intersil ISL6406, ISL6426 DATA SHEET

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ISL6406, ISL6426

Data Sheet November 1, 2004

Single Synchronous Buck Pulse-Width
Modulation (PWM) Controller

The ISL6406, ISL6426 is an adjustable frequency,
synchronous buck switching regulator optimized for
generating lower voltages for the distributed DC-DC
architectures. The ISL6406 offers an adjustable output
voltage, while the ISL6426 provides a fixed 1.8V output.

Designed to drive N-Channel MOSFETs in synchronous
buck topology, the ISL6406, ISL6426 integrates the control,
output adjustment and protection functions into a single
package.

The ISL6406, ISL6426 provides simple, single feedback
loop, voltage-mode control with fast transient response. The
output voltage can be precisely regulated to as low as 0.8V.
The error amplifier features a 15MHz gain-bandwidth
product and 6V/µs slew rate which enables high converter
bandwidth for fast transient performance.

Protection from overcurrent conditions is provided by
monitoring the r
operation appropriately. This approach simplifies the
implementation and improves efficiency by eliminating the
need for a current sense resistor.

The wide programmable switching frequency range of
100kHz to 700kHz allows the use of small surface mount
inductors and capacitors. The device also provides external
frequency synchronization making it an ideal choice for
DC-DC converter applications.

of the upper MOSFET to inhibit PWM

DS(ON)

FN9073.6

Features

• Operates from 3.3V/5V Input

• 0.8V to V

- 0.8V Internal Reference

- ±1.5% Reference Accuracy

• Simple Single-Loop Control Design

- Voltage-Mode PWM Control

• Fast Transient Response

- High-Bandwidth Error Amplifier

• Lossless, Programmable Overcurrent Protection

- Uses Upper MOSFET’s r

• Programmable Switching Frequency 100kHz–700kHz

• External Frequency Synchronization

• Two Device Options Available

- ISL6406 . . . . . . . . . . . . . . . . Adjustable Output Voltage

- ISL6426 . . . . . . . . . . . . . . . . . . . . . . Fixed 1.8V Output

• Internal Soft-Start

• QFN Package Option

- QFN Compliant to JEDEC PUB95 MO-220 QFN - Quad
Flat No Leads - Product Outline

- QFN Near Chip Scale Package Footprint; Improves
PCB Efficiency, Thinner in Profile

• Pb-Free Packaging Available (RoHS Compliant)

- Designated with “Z” Suffix (Refer to Note)

Output Range

IN

DS(on)

Applications

• 3V/5V DC-DC Converter Modules

• Distributed DC-DC 3.3V, 2.5V and 1.8V Power
Architectures for DSP, Logic, and Memory

• Power Supplies for Microprocessors

-PCs

- Embedded Controllers

• Memory Supplies

• Personal Computer Peripherals

1

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

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Copyright © Intersil Americas Inc. 2003-2004. All Rights Reserved

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

ISL6406, ISL6426

Pinouts

ISL6406, ISL6426 (SOIC/TSSOP)

TOP VIEW

16

15

14

13

12

11

10

9

UGATE

BOOT

PHASE

VCC

CPGND

COMP

VOUT

FB

GND

LGATE

CPVOUT

OCSET

CT1

CT2

RT

SYNC/EN

1

2

3

4

5

6

7

8

Ordering Information

TEMP. RANGE

PART NUMBER

(°C) PACKAGE

ISL6406CB 0 to 70 16 Ld SOIC M16.15

ISL6406CBZ
(See Note)

0 to 70 16 Ld SOIC

(Pb-free)

ISL6406IB -40 to 85 16 Ld SOIC M16.15

ISL6406IBZ
(See Note)

-40 to 85 16 Ld SOIC
(Pb-free)

ISL6406CR 0 to 70 16 Ld 5x5 QFN L16.5x5B

ISL6406CRZ
(See Note)

0 to 70 16 Ld 5x5 QFN

(Pb-free)

ISL6406IR -40 to 85 16 Ld 5x5 QFN L16.5x5B

ISL6406IRZ
(See Note)

-40 to 85 16 Ld 5x5 QFN
(Pb-free)

ISL6406CV 0 to 70 16 Ld TSSOP M16.173

ISL6406CVZ
(See Note)

0 to 70 16 Ld TSSOP

(Pb-free)

ISL6406IV -40 to 85 16 Ld TSSOP M16.173

ISL6406IVZ
(See Note)

-40 to 85 16 Ld TSSOP
(Pb-free)

ISL6426CB 0 to 70 16 Ld SOIC M16.15

ISL6426CBZ
(See Note)

0 to 70 16 Ld SOIC

(Pb-free)

ISL6426IB -40 to 85 16 Ld SOIC M16.15

ISL6426IBZ
(See Note)

-40 to 85 16 Ld SOIC
(Pb-free)

ISL6426CR 0 to 70 16 Ld 5x5 QFN L16.5x5B

ISL6426CRZ
(See Note)

0 to 70 16 Ld 5x5 QFN

(Pb-free)

ISL6426IR -40 to 85 16 Ld 5x5 QFN L16.5x5B

PKG.

DWG. #

M16.15

M16.15

L16.5x5B

L16.5x5B

M16.173

M16.173

M16.15

M16.15

L16.5x5B

ISL6406, ISL6426 (QFN)

TOP VIEW

LGATE

GND

UGATE

BOOT

1516 14 13

CPVOUT

OCSET

CT1

CT2

1

2

3

4

6578

RT

FB

SYNC/EN

PHASE

12

VCC

11

CPGND

10

COMP

9

VOUT

Ordering Information

TEMP. RANGE

PART NUMBER

ISL6426IRZ
(See Note)

(°C) PACKAGE

-40 to 85 16 Ld 5x5 QFN
(Pb-free)

ISL6426CV 0 to 70 16 Ld TSSOP M16.173

ISL6426CVZ
(See Note)

0 to 70 16 Ld TSSOP

(Pb-free)

ISL6426IV -40 to 85 16 Ld TSSOP M16.173

ISL6426IVZ
(See Note)

-40 to 85 16 Ld TSSOP
(Pb-free)

Add “-T” suffix to part number for tape and reel packaging.

NOTE: Intersil Pb-free 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-020C.

PKG.

DWG. #

L16.5x5B

M16.173

M16.173

2

Functional Block Diagram

VCC

ISL6406, ISL6426

CPVOUT

CT1

CT2

CPGND

OCSET

FB

VOUT

COMP

0.8V

20µA

+

-

CHARGE

PUMP

ERROR

AMP

+

-

COMPARATOR

+

-

SYNC/EN

SDWN

OC

PWM

COMPARATOR

+

-

OSCILLATOR

SDWN

RT

POWER-ON

RESET (POR)

SOFTSTART

INHIBIT

PWM

GATE

CONTROL

LOGIC

GND

BOOT

UGATE

PHASE

LGATE

3

ISL6406, ISL6426

Typical Application Schematic for 5V Input

V

IN

5V ±10%

C

IN

VCC

CT1

OCSET

R

OCSET

C

BULK

NC

CT2

CPVOUT

ISL6406, ISL6426

RT

CPGND

R

T

GND

BOOT

UGATE

PHASE

VCC

VOUT

SYNC/EN

LGATE

FBCOMP

C

I

C

R

F

F

R

OFFSET

Typical Application Schematic for 3.3V Input

V

IN

3.3V ±10%

R

T

VCC

C

C

PUMP

IN

VCC

CT1

OCSET

CPVOUT

CT2

ISL6406, ISL6426

RT

CPGND

GND

BOOT

UGATE

PHASE

VOUT

SYNC/EN

LGATE

FBCOMP

D

BOOT

C

BOOT

D

C

BOOT

BOOT

C

DCPL

C

R

BOOT

R

FB

R

OCSET

C

DCPL

R

BOOT

HF

Q

1

L

OUT

C

C

C

BULK

HF

L

OUT

OUT

C

OUT

Q

2

Q

1

Q

2

V

OUT

V

OUT

C

I

R

FB

C

R

F

F

R

OFFSET

4

ISL6406, ISL6426

Absolute Maximum Ratings Thermal Information

Supply Voltage, VCC (Note 1) . . . . . . . . . . . . . . . . . . . . . . . . . +7.0V

Absolute Boot Voltage, V
Upper Driver Supply Voltage, V

. . . . . . . . . . . . . . . . . . . . . . . +15.0V

BOOT

BOOT

- V

. . . . . . . . . . . +6.0V

PHASE

Input, Output or I/O Voltage. . . . . . . . . . . GND -0.3V to VCC +0.3V

ESD Classification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Class 2

Operating Conditions

Temperature Range

ISL6406, ISL6426C . . . . . . . . . . . . . . . . . . . . . . . . . . 0°C to 70°C

ISL6406, ISL6426I . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C

Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V ±10%

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the
device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1. Please refer to the Typical Application Schematics (page 3) for 3.3V / 5V input configuration.

is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.

2. θ

JA

is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See

3. θ

JA

Tech Brief TB379.

4. For θ

, the “case temp” location is the center of the exposed metal pad on the package underside.

JC

Thermal Resistance (Typical) θ

(°C/W) θJC (°C/W)

JA

SOIC (Note 2) . . . . . . . . . . . . . . . . . . . 70 N/A

TSSOP (Note 2) . . . . . . . . . . . . . . . . . . 90 N/A

QFN (Notes 3, 4) . . . . . . . . . . . . . . . . . 35 4.5

Maximum Junction Temperature (Plastic Package) . . -55°C to 150°C

Maximum Storage Temperature Range. . . . . . . . . . . -65°C to 150°C

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300°C

(SOIC - Lead Tips Only)

Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application

Schematic. V

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

SUPPLY

V

CC

Shutdown Supply Current SYNC/EN = GND - 20 50 µA

Operating Supply Current (Note 5) RT = 64.9kΩ 7 9.8 11.5 mA

REFERENCE VOLTAGE

Nominal Reference Voltage -0.8- V

Reference Voltage Tolerance -1.5 - 1.5 %

ERROR AMPLIFIER

Open Loop Voltage Gain (Note 6) - 82 - dB

Gain-Bandwidth Product (Note 6) 14 - - MHz

Slew Rate (Note 5) COMP = 10pF 4.65 6.0 9.2 V/µs

CHARGE PUMP

Nominal Charge Pump Output V

Charge Pump Output Regulation -5.0 - 5.0 %

POWER-ON RESET

Rising CPVOUT POR Threshold T

CPVOUT POR Threshold Hysteresis 0.3 0.5 0.9 V

OSCILLATOR

Gate Output Frequency Range RT = 200kΩ 80 100 120 kHz

Sawtooth Amplitude Peak-to-Peak ∆V

= +3.3V. Typical values are at TA = 25°C.

CC

= 0°C to 70°C -1.8 - 1.8 %

T

A

= -40°C to +85°C -2.1 - 2.1 %

T

A

= 3.3V, No Load 4.8 5.1 5.5 V

CC

= 0°C to 70°C 4.20 4.35 4.5 V

A

= -40°C to +85°C 4.1 4.35 4.6 V

T

A

RT = 64.9kΩ 250 300 340 kHz

RT = 26.1kΩ 650 715 770 kHz

OSC

1.1 1.4 1.7 V

5

ISL6406, ISL6426

Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application

Schematic. V

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Sync. Frequency Range (Note 6) 1.1 Times the natural switching

Minimum Sync Pulse Width (Note 6) - 40 100 ns

PWM Maximum Duty Cycle -96-%

GATE DRIVER OUTPUT (Note 6)

Upper Gate Source Current V

Upper Gate Sink Current -1-A

Lower Gate Source Current V

Lower Gate Sink Current -2-A

SOFT-START

Soft-Start Slew Rate f = 300kHz, T

OVERCURRENT

OCSET Current Source T

NOTES:

5. This is the V

current consumed when the device is active but not switching.

CC

6. Guaranteed by design.

= +3.3V. Typical values are at TA = 25°C. (Continued)

CC

frequency.

- V

BOOT

= 3.3V, V

VCC

f = 300kHz, T

= 5V, V

PHASE

= 4V - -1 - A

LGATE

= 0°C to 70°C 6.2 6.7 7.3 ms

A

= -40°C to +85°C 6.2 6.7 7.6 ms

A

= 4V - -1 - A

UGATE

Internal Digital Circuit Clock Count
(Soft-start time varies with frequency)

= 0°C to 70°C 18 20 22 µA

A

T

= -40°C to +85°C 162023µA

A

110 - 770 kHz

- 2048 - Clk Cycles

Typical Performance Curve

0.81

0.805

0.8

(V)

0.795

REF

V

0.79

0.785

0.78

-40-30-20-10 0 1020304050607080

TEMPERATURE (°C)

FIGURE 1. REFERENCE VOLTAGE vs TEMPERATURE

6