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SC1485ITSTR Datasheet(PDF) 1 Page - Semtech Corporation |
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SC1485ITSTR Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 27 page  www.semtech.com 1 POWER MANAGEMENT SC1485 Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller Description Revision: April 26, 2005 The SC1485 is a dual output constant-on synchronous buck PWM controller intended for use in notebook computers and other battery operated portable devices. Features include high efficiency and a fast dynamic response with no minimum on time. The excellent transient response means that SC1485 based solutions will require less output capacitance than competing fixed frequency converters. The switching frequency is constant until a step in load or line voltage occurs at which time the pulse density and frequency will increase or decrease to counter the change in output or input voltage. After the transient event, the controller frequency will return to steady state operation. At light loads, Power-Save Mode enables the SC1485 to skip PWM pulses for better efficiency. Each output voltage can be independently adjusted from 0.5V to VCCA. Two frequency setting resistors set the on-time for each buck controller. The frequency can thus be tailored to minimize crosstalk. The integrated gate drivers feature adaptive shoot-through protection and soft switching. Additional features include cycle-by-cycle current limit, digital soft-start, over-voltage and under- voltage protection, and a PGOOD output for each controller. Constant on-time for fast dynamic response Programmable VOUT range = 0.5 – VCCA VBAT Range = 1.8V – 25V DC current sense using low-side RDS(ON) sensing or sense resistor Resistor programmable frequency Cycle-by-cycle current limit Digital soft-start Separate PSAVE option for each switcher Over-voltage/Under-voltage fault protection 10µA typical shutdown current Low quiescent power dissipation Two Power Good indicators 1% Reference (2% system DC accuracy) Integrated gate drivers with soft switching Separate enables 28 Lead TSSOP Industrial temperature range Notebook computers CPU I/O supplies Handheld terminals and PDAs LCD monitors Network power supplies Features C6 1uF R7 R3 VOUT1 C5 1nF R1 RTON1 VBAT PGOOD Q2 Q1 C4 1uF R4 D1 C1 0.1uF C2 10uF 5VSUS VBAT L1 + C3 VOUT1 R2 10R R5 Q4 R14 Q3 C7 0.1uF + C9 C12 1uF C11 1nF PGOOD VBAT L2 R11 R12 D2 5VSUS C8 10uF R8 RTON2 C10 1uF R10 R9 10R VOUT2 VOUT2 R6 0R R13 0R 5VSUS 5VSUS VBAT EN/PSV1 22 TON1 23 VOUT1 24 VCCA1 25 FB1 26 PGD1 27 VSSA1 28 PGND1 1 DL1 2 VDDP1 3 ILIM1 4 LX1 5 DH1 6 BST1 7 EN/PSV2 8 TON2 9 VOUT2 10 VCCA2 11 FB2 12 PGD2 13 VSSA2 14 PGND2 15 DL2 16 VDDP2 17 ILIM2 18 LX2 19 DH2 20 BST2 21 U1 SC1485 VSSA2 VSSA2 VSSA1 VSSA1 Applications |
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