SC183C Datasheet, PDF (1/20 Pages) Semtech Corporation – 2.5MHz, 2A Synchronous Step-Down Regulator

POWER MANAGEMENT
Features
 V_IN Range: 2.9 – 5.5V
 V_OUT Options: 0.8 - 3.3V
 Up to 2A Output Current
 Ultra-Small Footprint, <1mm Height Solution
 2.5MHz Switching Frequency
 Efficiency Up to 93%
 Low Output Noise Across Load Range
 Excellent Transient Response
 Start Up into Pre-Bias Output
 100% Duty-Cycle Low Dropout Operation
 <1µA Shutdown Current
 Internal Soft Start
 Input Under-Voltage Lockout
 Output Over-Voltage, Current Limit Protection
 Over-Temperature Protection
 Adjustable Output Voltage
 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
Applications
 Office Automation and Computing
 Set-Top Box
 LCD TV
 Network Cards
 Printer
SC183C
2.5MHz, 2A Synchronous
Step-Down Regulator
Description
The SC183C is a 2A synchronous step-down regulator
designed to operate with an input voltage range of 2.9 to
5.5 Volts. The device offers fifteen pre-determined outputs
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 SC183C is also capable of
adjusting output voltage via an external resistor divider.
The device operates with a fixed 2.5MHz oscillator fre-
quency, allowing the use of small surface mount external
components.
Connecting CTL0 — CTL3 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, soft-start to limit in-rush current, and
over-temperature protection.
The SC183C is available in a thermally-enhanced, 3mm x
3mm x 0.6mm MLPQ-UT16 package and has a rated tem-
perature range of -40 to +85°C.
Typical Application Circuit
V_IN
CTL0
CTL1
CTL2
CTL3
C_IN
10µF
R_AVIN
10
C_AVIN
1µF
PVIN
LX
SC183C
AVIN
VOUT
CTL0
CTL1
CTL2
CTL3
PGND
AGND
L
1.0µH
C_OUT
22µF
V_OUT
1.50V / 2.0A
July 28, 2010