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Narrow VDC (NVDC) Battery Charger with SMBus Interface

Product Status: Mass Production


The ISL88750 is a highly versatile Narrow VDC (NVDC) battery charger, supporting 2-, 3- or 4-cell batteries. It allows the battery to work with the adapter together to supply the system load when it exceeds the adapter capability, referred to as system Turbo mode. ISL88750 quickly turns on BGATE to enable the battery to help the adapter provide the system power in Turbo mode.

The ISL88750 uses N-channel MOSFETs (NFETs) for all the switches to achieve the best performance and lowest BOM cost. The internal charge pump is capable of turning on all the NFETs fast or slow depending on the circumstance or the need. The ability to quickly turn on NFETs prevents system bus voltage drop when the battery is suddenly removed in Turbo mode or in Battery Learn mode.

The ISL88750 features hardware based adapter current limit and battery-current limit in addition to SMBus programmable limits.

The ISL88750 provides a high accuracy adapter current monitor and battery discharging current monitor outputs. To provide maximum flexibility for working with high power and low power systems, it provides several configurable current-sense resistor value options to achieve the best trade-off of current sensing accuracy vs power loss.

The ISL88750 uses the Renesas patented Robust Ripple Regulator (R3™) modulation scheme to provide excellent light-load efficiency and fast dynamic response. It is available in a 32 Ld 4x4mm2 QFN package.


  • Adapter current monitor and battery discharging current monitor
  • Uses NFET for all the switches
    • Supports removal of battery during Battery Learn mode
    • Actively controlled inrush current to prevent FET damage
  • SMBus programmable settings and high accuracy
  • Comprehensive protection features include
    • Hardware-based adapter current and battery current limits
    • Supports sudden removal of battery in system Turbo mode
  • 16 switching frequency options from 350kHz to 1MHz
  • Low quiescent current
  • SMBus and auto-increment I2C compatible
  • Renesas Robust Ripple Regulator (R3™) modulation scheme provides excellent light-load efficiency and fast dynamic response
  • 32 Ld 4x4mm2 QFN package
  • Pb-free (RoHS compliant)



  • Devices with rechargeable 2-, 3- or 4-cell batteries


 Block Diagram


Basic Information
Production Status
Mass Production
Input Voltage Min (V)
Input Voltage Max (V)
Input Current Limit Accuracy (%)
Battery Charge Voltage (V)
1.024 to 19.2 in 16mV Steps
Charging Voltage Accuracy Max (%)
Battery Charge Voltage Adjust (%)
16mV steps
Charge Current Limit Accuracy (%)
Trickle Charge Current Limit Accuracy (%)
64mA to 220mA
Automatic Trickle Charge Typ (V)
Battery Leakage Current Max (μA)
2 (DCIN=0V, No System Load)
Automatic Power Source Selection
No (Set by Host)
DC Adapter Detection
No (Set by Host)
Fixed Frequency Synchronous Buck
Switching Frequency Typ (kHz)
Max Duty Cycle (%)
Audible Noise
Thermal Shutdown (°C)
150 °C
Battery Chemistry
Multi-Cell Li+/Polymer
Qualification Level
Input Voltage Range (V)
8 to 22
Can Sample
Temperature Range
0 to +70

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