company blog about Mingjiada Supply ADI LT3973 Adjustable Frequency Monolithic Step-Down Regulator

Mingjiada Supply ADI LT3973 Adjustable Frequency Monolithic Step-Down Regulator

In industrial control, automotive electronics, telecommunications equipment and high-voltage input systems, power converters must balance a wide input voltage range, stable output and flexible frequency design options. Mingjiada Electronics has long supplied the ADI (Analog Devices) LT3973 series of adjustable-frequency, monolithic 42V, 750mA step-down regulators, providing highly integrated and reliable power solutions for high-voltage input and small-to-medium power step-down applications.

[ADI] LT3973 – 42V, 750mA step-down regulator with 2.5μA quiescent current and integrated diodes
The LT3973 is a variable-frequency, monolithic step-down switching regulator that accepts a wide input voltage range of up to 42V whilst consuming only 2.5μA of quiescent current. A high-efficiency switch, along with a clamping diode, a boost diode and the necessary oscillator, control and logic circuits, are integrated onto the chip. Low-ripple burst-mode operation maintains high efficiency under low output current conditions and suppresses output ripple to less than 10 mV in typical applications. When the input voltage drops below the programmed output voltage (for example, during cold start-up of a vehicle), a minimum dropout voltage of 530 mV is maintained.

LT3973 Key Features:
Ultra-low quiescent current: 2.5 μA IQ (at 12 VIN to 3.3 VOUT)
Low-ripple Burst Mode® operation: Output ripple < 10 mV p-p
Wide input voltage range: 4.2 V to 42 V during operation
Adjustable switching frequency: 200 kHz to 2.2 MHz
Integrated boost and clamping diodes
750 mA output current
Excellent start-up and dropout performance
Fixed output voltages: 3.3 V, 5 V
IQ of 1.9 μA at 12 VIN
Accurate, programmable under-voltage lockout
Low quiescent current: IQ = 0.75 μA
Internal clamping diode current limit
Power-good flag
Thermal shutdown
Compact, thermally enhanced 10-pin MSOP and (3 mm × 3 mm) DFN packages

Availability Information
Shenzhen Mingjiada Electronics Co., Ltd. — a long-standing distributor of the ADI product range — maintains a stock of LT3973 series adjustable-frequency step-down regulators, including but not limited to the following:
LT3973EDD
LT3973EDD-3.3
LT3973EDD-5
LT3973EMSE
LT3973EMSE-3.3
LT3973EMSE-5
LT3973HDD
LT3973HDD-3.3
LT3973HDD-5
LT3973HMSE
LT3973HMSE-3.3
LT3973HMSE-5
LT3973IDD
LT3973IDD-3.3
LT3973IDD-5
LT3973IMSE

Typical Applications
The LT3973 series is suitable for a wide range of high-voltage input, low-to-medium power step-down applications, including but not limited to:
Industrial automation: PLC modules, industrial sensors, field instruments, 24V industrial bus power supply
Automotive Electronics: Auxiliary power supplies for in-vehicle infotainment systems, body control modules, and in-vehicle sensor power supplies
Telecommunications Equipment: Auxiliary power supplies for base stations, power supplies for optical modules, and power rails for routers and switches
Test and Measurement: Power supplies for portable instruments and precision measurement equipment
Battery Power Systems: Step-down conversion for multi-cell battery packs and backup power modules
General-Purpose Step-Down Power Supplies: Embedded systems requiring 42V withstand voltage and adjustable frequency

Mingjiada Electronics supports sample orders, small-batch procurement and supply by the reel. To confirm specific part numbers, stock levels and real-time prices, please visit the Mingjiada Electronics website (https://www.integrated-ic.com/) for further supply details.