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Buck-Boost Narrow VDC Battery Charger for Power Bank Application with SMBus Interface and USB OTG


The ISL95538B is a buck-boost Narrow Output Voltage DC (NVDC) charger. The ISL95538B provides the NVDC charging function, system bus regulation, and protection features for tablet, Ultrabook, and notebook platforms. The advanced Renesas R3™ Technology provides high light-load efficiency and fast transient response.

In Charging mode, the ISL95538B takes input power from a wide range of DC power sources (such as conventional AC/DC charger adapters, USB PD ports, travel adapters) and safely charges battery packs with up to 4-series cell Li-ion batteries.

As an NVDC topology charger, the ISL95538B 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 ISL95538B can operate with only a battery, an adapter, or both connected.

The ISL95538B supports reverse buck, boost, or buck-boost operation to the input port from 2- to 4-cell batteries.

The ISL95538B has serial communication using SMBus/I2C that allows programming of many critical parameters to deliver a customized solution.


    • 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 3V to 18.304V
    • Autonomous charging option (automatic end of charge and recharge)
    • Up to 1MHz switching frequency
    • Adapter current and battery current monitor (AMON/BMON)
    • PROCHOT# open-drain output, IMVP compliant
    • Allows trickle charging of depleted batteries
    • 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
    • 4 x 4 32 Ld TQFN package


 Block Diagram


Basic Information
Production Status
Mass Production
Input Voltage Min (V)
Input Voltage Max (V)
Battery Charge Voltage (V)
3 to 18.304
Charging Voltage Accuracy Max (%)
Battery Charge Voltage Adjust (%)
8mV steps
Charge Current Limit Accuracy (%)
Trickle Charge Current Limit Accuracy (%)
64mA, 128mA, 256mA, or 512mA
Automatic Power Source Selection
DC Adapter Detection
R3 modulator
Switching Frequency Typ (kHz)
733 or 1000
Max Duty Cycle (%)
Audible Noise
Thermal Shutdown (°C)
150 °C
Battery Chemistry
Multi-Cell Li+/Polymer
Qualification Level
Input Voltage Range (V)
3.2 to 23.4
Can Sample
Temperature Range
-40 to +100

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