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ANPEC Introduce Dual Mobile-Friendly PWM Controller IC - APW7108

 2007-08-23

Announced by ANPEC, the APW7108 dual-channels PWM controller delivers high efficiency precision voltage regulation from two synchronous buck DC/DC converters. The output voltage range is 0.9V to 5.5V with 1% reference voltage accuracy. The APW7108 has wide input voltage range capability for voltage conversion directly from AC/DC adaptor or Li-Ion battery pack. The device is very suitable to provide power regulation for chipsets, graphics and other system electronics in Notebook PCs…etc.

The APW7108 integrates whole protections into a single package. The soft-start prevents the output voltage from overshoot as well as limiting the input inrush current. The output voltage will ramp down following the SOFT voltage when soft-stop is enable. The over current protection monitors the output current by using the voltage drop across the lower MOSFET’s RDS(ON) . Besides, it has under voltage and over voltage protections. Furthermore, APW7108 can select to operate in Forced PWM or automatic PFM/PWM mode. It provides application flexibility for customers.

It is available in SSOP-28 & 4x4QFN-24 packages and operates and operates over the -40°C to +85°C temperature range.

You can connect the ANPEC’s company website to know more information:http://www.anpec.com.tw/index.asp

APW7108 Feature:
•Adjustable Output Voltage up to 5.5V
   - 0.9V reference voltage
   - ±1% accuracy over termperature
•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 RDS(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 Available (RoHS Compliant)

Simplified Application Circuit