Features
- Wide Vin operating range from 4.5V to 42V
- Adjustable Vout from 0.8V to ~90% of Vin
- Up to 5A 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
- 95μA typical quiescent current
- Internal compensation, fixed 0.5ms SS for QFN and adjustable SS for HTSSOP
- PFM operation and DEM 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 RAA211450 is a DC/DC synchronous step-down (Buck) regulator that supports a 4.5V to 42V input voltage range and adjustable output voltage. It can deliver up to continuous 5A of continuous output current with premium load and line regulation performance.
The RAA211450 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 and DEM 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 RAA211450 provides useful functions such as internal or programmable soft-start and power good indicator. For safe operation, the RAA211450 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) | 42 - 42 |
| Output Voltage (Min) [Rail 1] (V) | 0.8 |
| Output Voltage (Max) [Rail 1] (V) | 36 |
| Output Current (Max) [Rail 1] (A) | 5 |
| Switching Frequency Range (Typical) (kHz) | 200 - 800 |
| Control Type | Peak Current Mode |
| Peak Efficiency (%) | 90 |
| 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
 | Dexterous Robotic Hand Modular, high‑precision motor control architecture for scalable dexterous robotic hands. |
Additional Applications
- Up to 42V distributed power supplies & general purposes POL
- Telecommunication base station power supplies
- Power tools
- Surveillance
- Portable mobility devices
- Industrial power systems
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