MCP1256-EMF Microchip

MCP1256/7/8/9 Regulated 3.3V, Low-Ripple Charge Pump with Low- Operating Current SLEEP Mode or BYPASS Mode Features Description The MCP1256, MCP1257, MCP1258 and MCP1259 Inductorless 1.5x, 2x Boost DC/DC Converter are inductorless, positive regulated charge pump Output Voltage: 3.3V DC/DC converters. The devices generate a regulated High Output Voltage Accuracy: 3.3V output voltage from a 1.8V to 3.6V input. The - 3.0% (V Fixed) OUT devices are specifically designed for applications Output Current Up To 100 mA operating from 2-cell alkaline, Ni-Cd, or Ni-MH batteries or by one primary lithium MnO2 (or similar) 20mV Output Voltage Ripple PP coin cell battery. Thermal Shutdown and Short Circuit Protection The MCP1256, MCP1257, MCP1258 and MCP1259 Uses Small Ceramic Capacitors provide high efficiency by automatically switching Switching Frequency: 650 kHz between 1.5x and 2x boost operation. In addition, at Low-Power SLEEP Mode: MCP1256/7 light output loads, the MCP1256 and MCP1257 can be BYPASS Mode: MCP1258/9 placed in a SLEEP mode, lowering the quiescent Low-Power Shutdown Mode: 0.1 A (Typical) current while maintaining the regulated output voltage. Shutdown Input Compatible with 1.8V Logic Alternatively, the MCP1258 and MCP1259 provide a BYPASS feature connecting the input voltage to the V Range: 1.8V to 3.6V IN output. This allows for real-time clocks, Soft-Start Circuitry to Minimize Inrush Current microcontrollers or other system devices to remain Temperature Range: -40C to +125C biased with virtually no current being consumed by the Packaging: MCP1258 or MPC1259. - 10-Pin, 3 mm x 3 mm DFN In normal operation, the output voltage ripple is below -10-Pin, MSOP at load currents up to 100 mA. Normal opera- 20 mV PP tion occurs at a fixed switching frequency of 650 kHz, Applications avoiding interference with sensitive IF bands. The MCP1256 and MCP1258 feature a power-good Pagers output that can be used to detect out-of-regulation Portable Measurement Instruments conditions. The MCP1257 and MCP1259 feature a low- Home Automation Products battery indication that issues a warning if the input PIC MCU Bias voltage drops below a preset voltage threshold. Extremely low supply current and few external parts (4 Typical Application capacitors) make these devices ideal for small, battery- powered applications. A Shutdown mode is also MCP1256 OUTPUT INPUT provided for further power reduction. 1.8V to 3.6V 3.3V 7 5 V V IN OUT C C The devices incorporate thermal and short-circuit pro- IN OUT R 10 1 10 F 10 F SHDN tection. Two package offerings are provided: 10-pin 1 PGOOD Power-Good MSOP and 10-lead 3 mm x 3 mm DFN. The devices Indication 4 6 C + C + 1 2 C C 1 2 are completely characterized over the junction temper- 8 3 1F C - 1F C - 1 2 ature range of -40C to +125C. 2 SLEEP GND ON / OFF 9 Typical Application with Power-Good Indication 2006-2013 Microchip Technology Inc. DS21989B-page 1MCP1256/7/8/9 Package Pinouts MCP1256 MCP1257 PGOOD 1 10 SHDN LBO 1 10 SHDN SLEEP 2 9 GND SLEEP 2 9 GND C - 3 8 C - C - 3 8 C - 2 1 2 1 C + 4 7 V C + 4 7 V 1 IN 1 IN V 5 6 C + V56 C + OUT 2 OUT 2 MCP1258 MCP1259 PGOOD 1 10 SHDN LBO 1 10 SHDN BYPASS 2 9 GND BYPASS 2 9 GND C - 3 8 C - C - 3 8 C - 2 1 2 1 C + 4 7 V C + 4 7 V 1 IN 1 IN V 56 C + V56 C + OUT 2 OUT 2 Functional Block Diagram C-C+C-C + 2 2 1 1 V IN 1.5x, 2x Mode 840 k Gate Drives Comparator S1 S5 S6 + S5,S7 D Q - S6 S4 S1,S3,CE 650 kHz Osc. S4 V OUT 840 k CE S2 S3 S7 Bandgap + Ref. - Feedback 480 k 720k Amplifier GND V OUT TABLE 1: SWITCH LOGIC Mode Phase Oscillator Q S1 S2(CE) S3 S4 S5 S6 S7 1.5x Charging H L H H H L H L H 1.5x Transfer L L L L L H L H L 2x Charging H H H H H L L H L 2x Transfer L H L L L H L H L BYPASS H L H H H L L Legend: L is Logic Low, H is Logic High DS21989B-page 2 2006-2013 Microchip Technology Inc.