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MCP1256

Microchip Technology
Part Number MCP1256
Manufacturer Microchip Technology
Description Low-Ripple Charge Pump
Published May 31, 2010
Detailed Description MCP1256/7/8/9 Regulated 3.3V, Low-Ripple Charge Pump with LowOperating Current SLEEP Mode or BYPASS Mode Features • In...
Datasheet PDF File MCP1256 PDF File

MCP1256
MCP1256

Overview
MCP1256/7/8/9 Regulated 3.
3V, Low-Ripple Charge Pump with LowOperating Current SLEEP Mode or BYPASS Mode Features • Inductorless 1.
5x, 2x Boost DC/DC Converter • Output Voltage: 3.
3V • High Output Voltage Accuracy: - ±3.
0% (VOUT Fixed) • Output Current Up To 100 mA • 20 mVPP Output Voltage Ripple • Thermal Shutdown and Short Circuit Protection • Uses Small Ceramic Capacitors • Switching Frequency: 650 kHz • Low-Power SLEEP Mode: MCP1256/7 • BYPASS Mode: MCP1258/9 • Low-Power Shutdown Mode: 0.
1 µA (Typical) • Shutdown Input Compatible with 1.
8V Logic • VIN Range: 1.
8V to 3.
6V • Soft-Start Circuitry to Minimize Inrush Current • Temperature Range: -40°C to +125°C • Packaging: - 10-Pin, 3 mm x 3 mm DFN - 10-Pin, MSOP Applications • Pagers • Portable Measurement Instruments • Home Automation Products • PIC® MCU Bias Typical Application INPUT 1.
8V to 3.
6V CIN 10 µF C1 1 µF ON / OFF MCP1256 7 VIN VOUT 5 10 SHDN PGOOD 1 4 C1+ 8 C1- C2+ 6 C2- 3 2 SLEEP GND 9 OUTPUT 3.
3V R1 COUT 10 µF C2 1 µF Power-Good Indication Typical Application with Power-Good Indication Description The MCP1256, MCP1257, MCP1258 and MCP1259 are inductorless, positive regulated charge pump DC/DC converters.
The devices generate a regulated 3.
3V output voltage from a 1.
8V to 3.
6V input.
The devices are specifically designed for applications operating from 2-cell alkaline, Ni-Cd, or Ni-MH batteries or by one primary lithium MnO2 (or similar) coin cell battery.
The MCP1256, MCP1257, MCP1258 and MCP1259 provide high efficiency by automatically switching between 1.
5x and 2x boost operation.
In addition, at light output loads, the MCP1256 and MCP1257 can be placed in a SLEEP mode, lowering the quiescent current while maintaining the regulated output voltage.
Alternatively, the MCP1258 and MCP1259 provide a BYPASS feature connecting the input voltage to the output.
This allows for real-time clocks, microcontrollers or other system devices to remain biased with virtually no current being consu...


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