LM2852XMXA-3.3

Voltage - Output (Min/Fixed):	3.3V
Base Part Number:	LM2852
Supplier Device Package:	14-HTSSOP
Package / Case:	14-TSSOP (0.173", 4.40mm Width) Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1.5MHz
Current - Output:	2A
Voltage - Output (Max):	--
Series:	SIMPLE SWITCHER®
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.85V
Number of Outputs:	1
Output Type:	Fixed
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tube

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LM2852XMXA-3.3 Application Field and Working Principle

Introduction

The LM2852XMXA-3.3 is a high-performance monolithic dc-to-dc converter with a stepped-current limit and a fixed 3.3V output voltage. It is an ideal device for supplying modern microprocessors, digital signal processors, ASICs, ASSPs, and system logic power supplies. The device includes an insulated gate bipolar transistor (IGBT) gate driver, an error amplifier, and a high current sense amplifier and offers an integrated single-ended forward converter topology with synchronous rectification. The device is fully protected from fault conditions due to its high-current limit, undervoltage lockout, and over temperature protection features.

Application Field

The LM2852XMXA-3.3 is designed for high current dc-to-dc conversion applications. It is suitable for powering various logic, microprocessor, and system logic power supplies such as those used in telecom and computer systems, instrumentation and medical applications.The LM2852XMXA-3.3 can also be used in LED driver applications where it provides efficient conversion of 24V or 48V to 3.3V with excellent load transient performance. The device also provides current limiting capabilities that protect LEDs from overcurrent and maximize LED lifetime.The device is also suitable for low-noise power systems where noise generated by the device is minimal due to the implementation of low-noise switching techniques, such as Burst Mode operation and frequency sync-to-clock.

Characteristics

The device features a wide input range (3.3-60V) with no external components required for operation. The device also features an adjustable switching frequency and a wide operating temperature range (-40°C to +100°C).The LM2852XMXA-3.3 also offers over current protection, adjustable current limit and over temperature shutdown. The device provides a maximum 3.3V voltage output at up to 40A with a maximum efficiency of 96%. The device also provides an enable/disable function and a power-good signal.

Working Principle

The LM2852XMXA-3.3 is a single-ended forward converter with synchronous rectification. The device includes an IGBT power switch and two drivers. The primary side of the device is a forward converter made up of an IGBT, a current sense circuit, a reference voltage and a pass element. The IGBT switch is driven with an external signal. The current sense circuit senses the current in the primary winding and adjusts the duty cycle value to meet a target output current.The output voltage is regulated by an error amplifier comparing the output voltage with an internal reference. The error amplifier also adjusts the duty cycle to meet the output voltage. When an over temperature condition is detected the device will automatically shut down.The secondary side of the device comprises a synchronous rectifier and an output filter. The synchronous rectifier is made up of two FETs and reduces the voltage drop on the output side. The output filter further reduces the output ripple and provides a stable output voltage. The output filter is made up of an inductor, a capacitor, and a diode.

Conclusion

The LM2852XMXA-3.3 is a high-performance monolithic dc-to-dc converter with a stepped-current limit and a fixed 3.3V output voltage, suitable for powering various logic, microprocessor, and system logic power supplies. It is an ideal device for supplying modern microprocessors, digital signal processors, ASICs, ASSPs, and system logic power supplies. The device offers an integrated single-ended forward converter with synchronous rectification, offering a wide input range, adjustable switching frequency, over current protection, adjustable current limit, over temperature shutdown, and power-good signal.

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