description
The LTC4412 controls an external P-channel MOSFET to create a near-ideal diode function for power switching or load sharing. This enables efficient "or" operation of multiple power supplies designed to extend battery life and reduce self-heating. When turned on, the voltage drop across the MOSFET is typically 20mV. For applications that use a wall adapter or other auxiliary power source, the load will automatically disconnect from the battery when the auxiliary power source is connected.
The LTC4412's wide power supply operating range supports the use of 1 to 6 series Li-Ion batteries to provide operating power. Low quiescent current (typically 11μA) is independent of load current. The gate driver includes an internal voltage clamp for MOSFET protection.
When an auxiliary power supply is detected, the STAT pin can be used to enable an auxiliary P-channel MOSFET power switch. This pin can also be used to signal the microcontroller when an auxiliary power supply is connected. The control (CTL) input allows the user to forcibly turn off the main MOSFET and place the STAT pin low.
The LTC4412 is available in a low profile (1mm height) ThinSOT package.
Characteristics
Very low loss alternative to power "or" diodes with very few external components
Automatic switching between DC power supplies simplifies the sharing of low quiescent current with multiple batteries: 11μA
3V to 28V AC/DC Adapter Voltage Range
2.5V to 28V battery voltage range Battery reverse protection drives virtually any size MOSFET to meet wide current range requirements
MOSFET Gate Protection Clamp Manual Control Input Flat (1mm Height) ThinSOTTM Package
application
Cellular phone laptop and handheld digital camera
USB Powered Peripheral Uninterruptible Power Supply Logic Control Type Power Switch
Ltc4412 application circuit
A DC motor is any of a class of rotary electrical machines that converts direct current electrical energy into mechanical energy. The most common types rely on the forces produced by magnetic fields. Nearly all types of DC motors have some internal mechanism, either electromechanical or electronic, to periodically change the direction of current flow in part of the motor.
DC motors were the first form of motor widely used, as they could be powered from existing direct-current lighting power distribution systems. A DC motor's speed can be controlled over a wide range, using either a variable supply voltage or by changing the strength of current in its field windings. Small DC motors are used in tools, toys, and appliances. The universal motor can operate on direct current but is a lightweight brushed motor used for portable power tools and appliances. Larger DC motors are currently used in propulsion of electric vehicles, elevator and hoists, and in drives for steel rolling mills. The advent of power electronics has made replacement of DC motors with AC motors possible in many applications.
DC Gear Motor,DC Shunt Motor,Shunt Motor,Small DC Motor
Shenzhen Maintex Intelligent Control Co., Ltd. , https://www.maintexmotor.com