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SC2441AEVB Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2441AEVB Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 37 page POWER MANAGEMENT 1 www.semtech.com SC2441A 1.8V to 20V Input 2-Phase Synchronous Step-down Controllers with Step-up Converter Description Revision: March 7, 2006 The SC2441A is a programmable frequency dual independent or dual/multiple phase single output peak current-mode step-down switching regulator controller. It is capable of operating from 1.8V to 20V input. A 0.6A step-up converter in the SC2441A generates an auxiliary gate drive supply when VIN is below 4.5V. This makes the SC2441A well suited for applications where a low-voltage input (<3.3V) is to be stepped down for lower voltage logic, yet the input is too low to drive power MOSFETs efficiently. The SC2441A employs a phase-locked synchronizing circuit that allows the step-up converter to operate at twice the switching frequency of the step-down controllers for miniaturization. The clock output signal enables two or more SC2441As to be daisy chained with programmable phase shift. Tying the FB2 pin to VIN makes the second step-down channel a slave of the first. Operating in this mode, the SC2441A regulates a single output with shared current in each channel. Each step-down controller has its own soft- start and overload shutdown timer for hiccup overload protection. In the single-output mode, the channel 1 timer controls the soft-start and overload hiccup of both controllers. Features Applications u Low voltage distributed DC-DC converters u Telecommunication power supplies u Servers and base stations 2-Phase Synchronous Step-down Controllers u 2-Phase Synchronous Continuous Conduction Mode u Out of Phase Operation for Low Input Current Ripple u Operates up to 1MHz Per Channel u Excellent Current Sharing Between Phases u Duty Cycle Up to 90% u 0.5V Feedback voltages for Low-Voltage Outputs u Starts into Pre-biased Outputs u Adaptive Shoot-through Protection u Lossless Inductor DCR Current Sensing u 23mV Current-limit Threshold u Individual Soft-start, Overload Hiccup and Enable Step-up Regulator u 0.27V V CESAT Switch at 0.6A u Fixed frequency Current-mode Control Common Features u Wide input Voltage Range: 1.8V to 20V u Synchronizing Frequency Equal to that of the Step- down Converters u 28-lead TSSOP-EDP Lead-free package, fully WEEE and RoHS compliant Typical Application Circuit Figure 1 R21 C3 Vin RCS+2 C21 R26 VCC R23 R2 VCC C8 D4 R11 U1 27 24 19 18 11 26 6 4 28 12 3 5 17 13 14 8 15 16 2 7 25 23 22 20 21 10 9 1 SW3 PGND1 GDH2 BST2 FB1 PGND2 SYNC/SHDN CS1+ CKOUT COMP1 SS1/EN1 CS1- SS2/EN2 COMP2 FB2 COMP3 CS2- CS2+ PLLF FB3 BST1 GDH1 GDL1 GDL2 VCC ROSC GND IN R15 R16 R19 VOUT1 R1 C22 L2 R8 VCC Signal Ground C24 R9 R24 C26 R13 Power Ground R4 L3 C25 Q3 C6 Q2 R10 R18 L1 C5 C20 C7 R20 R25 R12 D1 C19 C23 D2 C13 D3 Q4 R7 R3 C11 D5 VOUT2 Vin C4 C2 C1 R27 RCS+1 R6 R5 C9 Q1 C12 SC2441A |
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