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SC2542 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC2542 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 27 page  1 www.semtech.com SC2542 High Performance Wide Input Range Dual Synchronous Buck Controller POWER MANAGEMENT Revision: August 24, 2005 Description Features Applications Typical Application Circuit Independent dual-switcher-outputs Integrated 5V standby output with over 50mA capability Wide input voltage range: 6.5V ~ 28V Adjustable output voltage down to 0.75V Light load efficiency enhancement Programmable skip mode operation Flexible power sequencing with enable and power good output Synchronous buck topology with voltage mode control Out of phase operation to reduce cost of input capacitor 10V internal regulator for gate driver to deliver high efficiency Programmable switching frequency: 100KHz ~ 300KHz Full protection: UVLO, OVP, and programmable OCP No need for current sense resistor Low standby operating current (200µA typical) Low shut down current (100nA typical) 28 lead TSSOP package with exposed die pad (EDP) Fully WEEE package and RoHS Compliant SC2542 is a high performance dual PWM controller. It is designed to convert a widely ranged battery rail down to two independent output rails. The PWM operation of the two channels are 180 degrees out of phase which can greatly reduce the size and the cost of the input capaci- tors. Synchronous buck PWM topology and voltage mode control allow fast transient response and flexible com- ponent selection for easy designs. A 5V standby regula- tor is integrated. A 10V internal linear regulator provides the bias for the controller, and this voltage is optimized for gate drivers to deliver high efficiency. The light load efficiency can be greatly improved by turn- ing off the low side MOSFET upon reversal of inductor current. There is no need for a current sensing resistor because the MOSFET on resistance is used as the sens- ing element. Under extreme light load conditions, the device will operate in a pulse skip mode. The switching frequency can be dropped significantly to a level pro- grammed by external resistors. The battery energy is bet- ter utilized with these efficiency enhancement schemes. The power sequencing is fully supported including inde- pendent start up and power good output. In shutdown mode the controller only draws 100nA from the supply. The controller also offers full protection features for the conditions of under voltage, over voltage, and over cur- rent. The switching frequency is adjustable from 100KHz to 300KHz. TSSOP-28-EDP package is offered. Notebook computer system power Systems with 6.5V ~ 28V input Network and telecom systems Other portable devices VCC FB2 STBY MODE FB1 FB1 VO1 ENABLE PWGRD VCC 5VSBY VO2 (5V/10A) VIN+ VIN+ VIN+ FB2 VO1 (3.3V/10A) TH-PAD SC2542 1 2 3 4 5 6 7 8 9 10 11 12 17 18 19 20 21 22 23 24 25 26 27 28 13 14 15 16 VIN VCC EN STBY FB1 ERROUT1 MINSET1 SS1 ILIM1 BST1 DRVH1 PHASE1 PHASE2 DRVH2 BST2 ILIM2 SS2 MINSET2 ERROUT2 FB2 PWRGD ROSC 5VSBY AGND DRVL1 PGND PVCC DRVL2 |
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