Microchip MCP16251

Description

The MCP16251/2 is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. This family of devices provides an easy-to-use power supply solution for applications powered by either one-cell, two-cell or three-cell alkaline, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.

A low-voltage technology allows the regulator to start up without high inrush current or output voltage overshoot from a low voltage input. High efficiency is accomplished by integrating the low-resistance N-Channel boost switch and synchronous P-Channel switch. All compensation and protection circuitry are integrated to minimize external components. MCP16251/2 operates and consumes less than 14 μA from battery, while operating at no load (VOUT = 3.3V, VIN = 1.5V). The devices provide a true disconnect from input to output (MCP16251) or an input-to-output bypass (MCP16252), while in shutdown (EN = GND). Both options consume less than 0.6 μA from battery.

Output voltage is set by a small external resistor divider. Two package options, SOT-23-6 and 2 x 3 TDFN-8, are available

Features

• Up to 96% Typical Efficiency
• 650mA Typical Peak Input Current Limit:
• IOUT > 100 mA @ 3.3V VOUT, 1.2V VIN
• IOUT > 250 mA @ 3.3V VOUT, 2.4V VIN
• IOUT > 225 mA @ 5.0V VOUT, 3.3V VIN
• Low Device Quiescent Current:
• Output Quiescent Current: < 4 μA typical,device is not switching (VOUT > VIN, excluding feedback divider current)
• Input Sleep Current: 1 μA
• No Load Input Current: 14 μA typical
• Shutdown Current: 0.6 μA typical
• Low Start-up Voltage: 0.82V, 1 mA load
• Low Operating Input Voltage: down to 0.35V
• Adjustable Output Voltage Range: 1.8V to 5.5V
• Maximum Input Voltage  VOUT < 5.5V
• Automatic PFM/PWM Operation:
• PWM Operation: 500 kHz
• PFM Output Ripple: 150 mV typical
• Feedback voltage: 1.23V
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start (1.5 ms typical)
• Selectable, Logic Controlled, Shutdown States:
• True Load Disconnect Option (MCP16251)
• Input to Output Bypass Option (MCP16252)
• Anti-Ringing Control
• Overtemperature Protection
• Available Packages:
• SOT-23-6
• 2x 3 8-Lead TDFN

Typical applications

• Smartphones, MP3 Players, Digital Cameras
• Bias for Status LEDs
• •+3.3V to +5.0V Distributed Power Supply
• Remote controllers, Portable Instruments
• One, Two and Three Cell Alkaline and NiMH/NiCd Portable Products
• Solar Cell Applications
• Personal Care and Medical Products
• Wireless Sensors
• Bluetooth Headsets

More information

• Datasheet
• IC product information