intersil ISL6401 DATA SHEET

®

www.BDTIC.com/Intersil

ISL6401

Data Sheet April 13, 2005

Synchronizing Current Mode PWM for
Subscriber Line Interface Circuits (SLICs)

The ISL6401 adjustable frequency, low power, pulse width
modulating (PWM) current mode controller is designed for a
wide range of DC/DC conversion applications including
boost, flyback, and isolated output configurations. The
device is optimized to provide a high performance, low-cost
solution for Ringing SLIC (RSLIC) ring and talk power
supplies. An integrated inverter allows for easy design of
negative voltage regulation circuits with a minimal amount of
external components. Internal soft-start minimizes start-up
stress without any external components. Peak current mode
control effectively handles Ring trip transients and provides
inherent overcurrent protection.

This advanced BiCMOS design features low operating
current, adjustable operating output frequency (50kHz to
600kHz), internal soft-start and a SYNC input that allows the
oscillator to be locked to an external clock for noise sensitive
applications. DC/DC conversion efficiency is optimized by
use of a low current sense voltage. A logic level shutdown
input is included, which reduces supply current to 55µA in
the shutdown mode.

Pinouts

ISL6401 (SOIC)

TOP VIEW

SD

NFB OUT

SYNC

CT

COMP

FB

SYNC

CT

COMP

FB

NFB IN

1

2

3

4

1

2

3

4

5

6

7

ISL6401 (QFN)

TOP VIEW

SD

VCC

1516 14 13

6578

NFB IN

NFB OUT

PVCC

NC

14

13

12

11

10

GATE

NC

9

8

V

PV

GATE

PGND

GND

CS

NC

12

11

10

9

CC

CC

PGND

PGND

GND

CS

FN9007.7

Features

• Positive and Negative Output Regulation

• Starting Supply Current . . . . . . . . . . . . . . . . . 100µA (typ.)

• Quiescent Current . . . . . . . . . . . . . . . . . . . . . . 55µA (typ.)

• Output Frequency Range. . . . . . . . . . . . 50kHz to 600kHz

• External Clock Synchronization

• Fast Transient Response with Peak Current Mode Control

• Internal Soft-Start

• Drives N-Channel MOSFET

• Logic Level Shutdown

• Leading Edge Blanking

• 1% Tolerance Voltage Reference Over Line and
Temperature

• Pb-Free Available (RoHS Compliant)

Applications

• VoIP/VoDSL Ringer and Off-Hook Voltage Generators

• Multi-Output Flyback Supplies

• Cable and DSL Modems

• Set-Top Boxes

• Wireless Local Loops

• LMDH and FTTH Supplies

• Boost Regulators

•Routers

Ordering Information

PART NUMBER

ISL6401CB -40 to 85 14 Ld SOIC M14.15

ISL6401CBZ (Note) -40 to 85 14 Ld SOIC (Pb-free) M14.15

ISL6401CR -40 to 85 16 Ld 4x4 QFN L16.4x4

ISL6401CRZ (Note) -40 to 85 16 Ld 4x4 QFN (Pb-free) L16.4x4

Add -T suffix for tape and reel packaging.

NOTES:

1. The parts with suffix ‘C’ are being tested to the industrial temperature
grade. This has been updated in the table above. The IB and IR parts are
being discontinued. The affected parts are: ISL6401IB, ISL6401IBZ,
ISL6401IB-T, ISL6401IBZ-T, ISL6401IR, ISL6401IRZ, ISL6401IR-T,
ISL6401IRZ-T.

2. 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 Pb­free 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.

TEMP.

RANGE (°C) PACKAGE

PKG.

DWG. #

1

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

1-888-INTERSIL or 1-888-352-6832

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

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

Copyright © Intersil Americas Inc. 2001-2005. All Rights Reserved

Functional Block Diagram

www.BDTIC.com/Intersil

ISL6401

VCCGND

VREF

4

5

9

FB

CS

COMP

ERROR

+

-

VREF

AMP

CS

VOLTAGE

REFERENCE

IBIAS

ICSCOMP

­+

SOFT-START

POR

UVLO

­+

ICLCOMP

LVC

SOFT-

START

200K

ILIM

ENPWM

Typical Application Schematic for 4 Line VoIP

VIN

9V TO

20V

+5V

±10%

GND

0.027µF

VCC

220pF

C6

C5

R2

10K

R1

20K

C4

560pF

E

R3

1.24K

C1A-E

2.2µF

35V

SD

1

2

SYNC

3

CT

4

COMP

5

FB

6

NFB

7 8

NFB_IN

PV

GATE

GNDP

ISL6401

V

CC

CC

GND

CS

NC

C2
1µF
50V

14

13

12

11

10

9

C3
1µF
16V

R6

100

C7
1000pF

8

000000

PRI

1

Q1
IRLR2905

R5

0.025
1W

11410

SD

CLK

LEADING

EDGE

BLANKING

S

RQ

TFF

CLKRQ

T1

IFLY0012

CT SYNC

OSC

NFB_IN

768NC

2

SEC

7

0

3

MUR5120T3

0

6

4

MUR5160T3

5

0

R7

220

C8
330pF

23

13

PVCC

GATE

12

11

PWRGND

V

CC

­+

NFB
AMP

NFB-OUT

GND

-24V,
120mA

-72V,
120mA

D1

D2

C9

100µF

100V

C10A

+

330µF
35V

+

R4B

143K

C11
1µF

R4A

43.5K

VOUT1

VOUT2

C12

0.1µF

NOTES:

3. C2 fit as close as possible to transformer.

4. T1 = IFLY0012 contacts: Coilcraft: [phone] GCI Technology: [phone] ext. 245

5. For custom specific designs or questions please contact Intersil at 1-888-INTERSIL or 321-724-7143.

2

FN9007.7

April 13, 2005

ISL6401

www.BDTIC.com/Intersil

Absolute Maximum Ratings Thermal Information

Supply Voltage, V

PGND to GND . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±0.3V

Peak GATE Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1A

ESD Classification . . . . . . . . . . . . . . . . . . . . . Class 1 (HBM, 2500V)

NFB Pin Voltage. . . . . . . . . . . . . . . . . . . . . . ±10V (Transient, 10ms)

CC,PVCC

Operating Conditions

Temperature Range

ISL6401C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40°C to 85°C

Supply Voltage Range (Typical). . . . . . . . . . . . . . . . . . . . . 5V ±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:

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

6. θ

JA

7. θ

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

JA

“case temp” is measured at the center of the exposed metal pad on the package underside. See Tech Brief TB379.

8. All voltages are with respect to GND.

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

SUPPLY

V

CC

Supply Voltage Range 4.5 5.0 5.5 V

Shutdown Supply Current SHDN = GND - 55 100 µA

Start-Up Current V

Operating Supply Current (Note 10) - 3.7 6.0 mA

REFERENCE VOLTAGE

Output Voltage 1.237 1.25 1.262 V

Long Term Stability T

NEGATIVE FEEDBACK

Source Current -1.02.0mA

CURRENT SENSE

Maximum Input Signal 0.2 0.260 0.3 V

Input Bias Current -2.0 0.0 2.0 µA

Overcurrent Threshold 0.4 0.52 0.6 V

ERROR AMPLIFIER

Open Loop Voltage Gain -78-dB

Gain-Bandwidth Product 10 - - MHz

Input Voltage 1.225 1.25 1.275 V

Input Bias Current -1.0-µA

PWM

Maximum Duty Cycle 47 48 50 %

Minimum Duty Cycle COMP = 0V - 0 - %

UNDERVOLTAGE LOCKOUT

Start Threshold 3.7 4.1 4.3 V

Stop Threshold 3.2 3.6 4.0 V

. . . . . . . . . . . . . . . . GND -0.3V to +7.0V

schematic. V

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

= +5.0V ±10%, TA = -40 to 85°C (Note 9), Typical values are at TA = 25°C

CC

< 3.7V - 0.1 0.20 mA

CC

= 125°C, 1000 hours - 5 - mV

A

Thermal Resistance (Typical) θ

14 Lead SOIC (Note 6) . . . . . . . . . . . . 90 NA

16 Lead QFN (Note 7) . . . . . . . . . . . . . 46 9

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)
For Recommended soldering conditions see Tech Brief TB389.

(°C/W) θJC (°C/W)

JA

JC,

the

3

FN9007.7

April 13, 2005

ISL6401

www.BDTIC.com/Intersil

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

schematic. V

PARAMETER TEST CONDITIONS MIN TYP MAX UNITS

Start to Stop Hysteresis 0.2 0.5 0.8 V

SOFT-START - DIGITAL

COMP Rise Time Rise from 0.5V to REF -1V - 2048 clk -

OSCILLATOR

Gate Output Frequency Ct = 560pF 90 100 108 kHz

Gate Output Frequency Range 50 - 600 kHz

Temperature Stability -5-%

Sync. Frequency Range 1.1 Times the natural switching

Sync Input HIGH 3.5 - - V

Sync Input LOW --1.5V

Minimum Sync. Input Pulse Duty Cycle - 20 - %

OUTPUT

GATE Low Level -0.20.5V

GATE High V

Rise Time C load = 1500pF - 35 - ns

Fall Time C load = 1500pF - 40 - ns

NOTES:

9. Specifications at -40°C are guaranteed by design, not production tested.

10. This is the V

SAT

current consumed when the device is active but not switching. Does not include gate drive current.

CC

= +5.0V ±10%, TA = -40 to 85°C (Note 9), Typical values are at TA = 25°C (Continued)

CC

frequency.

--1.2MHz

4.4 4.9 5.5 V

Typical Performance Curves

120

100

80

60

40

FREQUENCY (kHz)

20

0

-40 -20 25 60 85

FIGURE 1. FREQUENCY vs TEMPERATURE FIGURE 2. REFERENCE VOLTAGE vs TEMPERATURE

TEMPERATURE (°C)

VOLTAGE (V)

2.0

1.8

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

0

-40 -20 25 60 85

TEMPERATURE (°C)

4

FN9007.7

April 13, 2005