ISL8502A

2A Synchronous Buck Regulator with Integrated MOSFETs

Product Status: Mass Production

OVERVIEW

The ISL8502A is a synchronous buck controller with internal MOSFETs packaged in a small 4mmx4mm QFN package. The ISL8502A can support a continuous load of 2A and has a very wide input voltage range. With the switching MOSFETs integrated into the IC, the complete regulator footprint can be very small and provide a much more efficient solution than a linear regulator.

The ISL8502A is capable of stand-alone operation or it can be used in a master slave combination for multiple outputs that are derived from the same input rail. Multiple slave channels (up to six) can be synchronized. This method minimizes the EMI and beat frequencies effect with multi-channel operation.

The switching PWM controller drives two internal N-Channel MOSFETs in a synchronous-rectified buck converter topology. The synchronous buck converter uses voltage-mode control with fast transient response. The switching regulator provides a maximum static regulation tolerance of ±1% over line, load, and temperature ranges. The output is user-adjustable by means of external resistors down to 0.6V.

The output is monitored for undervoltage events. The switching regulator also has overcurrent protection. Thermal shutdown is integrated. The ISL8502A features a bi-directional Enable pin that allows the part to pull the enable pin low during fault detection.

PGOOD delay for ISL8502A has been decreased to 1ms typical (at 500kHz switching frequency) compared to 250ms (at 500kHz) for ISL8502.

KEY FEATURES

  • Up to 2A Continuous Output Current
  • Integrated MOSFETs for Small Regulator Footprint
  • Adjustable Switching Frequency, 500kHz to 1.2MHz
  • Tight Output Voltage Regulation, ±1% Over-temperature
  • Wide Input Voltage Range, 5V ±10% or 5.5V to 14V
  • Wide Output Voltage Range, from 0.6V
  • Simple Single-Loop Voltage-Mode PWM Control Design
  • Input Voltage Feed-Forward for Constant Modulator Gain
  • Fast PWM Converter Transient Response
  • Lossless rDS(ON) High Side and Low Side Overcurrent Protections
  • Undervoltage Detection
  • Integrated Thermal Shutdown Protection
  • Power-Good Indication
  • Adjustable Soft-Start
  • Start-Up with Pre-Bias Output
  • Pb-free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL8502A
Basic Information
Production Status
Mass Production
iSim Model
YES
# of Outputs
1
Topology [Rail 1]
Buck
Input Voltage Min (V) [Rail 1]
4.5
Input Voltage Max (V) [Rail 1]
14
Output Voltage Min (V) [Rail 1]
0.6
Output Voltage Max (V) [Rail 1]
14
Output Current Max (A) [Rail 1]
2
Switching Freq. (max) (MHz)
1.2
Switching Freq. (min) (MHz)
0.5
Max Duty Cycle (%)
See Datasheet
Qualification Level
Standard
Peak Efficiency (%)
95
POR
Yes
SYNCH Capability
Yes
Control Type
Voltage Mode
Switching Frequency Range (MHz)
0.5 to 1.2
Can Sample
YES
Temperature Range
-40 to +85

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Cross Reference

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Knowledge Base

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This webinar introduces three buck-boost regulators in QFN packages, ISL91127IR, ISL91107IR and ISL9120IR, for battery-powered portable devices.
3:57
This webinar introduces the ISL85003 and ISL85003A synchronous buck (step-down) regulators with integrated high-side and low-side FETs.
11:01
This webinar introduces the ISL78233, ISL78234 and ISL78235 automotive grade synchronous buck regulators for point-of-load applications.
3:02
Find out how the highly efficient, compact 12V synchronous buck regulator family can meet your power requirements for 12V rails.
9:50
This webinar introduces three buck-boost regulators in QFN packages, ISL91127IR, ISL91107IR and ISL9120IR, for battery-powered portable devices.
3:57
This webinar introduces the ISL85003 and ISL85003A synchronous buck (step-down) regulators with integrated high-side and low-side FETs.
11:01
This webinar introduces the ISL78233, ISL78234 and ISL78235 automotive grade synchronous buck regulators for point-of-load applications.
3:02
Find out how the highly efficient, compact 12V synchronous buck regulator family can meet your power requirements for 12V rails.
9:50
This webinar introduces three buck-boost regulators in QFN packages, ISL91127IR, ISL91107IR and ISL9120IR, for battery-powered portable devices.
3:57
This webinar introduces the ISL85003 and ISL85003A synchronous buck (step-down) regulators with integrated high-side and low-side FETs.
11:01
This webinar introduces the ISL78233, ISL78234 and ISL78235 automotive grade synchronous buck regulators for point-of-load applications.

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