SC174 Ver la hoja de datos (PDF) - Semtech Corporation
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componentes Descripción
Fabricante
SC174
Semtech Corporation
SC174 Datasheet PDF : 27 Pages
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SC174
POWER MANAGEMENT
4A EcoSpeedTM Synchronous Step-Down
Regulator with Optional Ultrasonic Power Save
Features
VIN: 3V to 5.5V
VOUT: 0.75V to 95% x VIN
IOUT: Up to 4A
Low RDS(ON) Switches
Up to 95% Peak Efficiency
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
Ultrasonic Power Save
Smart Power Save
Ultra-Small Lead-Free 3x3mm, 10-Pin MLPD Package
Fully WEEE and RoHS Compliant
Applications
Networking Equipment, Embedded Systems
Medical Equipment, Office Automation
Instrumentation, Portable Systems
Consumer Devices (DTV, Set-top Box, ... )
5V POL Converters
Description
The SC174 is an integrated, synchronous 4A EcoSpeedTM
step-down regulator, which incorporates Semtech’s
advanced, patented adaptive on-time architecture 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 switch-
es and optional PSAVE mode 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.
Disabling PSAVE operation reduces output voltage ripple
at light load for ceramic output capacitors.
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 en-
hanced MLPD-3x3mm 10-pin package.
Typical Application Circuit
3 to 5.5V
Enable /
Power Save
VIN
BST
LX
SC174
VDD
FB
PGOOD
EN/PSV
PGND
TON
AGND
VOUT = 0.75V to 95% VIN
Power Good
May 18 , 2010
© 2010 Semtech Corporation
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