隔离拓扑，MAX668输出电压仅受外部元件额定值的限制 .pdf [英文Rev.2(PDF,335.8kB)]
{状况：生产中。}
创建原理图或仿真器件，请使用EE-Sim： [MAX668][MAX669]
The MAX668/MAX669 constant-frequency, pulse-width modulating (PWM), current-mode DC-DC controllers are designed for a wide range of DC-DC conversion applications including step-up, SEPIC, flyback, and isolated-output configurations. Power levels of 20W or more can be controlled with conversion efficiencies of over 90%. The 1.8V to 28V input voltage range supports a wide range of battery and AC-powered inputs. An advanced BiCMOS design features low operating current (220µA), adjustable operating frequency (100kHz to 500kHz), soft-start, and a SYNC input allowing the MAX668/MAX669 oscillator to be locked to an external clock.
DC-DC conversion efficiency is optimized with a low 100mV current-sense voltage as well as with Maxim's proprietary Idle Mode™ control scheme. The controller operates in PWM mode at medium and heavy loads for lowest noise and optimum efficiency, then pulses only as needed (with reduced inductor current) to reduce operating current and maximize efficiency under light loads. A logic-level shutdown input is also included, reducing supply current to 3.5µA.
The MAX669, optimized for low input voltages with a guaranteed start-up voltage of 1.8V, requires boot-strapped operation (IC powered from boosted output). It supports output voltages up to 28V. The MAX668 operates with inputs as low as 3V and can be connected in either a bootstrapped or non-bootstrapped (IC powered from input supply or other source) configuration. When not bootstrapped, it has no restriction on output voltage. Both ICs are available in an extremely compact 10-pin µMAX® package.
产品关键特性
- 1.8V Minimum Start-Up Voltage (MAX669)
- Wide Input Voltage Range (1.8V to 28V)
- Tiny 10-Pin µMAX Package
- Current-Mode PWM and Idle Mode Operation
- Efficiency Over 90%
- Adjustable 100kHz to 500kHz Oscillator or SYNC Input
- 220µA Quiescent Current
- Logic-Level Shutdown
- Soft-Start
| 应用与使用范围
|
典型工作电路
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 |
| MAX668EUB | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX668EUB+ | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX668EUB+T | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX668EUB-T | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX669EUB | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX669EUB+ | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX669EUB+T | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX669EUB-T | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：否材料分析 |
| MAX669EUB/V+ | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
| MAX669EUB/V+T | 生产中 | µMAX；10引脚；15.4mm²封装信息 | -40°C至+85°C | RoHS/无铅：无铅材料分析 |
评估板与开发套件
相关芯片型号
