SC185 Datasheet, PDF (1/18 Pages) Semtech Corporation – 4A Synchronous Step-Down Regulator

SC185
4A Synchronous
POWER MANAGEMENT
Features
Step-Down Regulator
Description
 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
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.
 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
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.
 Power Good indicator
 Input Under-Voltage Lockout
The SC185 offers output short circuit and thermal
protection to safe guard the device under extreme
 Output Over-Voltage, Current Limit Protection
operating conditions. The enable pin provides on/off
Fixed VOUT version ^{ Over-Temperature Protection}
control of the regulator. When connected to logic
 3mm x 3mm x 0.6mm thermally enhanced
low, the device enters shutdown and consumes less
MLPQ-UT16 package
than 1uA of current. Other protection features include
programmable soft start with Power Good indicator, over
 -40 to +85°C Temperature Range
voltage protection and under voltage lockout.
 Pb-free, Halogen free, and RoHS/WEEE compliant
Applications
 Desktop Computing
 Set-Top Box
 LCD TV
 Network Cards
 Printer
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.
Typical Application Circuit
V_IN
C_IN
22µF
PGOOD
Enable
Mode
1,2 _PVIN
L, 1.0µH
LX ^14,15,16
R₁
1
C₁
0.1µF
C_SS
SC185H
4 _AVIN
VOUT ¹⁰
7 _PGOOD
6 _EN
5 _MODE
9 _SS
11,12,13,T
PGND
3
AGND
C_OUT
47µF
V_OUT
1.5V
June 18, 2010

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