ISL6520A

Single Synchronous Buck Pulse-Width Modulation (PWM) controller

Product Status: Mass Production(*)

OVERVIEW

The ISL6520A makes simple work out of implementing a complete control and protection scheme for a DC/DC stepdown converter. Designed to drive N-Channel MOSFETs in a synchronous buck topology, the ISL6520A integrates the control, output adjustment, monitoring and protection functions into a single 8 Lead package.

The ISL6520A provides simple, single feedback loop, voltage-mode control with fast transient response. The output voltage can be precisely regulated to as low as 0.8V, with a maximum tolerance of ±1.5% over-temperature and line voltage variations. A fixed frequency oscillator reduces design complexity, while balancing typical application cost and efficiency.

The error amplifier features a 15MHz gain-bandwidth product and 8V/ms slew rate which enables high converter bandwidth for fast transient performance. The resulting PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by monitoring the rDS(ON) of the upper MOSFET to inhibit PWM operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor.

KEY FEATURES

  • Operates from +5V Input
  • 0.8V to VIN Output Range
  • 0.8V Internal Reference
  • ±1.5% Over Line Voltage and Temperature
  • Drives N-Channel MOSFETs
  • Simple Single-Loop Control Design
  • Voltage-Mode PWM Control
  • Fast Transient Response
  • High-Bandwidth Error Amplifier
  • Full 0% to 100% Duty Cycle
  • Lossless, Programmable Overcurrent Protection
  • Uses Upper MOSFET's rDS(ON)
  • Small Converter Size
  • 300kHz Fixed Frequency Oscillator
  • Internal Soft-Start
  • 8 Ld SOIC or 16 Ld 4mmx4mm QFN
  • QFN Package:
  • Compliant to JEDEC PUB95 MO-220 QFN - Quad Flat No Leads - Package Outline
  • Near Chip Scale Package footprint, which improves PCB efficiency and has a thinner profile
  • Pb-Free (RoHS Compliant)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL6520A
Basic Information
Production Status
Mass Production(*)
Input Voltage Min (V)
2.5
Input Voltage Max (V)
5
Output Voltage Min (V)
0.8
Output Voltage Max (V)
5
Output Current Max (A)
20
VBIAS (min)
5 V
VBIAS (max) (V)
5
IS (typ)
3.2 mA
Qualification Level
Standard
Bias Voltage Range (V)
5
Can Sample
YES
Temperature Range
0 to +70

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