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

PARAMETRICS

Parameters
ISL91127
Basic Information
Production Status
量産中
トポロジ
Buck-Boost
出力数
1
入力電圧 (V) (min)
1.8
入力電圧 (V) (max)
5.5
出力電圧 (V) (min)
1
出力電圧 (V) (max)
5.2
出力電流 (A) (max)
2.1
IQ
30 µA
スイッチング周波数 (max) (MHz)
2.9
スイッチング周波数 (min) (MHz)
2.1
最大デューティサイクル (%)
-
認定レベル
Standard
ピーク効率 (%)
96
POR
Yes
SYNCH機能
No
スイッチング周波数範囲 (MHz)
2.5
CANサンプル
YES
温度範囲
-40 to +85

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