Copyright ANPEC Electronics Corp.
Rev. A.4 - Jul., 2001
APW7035
www.anpec.com.tw1
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 PWM and Linear Power Control
Features
••
••
•
2 Regulated Voltage are provided
− Switching Power for Fixed Voltage (1.25V /
2.05V) or Adjustable Voltage
− Linear Regulator for FBVDDQ(2.5V)
••
••
•
Simple Single-Loop Control Design
− Voltage-Mode PWM Control
••
••
• Excellent Output Voltage Regulation
− PWM Output : ±1%
− Linear Output : ±3%
••
••
• 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)
− Reduce External Component Count
Applications
••
••
• Motherboard Power Regulation for Computers
••
••
• Low-Voltage Distributed Power Supplies
••
••
• VGA Card Power Regulation
••
••
• Termination Voltage
General Description
The APW7035 integrates PWM controller and linear
controller , as well as the monitoring and protection
functions into a single package , which provides two
controlled power outputs with over-voltage and overcurrent protections. The PWM controller regulates
the DDR reference voltage (1.25V) or GPU Voltage
(2.05V) with a synchronous-rectified buck converter.
The linear controller regulates power for Memory
Voltage.
The precision reference and voltage-mode PWM
control provide ±1% static regulation. The linear controller drives an external N-channel MOSFET to provide adjustable voltage.
The APW7035 monitors all the output voltages , and
a single Power Good signal is issued when the PWM
Voltage is within ±10% of the DAC setting and the
Linear regulator output levels are above their undervoltage thresholds. Additional built-in over-voltage protection for the PWM output uses the lower MOSFET
to prevent output voltages above 1 15% of the DAC
setting. The PWM over-current function monitors the
output current by using the voltage drop across the
upper MOSFET’s R
DS(ON)
, eliminating the need for a
current sensing resistor.
The APW7035A/B/C/D support a TTL 3-input Digital
to Analog converter that adjusts the synchronousrectified buck converter output from 1.00V to 3.20V ,
referenc to T able1.
Copyright ANPEC Electronics Corp.
Rev. A.4 - Jul., 2001
APW7035
www.anpec.com.tw2
Pin Description
Ordering Information
Block Diagram
APW7035-12/19
PGOOD
LGATE
OCSET
PGND
UGATE
PHASEDRIVE
VCC
SS
VSEN1
VAUX
FB
COMP
1
1110
129
13
16
8
14
15
7
6
17
18
19
20
5
4
3
2
NCNC
NC
SD
VSEN2
NC
GND
VID0
LGATE
OCSET
PGND
UGATE
PHASEDRIVE
VCC
SS
VSEN1
VAUX
FB
COMP
1
1110
129
13
16
8
14
15
7
6
17
18
19
20
5
4
3
2
NCNC
VID1
SD
VSEN2
VID2
GND
APW7035A/B/C/D
APW7035
Voltage Code
12 : 1.25V 20 : 2.05V A : 1.00V~1.35V
B : 1.40V~1.75V C : 1.80V~2.40V D : 2.50V~3.20V
Package Code
K : SOP
Temp. Range
C : 0 to 70 C
Handling Code
TU : Tube TR : Tape & Reel
°
Handling Code
Temp. Range
Package Code
Voltage Code
PGOOD
Power-on
Reset (POR)
VCC
200mA
1.10
+
-
GATE
CONTROL
+
PWM
COMP1
SYNCH
DRIVE
OV
UGATE
PHASE
V
CC
LGATE
PGND
COMPFB
OCSETVSEN1
ERROR
AMP1
PWM1
VCC
INHIBIT
OC1
VAUX
DRIVE
+
-
+
-
+
-
+
-
0.90
1.15
VAUX
GND
VSEN2
+
-
0.75
+
-
1.5V
+
-
DAC
+
-
SOFT
START &
FAULT
LOGIC
SS
OSCILLATOR
INHIBIT
SD
V
CC
28mA
4.5V
DAC
+
-
VID0
VID1VID2
V
DAC
Copyright ANPEC Electronics Corp.
Rev. A.4 - Jul., 2001
APW7035
www.anpec.com.tw3
Absolute Maximum Ratings
Symbol Parameter Rating Unit
V
CC
Supply Voltage 15 V
VI , V
O
Input , Output or I/O Voltage GND -0.3 V to VCC +0.3 V
T
A
Operating Ambient Te mperature 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
Electrical Characteristics
Thermal Characteristics
Symbol Parameter Value Unit
R
θ
JA
Thermal Resistance in Free Air
SOIC
SOIC (with 3in
2
of Copper)
75
65
°C/W
(Recommended operating conditions , Unless otherwise noted) Refer to Block and Simplified Power System
Diagrams , and Typical Application Schematic.
APW7035
Symbol Parameter Test Conditions
Min. Typ. Max.
Unit
VCC Supply Current
I
CC
Nominal Supply Current
UGATE, LGATE, DRIVE
open
9mA
Power-on Reset
Rising VCC Threshold Vocset=4.5V 10.7 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
Copyright ANPEC Electronics Corp.
Rev. A.4 - Jul., 2001
APW7035
www.anpec.com.tw4
Electrical Characteristics Cont.
APW7035
Symbol Parameter Test Conditions
Min. Typ. Max.
Unit
DAC and Bandgap Reference
V
DAC
DACOUT Voltage accuracy -1.0 +1.0 %
V
BG
Bandgap Reference Voltage 1.265 V
Bandgap Reference Tolerance -2.5 +2.5 %
Linear Regulators
Regulation 3 %
Output Drive Current VAUX-V
DRIVE
>0.6V 20 40 mA
Synchronous PWM Controller Error Amplifier
DC Gain 88 dB
GBWP Gain-Bandwidth Produc t 15 MHz
SR Slew Rate COMP=10pF 6
V/µs
PWM Controller Gate Driver
I
UGATE
UGATE Source VCC=12V, V
UGATE
=6V 1 A
R
UGATE
UGATE Sink V
UGATE1-PHASE
=1V 3.5
Ω
I
LGATE
LGATE Source VCC=12V, V
LGATE
=1V 1 A
R
LGATE
LGATE Sink V
LGATE
= 1V 3
Ω
Protection
VSEN1 Over-Voltage VSEN1 Rising 115 120 %
Protection
I
OCSET
OCSET Current Source V
OCSET
= 4.5V
DC
170 200 230
µ
A
I
SS
Soft Start Current 28
µ
A
Power Good
VSEN1 Upper Threshold VSEN1 Rising 109 %
VSEN1 Under Voltage
VSEN1 Rising
93 %
VSEN1 Hysteresis Upper /Lower Threshold 2 %
V
PGOOD
PGOOD Voltage Low I
PGOOD
= -4mA 0.8 V
Functional Pin Description
(Recommended operating conditions , Unless otherwise noted) Refer to Block and Simplified Power System
Diagrams , and Typical Application Schematic.
VCC (Pin 1)
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 (POR) purposes.
DRIVE (Pin 2)
Connect this pin to the gate of an external MOSFET.
This pin provides the drive for the FBVDDQ
regulator’s pass transistor.