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Datasheet Linear Technology LT3742

ManufacturerLinear Technology

Dual, 2-Phase Step-Down Switching Controller


  • Download » Datasheet PDF, 319 Kb, File uploaded: Sep 19, 2017
    LT3742: Dual, 2-Phase Step-Down Switching Controller Data Sheet
    Docket ↓
    Dual, 2-Phase Step-Down
    Switching Controller
    Features n n n n n n n n Description Wide Input Voltage Range: 4V to 30V
    Wide Output Voltage Range: 0.8V to VIN
    Low Shutdown IQ: 20ВµA
    Out-of-Phase Controllers Reduce Required Input Capacitance and Power Supply Induced Noise
    0.8V В±1.5% Voltage Reference
    500kHz Current Mode Fixed Frequency Operation
    Internal Boost Converter Provides Bias Rail for
    N-channel MOSFET Gate Drive
    Power Good Voltage Monitor for Each Output
    Programmable Soft-Start
    24-Lead 4mm Г— 4mm Г— 0.75mm Package The LTВ®3742 is a dual step-down DC/DC switching regulator
    controller that drives high side N-channel power MOSFETs.
    A 500kHz fixed frequency current mode architecture provides fast transient response with simple loop compensation components and cycle-by-cycle current limiting. The
    output stages of the two controllers operate 180В° out of
    phase to reduce the input ripple current, minimizing the
    noise induced on the input supply, and allowing less input
    An internal boost regulator generates a bias rail of VIN + 7V
    to provide gate drive for the N-channel MOSFETs allowing
    low dropout and 100% duty cycle operation. The LT3742 ...



Package4x4 QFN-24
Package Outline Drawing
4x4 QFN-24
Package Outline Drawing
Package CodeUFUF
Package Index05-08-169705-08-1697
Pin Count2424


ArchitectureConstant Frequency Current ModeConstant Frequency Current Mode
Demo BoardsDC927ADC927A
Design ToolsLTspice File,LTpowerCAD ModelLTspice File,LTpowerCAD Model
Export Controlnono
FeaturesAnti-Phase Switching, Tracking, Power Good, 100% Duty CycleAnti-Phase Switching, Tracking, Power Good, 100% Duty Cycle
Frequency, kHz500500
Integrated Inductornono
Ishutdown, µA2020
Isupply, mA55
Max Phases22
Number of Outputs22
Operating Temperature Range, °C0 to 850 to 85
Output Current, A55
Output Current 2, A55
Sense ResistorRsenseRsense
Switch Current, A55
Switch Current 2, A55
Topology 1BuckBuck
Topology 2BuckBuck
Vin Max, V3030
Vin Min, V44
Vout Max, V3030
Vout MaximumVinVin
Vout Min, V0.80.8
Vout Min 2, V.8.8
Vref Accuracy Over Temp, %1.51.5

Eco Plan



  • Download » Articles - LT Journal PDF, 259 Kb, File published: Jan 14, 2008
    Wide Input Voltage Range, Dual Step-Down Controller Reduces Power Supply Size and Cost
    Docket ↓
    L DESIGN FEATURES Wide Input Voltage Range, Dual
    Step-Down Controller Reduces
    By Wei Gu
    Power Supply Size and Cost
    Introduction Internal Step-Up
    Bias Converter The LT3742 integrates a DC/DC
    step-up converter to generate the
    gate drive voltage for the N-channel
    MOSFETs. The gate drive voltage is
    regulated to (VIN + 7V), which permits
    the use of inexpensive off-the-shelf
    5V gate-drive N-channel MOSFETs,
    offering higher efficiency than sublogic-level gate-drive MOSFETs. The
    gate driver is capable of driving large,
    low RDS(ON), standard level, N-channel
    MOSFETS without the need for a gate
    drive buffer.
    Integrating the step-up converter
    also allows low dropout and 100% duty
    22 L3
    22ВµH VIN
    14V-28V VIN
    UVLO 1ВµF 4.7ВµF ...

Moldel Line

Series: LT3742 (2)

Manufacturer's Classification

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

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