LA5735M-TLM-E

Voltage - Output (Min/Fixed):	1.23V
Base Part Number:	LA5735
Supplier Device Package:	8-MFP
Package / Case:	8-SOIC (0.173", 4.40mm Width)
Mounting Type:	Surface Mount
Operating Temperature:	-30°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	300kHz
Current - Output:	700mA (Switch)
Voltage - Output (Max):	32V
Series:	--
Voltage - Input (Max):	32V
Voltage - Input (Min):	4.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction

The LA5735M-TLM-E is a 5A step-down converter for system power supplies. It is an extremely flexible converter, suitable for a variety of system power supply architectures. It offers up to 5A of output current at up to 3V output voltage and can operate from an input voltage of 20V. The LA5735M-TLM-E is classified as a DC DC Switching Regulator and is typically found in the Power Management IC (PMIC) category.

Outline Specifications

The LA5735M-TLM-E is a 5A step-down converter with a very low quiescent current of only 6μA in the PWM mode. It operates with an input voltage range of 6 to 20V, and has an input current limit of up to 10A. It also provides an output voltage range of 0.7V to 3V over a wide temperature range of -40°C to 125°C.

Application Fields

The LA5735M-TLM-E is ideal for portable consumer applications such as mobile phones, personal digital assistants (PDAs), camcorders and digital cameras. In addition, it is also suitable for development boards and embedded systems.

Working Principle

The LA5735M-TLM-E is a low-output voltage, high-performance step-down converter that utilizes a single-stage synchronous rectification technique. The device also features an internal voltage tracker.The input voltage is regulated to the desired output voltage by the on-chip comparator circuit that senses the output voltage. When the output voltage is lower than the set value, the comparator outputs a logic high voltage to activate the switches and convert the input voltage to the output voltage. In this way, the input voltage is regulated to the desired output voltage.The main switches are configured to increase the inductor current to the desired range. An oscillator circuit is used to regulate the frequency of the pulse width modulated (PWM) signals. The PWM signals control the main switches and the synchronous rectifier.When the PWM signals are high, the main switches are opened and the synchronous rectifier is disabled. This allows the inductor current to decrease, resulting in a step-down conversion. When the PWM signals are low, the circuit is connected in a buck-boost configuration, where the inductor current is increased and the output voltage is regulated.

Conclusion

The LA5735M-TLM-E is a high-performance, high-efficiency step-down converter for system power supplies. It operates with an input voltage range of 6-20V, and offers up to 5A of output current at up to 3V. Its features include a low quiescent current, an internal voltage tracker, and a pulse width modulation circuit for regulating the frequency of the PWM signals. This device is ideally suited for portable consumer applications such as mobile phones, PDAs, camcorders, and digital cameras.

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