APW7098 Datasheet, PDF (1/30 Pages) Anpec Electronics Coropration – Two- Phase Buck PWM Controller with Integrated MOSFET Drivers

APW7098
Two- Phase Buck PWM Controller with Integrated MOSFET Drivers
Features
General Description
• Voltage-Mode Operation with Current Sharing
- Adjustable Feedback Compensation
- Fast Load Transient Response
• Operate with 8V~13.2V_CC Supply Voltage
• Selectable External or Internal 0.6V Reference
- ±1.5% Accuracy Over Temperature
• Support Single- and Two-Phase Operations
• 5VCC and Buffered Reference Outputs
• 8~12V Gate Drivers with Internal Bootstrap
Diode
• Lossless Inductor DCR Current Sensing
• Selectable Operation Frequency
- 150k/300k/400kHz per Phase
• Power-OK Indicator Output
- Regulated 1.5V on REFOUT/POK
• Adjustable Over-Current Protection (OCP)
• Accurate Load Line (DROOP) Programming
• Adjustable Soft-Start
• Over-Voltage Protection (OVP)
• Under-Voltage Protection (UVP)
• Over-Temperature Protection (OTP)
• QFN4x4 24-Lead Package (QFN4x4-24A)
• Lead Free and Green Devices Available
(RoHS Compliant)
Simplified Application Circuit
V_IN1
REFIN/EN
REFOUT/POK
APW7098 ^V_IN2
COMP
FB
V_OUT
The APW7098, two-phase PWM control IC, provides a
precision voltage regulation system for advanced graphic
microprocessors in graphics card applications. The
integration of power MOSFET drivers into the controller
IC and reduces the number of external parts for a cost
and space saving power management solution.
The APW7098 uses a voltage-mode PWM architecture,
operating with fixed-frequency, to provides excellent load
transient response. The device uses the voltage across
the DCRs of the inductors for current sensing. Load line
voltage positioning (DROOP), channel-current balance,
and over-current protection are accomplished through
continuous inductor DCR current sensing.
The MODE pin programs single- or two- phase operation.
When IC operates in two-phase mode normally, it can
transfer two-phase mode to single-phase mode at liberty.
Nevertheless, once operates in single-phase mode, the
operation mode is latched. It is required to toggle SS,
REFIN/EN or 5VCC pin to reset the IC. Such feature of the
MODE pin makes the APW7098 ideally suitable for dual
power input applications, such as PCIE interfaced graphic
cards.
This control IC‘s protection features include a set of
sophisticated over-temperature, over-voltage, under-
voltage, and over-current protections. Over-voltage re-
sults in the converter turning the lower MOSFETs on to
clamp the rising output voltage and protects the
microprocessor. The over-current protection level is set
through external resistors. The device also provides a
power-on-reset function and a programmable soft-start
to prevent wrong operation and limit the input surge
current during power-on or start-up.
The APW7098 is available in a QFN4x4-24A package.
Applications
• Graphics Card GPU Core Power Supply
• Motherboard Chipset or DDR SDRAM Core Power
Supply
• On-board High Power PWM Converter with Out-
put Current up to 60A
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.
Copyright © ANPEC Electronics Corp.
1
Rev. A.6 - Oct., 2009
www.anpec.com.tw