SC173A Datasheet, PDF (1/26 Pages) Semtech Corporation – 3A EcoSpeedTM Synchronous Step-Down Regulator with Automatic Power Save

SC173A
POWER MANAGEMENT
3A EcoSpeed^TM Synchronous Step-Down
Regulator with Automatic Power Save
Features
 V_IN: 3V to 5.5V
 V_OUT: 0.75V to 95% x V_IN
 I_OUT: Up to 3A
 Low R_DS(ON) Switches
Up to 96% Peak Efficiency
 Enable High Threshold: 1V
Compatible with Low Voltage Logic
 High Output Accuracy
 Small Ceramic Capacitors
 Power Good Pin (Open-Drain)
 Patented Adaptive On-Time Control:
Excellent Transient Response
Programmable Pseudo-fixed Frequency
 Fault Protection Features:
Cycle-by-Cycle Current Limit
Short Circuit Protection
Over and Under Output Voltage Protection
Over-Temperature
 Internal Soft start
 Smart Power Save
 Ultra-Small Lead-Free 3x3mm, 10-Pin MLPD Package
 Fully WEEE and RoHS Compliant
Description
The SC173A is an integrated, synchronous 3A
EcoSpeed^TM step-down regulator, which incorporates
Semtech’s advanced, patented adaptive on-time archi-
tecture to achieve best-in-class performance in dynamic
point-of-load applications. The input voltage range is 3V
to 5.5V with a programmable output voltage from 0.75V
up to 95% x V_IN. The device features low-R_DS(ON) internal
switches and automatic power save for high efficiency
across the output load range.
Adaptive on-time control provides programmable pseu-
do-fixed frequency operation and excellent transient
performance. The switching frequency can be set from
200kHz to 1MHz - allowing the designer to reduce exter-
nal 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.
Applications
 Networking Equipment, Embedded Systems
 Medical Equipment, Office Automation
 Instrumentation, Portable Systems
 Consumer Devices (DTV, Set-top Box, ... )
 5V POL Converters
The device is available in a low profile, thermally en-
hanced MLPD-3x3mm 10-pin package.
Typical Application Circuit
3 to 5.5V
Enable
VIN
BST
LX
SC173A
VDD
FB
PGOOD
EN
PGND
TON
AGND
VOUT = 0.75V to 95% VIN
Power Good
December 16 , 2010
© 2010 Semtech Corporation