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 = 3.4V, VOUT = 5V) (ISL91110IR only)
- Output current: up to 2A (PVIN = 2.5V, VOUT = 3.3V) (ISL91110 and ISL91110IR)
- Burst current: up to 3A (PVIN = 3V, VOUT = 3.3V, tON < 600μs, t = 4.6ms)
- High efficiency: up to 96%
- High efficiency: up to 95% (ISL91110IR only)
- 35μA quiescent current maximizes light- load efficiency
- 2.5MHz switching frequency minimizes external component size
- Fully protected for short-circuit, over-temperature, and undervoltage
- Small 2.33mmx2.07mm WLCSP (ISL91110 only)
- Small 4mmx4mm 20 Ld TQFN package (ISL91110IR only)
Description
ISL91110 and ISL91110IR are high-current buck-boost switching regulators for systems using new battery chemistries. They use Intersil’s proprietary buck-boost algorithm to maintain voltage regulation while providing excellent efficiency and very low output voltage ripple when the input voltage is close to the output voltage. ISL91110 and ISL91110IR are capable of delivering at least 2A continuous output current (VOUT = 3.3V) over a battery voltage range of 2.5V to 4.35V. This maximizes the energy utilization of advanced single-cell Li-ion battery chemistries that have significant capacity left at voltages below the system voltage. Their fully synchronous low ON-resistance 4-switch architecture and a low quiescent current of only 35μA optimize efficiency under all load conditions.
ISL91110 and ISL91110IR support standalone applications with a fixed 3.3V or 3.5V output voltage or adjustable output voltage with an external resistor divider. Output voltages as low as 1.0V or as high as 5.2V are supported. ISL91110 and ISL91110IR require only a single inductor and very few external components. Power supply solution size is minimized by its 2. 5MHz switching frequency, allowing small size external components.
The ISL91110 is available in a 25-bump, 0.4mm pitch WLCSP (2.33mm x 2.07mm) and the ISL91110IR is available in a 4mm x 4mm, 20 Ld TQFN package.
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) | 3 |
| Switching Frequency Range (Typical) (kHz) | 2100 - 2900 |
| Control Type | Current Mode |
| POR | Yes |
| SYNCH Capability | Yes |
| Peak Efficiency (%) | 96 |
| Qualification Level | Standard |
| Simulation Model Available | iSim |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| QFN | 4.0 x 4.0 x 0.90 | 20 | 0.5 |
| WLCSP-TKCURDLBC | 2.3 x 2.1 x 0.54 | 25 | 0.4 |
Applications
- Brownout free system voltage for smartphones and tablet PCs
- Wireless communication devices
- 2G/3G/4G RF power amplifiers
Renesas Boards & Kits
High-Current Buck-Boost Switching Regulator Evaluation Board
The ISL91110IIA-EVZ evaluation platform allows for quick evaluation of the high performance features of the ISL91110 buck-boost switching regulator. The ISL91110IIA-EVZ evaluates the ISL91110IIAZ featuring resistor programmable output voltage.
The ISL91110 is a high-current buck-boost switching... Read More
Support Communities
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ISL91110IRNZ-T7A Output
Hi, I am having trouble finding the fault in this circuit, I am expecting a 3.3V output though I am getting roughly 0.65V. For the input I have 4.2V (VBAT). Would you be able to help please? Thanks. I have used the reference circuitry as a guideline ...
Apr 3, 2023
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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Does the ISL91110 have reverse current protection which could protect the ISL91110 and the battery?
Question:We are using the ISL91110 as the power supply of an H-Bridge. A Lithium battery is connected at the buck-boost input. The H-Bridge can source unwanted current that will flow to the output of the buck-boost. Does the ISL91110 have reverse current protection which could ...
Support Communities
