APW7065A
Synchronous Buck PWM Controller
Features
•
•
•
•
•
•
•
•
•
•
•
Single 12V Power Supply Required
Fast Transient Response
- 0~90% Duty Ratio
0.8V Reference with 1% Accuracy
Shutdown Function by Controlling COMP
Pin Voltage
Internal Soft-Start (1.7ms) Function
Voltage Mode PWM Control Design
Under-Voltage Protection
Over-Current Protection
- Sense Low Side MOSFET’ R
DS(ON)
s
300KHz Fixed Switching Frequency
SOP-8P Package
Lead Free and Green Devices Available
(RoHS Compliant)
General Description
The APW7065A uses fixed 300kHz switching frequency,
voltage mode, synchronous PWM controller which drives
dual N-channel MOSFETs. The device integrates the
control, monitoring and protection functions into a
single package, provides one controlled power output
with under-voltage and over-current protections.
The APW7065A provides excellent regulation for out-
put load variation. The internal 0.8V temperature-com-
pensated reference voltage is designed to meet the re-
quirement of low output voltage applications. An built-in
digital soft-start with fixed soft-start interval prevents the
output voltage from overshoot as well as limiting the in-
put current.
The APW7065A with excellent protection functions:
POR, OCP and UVP. The Power-On-Reset (POR) cir-
cuit can monitor VCC supply voltage exceeds its thresh-
old voltage while the controller is running, and a built-in
digital soft-start provides output with controlled voltage
rise. The Over-Current Protection (OCP) monitors the
output current by using the voltage drop across the lower
V
IN
Simplified Application Circuit
12V
MOSFET’ R
DS(ON)
, comparing with internal V
OCP
(0.29V),
s
when the output current reaches the trip point, the IC
V
OUT
APW7065A
L
shuts off the converter and initiates a new soft-start
process. After two over-current events are counted,
the device turns off both high-side and low-side
MOSFETs and the converter's output is latched to be
floating. It requires a POR of VCC to restart. The Under-
Voltage Protection (UVP) monitors the voltage of FB pin
Pin Configuration
BOOT
UGATE
GND
LGATE
1
2
3
4
8 PHASE
7 COMP
6 FB
5 VCC
for short-circuit protection, when the V
FB
is less than
50% of V
REF
(0.4V), the controller will shutdown the IC
directly.
Applications
•
•
Graphics Card
Mother Board
SOP-8P
(APW7065A)
=
Thermal Pad
(Connect to GND Plane for better heat dissipation)
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 - Mar., 2008
1
www.anpec.com.tw
APW7065A
Ordering and Marking Information
APW7065A
Assembly Material
Handling Code
Temp. Range
Package Code
APW7065A KA :
APW7065
XXXXX A
Package Code
KA : SOP-8P
Operating Ambient Temp. Range
E : -20 to 70 °C
Handling Code
TR : Tape & Reel
Assembly Material
L : Lead Free Device G : Halogen and Lead Free Device
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-020C 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).
Absolute Maximum Ratings
(Note 1)
Symbol
V
CC
V
BOOT
V
UGATE
V
LGATE
V
PHASE
V
COMP
, V
FB
T
J
T
STG
T
SDR
VCC to GND
BOOT to PHASE
UGATE to PHASE
<400ns pulse width
>400ns pulse width
LGATE to GND
PHASE to GND
COMP, FB to GND
Junction Temperature Range
Storage Temperature
Maximum Lead Soldering Temperature, 10 Seconds
<400ns pulse width
>400ns pulse width
<200ns pulse width
>200ns pulse width
Parameter
Rating
-0.3 ~ 16
-0.3 ~ 16
-5 ~ V
BOOT
+5
-0.3 ~ V
BOOT
+0.3
-5 ~ V
CC
+5
-0.3 ~ V
CC
+0.3
-10 ~ 30
-0.3 ~ 16
-0.3 ~ 7
-20 ~ 150
-65 ~ 150
260
Unit
V
V
V
V
V
V
o
o
o
C
C
C
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
Thermal Characteristics
Symbol
θ
JA
θ
JC
Parameter
Junction-to-Ambient Thermal Resistance in Free Air
SOP-8P
Junction-to-Case Thermal Resistance
SOP-8P
Value
55
20
Unit
o
C/W
C/W
o
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
2
www.anpec.com.tw
APW7065A
Recommended Operating Conditions
Symbol
V
CC
V
OUT
V
IN
I
OUT
T
A
T
J
VCC Supply Voltage
Converter Output Voltage
Converter Input Voltage
Converter Output Current
Ambient Temperature Range
Junction Temperature Range
Parameter
Range
10.8 ~ 13.2
0.8 ~ 5
2.9 ~ 13.2
0 ~ 30
-20 ~ 70
-20 ~ 125
Unit
V
V
V
A
o
C
C
o
Electrical Characteristics
Unless otherswise specified, these specifications apply over V
CC
=12V, and T
A
=-20~70
o
C. Typlcal values are at T
A
=25
o
C.
APW7065A
Min
SUPPLY CURRENT
I
VCC
VCC Nominal Supply Current
VCC Shutdown Supply Current
POWER-ON RESET
Rising VCC Threshold
Falling VCC Threshold
COMP Shutdown Threshold
COMP Shutdown Hysteresis
OSCILLATOR
F
OSC
∆V
OSC
V
REF
Free Running Frequency
Ramp Amplitude
270
-
300
1.6
345
-
KHz
V
P-P
V
%
9
7.5
-
-
9.5
8
1.2
0.1
10
8.5
-
-
V
V
V
V
UGATE and LGATE Open
UGATE, LGATE = GND
-
-
5
1
10
2
mA
mA
Typ
Max
Symbol
Parameter
Test Conditions
Unit
REFERENCE VOLTAGE
Reference Voltage
Accuracy
ERROR AMPLIFIER
Gain
GBWP
SR
Open Loop Gain
Open Loop Bandwidth
Slew Rate
FB Input Current
V
COMP
V
COMP
I
COMP
I
COMP
COMP High Voltage
COMP Low Voltage
COMP Source Current
COMP Sink Current
V
COMP
=2V
V
COMP
=2V
R
L
=10K, C
L
=10pF
(Note2)
R
L
=10K, C
L
=10pF
V
FB
= 0.8V
(Note2)
(Note2)
Measured at FB Pin
T
A
=-20~70°C
-
-1.0
0.8
-
-
+1.0
-
-
-
-
-
-
-
-
88
15
6
0.1
5.5
0
5
5
-
-
-
1
-
-
-
-
dB
MHz
V/µs
µA
V
V
mA
mA
R
L
=10K, C
L
=10pF
(Note2)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
3
www.anpec.com.tw
APW7065A
Electrical Characteristics (Cont.)
Unless otherswise specified, these specifications apply over V
CC
=12V, and T
A
=-20~70
o
C. Typlcal values are at T
A
=25
o
C.
APW7065A
Symbol
GATE DRIVERS
I
UGATE
I
UGATE
I
LGATE
I
LGATE
R
UGATE
R
UGATE
R
LGATE
R
LGATE
T
D
V
OCP
V
UVP
Upper Gate Source Current
Upper Gate Sink Current
Lower Gate Source Current
Lower Gate Sink Current
Upper Gate Source Impedance
Upper Gate Sink Impedance
Lower Gate Source Impedance
Lower Gate Sink Impedance
Dead Time
V
BOOT
= 12V, V
UGATE
-V
PHASE
= 2V
V
BOOT
= 12V, V
UGATE
-V
PHASE
= 2V
V
CC
= 12V, V
LGATE
= 2V
V
CC
= 12V, V
LGATE
= 2V
V
BOOT
= 12V, I
UGATE
= 0.1A
V
BOOT
= 12V, I
UGATE
= 0.1A
V
CC
= 12V, I
LGATE
= 0.1A
V
CC
= 12V, I
LGATE
= 0.1A
-
-
-
-
-
-
-
-
-
2.6
1.05
4.9
1.4
2
1.6
1.3
1.25
20
-
-
-
-
3
2.4
1.95
1.88
-
A
A
A
A
Ω
Ω
Ω
Ω
ns
Parameter
Test Conditions
Min
Typ
Max
Unit
PROTECTIONS
Over-Current Reference Voltage
Under-Voltage Threshold
Trip Point
Soft-Start Interval
Delay Time
(Note 2)
T
A
=-20~70°C
Percent of V
REF
0.27
45
0.29
50
0.31
55
V
%
SOFT-START
T
SS
T
delay
1
1.1
1.7
1.6
2.6
2.1
ms
ms
Note 2 : Guaranteed by design.
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
4
www.anpec.com.tw
APW7065A
Typical Operating Characteristics
Switching Frequency vs. Junction Temperature
310
Reference Voltage vs. Junction Temperature
0.804
V
CC
=12V
Switching Frequency(KHz)
305
300
295
290
285
280
275
-40
V
CC
=12V
0.802
Reference Voltage(V)
0.8
0.798
0.796
0.794
0.792
-20
0
20
40
60
80
100 120
-40
-20
0
20
40
60
80
100
120
Junction Temperature (°C )
Junction Temperature (°C )
UGATE Source Current vs. UGATE Voltage
3.5
3
UGATE Sink Current vs. UGATE Voltage
3
2.5
V
BOOT
=12V
UGATE Source Current (A)
V
BOOT
=12V
2.5
2
1.5
1
0.5
0
0
2
4
6
8
10
12
UGATE Sink Current (A)
2
1.5
1
0.5
0
0
2
4
6
8
10
12
UGATE Voltage (V)
UGATE Voltage (V)
LGATE Source Current vs. LGATE Voltage
6
5
4
3
2
1
0
0
2
4
6
8
10
12
V
CC
=12V
LGATE Sink Current vs. LGATE Voltage
3.5
3
LGATE Source Current (A)
LGATE Sink Current (A)
2.5
2
1.5
1
0.5
0
0
2
4
6
8
10
12
V
CC
=12V
LGATE Voltage (V)
LGATE Voltage (V)
Copyright
©
ANPEC Electronics Corp.
Rev. A.4 - Mar., 2008
5
www.anpec.com.tw
FPGA/CPLD
