L6997S中文资料Step Down Controller for Low Voltage Operations数据手册ST规格书

描述 Description

The device is a high efficient solution for networking dc/dc modules and mobile applications compatible with 3.3V bus and 5V bus.
It's able to regulate an output voltage as low as 0.6V. The constant on time topology assures fast load transient response. The embedded voltage feed-forward provides nearly constant switching frequency operation in spite of a wide input voltage range.
An integrator can be introduced in the control loop to reduce the static output voltage error.
The remote sensing improves the static and dynamic regulation, recovering the wires voltage drop.
Pulse skipping technique reduces power consumption at light loads. Drivers current capability allows output currents in excess of 20A.

特性 Features

OVP,UVP LATCHED PROTECTIONS
REMOTE SENSING
POWER GOOD AND OVP SIGNALS
600µA TYP QUIESCENT CURRENT
94% EFFICIENCY FROM 3.3V TO 2.5V
PULSE SKIPPING AT LIGTH LOADS
SELECTABLE SINKING MODE
0.6V, ±1% VREF
FROM 3V TO 5.5V V
CC RANGE
1V TO 35V INPUT VOLTAGE RANGE
MINIMUM OUTPUT VOLTAGE AS LOW AS 0.6V
VERY FAST LOAD TRANSIENTS
LOSSLESS CURRENT LIMIT, AVAILABLE ALSO IN SINKING MODE
CONSTANT ON TIME TOPOLOGY

简介

L6997S属于集成电路（IC）的PMIC-稳压器-DCDC开关式控制器。由ST制造生产的L6997SDC-DC 开关控制器PMIC（电源管理集成电路）DC 到 DC 开关式控制器是用于高效率电路的稳压 IC，其配置为生成高于（突升或步升）或低于（突降或步降）输入电源的输出电源电压。其他拓扑结构可能包括：降压-升压、反激、正激、Cuk、SEPIC、全桥、半桥和推挽式。这些器件不同于需要最小电压并“烧尽”多余电压的线性稳压器。