DATASHEET ISL9440, ISL9440A, ISL9441 FN6383 Rev 2.00 Triple, 180 Out-of-Phase, Step-Down PWM and Single Linear Controller February 9, 2015 The ISL9440, ISL9440A and ISL9441 are quad-output Features synchronous buck controllers that integrate 3 PWM Three integrated synchronous buck PWM controllers controllers and 1 low drop-out linear regulator controller, which - Internal bootstrap diodes are full featured and designed to provide multi-rail power for - Internal compensation use in products such as cable and satellite set-top boxes, - Internal soft-start VoIP gateways, cable modems, and other home connectivity products as well as a variety of industrial and general purpose Independent control for each regulator and programmable applications. Each output is adjustable down to 0.8V. The output voltages independent enable/shutdown PWMs are synchronized at 180 out of phase thus reducing Fixed Switching Frequency: 300kHz (ISL9440, ISL9441) the RMS input current and ripple voltage. 600kHz (ISL9440A) The ISL9440, ISL9440A and ISL9441 offer internal soft-start, Adaptive shoot through protection on all synchronous independent enable inputs for ease of supply rail buck controllers sequencing, and integrated UV/OV/OC/OT protections in a Independently programmable voltage outputs space conscious 5mmx5mm QFN package. The ISL9440 and ISL9440A offers an early warning function to output a Out-of-phase switching to reduce input capacitance logic signal to warn the system to back up data when the (0/180/0) input voltage falls below a certain level. No external current sense resistor The ISL9440, ISL9440A and ISL9441 are utilize internal loop - Uses lower MOSFETs r DS(ON) compensation to keep minimum peripheral components for Current mode controller with voltage feed forward compact design and a low total solution cost. These devices are implemented with current mode control with feed forward Complete protection to cover various applications even with fixed internal - Overcurrent, overvoltage, undervoltage lockout, compensations. over-temperature Cycle-by-cycle current limiting The table below shows the difference in terms of the ISL9440, ISL9440A and ISL9441 features. Wide input voltage range - Input rail powers VIN Pin: 5.6V to 24V PART EARLY SWITCHING FREQUENCY NUMBER WARNING (kHz) - Input rail powers VCC 5V Pin (VIN tied to VCC 5V, for 5V input applications): 4.5V to 5.6V ISL9440 YES 300 Early warning (ISL9440, ISL9440A) on input voltage ISL9440A YES 600 failure ISL9441 NO 300 Integrated reset function (ISL9440, ISL9440A) Pb-free (RoHS compliant) Applications Satellite and cable set-top boxes Cable modems VoX gateway devices NAS/SAN devices Related Literature Technical Brief TB389 PCB Land Pattern Design and Surface Mount Guidelines for QFN (MLFP) Packages FN6383 Rev 2.00 Page 1 of 20 February 9, 2015ISL9440, ISL9440A, ISL9441 Pinout ISL9440, ISL9440A, ISL9441 (32 LD 5X5 QFN) TOP VIEW 32 31 30 29 28 27 26 25 ISEN1 ISEN2 1 24 PGOOD 2 23 PGND VCC 5V LGATE3 3 22 VIN UGATE3 4 21 EN1 5 20 BOOT3 FB1 PHASE3 6 19 OCSET1 7 18 ISEN3 RST 8 17 EN3 910 11 12 13 14 15 16 Ordering Information PART NUMBER PART TEMP. RANGE PACKAGE PKG. (Note 1, 2, 3) MARKING (C) (Pb-Free) DWG. ISL9440IRZ* ISL9440IRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B ISL9440AIRZ* 9440AIRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B ISL9441IRZ* ISL9441IRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B NOTES: 1. *Add -T* suffix for tape and reel. Please refer to TB347 for details on reel specifications. 2. 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. 3. For Moisture Sensitivity Level (MSL), please see device information page for ISL9440, ISL9440A, ISL9441. For more information on MSL, please see tech brief TB363 FN6383 Rev 2.00 Page 2 of 20 February 9, 2015 G4 PHASE1 LDOFB BOOT1 SGND UGATE1 OCSET2 LGATE1 FB2 LGATE2 EN2 UGATE2 BOOT2 OCSET3 FB3 PHASE2