LTC3408 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor

The LTC®3408 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 0.08Ω bypass P-channel MOSFET connects VOUT directly to VIN, eliminating power loss through the inductor.

The input voltage range is 2.5V to 5V making the LTC3408 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 LTC3408 is available in a low profile (0.75mm) 8-lead 3mm × 3mm DFN package.

U.S. Patent Numbers: 5481178, 6580258, 6304066, 6127815, 6498466, 6611131

特点

Dynamically Adjustable Output from 0.3V to 3.5V
600mA Output Current
Internal 0.08 Ohm 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
Shutdown Mode Draws <1µA Supply Current
Current Mode Operation for Excellent Line and Load Transient Response
Overtemperature Protected
Available in 8-Lead 3mm x 3mm DFN Package

典型应用

应用

WCDMA Cell Phone Power Amplifiers
Wireless Modems

封装信息

**Order Information 订购型号**
器件型号	封装	温度	价格 (以 1 ~ 99 片为批量)	价格 (以 1000 片为批量) *
LTC3408EDD#PBF	3x3 DFN-8	E	$2.64	$1.90
LTC3408EDD#TRPBF	3x3 DFN-8	E		$2.02

演示电路板


器件型号	描述	价格
DC645A	LTC3408EDD \| WCDMA Cellular Phone Buck Regulator, VIN = 2.7V to 5.5V, VOUT = 600mA	联系凌力尔特