MAX1651：5V/3.3V或可调、高效率、低压差、降压型DC-DC控制器

高效降压控制器，工作在4节至8节电池

The MAX1649/MAX1651 BiCMOS, step-down, DC-DC switching controllers provide high efficiency over loads ranging from 1mA to more than 2.5A. A unique, current-limited pulse-frequency-modulated (PFM) control scheme gives these devices the benefits of pulse-width-modulation (PWM) converters (high efficiency at heavy loads), while using only 100µA of supply current (vs. 2mA to 10mA for PWM converters). Dropout performance down to 300mV is provided by a high switch duty cycle (96.5%) and a low current-sense threshold (110mV). A high switching frequency (up to 300kHz) allows these devices to use miniature external components. The MAX1649/MAX1651 have dropout voltages less than 0.3V at 500mA and accept input voltages up to 16V. Output voltages are preset at 5V (MAX1649), or 3.3V (MAX1651). They can also be adjusted to any voltage from 1.5V to the input voltage by using two resistors. These step-down controllers drive external P-channel MOSFETs at loads greater than 12.5W. If less power is required, use the MAX639/MAX640/MAX653 step-down converters with on-chip FETs, which allow up to a 225mA load current.

关键特性

More than 90% Efficiency (10mA to 1.5A Loads)
More than 12.5W Output Power
Less than 0.3V Dropout Voltage at 500mA
100µA Max Quiescent Supply Current
5µA Max Shutdown Supply Current
16V Max Input Voltage
5V (MAX1649), 3.3V (MAX1651), or Adjustable Output Voltage
Current-Limited Control Scheme
Up to 300kHz Switching Frequency
Up to 96.5% Duty Cycle

MAX1649、MAX1651：典型工作电路

应用

5V至3.3V绿色PC应用
电池供电应用
高效降压转换器
PDA

数据手册DataSheet

语言	下载文件	备注
英文	MAX1649-MAX1651.pdf	Rev 3; 01/2010

关键参数

Part Number	V_IN (V)	V_IN (V)	V_OUT1 (V)	V_OUT1 (V)	Preset V_OUT (V)	Output Adjust. Method	I_OUT1 (A)	Switch Type	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	Budgetary Price
Part Number	min	max	min	max	Preset V_OUT (V)	Output Adjust. Method	max	Switch Type	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX1649	3	16	1.5	3.3	5	Preset Resistor	2.5	External	1	300	PDIP(N)/8 SOIC(N)/8	$2.13 @1k
MAX1651	3	16	1.5	3.3	3.3 5	Preset Resistor	2.5	External	1	300	PDIP(N)/8 SOIC(N)/8	$2.13 @1k

开发工具

MAX1649EVKIT

技术资料

Energy Management for Small Portable Systems

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX1651CPA	停止供货		PDIP(N),；8引脚；79.7mm²	0°C至+70°C	RoHS/无铅：否
MAX1651CSA	停止供货	MAX1651CSA+	SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX1651CSA+	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX1651CSA+T	生产中		SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：无铅
MAX1651CSA-T	停止供货	MAX1651CSA+T	SOIC(N),；8引脚；30.9mm²	0°C至+70°C	RoHS/无铅：否
MAX1651EPA	停止供货		PDIP(N),；8引脚；79.7mm²	-40°C至+85°C	RoHS/无铅：否
MAX1651ESA	最后一次购买		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1651ESA+	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1651ESA+T	生产中		SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1651ESA-T	停止供货	MAX1651ESA+T	SOIC(N),；8引脚；30.9mm²	-40°C至+85°C	RoHS/无铅：否
型号	状况	推荐替代产品	封装：类型引脚占位面积封装图编码/变更 *	温度	RoHS/无铅？
MAX1651MJA	停止供货				参考数据资料

MAX1649-MAX1651.pdf MAX1651

Energy Management for Small Portable Systems MAX604

典型工作电路 MAX1651