原标题：Semtech SC410 3A EcoSpeed降压电源稳压方案

　　Semtech 公司的SC410是3A EcoSpeed降压电源稳压器,输入电压5.5V-24V,输出电压0.75V到7.5V,输出电流高达3A,内部基准精度1%,主要应用在网络设备,嵌入式系统,医疗设备,办公自动化,仪表和手持系统,消费类电子如TV和STB,POL转换器.本文介绍了SC410主要特性, 方框图,多种典型应用电路图和PCB布局图.

　　3A EcoSpeed TM Step-Down Regulator with LDO and Ultrasonic Power Save

　　The SC410 is an integrated, synchronous 3A EcoSpeedTM step-down regulator. It incorporates Semtech’s advanced, patented adaptive on-time architecture to achieve bestin- class dynamic performance using point-of-load applications.

　　The input voltage range is 5.5V to 24V with a programmable output voltage from 0.75V up to 7.5V. The device features an internal LDO and ultrasonic PSAVE mode for high efficiency across the output load range.

　　Adaptive on-time control provides programmable pseudo-fixed frequency operation in continuous conduction and excellent transient performance. The switching frequency can be set from 200kHz to 1MHz, allowing the designer to reduce external LC filtering and minimize light load (standby) losses.

　　Additional features include cycle-by-cycle current limit, soft start, input UVLO and output OV protection, and over temperature protection. The open-drain PGOOD pin provides output status. Standby current is less than 10μA when disabled.

　　The device is available in a low profile, thermally enhanced MLPD 3 x 3mm 10-pin package.

　　SC410主要特性:

　　Input voltage — 5.5V to 24V

　　Output voltage — 0.75V to 7.5V

　　Output current — Up to 3A

　　Internal reference — + 1%

　　Small ceramic capacitors

　　Power good pin (open-drain)

　　Patented adaptive on-time control:Excellent transient response

　　Programmable pseudo-fixed frequency during CCM

　　Fault protection features:

　　Cycle-by-cycle current limit

　　Short circuit protection

　　Over and under output voltage protection

　　Over-temperature

　　Internal soft-start

　　Ultrasonic power save and smart PSAVE

　　Internal LDO for bias voltage

　　Ultra-small lead-free 3 x 3mm, 10-Pin MLPD package

　　WEEE and RoHS compliant

　　SC410应用:

　　Networking Equipment, Embedded Systems

　　Medical Equipment, Offi ce Automation

　　Instrumentation, Portable Systems

　　Consumer Devices such as DTV and Set-top Boxes

　　POL Converters

　　图1.SC410方框图

　　图2.SC410典型应用电路图

　　图3.SC410典型应用电路图(2)

　　图4.SC410典型应用电路图(3)