LTC3801B Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT

The LTC®3801/LTC3801B are constant frequency current mode step-down DC/DC controllers in a low profile (1mm max) 6-lead SOT-23 (ThinSOT™) package. The parts provide excellent AC and DC load and line regulation with ±1.5% output voltage accuracy. The LTC3801 consumes only 195mA of quiescent current in normal operation, dropping to 16µA under no-load conditions.

The LTC3801/LTC3801B incorporate an undervoltage lockout feature that shuts down the device when the input voltage falls below 2.2V. The LTC3801 automatically switches into Burst Mode operation at light loads which enhances efficiency at low output current. In the LTC3801B, Burst Mode operation is disabled for lower output ripple at light loads.

To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High switching frequency of 550kHz allows the use of a small inductor

产品特点 Features

High Efficiency: Up to 94%
Very Low No-Load Quiescent Current: Only 16µA (LTC3801)
High Output Currents Easily Achieved
Internal Soft-Start
Wide VIN Range: 2.4V to 9.8V
Low Dropout: 100% Duty Cycle
Constant Frequency 550kHz Operation
Burst Mode® Operation for High Efficiency at Light Loads (LTC3801)
Burst Mode Operation Disabled for Lower Output Ripple at Light Loads (LTC3801B)
Output Voltage as Low as 0.8V
±1.5% Voltage Reference Accuracy
Current Mode Operation for Excellent Line and Load Transient Response
Only 6µA Supply Current in Shutdown (LTC3801)
Low Profile (1mm) SOT-23 Package

应用

1- or 2-Cell Li-Ion Battery-Powered Applications
Wireless Devices
Portable Computers
Distributed Power Systems

典型应用图

参数

LTC3801B 订购信息和价格参考Package Variations and Pricing

器件型号	封装	引脚	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3801BES6	SOT	6	E	$3.02
LTC3801BES6#TR	SOT	6	E	$3.02	$2.01
LTC3801BES6#TRM	SOT	6	E	$3.02	$2.03
LTC3801BES6#TRMPBF	SOT	6	E	$3.02	$2.03
LTC3801BES6#TRPBF	SOT	6	E	$3.02	$2.01
LTC3801ES6	SOT	6	E	$3.02
LTC3801ES6#TR	SOT	6	E	$3.02	$2.01
LTC3801ES6#TRM	SOT	6	E	$3.02	$2.03
LTC3801ES6#TRMPBF	SOT	6	E	$3.02	$2.03
LTC3801ES6#TRPBF	SOT	6	E	$3.02	$2.01

LTC3801B 数据手册及相关资料下载

数据手册(英文) : LTC3801/LTC3801B - Micropower Constant Frequency Step-Down DC/DC Controllers in ThinSOT.PDF
可靠性数据 : R380 Reliability Data .PDF