DATASHEET ISL9440B, ISL9440C FN6799 Rev 4.00 Triple Step-Down PWM and Single Linear Controller with Programmable Soft-Start February 18, 2016 The ISL9440B and ISL9440C are quad-output synchronous Features buck controllers that integrate three PWM controllers and one Three Integrated Synchronous Buck PWM Controllers low drop-out linear regulator controller, which are full featured and designed to provide multi-rail power for use in products - Internal Bootstrap Diodes such as cable and satellite set-top boxes, VoIP gateways, - Internal Compensation cable modems, and other home connectivity products as well as a variety of industrial and general purpose applications. Independent Control for each Regulator and Programmable Output Voltages Independent Each output is adjustable down to 0.8V. The PWMs are Enable/Shutdown/Soft-start synchronized at 180 out-of-phase thus, reducing the RMS input current and ripple voltage. Fixed Switching Frequency: 300kHz(B), 600kHz(C) The ISL9440B and ISL9440C offer programmable 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 space conscious 5mmx5mm QFN package. An early Pre-biased Output Start-up Capability warning function is offered to output a logic signal to warn Out-of-Phase Switching to Reduce Input Capacitance the system to back up data when input voltage falls below a (0/180/0) certain level. No External Current Sense Resistor The ISL9440B and ISL9440C utilize internal loop compensation to keep minimum peripheral components for - Uses Lower MOSFETs r DS(ON) compact design and a low total solution cost. These devices Current Mode Controller with Voltage Feed-Forward are implemented with current mode control with feed-forward to cover various applications even with fixed internal Complete Protection compensations. - Overcurrent, Overvoltage, Undervoltage Lockout, Table 1 shows the difference in terms of ISL944xx family Over-Temperature features. Cycle-by-Cycle Current Limiting TABLE 1. Wide Input Voltage Range SWITCHING PART EARLY FREQUENCY SOFT-STARTING - Input Rail Powers VIN Pin: 5.6V to 24V NUMBER WARNING (kHz) TIME (ms) - Input Rail Powers VCC 5V Pin (VIN tied to VCC 5V, for ISL9440 Yes 300 1.7 5V input applications): 4.5V to 5.6V ISL9440A Yes 600 1.7 Early Warning on Input Voltage Failure ISL9441 No 300 1.7 Integrated Reset Function ISL9440B Yes 300 Programmable Pb-Free (RoHS Compliant) ISL9440C Yes 600 Programmable (No longer Applications available or supported) Satellite and Cable Set-Top Boxes Cable Modems VoX Gateway Devices NAS/SAN Devices ATX Power Supply Related Literature Technical Brief TB389 PCB Land Pattern Design and Surface Mount Guidelines for QFN (MLFP) Packages FN6799 Rev 4.00 Page 1 of 25 February 18, 2016ISL9440B, ISL9440C Ordering Information PART NUMBER PART TEMP. RANGE PACKAGE PKG. (Notes 1, 2, 3) MARKING (C) (RoHS Compliant) DWG. ISL9440BIRZ 9440B IRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B ISL9440CIRZ 9440C IRZ -40 to +85 32 Ld 5x5 QFN L32.5x5B (No longer available, recommended replacement: ISL9440IRZ) NOTES: 1. Add -T 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 ISL9440B, ISL9440C. For more information on MSL please see techbrief TB363. Pinout ISL9440B, ISL9440C (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 EN/SS1 5 20 BOOT3 FB1 PHASE3 6 19 OCSET1 7 18 ISEN3 RST 8 17 EN/SS3 910 11 12 13 14 15 16 FN6799 Rev 4.00 Page 2 of 25 February 18, 2016 G4 PHASE1 LDOFB BOOT1 SGND UGATE1 OCSET2 LGATE1 FB2 LGATE2 UGATE2 EN/SS2 BOOT2 OCSET3 FB3 PHASE2