LTC3890-2

RECOMMENDED FOR NEW DESIGNS

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

Data Sheet (Rev. A) Product Selection Table
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Overview

  • 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 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
  • Low Shutdown IQ : < 14µA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • Small Low Profile (0.75mm) 5mm × 5mm QFN Package
  • AEC-Q100 Qualified for Automotive Applications

The LTC3890-2 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. 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 mode control limits the inductor current during short-circuit conditions. The PLLIN/MODE pin selects among Burst Mode operation, pulse-skipping mode, or continuous conduction mode at light loads. For versions with different and/or additional features, see the LTC3890 family summary, Table 1, in the Pin Functions section of this data sheet.

LTC3890 LTC3890-1 LTC3890-2 LTC3890-3
Adjustable Current 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 5X5 QFN-32 SSOP-28 5X5 QFN-32 SSOP-28

Applications

  • Automotive Always-On Systems
  • Battery Operated Digital Devices
  • Distributed DC Power Systems
LTC3890-2
60V Low IQ, Dual, 2-Phase Synchronous Step-Down DC/DC Controller
High Efficiency Dual 8.5V/3.3V Output Step-Down Converter Efficiency and Power Loss vs Output Current Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 2
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
LTC4417
RECOMMENDED FOR NEW DESIGNS Prioritized PowerPath™ Controller
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Tools & Simulations

LTspice 3

Models for the following parts are available in LTspice:

  • LTC3890
  • LTC3890-1
  • LTC3890-2
  • LTC3890-3

LTpowerCAD 3

Design tools for the following parts are available in LTpowerCAD:

  • LTC3890
  • LTC3890-2
LTspice

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

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

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
schematic 6
DC2236A-A

LTC3890EUH-2 Demo Board | 16V ≤ VIN ≤ 60V; VOUT = 12V @ 25A

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Product Details

Demonstration circuit 2236A-A is a high output voltage, high efficiency synchronous PolyPhase® buck converter featuring the LTC3890EUH-2. The DC2236A-A has a 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-A 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.
DC2236A-A
LTC3890EUH-2 Demo Board | 16V ≤ VIN ≤ 60V; VOUT = 12V @ 25A
DC2236A-B Demo Board DC2236A-B Demo Board DC2236A-B Demo Board DC2236A-B Demo Board DC2236A-B Demo Board DC2236A-A - Schematic

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