1

®

FN9027.12

ISL6558

Multi-Purpose Precision Multi-Phase PWM

Controller With Optional Active Voltage

Positioning

The ISL6558 is a multi-phase PWM controller, which in

combination with the HIP6601B, HIP6602B, HIP6603B, or

ISL6605 companion gate drivers form a complete solution

for high-current, high slew-rate applications. The ISL6558

regulates output voltage, balances load currents and

provides protective functions for two to four synchronous

rectified buck converter channels.

A novel approach to current sensing is used to reduce

overall solution cost and improve efficiency. The voltage

developed across the lower MOSFET during conduction is

sampled and fed back to the controller. This lossless

current-sensing approach enables the controller to maintain

phase-current balance between the power channels, provide

overcurrent protection, and permit droop compensation.

Optional output voltage “droop” or active voltage positioning

is supported via the DROOP pin. Taking advantage of this

feature reduces the size and cost of the output capacitors

required to support a load transient.

In the event of an overvoltage, the controller monitors and

responds to reduce the risk of damage to load devices.

Undervoltage conditions are indicated through a PGOOD

transition. Overcurrent conditions cause the converter to

shutdown limiting the exposure of load devices. These

integrated monitoring and protection features provide a safe

environment for microprocessors and other advanced low

voltage circuits.

Features

•

Pb-Free Plus Anneal Available (RoHS Compliant)

• Multi-Phase Power Conversion

- 2-, 3-, or 4-Phase Operation

• Optional Output Voltage Droop

• Precision Channel-Current Balance

• Lossless Current Sensing

• Precision Reference Voltage

• Fast Transient Response

• Overcurrent and Overvoltage Protection

• Digital Soft-start

• Power Good Indication

• High Ripple Frequency (80kHz to 1.5MHz)

• QFN Package

- Compliant to JEDEC PUB95 MO-220 QFN-Quad Flat

No Leads-Product Outline

- Near Chip-Scale Package Footprint; Improves PCB

Efficiency and Thinner in Profile

Applications

• Power Supply Control for Microprocessors

• Low Output Voltage, High Current DC-DC Converters

• Voltage Regulator Modules

• Servers and Workstations

• Memory and Accelerated Graphics Port Supplies

• Communication Processor and Personal Computer

Peripherals

Pinouts

COMP

DROOP

FB

VSEN

PWM2

ISEN1

PWM1

ISEN2

N/C

ISEN3

1

2

3

4

5

67

89

10

15

14

13

12

11

20

19

18

17

16

9

10

11

12

13

14

16

15

8

7

6

5

4

3

2

1

PGOOD

COMP

DROOP

FB

VSEN

GND

FS/EN

PWM4

ISEN1

PWM1

PWM2

ISEN4

ISEN2

ISEN3

PWM3

ISL6558 (16 LEAD SOIC)

TOP VIEW

ISL6558 (20 LEAD 5X5 QFN)

TOP VIEW

Data Sheet

June 21, 2005

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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