LTC3418 - 8A, 4MHz, Monolithic Synchronous Step-Down Regulator

Features

• Click Here For LTC3418 Evaluation Kits
• High Efficiency: Up to 95%
• 8A Output Current
• 2.25V to 5.5V Input Voltage Range
• Low R_DS(ON) Internal Switch: 35mΩ
• Tracking Input to Provide Easy Supply Sequencing
• Programmable Frequency: 300kHz to 4MHz
• 0.8V ±1% Reference Allows Low Output Voltage
• Quiescent Current: 380μA
• Selectable Forced Continuous/Burst Mode® Operation with Adjustable Burst Clamp
• Synchronizable Switching Frequency
• Low Dropout Operation: 100% Duty Cycle
• Power Good Output Voltage Monitor
• Overtemperature Protected
• 38-Lead Low Profile (0.75mm) Thermally Enhanced QFN (5mm × 7mm) Package

Typical Application

Description

The LTC3418 is a high efficiency, monolithic synchronous step-down DC/DC converter utilizing a constant frequency, current mode architecture. It operates from an input voltage range of 2.25V to 5.5V and provides a regulated output voltage from 0.8V to 5V while delivering up to 8A of output current. The internal synchronous power switch increases efficiency and eliminates the need for an external Schottky diode. Switching frequency is set by an external resistor or can be synchronized to an external clock. OPTI-LOOP® compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The LTC3418 can be configured for either Burst Mode operation or forced continuous operation. Forced continuous operation reduces noise and RF interference while Burst Mode operation provides high efficiency by reducing gate charge losses at light loads. In Burst Mode operation, external control of the burst clamp level allows the output voltage ripple to be adjusted according to the requirements of the application. A tracking input in the LTC3418 allows for proper sequencing with respect to another power supply.

Packaging

QFN-38

Order Info

• Part numbers ending in PBF are lead free. Please contact LTC marketing for information on lead based finish parts.
• Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
• Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number	Package	Pins	Temp	Price (1-99)	Price (1k)*	RoHS Data
LTC3418EUHF	QFN	38	E	$8.19	$5.73	View
LTC3418EUHF#PBF	QFN	38	E	$8.19	$5.73	View
LTC3418EUHF#TR	QFN	38	E		$5.79	View
LTC3418EUHF#TRPBF	QFN	38	E		$5.79	View
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^* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Evaluation Kits

Part Number	Description	Price
DC785A	LTC3418EUHF | 8A Monolithic, Synchronous Step-Down Regulator, 2.25V to 5.5Vin, Jumper Selectable, 1.2, 1.5, 1.8Vout @ 8A(max)	$100.00
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Applications

• Microprocessor, DSP and Memory Supplies
• Distributed 2.5V, 3.3V and 5V Power Systems
• Automotive Applications
• Point of Load Regulation
• Notebook Computers

Simulate

LTSpice / SwitcherCAD III is a powerful FREE circuit simulator and schematic capture program, providing macro models for 80% of Linear Technology's switching regulators, over 200 op amp models, as well as resistors, transistors and MOSFET models.

• Step 1. If you do not already have a copy of LTSpice, click here to download and install LTSpice / SwitcherCAD III
  
  
• Step 2. Once LTSpice is installed, click here for a ready to run demonstration circuit of the LTC3418.
  
  
• Step 3. If LTspice / SwitcherCAD III does not automatically open after clicking the above link, you can instead run the simulation by right clicking on the link and selecting “Save Target As”. After saving the file to your computer, start LTSpice and open the demonstartion circuit by selecting "Open" from the "File" menu.