Features
- Buck-boost charger for 2-, 3-, or 4-cell Li-ion batteries
- Input voltage range: 3.9V to 23.4V (no dead zone)
- Battery output voltage: 2.4V to 18.304V
- Autonomous charging option (with BFET configuration only)
- Passthrough mode in the forward direction
- Switching frequency up to 1MHz
- Adapter current and battery current monitoring (AMON/BMON)
- ALERT# open-drain output
- Trickle charging support for depleted batteries
- Reverse buck, boost, and buck-boost operation from the battery
- Battery ship mode option
- SMBus and auto-increment I2C compatibility
- 4mm × 4mm 32-lead TQFN package
Description
The RRB96838 is a buck-boost battery charger supporting input voltages up to 23.4V and battery voltages up to 18.3V. It can operate in direct battery charging mode without a battery FET or in narrow-voltage DC (NVDC) charging mode with a battery FET. Featuring advanced Renesas R3™ technology, it ensures highly efficient light-load operation and fast transient response.
For direct battery charging, the RRB96838 supports 2- to 4-cell batteries, making it ideal for applications such as power tools, portable vacuums, drones, robots, and power banks. As an NVDC charger, it regulates system output to a narrow voltage range, ensuring stable system bus voltage. In NVDC operation, system power can be sourced from the adapter, battery, or a combination of both.
The RRB96838 is compatible with a wide range of DC power sources, including USB Type-C® and USB Power Delivery (PD) adapters, and safely charges battery packs with up to four serially connected Li-ion cells. It also supports reverse buck, boost, and buck-boost operation, enabling power transfer from the battery to the input port. Additionally, the RRB96838 features SMBus and I2C serial communication, allowing programming of critical parameters for a fully customized solution.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Input Voltage (Min) (V) | 3.2 |
| Input Voltage (Max) (V) | 23.4 |
| Input Current Limit Accuracy (% (±)) | 2 |
| Battery Charge Voltage | 2-4 cell battery |
| Charging Voltage Accuracy (Max) (±%) | 0.5 |
| Battery Charge Voltage Adjustment | 8mV steps |
| Charge Current Limit Accuracy | ±2.5 (6A) |
| Trickle Charge Current Range | 64mA, 128mA, 256mA, or 512mA |
| Switching Frequency Range (Typical) (kHz) | 635 - 1000 |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TQFN | 4.0 x 4.0 x 0.70 | 32 | 0.4 |
Product Comparison
| RRB96838 | RAA489108 | |
| Input Voltage (Min) (V) | 3.2 | 3.9 |
| Input Voltage (Max) (V) | 23.4 | 30 |
| Input Current Limit Accuracy (% (±)) | 2 | 2 |
| Battery Charge Voltage | 2-4 cell battery | 2-4 cell battery |
| Charging Voltage Accuracy (Max) (±%) | 0.5 | 0.5 |
| Battery Charge Voltage Adjustment | 8mV steps | 8mV steps |
| Charge Current Limit Accuracy | ±2.5 (6A) | ±2.5 (6A) |
| Trickle Charge Current Range | 64mA, 128mA, 256mA, or 512mA | 64mA, 128mA, 256mA, or 512mA |
Application Block Diagrams
 | Bedside Monitor Power Supply Reliable power supply design with battery backup and isolated supplies for bedside monitoring systems. |
Additional Applications
- Power tools
- Portable vacuums
- Drones
- Power banks
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Renesas Boards & Kits
RRB96838 Buck-Boost Charger Evaluation Board
The RTKA96838DE0000BU evaluation board evaluates the performance of the RRB96838. The default value numbers of maximum and minimum output voltages, autonomous charging mode, and the adapter current limit charging function can be programmed by the resistor from the PROG pin to GND. The values can... Read More
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