MAX1734：低电压、降压型DC-DC转换器，SOT23封装 _ BDTIC 中国领先电子元器件代理商

MAX1734：低电压、降压型DC-DC转换器，SOT23封装

高效DC-DC方案，用于低压逻辑电路供电

The MAX1733/MAX1734 step-down DC-DC converters deliver over 250mA to outputs as low as 1.25V. These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency. These devices maintain extremely low quiescent supply current (40µA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination of features makes the MAX1733/ MAX1734 excellent high-efficiency alternatives to linear regulators in space-constrained applications. Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements. The MAX1733 provides an adjustable output voltage (1.25V to 2.0V). The MAX1734 provides factory-preset output voltages (see Selector Guide). Both are available in space-saving 5-pin SOT23 packages.

关键特性

250mA Guaranteed Output Current
Synchronous Rectifier for Over 90% Efficiency
Tiny 5-Pin SOT23 Package
40µA Quiescent Supply Current
0.01µA Logic-Controlled Shutdown
Up to 1.2MHz Switching Frequency
Fixed 1.8V or 1.5V Outputs (MAX1734)
Adjustable Output Voltage (MAX1733)
±1.5% Initial Accuracy
2.7V to 5.5V Input Range
Soft-Start Limits Startup Current

MAX1733、MAX1734：典型工作电路

应用

蜂窝电话
计算机：台式机、工作站和服务器
消费类音频
数码相机
全球定位系统(GPS)
掌上电脑
POS终端
无线数据
无线局域网(WLAN)

数据手册DataSheet

语言	下载文件	备注
英文	MAX1733-MAX1734.pdf	Rev 0; 09/2000

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	Synchronous Switching	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	Synchronous Switching	DC-DC Outputs	Oper. Freq. (kHz)	Package/Pins	See Notes
MAX1733	2.7	5.5	1.25	2	-	Resistor	0.25	Internal	Yes	1	1200	SOT/5	$1.89 @1k
MAX1734	2.7	5.5	1.5	1.8	1.5 1.8	Preset Resistor	0.25	Internal	Yes	1	1200	SOT/5	$1.89 @1k

开发工具

MAX1734EVKIT

技术资料

Using Ceramic Output Capacitors with the MAX1734 Voltage-Mode Buck Converter

订购型号

型号	状况	推荐替代产品	封装	温度	RoHS/无铅
MAX1734EUK15+	生产中		SOT,；5引脚；9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1734EUK15+T	生产中		SOT,；5引脚；9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1734EUK15-T	停止供货	MAX1734EUK15+T	SOT,；5引脚；9mm²	-40°C至+85°C	RoHS/无铅：否
MAX1734EUK18+	生产中		SOT,；5引脚；9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1734EUK18+T	生产中		SOT,；5引脚；9mm²	-40°C至+85°C	RoHS/无铅：无铅
MAX1734EUK18-T	停止供货	MAX1734EUK18+T	SOT,；5引脚；9mm²	-40°C至+85°C	RoHS/无铅：否

MAX1733-MAX1734.pdf MAX1734

Using Ceramic Output Capacitors with the MAX1734 Voltage-Mode Buck Converter MAX1734

典型工作电路 MAX1734