SC186
4A Synchronous
Step-Down Regulator
POWER MANAGEMENT
Features
Description
Input Voltage Range — 2.9 to 5.5V
Output Voltage Range — 0.8V to 3.3V
Output Current — up to 4A
Ultra-Small Footprint — <1mm Height Solution
Switching Frequency — 1.5MHz
Automatic Power Save Mode
Efficiency Up to 95%
Low Output Noise Across Load Range
Excellent Transient Response
Start Up into Pre-Bias Output
Duty-Cycle Low Dropout Operation — 100%
Shutdown Current — <1µA
Externally Programmable Soft Start Time
Power Good indicator
Input Under-Voltage Lockout
Output Over-Voltage, Current Limit Protection
Over-Temperature Protection
Thermally Enhanced 3 x 3 x 0.6 (mm)
MLPQ-UT16 package
Temperature Range — -40 to +85°C
Lead-free, Halogen free, and RoHS/WEEE compliant
Applications
The SC186 is a 4A synchronous step-down regulator
designed to operate with an input voltage range of 2.9V
to 5.5V. The device offers fifteen pre-determined output
voltages via four control pins programmable from 0.8 to
3.3 Volts. The control pins allow for on-the-fly voltage
changes, enabling system designers to implement
dynamic power savings. The device is also capable of
adjusting output voltage via an external resistor divider.
The SC186 is optimized for maximum efficiency over a
wide range of load currents. During full load operation,
the device 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 will transition into Power Save mode maintaining high efficiency.
Connecting the control pins to logic low forces the device
into shutdown mode reducing the supply current to less
than 1μA. Connecting any of the control pins to logic high
enables the converter and sets the output voltage according to Table 1. Other features include under-voltage
lockout, programmable soft-start to limit in-rush current,
power good indicator, over-temperature protection, and
output short circuit protection.
The SC186 is available in a thermally-enhanced, 3 x 3 x 0.6
(mm) MLPQ-UT16 package.
Routers and Network Cards
LCD TV
Office Automation
Printers
Typical Application Circuit
V IN
LX
PVIN
C IN
22µF
R P GOOD
100kΩ
R A V IN
1Ω
C A V IN
0.1µF
L
1.0µH
SC186
AVIN
VOU T
SS
C T L0
PGOOD
C T L0
C T L1
C OU T
47µF
CSS
10nF
PGN D
C T L1
V OU T
AGN D
C T L2
C T L2
C T L3
C T L3
Revision 2.1
© 2016 Semtech Corporation
