215

SS (Pin 12)

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

along with an internal 11

µA current source, sets the soft-

start interval of the converter.

Pulling this pin low with an open drain signal will shutdown

the IC.

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

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 core converter output voltage.

It also sets the core PGOOD and OVP thresholds.

COMP1 and FB1 (Pins 20, and 21)

COMP1 and FB1 are the available external pins of the PWM

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-

control feedback loop of the PWM converter.

GND and GND2 (Pins 17 and 9)

Signal grounds for the IC. All voltage levels are measured

with respect to these pins.

PGOOD (Pin 8)

PGOOD is an open collector output used to indicate the

status of the PWM converter output voltages. This pin is

pulled low when the core output is not within

±10% of the

DACOUT reference voltage and the other outputs are below

their under-voltage thresholds. The PGOOD output is open

for VID codes that inhibit operation. See Table 1.

PHASE1 (Pin 26)

Connect the PHASE pin to the PWM converter’s upper

MOSFET source. This pin is used to monitor the voltage

drop across the upper MOSFET for over-current protection.

UGATE1 (Pin 27)

Connect UGATE pin to the PWM converter’s upper

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

MOSFET.

PGND (Pin 24)

This is the power ground connection. Tie the synchronous

PWM converter’s lower MOSFET source to this pin.

LGATE1 (Pin 25)

Connect LGATE1 to the synchronous PWM converter’s

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

lower MOSFET.

VCC (Pin 28)

Provide a 12V bias supply for the IC to this pin. This pin also

provides the gate charge for all the MOSFETs controlled by

the IC.

FAULT/RT (Pin 13)

This pin provides oscillator switching frequency adjustment.

200kHz switching frequency is increased according to the

following equation:

to VCC reduces the switching frequency according to the

following equation:

Nominally, this pin voltage is 1.26V, but is pulled to VCC in

the event of an over-voltage or over-current condition.

GATE3 (Pin 18)

Connect this pin to the gate of an external MOSFET or the

base of an external bipolar NPN transistor. This pin provides

the drive for the linear controller’s pass transistor.

FB3 (Pin 19)

Connect this pin to a resistor divider to set the linear

controller output voltage.

VOUT2 (Pin 16)

Output of the linear regulator. Supplies current up to 230mA.

FB2 (Pin 14)

Connect this pin to a resistor divider to set the linear

regulator output.

VIN2 (Pin 15)

VIN2 provides the input power to the integrated linear

regulator. Connect this pin to the 3.3VDC supply. This pin is

also monitored for UV events.

V33 (Pin 10)

Connect this pin to the 3.3VDC supply.

Description

Operation

The HIP6017 monitors and precisely controls 3 output

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

for microprocessor computer applications with 3.3V and 5V

power and 12V bias input from an ATX power supply. The IC

has one PWM controller, a linear controller, and a linear

regulator. The PWM controller (PWM) is designed to

controller drives 2 MOSFETs (Q1 and Q2) in a synchronous-

rectified buck converter configuration and regulates the core

voltage to a level programmed by the 5-bit digital-to-analog

converter (DAC). An integrated linear regulator supplies the

Fs

200kH z

5x10

6

R

()

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

+

≈

Fs

200kH z

4x10

7

R

()

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

–

≈

HIP6017