Features
- Wide VIN buck regulator
- Input voltage: 3V to 40V with 1.1A output current
- Internal fixed frequency (500kHz) or adjustable switching frequencies (300kHz to 2MHz)
- Selectable PFM or PWM mode at light loads
- Internal or external soft-start
- Low VIN buck regulator
- Input voltage: 2.7V to 5.5V, with 1.5A output current
- VOUT range: 0.6V to VIN
- Fixed 1MHz switching frequency
- Synchronous operation for high efficiency
- Integrated high-side and low-side MOS devices
- Internal or external compensation option
- Power-good and enable functions
- Thermal shutdown
Description
The RAA212422 is a dual output regulator combining a 1.1A synchronous buck regulator with an input range of 3V to 40V with a 1.5A synchronous buck regulator with an input voltage range of 2.7V to 5.5V. Because both high-side and low-side MOSFETs are integrated for both regulators, the RAA212422 provides an easy-to-use, high-efficiency, and low BOM-count solution for a variety of applications. Both regulators feature internal and external compensation, thermal shutdown, and power-good functions. The wide VIN buck regulator features a PFM mode for improved efficiency at light load. This feature can be disabled if forced PWM mode is desired. It switches at a default frequency of 500kHz; however, it can also be programmed using an external resistor from 300kHz to 2MHz. Other features include programmable soft-start and hiccup overcurrent protection. The low VIN buck regulator operates at 1MHz switching frequency, which provides fast load transient response allowing the use of small inductors. Because the high-side MOSFET of the low VIN buck regulator is a PMOS, a boot capacitor is not needed, reducing the external component count. They operate at 100% duty cycle and in PWM mode only, reducing noise susceptibility and RF interference. The RAA212422 is available in a small RoHS compliant 3mmx6mm TDFN plastic package with a full-range industrial temperature of -40°C to +125°C.
Parameters
| Attributes | Value |
|---|---|
| Topology [Rail 1] | Buck |
| Outputs (#) | 2 |
| Input Voltage (Min) [Rail 1] (V) | 3 |
| Input Voltage (Max) [Rail 1] (V) | 40 - 40 |
| Output Voltage (Min) [Rail 1] (V) | 0.6 |
| Output Voltage (Max) [Rail 1] (V) | 1.1 |
| Output Current (Max) [Rail 1] (A) | 1.5 |
| Switching Frequency Range (Typical) (kHz) | 300 - 2000 |
| Control Type | Current Mode |
| Peak Efficiency (%) | 94 |
| SYNCH Capability | Yes |
| Qualification Level | Standard |
| Temp. Range (°C) | -40 to +125°C |
Package Options
| Pkg. Type | Pkg. Dimensions (mm) | Lead Count (#) | Pitch (mm) |
|---|---|---|---|
| TDFN | 6.0 x 3.0 x 0.75 | 22 | 0.5 |
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