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RAA211803

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Product Longevity: 2033

3.3V, 300mA, Ultra-Low Quiescent Current DC/DC Step-Down Regulator

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Features

  • 7V to 80V input supply range
  • Up to 300mA output current
  • IQ = 5.5μA at 80V, at no load conditions, switching
  • IQ = 4.5μA at 80V at no load and no switching conditions
  • Fixed 3.3V VOUT
  • Minimum on-time of 75ns
  • Variable frequency operation, frequency programmed by external inductor (10μH to 33μH)
  • Pre-bias, monotonic, and smooth start-up
  • Protections
    • Overcurrent (OC) limit
    • Input undervoltage lockout (UVLO)
    • Over-temperature protection (OTP)
    • Output overvoltage protection (OVP)
  • Accurate EN threshold
  • Package: TSOT23-5 (2.9mm x 1.63mm)
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Description

The RAA211803 is a tiny, easy-to-use, ultra-low quiescent current (IQ) buck regulator with a wide input voltage range of 7V to 80V and up to 300mA of output current with a fixed 3.3V output.

Available in a TSOT23-5 package, the device offers comprehensive protections, including VIN undervoltage lockout (UVLO), VOUT overvoltage protection (OVP), overcurrent protection, and over-temperature protection.

Parameters

Attributes Value
Topology [Rail 1] Buck
Outputs (#) 1
Input Voltage (Min) [Rail 1] (V) 7
Input Voltage (Max) [Rail 1] (V) 80 - 80
Output Voltage (Min) [Rail 1] (V) 3.18
Output Voltage (Max) [Rail 1] (V) 3.42
Output Current (Max) [Rail 1] (A) 0.3
Switching Frequency Range (Typical) (kHz) 170 - 170
Control Type Peak Current Mode
Peak Efficiency (%) 72
IQ [Rail 1] (µA) 5
SYNCH Capability No
Qualification Level Standard
Temp. Range (°C) -40 to +125°C
Simulation Model Available iSim

Package Options

Pkg. Type Pkg. Dimensions (mm) Lead Count (#) Pitch (mm)
TSOT 2.9 x 1.6 x 0.85 5 1

Application Block Diagrams

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Additional Applications

  • General-purpose or LDO replacement
  • Industrial power supplies
  • Embedded systems and I/O supplies
  • E-bikes
  • power tools
  • Home/Industrial automation

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The RAA21140x and RAA21180x families of bucks are simple to use and cost-effective while offering more than 15x less power loss of similar output rating LDOs (depending on operating conditions) with ultra-low 4uA Iq at zero loading conditions, making it ideal for powering always-on standby housekeeping MCUs or sensors. These bucks are ideal for general LDO replacement in applications such as industrial & home automation, eMobility solutions, energy storage, cordless power tools, and appliances.

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