LTC3868
Info: : PRODUCTION
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LTC3868

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

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Info: : PRODUCTION tooltip
Info: : PRODUCTION tooltip
Part Details
Part Models 4
1ku List Price Starting From $3.26
Features
  • Low Operating IQ: 170μA (One Channel On)
  • Wide Output Voltage Range: 0.8V ≤ VOUT ≤ 14V
  • Wide VIN Range: 4V to 24V
  • 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 to 850kHz)
  • Programmable Fixed Frequency (50kHz to 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 Latchoff Protection During Short Circuit
  • Low Shutdown IQ: 8μA
  • Internal LDO Powers Gate Drive from VIN or EXTVCC
  • No Current Foldback During Start-Up
  • Small 5mm × 5mm QFN Package
Additional Details
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The LTC3868 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 LTC3868 features a precision 0.8V reference and a power good output indicator. A wide 4V to 24V 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. Current foldback limits MOSFET heat dissipation during short-circuit conditions. The output short-circuit latchoff feature further protects the circuit in short-circuit conditions.

For a leaded 28-lead SSOP package with a fixed current limit and one PGOOD output, without phase modulation or a clock output, see the LTC3868-1 data sheet.


LTC3868 LTC3868-1
Features Adjustable Current Limit, Clock Out Pin, Phase Modulation, Two PGOOD Fixed Current Limit, One PGOOD
Package QFN-32 SSOP-28

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery Operated Digital Devices
  • Distributed DC Power Systems
Part Models 4
1ku List Price Starting From $3.26

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3868EUH#PBF

PRODUCTION

LTC3868EUH#TRPBF

PRODUCTION

LTC3868IUH#PBF

PRODUCTION

LTC3868IUH#TRPBF

PRODUCTION

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)

LTC3868EUH#PBF

PRODUCTION

LTC3868EUH#TRPBF

PRODUCTION

LTC3868IUH#PBF

PRODUCTION

LTC3868IUH#TRPBF

PRODUCTION

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Jan 20, 2022

- 21_0269

arrow down

Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3868EUH#PBF

PRODUCTION

LTC3868EUH#TRPBF

PRODUCTION

LTC3868IUH#PBF

PRODUCTION

LTC3868IUH#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)

LTC3868EUH#PBF

PRODUCTION

LTC3868EUH#TRPBF

PRODUCTION

LTC3868IUH#PBF

PRODUCTION

LTC3868IUH#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

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.

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