ISL6528CB-T Intersil, ISL6528CB-T Datasheet

ISL6528CB-T

Manufacturer Part Number

ISL6528CB-T

Description

IC CNTRLR PWR PWM BUCK 8-SOIC

Manufacturer

Intersil

Datasheet

1.ISL6528CBZ-T.pdf (13 pages)

Specifications of ISL6528CB-T

Pwm Type

Voltage Mode

Number Of Outputs

Frequency - Max

650kHz

Duty Cycle

100%

Voltage - Supply

4.5 V ~ 5.5 V

Buck

Yes

Boost

Flyback

Inverting

Doubler

Divider

Cuk

Isolated

Operating Temperature

0°C ~ 70°C

Package / Case

8-SOIC (3.9mm Width)

Frequency-max

650kHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Other names

ISL6528CB-TR

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

ISL6528CB-T

Manufacturer:

INTERSIL

Quantity:

20 000

Current page: 1 of 13
Download datasheet (362Kb)

Dual Regulator - Standard Buck PWM

and Linear Power Controller

The ISL6528 provides the power control and protection for

two output voltages in high-performance graphics cards and

other embedded processor applications. The dual-output

controller drives an N-Channel MOSFET in a standard buck

topology and a NPN pass transistor in a linear configuration.

The ISL6528 provides both a regulated high current, low

voltage supply and an independent, lower current supply

integrated in an 8-lead SOIC package. The controller is ideal

for graphics card applications where both graphics

processing unit (GPU) and memory supplies are required.

The standard buck converter is a simple, single feedback

loop, voltage-mode control with fast transient response. Both

the switching regulator and linear regulator provide a

maximum static regulation tolerance of ±2% over line, load,

and temperature ranges. Each output is user-adjustable by

means of external resistors.

An integrated soft-start feature brings both supplies into

regulation in a controlled manner. Each output is monitored

via the FB pins for undervoltage events. If either output

drops below 52.5% of the internal reference voltage, both

regulators are shutdown.

Ordering Information

NOTE: Intersil Pb-free plus anneal products employ special Pb-free

material sets; molding compounds/die attach materials and 100%

matte tin plate termination finish, which are RoHS compliant and

compatible with both SnPb and Pb-free soldering operations. Intersil

Pb-free products are MSL classified at Pb-free peak reflow

temperatures that meet or exceed the Pb-free requirements of

IPC/JEDEC J STD-020.

ISL6528CB

ISL6528CB-T

ISL6528CBZ

(See Note)

ISL6528CBZ-T

(See Note)

ISL6528EVAL1

NUMBER

PART

ISL6528CB

ISL6528CB 8Ld SOIC Tape and Reel

6528CBZ

MARKING

PART

8Ld SOIC Tape and Reel (Pb-free)

Evaluation Board

RANGE (°C) PACKAGE

TEMP.

0 to 70

Data Sheet

8 Ld SOIC

(Pb-free)

M8.15

DWG. #

PKG.

1-888-INTERSIL or 1-888-468-3774

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

Features

• Pb-free plus anneal available (RoHS compliant)

• Provides two regulated voltages

• Small converter size

• Excellent output voltage regulation

• Single 5V bias and bootstrap supply

• Output voltage range: 0.8V to 3.3V

• Simple single-loop voltage-mode PWM control design

• Fast PWM converter transient response

• Linear controller drives bipolar linear pass transistor

• Fully-adjustable outputs

• Undervoltage fault monitoring on both outputs

Applications

• Graphics–GPU and memory supplies

• ASIC power supplies

• Embedded processor and I/O supplies

• DSP supplies

Related Literature

• Technical Brief TB363 Guidelines for Handling and

Pinout

- One standard buck PWM

- One linear controller

- 600kHz constant frequency operation

- Small external component count

- Both outputs: ±2% over temperature

- High-bandwidth error amplifier

- Full 0–100% duty ratio

Processing Moisture Sensitive Surface Mount Devices

(SMDs)

All other trademarks mentioned are the property of their respective owners.

March 9, 2006

Intersil (and design) is a registered trademark of Intersil Americas Inc.

DRIVE2

GND

VCC

FB2

TOP VIEW

ISL6528

(SOIC)

UGATE

BOOT

COMP

ISL6528

FN9038.4

Related parts for ISL6528CB-T

ISL6528CB-T Summary of contents

Page 1

... Ordering Information PART PART TEMP. NUMBER MARKING RANGE (°C) PACKAGE ISL6528CB ISL6528CB ISL6528CB-T ISL6528CB 8Ld SOIC Tape and Reel ISL6528CBZ 6528CBZ (See Note) ISL6528CBZ-T 6528CBZ 8Ld SOIC Tape and Reel (Pb-free) (See Note) ISL6528EVAL1 Evaluation Board NOTE: Intersil Pb-free plus anneal products employ special Pb-free material sets ...

Page 2

Block Diagram VOLTAGE REFERENCE INHIBIT/SOFT-START FB2 EA2 DRIVE2 INHIBIT SOFT-START GND OSCILLATOR RESTART SHUTDOWN SOFT- START AND FAULT LOGIC INHIBIT SOFT-START PWM UV2 EA1 COMP1 UV1 FB COMP VCC POWER-ON RESET (POR) BOOT DRIVE1 UGATE ...

Page 3

Simplified Power System Diagram +5V +3.3V V OUT2 + Typical Application +5V +3. OUT2 2. OUT2 3 ISL6528 Q2 LINEAR CONTROLLER ISL6528 + VCC DRIVE2 FB2 ISL6528 GND Q1 PWM CONTROLLER + ...

Page 4

Absolute Maximum Ratings UGATE, BOOT GND -0.3V to +10V VCC . . . . . ...

Page 5

Functional Pin Descriptions GND 1 VCC 2 DRIVE2 3 FB2 4 GND (Pin 1) Signal ground for the IC. All voltage levels are measured with respect to this pin. Place via close to pin to minimize impedance path to ground ...

Page 6

FET DRAIN) 0V (1V/DIV) V OUT2 V OUT1 0V (0.5V/DIV TIME FIGURE 1. SOFT-START INTERVAL shuts down both regulators simultaneously when the fault signal triggers a restart. Figure 2 illustrates the protection feature ...

Page 7

IN DRIVE2 Q2 V OUT2 FB2 OUT2 R5   × 0 ------- -   OUT2 R6 FIGURE 4. OUTPUT VOLTAGE SELECTION OF THE LINEAR The linear regulator output voltage ...

Page 8

Compensation Break Frequency Equations Poles ------------------------------------------------------ - P1 ×   × × 2π R --------------------- -   ----------------------------------- P2 × × 2π Zeros: ...

Page 9

VCC VCC GND BOOT C BOOT Q1 UGATE PHASE ISL6528 COMP DRIVE2 R5 FB2 R6 KEY ISLAND ON POWER PLANE LAYER ISLAND ...

Page 10

One of the parameters limiting the converter’s response to a load transient is the time required to slew the inductor current. Given a sufficiently fast control loop design, ...

Page 11

The main criteria for selection of the linear regulator pass transistor is package selection for efficient removal of heat. Select a package and heatsink that maintains the ...

Page 12

ISL6528 Converter Application Circuit Figure 9 shows a typical DC/DC converter circuit for a graphics card application. Additional information on this circuit can be obtained by referencing application note AN9982. +3. 330µF 330µF 1µF Q2 VOUT2 (1A) R5 ...

Page 13

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use ...

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