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APW7108 Datasheet(PDF) 1 Page - Anpec Electronics Coropration |
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APW7108 Datasheet(HTML) 1 Page - Anpec Electronics Coropration |
1 / 28 page Copyright © ANPEC Electronics Corp. Rev. A.4 - Jan., 2009 APW7108 www.anpec.com.tw 1 ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and advise customers to obtain the latest version of relevant information to verify before placing orders. Dual Mobile-Friendly PWM Controller The APW7108 is a dual-channel, constant on-time, and synchronous PWM controller which drives dual N- channel MOSFETs for each channel. The APW7108 steps down high voltage of a battery to generate low-voltage chipset or RAM supplies in notebook computers. The APW7108 provides excellent transient response and accurate DC voltage output in either PFM or PWM mode. In PFM mode, the APW7108 provides very high efficiency over light to heavy loads with loading-modu- lated switching frequencies. The Forced-PWM mode works nearly at constant frequency for low-noise requirements. The APW7108 is equipped with accurate current-limit, output under-voltag, and output over-voltage protections, perfect for NB applications. A Power-On-Reset function monitors the voltage on V CC to prevent wrong opera- tion during power on. A soft-start ramps up the output voltage with programmable slew rate to reduce the start-up current. A soft-stop function actively discharges the output capacitors with controlled reverse inductor current. At the end of the soft-stop, the APW7108 forces LGATE high to prevent over-voltage in shutdown. The APW7108 has individual enable controls for each channel. Pulling both EN pin low shuts down the whole chip with low quiescent current close to zero. The APW7108 is available in SSOP-28 and QFN4x4-24 packages. Features General Description • Adjustable Output Voltage up to 5.5V - 0.9V Reference Voltage - ±1% Accuracy Over Temperature • Operates from an Input Battery Voltage Range of 5V to 24V or from 3.3V/5V System Rail • Power-On-Reset Monitoring on VCC Pin • Selectable Forced PWM or Automatic PFM/PWM Mode • Constant-On-Time Control Scheme - Switching Frequency Compensation for PWM Mode - Constant Switching Frequency (CH1: 345kHz, CH2: 255KHz) in PWM Mode with DC Output Current • Excellent Line and Load Transient Responses • Adjustable Soft-Start and Soft-Stop • Power-Good Outputs for both Channels • Adjustable Current-Limit Protection - Using Sense Resistor or MOSFET’s R DS(ON) • 115% Over-Voltage Protection - No Negative Output Voltage Occurred • 70% Under-Voltage Protection • Adaptive Dead-Time Control - Sensing G-to-S Voltage of Power MOSFETs • Shutdown Control for both Channels • 28-pin SSOP (SSOP-28) and 4mmx4mm 24-lead QFN (QFN4x4-24) Packages • Lead Free and Green Devices Available (RoHS Compliant) Applications • Note Book Computers - Chipset/RAM Supplies as low as 0.9V - 1.8V and 2.5V Supplies • Step-Down Converters Requiring High Efficiency Simplified Application Circuit V OUT2 Q3 PWM2 Q4 V OUT1 V IN +5V~24V PWM1 V CC=5V Q1 Q2 EN1 EN2 R OCSET1 R OCSET2 SSOP-28 |
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