ISL91107

High Efficiency Buck-boost Regulators

OVERVIEW

The ISL91107 and ISL91107IR are highly-integrated buck-boost switching regulators that accept input voltages either above or below the regulated output voltage. Unlike other buck-boost regulators, these regulators automatically transition between operating modes without significant output disturbance.

These devices are capable of delivering up to 2A of output current (PVIN = 2.8V, VOUT = 3.3V) and provide excellent efficiency due to their fully synchronous 4-switch architecture. No-load quiescent current of only 45μA also optimizes efficiency under light-load conditions.

The ISL91107 and ISL91107IR are designed for standalone applications and support 3.3V fixed output voltages or variable output voltages with an external resistor divider. Output voltages as low as 1V or as high as 5.2V are supported using an external resistor divider.

The ISL91107 and ISL91107IR require only a single inductor and very few external components. Power supply solution size is minimized by their 2.5MHz switching frequency, allowing small size external components.

The ISL91107IR is available in a 3x4 20 Ld TQFN package and the ISL91107 is available in a 2.15mmx1.51mm WLCSP package.

KEY FEATURES

  • Accepts input voltages above or below regulated output voltage
  • Automatic and seamless transitions between buck and boost modes
  • Input voltage range: 1.8V to 5.5V
  • Output current: up to 2A (PVIN = 2.8V, VOUT = 3.3V)
  • High efficiency: up to 96%
  • 45μA quiescent current maximizes light load efficiency
  • 2.5MHz switching frequency minimizes external component size
  • Selectable forced PWM mode
  • Fully protected for short-circuit, over-temperature and undervoltage
  • Small 2.15mmx1.51mm WLCSP (ISL91107)
  • Small 3mmx4mm TQFN package (ISL91107IR)

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL91107
Basic Information
Production Status
Mass Production
Topology
Buck-Boost
# of Outputs
1
Input Voltage Min (V)
1.8
Input Voltage Max (V)
5.5
Output Voltage Min (V)
1
Output Voltage Max (V)
5.2
Output Current Max (A)
2
IQ
45 µA
Switching Freq. (max) (MHz)
2.75
Switching Freq. (min) (MHz)
2.25
Max Duty Cycle (%)
-
Qualification Level
Standard
Peak Efficiency (%)
96
POR
Yes
SYNCH Capability
No
Control Type
Current Mode
Switching Frequency Range (MHz)
2.25 to 2.75MHz
Can Sample
YES
Temperature Range
-40 to +85

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