ELM93xxxBCMOS High efficiency PFM step-up DC/DC converter
ELM93xxxB 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, ELM93 series is able to acquire constant output voltage higher than input voltage. The standard output voltages are 2.7V, 3.0V, and 3.3V; ELM93 series can also be designed as semi-custom IC within the range of 1.8V to 3.8V by 0.1V step.
| Output voltage range | 1.8V to 3.8V(by 0.1V) |
|---|---|
| Low voltage operation | Vin>=0.9V(RL=30kΩ) |
| Low power operation | Typ.24µW(ELM9330xB) |
| High efficiency | Typ.85% |
| High accuracy output voltage | ±2.5% |
| Output current(e.g.) | 40mA(Vin=1.5V, Vout=3.0V) |
| Package | SOT-89 SOT-23 |
| Datasheet | ELM93series |
- Application
- Constant voltage source for battery-operated devices
- Constant voltage source for cameras
- Portable communications equipments
- Local regulator
Absolute Maximum Ratings
| Parameter | Symbol | Limit | Unit |
|---|---|---|---|
| Apply voltage to LX pin | Vlx | 5 | V |
| Apply voltage to VOUT pin | Vout | 4 | V |
| Output current of LX pin | Ilx | 200 | mA |
| Power dissipation | Pd | 500(SOT-89), 250(SOT-23) | mW |
| Operating temperature | Top | -40 to +85 | °C |
| Storage temperature | Tstg | -55 to +125 | °C |
Block diagram
