LT3120

Name: LT3120
Brand: Analog Devices
Price: 5.15 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

26V, 9A Low-I_Q CC/CV Monolithic Buck-Boost Converter

Data Sheet (Rev. 0) Product Selection Table

Part Models: 1
1ku List Price: Starting From $5.15

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Overview

Input Voltage Range: 2.5V to 26V
0.8V to 24V Output Voltage Range
High Output Current
- 6.5A with V_OUT = 5V, V_IN > 6V
- 3A with V_OUT = 5V, V_IN = 3V
- 6.5A with V_OUT = 12V, V_IN > 14V
- 4 A with V_OUT = 12V, V_IN = 9V
Ultralow Noise Buck-Boost Architecture
Programmable Output Current Limit

Programmable Frequency Range: 400kHz to 2MHz
Accurate Enable Comparator Threshold
Burst Mode^® Operation, No-Load I_Q = 35μA
Current Mode Control
External Clock Synchronization
Maximum Power Point Control
28-Lead 4mm × 5mm LQFN Package

Part Models: 1
1ku List Price: Starting From $5.15

Documentation

Data Sheet 1

LT3120: 26V, 9A Low-I_Q CC/CV Monolithic Buck-Boost Converter Data Sheet (Rev.0) 05/04/2021

User Guide 1

DC2815A Demo Manual (Rev.0) 06/18/2021

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
LT3120JV#PBF	28-Lead LQFN (5mm x 4mm x 0.74mm)	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LT3120

LTpowerCAD 1

LT3120 Example Design - 12Vin to 5Vout 6.5A max

Design tools for the following parts are available in LTpowerCAD:

LT3120

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTpowerCAD^® is a power supply design program which selects power stage components, provides detailed power efficiency, shows quick loop Bode plot stability and load transient analysis, and can export to LTspice for simulation.

Evaluation Kits

LT3120 | 26V, 9A Synchronous Buck-Boost DC/DC Converter with Accurate Programmable Output Current Limit

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Product Details

Demonstration circuit 2815A features the LT3120, as wide operating range synchronous monolithic buck-boost converter with programmable output current limit.

The DC2815A demo board has four user selectable operating modes:

An accurate programmable EN/UVLO pin which is used to ENABLE the converter (JP1).
Programmable MPPC (Maximum Power Point Control) for Input Regulation Set Point (JP2).
Burst Mode^® operation and External CLK/Fixed Frequency PWM (JP3).
Programmable Output Average Current Limit Set Point (JP4).

The LT3120 uses average current mode control to simplify voltage loop compensation and provide good line and load transient response.

The DC2815A operates with a 2.5V to 26V input voltage range. The demo board has been designed with the output voltage set to 5V. The LT3120 incorporates a proprietary low noise switching algorithm which optimizes efficiency with input voltages above, below or equal to the output voltage and ensures seamless transitions between operating modes.

In PWM mode, the switching frequency can operate between 400kHz to 2MHz by programming the RT resistor R5. LT3120 can be synchronized to an External CLK provided RT is programmed 25% to 50% below the synchronization frequency.

The LT3120 has an optional programmable current limit that can be used to control the output current. The current limit circuit requires an external sense resistor connected between ISP and ISN and the current limit value can be set by adjusting R6 and C26 connected to PROG pin.

LT3120 also has programmable MPPC feature to set the input regulation voltage and can be adjusted by changing R13, R14 and C28.

The LT3120 data sheet has detailed information about the operation, specifications, and applications of the part. The data sheet should be read in conjunction with the DC2815A quick start guide.