ELM624BA
0.9V boot high efficiency synchronous step-up converter
ELM624BA provides power-supply solutions for products powered by either one, two or three-cell Alkaline, NiMH, or one-cell Li-Ion or Li-polymer battery. Its available output current depends on the input-to-output voltage ratio. ELM624BA works based on current–mode pulse-width-modulation (PWM) control using synchronous rectification to obtain maximum efficiency with the minimum quiescent current. The output voltage is programmed using an external resistor divider. ELM624BA circuit is switched off to minimize battery consumption during the shutdown mode and connects the VIN pin to the VOUT pin allowing the input battery to be used for backup systems like a real-time clock supply and SRAM data hold when the converter is off. ELM624BA is offered in a small 6-pin SOT-26 package.
| VOUT pulled to VIN in shutdown mode | |
|---|---|
| Input under-voltage lockout | |
| Switching frequency | 800kHz (4.7µH) |
| Adjustable output voltage | 2.5V to 5.5V |
| High efficiency | 92% |
| Quiescent current | 12µA |
| Startup input voltage/load | 0.9V/10mA, 0.7V/1mA |
| Operating input voltage | 0.9V to 5V |
| Switch current | 450mA max. |
| Package | SOT-26 Show datasheet |
| Datasheet | ELM624BA |
- Application
- Battery powered applications :
- 1 to 3 Cell Alkaline, NiCd or NiMH
- 1 cell Li-lon - Solar or fuel cell powered applications
- Consumer and portable medical products
- Personal electronics goods
Absolute Maximum Ratings
| Parameter | Symbol | Limit | Unit |
|---|---|---|---|
| Supply voltage | Vin | -0.3 to +6.0 | V |
| Output voltage | Vout | -0.3 to +6.0 | V |
| The other pins | Vother | -0.3 to +6.0 | V |
| Dynamic Vsw in 10ns duration | Vsw | -2.0 to Vout+2.0 | V |
| Junction temperature | Tj | +150 | °C |
| Lead temperature(Soldering 10s) | 260 | °C | |
| Thermal resistance | θja | 125 | °C/W |
| Thermal resistance | θjc | 66 | °C/W |
| Power dissipation | Pd | 0.8 | W |
| Storage temperature range | Tstg | -55 to +150 | °C |
Block diagram
