LTC3419 Dual Monolithic 600mA Synchronous Step-Down Regulator

The LTC3419 is a dual, 2.25MHz, constant-frequency, synchronous step-down DC/DC converter in a tiny 3mm × 3mm DFN package. 100% duty cycle provides low dropout operation, extending battery life in portable systems. Low output voltages are supported with the 0.6V feedback reference voltage. Each regulator can supply 600mA output current.

The input voltage range is 2.5V to 5.5V, making it ideal for Li-Ion and USB powered applications. Supply current during operation is only 35µA and drops to <1µA in shutdown. A user-selectable mode input allows the user to trade off between high efficiency Burst Mode operation and pulse-skipping mode.

An internally set 2.25MHz switching frequency allows the use of tiny surface mount inductors and capacitors. Internal soft-start reduces inrush current during start-up. Both outputs are internally compensated to work with ceramic output capacitors. The LTC3419 is available in a low profile (0.75mm) 3mm × 3mm DFN package. The LTC3419 is also available in a fixed output voltage configuration selected via internal resistor dividers (see Table 2).

产品特点 Features

High Efficiency Dual Step-Down Outputs: Up to 96%
600mA Current per Channel at VIN = 3V
Only 35µA Quiescent Current During Operation (Both Channels)
2.25MHz Constant-Frequency Operation
2.5V to 5.5V Input Voltage Range
Low Dropout Operation: 100% Duty Cycle
No Schottky Diodes Required
Internally Compensated for All Ceramic Capacitors
Independent Internal Soft-Start for Each Channel
Available in Fixed Output Versions
Current Mode Operation for Excellent Line and Load Transient Response
0.6V Reference Allows Low Output Voltages
User-Selectable Burst Mode® Operation
Short-Circuit Protected
Ultralow Shutdown Current: IQ < 1µA
Available in Small MSOP or 3mm × 3mm DFN-8 Packages

应用

Cellular Telephones
Digital Still Cameras
Wireless and DSL Modems
Portable Media Players
PDAs/Palmtop PCs

典型应用图

参数

LTC3419 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) *
LTC3419EDD#PBF	DFN	8	E	$2.79	$1.95
LTC3419EDD#TRPBF	DFN	8	E		$2.01
LTC3419EDD-1#PBF	DFN	8	E	$2.79	$1.95
LTC3419EDD-1#TRPBF	DFN	8	E		$2.01
LTC3419EMS#PBF	MSOP	10	E	$2.79	$1.95
LTC3419EMS#TRPBF	MSOP	10	E		$2.01
LTC3419EMS-1#PBF	MSOP	10	E	$2.79	$1.95
LTC3419EMS-1#TRPBF	MSOP	10	E		$2.01
LTC3419IDD#PBF	DFN	8	I	$3.07	$2.15
LTC3419IDD#TRPBF	DFN	8	I		$2.21
LTC3419IDD-1#PBF	DFN	8	I	$3.07	$2.15
LTC3419IDD-1#TRPBF	DFN	8	I		$2.21
LTC3419IMS#PBF	MSOP	10	I	$3.07	$2.15
LTC3419IMS#TRPBF	MSOP	10	I		$2.21
LTC3419IMS-1#PBF	MSOP	10	I	$3.07	$2.15
LTC3419IMS-1#TRPBF	MSOP	10	I		$2.21

LTC3419 数据手册及相关资料下载

数据手册(英文) : LTC3419 - Dual Monolithic 600mA Synchronous Step-Down Regulator.PDF
设计要点 (英文) : Design Solutions 10 - Active Voltage Positioning Reduces Output Capacitors.PDF
可靠性数据 : R457 Reliability Data .PDF