SC2440ATETRT Semtech

SC2440A Dual 30V Step-Down Switching Regulator with 2A Switches POWER MANAGEMENT Features Description Wide Input Voltage Range: 2.8V to 30V The SC2440A is a constant frequency dual current-mode Two Integrated 2A Switches step-down regulator with integrated 30V switches. It pro- Up to 2.5MHz per Channel Programmable Constant duces two independent outputs from a common input Switching Frequency power supply. Channel switching frequency can be pro- Out of Phase Switching Reduces Input Ripple grammed up to 2.5MHz. The two regulators switch in Both Switching Regulators share a single Input Filter- opposite phase, reducing input ripple current. As a result, ing Capacitor, Reducing Cost a smaller input filtering capacitor can be used. External Synchronization Cycle-by-Cycle Current-limiting Current-mode PWM control simplifies loop compensa- Independent Soft-Start/Enable Pins tion. Cycle-by-cycle current limiting and hiccup overload Independent Hiccup Overload Protection protection reduce power dissipation during overload. The Power Good Indicators Ease Output Sequencing SC2440A is output short-circuit robust. Low Shutdown Current Thermally Enhanced 6-pin TSSOP Lead Free Pack- Separate soft-start/enable pins allow independent con- age trol of each channel. Output power good indicators ease Fully WEEE and RoHS Compliant output sequencing. The SC2440A can be synchronized to an external clock. This eases noise filtering by eliminating Applications beat frequencies and confining switching noise to a nar- row band. XDSL and Cable Modems Point of Load Applications Security Cameras Typical Application Circuit R 6 100k F B 1 P G O O D 1 C 5 D 3 R 5 B S T 1 C O M P 1 9.31k 1N 4148 680pF C 2 0.1 F C 7 L1 O UT 1 S S 1 SW 1 3.3 H 3.3V /1.8A 22nF R 1 23.3k D 1 V IN C 1 U P S 120 S Y N C 12V 10% 10 F R 2 C 15 10k R 9 R O S C IN 13.3k 4.7 F S C 2440A C 10 S S 2 D 2 22nF U P S 120 C 8 R 7 C O M P 2 L2 O UT 2 14.0k 470pF SW 2 4.4 H 5V /1.8A C 4 R 3 40.2k 0.1 F D 4 C 3 G N D B S T 2 10 F 1N 4148 R 4 F B 2 P G O O D 2 10k R 8 100k L1: Sum ida C R 43 C 1, C 3: M urata G R M 21BR 60J106 K L2: F alco D 04012 C 15: M urata G R M 21BR 6 1E475 K Figure 1. 1.3MHz 12V to 5V and 3.3V Step-down Converter C 6 C 9 10pF 10pF Revision 2.4 20 4 Semtech Corporation F ree-running frequency = 957kH z (R ev1 trim m ed part, R 9 = 18.7k) C 16 0.1 F 1.1M H zSC2440A Pin Configuration Ordering Information Device Package ( ) (2) SC2440ATETRT TSSOP- 6 EDP Top View SC2440AEVB Evaluation Board Notes: B S T1 1 16 FB 1 ( ) Available in tape and reel only. A reel contains 2,500 devices. SW 1 2 15 C O M P 1 (2) Available in lead-free package only. Device is WEEE and RoHS compliant. 3 IN 14 P G O O D 1 S Y N C 4 17 13 S S 1 G N D R O S C 5 12 S S 2 IN 6 11 P G O O D 2 SW 2 10 C O M P 2 7 B S T2 8 FB 2 9 = 40C/W JA 16 Pin TSSOP-EDP Marking Information yyww - Date Code xxxxx xxxxx - Semtech Lot Number 2