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HIP6004D

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

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HIP6004D

Electrical Specifications Recommended Operating Conditions, Unless Otherwise Noted (Continued)

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

POWER GOOD

Upper Threshold (VSEN/DACOUT)

VSEN Rising

106

Lower Threshold (VSEN/DACOUT)

VSEN Falling

89

Hysteresis (VSEN/DACOUT)

Upper and Lower Threshold

-

PGOOD Voltage Low

VPGOOD IPGOOD = -5mA

-

TYP MAX

-

111

-

94

2

-

0.5

-

UNITS

%

%

%

V

Typical Performance Curves

1000

100

RT PULLUP

TO +12V

10

RT PULLDOWN TO VSS

10

100

SWITCHING FREQUENCY (kHz)

FIGURE 1. RT RESISTANCE vs FREQUENCY

1000

80

70

CGATE = 3300pF

60

CUPPER = CLOWER = CGATE

50

40

CGATE = 1000pF

30

20

10

CGATE = 10pF

0

100 200 300 400 500 600 700 800 900 1000

SWITCHING FREQUENCY (kHz)

FIGURE 2. BIAS SUPPLY CURRENT vs FREQUENCY

Functional Pin Descriptions

VSEN 1

OCSET 2

SS 3

VID0 4

VID1 5

VID2 6

VID3 7

VID4 8

COMP 9

FB 10

20 RT

19 OVP

18 VCC

17 LGATE

16 PGND

15 BOOT

14 UGATE

13 PHASE

12 PGOOD

11 GND

VSEN (Pin 1)

This pin is connected to the converter’s 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 (ROCSET) from this pin to the drain of the

upper MOSFET. ROCSET, an internal 200µA current source

(IOCS), and the upper MOSFET on-resistance (rDS(ON)) set

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

following equation:

IPEAK

=

I--O-----C----S----E----T-----x-----R-----O----C-----S---E----T--

rDS(ON)

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 10µA 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 all 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.

5

FN4855.3

July 13, 2005

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