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Semtech SC284

Dual Channel 2.5MHz, 1.8A Synchronous Step-Down Regulator

Overview

TopologyOther Topology
IC revision1.0

Description

SC284QEVBThe SC284 is a dual channel 1.8A synchronous stepdownregulator designed to operate with an inputvoltage range of 2.9 to 5.5 Volts. Each channel offersfifteen pre-determined output voltages via four controlpins programmable from 0.8 to 3.3 Volts. The control pinsallow for on-the-fly voltage changes, enabling systemdesigners to implement dynamic power savings. TheSC284 is also capable of adjusting the output voltage viaan external resistor divider.The device operates with a fixed 2.5MHz oscillatorfrequency, allowing the use of small surface mountexternal components.Connecting CTL0 — CTL3 to logic low forces the deviceinto shutdown mode reducing the supply current to lessthan 1μA. Connecting any of the control pins to logichigh enables the converter and sets the output voltageaccording to Table 1. Other features include undervoltagelockout, soft-start to limit inrush current, andover-temperature protection.The SC284 is available in a 3 x 3 x 0.6 (mm) MLPQ-UT20package and has a rated temperature range of -40 to+85°C.

Features

VIN Range — 2.9 – 5.5VVOUT Selectable — 0.8 - 3.3VUp to 1.8A Output Current for Each ChannelUltra-Small Footprint, <1mm Height SolutionSwitching Frequency — 2.5MHzEfficiency Up to 94%Excellent Light Load EfficiencyLow Output Noise Across Load RangeExcellent Transient ResponseStart Up into Pre-Bias Output100% Duty-Cycle Low Dropout OperationShutdown Current — <1μAInternal Soft StartInput Under-Voltage LockoutOutput Over-Voltage, Current Limit ProtectionOver-Temperature ProtectionAdjustable Output VoltagePackage — 3 x 3 x 0.6(mm) UT20Temperature Range — -40 to +85°CLead-free, halogen-free, and RoHS/WEEE compliant

Typical applications

  • Printer
  • LCD TV
  • Network Cards
  • Desktop Computing
  • Set-Top Box

Products

Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Mount Samples
74437321022
STE ALT EAG CAD LTS PSP SPE IGS CADWE-LHMI SMT Power Inductor 2.2 2.5 4.2 69.2 80 55 SMT
Order Code Data­sheet
74437321022
Samples
Order Code Data­sheet Downloads Product seriesL
(µH)
IR
(A)
ISAT
(A)
RDC typ.
(mΩ)
RDC max.
(mΩ)
fres
(MHz)
Mount Samples