intersil ISL6840, ISL6841, ISL6842, ISL6843, ISL6844 DATA SHEET

...

www.BDTIC.com/Intersil

ISL6840, ISL6841, ISL6842,

ISL6843, ISL6844, ISL6845

Data Sheet November 12, 2007

Improved Industry Standard Single-Ended Current Mode PWM Controller

The ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845 family of adjustable frequency, low power, pulse width modulating (PWM) current mode controllers is designed for a wide range of power conversion applications including boost, flyback, and isolated output configurations. Peak current mode control effectively handles power transients and provides inherent overcurrent protection.

This advanced BiCMOS design is pin compatible with the industry standard 384x family of controllers and offers significantly improved performance. Features include low operating current, 60µA start-up current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times.

PART NUMBER RISING UVLO (V) MAX. DUTY CYCLE (%)

ISL6840 7.0 100 ISL6841 7.0 50 ISL6842 14.4 100 ISL6843 8.4 100 ISL6844 14.4 50 ISL6845 8.4 50

FN9124.9

Features

• 1A MOSFET gate driver

• 60µA start-up current, 100µA maximum

• 25ns propagation delay current sense to output

• Fast transient response with peak current mode control

• Adjustable switching frequency to 2MHz

• 20ns rise and fall times with 1nF output load

• Trimmed timing capacitor discharge current for accurate deadtime/maximum duty cycle control

• High bandwidth error amplifier

• Tight tolerance voltage reference over line, load, and temperature

• Tight tolerance current limit threshold

• Pb-free available (RoHS Compliant)

Applications

• Telecom and Datacom Power

• Wireless Base Station Power

• File Server Power

• Industrial Power Systems

• PC Power Supplies

• Isolated Buck and Flyback Regulators

• Boost Regulators

Pinout

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

COMP

RTCT

8 LD SOIC, MSOP

COMP

1 2

RTCT

3 4

TOP VIEW

8 LD DFN

TOP VIEW

8 7

8 7 6 5

VREF VDD OUT GND

VREF VDD

OUT GND

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

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

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

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

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

www.BDTIC.com/Intersil

Ordering Information

PART NUMBER PART MARKING TEMP RANGE (°C) PACKAGE PKG. DWG. #

ISL6840IB* ISL 6840IB -40 to +105 8 Ld SOIC M8.15 ISL6840IBZ* (Note) 6840 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6840IRZ-T† (Note) 40Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6840IU* 6840 -40 to +105 8 Ld MSOP M8.118 ISL6840IUZ* (Note) 6840Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6841IB* ISL 6841IB -40 to +105 8 Ld SOIC M8.15 ISL6841IBZ* (Note) 6841 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6841IRZ-T† (Note) 41Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6841IU* 6841 -40 to +105 8 Ld MSOP M8.118 ISL6841IUZ* (Note) 6841Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6842IB* ISL 6842IB -40 to +105 8 Ld SOIC M8.15 ISL6842IBZ* (Note) 6842 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6842IRZ-T† (Note) 42Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6842IU* 6842 -40 to +105 8 Ld MSOP M8.118 ISL6842IUZ* (Note) 6842Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6843IB* ISL 6843IB -40 to +105 8 Ld SOIC M8.15 ISL6843IBZ* (Note) 6843 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6843IRZ-T† (Note) 43Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6843IU* 6843 -40 to +105 8 Ld MSOP M8.118 ISL6843IUZ* (Note) 6843Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6844IB* ISL 6844IB -40 to +105 8 Ld SOIC M8.15 ISL6844IBZ* (Note) 6844 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6844IRZ-T† (Note) 44Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6844IU* 6844 -40 to +105 8 Ld MSOP M8.118 ISL6844IUZ (Note) 6844Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 ISL6845IB* ISL 6845IB -40 to +105 8 Ld SOIC M8.15 ISL6845IBZ* (Note) 6845 IBZ -40 to +105 8 Ld SOIC (Pb-free) M8.15 ISL6845IRZ-T† (Note) 45Z -40 to +105 8 Ld 2x3 DFN (Pb-free) L8.2x3 ISL6845IU* 6845 -40 to +105 8 Ld MSOP M8.118 ISL6845IUZ* (Note) 6845Z -40 to +105 8 Ld MSOP (Pb-free) M8.118 *Add “-T” suffix for tape and reel. Please refer to TB347 for details on reel specifications.

†Contact Factory for Availability NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets; molding compounds/die attach materials and 100% matte tin plate PLUS ANNEAL - e3 termination finish, which is 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.

FN9124.9

November 12, 2007

Functional Block Diagram

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VDD

UVLO

COMPARATOR

100mV

ENABLE

GND

COMP

VREF

2.5V

ERROR

AMPLIFIER

A = 0.5

REF

5.00V

PWM

COMPARATOR

1.1V

CLAMP

ISL6841/ISL6844/ISL6845 ONLY

SRQ

VREF FAULT

VREF

UV COMPARATOR

4.65V 4.80V

VREF

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

OUT

2.6V

0.7V

OSCILLATOR

COMPARATOR

RTCT

November 12, 2007

FN9124.9

8.4mA

CLOCK

P/N

-40, -41 7.0/6.6V

-42, -44 14.3/8.8V

-43, -45

RESET

DOMINANT

UVLO ON/OFF

8.4/7.2V

Typical Application - 48V Input Dual Output Flyback

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VIN+

36V TO 75V

CR6

CR2

C17

R21

CR5

CR4

C19

C21

R16

C15 C16

C22

C20

R17

R19

C14

R18

+3.3V

+1.8V

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

RETURN

VIN-

CR1

VR1

November 12, 2007

FN9124.9

R26

R22

COMP CS

FB RTCT

ISL684x

R10

R27

VREF

OUT

GND

R13

C13

R15

R20

C12

C11

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