Description
The MCP1641X Step-up DC-DC Converters family
provides an automatic input-to-output voltage bypass
operation, which helps optimize battery utilization and
achieve high efficiency, while the nominal voltage of
fresh batteries remains in the same range with the converter’s
output value. The MCP1641X can be powered
by either single-cell, two-cell alkaline/NiMH batteries or
single-cell Li-Ion/Li-Polymer batteries.
A low-voltage designed architecture allows the
regulator to start up without high inrush current or
output voltage overshoot from a low input voltage. The
start-up voltage is easily programmed by a resistive
divider connected to the UVLO pin. If the resistive
divider is not used, the default start-up voltage is 0.85V.
The 0.8V built-in UVLOSTOP helps prevent deep discharge
of the alkaline battery, which can cause battery
leakage. An open-drain Low Battery Output (LBO) pin
warns the user to replace the battery if the input voltage
ramps down to the programmed UVLOSTART value.
The MCP1641X family introduces an additional safety
feature to a low-voltage boost converter: Overtemperature
Output. Devices, such as personal care
products, Bluetooth headsets or toys, will benefit from
the combined Power Good and Die Overtemperature
(PGT) output, which flags a warning signal when the output
voltage level drops within 10% or the die temperature
exceeds the +75°C (typical).(1) Both functions are
implemented in the MCP16411/2/3/4 devices (on the
same pin, PGT), while the MCP16415/6/7/8 devices
have only the Power Good option.

Features
• Input Voltage Range: 0.8V (after Start-up) 
to 5.25V
• Low Device Quiescent Current: 5 μA (typical),
PFM Mode (not switching)
• Up to 96% Efficiency
• 1A Typical Inductor Peak Current Limit:
- IOUT > 170 mA at 2V VOUT, 1.2V VIN
- IOUT > 200 mA at 3.3V VOUT, 1.5V VIN
- IOUT > 600 mA at 5.0V VOUT, 3.6V VIN
• Adjustable Output Voltage Range
• Automatic Input-to-Output Bypass Operation
• Selectable Switching Mode:
- PWM operation: 500 kHz (MCP16412/4/6/8)
- Automatic PFM/PWM operation
(MCP16411/3/5/7)
• Programmable Undervoltage Lockout (UVLO)
• Programmable Low Battery Output (LBO)
• Selectable Status Indicator:
- Power Good and Die Overtemperature 
output (MCP16411/2/3/4)
- Power Good output (MCP16415/6/7/8)
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting and Internal Soft Start
• Low Noise, Anti-Ringing Control
• Thermal Shutdown
• Selectable Shutdown States:
- Output discharge option (MCP16411/2/5/6)
- Input-to-output bypass option
(MCP16413/4/7/8)
• Shutdown Current: 2.3 μA (typical)
• Available Packages:
- 10-Lead MSOP
- 10-Lead 3 mm x 3 mm TDFN

Applications
• Personal and Health Care Products
• Single-Cell or Two-Cell Powered IoT Devices
• Bluetooth® Headsets
• Remote Controllers, Portable Instruments
• Wireless Sensors, Data Loggers