Power Management Switching Regulator Step-Down (Buck) Regulators Multiple Output Buck
Power Management Switching Regulator Step-Down (Buck) Regulators External Power Switch Buck Controllers

LTC2960 - 36V Nano-Current Two Input Voltage Monitor

LTC3880 - Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management

LTC3858-1 - Low IQ, Dual 2-Phase Synchronous Step-Down Controller

Features

  • Low Operating IQ: 170μA (One Channel On)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 24V
  • Wide VIN Range: 4V to 38V
  • RSENSE or DCR Current Sensing
  • Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
  • OPTI-LOOP® Compensation Minimizes COUT
  • Phase-Lockable Frequency (75kHz-850kHz)
  • Programmable Fixed Frequency (50kHz-900kHz)
  • Selectable Continuous, Pulse-Skipping or Burst Mode® Operation at Light Loads
  • Very Low Dropout Operation: 99% Duty Cycle
  • Adjustable Output Voltage Soft-Start
  • Power Good Output Voltage Monitor
  • Output Overvoltage Protection
  • Output Latch-Off Protection During Short Circuit
  • Low Shutdown IQ: 8μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Tiny 4mm × 5mm QFN and Narrow SSOP Packages

Typical Application

LTC3858-1 Typical Application
LTC3858-1 Typical Application

Description

The LTC3858-1 is a high performance dual step-down switching regulator 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 input capacitor ESR are minimized by operating the two controller outputs out of phase.

The 170μA 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. The LTC3858-1 features a precision 0.8V reference and a power good output indicator. A wide 4V to 38V input supply range encompasses a wide range of intermediate bus voltages and battery chemistries.

Independent soft-start pins for each controller ramp the output voltages during start-up. The output latch-off feature protects the circuit in short-circuit conditions.

For a leadless 32-pin QFN package with the additional features of adjustable current limit, clock out, phase modulation and two PGOOD outputs, see the LTC3858 data sheet.

Packaging

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

QFN-28,SSOP-28

LTC3858-1 Package Drawing
LTC3858-1 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LTC3858EGN-1#PBF SSOP 28 E $6.39 $4.47 View
LTC3858EGN-1#TRPBF SSOP 28 E $4.53 View
LTC3858EUFD-1#PBF QFN 28 E $6.56 $4.59 View
LTC3858EUFD-1#TRPBF QFN 28 E $4.65 View
LTC3858EUH#PBF QFN 32 E $6.56 $4.59 View
LTC3858EUH#TRPBF QFN 32 E $4.65 View
LTC3858EUH-2#PBF QFN 32 E $6.56 $4.59 View
LTC3858EUH-2#TRPBF QFN 32 E $4.65 View
LTC3858IGN-1#PBF SSOP 28 I $6.80 $4.76 View
LTC3858IGN-1#TRPBF SSOP 28 I $4.82 View
LTC3858IUFD-1#PBF QFN 28 I $6.89 $4.82 View
LTC3858IUFD-1#TRPBF QFN 28 I $4.88 View
LTC3858IUH#PBF QFN 32 I $6.97 $4.82 View
LTC3858IUH#TRPBF QFN 32 I $4.88 View
LTC3858IUH-2#PBF QFN 32 I $6.97 $4.82 View
LTC3858IUH-2#TRPBF QFN 32 I $4.88 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
DC1352A-B LTC3858EGN-1 Demo Board | Low IQ, Dual, 2-Phase Synchronous Step-Down Controller $175.00
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Click here to view our complete list of demo boards

Applications

  • Automotive Systems
  • Battery Operated Digital Devices
  • Distributed DC Power Systems

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Related models available in LTspice IV
LTC3858-1
LTC3858-2
LTC3858

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