SC185
POWER MANAGEMENT
Features
4A Synchronous
Step-Down Regulator
Description
The SC185 is a 4A synchronous step-down regulator
designed to operate with an input voltage range of
2.9V to 5.5V. The device requires only three external
filter components for a complete a step down regulator
solution. The output voltage is factory predetermined
with an available range of 1.0V to 3.3V.
The SC185 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the SC185 operates in PWM mode with fixed 1.5MHz
oscillator frequency, allowing the use of small surface
mount external components. As the load decreases, the
regulator has the option to transition into Power Save
mode maintaining high efficiency or stay in forced PWM
mode operation.
The SC185 offers output short circuit and thermal
protection to safe guard the device under extreme
operating conditions. The enable pin provides on/off
control of the regulator. When connected to logic
low, the device enters shutdown and consumes less
than 1uA of current. Other protection features include
programmable soft start with Power Good indicator, over
voltage protection and under voltage lockout.
The SC185 is available in a thermally-enhanced, 3mm
x 3mm x 0.6mm MLPQ-UT16 package and has a rated
temperature range of -40 to +85°C.
V
IN
Range: 2.9 – 5.5V
V
OUT
Options: 1.0V to 3.3V
Up to 4A Output Current
Ultra-Small Footprint, <1mm Height Solution
1.5MHz Switching Frequency
Optional Power Save Mode Operation
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
100% Duty-Cycle Low Dropout Operation
<1µA Shutdown Current
Externally Programmable Soft Start Time
Power Good indicator
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
3mm x 3mm x 0.6mm thermally enhanced
MLPQ-UT16 package
-40 to +85°C Temperature Range
Pb-free, Halogen free, and RoHS/WEEE compliant
Fixed VOUT version
Applications
Desktop Computing
Set-Top Box
LCD TV
Network Cards
Printer
Typical Application Circuit
V
IN
C
IN
22µF
R
1
1
C
1
0.1µF
PGOOD
Enable
Mode
C
SS
7
6
5
9
1,2
PVIN
LX
14,15,16
L, 1.0µH
V
OUT
1.5V
C
OUT
47µF
SC185H
4
AVIN
VOUT
PGOOD
EN
MODE
SS
PGND
AGND
11,12,13,T
3
10
June 18, 2010
1
www.semtech.com
SEMTECH [ SEMTECH CORPORATION ]
