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LTC3890-1 - 60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller

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

Typical Application

LTC3890-1 Typical Application
LTC3890-1 Typical Application

Description

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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

SSOP-28

LTC3890-1 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3890EGN-1#PBF SSOP 32 E $6.80 $4.76 View
LTC3890EGN-1#TRPBF SSOP 32 E $4.82 View
LTC3890EUH#PBF QFN 32 E $6.97 $4.88 View
LTC3890EUH#TRPBF QFN 32 E $4.94 View
LTC3890HGN-1#PBF SSOP 28 H $8.36 $5.85 View
LTC3890HGN-1#TRPBF SSOP 28 H $5.91 View
LTC3890HUH#PBF QFN 32 H $8.50 $5.95 View
LTC3890HUH#TRPBF QFN 32 H $6.01 View
LTC3890IGN-1#PBF SSOP 32 I $7.82 $5.47 View
LTC3890IGN-1#TRPBF SSOP 32 I $5.53 View
LTC3890IUH#PBF QFN 32 I $7.99 $5.59 View
LTC3890IUH#TRPBF QFN 32 I $5.65 View
LTC3890MPGN-1#PBF SSOP 28 MP $22.57 $15.80 View
LTC3890MPGN-1#TRPBF SSOP 28 MP $15.86 View
LTC3890MPUH#PBF QFN 32 MP $23.00 $16.10 View
LTC3890MPUH#TRPBF QFN 32 MP $16.16 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology demo boards are offered free of charge to qualified customers. Contact your local sales office or distributor to request a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1244A LTC3890EGN-1 Demo Board | High Voltage, Low IQ, Dual 2-Phase Synchronous Step-Down Controller $175.00
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Applications

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

Simulate

LTspice IV is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. To download LTspice IV and other FREE simulation tools, please visit our Design Simulation page.

To launch a ready to run LTspice demonstration circuit for this part:

  • Step 1: If you have not installed LTspice on this computer, download and install LTspice IV
  • Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
  • Step 3: If LTspice IV does not automatically open after clicking the link above, 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

To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.

Related models available in LTspice IV
LTC3890-1
LTC3890

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