ISL6554CBZA データシートの表示（PDF） - Renesas Electronics

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ISL6554CBZA

Microprocessor CORE Voltage Regulator Using Multi-Phase Buck PWM Control Without Programmable Droop

Renesas Electronics 

ISL6554

Simplified Power System Diagram

VSEN

PWM 1

PWM 2

ISL6554

PWM 3

PWM 4

VID

SYNCHRONOUS

RECTIFIED BUCK

CHANNEL

SYNCHRONOUS

RECTIFIED BUCK

CHANNEL

SYNCHRONOUS

RECTIFIED BUCK

CHANNEL

SYNCHRONOUS

RECTIFIED BUCK

CHANNEL

MICROPROCESSOR

Functional Pin Description

VID4 1

VID3 2

VID2 3

VID1 4

VID0 5

COMP 6

FB 7

FS/DIS 8

GND 9

VSEN 10

20 VCC

19 PGOOD

18 PWM4

17 ISEN4

16 ISEN1

15 PWM1

14 PWM2

13 ISEN2

12 ISEN3

11 PWM3

VID4 (Pin 1), VID3 (Pin 2), VID2 (Pin 3), VID1 (Pin 4)

and VID0 (Pin 5)

Voltage Identification inputs from microprocessor. These

pins respond to TTL and 3.3V logic signals. The ISL6554

decodes VID bits to establish the output voltage. See

Table 1.

COMP (Pin 6)

Output of the internal error amplifier. Connect this pin to the

external feedback and compensation network.

FB (Pin 7)

Inverting input of the internal error amplifier.

FS/DIS (Pin 8)

Channel frequency, FSW, select and disable. A resistor from

this pin to ground sets the switching frequency of the

FN9003 Rev 3.00

February 11, 2005

converter. Pulling this pin to ground disables the converter

and three states the PWM outputs. See Figure 10.

GND (Pin 9)

Bias and reference ground. All signals are referenced to this

pin.

VSEN (Pin 10)

Power good monitor input. Connect to the microprocessor-

CORE voltage.

PWM1 (Pin 15), PWM2 (Pin 14), PWM3 (Pin 11) and

PWM4 (Pin 18)

PWM outputs for each driven channel in use. Connect these

pins to the PWM input of an HIP6601/2/3 driver. For systems

which use 3 channels, connect PWM4 high. Two channel

systems connect PWM3 and PWM4 high.

ISEN1 (Pin 16), ISEN2 (Pin 13), ISEN3 (Pin 12) and

ISEN4 (Pin 17)

Current sense inputs from the individual converter channel’s

phase nodes. Unused sense lines MUST be left open.

PGOOD (Pin 19)

Power good. This pin provides a logic-high signal when the

microprocessor CORE voltage is within specified limits and

soft-start has timed out.

VCC (Pin 20)

Bias supply. Connect this pin to a 5V supply.

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