ISL80031

3A Synchronous Buck Converter in 2x2 DFN Package

OVERVIEW

The ISL80030, ISL80030A, ISL80031, and ISL80031A are highly efficient, monolithic, synchronous step-down DC/DC converters that can deliver up to 3A of continuous output current from a 2.7V to 5.5V input supply. They use peak current mode control architecture to allow very low duty cycle operation. These devices operate at either a 1MHz or 2MHz switching frequency, thereby providing superior transient response and allowing for the use of small inductors. They also have excellent stability.

The ISL80030, ISL80030A, ISL80031, and ISL80031A integrate very low rDS(ON) MOSFETs to maximize efficiency. In addition, because the high-side MOSFET is a PMOS, the need for a Boot capacitor is eliminated, thereby reducing external component count. The devices can operate at 100% duty cycle.

The ISL80030 and ISL80030A are configured for PWM pulse width modulation operation and provide a fast transient response, which helps reduce the output noise and RF interference.

The ISL80031 and ISL80031A are configured for PFM discontinuous conduction operation and provide high efficiency by reducing switching losses at light loads.

These devices are offered in a space saving 8 Ld 2mmx2mm DFN Pb-free package with exposed pad for improved thermal performance. The complete converter occupies less than 64mm2 area.

KEY FEATURES

  • VIN range 2.7V to 5.5V
  • Up to 3A of output current
  • Switching frequency of 1MHz or 2MHz
  • 35μA quiescent current (ISL80031 and ISL80031A)
  • Overcurrent and short-circuit protection
  • Over-temperature/thermal protection
  • Negative current protection
  • Power-good and enable
  • 100% duty cycle
  • Internal soft-start and soft-stop
  • VIN undervoltage lockout and VOUT overvoltage protection
  • Up to 95% peak efficiency

PARAMETRICS

Parameters
ISL80031
Basic Information
Production Status
Mass Production
iSim Model
YES
Topology
Buck
# of Outputs
1
Input Voltage Min (V)
2.7
Input Voltage Max (V)
5.5
Output Voltage Min (V)
0.6
Output Voltage Max (V)
5.5
Output Current Max (A)
3
IQ
35 µA
Switching Freq. (max) (MHz)
1
Switching Freq. (min) (MHz)
1
Max Duty Cycle (%)
100
Qualification Level
Standard
Peak Efficiency (%)
95
POR
Yes
BOM Total Footprint (mm2)
64
SYNCH Capability
No
Control Type
Current Mode
Switching Frequency Range (MHz)
1 MHz
Can Sample
YES
Temperature Range
-40 to +125

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