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 1.2A
- High Efficiency: Up to 95%
- 35µA Quiescent Current Maximizes Light-load Efficiency
- 2.5MHz Switching Frequency Minimizes External Component Size
- Selectable Forced-PWM Mode and External Synchronization
- I2C Interface (ISL9112)
- Fully Protected for Overcurrent, Over-temperature and Undervoltage
- Small 3mmx3mm TDFN Package
Description
The ISL9110 and ISL9112 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.
Both parts are capable of delivering up to 1.2A output current, and provide excellent efficiency due to their fully synchronous 4-switch architecture. No-load quiescent current of only 35µA also optimizes efficiency under light-load conditions. Forced PWM and/or synchronization to an external clock may also be selected for noise sensitive applications.
The ISL9110 is designed for standalone applications and supports 3.3V and 5V 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 ISL9110 and ISL9112 require only a single inductor and very few external components. Power supply solution size is minimized by a tiny 3mmx3mm package and a 2.5MHz switching frequency, which further reduces the size of external components.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 1.8 |
| Input Voltage (Max) [Rail 1] (V) | 5.5 - 5.5 |
| Output Voltage (Min) [Rail 1] (V) | 1 |
| Output Voltage (Max) [Rail 1] (V) | 5.2 |
| Output Current (Max) [Rail 1] (A) | 1.2 |
| IQ [Rail 1] (µA) | 35 |
| Switching Frequency Range (Typical) (kHz) | 2500 - 2500 |
| Control Type | Current Mode |
| POR | Yes |
| SYNCH Capability | Yes |
| Peak Efficiency (%) | 95 |
| BOM Total Footprint (mm2) | 9 |
| Qualification Level | Standard |
| Simulation Model Available | iSim |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TDFN | 3.0 x 3.0 x 0.75 | 12 | 0.4 |
Application Block Diagrams
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Additional Applications
- Regulated 33V from a Single Li-Ion Battery
- Smart Phones and Tablet Computers
- Handheld Devices
- Point-of-Load Regulators
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Support Communities
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ISL91107IRTNZ-T7A
hi, Iam Using ISL91107IRTNZ-T7A converter for converting Vbat voltage (2.7 to 4.2V) to 3.3V output. I have used an charger IC to charge the 1s1p lipo battery. When the battery is deeply discharged and enters to the shutdown mode, the charger could not able to charge ...
Feb 27, 2025 -
ISL91107IRTNZ-T7A
hi, Iam Using ISL91107IRTNZ-T7A converter for converting Vbat voltage (2.7 to 4.2V) to 3.3V output. I have used an charger IC to charge the 1s1p lipo battery. When the battery is deeply discharged and enters to the shutdown mode, the charger could not able to charge ...
Feb 27, 2025
Knowledge Base
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Which is the best option between ISL91108 and ISL91110 for a high current buck-boost application?
Question:Between ISL91108 and ISL91110, which is the best option for a high current buck-boost application? Are they pin compatible? Answer: It depends on the maximum load current requirement of the application. ISL91108 can deliver 1.5A in boost mode (PVIN=3V, VOUT=3.3V). ISL91110 can deliver up ...
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Can different inductor values/sizes be used with ISL91108/ISL91110 other than the ones recommended on the datasheet?
Question:Can different inductor values/sizes be used with ISL91108/ISL91110 other than the ones recommended on the datasheet? Answer:1uH inductors of other sizes can be used as long as the saturation current ratings meet the datasheet recommendation. Note that the efficiency and transient performance may be ...
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What is the limiting current limiting factor for output current capability for ISL91108, ISL91110 and ISL91117?
Question:What is the limiting factor for output current capability? Answer:It depends on application circuit, input voltage and output voltage. Usually in buck-mode of operation, the inductor peak current limit is the limiting factor. In boost and buck-boost mode of operation, the typical cause is the intrinsic ...
Support Communities
