LTC3403 - LTC3403是1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

LTC3403是LINEAR凌力尔特公司的一款微功率降压产品，LTC3403是LTC3403是1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor，本站介绍了LTC3403的封装应用图解、特点和优点、功能等，并给出了与LTC3403相关的LINEAR元器件型号供参考。

LTC3403 - LTC3403是1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor - 微功率降压 - 电源管理 - 凌力尔特

LTC3403 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

LTC3403 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor - Linear Technology（凌力尔特）

功能描述

The LTC3403 is a high efficiency monolithic synchronous buck regulator optimized for WCDMA power amplifier applications. The output voltage can be dynamically programmed from 0.3V to 3.5V. At VOUT > 3.6V an internal bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor. Selectable forced continuous mode enables fast VOUT response to the controlling input.

Supply current is only 20µA in Burst Mode operation and drops to <1µA in shutdown. The 2.5V to 5V input voltage range makes the LTC3403 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems.

Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. The internal synchronous switch increases efficiency and eliminates the need for an external Schottky diode.

The LTC3403 is available in a low profile 8-lead 3mm x 3mm DFN package.

特点

Dynamically Adjustable Output from 0.3V to 3.5V

Very Low Quiescent Current: Only 20µA During Operation

600mA Output Current

Internal P-Channel MOSFET Bypass Transistor

High Efficiency: Up to 96%

1.5MHz Constant Frequency Operation

No Schottky Diode Required

Low Dropout Operation: 100% Duty Cycle

2.5V to 5V Input Voltage Range

Drives Optional External P-Channel MOSFET