LTC1708-PG Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck DC/DC Regulator Controller

The LTC®1708 is a dual adjustable 5-bit VID programmable step-down switching regulator controller that drives all N-Channel power MOSFET stages. A constant frequency current mode architecture allows adjustment of the frequency up to 300kHz. Power loss and noise due to the ESR of the input capacitance are minimized by operating the two main controller output stages out of phase.

OPTI-LOOP compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The precision 0.8V reference is compatible with future microprocessor generations, and a wide 3.5V to 30V (36V maximum) input supply range that encompasses all battery chemistries. A power good output indicates when the output voltages are within 7.5% of their programmed value.

A RUN/SS pin for each controller provides both soft-start and an optional timed, short-circuit shutdown. Other protection features include: internal foldback current limiting and an output overvoltage crowbar. The forced continuous control pin (FCB) can be used to inhibit BurstMode operation or to regulate a third, flyback output.

产品特点 Features

Out-of-Phase Controllers Reduce Input Capacitance and Power Supply Induced Noise
OPTI-LOOP® Compensation Minimizes COUT
Power Good Output Monitors Both Outputs
5-Bit Mobile VID Control, VOUT: 0.9V to 2.0V
Dual N-Channel MOSFET Synchronous Drive
±1% Output Voltage Accuracy
DC Programmed Fixed Frequency 150kHz to 300kHz
Wide VIN Range: 3.5V to 36V Operation
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Latched Short-Circuit Shutdown with Defeat Option
Output Overvoltage Protection
Remote Output Voltage Sense
Low Shutdown Current: 20µA
5V and 3.3V Standby Regulators
Selectable Constant Frequency, Burst Mode® and Continuous Operation

应用

Notebook and Palmtop Computers, PDAs
Portable Instruments

典型应用图

参数

LTC1708-PG 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) *
LTC1708EG-PG	SSOP	36	E	$5.45	$4.60
LTC1708EG-PG#PBF	SSOP	36	E	$5.45	$4.60
LTC1708EG-PG#TR	SSOP	36	E		$4.70
LTC1708EG-PG#TRPBF	SSOP	36	E		$4.70

LTC1708-PG 数据手册及相关资料下载

数据手册(英文) : LTC1708-PG - Dual Adjustable 5-Bit VID High Efficiency, 2-Phase Current Mode Synchronous Buck DC/DC Regulator Controller.PDF
设计要点 (英文) : DN311 - Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs.PDF
设计要点 (中文) : DN311 Dual Output Supply Powers FPGAs from 3.3V and 5V Inputs.PDF
可靠性数据 : R384 Reliability Data .PDF