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HIP6020

Advanced Dual PWM and Dual Linear Power Controller

Intersil 

HIP6020

SS (Pin 12)

Connect a capacitor from this pin to ground. This capacitor,

along with an internal 28µA current source, sets the

soft-start interval of the converter.

FAULT / RT (Pin 13)

This pin provides oscillator switching frequency adjustment.

By placing a resistor (RT) from this pin to GND, the nominal

200kHz switching frequency is increased according to the

following equation:

Fs ≈ 200KHz + -R5----T-×---(--1k---0-Ω---6--)

(RT to GND)

Conversely, connecting a pull-up resistor (RT) from this pin

to VCC reduces the switching frequency according to the

following equation:

Fs ≈ 200KHz – R-4----T-×---(--1k---0-Ω---7--)

(RT to 12V)

Nominally, the voltage at this pin is 1.26V. In the event of an

over-voltage or over-current condition, this pin is internally

pulled to VCC.

PGOOD (Pin 8)

PGOOD is an open collector output used to indicate the

status of the output voltages. This pin is pulled low when the

synchronous regulator output is not within ±10% of the

DACOUT reference voltage or when any of the other outputs

are below their under-voltage thresholds.

The PGOOD output is open for ‘11111’ VID code.

VID0, VID1, VID2, VID3, VID4 (Pins 7, 6, 5, 4 and 3)

VID0-4 are the TTL-compatible input pins to the 5-bit DAC.

The logic states of these five pins program the internal

voltage reference (DACOUT). The level of DACOUT sets the

microprocessor core converter output voltage, as well as the

coresponding PGOOD and OVP thresholds.

OCSET1, OCSET2 (Pins 23 and 9)

Connect a resistor (ROCSET) from this pin to the drain of the

respective upper MOSFET. ROCSET, an internal 200µA

current source (IOCSET), and the upper MOSFET’s on-

resistance (rDS(ON)) set the converter over-current (OC) trip

point according to the following equation:

IPEAK = I--O-----C----S----Er--D--T---S--×--(--OR----N-O---)--C----S----E----T-

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

The voltage at OCSET1 pin is monitored for power-on reset

(POR) purposes.

PHASE1, PHASE2 (Pins 26 and 2)

Connect the PHASE pins to the respective PWM converter’s

upper MOSFET source. These pins represent the gate drive

return current path and are used to monitor the voltage drop

across the upper MOSFETs for over-current protection.

UGATE1, UGATE2 (Pins 27 and 1)

Connect UGATE pins to the respective PWM converter’s

upper MOSFET gate. These pins provide the gate drive for

the upper MOSFETs.

LGATE1 (Pin 25)

Connect LGATE1 to the synchronous PWM converter’s

lower MOSFET gate. This pin provides the gate drive for the

lower MOSFET.

COMP1 and FB1 (Pins 20, and 21)

COMP1 and FB1 are the available external pins of the

synchronous PWM regulator error amplifier. The FB1 pin is

the inverting input of the error amplifier. Similarly, the

COMP1 pin is the error amplifier output. These pins are

used to compensate the voltage-mode control feedback loop

of the synchronous PWM converter.

VSEN1 (Pin 22)

This pin is connected to the synchronous PWM converters’

output voltage. The PGOOD and OVP comparator circuits

use this signal to report output voltage status and for over-

voltage protection.

VSEN2 (Pin 10)

Connect this pin to the output of the standard buck PWM

regulator. The voltage at this pin is regulated to the level

predetermined by the logic-level status of the SELECT pin.

This pin is also monitored by the PGOOD comparator circuit.

SELECT (Pin 11)

This pin determines the output voltage of the AGP bus

switching regulator. A low TTL input sets the output voltage

to 1.5V, while a high input sets the output voltage to 3.3V.

DRIVE3 (Pin 18)

Connect this pin to the gate of an external MOSFET. This pin

provides the drive for the 1.5V regulator’s pass transistor.

VSEN3 (Pin 19)

Connect this pin to the output of the 1.5V linear regulator.

This pin is monitored for undervoltage events.

DRIVE4 (Pin 15)

Connect this pin to the gate of an external MOSFET. This pin

provides the drive for the 1.8V regulator’s pass transistor.

VSEN4 (Pin 14)

Connect this pin to the output of the linear 1.8V regulator.

This pin is monitored for undervoltage events.

Description

Operation

The HIP6020 monitors and precisely controls 4 output voltage

levels (Refer to Figures 1, 2, and 3). It is designed for

microprocessor computer applications with 3.3V, 5V, and 12V

bias input from an ATX power supply. The IC has 2 PWM and

2-286

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