Features
- Accepts input voltages above or below regulated output voltage
- Automatic and seamless transitions between Buck and Boost modes
- I2C interface
- Input voltage range: 1.8V to 5.5V
- Continuous output current: up to 2.4A (PVIN = 2.5V, VOUT = 3.3V)
- High efficiency: up to 96%
- 30µA quiescent current maximizes light-load efficiency
- Selectable bypass power saving mode operation
- 2.5MHz switching frequency minimizes the external component size
- Fully protected from short-circuit, over-temperature, and undervoltage
- Small 2.15mm x 1.74mm WLCSP
Description
The ISL91128 is a high-current, buck-boost switching regulator for systems using new battery chemistries. It uses the Renesas 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. The device also includes a selectable Bypass mode for low power consumption in applications that have a Sleep or Low Power mode.
The ISL91128 is capable of delivering at least 2.2A continuous output current (VOUT = 3.3V) across 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. Its fully synchronous low ON-resistance 4-switch architecture and a low quiescent current of only 30µA optimize efficiency under all load conditions.
The ISL91128 supports a broader set of programmable features that can be accessed using an I2C bus interface. With a programmable output voltage range of 1.9V to 5.0V, the ISL91128 is ideal for applications requiring dynamically changing supply voltages. A programmable slew rate can be selected to provide smooth transitions between output voltage settings.
The ISL91128 is available in a 20-bump, 0.4mm pitch WLCSP (2.15mm x 1.74mm) with 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) | 1.9 |
| Output Voltage (Max) [Rail 1] (V) | 5 |
| Output Current (Max) [Rail 1] (A) | 3 |
| IQ [Rail 1] (µA) | 30 |
| Switching Frequency Range (Typical) (kHz) | 2500 - 2500 |
| POR | Yes |
| SYNCH Capability | No |
| Peak Efficiency (%) | 96 |
| Qualification Level | Standard |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| WLCSP-TKCURDL | 2.1 x 1.7 x 0.50 | 20 | 0.4 |
Applications
- Brownout-free system voltage for smart phones and tablet PCs
- Wireless communication devices
- 2G/3G/4G RF power amplifiers