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MCP1256 Datasheet(PDF) 1 Page - Microchip Technology |
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MCP1256 Datasheet(HTML) 1 Page - Microchip Technology |
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1 / 24 page  © 2006 Microchip Technology Inc. DS21989A-page 1 MCP1256/7/8/9 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 mV PP 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 •PICmicro® MCU Bias Typical Application 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 consumed by the MCP1258 or MPC1259. In normal operation, the output voltage ripple is below 20 mV PP at load currents up to 100 mA. Normal opera- tion occurs at a fixed switching frequency of 650 kHz, avoiding interference with sensitive IF bands. The MCP1256 and MCP1258 feature a power-good output that can be used to detect out-of-regulation conditions. The MCP1257 and MCP1259 feature a low- battery indication that issues a warning if the input voltage drops below a preset voltage threshold. Extremely low supply current and few external parts (4 capacitors) make these devices ideal for small, battery- powered applications. A Shutdown mode is also provided for further power reduction. The devices incorporate thermal and short-circuit pro- tection. Two package offerings are provided: 10-pin MSOP and 10-lead 3 mm x 3 mm DFN. The devices are completely characterized over the junction temper- ature range of -40°C to +125°C. PGOOD GND SHDN 1 2 3 4 MCP1256 VOUT 5 6 7 8 9 10 VIN SLEEP CIN 10 μF COUT 10 μF C1- C1+ C1 1 μF C2- C2+ C2 1 μF R1 INPUT 1.8V to 3.6V OUTPUT 3.3V Power-Good Indication ON / OFF Typical Application with Power-Good Indication Regulated 3.3V, Low-Ripple Charge Pump with Low- Operating Current SLEEP Mode or BYPASS Mode |
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