ANPEC APW7035AKC-TR, APW7035-20KC-TU, APW7035-20KC-TR, APW7035-12KC-TU, APW7035DKC-TR Datasheet

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APW7035

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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.

APW7035

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Pin Description

Ordering Information

Block Diagram

APW7035-12/19

PGOOD

LGATE

OCSET

PGND

UGATE PHASEDRIVE

VCC

VSEN1

VAUX

FB COMP

1110

129

NCNC

VSEN2

GND

VID0

LGATE

OCSET

PGND

UGATE PHASEDRIVE

VCC

VSEN1

VAUX

FB COMP

1110

129

NCNC

VID1

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

UGATE

PHASE

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

OSCILLATOR

INHIBIT

28mA

4.5V

DAC

VID0

VID1VID2

DAC

APW7035

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Absolute Maximum Ratings

Symbol Parameter Rating Unit

Supply Voltage 15 V

VI , V

Input , Output or I/O Voltage GND -0.3 V to VCC +0.3 V

Operating Ambient Te mperature Range 0 to 70

°C

Junction Temperature Range 0 to 125

°C

STG

Storage Temperature Range -65 to +150

°C

Soldering Temperature 300 ,10 seconds

°C

Electrical Characteristics

Thermal Characteristics

Symbol Parameter Value Unit

Thermal Resistance in Free Air

SOIC SOIC (with 3in

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

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

OCS

Free Running Frequency RT= Open 185 200 215 kHz

∆

OSC

Ramp Amplitude RT= Open 1.9 V

P-P

APW7035

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Electrical Characteristics Cont.

APW7035

Symbol Parameter Test Conditions

Min. Typ. Max.

Unit

DAC and Bandgap Reference

DAC

DACOUT Voltage accuracy -1.0 +1.0 %

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

UGATE

UGATE Source VCC=12V, V

UGATE

=6V 1 A

UGATE

UGATE Sink V

UGATE1-PHASE

=1V 3.5

Ω

LGATE

LGATE Source VCC=12V, V

LGATE

=1V 1 A

LGATE

LGATE Sink V

LGATE

= 1V 3

Ω

Protection

VSEN1 Over-Voltage VSEN1 Rising 115 120 %

Protection

OCSET

OCSET Current Source V

OCSET

= 4.5V

170 200 230

Soft Start Current 28

Power Good

VSEN1 Upper Threshold VSEN1 Rising 109 % VSEN1 Under Voltage

VSEN1 Rising

93 %

VSEN1 Hysteresis Upper /Lower Threshold 2 %

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.

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