APW8722/A/B/C/D
5V to 12V Single Buck Voltage Mode PWM Controller
Features
•
•
•
Wide 5V to 12V Supply Voltage
Power-On-Reset Monitoring on VCC
Excellent Output Voltage Regulations
- 0.6V Internal Reference for APW8722/A/D
- 0.8V Internal Reference for APW8722B/C
- ±0.6% Over-Temperature Range
General Description
The APW8722 is a voltage mode, fixed 200kHz/300kHz/
600kHz switching frequency, synchronous buck converter.
The APW8722 allows wide input voltage that is either a
single 5~12V or two supply voltage(s) for various
applications. A power-on-reset (POR) circuit monitors the
VCC supply voltage to prevent wrong logic controls. A built-
in soft-start circuit prevents the output voltages from over-
shoot as well as limits the input current. An internal 0.6V
temperature-compensated reference voltage with high
accuracy is designed to meet the requirement of low out-
put voltage applications. The APW8722 provides excel-
lent output voltage regulations against load current
variation.
The controller’ over-current protection monitors the out-
s
put current by using the voltage drop across the RDS
(ON) of low-side MOSFET, eliminating the need for a cur-
rent sensing resistor that features high efficiency and
low cost. In addition, the APW8722 also integrates excel-
lent protection functions. The over-voltage protection (OVP)
, under-voltage protection (UVP). OVP circuit which moni-
tors the FB voltage to prevent the PWM output from over
voltage, and UVP circuit which monitors the FB voltage to
prevent the PWM output from under voltage or short circuit.
The APW8722 is available in SOP-8P packages
•
•
•
•
Integrated Soft-Start
Voltage Mode PWM Operation with External
Compensation
Up to 90% Duty Ratio for Fast Transient Response
Constant Switching Frequency
- 300kHz ±10% for APW8722/B
- 200kHz ±10% for APW8722C
- 600kHz ±10% for APW8722A/D
•
•
•
•
•
•
•
Integrated Bootstrap Forward P-CH MOSFET
50% Under-Voltage Protection
125% Over-Voltage Protection
Adjustable Over-Current Protection Threshold
- Using the R
DS(ON)
of Low-Side MOSFET
Shutdown Control by COMP
SOP-8P Package
Lead Free and Green Devices Available
(RoHS Compliant)
Applications
•
•
•
•
•
•
Graphic Cards
DSL, Switch HUB
Wireless Lan
Notebook Computer
Mother Board
LCD Monitor/TV
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 - Jun., 2013
1
www.anpec.com.tw
APW8722/A/B/C/D
Simplified Application Circuit
V
VCC
V
IN
5
7
OFF
ON
VCC
COMP
BOOT
UGATE
1
2
V
OUT
APW8722
PHASE
8
LGATE
6
FB
GND
3
4
Ordering and Marking Information
APW8722/A/B/C/D
Assembly Material
Handling Code
Temperature Range
Package Code
Package Code
KA : SOP-8P
Operating Ambient Temperature Range
I : -40 to 85
o
C
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
APW8722/A/B/C/D
KA :
APW8722X
XXXXX
X
–
A/B/C/D
XXXXX - Date Code
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020D for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS compliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).
Pin Configuration
APW8722/B/C/D
BOOT 1
UGATE 2
GND 3
LGATE/OCSET 4
8
7
6
5
PHASE
COMP
FB
VCC
BOOT 1
UGATE 2
OCSET 3
LGATE 4
APW8722A
8
7
6
5
PHASE
COMP
FB
VCC
9 GND
9 GND
SOP-8P
(top view)
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jun., 2013
2
SOP-8P
(top view)
www.anpec.com.tw
APW8722/A/B/C/D
Absolute Maximum Ratings
(Note 1)
Symbol
V
VCC
V
BOOT
Parameter
VCC Supply Voltage (VCC to GND)
BOOT Supply Voltage (BOOT to PHASE)
BOOT Supply Voltage (BOOT to GND)
UGATE Voltage (UGATE to PHASE)
> 20ns
< 20ns
LGATE Voltage (LGATE to GND)
> 20ns
< 20ns
PHASE Voltage (PHASE to GND)
FB ,COMP to GND
POK to GND
T
J
T
STG
T
SDR
Maximum Junction Temperature
Storage Temperature
Maximum Lead Soldering Temperature, 10 Seconds
> 20ns
< 20ns
Rating
-0.3 ~ 16
-0.3 ~ 16
-0.3 ~ 32
-0.3 ~ V
BOOT
+0.3
-5 ~ V
BOOT
+5
-0.3 ~ V
VCC
+0.3
-5 ~ V
VCC
+5
-0.3 ~ 16
-5 ~ 25
-0.3 ~ 7
-0.3~V
CC
+0.3
150
-65 ~ 150
260
Unit
V
V
V
V
V
V
V
V
V
V
V
°C
°C
°C
V
UGATE
V
LGATE
V
PHASE
Note1: Stresses beyond those listed under "absolute maximum ratings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under "recom-
mended operating conditions" is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device
reliability.
Thermal Characteristics
Symbol
θ
JA
Parameter
Thermal Resistance -Junction to Ambient
(Note 2)
SOP-8P
60
Typical Value
Unit
°C/W
Note 2:
θ
JA
is measured with the component mounted on a high effective thermal conductivity test board in free air.
Recommended Operating Conditions
(Note 3)
Symbol
V
VCC
V
OUT
V
IN
I
OUT
T
A
T
J
Parameter
VCC Supply Voltage (VCC to GND)
Converter Output Voltage for APW8722/A/D
Converter Output Voltage for APW8722B/C
Converter Input Voltage
Converter Output Current
Ambient Temperature
Junction Temperature
Range
4.5 ~ 13.2
0.6 ~ 5
0.8 ~ 5
3~13.2
0 ~ 25
-40 ~ 85
-40 ~ 125
Unit
V
V
V
V
A
°C
°C
Note 3: Refer to the application circuit for further information.
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jun., 2013
3
www.anpec.com.tw
APW8722/A/B/C/D
Electrical Characteristics
Refer to the typical application circuit. These specifications apply over V
VCC
= 12V, T
A
= -40°C to 85°C, unless otherwise
noted. Typical values are at T
A
= 25°C.
Symbol
Parameter
Test Conditions
Min.
INPUT SUPPLY VOLTAGE AND CURRENT
I
VCC
VCC Supply Current (Shutdown Mode)
VCC Supply Current
POWER-ON-RESET(POR)
Rising VCC POR Threshold
VCC POR Hysteresis
OSCILLATOR
For APW8722/B
F
OSC
∆V
OSC
D
MAX
Oscillator Frequency
For APW8722C
For APW8722A/D
Oscillator Sawtooth Amplitude
(Note 4)
Maximum Duty Cycle
(1.2V~2.7V typical)
270
180
540
-
-
300
200
600
1.5
-
330
220
660
-
90
V
%
kHz
3.8
0.3
4.1
0.5
4.4
0.6
V
V
UGATE and LGATE open;
COMP=GND
UGATE and LGATE open
-
-
-
2.5
550
10
µA
mA
APW8722
Typ.
Max.
Unit
REFERENCE
APW8722/A/D Reference Voltage
V
REF
APW8722B/C Reference Voltage
T
A
= -40 ~ 85°C
T
A
= -40 ~ 85°C
0.596
0.795
0.6
0.8
0.604
0.805
V
ERROR AMPLIFIER
Open-Loop GAIN
(Note 4)
Open-Loop Bandwidth
(Note 4)
FB Input Leakage Current
GATE DRIVERS
High-side Gate Driver Source Current
High-side Gate Driver Sink Current
Low-side Gate Driver Source Current
Low-side Gate Driver Sink Current
T
D
Dead-time (Note 4)
V
BOOT
= 12V, V
UGATE-PHASE
= 6V
V
BOOT
= 12V, V
UGATE-PHASE
= 6V
V
VCC
= 12V, V
LGATE-GND
= 6V
V
VCC
= 12V, V
LGATE-GND
= 6V
-
-
-
-
-
1.0
1.1
1.8
2.0
30
-
-
-
-
-
ns
A
R
L
= 10kΩ, C
L
= 10pF
R
L
= 10kΩ, C
L
= 10pF
V
FB
= 0.6V
-
-
-
90
20
-
-
-
0.1
dB
MHz
µA
PROTECTIONS
V
FB_UV
FB Under-Voltage Protection Trip Point
Under-Voltage Debounce Interval
Under-Voltage Protection Enable
Delay
V
FB_OV
FB Over-Voltage Protection Rising
Threshold
FB Over-Voltage Protection Falling
Threshold
Over-Voltage Debounce Interval
V
OCP_MAX
I
OCSET
Built-in Maximum OCP Voltage
OCSET Current Source
V
FB
rising
V
FB
falling
Percentage of V
REF
45
-
-
120
100
-
-
9
50
2
1.5
125
105
2
1200
10
55
-
-
130
110
-
-
11
%
µs
ms
%
%
µs
mV
µA
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jun., 2013
4
www.anpec.com.tw
APW8722/A/B/C/D
Electrical Characteristics (Cont.)
Refer to the typical application circuit. These specifications apply over V
VCC
= 12V, T
A
= -40°C to 85°C, unless otherwise
noted. Typical values are at T
A
= 25°C.
Symbol
SOFT-START
V
DISABLE
T
SS
Shutdown Threshold of V
COMP
Internal Soft-Start Interval (Note 4)
-
-
-
1.5
0.4
-
V
ms
Parameter
Test Conditions
Min.
APW8722
Typ.
Max.
Unit
Note 4: Guaranteed by design, not production tested.
Copyright
©
ANPEC Electronics Corp.
Rev. A.3 - Jun., 2013
5
www.anpec.com.tw
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