Features
- Bidirectional buck, boost, and buck-boost operation
- Input voltage range: 3.9V to 55V (no dead zone)
- Output voltage: 2.4V to 55V
- Passthrough mode in the forward direction
- Adapter current and battery current monitoring (AMON/BMON)
- Battery charging support
- Forward and reverse sleep modes
- 4mm × 4mm 32-lead TQFN package compatible with the ISL9238, RAA489108, and RAA489118 parts
Description
The RRB86848 is a bidirectional buck-boost voltage regulator designed for power tools, portable vacuums, lawn mowers, and additional system bus regulation for notebooks. It provides protection features and supports any USB-C interface platform, including USB Power Delivery (PD) Extended Power Range (EPR). The advanced Renesas R3™ technology ensures highly efficient light-load operation and fast transient response.
This regulator accepts input power from a wide range of DC power sources, such as AC/DC adapters, USB PD ports, and travel adapters, and safely converts it to a regulated voltage. It also supports reverse operation, converting a wide-range DC power source at the output to a regulated voltage at the input, offering flexibility for diverse applications.
The RRB86848 offers programming resistor options to set output voltage, adapter current limits, and output current limits. Additionally, its serial communication interface allows programming of critical parameters, enabling a fully customized solution.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck-Boost |
| Outputs (#) | 1 |
| Input Voltage (Min) (V) | 3.9 |
| Input Voltage (Max) (V) | 55 |
| Output Voltage (Min) (V) | 2.4 |
| Output Voltage (Max) (V) | 55 |
| Quiescent Current | 50 µA |
| Switching Frequency Range (Typical) (kHz) | 377 - 948 |
| SYNCH Capability | No |
| Parallelable | No |
| Bi-direction | Yes |
| Control Type | Hysteretic Mode |
| Temp. Range (°C) | -10 to +100°C, -40 to +100°C |
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
| RRB86848 | RAA489800 | |
| Input Voltage (Min) (V) | 3.9 | 3.8 |
| Input Voltage (Max) (V) | 55 | 23 |
| Output Voltage (Min) (V) | 2.4 | 2 |
| Output Voltage (Max) (V) | 55 | 21 |
| Switching Frequency Range (Typical) | 377 - 948 | 620 - 1000 |
Application Block Diagrams
 | 140W-240W Dual Ports USB Type-C & USB PD Charger This USB charger system delivers up to 240W for fast, flexible dual USB-C charging with robust safety. |
Additional Applications
- Voltage regulation for docking stations and other applications using USB-C EPR inputs or outputs
- Battery charging for lawn mowers and other lawn tools, e-bikes, power tools, and power banks
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Support Communities
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RRB86848 bidirectional boost configuration for 48V battery charging
Hello! I have a battery system of 48V (Vout) and I want to charge/discharge it using the RRB86848 converter. My input voltage is 5-20V. My questions are: 1. Is it possible to configure the converter population in boost mode? i.e populating only the 2 FETs on ...
Oct 3, 2025
Support Communities
