2-62

HIP6004A

Buck and Synchronous-Rectifier (PWM)
Controller and Output Voltage Monitor

The HIP6004A provides complete control and protection for
a DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive two
N-Channel MOSFETs in a synchronous-rectified buck
topology. The HIP6004A integrates all of the control, output
adjustment, monitoring and protection functions into a single
package.

The output voltage of the converter is easily adjusted and
precisely regulated. The HIP6004A includes a fully TTL-
compatible 5-input digital-to-analog converter (DAC) that
adjusts the output voltage from 2.1VDC to 3.5VDC in 0.1V
increments and from 1.8VDC to 2.05VDC in 0.05V steps.
The precision reference and voltage-mode regulator hold the
selected output voltage to within

1% over temperature and

line voltage variations.

The HIP6004A provides simple, single feedback loop,
voltage-mode control with fast transient response. It includes
a 200kHz free-running triangle-wave oscillator that is
adjustable from below 50kHz to over 1MHz. The error
amplifier features a 15MHz gain-bandwidth product and
6V/ms slew rate which enables high converter bandwidth for
fast transient performance. The resulting PWM duty ratio
ranges from 0% to 100%.

The HIP6004A monitors the output voltage with a window
comparator that tracks the DAC output and issues a Power
Good signal when the output is within

10%. The HIP6004A

protects against over-current and over-voltage conditions by
inhibiting PWM operation. Additional built-in over-voltage
protection triggers an external SCR to crowbar the input
supply. The HIP6004A monitors the current by using the
r

DS(ON)

of the upper MOSFET which eliminates the need for

a current sensing resistor.

6X86TM is a trademark of Cyrix Corporation.

Alpha MicroTM is a trademark of Digital Computer Equipment Corporation.

K6TM is a trademark of Advanced Micro Devices, Inc.

Pentium® is a registered trademark of Intel Corporation.

PowerPCTM is a trademark of IBM.

Features

· Drives Two N-Channel MOSFETs

· Operates from +5V or +12V Input

· Simple Single-Loop Control Design

- Voltage-Mode PWM Control

· Fast Transient Response

- High-Bandwidth Error Amplifier

- Full 0% to 100% Duty Ratio

· Excellent Output Voltage Regulation

1% Over Line Voltage and Temperature

· TTL-Compatible 5-Bit Digital-to-Analog Output Voltage

Selection

- Wide Range . . . . . . . . . . . . . . . . . . . 1.8V

to 3.5V

- 0.1V Binary Steps . . . . . . . . . . . . . . . 2.1V

to 3.5V

- 0.05V Binary Steps . . . . . . . . . . . . . 1.8V

to 2.05V

· Power-Good Output Voltage Monitor

· Over-Voltage and Over-Current Fault Monitors

- Does Not Require Extra Current Sensing Element,

Uses MOSFET's r

DS(ON)

· Small Converter Size

- Constant Frequency Operation

- 200kHz Free-Running Oscillator Programmable from

50kHz to over 1MHz

Applications

· Power Supply for Pentium®, Pentium Pro, Pentium II,

PowerPCTM, K6TM, 6X86TM and AlphaTM Microprocessors

· High-Power 5V to 3.xV DC-DC Regulators

· Low-Voltage Distributed Power Supplies

Pinout

HIP6004A

(SOIC)

TOP VIEW

Ordering Information

PART NUMBER

TEMP.

RANGE (

PACKAGE

PKG.

NO.

HIP6004ACB

0 to 70

20 Ld SOIC

M20.3

SEN

OCSET

VID0

VID1

VID2

VID4

VID3

COMP

LGATE

PGND

OVP

BOOT

UGATE

PHASE

PGOOD

GND

Data Sheet

October 1997

File Number

4417.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207

Intersil Corporation 1999

2-63

Typical Application

Block Diagram

+12V

OUT

PGND

HIP6004A

SEN

COMP

VID0
VID1
VID2
VID3

PGOOD

D/A

GND

OSC

LGATE

UGATE

OCSET

PHASE

BOOT

= +5V OR +12V

OVP

MONITOR AND

PROTECTION

VID4

TTL D/A

CONVERTER

(DAC)

OSCILLATOR

SOFT-

START

REFERENCE

POWER-ON

RESET (POR)

115%

110%

90%

INHIBIT

PWM

COMPARATOR

ERROR

AMP

PGOOD

PWM

OVP

GND

SEN

OCSET

VID0
VID1
VID2
VID3

COMP

DACOUT

OVER-

VOLTAGE

OVER-

CURRENT

GATE

CONTROL

LOGIC

BOOT

UGATE

PHASE

200

VID4

LGATE

PGND

HIP6004A

2-64

Absolute Maximum Ratings

Thermal Information

Supply Voltage, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15V

Boot Voltage, V

BOOT

- V

PHASE

. . . . . . . . . . . . . . . . . . . . . . . . +15V

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

+0.3V

ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2

Operating Conditions

Supply Voltage, V

. . . . . . . . . . . . . . . . . . . . . . . . . . . +12V

10%

Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . 0

C to 70

Junction Temperature Range . . . . . . . . . . . . . . . . . . . . 0

C to 125

Thermal Resistance (Typical, Note 1)

(

C/W)

SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

110

SOIC Package (with 3in

of Copper) . . . . . . . . . . .

Maximum Junction Temperature (Plastic Package) . . . . . . . .150

Maximum Storage Temperature Range . . . . . . . . . . -65

C to 150

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . .300

(SOIC - Lead Tips Only)

CAUTION: Stresses above those listed in "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTE:

is measured with the component mounted on an evaluation PC board in free air.

Electrical Specifications

Recommended Operating Conditions, Unless Otherwise Noted

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

SUPPLY CURRENT

Nominal Supply

UGATE and LGATE Open

POWER-ON RESET

Rising V

Threshold

OCSET

= 4.5V

10.4

Falling V

Threshold

OCSET

= 4.5V

8.2

Rising V

OCSET

Threshold

1.26

OSCILLATOR

Free Running Frequency

RT = OPEN

185

200

215

kHz

Total Variation

< RT to GND < 200k

-15

+15

Ramp Amplitude

OSC

RT = Open

1.9

P-P

REFERENCE and DAC

DAC(VID0-VID4) Input Low Voltage

0.8

DAC(VID0-VID4) Input High Voltage

2.0

DACOUT Voltage Accuracy

-1.0

+1.0

ERROR AMPLIFIER

DC Gain

Gain-Bandwidth Product

GBW

MHz

Slew Rate

COMP = 10pF

GATE DRIVERS

Upper Gate Source

UGATE

BOOT

- V

PHASE

= 12V, V

UGATE

= 6V

350

500

Upper Gate Sink

UGATE

LGATE

= 0.3A

5.5

Lower Gate Source

LGATE

= 12V, V

LGATE

= 6V

300

450

Lower Gate Sink

LGATE

= 0.3A

3.5

6.5

PROTECTION

Over-Voltage Trip (V

SEN

/DACOUT)

115

120

OCSET Current Source

OCSET

= 4.5V

170

200

230

OVP Sourcing Current

OVP

SEN

= 5.5V, V

OVP

= 0V

Soft Start Current

HIP6004A

2-65

POWER GOOD

Upper Threshold (V

SEN

/DACOUT)

SEN

Rising

106

111

Lower Threshold (V

SEN

/DACOUT)

SEN

Falling

Hysteresis (V

SEN

/DACOUT)

Upper and Lower Threshold

PGOOD Voltage Low

PGOOD

= -5mA

0.5

Electrical Specifications

Recommended Operating Conditions, Unless Otherwise Noted (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Typical Performance Curves

FIGURE 1. R

RESISTANCE vs FREQUENCY

FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY

100

1000

SWITCHING FREQUENCY (kHz)

RESIST

ANCE (k

)

100

1000

PULLUP

TO +12V

PULLDOWN TO V

100

200

300

400

500

600

700

800

900

1000

(mA)

SWITCHING FREQUENCY (kHz)

GATE

= 3300pF

GATE

= 1000pF

GATE

= 10pF

UPPER

= C

LOWER

= C

GATE

HIP6004A

2-66

Functional Pin Description

SEN (

Pin 1)

This pin is connected to the converters output voltage. The
PGOOD and OVP comparator circuits use this signal to
report output voltage status and for overvoltage protection.

OCSET (Pin 2)

Connect a resistor (R

OCSET

) from this pin to the drain of the

upper MOSFET. R

OCSET

, an internal 200

A current source

OCS

), and the upper MOSFET on-resistance (r

DS(ON)

) set

the converter over-current (OC) trip point according to the
following equation:

An over-current trip cycles the soft-start function.

SS (Pin 3)

Connect a capacitor from this pin to ground. This capacitor,
along with an internal 10

A current source, sets the soft-

start interval of the converter.

VID0-4 (Pins 4-8)

VID0-4 are the input pins to the 5-bit DAC. The states of
these five pins program the internal voltage reference
(DACOUT). The level of DACOUT sets the converter output
voltage. It also sets the PGOOD and OVP thresholds. Table
1 specifies DACOUT for the 32 combinations of DAC inputs.

COMP (Pin 9) and FB (Pin 10)

COMP and FB are the available external pins of the error
amplifier. The FB pin is the inverting input of the error
amplifier and the COMP pin is the error amplifier output.
These pins are used to compensate the voltage-control
feedback loop of the converter.

GND (Pin 11)

Signal ground for the IC. All voltage levels are measured with
respect to this pin.

PGOOD (Pin 12)

PGOOD is an open collector output used to indicate the
status of the converter output voltage. This pin is pulled low
when the converter output is not within

10% of the

DACOUT reference voltage.

PHASE (Pin 13)

Connect the PHASE pin to the upper MOSFET source. This
pin is used to monitor the voltage drop across the MOSFET
for over-current protection. This pin also provides the return
path for the upper gate drive.

UGATE (Pin 14)

Connect UGATE to the upper MOSFET gate. This pin
provides the gate drive for the upper MOSFET.

BOOT (Pin 15)

This pin provides bias voltage to the upper MOSFET driver.
A bootstrap circuit may be used to create a BOOT voltage
suitable to drive a standard N-Channel MOSFET.

PGND (Pin 16)

This is the power ground connection. Tie the lower MOSFET
source to this pin.

LGATE (Pin 17)

Connect LGATE to the lower MOSFET gate. This pin
provides the gate drive for the lower MOSFET.

(Pin 18)

Provide a 12V bias supply for the chip to this pin.

OVP (Pin 19)

The OVP pin can be used to drive an external SCR in the
event of an overvoltage condition. Output rising 15% more
than the DAC-set voltage triggers a high output on this pin
and disables PWM gate drive circuitry.

RT (Pin 20)

This pin provides oscillator switching frequency adjustment.
By placing a resistor (R

) from this pin to GND, the nominal

200kHz switching frequency is increased according to the
following equation:

Conversely, connecting a pull-up resistor (R

) from this pin

to V

reduces the switching frequency according to the

following equation:

SEN

OCSET

VID0

VID1

VID2

VID4

VID3

COMP

LGATE

PGND

OVP

BOOT

UGATE

PHASE

PGOOD

GND

PEAK

OCS

OCSET

DS ON

(

)

--------------------------------------------

200kHz

(

)

---------------------

to GND)

200kHz

(

)

---------------------

to 12V)

HIP6004A

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