Description
The MCP1252/3 are inductorless, positive-regulated charge pump DC/DC converters. The devices generate a regulated fixed (3.3V or 5.0V) or adjustable output voltage. They are specifically designed for applications requiring low noise and high efficiency and are able to deliver up to 120 mA output current. The devices allow the input voltage to be lower or higher than the output voltage, by automatically switching between buck/ boost operation. The MCP1252 has a switching frequency of 650 kHz, avoiding interference with sensitive IF bands. The MCP1253-ADJI/MS has a switching frequency of 1 MHz and allows the use of smaller capacitors than the MCP1252, thus saving board space and cost. Both devices feature a power-good output that can be used to detect out-of-regulation conditions. Extremely low supply current and low external parts count (three capacitors) make these devices ideal for small, batterypowered applications. A shutdown mode is also provided for further power reduction. The MCP1252 and MCP1253-ADJI/MS feature thermal and short-circuit protection and are offered in space-saving, 8-lead, MSOP packages.
Features
• Inductorless, Buck/Boost, DC/DC Converter
• Low Power: 80 µA (Typical)
• High Output Voltage Accuracy: - ±2.5% (VOUT Fixed)
• 120 mA Output Current
• Wide Operating Temperature Range: - -40°C to +85°C
• Thermal Shutdown and Short-Circuit Protection
• Uses Small Ceramic Capacitors
• Switching Frequency: - MCP1252: 650 kHz - MCP1253: 1 MHz
• Low Power Shutdown Mode: 0.1 µA (Typical)
• Shutdown Input Compatible with 1.8V Logic
• VIN Range: 2.0V to 5.5V
• Selectable Output Voltage (3.3V or 5.0V) or Adjustable Output Voltage
• Space-saving, 8-Lead MSOP
• Soft-Start Circuitry to Minimize In-Rush Current
Feature
- Wide 2.1 to 5.0V input range
- Fixed, regulated 3.3 V, 5.0 V, or adjustable (1.5 to 5.5 V) outputs
- Supplies regulated output voltages for up to 120 mA loads
- Low 60 µA supply current in no load conditions
- High 2.5% voltage accuracy (on fixed voltage outputs)
- High 1 MHz operation to avoid interference with IF bands and allows for small capacitor use to save board space and cost
- Logic level shutdown control reduces current consumption to 0.1 µA during standby operation
- Power-good output indicator with hysteresis
- Thermal shutdown protection with hysteresis
- Short circuit protection
- Soft-start circuitry to minimize inrush current
- -40 ºC to +85 ºC operation
(Picture:Pinout / Diagram)
