ISL6401_14 Datasheet, PDF (1/11 Pages) Intersil Corporation – Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs)

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Data Sheet
April 13, 2005
ISL6401
FN9007.7
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 1
SYNC 2
CT 3
COMP 4
FB 5
NFB OUT 6
NFB IN 7
14 V_CC
13 PV_CC
12 GATE
11 PGND
10 GND
9 CS
8 NC
ISL6401 (QFN)
TOP VIEW
16 15 14 13
SYNC 1
12 ^PGND
CT 2
11 ^PGND
COMP 3
10 ^GND
FB 4
9 ^CS
5678
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
TEMP.
PART NUMBER RANGE (°C)
PACKAGE
ISL6401CB
-40 to 85 14 Ld SOIC
PKG.
DWG. #
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 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.
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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