ISL28023

Precision Digital Power Monitor with Margining

OVERVIEW

The ISL28023 is a bidirectional high-side and low-side digital current sense and voltage monitor with a serial interface. The device monitors power supply current, voltage and provides the digital results along with calculated power. The ISL28023 provides tight accuracy of 0.05% for both voltage and current monitoring. The auxiliary input provides an additional power monitor function.

The VCC power can either be externally supplied or internally regulated, which allows the ISL28023 to handle a common-mode input voltage range from 0V to 60V. The wide range permits the device to handle telecom, automotive and industrial applications with minimal external circuitry.

An 8-bit voltage DAC enables a DC/DC converter output voltage margining. Fault indication includes a Bus Voltage window and overcurrent fast fault logic indication.

The ISL28023 serial interface is PMBus compatible and operates down to 1.2V voltage. It draws an average current of just 800µA and is available in the space saving 24 Ld QFN 4mmx4mm package. The part operates across the full industrial temperature range from -40°C to +125°C.

KEY FEATURES

  • Bus voltage sense range: 0V to 60V
  • Voltage gain error: 0.05%
  • Current gain error: 0.05%
  • Internal temperature sensor accuracy: +1.0°C
  • High or low (RTN) side sensing
  • Bidirectional current sensing
  • Auxiliary low voltage channel
  • ∆∑ADC, 16-bit native resolution
  • Programmable averaging modes
  • Internal 3.3V regulator
  • Internal temperature sense
  • Overvoltage/undervoltage and current fault monitoring with 500ns detection delay
  • 8-bit voltage output DAC
  • I2C/SMBus/PMBus interface that handles 1.2V supply

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL28023
Basic Information
Production Status
Mass Production
VS (min)
3.0 V
VS (max)
5.5 V
IS (per amp)
1.24 mA
PSRR (dB)
127
Output
I2C
Gain Error/Measurement Error Max
0.25
Max Offset Voltage
50 µV
CMRR (dB)
136
Common Mode Input Range (min)
0 V
Common Mode Input Range (max)
12V or 60V
Qualification Level
Standard
Can Sample
YES
Temperature Range
-40 to +125

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