LTC3700 - LTC3700是Constant Frequency Step-Down DC/DC Controller with LDO Regulator

LTC3700是LINEAR凌力尔特公司的一款外部开关电源控制器产品，LTC3700是LTC3700是Constant Frequency Step-Down DC/DC Controller with LDO Regulator，本站介绍了LTC3700的封装应用图解、特点和优点、功能等，并给出了与LTC3700相关的LINEAR元器件型号供参考。

LTC3700 - LTC3700是Constant Frequency Step-Down DC/DC Controller with LDO Regulator - 外部开关电源控制器 - 电源管理 - 凌力尔特

LTC3700 - Constant Frequency Step-Down DC/DC Controller with LDO Regulator

LTC3700 - Constant Frequency Step-Down DC/DC Controller with LDO Regulator - Linear Technology（凌力尔特）

功能描述

The LTC3700 is a constant frequency current mode stepdown (buck) DC/DC controller with excellent AC and DC load and line regulation. The on-chip 150mA low dropout (LDO) linear regulator can be powered from the buck controller’s input supply, its own independent input supply or the buck regulator’s output. The buck controller incorporates an undervoltage lockout feature that shuts down the controller when the input voltage falls below 2.1V.

The buck regulator provides a ±2.5% output voltage accuracy. It consumes only 210µA of quiescent current in normal operation with the LDO consuming an additional 50µA. In shutdown, a mere 10µA (combined) is consumed.

For applications where efficiency is a prime consideration, the buck controller is configured for Burst Mode operation which enhances efficiency at low output current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). High constant operating frequency of 550kHz allows the use of a small external inductor.

The LDO is protected by both current limit and thermal shutdown circuits.

The LTC3700 is available in a tiny 10-pin MSOP.

特点

Dual Output Regulator in Tiny 10-Pin MSOP

High Efficiency: Up to 94%

Wide VIN Range: 2.65V to 9.8V

Constant Frequency 550kHz Operation

150mA LDO Regulator with Current Limit and Thermal Shutdown Protection

High Output Currents Easily Achieved

Burst Mode Operation at Light Load

Low Dropout: 100% Duty Cycle

Current Mode Operation for Excellent Line and Load Transient Response