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- Manufacturer: Pololu
- Order number: EXP-R25-292
- Manufacturer part number: 2564
- Availability: 24
- country of origin: US
- HS code: 90328900
- Weight (kg): 0.001
This 5 V boost (step-up) voltage regulator generates higher output voltages from input voltages as low as 0.5 V, and it also automatically switches to a linear down-regulation mode when the input voltage exceeds the output. This makes it great for powering 5 V electronics projects from 1 to 3 NiMH, NiCd, or alkaline cells or from a single lithium-ion cell.
When boosting, this module acts as a switching regulator (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and has a typical efficiency between 70% to 90%. The available output current is a function of the input voltage, output voltage, and efficiency (see Typical Efficiency and Output Current section below), but the input current can typically be as high as 1.2 A. This regulator is also available with a fixed 3.3 V output, and very similar 3.3V, 5V, and adjustable-output versions are available with a true shutdown option that turns off power to the load.
The regulator’s thermal shutdown engages at around 140°C and helps prevent damage from overheating, but it does not have short-circuit or reverse-voltage protection.
- Input voltage: 0.5 V to 5.5 V
- Fixed 5 V output with 4% accuracy
- Automatic linear down-regulation when the input voltage is greater than the output voltage
- 1.2 A switch allows for input currents up to 1.2 A
- Good efficiency at light load: <1 mA typical no-load quiescent current, though it can exceed 1 mA for very low input voltages
- Integrated over-temperature shutoff
- Small size: 0.35″ × 0.45″; × 0.1″ (9 × 11.5 × 2.5 mm)
The input voltage, VIN, must be at least 0.5 V for the regulator to turn on. However, once the regulator is on, the input voltage can drop as low as 0.3 V and the 5 V output voltage will be maintained on VOUT. Unlike standard boost regulators, this regulator has an additional linear down-regulation mode that allows it to convert input voltages as high as 5.5 V down to 5 V for small to moderate sized loads. When the input voltage exceeds 5 V, the regulator automatically switches to this down-regulation mode. The input voltage should not exceed 5.5 V. Please be wary of destructive LC spikes that might cause the input voltage to surpass 5.5 V (see below for more information).
The three connections are labeled on the back side of the PCB, and they are arranged with a 0.1″ spacing along the edge of the board for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1″ grid. You can solder wires directly to the board or solder in either the 3×1 straight male header strip or the 3×1 right-angle male header strip that is included.
LC Voltage Spikes
More information about LC spikes can be found in our application note, Understanding Destructive LC Voltage Spikes.
- Size: 0.35″ × 0.45″ × 0.1″1
- Weight: 0.4 g1
- Minimum operating voltage: 0.5 V
- Maximum operating voltage: 5.5 V
- Maximum input current: 1.2 A2
- Output voltage: 5 V
- Reverse voltage protection?: N
- Maximum quiescent current: 1 mA3
- 1. Without included optional headers.
- 2. Regulator may overheat at lower input currents when VIN is much lower than VOUT. Available output current is a function of VIN, VOUT, and the regulator efficiency.
- 3. The highest quiescent currents occur at very low input voltages; for most of the input voltage range, the quiescent current is well below 1 mA.