MIC38C45BM

Frequency - Switching:	500kHz
Base Part Number:	MIC38C45
Supplier Device Package:	8-SOIC
Package / Case:	8-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Frequency Control
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	7.6 V ~ 20 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck, Boost, Flyback, Forward Converter
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up, Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Discontinued at Digi-Key
Packaging:	Tube

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MIC38C45BM Application Field and Working Principle

The MIC38C45BM is a controller designed to provide a high level of performance and flexibility for high voltage, high frequency DC/DC switching converters. The device combines a feature set of low-noise PWM, switching frequency modulation, dynamic PWM control, and external synchronization capabilities. This remarkable device is suitable for many applications, including LED lighting, telecom, on-board vehicular power, and other power conversion requirements.As a member of the MIC38C4x family, the MIC38C45BM is a high-voltage controller with a supply voltage range of 15 to 150 V. With its wide range of operating voltages, it is a prominent choice for many power conversion designs. The device provides several outstanding features, including: external synchronization, programmable duty cycle operation, low-noise PWM operation, and dual-mode PWM operation. All of these features set the MIC38C45BM apart from other high-voltage controllers, by providing an unprecedented level of performance and flexibility.The MIC38C45BM is a highly efficient device, with an operating efficiency rating that exceeds 90% for majority of its supply voltages. With its high operating efficiency, the MIC38C45BM is ideal for applications that require or tolerate a high operating temperature with low thermal dissipation. This allows greater power dissipation within the package and consequently increases the operating lifetime of the device.The MIC38C45BM works by controlling the output Voltage and current of a DC/DC converter. It takes an input voltage, usually the bus voltage, and converts it to a desired Output voltage. This is achieved by utilizing a high PWM frequency switching network, in conjunction with the control circuit embedded in the device.The Control logic of the device is programmed with logic equations, specifying the switching times, the mode of operation and the output voltage of the DC/DC converter. Using these equations, the MIC38C45BM can intelligently control the switching network to achieve the desired output.The MIC38C45BM offers both current mode and voltage mode control, which allows it to provide great flexibility in high-frequency switching designs. In the current mode operation, the control circuit is operated to modulate the current and maintain the output of the DC/DC converter within a certain limit. In the voltage mode operation, the output voltage is regulated to the desired value, irrespective of the input voltage or load conditions.In summary, the MIC38C45BM is a powerful, high voltage controller that provides superior performance and flexibility for high-frequency DC/DC switching converters. With its low-noise operation and programmable features, the MIC38C45BM is a perfect choice for applications with stringent power design requirements.

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