LTC3890-1
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3890-1

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 8
1ku List Price Starting From $5.33
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
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start or Tracking
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Low Shutdown IQ: <14μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Narrow SSOP Package
Additional Details
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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

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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LTC3890IGN-1#PBF
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Aug 10, 2022

- 22_0177

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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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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Filter by Model

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Reset Filters

Part Models

Product Lifecycle

PCN

Aug 10, 2022

- 22_0177

arrow down

Laser Top Mark Conversion for QSOP20_24_28 Assembled in ADPG [PNG] and UTL

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

arrow down

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

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

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PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC1244A

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

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DC1244A

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

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

Product Detail

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.


 


reference details image

DC2299A-B

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

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DC2299A-B

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

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

Product Detail

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.

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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