LT3690

PRODUCTION

36V, 4A, 1.5MHz Synchronous Step-Down Switching Regulator with 70μA Quiescent Current

Data Sheet (Rev. C) Product Selection Table

Part Models: 8
1ku List Price: Starting From $5.90

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Part Details

Wide Input Range:
- Operation from 3.9V to 36V
- Overvoltage Lockout Protects Circuits Through 60V Transients
4A Maximum Output Current
Integrated 30mΩ N-Channel Synchronous Switch
Low Ripple (<15mV_P-P) Burst Mode^® Operation: I_Q = 70µA at 12V_IN to 3.3V_OUT
Programmable Input Undervoltage Lockout

0.8V Feedback Reference Voltage
Output Voltage: 0.8V to 20V
Programmable and Synchronizable Oscillator (170kHz to 1.5MHz)
Soft-Startup and Output Voltage Tracking
Short-Circuit Robust
Power Good Flag
Small Thermally Enhanced 4mm × 6mm QFN Package

Part Models: 8
1ku List Price: Starting From $5.90

Documentation

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
LT3690EUFE#PBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690EUFE#TRPBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690HUFE#PBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690HUFE#TRPBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690IUFE#PBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690IUFE#TRPBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690MPUFE#PBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3690MPUFE#TRPBF	26-Lead QFN (6mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

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

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Digital Power System Managers 1
LTC2974	RECOMMENDED FOR NEW DESIGNS	4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Dual-Supply Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
High Voltage Hot Swap Controllers 1
LTC4364	RECOMMENDED FOR NEW DESIGNS	Surge Stopper with Ideal Diode
PowerPath, Ideal Diodes, and Load Switches 1
LTC4359	RECOMMENDED FOR NEW DESIGNS	Ideal Diode Controller with Reverse Input Protection

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3690

3-D Design Model 1

LT3690 3D Design Model

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.

Evaluation Kits

LT3690EUFE Demo Board | 4.5V ≤ VIN ≤ 36V, VOUT = 3.3V @ 4A, FSW = 450kHz

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Product Details

Demonstration circuit 1520A is a 36V, 4A synchronous Buck Regulator with 70μA Quiescent Current featuring the LT3690. The demo board is designed for 3.3V output from a 4.5V to 36V input with transient up to 60V. The wide input range of the LT3690 allows a variety of input sources, such as automotive batteries and industrial supplies. The switching frequency can be programmed either via oscillator resistor or external clock over a 170kHz to 1.5MHz range.

Resources

DC1520A - Schematic
72.00K

DC1520A - Design Files
1.00M

DC1520A - Demo Manual
204.00K

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