LM5116MH/NOPB

Frequency - Switching:	200kHz, 535kHz
Base Part Number:	LM5116
Supplier Device Package:	20-HTSSOP
Package / Case:	20-PowerTSSOP (0.173", 4.40mm Width)
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	6 V ~ 100 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LM5116MH/NOPB Application Field and Working Principle

The LM5116MH/NOPB is a switching regulator controller integrated circuit (IC) designed to operate as a synchronous buck converter for utilization in applications such as DC-DC power supplies and charge pumps. This IC utilizes employment of both external high and low side FETs with selectable current limit and adjustable loop compensation. The LM5116 provides several features that make it best suited for power management, personal computers, servers, and telecommunications systems.

Features of LM5116MH/NOPB

The LM5116MH/NOPB has many features that give it a competitive edge over other DC-DC switching controllers. Some of the key features are listed here:

• Synchronous operation
• Wide Input voltage ranging from 4.5 V to 100 V
• Integrated 4A/8A/12A integrated high-side and low-side FETs, selectable current limit
• External compensation with adjustable output voltage, peak current limit and switching frequency
• Predictable current and voltage waveforms
• Low Output voltage ripple
• Output short circuit protection
• Thermal shutdown protection
• Under/overvoltage protection

Applications

The LM5116MH/NOPB offers a wide range of applications such as DC-DC converters, power supplies, and chargers for notebook computers, PDAs and mobile phones. It is also suitable for a variety of automotive and industrial applications such as laptops, desktop computers, copiers, telephones and printer power supplies.

Working Principle

The LM5116MH/NOPB uses a switching topology to convert the input voltage to a desired output voltage or current. It employs two external FETs in both the high-side and low-side of the load, with a selectable current limit feature. The working principle of this IC is to control the voltage at the output of the regulator just as it would occur if a linear regulator was used. The IC works by sensing the output voltage and then compensating by switching the FETs accordingly. The input voltage is sampled to determine the FET current limit, while the output voltage is sampled as feedback control to keep the output voltage constant. The synchronization of the LM5116 can be programmed through the Frequency Sync pin to synchronize with an external clock if needed. The output voltage is adjusted through the output voltage setting pin or via an external feedback resistor. The output voltage ripple is minimized by an active high-pass filter at the output stage. A capacitor connected to the output voltage setting pin serves as a bulk capacitor.

Conclusion

The LM5116MH/NOPB is a well-featured switching regulator controller IC that provides a wide input voltage range, adjustable output voltage and selectable current limit. It also provides a slew of protection features such as undervoltage protection, overvoltage protection, output short circuit protection, and extended temperature range operation. Due to its wide range of features, the LM5116MH/NOPB can be employed in a variety of applications such as DC-DC power supplies and charge pumps, as well as in automotive, industrial and consumer electronics applications.

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