DATASHEET ISL78322 FN7908 Rev 3.00 Dual 2A/1.7A, 2.25MHz High-Efficiency, Synchronous Buck Regulator November 30, 2016 The ISL78322 is a high-efficiency, dual synchronous step-down Features DC/DC regulator that can deliver up to 2A/1.7A continuous Dual 2A/1.7A high-efficiency, synchronous buck regulator output current per channel. The channels are 180 out-of- with up to 97% efficiency phase for input RMS current and EMI reduction. The supply voltage range of 2.8V to 5.5V allows for the use of a single Li+ 2.8V to 5.5V input supply range cell, three NiMH cells or a regulated 5V input. The current 180 out-of-phase outputs reduce ripple current and EMI mode control architecture enables very low duty cycle Start-up with prebiased output prevents negative current operation at high frequency with fast transient response and flow in output stage excellent loop stability. The ISL78322 operates at 2.25MHz switching frequency, which allows for the use of small, low cost External synchronization up to 8MHz inductors and capacitors. Each channel is optimized for Negative current detection and protection generating an output voltage as low as 0.6V. 100% maximum duty cycle for lowest dropout The ISL78322 has a forced PWM mode that reduces noise and Internal current mode compensation RF interference. Peak current limiting, hiccup mode short-circuit protection, The ISL78322 offers a 1ms Power-Good (PG) signal to monitor and over-temperature protection both outputs at power-up. When shut down, ISL78322 discharges the output capacitors. Other features include Pb-free (RoHs compliant) internal digital soft-start, enable for power sequence, AEC-Q100 qualified component overcurrent protection, and thermal shutdown. The ISL78322 is offered in a 4mmx3mm, 12 Lead DFN package with 1mm Applications maximum height. The complete converter occupies less than 2 DC/DC POL modules 1.8cm area. C/P, FPGA, and DSP power The ISL78322 is qualified to AEC-Q100 and specified for Automotive embedded processor power supply systems operation across the -40C to +105C (grade 2) ambient temperature range. Related Literature For a full list of related documents, visit our website - ISL78322 product page 100 90 80 2.5V PWM 3.3V PWM OUT1 OUT2 70 60 50 2.25MHz 5V AT +25C IN 40 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 OUTPUT LOAD (A) FIGURE 1. CHARACTERISTIC CURVE FN7908 Rev 3.00 Page 1 of 17 November 30, 2016 EFFICIENCY (%)ISL78322 Typical Applications L 1 OUTPUT1 1.2H 2.5V/2A LX1 C 2 22F C PGND 3 10pF R 2 316k INPUT 2.8V TO 5.5V FB1 VIN R 3 EN1 100k C 1 2 x 10F ISL78322 EN2 L 2 OUTPUT2 1.2H 1.8V/1.7A LX2 PG C 4 22F PGND C 5 SYNC 10pF R 5 200k FB2 R 6 100k FIGURE 2. TYPICAL APPLICATION DIAGRAM - DUAL INDEPENDENT OUTPUTS Ordering Information PACKAGE PKG. PART NUMBER (Notes 1, 2, 3) PART MARKING TEMP. RANGE (C) (RoHS COMPLIANT) DWG. ISL78322ARZ BEKA -40 to +105 12 Ld 4x3 DFN L12.4x3 NOTES: 1. Add -T suffix for 6k unit or -T7A suffix for 250 unit tape and reel options. 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), see device information page for ISL78322. For more information on MSL, see techbrief TB363. TABLE 1. COMPONENT VALUE SELECTION V 0.8V 1.2V 1.5V 1.8V 2.5V 3.3V OUT C 2x10F 2x10F 2x10F 2x10F 2x10F 2x10F 1 C (or C ) 22F 22F 22F 22F 22F 22F 2 4 C (or C ) 10pF 10pF 10pF 10pF 10pF 10pF 3 5 L (or L ) 1.0~2.2H 1.0~2.2H 1.0~2.2H 1.5~3.3H 1.5~3.3H 1.5~4.7H 1 2 R (or R ) 33k 100k 150k 200k 316k 450k 2 5 R (or R ) 100k 100k 100k 100k 100k 100k 3 6 In Table 1, the minimum output capacitor value is given for different output voltages to make sure the whole converter system is stable. Output capacitance should increase to support faster load transient requirement. FN7908 Rev 3.00 Page 2 of 17 November 30, 2016