ANPEC APW7055D-NC-TU, APW7055D-NC-TR, APW7055C-NC-TU, APW7055C-NC-TR, APW7055B-NC-TU Datasheet

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APW7055

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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.

Features

••

•

Operates from 5V input supply

••

•

2 Regulated Voltage are provided

− Standard Buck Switching Power for VMEM

(2.5V)

− Linear Controller with Source-Sink Regula

tion for VTT(1.25V)

••

• Simple Single-Loop Control Design

− Voltage-Mode PWM Control

••

• Excellent Output Voltage Regulation

− VMEM Output : V

MEM

±1.5% Over Tem-per

ature

− VTT Output : 1/2 VIN ±25mV Over Tempera-

ture

••

• Fast Transient Response

− Built-in Feedback Compensation

− Full 0% to 100% Duty Ratio

••

• Over-Voltage and Over-Current Fault Monitors

••

• Constant Frequency Operation(200kHz)

• •

• 16 pins, SSOP Package

Applications

••

• M/B DDR Power Regulation

••

• AGP/PCI Graphics Power Regulation

••

• SSTL-2 Termination

General Description

The APW7055 provides the power control and protec-

tions for two output voltages on M/B DDR applications.

It integrates one PWM controller , one source-sink

linear controller(LC) for DDR source-sink purpose, as

well as the monitor and protection functions into a

single package. The PWM controller supplies the

VMEM(2.5V) with a standard buck converter. The

source-sink linear controller regulates VTT(1.25V)

power for DDR Termination.

Additional built-in over-voltage protection (OVP) will

be started when the VMEM output is above 115% of

the internal DAC setting(V

DAC

) . OVP function will shut-

down the upper MOSFET and disable all output volt-

age . The PWM controllers over-current function moni-

tors the output current by sensing the voltage drop

across the upper MOSFETs r

DS(ON)

, eliminating the

need for a current sensing resistor .

Advanced PWM and Linear Power Controller

Pin Description

SINK

PHASE

MEM1

PGND

BOOT

UGATE

VCC

GND

MEM0

OCSET

VSEN

SOURCE

VIN

)29%##

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Ordering Information

Block Diagram

APW7055

Voltage Code A : 2.40~2.55V B : 2.60~2.75 V C : 2.80~2.95V D : 3.00~3.15 V Package Code N : S SO P-1 6 Tem p. R ang e C : 0 to 70

C Handling Code TU : Tub e T R : Tape & Re el

Handling Code

Tem p. R ang e

Package Code

Voltage Code

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 Temperature Range 0 to 70

Junction Temperature Range 0 to 125

STG

Storage Temperature Range -65 to +150

Soldering Temperature 300 ,10 seconds

VCC

Power On

Reset

Therm al

Protection

Control

So ft Sta rt and

Fa ult Lo gic

O sc illator

Gate

Control

TT L D /A

Converter

SOURCE

SINK

VCC SS OCSET

BOOT

PGND

VSEN

MEM0

MEM1

GND

4.5V

IN H IBIT

PWM

OCP

OVP

115%

PHASE

UGATE

MEM

200uA

E.A

50%

)29%##

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Electrical Characteristics

Thermal Characteristics

Symbol Parameter Value Unit

Thermal Resistance in Free Air

SOIC SOIC (with 3in

of Copper)

75 65

C/W

1. Recommended operating conditions, Unless otherwise noted.

2. Refer to Block and Simplified Power System Diagrams , and Typical Application Schematic.

APW7055

Symbol Parameter Test Conditions

Min. Typ. Max.

Unit

Supply Current

Nominal Supply Current SD=0V, GATE Drive Open 7

Shutdown Supply Current SD=5V 2.7

Power-on Reset

Rising VCC Threshold Vocset=3V 4.2 4.6

Falling VCC Threshold Vocset=3V 3.6

OCSET

Rising V

OCSET

Threshold 1.26 V

Shutdown Input High Voltage

2.0

Shutdown Input Low Voltage 0.8

Oscillator

OSC

Free Running Frequency 185 200 215 kHz

∆

OSC

Ramp Amplitude 1.9 V

PWM Controller Reference Voltage

DAC

DAC Voltage Accuracy -1.5 +1.5 %

MEM0-1 Input High Voltage 2.0

MEM0-1 Input Low Voltage 0.8

Source-Sink Linear Controller

SOURCE

Source Regulation Voltage -10mV 0.495VIN +10mV

SINK

Sink Regulation Voltage -10mV 0.505VIN +10mV

Source

Source Drive Current 0.8

SINK

Sink Drive Current 0.8

PWM Controllers Gate Drivers

VCC=5V,V

BOOT

=9.5V,

UGATE

=6V

UGATE

UGATE Source

=12V,V

BOOT

=9.5V,

UGATE

=6V

VCC=5V,V

UGATE

=1V 3

GATE

UGATE Sink

VCC=12V, V

UGATE

=6V 3 3.5

Ω

Rev.A.1 - Dec., 2001

)29%##

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Functional Pin Description

VCC (Pin 1)

Provide a +5V bias supply for the IC to this pin. This

pin also provides the gate bias charge for the MOS

FETs of the source-sink regulator. The voltage at th

is pin is monitored for Power-On Reset (POR)

purposes.

SS (Pin 2)

This pin provides the soft start for the standard buck

converter and source-sink regulator. Connect a ca-

pacitor from this pin to ground.This capacitor, along

with an internal 28uA current source,sets the soft-start

interval of the converter and preventing the outputs from

overshoot as well as limiting the input current .

SD (Pin 3)

The pin shuts down all the outputs. A TTL-compatible,

logic level high signal applied at this pin immediately

discharges the soft-start capacitor,disabling all the

outputs.When IC re-enabled, the IC undergoes a new

soft-start cycle.Left open, this pin is pulled low by an

internal pull-down resistor,enabling operation.

SOURCE (Pin 4)

Connect the pin to the upper MOSFET gate drive of

the source-sink regulator. This pin is used to drive the

1. Recommended operating conditions, Unless otherwise noted.

2. Refer to Block and Simplified Power System Diagrams , and Typical Application Schematic.

APW7055

Symbol Parameter Test Conditions

Min. Typ. Max.

Unit

Protection

VSEN O.V. trip point (VSEN/V

DAC

) VSEN Rising 115 120

VSEN O.V. Hysteresis 2

OCSET

Ocset Current Source Vocset=3V 170 200 230

Soft start Current 28

upper external MOSFET as a source regulator.

SINK (Pin 5)

Connect the pin to the lower MOSFET gate drive of

the source-sink regulator.This pin is used to drive the

lower external MOSFET as a sink regulator.

FB (Pin 6)

Connect this pin to output of the source-sink regulator.

This pin provide the voltage feedback path for source

and sink regulators. This pin is internally connected

to the negative input of the source controller, and also

connected to the positive input of the sink controller.

VIN (Pin 7)

Connect this pin to a voltage source. Two voltages,

above 0.5VIN, are generated by an internal resistor

divider as the reference voltage of the source and sink

controllers. The internal resistor divider provides an

offset voltage to ensure higher sink regulation voltage

and prevent an direct current path through the upper

and lower MOSFETs, damaging the two MOSFETs.

GND (Pin 8)

Signal ground for the IC. All voltage levels are mea

sured with respect to this pin voltage protection.

Electrical Characteristics (Cont.)

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