LTC3890-1

RECOMMENDED FOR NEW DESIGNS

60V Low I_Q, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

Part Models: 8
1ku List Price: Starting From $5.33

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Part Details

Wide V_IN Range: 4V to 60V (65V Abs Max)
Low Operating I_Q: 50μA (One Channel On)
Wide Output Voltage Range: 0.8V ≤ V_OUT ≤ 24V
R_SENSE or DCR Current Sensing
Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
Phase-Lockable Frequency (75kHz to 850kHz)
Programmable Fixed Frequency (50kHz to 900kHz)
Selectable Continuous, Pulse-Skipping or Low Ripple Burst Mode^® Operation at Light Loads
Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Power Good Output Voltage Monitor
Output Overvoltage Protection
Low Shutdown I_Q: <14μA
Internal LDO Powers Gate Drive from V_IN or EXTV_CC
No Current Foldback During Start-Up
Narrow SSOP Package

The LTC3890-1 is a high performance dual step-down switching regulator DC/DC controller that drives all N-channel synchronous power MOSFET stages. A constant frequency current mode architecture allows a phase-lockable frequency of up to 850kHz. Power loss and supply noise are minimized by operating the two controller output stages out-of-phase.

The 50μA no-load quiescent current extends operating life in battery-powered systems. OPTI-LOOP^® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. A wide 4V to 60V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.

Independent TRACK/SS pins for each controller ramp the output voltages during start-up. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads.

For a leadless 32-pin QFN package with additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3890 data sheet.


	LTC3890	LTC3890-1	LTC3890-2	LTC3890-3
Adjustable Current Limit	Limit Yes	No	Yes	No
CLKOUT/PHASMD for Multiphase Operation	Yes	No	Yes	No
Number of PGood Outputs	2	1	2	1
OVP – Bottom Gate Crowbar	Yes	Yes	No	No
Current Limit Foldback	Yes	Yes	No	No
Light Load Operation when Synced to External Clock	Forced Continuous	Forced Continuous	Pulse Skipping	Pulse Skipping
SENSE Pins Common Mode Range	Common Mode < 0.5V Requires VFB < 0.65V	Common Mode < 0.5V Requires VFB < 0.65V	Not Dependant on VFB. Easy to make a non-synchronous Boost or SEPIC	Not Dependant on VFB. Easy to make a non-synchronous Boost or SEPIC
Package	5 × 5 QFN-32	SSOP-28	5 × 5 QFN-32	SSOP-28

Applications

Automotive Always-On Systems
Battery Operated Digital Devices
Distributed DC Power Systems

Part Models: 8
1ku List Price: Starting From $5.33

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
LTC3890EGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890EGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890HGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890HGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890IGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890IGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890MPGN-1#PBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890MPGN-1#TRPBF	28-Lead SSOP (Narrow 0.15 Inch)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 3, 2024 - 24_0235 (QSOP/SSOP PKG) Migrating Bottom Trace Code Marking to Top Side Laser Marking
		PCN24_0235_Form Material_Report Other Delta Qualification Matrix
LTC3890EGN-1#PBF	PRODUCTION
LTC3890EGN-1#TRPBF	PRODUCTION
LTC3890HGN-1#PBF	PRODUCTION
LTC3890HGN-1#TRPBF	PRODUCTION
LTC3890IGN-1#PBF	PRODUCTION
LTC3890IGN-1#TRPBF	PRODUCTION
Aug 10, 2022 - 22_0177 Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL
		PCN22_0177_Form Material_Report Delta Qualification Matrix
LTC3890EGN-1#PBF	PRODUCTION
LTC3890EGN-1#TRPBF	PRODUCTION
LTC3890HGN-1#PBF	PRODUCTION
LTC3890HGN-1#TRPBF	PRODUCTION
LTC3890IGN-1#PBF	PRODUCTION
LTC3890IGN-1#TRPBF	PRODUCTION
LTC3890MPGN-1#PBF	PRODUCTION
LTC3890MPGN-1#TRPBF	PRODUCTION
Jul 31, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)
		PCN20_0245_Form Material_Report Delta Qualification Matrix Other Qualification Results Summary
LTC3890EGN-1#PBF	PRODUCTION
LTC3890EGN-1#TRPBF	PRODUCTION
LTC3890HGN-1#PBF	PRODUCTION
LTC3890HGN-1#TRPBF	PRODUCTION
LTC3890IGN-1#PBF	PRODUCTION
LTC3890IGN-1#TRPBF	PRODUCTION
LTC3890MPGN-1#PBF	PRODUCTION
LTC3890MPGN-1#TRPBF	PRODUCTION

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

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
Multiple Output Buck Regulators 1
LTC3880	RECOMMENDED FOR NEW DESIGNS	Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit

Tools & Simulations

LTspice 1

LTC3890-1 Demo Circuit - Dual Output Step-Down (4.5-60V to 8.5V @ 3A & 3.3V @ 5A)

Models for the following parts are available in LTspice:

LTC3890
LTC3890-1
LTC3890-2
LTC3890-3

LTpowerCAD 2

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

LTC3890EGN-1 Demo Board | 4.5V ≤ VIN ≤ 60V, VOUT1 = 3.3V @ 5A, VOUT2 = 8.5V @ 3A

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Product Details

Demonstration circuit 1244 is a Low Quiescent Current, Dual Output Synchronous Buck Converter featuring the LTC3890EGN-1. DC1244 converts a 4.5V to 60V voltage source to 3.3V at 5.0A and 8.5V at 3.0A. When the input voltage is close to or below 9V, the 8.5V output enters dropout mode.The "-1" version has a fixed current limit and current foldback. See data sheet for other differences.

Resources

DC1244A - Demo Manual
732.00K

DC1244A - Design Files
1.00M

DC1244A - Schematic
42.00K

LTC3890EGN-1 Demo Board | 6V ≤ VIN ≤ 60V; VOUT1 = 5V @ 8A, VOUT2 = 12V @ 5A

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Product Details

Demonstration circuit 2299A is a high input voltage, high efficiency synchronous dual output buck converter featuring the LTC3890EGN. The DC2299A has a wide input voltage range of 6V to 60V. The output voltages are set to 5V and 12V, however, the output voltage can go as high as 24V, with certain modifications. This demo board is capable of delivering up to 8A from the 5V output and up to 5A from the 12V output.

Resources

DC2299A - Demo Manual
372.00K

DC2299A - Design Files
1.00M

DC2299A - Schematic
53.00K

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LTC3890-1

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Product Selector Card 1

Hardware Ecosystem

Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

LTpowerCAD 2

Evaluation Kits

Product Details

Resources

Product Details

Resources

Latest Discussions

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