The ISL78322 is a high-efficiency, dual synchronous step-down DC/DC regulator that can deliver up to 2A/1. 7A continuous output current per channel. The channels are 180° out-of-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+ cell, three NiMH cells or a regulated 5V input. The current mode control architecture enables very low duty cycle operation at high frequency with fast transient response and excellent loop stability. The ISL78322 operates at 2. 25MHz switching frequency, which allows for the use of small, low cost inductors and capacitors. Each channel is optimized for generating an output voltage as low as 0. 6V. The ISL78322 has a forced PWM mode that reduces noise and RF interference. The ISL78322 offers a 1ms Power-Good (PG) signal to monitor both outputs at power-up. When shut down, ISL78322 discharges the output capacitors. Other features include internal digital soft-start, enable for power sequence, overcurrent protection, and thermal shutdown. The ISL78322 is offered in a 4mmx3mm, 12 Lead DFN package with 1mm maximum height. The complete converter occupies less than 1. 8cm2 area. The ISL78322 is qualified to AEC-Q100 and specified for operation across the -40°C to +105°C (grade 2) ambient temperature range.

Features

  • Dual 2A/1.7A high-efficiency, synchronous buck regulator with up to 97% efficiency
  • 2.8V to 5.5V input supply range
  • 180° out-of-phase outputs reduce ripple current and EMI
  • Start-up with prebiased output prevents negative current flow in output stage
  • External synchronization up to 8MHz
  • Negative current detection and protection
  • 100% maximum duty cycle for lowest dropout
  • Internal current mode compensation
  • Peak current limiting, hiccup mode short-circuit protection, and over-temperature protection
  • Pb-free (RoHs compliant)
  • AEC-Q100 qualified component

Applications

  • DC/DC POL modules
  • µC/µP, FPGA and DSP power
  • Automotive embedded processor power supply systems

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active DFN Tube 75
Availability
Active DFN Reel 6000
Availability
Active DFN Reel 250
Availability

Documentation & Downloads

Title Other Languages Type Format File Size Date
Datasheets & Errata
ISL78322 Datasheet Datasheet PDF 1.28 MB
Application Notes & White Papers
AN1681: Grounding Techniques Application Note PDF 509 KB
AN1684: Nonideality of Ground Application Note PDF 397 KB
Other
ISL78322 iSim:PE Model Schematic SXSCH 218 KB
PA16098A - Datasheet Specification Change for Listed Intersil ISL78322ARZ* Products Product Advisory PDF 394 KB
PA16098 - Datasheet Specification Change for Listed Intersil ISL78322ARZ* Products Product Advisory PDF 394 KB

Software & Tool Pages

Title Type Description Company
iSim:PE Offline Simulation Tool Simulator iSim Personal Edition (iSim:PE) speeds the design cycle and reduces risk early in any project, identifying parts that can be used in current as well as next-generation designs. Renesas