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

产品特点 Features

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

应用

WCDMA Cell Phone Power Amplifiers
Wireless Modems

典型应用图

参数

LTC3408 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) *
LTC3408EDD	DFN	8	E	$2.64	$1.90
LTC3408EDD#PBF	DFN	8	E	$2.64	$1.90
LTC3408EDD#TR	DFN	8	E		$2.02
LTC3408EDD#TRPBF	DFN	8	E		$2.02

LTC3408 数据手册及相关资料下载

数据手册(英文) : LTC3408 - 1.5MHz, 600mA Synchronous Step-Down Regulator with Bypass Transistor.PDF
可靠性数据 : R415 Reliability Data .PDF