ISL6562 Datasheet, PDF(2/5 Page) Intersil Corporation – Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller

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ISL6562 Datasheet, PDF (2/5 Pages) Intersil Corporation – Microprocessor CORE Voltage Regulator Two-Phase Buck PWM Controller

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Block Diagram

PWRGD

VID3

VID2

VID1

VID0

VID25mV

COMP

ISL6562

REF

VCC

3V REFERENCE

UVLO and

BIAS CIRCUITS

X 0.82

X1.24

OVP

OSCILLATOR

CONTROL

LOGIC

PWM1

PWM2

E/A

D/A

CMP

CS+

CS-

GND

Simpliï¬ed Power System Diagram

ISL6562

PWM 1

SYNCHRONOUS

RECTIFIED BUCK

CHANNEL

PWM 2 SYNCHRONOUS

RECTIFIED BUCK

CHANNEL

VID

MICROPROCESSOR

Functional Pin Description

VID3 1

VID2 2

VID1 3

VID0 4

VID25mV 5

COMP 6

FB 7

CT 8

16 VCC

15 REF

14 CS-

13 PWM1

12 PWM2

11 CS+

10 PWRGD

9 GND

VID3 (Pin 1), VID2 (Pin 2), VID1 (Pin 3), VID0 (Pin 4)

and VID25mV (Pin 5)

Voltage Identification inputs from microprocessor. These pins

respond to TTL and 3.3V logic signals. The ISL6562 decodes

VID bits to establish the output voltage. See Table 1.

COMP (Pin 6)

Output of the internal transconductance error ampliï¬er.

Voltage at this terminal sets the output current level of the

Current Sense Comparator. Pulling this pin to ground

disables the oscillator and drives both PWM outputs low.

FB (Pin 7)

Inverting input of the internal transconductance error

ampliï¬er.

CT (Pin 8)

A capacitor on this terminal sets the frequency of the internal

oscillator.

GND (Pin 9)

Bias and reference ground. All signals are referenced to this

pin.

PWRGD (Pin 10)

Open drain connection. A high voltage level at this pin with a

resistor connected to this terminal and VCC indicates that

CORE voltage is at the proper level,

CS+ (Pin 11) and CS- (Pin 14) These inputs monitor the

supply current to the converter positive input voltage. CS+ is

connected directly to the decoupled supply voltage and

current sampling resistor. CS- is connected to the other end

of the current sampling resistor and the upper drains of the

series transistors.

PWM2 (Pin 12) and PWM1 (Pin 13)

PWM outputs connected to the gate driver ICs.

REF (Pin 15)

Three volt supply used to bias the output of the

transconductance ampliï¬er.

VCC (Pin 16)

Bias supply. Connect this pin to a 12V supply.

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