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LTC2960 - 36V Nano-Current Two Input Voltage Monitor

LTC2974 - 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement

LTC3890 - 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
  • 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

Typical Application

LTC3890 Typical Application
LTC3890 Typical Application

Description

The LTC®3890 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.

Packaging

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

QFN-32

LTC3890 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3890EGN-1#PBF SSOP 28 E $6.80 $4.76 View
LTC3890EGN-1#TRPBF SSOP 28 E $4.82 View
LTC3890EGN-3#PBF SSOP 28 E $6.80 $4.76 View
LTC3890EGN-3#TRPBF SSOP 28 E $4.82 View
LTC3890EUH#PBF QFN 32 E $6.97 $4.88 View
LTC3890EUH#TRPBF QFN 32 E $4.94 View
LTC3890EUH-2#PBF-ES QFN 32 E $6.97 $4.88 View
LTC3890EUH-2#TRPBF-ES 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
LTC3890HGN-3#PBF SSOP 28 H $8.36 $5.85 View
LTC3890HGN-3#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
LTC3890HUH-2#PBF QFN 32 H $8.50 $5.95 View
LTC3890HUH-2#TRPBF QFN 32 H $6.01 View
LTC3890IGN-1#PBF SSOP 28 I $7.82 $5.47 View
LTC3890IGN-1#TRPBF SSOP 28 I $5.53 View
LTC3890IGN-3#PBF SSOP 28 I $7.82 $5.47 View
LTC3890IGN-3#TRPBF SSOP 28 I $5.53 View
LTC3890IUH#PBF QFN 32 I $7.99 $5.59 View
LTC3890IUH#TRPBF QFN 32 I $5.65 View
LTC3890IUH-2#PBF QFN 32 I $7.99 $5.59 View
LTC3890IUH-2#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
LTC3890MPGN-3#PBF SSOP 28 MP $22.57 $15.80 View
LTC3890MPGN-3#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
LTC3890MPUH-2#PBF QFN 32 MP $23.00 $16.10 View
LTC3890MPUH-2#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 offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about 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
DC1804A LTC3890EUH Demo Board VIN = 16V to 60V, VOUT = 12V @ 25A $200.00
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Applications

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

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Related models available in LTspice IV
LTC3890-1
LTC3890
LTC3890-2
LTC3890-3

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