ELM94xxBPFM step-up DC/DC converter
ELM94xxB is CMOS step-up DC/DC converter which consists of reference voltage source, error amplifier, oscillation circuit, start-up circuit, PFM control circuit, switching transistor and output voltage setting resistor.
For external parts, coil, diode and capacitor are possible choices; with external parts, ELM94 series is able to acquire constant output voltage higher than input voltage.
The standard output voltages are 2.7V, 3.0V, 3.3V, and 5.0V; ELM94 series can also be designed as semi-custom IC within the range of 2.5V to 5.5V by 0.1V step.
| Output voltage range | 2.5V to 5.5V(by 0.1V) |
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| Low voltage operation | Vin>=0.98V(RL=30kΩ) |
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| Low power operation | Typ.12µW(ELM9430B) |
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| High efficiency | Typ.80% |
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| High accuracy output voltage | ±2.5% |
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| Output current(e.g.) | 20mA(Vin=1.5V, Vout=3.0V) |
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| Package | SOT-89 |
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| Datasheet | ELM94series |
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- Application
- Constant voltage source for battery-operated devices
- Constant voltage source for cameras
- Portable communication equipments
- Local regulator
