APW7060
Dual Controllers - Step Down Synchronous PWM and Linear Controller
Features
•
Provides Two Regulated Voltages
- One Synchronous DC/DC Buck Controller
- One Linear Controller
General Description
The APW7060 integrates a synchronous buck PWM
controller and a linear controller to provide two regu-
lated voltages in a single package. The PWM control-
ler drives external N-channel MOSFETs and operates
at a fixed 600kHz frequency. When the input supply
drops close to the output, the upper MOSFET remains
on, achieving 100% duty cycle. Internal loop compen-
sation is optimized for fast transient response, elimi-
nating external compensation network. The linear con-
troller drives an external N-channel MOSFET to form a
linear regulator. The internal 0.8V reference makes this
part suitable for a wide variety of low voltage
applications.
The APW7060 has an undervoltage lockout circuitry
to ensures that both the 5VCC and 12VCC must be
present before its internal circuitry is power up. Soft
start is internally set to 2ms and will bring both out-
puts into regulation in a controlled manner. When ei-
ther output goes into short, soft start will be initiated.
If the short condition still remains after three cycles,
both regulators will be shut down. To restart both
regulators, recycle the voltage at 5VCC or 12VCC pin
or momentarily pull the FB2 pin above 1.28V.
The APW7060 can be shutdown by pulling the FB2
pin above 1.28V. In shutdown, all gate drive signals
will be low. This dual controller is available in SO-14
package.
•
0.8V Internal Reference Voltage
- Both Controllers: 0.8V ± 2% Line, Load
and Temp.
•
Output Voltage Range
- PWM Controller : 0.8V to V
IN
- Linear Controller : 0.8V to (12VCC-V
GSpass
)
•
Full Duty Cycle Range for PWM Controller
- 0% to 100%
•
Internal Loop Compensation for PWM Controller
•
Internal 2ms Soft Start and Short Circuit Protec
tion for both Controllers
•
Both Controllers Drive N-Channel MOSFETs
•
Small Converter Size
- 600kHz Constant Switching Frequency
- Simple SO-14 Package
•
Shutdown Control
Applications
•
•
•
•
•
Motherboard
Graphics Cards
12V, 5V and 3.3V Inputs DC-DC Converter
DSP Supplies
Embedded processor and I/O supplies
Pinouts
LGATE
GND
GND
5VCC
DRIVE2
FB2
NC
1
2
3
4
5
6
7
14
13
12
11
10
9
8
UGATE
12VCC
NC
NC
NC
FB
NC
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.3 - Oct., 2003
1
www.anpec.com.tw
ANPEC [ ANPEC ELECTRONICS COROPRATION ]
