APW7088
Two-Phase Buck PWM Controller with Integrated MOSFET Drivers
Features
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Voltage-Mode Operation with Current Sharing
- Adjustable Feedback Compensation
- Fast Load Transient Response
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Operate with 8V~13.2V
CC
Supply Voltage
Programmable 3-Bit DAC Reference
-±1.5% System Accuracy Over Temperature
Support Single- and Two-Phase Operations
5V Linear Regulator Output on 5VCC
8~12V Gate Drivers with Internal Bootstrap Diode
Lossless Inductor DCR Current Sensing
Fixed 300kHz Operating Frequency Per Phase
Power-OK Indicator Output
- Regulated 1.5V on 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 (QFN4x4-24)
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW7088, two-phase PWM control IC, provides a
precision voltage regulation system for advanced graphic
microprocessors in graphics card applications. The inte-
gration of power MOSFET drivers into the controller IC
reduces the number of external parts for a cost and space
saving power management solution.
The APW7088 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 or
5VCC pin to reset the IC. Such feature of the MODE pin
makes the APW7088 ideally suitable for dual power input
applications, such as PCIE interfaced graphic cards.
This control IC‘ protection features include a set of so-
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phisticated over temperature, over-voltage, under-voltage,
and over-current protections. Over-voltage results 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 func-
tion and a programmable soft-start to prevent wrong op-
eration and limit the input surge current during power-on
or start-up.
V
OUT
Simplified Application Circuit
V
IN1
VID0
VID1
VID2
APW7088
POK
The APW7088 is available in a QFN4x4-24 package.
V
IN2
COMP
FB
Applications
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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.
Rev. A.4 - Feb., 2009
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
