SC283 Datasheet, PDF (1/20 Pages) Semtech Corporation – Dual Channel 2.5MHz, 1.8A Synchronous Step-Down Regulator

SC283
Dual Channel 2.5MHz, 1.8A
POWER MANAGEMENT
Features
Synchronous Step-Down Regulator
Description
 V_IN Range: 2.9 – 5.5V
 V_OUT Selectable: 0.8 - 3.3V
 Up to 1.8A Output Current for Each Channel
 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
 2mm x 3mm x 0.8mm thermally enhanced
MLPQ-W18 package
 -40 to +85°C Temperature Range
 Pb-Free product. RoHS/WEEE and Halogen Free com-
pliant
Applications
The SC283 is a dual channel 1.8A synchronous step-
down regulator designed to operate with an input
voltage range of 2.9 to 5.5 Volts. Each channel 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
SC283 is also capable of adjusting the output voltage via
an external resistor divider.
The device operates with a fixed 2.5MHz oscillator
frequency, 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 inrush current, and
over-temperature protection.
The SC283 is available in a thermally-enhanced, 2mm
x 3mm x 0.8mm MLPQ-W18 package and has a rated
temperature range of -40 to +85°C.
 Desktop Computing
 Set-Top Box
 LCD TV
 Network Cards
 Printer
Typical Application Circuit
July 20, 2010

www.semtech.com