SC173A View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SC173A' PDF : 26 Pages View PDF
SC173A
POWER MANAGEMENT
3A EcoSpeedTM Synchronous Step-Down
Regulator with Automatic Power Save
Features
VIN: 3V to 5.5V
VOUT: 0.75V to 95% x VIN
IOUT: Up to 3A
Low RDS(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
EcoSpeedTM 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 VIN. The device features low-RDS(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
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