LTC3701 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller

The LTC®3701 is a 2-phase dual constant frequency current mode step-down DC/DC controller providing excellent load and line regulation. Power loss and noise due to ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.

The LTC3701 provides a 0.8V ±2% voltage reference and consumes only 460µA of quiescent current. To further maximize the life of a battery source, the external P-channel MOSFET is turned on continuously in dropout (100% duty cycle).

Switching frequency is internally set at 550kHz, allowing the use of small inductors and capacitors. For noise sensitive applications, the LTC3701 can be externally synchronized using its phase-locked loop. The frequency can also be externally set from 300kHz to 750kHz by applying a voltage to the PLLLPF pin. Burst Mode operation is inhibited during synchronization or when the EXTCLK/MODE pin is pulled low to reduce noise and RF interference.

The LTC3701 contains independent internal soft-start circuitry for each controller. Other features include a power good output voltage monitor and output overvoltage and short-circuit protection.

The LTC3701 is available in a small footprint 16-lead narrow SSOP package

产品特点 Features

Out-of-Phase Controllers Reduce Required Input Capacitance
True PLL for Frequency Locking or Frequency Adjustment
Operating Frequency Range: 300kHz to 750kHz
Wide VIN Range: 2.5V to 10V
Constant Frequency Current Mode Architecture
Low Dropout: 100% Duty Cycle
Power Good Output Voltage Monitor
Internal Soft-Start Circuitry
Selectable Burst Mode®/Pulse Skipping Operation at Light Loads
Output Overvoltage Protection
Low Quiescent Current: 460µA
0.8V ±2% Voltage Reference
Small 16-Lead Narrow SSOP Package

参数

应用

One or Two Lithium-Ion Powered Applications
Notebook and Handheld Computers
Personal Digital Assistants
Portable Instruments
Distributed DC Power Systems

典型应用图

LTC3701 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) *
LTC3701EGN	SSOP	16	E	$4.02	$3.40
LTC3701EGN#PBF	SSOP	16	E	$4.02	$3.40
LTC3701EGN#TR	SSOP	16	E		$3.46
LTC3701EGN#TRPBF	SSOP	16	E		$3.46

LTC3701 数据手册及相关资料下载

数据手册(英文) : LTC3701 - 2-Phase, Low Input Voltage, Dual Step-Down DC/DC Controller.PDF
可靠性数据 : R540 Reliability Data .PDF