LM34925SD/NOPB

Voltage - Output (Min/Fixed):	1.225V
Base Part Number:	LM34925
Supplier Device Package:	8-LLP-EP (4x4)
Package / Case:	8-WDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	Adj to 1MHz
Current - Output:	100mA
Voltage - Output (Max):	100V
Series:	--
Voltage - Input (Max):	100V
Voltage - Input (Min):	7.5V
Number of Outputs:	2
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive, Isolation Capable
Function:	Step-Down
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LM34925SD/NOPB application fields

The LM34925SD/NOPB device is an integrated controller and current-mode PWM switching regulator with an adjustable output voltage from an 5.5V input. It is a high-performance, cost-effective synchronous DC/DC buck regulator for battery powered applications and other applications where low input and output voltages are required. The LM34925SD/NOPB device can be used in a variety of applications such as notebook computer power supplies, telecom systems, DSL modems, IC test equipment, and lighting applications.

Overview of LM34925SD/NOPB

The LM34925SD/NOPB has a dual programmable loop, enabling it to support both voltage and current modes of operation. It has an integrated oscillator and two step-down converters with power MOSFET devices. It also includes a voltage comparator for overcurrent protection. The LM34925SD/NOPB starts in a low quiescent current mode and is capable of providing up to 400mA of continuous output current. The LM34925SD/NOPB also includes adjustable power saving modes using the PIN or register programming. These power saving modes include adjustable operating frequency and a low quiescent current mode for maximum efficiency at light load conditions. The LM34925SD/NOPB also includes over temperature protection and a power-on reset feature.

Working principle of LM34925SD/NOPB

The LM34925SD/NOPB is designed to switch regulated power at the desired output voltage level. It is a synchronous, current-mode switching regulator with an adjustable output voltage from 0.45V to 8V. Its output voltage is controlled by the voltage feedback signal and an error signal produced by the integrated comparator. The error signal is compared to the signal generated by the current through the P-channel power MOSFET. If the voltage feedback signal exceeds the voltage threshold, the output voltage is linearly reduced. The output voltage is achieved by comparing the error signal to the signal generated by a current in the N-channel MOSFET, then the resulting output voltage will be the same as the voltage feedback signal.The LM34925SD/NOPB device also includes current-limiting, over-voltage and over-temperature protection. The over-voltage protection detects when an output voltage exceeds the programmed threshold, and will shut off the device if it is too high. The over-temperature protection monitors the temperature of the device and will shut it off if it exceeds the programmed threshold. It will also reset the regulator when the temperature drops below the over-temperature limit.The LM34925SD/NOPB is designed to provide high performance regulation with low power consumption. It provides regulated output voltages in a wide range of applications and can be used in both positive and negative voltage regulator systems. It is designed to operate over a temperature range of -40 to 125°C and is suitable for battery powered applications.

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