FN9124.6

ISL6840, ISL6841, ISL6842,

ISL6843, ISL6844, ISL6845

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, 60

µA start-up current, adjustable

operating frequency to 2MHz, and high peak current drive
capability with 20ns rise and fall times.

Features

· 1A MOSFET gate driver

· 60

µA startup 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 Plus Anneal 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

8-PIN SOIC, MSOP

TOP VIEW

DFN 8 LEAD

TOP VIEW

PART NUMBER

RISING UVLO

MAX. DUTY CYCLE

ISL6840

7.0

100%

ISL6841

7.0

50%

ISL6842

14.4V

100%

ISL6843

8.4V

100%

ISL6844

14.4V

50%

ISL6845

8.4V

50%

COMP

RTCT

VREF

VDD

OUT

GND

COMP

RTCT

VREF

VDD

OUT

GND

Data Sheet

June 28, 2005

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.

FN9124.6

June 28, 2005

Ordering Information

PART NUMBER

TEMP. RANGE

(°C)

PACKAGE

PKG.

DWG. #

ISL6840IB

-40 to 105

8 Ld SOIC

M8.15

ISL6840IBZ
(See Note)

-40 to 105

8 Ld SOIC
(Pb-free)

M8.15

ISL6840IU

-40 to 105

8 Ld MSOP

M8.118

ISL6840IUZ
(See Note)

-40 to 105

8 Ld MSOP
(Pb-free)

M8.118

ISL6841IB

-40 to 105

8 Ld SOIC

M8.15

ISL6841IBZ
(See Note)

-40 to 105

8 Ld SOIC
(Pb-free)

M8.15

ISL6841IU

-40 to 105

8 Ld MSOP

M8.118

ISL6841IUZ
(See Note)

-40 to 105

8 Ld MSOP
(Pb-free)

M8.118

ISL6842IB

-40 to 105

8 Ld SOIC

M8.15

ISL6842IBZ
(See Note)

-40 to 105

8 Ld SOIC
(Pb-free)

M8.15

ISL6842IU

-40 to 105

8 Ld MSOP

M8.118

ISL6842IUZ
(See Note)

-40 to 105

8 Ld MSOP
(Pb-free)

M8.118

ISL6843IB

-40 to 105

8 Ld SOIC

M8.15

ISL6843IBZ
(See Note)

-40 to 105

8 Ld SOIC
(Pb-free)

M8.15

ISL6843IU

-40 to 105

8 Ld MSOP

M8.118

ISL6843IUZ
(See Note)

-40 to 105

8 Ld MSOP
(Pb-free)

M8.118

ISL6844IB

-40 to 105

8 Ld SOIC

M8.15

ISL6844IBZ
(See Note)

-40 to 105

8 Ld SOIC
(Pb-free)

M8.15

ISL6844IU

-40 to 105

8 Ld MSOP

M8.118

ISL6844IUZ
(See Note)

-40 to 105

8 Ld MSOP
(Pb-free)

M8.118

ISL6845IB

-40 to 105

8 Ld SOIC

M8.15

ISL6845IBZ
(See Note)

-40 to 105

8 Ld SOIC
(Pb-free)

M8.15

ISL6845IU

-40 to 105

8 Ld MSOP

M8.118

ISL6845IUZ
(See Note)

-40 to 105

8 Ld MSOP
(Pb-free)

M8.118

ISL6840IRZ-T*
(See Note)

-40 to 105

8 Ld 2x3 DFN
(Pb-free)

L8.2x3

ISL6841IRZ-T*
(See Note)

-40 to 105

8 Ld 2x3 DFN
(Pb-free)

L8.2x3

ISL6842IRZ-T
(See Note)

-40 to 105

8 Ld 2x3 DFN
(Pb-free)

L8.2x3

ISL6843IRZ-T
(See Note)

-40 to 105

8 Ld 2x3 DFN
(Pb-free)

L8.2x3

ISL6844IRZ-T*
(See Note)

-40 to 105

8 Ld 2x3 DFN
(Pb-free)

L8.2x3

ISL6845IRZ-T
(See Note)

-40 to 105

8 Ld 2x3 DFN
(Pb-free)

L8.2x3

Add -T to part number for Tape and Reel packaging.

*Contact Factory for Availability

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.

Ordering Information

PART NUMBER

TEMP. RANGE

(°C)

PACKAGE

PKG.

DWG. #

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

FN9124.6

June 28, 2005

Absolute Maximum Ratings

Thermal Information

Supply Voltage, V

. . . . . . . . . . . . . . . . . . . GND - 0.3V to +20.0V

OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to V

+ 0.3V

Signal Pins . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to 6.0V
Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1A
ESD Classification

Human Body Model (Per MIL-STD-883 Method 3015.7) . . .2000V
Charged Device Model (Per EOS/ESD DS5.3, 4/14/93) . . .1000V

Operating Conditions

Temperature Range

ISL684xIx . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 105°C

Supply Voltage Range (Typical)

ISL6840/1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5V -14V

ISL6843/5 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9V -16V
ISL6842/4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V -18V

Thermal Resistance (Typical, Note 1)

(°C/W)

DFN Package (Note 2). . . . . . . . . . . . .

SOIC Package . . . . . . . . . . . . . . . . . . .

100

N/A

MSOP Package . . . . . . . . . . . . . . . . . .

130

N/A

Maximum Junction Temperature . . . . . . . . . . . . . . . . -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)

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:

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

2. For

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

3. All voltages are with respect to GND.

Electrical Specifications

Recommended operating conditions unless otherwise noted. Refer to Block Diagram and Typical Application
schematic. V

= 15V (Note 7), Rt = 10k

, Ct = 3.3nF, T

= -40 to 105°C (Note 4), Typical values are at

= 25°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

UNDERVOLTAGE LOCKOUT

START Threshold (ISL6840, ISL6841)

6.5

7.0

7.5

START Threshold (ISL6843, ISL6845)

7.8

8.4

9.0

START Threshold (ISL6842, ISL6844)

13.3

14.3

15.3

STOP Threshold (ISL6840, ISL6841)

6.1

6.6

6.9

STOP Threshold (ISL6843, ISL6845)

6.7

7.2

7.7

STOP Threshold (ISL6842, ISL6844)

8.0

8.8

9.6

Hysteresis (ISL6840, ISL6841)

0.4

Hysteresis (ISL6843, ISL6845)

0.8

Hysteresis (ISL6842, ISL6844)

5.4

Startup Current, I

< START Threshold

100

µA

Operating Current, I

(Note 5)

3.3

4.0

Operating Supply Current, I

Includes 1nF GATE loading

4.1

5.5

REFERENCE VOLTAGE

Overall Accuracy

Over line (V

= 12V to 18V), load,

temperature

4.925

5.000

5.050

Long Term Stability

= 125°C, 1000 hours (Note 6)

Fault Voltage

4.40

4.65

4.85

VREF Good Voltage

4.60

4.80

VREF-0.05

Hysteresis

165

250

Current Limit, Sourcing

-20

Current Limit, Sinking

ISL6840, ISL6841, ISL6842, ISL6843, ISL6844, ISL6845

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: ISL6842IU

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: ISL6842IU