The MCP1642B/D devices are compact, high-efficiency, fixed-frequency, synchronous step-up DC-DC converters. 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, Ultimate Lithium, NiCd, NiMH, one-cell Li-Ion or Li-Polymer batteries.
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 the number of external components. An open-drain Power Good output is provided to indicate when the output voltage is within 10% of regulation and facilitates the interface with an MCU. For standby applications, MCP1642B provides a “true output disconnect” from input to output while in shutdown (EN = GND). An additional device option (MCP1642D) is available and connects “input to output bypass” while in shutdown. Both options consume less than 1 μA of input current.
For the adjustable (ADJ) device options, the output voltage is set by a small external resistor divider. Fixed VOUT device options do not require external divider resistors. Two package options, 8-lead MSOP and 8- lead 2×3 DFN, are available.
Up to 96% Typical Efficiency
1.8 A Typical Peak Input Current Limit:
– Iout > 175 mA @ 1.2 V Vin, 3.3 V Vout
– Iout > 600 mA @ 2.4 V Vin, 3.3 V Vout
– I >800 mA@3.3 V Vin ,5.0 V Vout
– Iout > 1A @ VIN > 3.6 V, 5.0 V Vout
Low Start-Up Voltage: 0.65 V, typical 3.3 V VOUT @1 mA
Low Operating Input Voltage: 0.35 V, typical 3.3 V VOUT @ 1 mA
Output Voltage Range:
– Reference Voltage, VFB = 1.21 V
– 1.8 V to 5.5V for the adjustable device option
– 1.8 V, 3.0 V, 3.3 V and 5.0 V for fixed VOUT options
Maximum Input Voltage <= VOUT < 5.5V
PWM Operation: 1MHz: - Low Noise, Anti-Ringing Control
Power Good Open-Drain Output
Internal Synchronous Rectifier
Inrush Current Limiting and Internal Soft-Start
Selectable, Logic-Controlled Shutdown States: - True Load Disconnect Option Shutdown Current (All States): 1 μA
Available Packages: - 8-Lead MSOP - 8-Lead 2×3 DFN
One,Two and Three-Cell Alkaline, Lithium Ultimate and NiMH/NiCd Portable Products
Single-Cell Li-Ion to 5 V Converters
PIC® MCU Power
USB Emergency Backup Chargerfrom Batteries
Personal Medical Products
+3.3 V to +5.0 V Distributed Power Supply
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