Copyright
ANPEC Electronics Corp.
Rev. A.1 - May, 2001
APW7036
www.anpec.com.tw
1
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.
Advanced Dual PWM Power Controller
2 Regulated Voltage are provided
-
SYNC Switching Power Internal Reference
Voltage (1.25V , 1.5V , 1.8V and 2.05V)
-
ASYNC Switching Power Internal Reference
Voltage (1.5V)
Simple Single-Loop Control Design
-
Voltage-Mode PWM Control
Excellent Output Voltage Regulation
-
SYNC Output :
1% Over Temperature
-
ASYNC Output :
3% Over Temperature
Fast Transient Response
-
High-Bandwidth Error Amplifier
-
Full 0% to 100% Duty Ratio
Power-Good Output Voltage Monitor
Over-Voltage and Over-Current Fault Monitors
Small Converter Size
-
Constant Frequency Operation(200kHz)
-
Programmable Oscillator from 50kHz to 800kHz
-
Reduce External Component Count
20Pin , SOIC Package
Features
Applications
High Power 5V to 2.5 or 3.3V DC-DC Regulator
VGA Card Power Regulation
General Description
The APW7036 provides complete power control and
protection for two DC-DC converter optimized in VGA
Card applications. It integrates two PWM controllers ,
as well as the monitoring and protection function into
a single package.
The APW7036 provides simple , single feedback loop
, voltage mode control with fast transient response.
The output voltage of the SYNC converter can be pre-
cisely regulated to as low as V
REF
(1.25V , 1.5V , 1.
8V and 2.05V) , with a maximum tolerence of
1.0%
over temperature.
The APW7036 can provides in excess of 14A of out-
put current for an on-board DC/DC converter. It can
monitors all the output voltage , and a single Power
Good signal is issued when the SYNC output is within
10
%
of the V
REF
setting and the ASYNC output lev-
els is above under-voltage levels. Additional built-in
over-voltage protection for the SYNC output uses the
lower MOSFET to prevent output voltage above 115
%
of the V
REF
setting. The PWM controller's over-cur-
rent function monitor the output current by sensing
the voltage drop across the upper MOSFET's R
DS(ON)
,
eliminating the need for a current sensing resistor .
Pin Description
V C C
G A T E
P H A S E 2
F B 2
O C S E T 1
F B 1
C O M P
O C S E T 2
P G O O D
S S
V S E N
N C
V A U X
1
2
3
4
5
6
7
8
1 0
9
1 6
1 5
1 4
1 3
G N D
P G N D
N C
1 7
1 8
1 9
2 0
1 2
1 1
U G A T E
L G A T E
P H A S E 1
F A U L T / R T
Copyright
ANPEC Electronics Corp.
Rev. A.1 - May, 2001
APW7036
www.anpec.com.tw
2
Ordering Information
Absolute Maximum Ratings
Symbol
Parameter
Rating
Unit
VCC
Supply Voltage
15
V
V
I
, V
O
Input , Output or I/O Voltage
GND -0.3 V to V12 +0.3
V
T
A
Operating Ambient Temperature Range
0 to 70
C
T
J
Junction Temperature Range
0 to 125
C
T
STG
Storage Temperature Range
-65 to +150
C
T
S
Soldering Temperature
300 ,10 seconds
C
Block Diagram
G A T E
C O N T R O L
S O F T - S T A R T
A N D F A U L T
LOGIC
G A T E
C O N T R O L
O C S E T 2
G A T E
P H A S E 2
F B 2
G N D
P G N D
L G A T E
P H A S E 1
U G A T E
P G O O D
O C S E T 1
V S E N
F B 1
S S
F A U L T
200uA
V C C
D R I V E 2
O C 2
INHIBIT
P W M 2
1.5V
E R R O R
A M P 2
1.05V
V C C
OSCILLATOR
4.5V
V
R E F
E R R O R
A M P 1
0 V
F A U L T
O C 1
P W M 1
V C C
L O W E R
D R I V E
V C C
D R I V E 1
INHIBIT
1 1 5 %
9 0 %
1 1 0 %
200uA
C O M P
28uA
P O R
V A U X
V C C
APW 7036
V oltage Code
12 : 1.25V 15 : 1.50V 18 : 1.80V
20 : 2.05V
P ackage Code
K : S O P -20
Tem p. Range
C : 0 to 70 C
Handling Code
TU : Tube TR : Tape & Reel
Lead Free Code
L : Lead Free Device B lank : O riginal Device
Handling Code
Tem p. Range
P ackage Code
V oltage Code
Lead Free Code
Copyright
ANPEC Electronics Corp.
Rev. A.1 - May, 2001
APW7036
www.anpec.com.tw
3
Thermal Characteristics
Symbol
Parameter
Value
Unit
R
JA
Thermal Resistance in Free Air
SOIC
SOIC (with 3in
2
of Copper)
75
65
C/W
Electrical Characteristics
(Recommended operating conditions , Unless otherwise noted) Refer to Block and Simplified Power System
Diagrams , and Typical Application Schematic
APW7036
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
V
CC
Supply Current
I
CC
Nominal Supply Current
UGATE , LGATE , GATE ,
open
9
mA
Power-on Reset
Rising VCC Threshold
Vocset=4.5V
10.4
V
Falling VCC Threshold
Vocset=4.5V
8.2
V
Rising VAUX Threshold
Vocset=4.5V
2.5
V
VAUX Threshold Hysteresis
Vocset=4.5V
0.5
V
Rising V
OCSET
Threshold
1.26
V
Oscillator
F
OCS
Free Running Frequency
RT= Open
185
200
215
kHz
V
OSC
Ramp Amplitude
RT= Open
1.9
V
P-P
Switching Controller Reference Voltage
V
REF
Reference Voltage
APW7036-12
APW7036-15
APW7036-18
APW7036-20
1.25
1.50
1.80
2.05
V
Reference Voltage accuracy
-1.0
+1.0
%
V
FB2
Reference Voltage
1.5
V
Reference Voltage accuracy
-3.0
+3.0
%
Synchronous PWM Controller Error Amplifier
DC Gain
88
dB
GBWP Gain-Bandwidth Product
15
MHz
SR
Slew Rate
COMP=10pF
6
V/
s
PWM Controllers Gate Drivers
I
UGATE
UGATE1,GATE Source
V
CC
=12V, V
UGATE 1,GATE
=6V
1
A
R
UGATE
UGATE1,GATE Sink
V
UGATE1,GATE
=1V
3.5
Copyright
ANPEC Electronics Corp.
Rev. A.1 - May, 2001
APW7036
www.anpec.com.tw
4
Electrical Characteristics Cont.
Functional Pin Description
UGATE (Pin 1)
Connect UGATE pin to the synchronous PWM
converter's upper MOSFET gate. This pin provides
the gate drive for the upper MOSFET.
VCC (Pin 2)
Provide a 12V bias supply for the IC to this pin. This
pin also provides the gate bias charge for all the
MOSFETs controlled by the IC. The voltage at this
pin is monitored for Power-On Reset purposes.
GATE (Pin 3)
Connect GATE pin to the standard BUCK PWM
converter's MOSFET gate. This pin provides the gate
drive for the MOSFET.
PHASE2 (Pin 4)
Connect the PHASE2 pin to the standard BUCK PWM
converter's MOSFET source. This pin is used to moni-
tor the voltage drop across the MOSFET for over-cur-
rent protection.
PGOOD (Pin 5)
PGOOD is an open collector output used to indicate
the status of the output voltages. This pin is pulled
low when the synchronous regulator output is not within
10% of the reference voltage or the other output is
below under-voltage thresholds.
NC (Pin 10, 13)
No Connection.
OCSET1 , 2 (Pin 17 , 6)
Connect a resistor (R
OCSET
) from this pin to the drain
of the PWM converter's MOSFET. R
OCSET
, an internal
200
A current source (I
OCSET
) , and the MOSFET's
on-resistance(r
DS(ON)
) set the converter over-current
APW7036
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
PWM Controllers Gate Drivers
I
LGATE
LGATE Source
V
CC
=12V, V
LGATE
=1V
1
A
R
LGATE
LGATE Sink
V
LGATE
= 1V
3
Protection
VSEN Over-Voltage (VSEN/V
REF
) VSEN Rising
115
120
%
I
OVP
FAULT Souring Current
V
FAULT/RT
=2.0V
8.5
mA
I
OCSET
OCSET1,2 Current Source
V
OCSET
= 4.5V
DC
170
200
230
A
I
SS
Soft Start Current
28
A
Power Good
VSEN
Upper Threshold
(VSEN/
V
REF
)
VSEN1 Rising
110
%
VSEN
Under Voltage (VSEN/V
REF
) VSEN1 Rising
94
%
VSEN
Hysteresis
(VSEN/
V
REF
)
Upper /Lower Threshold
2
%
V
PGOOD
PGOOD Voltage Low
I
PGOOD
= -4mA
0.8
V
Copyright
ANPEC Electronics Corp.
Rev. A.1 - May, 2001
APW7036
www.anpec.com.tw
5
Functional Pin Description Cont.
(OC) trip point according to the following equation:
I
PEAK
=
An over-current trip cycles the soft-start function.
FB2 (Pin 7)
This pin provides the feedback for the non-synchro-
nous switching regulator. A resistor driver is con-
nected from this pin to regulator output and GND that
sets the output voltage. The value of the resistor con-
nected from regulator output to FB2 must be less than
150
.
SS (Pin 8)
Connect a capacitor from this pin to ground. This
capacitor , along with an internal 28
A current source
, sets the soft-start interval of the converter.
FAULT / RT (Pin 9)
This pin provides oscillator switching frequency
adjustment. By placing a resistor (R
T
) from this pin
to GND , the nominal 200kHz switching frequency is
increased. Conversely , connecting a pull-up resistor
(R
T
) from this pin to VCC reduces the switching
frequency.
Nominally , the voltage at this pin is 1.26V. In the
event of an over-voltage or over-current condition , this
pin is internally pulled to VCC.
VAUX (Pin 11)
The +3.3V input voltage at this pin is monitored for
power-on reset (POR) purposes.
GND (Pin 12)
Signal ground for the IC. All voltage levels are mea-
sured with respect to this pin.
COMP and FB1 (Pins 14 , and 15)
COMP and FB1 are the available external pins of the
synchronous PWM regulator error amplifier. The FB1
pin is the inverting input of the error amplifier. Simi-
larly , the COMP pin is the error amplifier output. These
pins are used to compensate the voltage-mode con-
trol feedback loop of the synchronous PWM converter.
VSEN (Pin 16)
This pin is connected to the synchronous PWM
converters's output voltage. The PGOOD and OVP
comparator circuits use this signal to report output
voltage status and for over-voltage protection.
PGND (Pin 18)
This is the power ground connection. Tie the syn-
chronous PWM converter's lower MOSFET source to
this pin.
LGATE (Pin19)
Connect LGATE to the synchronous PWM converter's
lower MOSFET gate. This pin provides the gate drive
for the lower MOSFET.
PHASE1 (Pin 20)
Connect the PHASE1 pin to the synchronous PWM
converter's upper MOSFET source. This pin is used
to monitor the voltage drop across the upper MOSFET
for over-current protection.
I
OCSET
* R
OCSET
r
DS(ON)
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