LTC3890

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. D) Product Selection Table

Part Models: 14
1ku List Price: Starting From $5.48

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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
Selectable Current Limit

Very Low Dropout Operation: 99% Duty Cycle
Adjustable Output Voltage Soft-Start or Tracking
Power Good Output Voltage Monitors
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
Small Low Profile (0.75mm) 5mm × 5mm QFN Package
AEC-Q100 Qualified for Automotive Applications

The LTC3890 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 noise due to the ESR of the input capacitor are minimized by operating the two controller output stages out-of-phase.

The 50μA no-load quiescent current extends operating run time in battery-powered systems. OPTI-LOOP^® compensation allows the transient response to be optimized over a wide range of output capacitance and ESR values. The LTC3890 features a precision 0.8V reference and power good output indicators. 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 leaded package version (28-lead Narrow SSOP), see the LTC3890-1 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: 14
1ku List Price: Starting From $5.48

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
LTC3890EUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890EUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890EUH#WPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890EUH#WTRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890HUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890HUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890HUH#WPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890HUH#WTRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890IUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890IUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890IUH#WPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890IUH#WTRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890MPUH#PBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys
LTC3890MPUH#TRPBF	32-Lead QFN (5mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

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
LTC3890EUH#PBF	PRODUCTION
LTC3890EUH#TRPBF	PRODUCTION
LTC3890EUH#WPBF
LTC3890EUH#WTRPBF
LTC3890HUH#PBF	PRODUCTION
LTC3890HUH#TRPBF	PRODUCTION
LTC3890HUH#WPBF
LTC3890HUH#WTRPBF
LTC3890IUH#PBF	PRODUCTION
LTC3890IUH#TRPBF	PRODUCTION
LTC3890IUH#WPBF
LTC3890IUH#WTRPBF
LTC3890MPUH#PBF	PRODUCTION
LTC3890MPUH#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 5

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

LTC3890EUH Demo Board | 16V ≤ VIN ≤ 60V; VOUT = 12V @ 25A

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Product Details

Demonstration circuit 2236A-B is a high output voltage, high efficiency synchronous PolyPhase^® buck converter featuring the LTC3890EUH. The DC2236A-B has wide input voltage range of 16V up to 60V, and is capable of delivering up to 25A of output current. The output voltage is set to 12V, however, the output voltage can go as high as 24V, with certain modifications. The DC2236A-B supports three operation modes: Fixed frequency modulation, pulse-skipping and Burst Mode^® operation. Fixed frequency mode of operation maximizes the output current, reduces output voltage ripple, and yields a low noise switching spectrum. Burst Mode employs a variable frequency switching algorithm that minimizes the no-load input quiescent current and improves efficiency at light loads.

Resources

DC2236A-B - Demo Manual
514.00K

DC2236A-B - Schematic
49.00K

DC2236A-B - Design Files
4.00M

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LTC3890

Part Details

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Design Note 3

Technical Articles 3

Product Selection Guide 1

Product Selector Card 1