LT3688

PRODUCTION

Dual 800mA Step-Down Switching Regulator with Power-On Reset and Watchdog Timer

Data Sheet Product Selection Table

Part Models: 10
1ku List Price: Starting From $4.31

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Part Details

Wide Input Range:
- Operation from 3.8V to 36V
Low Ripple (<25mV_P-P ) Burst Mode Operation:
- I_Q = 115μA at 12V_IN to 3.3V and 5V
Programmable, Defeatable Window Watchdog Timer
Two Independently Programmable Power-On-Reset Timers
Synchronizable, Adjustable 350kHz-2.2MHz Switching Frequency
Two 800mA Output Switching Regulators with Internal Power Switches
Programmable Input Undervoltage Lockout with Hysteresis
Thermally Enhanced 24-Pin TSSOP and 4mm × 4mm QFN Packages

Part Models: 10
1ku List Price: Starting From $4.31

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
LT3688EFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688EFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688EUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688EUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688HFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688HFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688IFE#PBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688IFE#TRPBF	24-Lead TSSOP w/ EP	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688IUF#PBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LT3688IUF#TRPBF	24-Lead QFN (4mm x 4mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3688EFE#PBF	PRODUCTION
LT3688EFE#TRPBF	PRODUCTION
LT3688HFE#PBF	PRODUCTION
LT3688HFE#TRPBF	PRODUCTION
LT3688IFE#PBF	PRODUCTION
LT3688IFE#TRPBF	PRODUCTION
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products
		PCN21_0269_Form Material_Report Detailed Change Description Qualification Results Summary
LT3688EUF#PBF	PRODUCTION
LT3688EUF#TRPBF	PRODUCTION
LT3688IUF#PBF	PRODUCTION
LT3688IUF#TRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT3688

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

LT3688EFE Demo Board | 7V ≤ VIN ≤ 36V, 60V Transients, VOUT1 = 5V @ 0.8A, VOUT2 = 3.3V @ 0.8A

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Product Details

Demonstration circuit 1439A is an adjustable dual monolithic step-down switching regulator with two adjustable power-on reset timers and an adjustable watchdog timer. The regulator operates off inputs up to 36V and withstands transients up to 60V. The two buck outputs are capable of generating up to 800mA each and both of them have independent RUN/SS function.

Resources

DC1439A - Demo Manual
404.00K

DC1439A - Design Files
2.00M

DC1439A - Schematic
73.00K

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