MCP1253-ADJI/MS Microchip

MCP1252/3 Low-Noise, Positive-Regulated Charge Pump Features: Description: Inductorless, Buck/Boost, DC/DC Converter The MCP1252/3 are inductorless, positive-regulated charge pump DC/DC converters. The devices generate Low Power: 80 A (Typical) a regulated fixed (3.3V or 5.0V) or adjustable output High Output Voltage Accuracy: voltage. They are specifically designed for applications - 2.5% (V Fixed) OUT requiring low noise and high efficiency and are able to 120 mA Output Current deliver up to 120 mA output current. The devices allow Wide Operating Temperature Range: the input voltage to be lower or higher than the output - Industrial Temperature (I): -40C to +85C voltage, by automatically switching between buck/ boost operation. - Extended Temperature (E): -40C to +125C The MCP1252 has a switching frequency of 650 kHz, Thermal Shutdown and Short-Circuit Protection avoiding interference with sensitive IF bands. The Uses Small Ceramic Capacitors MCP1253 has a switching frequency of 1 MHz and Switching Frequency: allows the use of smaller capacitors than the - MCP1252: 650 kHz MCP1252, thus saving board space and cost. - MCP1253: 1 MHz Both devices feature a power-good output that can be Low-Power Shutdown Mode: 0.1 A (Typical) used to detect out-of-regulation conditions. Extremely Shutdown Input Compatible with 1.8V Logic low supply current and low external parts count (three V Range: 2.0V to 5.5V capacitors) make these devices ideal for small, battery- IN powered applications. A shutdown mode is also pro- Selectable Output Voltage (3.3V or 5.0V) or vided for further power reduction. The MCP1252 and Adjustable Output Voltage MCP1253 feature thermal and short-circuit protection Space-Saving, 8-Lead MSOP and are offered in space-saving, 8-lead, MSOP Soft-Start Circuitry to Minimize In-Rush Current packages. AEC-Q100 Qualified Package Types Applications: White LED Backlighting MSOP (Fixed) Color Display Bias PGOOD 1 8 SELECT Local 3V-to-5V Conversions Flash Memory Supply Voltage V 2 MCP1252 7 SHDN OUT SIM Interface Supply for GSM Phones MCP1253 V 3 6 C+ IN Smart Card Readers GND 4 5 C- PCMCIA Local 5V Supplies MSOP (Adjustable) PGOOD 1 8 FB V 2 7 SHDN OUT MCP1252 V 3 6 C+ IN MCP1253 GND 4 5 C- 2002-2014 Microchip Technology Inc. DS20001752C-page 1MCP1252/3 Functional Block Diagram MCP1252-33X50 MCP1253-33X50 PGOOD SELECT 140 k 173 k 84 mV + 100 k + 1.21V + 200 mV V SHDN OUT C+ Switch C- Control V IN GND MCP1252-ADJ MCP1253-ADJ PGOOD FB 84 mV + + 1.21V + 200 mV V SHDN OUT C+ Switch C- Control V IN GND DS20001752C-page 2 2002-2014 Microchip Technology Inc. - + - + + - - + - + + -