RAA211651

特長

4.5V to 60V input supply range
0.8V reference voltage with 1% accuracy
Adjustable output voltage (0.8V to Dmax*V_IN)
Modulator: Constant On-Time (COT)
Low quiescent current
Excellent line and load regulation
Selectable internal or external control loop compensation
Variable load dependent switching frequency
Output Power-Good (PG) indicator
Programmable and optional fixed 2ms soft-start and soft-stop feature
Programmable startup and shutdown delay
Integrated LDO with bypass capability allowing for high-efficiency operation
Full protection: High-Side Overcurrent (HSOC) and low-side current protections in both directions, output Overvoltage Protection (OVP) and Output Undervoltage Protection (OUVP), input Undervoltage Lockout (UVLO), and Over-Temperature Protection (OTP)
Optional 3.3V default V_OUT using internal feedback
28 Ld 4mmx5mm QFN package

説明

The RAA211651 is an integrated 60V, 5A synchronous buck regulator with the Constant On-Time (COT) control scheme. It supports a wide range of input voltage from 4.5V to 60V and adjustable output voltage (0.8V to maximum duty cycle * V_IN). It also features a very low quiescent current, typically 10μA at 24V input. The modulation scheme used allows for high efficiency at all output load levels, especially at light-load conditions.

The RAA211651 is based on the COT modulator, where the on-time is determined by the input voltage level and the resistor connected to the SET pin. The switching frequency varies with the load. At light load, switching frequency drops reducing the switching losses. Also, with internal compensation, the regulator works in Diode Emulation mode reducing the losses at light-load conditions.

To limit inrush current during startup the RAA211651 has 2ms fixed internal soft-start time. It can also be programmed by an external capacitor. The RAA211651 also provides programmable startup delay time for sequencing purposes.

The RAA211651 provides comprehensive protections including undervoltage lockout, overcurrent (positive and negative), overvoltage, and over-temperature protections.

パラメータ

属性	値
Topology [Rail 1]	Buck
Outputs (#)	1
Input Voltage (Min) [Rail 1] (V)	4.5
Input Voltage (Max) [Rail 1]	60
Output Voltage (Min) [Rail 1] (V)	0.8
Output Voltage (Max) [Rail 1] (V)	55
Output Current (Max) [Rail 1] (A)	5
Switching Frequency Range (Typical) (kHz)	200 - 2500
Control Type	COT
Peak Efficiency (%)	90
IQ [Rail 1] (µA)	10
SYNCH Capability	No
Qualification Level	Standard
Temp. Range (°C)	-40 to +125°C

パッケージオプション

Pkg. Type	Pkg. Dimensions (mm)	Lead Count (#)	Pitch (mm)
QFN	5.0 x 4.0 x 0.90	28	0.5

アプリケーション・ブロック図

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