Copyright
ANPEC Electronics Corp.
Rev. A.1 - Apr., 2006
APW7073
www.anpec.com.tw
1
Features
Applications
General Description
The APW7073 is voltage mode, synchronous PWM
controller which drives dual N-channel MOSFETs. The
device integrates all of the control, monitoring and
protecting functions into a single package, provides
one controlled power output with under-voltage and
over-current protections.
The APW7073 provides excellent regulation for
output load variation. The internal 0.6V temperature-
compensated reference voltage is designed to meet
the requirement of low output voltage applications.
The device includes a 200kHz free-running triangle-wave
oscillator that is adjustable from 50kHz to 1000kHz.
The APW7073 with excellent protection functions:
POR, OCP and UVP. The Power-On-Reset (POR)
circuit can monitor the VCC, EN, and OCSET voltage
to make sure the supply voltage exceeds their
threshold voltage while the controller is running.
The Over-Current Protection (OCP) monitors the output
current by using the voltage drop across the upper
and lower MOSFET's R
DS(ON)
. When the output current
reaches the trip point, the controller will run the soft-
start function until the fault events are removed. The
Under-Voltage Protection (UVP) monitors the voltage
at FB pin (V
FB
) for short-circuit protection, when the
V
FB
is less than 50% of V
REF
, the controller will shut-
down the IC directly.
Graphic Cards
Synchronous Buck PWM Controller
Single 12V Power Supply Required
0.6V Reference with 1% Accurate
Shutdown and Soft-start Function
Programmable Frequency Range
from 50 kHz to 1000kHz
Voltage Mode PWM Control Design
Up to 100% Duty Cycle
Under-Voltage Protection
Over-Current Protection
SOP-14, QFN-16 Packages
Lead Free Available (RoHS Compliant)
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.1 - Apr., 2006
APW7073
www.anpec.com.tw
2
Ordering and Marking Information
Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate
termination finish; which are fully compliant with RoHS and compatible with both SnPb and lead-free soldering
operations. 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.
Pin Outs
FB
1
3
2
4
6
5
7
8
OC
SET
SSD
ONE
COMP
SS
REFIN
EN
GND
RT
VCC
GND
LGATE
PVCC
UGATE
BOOT
PHASE
QFN-16
TOP VIEW
12
10
11
9
15
16
14 13
Metal
GND
Pad
(Bottom)
1
3
2
4
6
5
7
BOOT
RT
FB
COMP
GND
EN
14
12
13
11
9
10
8
UGATE
PHASE
OCSET
LGATE
PGND
VCC
SS
SOP-14
TOP VIEW
PVCC
APW7073
Handling Code
Temp. Range
Package Code
APW7073 K :
APW7073
XXXXX
XXXXX - Date Code
Lead Free Code
APW7073 Q :
APW7073
XXXXX
XXXXX - Date Code
Package Code
K : SOP - 14
Q : QFN - 16
Temp. Range
E : -20 to 70 C
Handling Code
TU : Tube
TR : Tape & Reel
TY : Tray (for QFN only)
Lead Free Code
L : Lead Free Device Blank : Original Device
Copyright
ANPEC Electronics Corp.
Rev. A.1 - Apr., 2006
APW7073
www.anpec.com.tw
3
Block Diagram
Gate Control
Oscillator
Soft Start
Power-On
Reset
PHASE
LGATE
RT
FB
SS
GND
EN
VCC
OCSET
BOOT
UGATE
PGND
PVCC
I
OCSET
200uA
I
SS
30uA
50%V
REF
O.C.P
Comparator
Error Amp
PWM
Comparator
U.V.P
Comparator
:
2
COMP
0.27V
O.C.P
Comparator
V
REF
REFIN
(QFN ONLY)
SSDONE
(QFN ONLY)
Sawtooth
Wave
Symbol
Parameter
Rating
Unit
VCC, PVCC
VCC, PVCC to GND
-0.3 to +16
V
BOOT
BOOT to PHASE
-0.3 to +16
V
UGATE,
UGATE to PHASE <400ns pulse width
>400ns pulse width
-5 to BOOT+5
-0.3 to BOOT +0.3
V
LGATE
LGATE to PGND <400ns pulse width
>400ns pulse width
-5 to PVCC+5
-0.3 to PVCC +0.3
V
PHASE
PHASE to GND <400ns pulse width
>400ns pulse width
-5 to +21
-0.3 to 16
V
Absolute Maximum Ratings
Copyright
ANPEC Electronics Corp.
Rev. A.1 - Apr., 2006
APW7073
www.anpec.com.tw
4
Symbol
Parameter
Rating
Unit
RT, OCSET,
SSDONE
RT, OCSET, SSDONE to GND
VCC+0.3
V
FB, COMP, REFIN FB, COMP, REFIN to GND
-0.3 to 7
V
PGND
PGND to GND
-0.3 to +0.3
V
T
J
Junction Temperature Range
-20 to 150
C
T
STG
Storage Temperature
-65 to 150
C
T
SDR
Soldering Temperature (10 Seconds)
300
C
V
ESD
Minimum ESD Rating
2
KV
Absolute Maximum Ratings (Cont.)
Symbol
Parameter
Rating
Unit
VCC, PVCC
IC Supply Voltage
10.8 to 13.2
V
V
IN
Converter Input Voltage
2.2 to 13.2
V
V
OUT
Converter Output Voltage
0.6 to 5
V
I
OUT
Converter Output Current
0 to 25
A
T
A
Ambient Temperature Range
-20 to 70
C
T
J
Junction Temperature Range
-20 to 125
C
Recommended Operating Conditions
Unless otherwise specified, these specifications apply over VCC=12V, and T
A
=-20~70
C. Typical values are at
T
A
=25
C.
Electrical Characteristics
APW7073
Symbol
Parameter
Test Conditions
Min
Typ Max
Unit
INPUT SUPPLY CURRENT
VCC Supply Current
(Shutdown mode)
UGATE, LGATE and EN = GND
0.5
1
mA
I
CC
VCC Supply Current
UGATE and LGATE Open
5
10
mA
POWER-ON RESET
Rising VCC Threshold
9
9.5
10.0
V
Falling VCC Threshold
7.5
8
8.5
V
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.
NOTE 2: The device is ESD sensitive. Handling precautions are recommended.
Copyright
ANPEC Electronics Corp.
Rev. A.1 - Apr., 2006
APW7073
www.anpec.com.tw
5
Unless otherwise specified, these specifications apply over VCC=12V, and T
A
=-20~70
C. Typical values are
at T
A
=25
C.
Electrical Characteristics (Cont.)
APW7073
Symbol
Parameter
Test Conditions
Min
Typ Max
Unit
POWER-ON RESET (Cont.)
Rising V
OCSET
Threshold
1.3
V
V
OCSET
Hysteresis Voltage
0.1
V
Rising EN threshold Voltage
1.3
V
EN Hysteresis Voltage
0.1
V
OSCILLATOR
Accuracy
-15
+15
%
F
OSC
Free Running Frequency
RT = open
200
kHz
Adjustment Range
RT pin: resistor to GND;
resistor to VCC
50
1000 kHz
V
OSC
Ramp Amplitude
(nominal 1.35V to 2.95V)
1.6
V
Duty Duty Cycle Range
0
100
%
REFERENCE
V
REF
Reference Voltage
0.60
V
Reference Voltage Tolerance
-1
+1
%
PWM ERROR AMPLIFIER
Gain Open Loop Gain
R
L
= 10k, C
L
= 10pF
(NOTE3)
88
dB
GBWP Open Loop Bandwidth
R
L
= 10k, C
L
= 10pF
(NOTE3)
15
MHz
SR
Slew Rate
R
L
= 10k, C
L
= 10pF
(NOTE3)
6
V/us
FB Input Current
V
FB
= 0.6V
0.1
1
uA
V
COPM
COMP High Voltage
5.5
V
V
COPM
COMP Low Voltage
0
V
I
COMP
COMP Source Current
COMP = 2V
5
mA
I
COMP
COMP Sink Current
COMP = 2V
5
mA
GATE DRIVERS
I
UGATE
Upper Gate Source Current
BOOT = 12V, V
UGATE
-V
PHASE
= 2V
2.6
A
I
UGATE
Upper Gate Sink Current
BOOT = 12V, V
UGATE
-V
PHASE
= 2V
1.05
A
I
LGATE
Lower Gate Source Current
PVCC = 12V, V
LGATE
= 2V
4.9
A
I
LGATE
Lower Gate Sink Current
PVCC = 12V, V
LGATE
= 2V
1.4
A
R
UGATE
Upper Gate Source Impedance BOOT = 12V, I
UGATE
= 0.1A
2
3
R
UGATE
Upper Gate Sink Impedance
BOOT = 12V, I
UGATE
= 0.1A
1.6
2.4
PDF 
ZIP