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SC411 Scheda tecnica(PDF) 1 Page - Semtech Corporation |
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SC411 Scheda tecnica(HTML) 1 Page - Semtech Corporation |
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1 / 27 page  www.semtech.com 1 POWER MANAGEMENT SC411 Synchronous Buck Pseudo-Fixed Frequency Power Supply Controller June 2007 The SC411 is a constant on-time synchronous buck PWM controller in a space-saving MLPQ package 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 SC411 based solu- tions will require less output capacitance than competing fixed frequency converters. The switching frequency is constant until a step-in load or line voltage occurs. During this 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, Powersave Mode enables the SC411 to skip PWM pulses for better efficiency. The output voltage can be adjusted from 0.5V to VCCA. A frequency setting resistor sets the on-time for the controller. 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, a Power Good output and soft discharge upon shutdown. 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 Powersave option Over-voltage/under-voltage fault protection 10μA typical shutdown current Low quiescent power dissipation Power good indicator 1.2% reference Integrated gate drivers with soft switching Enable pin 16 pin MLPQ (4mm x 4mm) Output soft discharge upon shutdown Notebook Computers CPU/IO Supplies Handheld Terminals and PDAs LCD Monitors Network Power Supplies Description Features Typical Application Circuit Applications C6 1uF R3 R6 VOUT C5 1nF R1 RTON1 VBAT PGOOD Q1 C7 1uF R5 C1 0.1uF D1 C2 10uF VBAT 5VSUS L1 + C4 VOUT R2 10R R4 5VSUS VOUT 1 VCCA 2 FB 3 PGD 4 VDDP 9 ILIM 10 LX 11 DH 12 U1 SC411 Q2 C3 |
Codice articolo simile - SC411 |
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Descrizione simile - SC411 |
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