Intersil Corporation HIP6005 Datasheet

HIP6005

Data Sheet March 2000 File Number 4276.2

Buck Pulse-Width Modulator (PWM)
Controller and Output Voltage Monitor

The HIP6005 provides complete control and protection for a
DC-DC converter optimized for high-performance
microprocessor applications. It is designed to drive an
N-Channel MOSFET in a standard buck topology. The
HIP6005 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 HIP6005 includes a 5-input digital­to-analog converter (DAC) that adjusts the output voltage
from 2.1V
to 2.1VDC 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 HIP6005 provides simple, single feedbac k loop, voltage­mode 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 f eatures a
15MHz gain-bandwidth product and 6V/µs slew rate which
enables high converter bandwidth for f ast tr ansient
performance. The resulting PWM duty ratio ranges from 0% to
100%.

The HIP6005 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 HIP6005
protects against over-current conditions by inhibiting PWM
operation. Built-in over-voltage protection triggers an
external SCR to crowbar the input supply. The HIP6005
monitors the current by using the r
MOSFET which eliminates the need for a current sensing
resistor.

to 3.5VDCin 0.1Vincrements and from 1.3V

DC

of the upper

DS(ON)

DC

Features

• Drives N-Channel MOSFET

• 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

• 5-Bit Digital-to-Analog Output Voltage Selection

- Wide Range . . . . . . . . . . . . . . . . . . . 1.3V

DC

to 3.5V

- 0.1V Binary Steps. . . . . . . . . . . . . . . 2.1VDC to 3.5V

- 0.05V Binary Steps. . . . . . . . . . . . . . 1.3VDC to 2.1V

• Power-Good Output Voltage Monitor

• Over-Voltage and Over-Current Fault Monitors

- Does Not Require Extra Current Sensing Element,
Uses MOSFETs 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, PowerPC™and
Alpha™ Microprocessors

•

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

•

Low-Voltage Distributed Power Supplies

.

DC
DC
DC

Ordering Information

TEMP.

PART NUMBER

HIP6005CB 0 to 70 20 Ld SOIC M20.3

RANGE (oC) PACKAGE

Alpha™ is a trademark of Digital Equipment Corporation.

Pentium® is a registered trademark of Intel Corporation.

PowerPC™ is a trademark of IBM.

1

PKG.

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

NO.

Pinout

1

V

SEN

OCSET

1-888-INTERSIL or 321-724-7143

SS
VID0
VID1
VID2
VID3
VID4

COMP

FB

2
3
4
5
6
7
8
9

10

HIP6005

(SOIC)

TOP VIEW

R

20

T

OVP

19

V

18

CC

NC

17

NC

16

BOOT

15

UGATE

14

PHASE

13
12

PGOOD

11

GND

| Copyright © Intersil Corporation 2000

Typical Application

PGOOD

VID0
VID1
VID2
VID3
VID4

SS

OVP

RT

FB

D/A

+12V

MONITOR AND

PROTECTION

OSC

HIP6005

+

-

VCC

-

+

HIP6005

OCSET

BOOT

UGATE
PHASE

VIN = +5V OR +12V

+V

OUT

Block Diagram

VSEN

OCSET

VID0
VID1
VID2
VID3
VID4

FB

REFERENCE

D/A

CONVERTER

(DAC)

COMP

200µA

DACOUT

110%

90%

115%

VSEN

+

-

ERROR

AMP

GND

+

-

+

-

OVER-

VOLTAGE

+

-

+

-

OVER-

CURRENT

COMPARATOR

4V

PWM

POWER-ON

RESET (POR)

+

-

VCC

SOFT-

START

INHIBIT

PWM

GATE

CONTROL

LOGIC

PGOOD

10µA

OVP

SS
BOOT

UGATE
PHASE

COMP

RT

GND

OSCILLATOR

2

HIP6005

Absolute Maximum Ratings Thermal Information

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +15V

Boot Voltage, V

BOOT

- V

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

PHASE

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

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

Operating Conditions

Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . +12V ±10%

Ambient Temperature Range. . . . . . . . . . . . . . . . . . . . . 0oC to 70oC

Junction Temperature Range. . . . . . . . . . . . . . . . . . . .0oC to 125oC

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:

1. θJA is measured with the component mounted on a low effective thermal conductivity test board in free air. See Tech Brief 379 for details.

Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted

PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNITS

VCC SUPPLY CURRENT

Nominal Supply I

CC

POWER-ON RESET

Rising VCC Threshold V
Falling VCC Threshold V
Rising V

Threshold - 1.26 - V

OCSET

OSCILLATOR

Free Running Frequency RT = Open 185 200 215 kHz
Total Variation 6kΩ < RT to GND < 200kΩ -15 - +15 %
Ramp Amplitude ∆V

OSC

REFERENCE AND DAC

DACOUT Voltage Accuracy -1.0 - +1.0 %

ERROR AMPLIFIER

DC Gain -88- dB
Gain-Bandwidth Product GBW - 15 - MHz
Slew Rate SR COMP = 10pF - 6 - V/µs

GATE DRIVER

Upper Gate Source I
Upper Gate Sink

UGATE

R

UGATE

PROTECTION

Over-Voltage Trip (V
OCSET Current Source I
OVP Sourcing Current I
Soft Start Current I

/DACOUT) - 115 120 %

SEN

OCSETVOCSET

OVP

SS

POWER GOOD

Upper Threshold (VSEN / DACOUT) VSEN Rising 106 - 111 %
Lower Threshold (VSEN / DACOUT) VSEN Falling 89 - 94 %
Hysteresis (VSEN / DACOUT) Upper and Lower Threshold - 2 - %
PGOOD Voltage Low V

PGOODIPGOOD

UGATE Open - 5 - mA

OCSET
OCSET

RT = Open - 1.9 - V

V

- V

BOOT

V

= 5.5V; V

SEN

Thermal Resistance (Typical, Note 1) θJA (oC/W)

SOIC Package. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

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

Maximum Storage Temperature Range. . . . . . . . . . -65oC to 150oC

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

(SOIC - Lead Tips Only)

= 4.5V - - 10.4 V
= 4.5V 8.2 - - V

PHASE

= 12V, V

= 6V 350 500 - mA

UGATE

- 5.5 10 Ω

= 4.5V 170 200 230 µA

= 0V 60 - - mA

OVP

-10- µA

= -5mA - 0.5 - V

P-P

3

Typical Performance Curves

1000

100

RESISTANCE (kΩ)

10

RT PULLUP
TO +12V

RT PULLDOWN TO V

10 100 1000

SWITCHING FREQUENCY (kHz)

FIGURE 1. RT RESISTANCE vs FREQUENCY FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY

SS

HIP6005

40

35

C

= 3300pF

30

25

20

(mA)

CC

I

15

10

5

0

100 200 300 400 500 600 700 800 900 1000

UGATE

C

= 1000pF

UGATE

C

UGATE

SWITCHING FREQUENCY (kHz)

= 10pF

Functional Pin Description

1

V

SEN

OCSET

SS
VID0
VID1
VID2
VID3
VID4

COMP

FB

2
3
4
5
6
7
8
9

10

VSEN (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
upper MOSFET. R
(I

), and the upper MOSFET on-resistance (r

OCS

OCSET

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

I

•

I

PEAK

OCSROCSET

------------------------------------------- -=

r

DS ON()

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

) from this pin to the drain of the

OCSET

, an internal 200µA current source

SS (Pin 3)

Connect a capacitor from this pin to ground. This capacitor,
along with an internal 10µA current source, sets the soft­start interval of the converter.

20
19
18
17
16
15
14
13
12
11

R

T

OVP
V

CC

NC
NC
BOOT
UGATE
PHASE
PGOOD
GND

DS(ON)

) set

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.

4