SC21152 Datasheet, PDF (1/18 Pages) Semtech Corporation – Tiny 1.2A Synchronous Buck Regulator with Power Good

POWER MANAGEMENT
Features
 Input voltage range — 2.3V to 5.5V
 1.2A continuous output current
 4MHz switching frequency
 Adjustable Output Voltage
 1% output voltage accuracy
 Adaptive On-Time architecture
 Up to 100% duty cycle
 Up to 96% peak efficiency
 Power Save mode for efficient light load operation
 >90% efficiency 30mA to 75mA
 0.1μA shutdown current
 21μA quiescent current
 Power Good Indicator
 Pre-bias startup protection
 Internal soft start
 1.5mm x 2mm, 6-Lead MLPD package
 WEEE and RoHS compliant and halogen-free
Applications
 Tablet PCs
 GPS devices
 Battery powered equipment
 Portable devices
 Smart Phones
 Wearable Electronics
Typical Application Circuit
SC21152
Tiny 1.2A Synchronous Buck
Regulator with Power Good
Description
The SC21152 is an ultra high efficiency 1.2A DC/DC buck
regulator available in a small MLPD package. These fea-
tures make the SC21152 perfect for small form factor con-
sumer applications where high efficiency is essential.
SC21152 is an Adaptive On-Time 4MHz switching regula-
tor at full load conditions. Under light load conditions it
transitions into PFM Power Save Mode and reduces switch-
ing frequency thus saving energy. High switching fre-
quency operation allows the use of a very small 0.47μH
inductor along with small input and output capacitors to
minimize overall circuit size.
The SC21152 is highly configurable with a wide range of
factory options including internal soft start time, fixed or
adjustable output voltage, automatic output discharge,
and switching frequency.
The SC21152 is offered in a small 6-Lead 1.5mm x 2mm
MLPD package.
2.3V-5.5V Supply
Power
Good
4.7µF
Fixed Output Voltage
VIN
LX
SC21152
1.2A
0.47µH Output
10µF
PG
FB
EN
EN
GND
Adjustable Output Voltage
2.3V-5.5V Supply
Power
Good
4.7µF
VIN
LX
SC21152
1.2A
0.47µH Output
10µF
PG
FB
EN
EN
GND
Rev 1.0
© 2015 Semtech Corporation