ISL8278M

Digital DC/DC PMBus 33A Module

OVERVIEW

The ISL8278M is a 33A step-down, DC/DC power supply module with an integrated digital PWM controller, synchronous power switches, an inductor, and passives. Only bulk input and output capacitors are needed to finish the design. The 33A of continuous output current can be delivered without need for airflow or a heatsink. The thermally enhanced HDA module is capable of dissipating heat directly into the PCB.

The ISL8278M uses ChargeMode™ control architecture, which responds to a transient load within a single switching cycle. The ISL8278M comes with a preprogrammed configuration for operating in a pin-strap mode. Output voltage, switching frequency, and device SMBus address can be programmed with external resistors. More configurations, such as soft-start and fault limits can be easily programmed or changed using a PMBus compliant serial bus interface. PMBus can be used to monitor voltages, current, temperatures, and fault status. The ISL8278M is supported by PowerNavigator™ software, a Graphical User Interface (GUI) that can be used to configure modules for a desired solution.

The ISL8278M is available in a 41 Ld compact 17mmx19mm HDA module with a very low profile height of 3.6mm, suitable for automated assembly by standard surface mount equipment. The ISL8278M is RoHS compliant by exemption.

KEY FEATURES

  • Complete digital switch-mode power supply
  • Wide VIN range: 4.5V to 14V
  • Programmable VOUT range: 0.6V to 5V
  • PMBus compliant I2C communication interface
  • Programmable VOUT, margining, UV/OV, IOUT limit, soft-start/stop, sequencing, and external synchronization
  • Monitor: VIN, VOUT, IOUT, temperature, duty cycle, switching frequency, and faults
  • ChargeMode control architecture
  • ±1.0% VOUT accuracy over line, load, and temperature
  • Power-good indicator
  • Over-temperature protection
  • Internal nonvolatile memory and fault logging
  • Patented thermally enhanced HDA package
  • Intuitive configuration using PowerNavigator

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8278M
Basic Information
Production Status
Mass Production
Input Voltage Min (V)
4.5
Input Voltage Max (V)
14
Output Voltage Min (V)
0.6
Output Voltage Max (V)
5
Output Current Max (A)
33
IQ
40 mA
Peak Efficiency (%)
96
POR
Yes
Switching Freq. (min) (MHz)
0.296
Switching Freq. (max) (MHz)
1.067
Control Type
Digital
SYNCH Capability
Yes
Current Sharing
No
Tracking
No
Digital
Yes
Qualification Level
Standard
Switching Frequency Range (MHz)
0.296 to 1.067 MHz
Temperature Range
-40 to +85

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