Microchip Technology MCP1640 Synchronous Boost Regulator

Microchip Technology MCP1640 Synchronous Boost Regulator is a compact, high-efficiency, fixed frequency, synchronous step-up DC-DC converter. It provides an easy-to-use power supply solution for applications powered by either single-cell, two-cell, or three-cell alkaline, NiCd, NiMH, and single-cell Li-Ion or Li-Polymer batteries.

Low-voltage technology allows the MCP1640 Synchronous Boost Regulator to start-up without high inrush current or output voltage overshoot from a low 0.65V input. High efficiency is accomplished by integrating the low resistance N-Channel Boost switch and synchronous P-Channel switch. All compensation and protection circuitry is integrated to minimize the number of external components. For standby applications, the MCP1640 consumes only 19µA while operating at no load, and provides a true disconnect from input to output while in Shutdown (EN = GND). Additional device options are available by operating in PWM-Only mode and connecting input to output while the device is in Shutdown.

The "true" load disconnect mode provides input-to-output isolation while the MCP1640 is disabled by removing the normal boost regulator diode path from input-to-output. The input-to-output bypass mode option connects the input to the output using the integrated low resistance P-Channel MOSFET, which provides a low bias voltage for circuits operating in Deep Sleep mode. Both options consume less than 1µA of input current. Output voltage is set by a small external resistor divider.

The Microchip Technology MCP1640 Synchronous Boost Regulator is available in 6-Lead SOT-23 and 8-Lead DFN packages.

Features

Up to 96% Typical Efficiency
800mA Typical Peak Input Current Limit:
- I_OUT > 100mA @ 1.2V V_IN, 3.3V V_OUT
- I_OUT > 350mA @ 2.4V V_IN, 3.3V V_OUT
- I_OUT > 350mA @ 3.3V V_IN, 5.0V V_OUT
Low Start-Up Voltage: 65V, typical 3.3V V_OUT@ 1mA
Low Operating Input Voltage: 35V, typical 3.3V_OUT @ 1mA
Adjustable Output Voltage Range: 2.0V to 5V
Maximum Input Voltage ≤ V_OUT < 5V
Automatic PFM/PWM Operation (MCP1640/C):
- PFM Operation Disabled (MCP1640B/D)
- PWM Operation: 500kHz

Low Device Quiescent Current: 19µA, typical PFM Mode (not switching)
Internal Synchronous Rectifier
Internal Compensation
Inrush Current Limiting and Internal Soft Start
Selectable, Logic Controlled Shutdown States:
- True Load Disconnect Option (MCP1640/B)
- Input to Output Bypass Option (MCP1640C/D)
Shutdown Current (All States): < 1µA
Low Noise, Anti-Ringing Control
Overtemperature Protection
Package Options:
- 6-Lead SOT-23
- 8-Lead DFN