DATASHEET ISL6401 FN9007 Rev 8.00 Synchronizing Current Mode PWM for Subscriber Line Interface Circuits (SLICs) Oct 21, 2015 The ISL6401 adjustable frequency, low power, pulse width Features modulating (PWM) current mode controller is designed for a Positive and Negative Output Regulation wide range of DC/DC conversion applications including boost, flyback, and isolated output configurations. The Starting Supply Current . 100A (typ.) device is optimized to provide a high performance, low-cost Quiescent Current 55A (typ.) solution for Ringing SLIC (RSLIC) ring and talk power Output Frequency Range 50kHz to 600kHz supplies. An integrated inverter allows for easy design of negative voltage regulation circuits with a minimal amount of External Clock Synchronization external components. Internal soft-start minimizes start-up Fast Transient Response with Peak Current Mode Control stress without any external components. Peak current mode control effectively handles Ring trip transients and provides Internal Soft-Start inherent overcurrent protection. Drives N-Channel MOSFET This advanced BiCMOS design features low operating Logic Level Shutdown current, adjustable operating output frequency (50kHz to 600kHz), internal soft-start and a SYNC input that allows the Leading Edge Blanking oscillator to be locked to an external clock for noise sensitive 1% Tolerance Voltage Reference Over Line and applications. DC/DC conversion efficiency is optimized by Temperature use of a low current sense voltage. A logic level shutdown Pb-Free Available (RoHS Compliant) input is included, which reduces supply current to 55 A in the shutdown mode. Applications Pinouts VoIP/VoDSL Ringer and Off-Hook Voltage Generators ISL6401 (SOIC) TOP VIEW Multi-Output Flyback Supplies SD 1 14 V CC Cable and DSL Modems SYNC 2 13 PV CC Set-Top Boxes CT 3 12 GATE Wireless Local Loops COMP 4 11 PGND LMDH and FTTH Supplies FB 5 10 GND Boost Regulators NFB OUT 6 9 CS Routers NFB IN 7 8 NC ISL6401 (QFN) TOP VIEW 16 15 14 13 PGND SYNC 1 12 CT PGND 2 11 GND COMP 3 10 CS FB 4 9 576 8 FN9007 Rev 8.00 Page 1 of 13 Oct 21, 2015 NO LONGER RECOMMENDED OR SUPPORTED NFB OUT SD NFB IN VCC NC PVCC NC GATEISL6401 Ordering Information PART NUMBER TEMP. PACKAGE (Notes 1, 2, 3) RANGE (C) (RoHS Compliant) PKG. DWG. ISL6401CBZ -40 to 85 14 Ld SOIC (Pb-free) M14.15 ISL6401CRZ (No longer available, recommended replacement: -40 to 85 16 Ld 4x4 QFN (Pb-free) L16.4x4 ISL6401CBZ) NOTES: 1. Add -T suffix for tape and reel packaging. 2. 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. 3. 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. Functional Block Diagram 10 14 1 3 2 GND VCC SD CT SYNC 200K VREF VOLTAGE OSC 4 COMP REFERENCE 13 PVCC IBIAS ERROR AMP ICSCOMP + ILIM 5 - - S + FB GATE 12 RQ SOFT-START TFF CLK Q 11 CLK R POR SOFT- PWRGND UVLO ENPWM START VREF V CC LVC LEADING - 9 CS + EDGE - CS BLANKING + ICLCOMP NFB AMP NFB IN NFB-OUT NC 8 76 FN9007 Rev 8.00 Page 2 of 13 Oct 21, 2015