ISL91127

High Efficiency Buck-Boost Regulator with 4.5A Switches

OVERVIEW

The ISL91127 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 ISL91127 can deliver at least 2.1A 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 ISL91127 supports stand-alone 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 1V or as high as 5.2V are supported.

The ISL91127 is available in a 20 bump, 0.4mm pitch WLCSP (2.15mmx1.74mm) with a 2.5MHz switching frequency, which further reduces the size of external components.

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
  • Continuous output current: up to 2.1A (PVIN = 2.5V, VOUTHigh efficiency: up to 96%
  • 30µA quiescent current maximizes light-load efficiency
  • 2.5MHz switching frequency minimizes external component size
  • Fully protected for short-circuit, over-temperature, and undervoltage
  • Small 2.15mmx1.74mm WLCSP

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL91127
Basic Information
生产状态
Mass Production
拓扑
Buck-Boost
输出数量
1
输入电压最小值 (V)
1.8
输入电压最大值 (V)
5.5
输出电压最小值 (V)
1
输出电压最大值 (V)
5.2
输出电流最大值 (A)
2.1
IQ
30 µA
开关频率 (最大值) (MHz)
2.9
开关频率 (最小值) (MHz)
2.1
最大占空比 (%)
-
资质级别
Standard
峰值效率 (%)
96
POR
Yes
SYNCH功能
No
开关频率范围 (MHz)
2.5
CAN 采样
YES
温度范围
-40 to +85

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