LTC3890
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3890

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 14
1ku List Price Starting From $5.48
Features
  • Wide VIN Range: 4V to 60V (65V Abs Max)
  • Low Operating IQ: 50µA (One Channel On)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • RSENSE 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 IQ : < 14µA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Small Low Profile (0.75mm) 5mm × 5mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications
Additional Details
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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

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

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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)

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LTC3890MPUH#TRPBF

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Jul 31, 2020

- 20_0245

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Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan)

LTC3890EUH#PBF

PRODUCTION

LTC3890EUH#TRPBF

PRODUCTION

LTC3890EUH#WPBF

PRODUCTION

LTC3890EUH#WTRPBF

PRODUCTION

LTC3890HUH#PBF

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LTC3890HUH#TRPBF

PRODUCTION

LTC3890HUH#WPBF

PRODUCTION

LTC3890HUH#WTRPBF

PRODUCTION

LTC3890IUH#PBF

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LTC3890IUH#TRPBF

PRODUCTION

LTC3890IUH#WPBF

PRODUCTION

LTC3890IUH#WTRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC2236A-B

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

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DC2236A-B

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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

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