LTC3704 Wide Input Range, No RSENSE™ Positive-to-Negative DC/DC Controller

The LTC®3704 is a wide input range, current mode, positive-to-negative DC/DC controller that drives an N-channel power MOSFET and requires very few external components. Intended for low to high power applications, it eliminates the need for a current sense resistor by utilizing the power MOSFET’s on-resistance, thereby maximizing efficiency.

The IC’s operating frequency can be set with an external resistor over a 50kHz to 1MHz range, and can be synchronized to an external clock using the MODE/SYNC pin. Burst Mode operation at light loads, a low minimum operating supply voltage of 2.5V and a low shutdown quiescent current of 10µA make the LTC3704 ideally suited for battery-operated systems.

For applications requiring constant frequency operation, the Burst Mode operation feature can be defeated using the MODE/SYNC pin. Higher than 36V switch voltage applications are possible with the LTC3704 by connecting the SENSE pin to a resistor in the source of the power MOSFET.

The LTC3704 is available in the 10-lead MSOP package

产品特点 Features

High Efficiency Operation (No Sense Resistor Required)
Wide Input Voltage Range: 2.5V to 36V
Current Mode Control Provides Excellent Transient Response
High Maximum Duty Cycle (Typ 92%)
±1% Internal Voltage Reference
±2% RUN Pin Threshold with 100mV Hysteresis
Micropower Shutdown: IQ = 10µA
Programmable Operating Frequency (50kHz to 1MHz) with One External Resistor
Synchronizable to an External Clock Up to 1.3 x fOSC
User-Controlled Pulse Skip or Burst Mode® Operation
Internal 5.2V Low Dropout Voltage Regulator
Capable of Operating with a Sense Resistor for High Output Voltage Applications (VDS>36V)
Small 10-Lead MSOP Package

应用

SLIC Power Supplies
Telecom Power Supplies
Portable Electronic Equipment
Cable and DSL Modems
Router Supplies

典型应用图

参数

LTC3704 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) *
LTC3704EMS	MSOP	10	E	$2.68	$1.85
LTC3704EMS#PBF	MSOP	10	E	$2.68	$1.85
LTC3704EMS#TR	MSOP	10	E		$1.91
LTC3704EMS#TRPBF	MSOP	10	E		$1.91
LTC3704IMS	MSOP	10	I	$2.93	$2.05
LTC3704IMS#PBF	MSOP	10	I	$2.93	$2.05
LTC3704IMS#TR	MSOP	10	I		$2.11
LTC3704IMS#TRPBF	MSOP	10	I		$2.11

LTC3704 数据手册及相关资料下载

数据手册(英文) : LTC3704 - Wide Input Range, No RSENSE Positive-to-Negative DC/DC Controller.PDF
可靠性数据 : R419 Reliability Data .PDF