ISL9238

Buck-Boost Narrow VDC Battery Charger with SMBus Interface and USB OTG

Product Status: Mass Production

OVERVIEW

The ISL9238 is a buck-boost Narrow Output Voltage DC (NVDC) charger. The ISL9238 provides the NVDC charging, system bus regulation and protection features for tablet, Ultrabook, notebook, power bank, and any USB-C interface platform. The advanced Renesas R3™ Technology provides high light-load efficiency and fast transient response.

In Charging mode, the ISL9238 takes input power from a wide range of DC power sources (such as conventional AC/DC charger adapters, USB PD ports, and travel adapters) and safely charges battery packs with up to 4-series cell Li-ion batteries.

As a NVDC topology charger, it also regulates the system output to a narrow DC range for stable system bus voltage. The system power can be provided from the adapter, battery, or a combination of both. The ISL9238 can operate with only a battery, only an adapter, or both connected. For Intel IMVP8 compliant systems the ISL9238 includes System Power monitor (PSYS) functionality, which provides an analog signal representing total platform power. The PSYS output connects to a wide range of IMVP8 core regulators to provide an IMVP8 compliant power domain function.

The ISL9238 supports reverse buck, boost, or buck-boost operation to input port from 2- to 4-cell batteries.

The ISL9238 has serial communication using SMBus/I2C that allows programming of many critical parameters to deliver a customized solution.

KEY FEATURES

  • Buck-boost NVDC charger for 1-, 2-, 3-, or 4-cell Li-ion batteries
  • Input voltage range 3.2V to 23.4V (no dead zone)
  • System output voltage 2.4V to 18.304V
  • Autonomous charging option (automatic end of charging)
  • System power monitor PSYS output, IMVP compliant
  • Up to 1MHz switching frequency
  • Adapter current and battery current monitor (AMON/BMON)
  • PROCHOT# open-drain output, IMVP compliant
  • Allows trickle charging of depleted battery
  • Ideal diode control in Turbo mode
  • Reverse buck, boost, and buck-boost operation from battery
  • Two-level adapter current limit available
  • Battery Ship mode option
  • SMBus and auto-increment I2C compatible
  • 4x4 32 Ld TQFN package
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    APPLICATIONS

  • 1 to 4-cell tablet, Ultrabook, notebook, power bank, and any USB-C interface portable device requiring batteries

BLOCK DIAGRAM

 Block Diagram

PARAMETRICS

Parameters
ISL9238
Basic Information
生产状态
Mass Production
输入电压最小值 (V)
3.2
输入电压最大值 (V)
23.4
电池充电电压 (V)
2.4 to 18.304
充电电压精度最大值 (%)
±0.5
电池充电电压调节 (%)
8mV steps
充电限流精度 (%)
±3
涓流充电限流精度 (%)
64mA, 128mA, 256mA, or 512mA
自动电源选择
Yes
直流适配器检测
Yes
拓扑
R3 modulator
开关频率典型值 (kHz)
733 or 1000
最大占空比 (%)
100
听觉噪音
No
热关断 (°C)
150 °C
电池化学物品
Multi-Cell Li+/Polymer
资质级别
Standard
输入电压范围 (V)
3.2 to 23.4
CAN 采样
YES
温度范围
-40 to +100

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