ISL8502

2A Synchronous Buck Regulator with Integrated MOSFETs

OVERVIEW

The ISL8502 is a synchronous buck controller with internal MOSFETs packaged in a small 4mmx4mm QFN package. The ISL8502 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 ISL8502 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 ISL8502 features a bi-directional Enable pin that allows the part to pull the enable pin low during fault detection.

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 Protection
  • 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
ISL8502
Basic Information
Production Status
Mass Production
iSim Model
YES
Topology
Buck
# of Outputs
1
Input Voltage Min (V)
4.5
Input Voltage Max (V)
14
Output Voltage Min (V)
0.6
Output Voltage Max (V)
14
Output Current Max (A)
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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