Industry's First USB-C Buck-Boost Battery Charger
Intersil’s new ISL9237 buck-boost battery charger supports two-way power delivery using the reversible USB Type-C™ connector.
The single-chip ISL9237 NVDC battery charger replaces two-chip buck and boost charger solutions, eliminating a charger IC and inductor to reduce BOM costs by up to 40%.
- Buck-boost NVDC charger for 1-, 2- or 3-cell Li-ion batteries
- Input voltage range 3.2V to 23.4V (no dead zone)
- System output voltage 2.4V to 13.824V
- System power monitor PSYS output, IMVP-8 compliant
- Up to 1MHz switching frequency
- LDO output for charger VDD
- Adapter current monitor (AMON)
- Battery discharging current monitor (BMON)
- PROCHOT# open-drain output, IMVP-8 compliant
- Allows trickle charging of depleted battery
- Optional ASGATE FET control
- Ideal diode control in Turbo mode
- Supports OTG function for 2- and 3-cell batteries
- SMBus and auto-increment I2C compatible
- Two-level adapter current limit available
- Pb-free (RoHS compliant)
- Package 4x4 32 Ld QFN
The ISL9237 is a buck-boost Narrow Output Voltage DC (NVDC) charger utilizing Intersil’s advanced R3™ Technology to provide high light-load efficiency, fast transient response and seamless DCM/CCM transitions for a variety of mobile and industrial applications.
In Charge mode, the ISL9237 takes input power from a wide range of DC power sources (conventional AC/DC charger adapters, USB PD ports, travel adapters, etc.) and safely charges battery packs with up to 3 cells in a series configuration.
ISL9237 supports On-the-Go (OTG) function for 2- and 3-cell battery applications. When OTG function is enabled, the ISL9237 operates in the reverse Buck mode to provide 5V at the USB port.
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 ISL9237 can operate with only a battery, only an adapter or both connected. For Intel IMVP8 compliant systems, the ISL9237 includes PSYS functionality, which provides an analog signal representing total platform power. The PSYS output will connect to a wide range of Intersil IMVP8 core regulators to provide an IMVP8 compliant power domain function.
The ISL9237 has serial communication via SMBus/I2C that allows programming of many critical parameters to deliver a customized solution. These programming parameters include, but are not limited to: Adapter current limit, charger current limit, system voltage setting and trickle charging current limit.
- Mobile devices with rechargeable batteries
- Industrial devices with rechargeable batteries
|VIN (min) (V)||3.2||7||7||7|
|VIN (max) (V)||23.4||25||25||25|
|Battery Charge Voltage (V)||2.4 to 13.824||2.7 to 19.2 in 16mV Steps||2.7 to 19.2 in 16mV Steps||2.7 to 19.2 in 16mV Steps|
|Charging Voltage Accuracy Max (%)||±0.5||±0.5||±0.5||±0.5|
|Battery Charge Voltage Adjust (%)||8mV steps||16mV steps||16mV steps||16mV steps|
|Charge Current Limit Accuracy (%)||±3||±3||±3||±3|
|Trickle Charge Current Limit Accuracy (%)||64mA, 128mA, 256mA, or 512mA||64mA to 220mA||64mA to 220mA||64mA to 220mA|
|Automatic Power Source Selection||Yes||No (Set by Host)||No (Set by Host)||No (Set by Host)|
|DC Adapter Detection||Yes||No (Set by Host)||No (Set by Host)||No (Set by Host)|
|Topology||R3 modulator||Fixed Frequency Synchronous Buck||Fixed Frequency Synchronous Buck||Fixed Frequency Synchronous Buck|
|Switching Frequency (typ) (kHz)||733 or 1000||400||400||400|
|Max Duty Cycle (%)||100||99.9||99.9||99.9|
|Thermal Shutdown (°C)||150 °C||150 °C||150 °C||150 °C|
|Battery Chemistry||Multi-Cell Li+/Polymer||Multi-Cell Li+/Polymer||Multi-Cell Li+/Polymer||Multi-Cell Li+/Polymer|
|AN1975: Use of Optocouplers in Battery Management Systems|
Use of Optocouplers in Battery Management Systems
09 Aug 2016
|09 Aug 2016||174 KB|
Buck-Boost Narrow VDC Battery Charger with SMBus Interface and USB OTG
07 Jul 2016
|07 Jul 2016||858 KB|
|ISL9237EVAL2Z Design Files|
BOM, Artwork and Schematic Files for the ISL9237EVAL2Z Evaluation Board
|ISL9237EVAL2Z Software Driver|
Unsigned Windows USB driver required for ISL9237EVAL2Z GUI software. Save this .inf file, right click and select “install” to install driver.
|ISL9237EVAL2Z User Guide|
ISL9237EVAL2Z Evaluation Board User Guide
20 Jul 2016
|20 Jul 2016||1.62 MB|
|Understanding USB-C Buck-Boost Battery Charging|
11 Feb 2016
|11 Feb 2016||329 KB|