Features
- Wide Vin operating range from 4.5V to 75V
- Adjustable Vout from 0.8V to ~90% of Vin
- Up to 3A of continuous output current
- Default 400kHz or adjustable switching frequency from 200kHz to 800kHz
- ±1% load regulation accuracy from -40°C to 125°C, ±0.5% load regulation accuracy at 25°C
- 90μA typical quiescent current
- Internal compensation, fixed 0.5ms SS for QFN and adjustable SS for HTSSOP
- PFM operation at light load with integrated external bias LDO & Power Good indicator
- Cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection and thermal shut down
Description
The RAA211835 is a DC/DC asynchronous step-down (Buck) regulator that supports a 4.5V to 75V input voltage range and adjustable output voltage. It can deliver up to continuous 3A of continuous output current with premium load and line regulation performance.
The RAA211835 uses peak-current mode control architecture. Its PWM switching frequency is programmable to provide the best trade-off between transient response and efficiency. It also supports PFM operation to maximize light load efficiency, in addition to an external bias LDO input to further reduce power dissipation across the load range. The regulator also has an internal loop compensation circuit to reduce the external component count and BOM cost.
The RAA211835 provides useful functions such as internal or programmable soft-start and power good indicator. For safe operation, the RAA211835 also offers protection features such as cycle-by-cycle peak and valley current limit, input voltage UVLO, output voltage undervoltage (short-circuit) protection, and thermal shutdown.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck |
| Outputs (#) | 1 |
| Input Voltage (Min) [Rail 1] (V) | 4.5 |
| Input Voltage (Max) [Rail 1] (V) | 75 - 75 |
| Output Voltage (Min) [Rail 1] (V) | 0.8 |
| Output Voltage (Max) [Rail 1] (V) | 65 |
| Output Current (Max) [Rail 1] (A) | 3 |
| Switching Frequency Range (Typical) (kHz) | 200 - 800 |
| Control Type | Peak Current Mode |
| Peak Efficiency (%) | 87 |
| IQ [Rail 1] (µA) | 90 |
| SYNCH Capability | No |
| Qualification Level | Standard |
| Temp. Range (°C) | -40 to +125°C |
| Simulation Model Available | iSim |
Application Block Diagrams
 | Humanoid Battery Management System Integrated humanoid robot BMS enabling safe, real-time power management, protection, and battery-state control. |
 | Electronic Toll with GNSS ETC systems automate toll payments to reduce traffic and eliminate manual toll booth delays. |
Additional Applications
- Up to 75V distributed power supplies & general purposes POL
- Telecommunication base station power supplies
- Power tools
- Surveillance
- Portable mobility/robotic devices
- Industrial power systems
Complete Your Design
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Renesas Boards & Kits
RAA211835 Synchronous Buck Evaluation Board with 4.5V to 75V Input Range, 3.3V 3A Output (QFN version)
The RTKA211835DE0000BU board demonstrates and quickly evaluates the RAA211835 (QFN version), a DC/DC asynchronous step-down regulator with programmable switching frequency. The RAA211835 supports a wide input voltage range (from 4.5V to 75V) and adjustable output voltage. It can deliver up to... Read More
RAA211835 Synchronous Buck Evaluation Board with 4.5V to 75V Input Range, 3.3V 3A Output (HTSSOP version)
The RTKA211835DE0010BU board demonstrates and quickly evaluates the RAA211835 (HTSSOP version), a DC/DC asynchronous step-down regulator with programmable switching frequency. The RAA211835 supports a wide input voltage range (from 4.5V to 75V) and adjustable output voltage. It can deliver up to... Read More
Support Communities
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Buck Converter Short Circuit issue RAA211835GSP#HA0
We are using your product, RAA211835GSP#HA0, in our design with the following components: Inductor: 22µH, 4A Schottky Diode: 60V, 4A Switching Frequency (fSW): 200kHz Input Supply Voltage: 58VDC Issue: When we short the 5V output of the buck converter to ground, the buck converter gets damaged due to ...
Mar 19, 2025 -
Buck Converter Short Circuit issue RAA211835GSP#HA0
We are using your product, RAA211835GSP#HA0, in our design with the following components: Inductor: 22µH, 4A Schottky Diode: 60V, 4A Switching Frequency (fSW): 200kHz Input Supply Voltage: 58VDC Issue: When we short the 5V output of the buck converter to ground, the buck converter gets damaged due to ...
Mar 19, 2025
Support Communities
