Voltage Regulator MCP1642B SMD SMT


1.8 V, 175 mA, MSOP-8

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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
Internal Compensation
Inrush Current Limiting and Internal Soft-Start
Selectable, Logic-Controlled Shutdown States: 
- True Load Disconnect Option 
Shutdown Current (All States): 1 μA
Overtemperature Protection
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
Wireless Sensors
Hand-Held Instruments
GPS Receivers
+3.3 V to +5.0 V Distributed Power Supply


Kaal 0.1 g
Mõõtmed 1 × 1 × 0.5 cm


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