特性
- 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
- Fully Protected from Overcurrent, Over-temperature, and Undervoltage
- Small 3mm x 3mm TDFN Package
描述
The ISL9112 is a highly integrated buck-boost switching regulator that accepts input voltages either above or below the regulated output voltage. Unlike other buck-boost regulators, this regulator automatically transitions between operating modes without significant output disturbance.
The device is capable of delivering up to 1.2A output current and provides excellent efficiency due to its fully synchronous 4-switch architecture. A 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 ISL9112 supports a broader set of programmable features that may be accessed via an I2C bus interface. With a programmable output voltage range of 1.9V to 5V, the ISL9112 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 device requires only a single inductor and very few external components. A power supply solution size is minimized by a tiny 3mm x 3mm package and a 2.5MHz switching frequency, which further reduces the size of external components.
产品参数
| 属性 | 值 |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 1.8 |
| Input Voltage (Max) [Rail 1] | 5.5 |
| Output Voltage (Min) [Rail 1] (V) | 1.9 |
| Output Voltage (Max) [Rail 1] (V) | 5 |
| 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 |
封装选项
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TDFN | 3.0 x 3.0 x 0.75 | 12 | 0.4 |
应用
- Regulated 33V from a Single Li-Ion Battery
- Smart Phones and Tablet Computers
- Handheld Devices
- Point-of-Load Regulators
