OVERVIEW

The ISL85410 is a 1A synchronous buck regulator with an input range of 3V to 40V. It provides an easy to use, high efficiency low BOM count solution for a variety of applications.

The ISL85410 integrates both high-side and low-side NMOS FETs and features a PFM mode for improved efficiency at light loads. This feature can be disabled if a forced PWM mode is desired. The part switches at a default frequency of 500kHz but may also be programmed using an external resistor from 300kHz to 2MHz. The ISL85410 has the ability to utilize internal or external compensation. By integrating both NMOS devices and providing internal configuration options, minimal external components are required, reducing BOM count and complexity of design.

With the wide VIN range and reduced BOM, the part provides an easy to implement design solution for a variety of applications while giving superior performance. It will provide a very robust design for high voltage industrial applications as well as an efficient solution for battery powered applications.

The part is available in a small Pb-free 4mmx3mm DFN plastic package with a full-range industrial temperature of -40°C to +125°C.

KEY FEATURES

  • Wide input voltage range 3V to 40V
  • Synchronous operation for high efficiency
  • No compensation required
  • Integrated high-side and low-side NMOS devices
  • Selectable PFM or forced PWM mode at light loads
  • Internal fixed (500kHz) or adjustable switching frequency 300kHz to 2MHz
  • Continuous output current up to 1A
  • Internal or external soft-start
  • Minimal external components required
  • Power-good and enable functions available

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL85410
Topology
Buck
Max Duty Cycle (%)
See Datasheet
# of Outputs
1
Qualification Level
Standard
Input Voltage Min (V)
3
Peak Efficiency (%)
94
Input Voltage Max (V)
40
POR
Yes
Output Voltage Min (V)
0.6
SYNCH Capability
Yes
Output Voltage Max (V)
34
Control Type
Current Mode
Output Current Max (A)
1
Switching Frequency Range (MHz)
0.3 to 2.0
IQ
80 µA
Can Sample
YES
Switching Freq. (max) (MHz)
2
Temperature Range
-40 to +125
Switching Freq. (min) (MHz)
0.3

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