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SC2440ATETRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2440ATETRT Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 28 page  POWER MANAGEMENT Dual 30V Step-Down Switching Regulator with 2A Switches Typical Application Circuit Revision 2.4 Applications XDSL and Cable Modems Point of Load Applications Security Cameras 1.3MHz 12V to 5V and 3.3V Step-down Converter Figure 1. C9 10pF C6 10pF 1.1M Hz C16 0.1µF Free-running frequency = 957kHz (Rev1 trimmed part, R9 = 18.7k) C15 40.2k SC2440A G ND SS2 IN SW 1 FB2 RO SC CO M P2 R7 14.0k BST1 BST2 SW 2 L1 C2 0.1µF L2 PG OO D2 SS1 PG OO D1 CO M P1 FB1 C3 D1 UPS120 D2 UPS120 100k R9 13.3k O UT1 3.3V/1.8A 10k R4 R3 10k R2 R1 23.3k C7 22nF C10 22nF C8 470pF R5 9.31k C5 680pF D4 1N4148 SYNC L2: Falco D04012 L1: Sumida C R43 O UT2 5V/1.8A D3 1N4148 VIN 12V ± 10% C4 0.1µF 10µF 4.7µF C1 10µF 3.3µH 4.4µH R8 C1, C3: Murata G RM21BR60J106K C15: Murata G RM21BR61E475K 100k R6 © 204 Semtech Corporation SC2440A Features Wide Input Voltage Range: 2.8V to 30V Two Integrated 2A Switches Up to 2.5MHz per Channel Programmable Constant Switching Frequency Out of Phase Switching Reduces Input Ripple Both Switching Regulators share a single Input Filter- ing Capacitor, Reducing Cost External Synchronization Cycle-by-Cycle Current-limiting Independent Soft-Start/Enable Pins Independent Hiccup Overload Protection Power Good Indicators Ease Output Sequencing Low Shutdown Current Thermally Enhanced 6-pin TSSOP Lead Free Pack- age Fully WEEE and RoHS Compliant Description The SC2440A is a constant frequency dual current-mode step-down regulator with integrated 30V switches. It pro- duces two independent outputs from a common input power supply. Channel switching frequency can be pro- grammed up to 2.5MHz. The two regulators switch in opposite phase, reducing input ripple current. As a result, a smaller input filtering capacitor can be used. Current-mode PWM control simplifies loop compensa- tion. Cycle-by-cycle current limiting and hiccup overload protection reduce power dissipation during overload. The SC2440A is output short-circuit robust. Separate soft-start/enable pins allow independent con- trol of each channel. Output power good indicators ease output sequencing. The SC2440A can be synchronized to an external clock. This eases noise filtering by eliminating beat frequencies and confining switching noise to a nar- row band. |
Similar Part No. - SC2440ATETRT |
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Similar Description - SC2440ATETRT |
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