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Datasheet Linear Technology LTC2923

ManufacturerLinear Technology

Power Supply Tracking Controller


  • Download » Datasheet PDF, 1.0 Mb, Revision: B, File uploaded: Oct 25, 2017
    LTC2923 - Power Supply Tracking Controller
    Docket ↓
    Power Supply
    Tracking Controller
    Features Description Flexible Power Supply Tracking
    n Tracks Both Up and Dow Power Supply Sequencing
    n Supply Stability is Not Affected
    n Controls Two Supplies Without Series FETs
    n Controls a Third Supply With a Series FET
    n Adjustable Ramp Rates
    n Electronic Circuit Breaker
    n Available in 10-Lead MS and 12-Lead (4mm Г— 3mm) DFN Packages The LTCВ®2923 provides a simple solution to power supply
    tracking and sequencing requirements. By selecting a few
    resistors, the supplies can be configured to ramp-up and
    ramp-down together or with voltage offsets, time delays
    or different ramp rates. n By introducing currents into the feedback nodes of two
    independent switching regulators, the LTC2923 causes
    their outputs to track without inserting any pass element
    losses. Because the currents are controlled in an openloop manner, the LTC2923 does not affect the transient
    response or stability of the supplies. Furthermore, it
    presents a high impedance when power-up is complete,
    effectively removing it from the DC/DC circuit. Applications VCORE and VI/O Supply Tracking Microprocessor, DSP and FPGA Supplies
    n Servers
    n Communication Systems L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear ...




Circuit Breakers11111111
DC/DC Feedback Node Trackingyesyesyesyesyesyesyesyes
Demo BoardsDC732ADC732ADC732ADC732ADC732ADC732ADC732ADC732A
Design ToolsLTspice ModelLTspice ModelLTspice ModelLTspice ModelLTspice ModelLTspice ModelLTspice ModelLTspice Model
Export Controlnononononononono
Isupply, mA1.
Number of Supplies33333333
Operating Temperature Range, °C0 to 700 to 700 to 700 to 70-40 to 85-40 to 85-40 to 85-40 to 85
Power Good Outputnononononononono
Series FETs Trackingyesyesyesyesyesyesyesyes
Supply Voltage Range2.9V to 5.5V2.9V to 5.5V2.9V to 5.5V2.9V to 5.5V2.9V to 5.5V2.9V to 5.5V2.9V to 5.5V2.9V to 5.5V
Total Supplies33333333

Eco Plan

Design Notes

  • Download » Design Notes - DN372 PDF, 75 Kb, File published: Aug 10, 2005
    Power Supply Tracker Can Also Margin Supplies
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    advertisement Power Supply Tracker Can Also Margin Supplies – Design Note 372
    Dan Eddleman
    Power supply margining is a technique commonly used to
    test circuit boards in production. By adjusting power
    supply output voltages, electrical components are tested
    at the upper and lower supply voltage limits specified for
    a design. The LTCВ®2923 power supply tracking controller
    can be used to margin supplies in addition to its usual task
    of tracking multiple power supplies.
    The LTC2923 uses the simple tracking cell shown in
    Figure 1 to control the ramp-up and ramp-down behavior
    of multiple supplies. This cell servos the TRACK input to
    0.8V and mirrors the current supplied by that pin at the FB
    output pin. The FB pin connects to the feedback node of
    the slave power supply. Normally, a resistive divider
    connects the master signal to the TRACK pin. By selecting
    the appropriate resistor values, RTA and RTB, the relationship of the slave power supply is configured relative to the
    master signal.
    The supply margining application uses an LTC2923 tracking cell to margin a supply high and low under the control
    of a three-state I/O pin. illustration. If the feedback voltage, VFB, of the power
    supply is 0.8V, solve for the value of RFM1 that must be
    added in parallel with RF1 of the existing design to
    produce the desired high margin output. ...


  • Download » Articles - LT Journal PDF, 312 Kb, File published: Apr 1, 2010
    Dual 500mA µPower LDO Features Independent 1.8V-20V Inputs and Easy Sequencing in a 4mm × 3mm DFN
    Docket ↓
    design ideas Dual 500mA µPower LDO Features Independent 1.8V–20V
    Inputs and Easy Sequencing in a 4mm Г— 3mm DFN
    Molly Zhu The LT3029 integrates
    two independent 500mA
    monolithic LDOs in a
    tiny 16-lead MSOP or
    4mm Г— 3mm Г— 0.75mm DFN
    package. Both regulators
    have a wide 1.8V to 20V
    input voltage range with
    a 300mV dropout voltage
    at full load. The output
    voltage is adjustable down
    to the 1.215V reference
    voltage. With an external
    bypass capacitor, the
    output voltage noise is less
    than 20ВµVRMS. A complete
    power supply requires only
    a minimum 3.3ВµF ceramic
    output capacitor for each
    channel to be stable.
    Quiescent current is 55ВµA per channel, dropping below 1ВµA in shutdown. ...
  • Download » Articles - LT Journal PDF, 135 Kb, File published: Dec 1, 2003
    Low Voltage Wizardry Provides the Ultimate Power-On Reset Circuit
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    DESIGN FEATURES Low Voltage Wizardry Provides the
    Ultimate Power-On Reset Circuit
    by Bob Jurgilewicz The Low Voltage
    Reset Problem VRST
    VIN Figure 2. Traditional NMOS pull-down circuit 14 5V
    3.3V DC/DC
    1.8V SYSTEM
    LOGIC C1
    0.1ВµF LTC2903B-2
    GND V4 V2 V3 Figure 1. Typical application using the LTC2903B for quad supply monitoring inside the chip). Second, there is a
    limit to how small the external resistor
    can be before the resistor overcomes
    the pull-up strength of the PMOS
    transistor. Third, low power systems
    will suffer while the reset node is logic
    high, since the external resistor will
    continuously dissipate power. With
    a 5V output and a 100kО© external ...
  • Download » Articles - LT Journal PDF, 376 Kb, File published: Feb 1, 2004
    Versatile Power Supply Tracking without MOSFETs
    Docket ↓
    DESIGN FEATURES Versatile Power Supply Tracking
    by Dan Eddleman
    without MOSFETs
    Introduction Modern electronics systems often have
    complex power supply voltage tracking
    and sequencing requirements. Ignoring these requirements can result in
    the immediate destruction of devices,
    or worse yet, premature failures in the
    Voltage tracking requirements
    usually specify that the voltage difference between two power supplies
    must never exceed a certain limit. This
    constraint applies at all times: during
    power up, power down, and steady
    state operation. In contrast, supply sequencing requirements specify the order in which
    supplies power up and power down.
    Figure 1 shows various tracking
    and sequencing scenarios.
    The penalty for poor tracking or sequencing is often irreparable damage
    to devices in the system. FGPAs, PLDs,
    DSPs and microprocessors typically
    have diodes placed between the core
    and I/O supplies as a component of the ...
  • Download » Articles - LT Journal PDF, 267 Kb, File published: Mar 25, 2005
    Power Supply Tracking for Linear Regulators
    Docket ↓
    DESIGN FEATURES Power Supply Tracking for
    Linear Regulators
    Introduction (see “Versatile Power Supply Tracking
    without MOSFETs” from Linear Technology Magazine, February, 2004 ) but
    it is easily adapted to linear regulators,
    including popular low-dropout (LDO)
    types. Summarized here are several
    techniques for controlling linear regulators with the LTC2923. The LTC2923 provides simple and
    versatile control over the power-up
    and power-down behavior of switching
    power supplies. It allows several supplies to track the voltage of a master
    supply, so that their relative voltages
    meet the stringent specifications for
    the power up of modern digital
    semiconductors, such as DSPs, microprocessors, FPGAs and ASICs. The
    LTC2923 is specifically designed to
    work with switching power supplies Monolithic Regulators
    Table 1 lists three popular monolithic
    linear regulators that have been tested
    with the LTC2923. Using these three Table 1. New monolithic linear regulators Regulator IOUT(MAX) (V) VIN(MIN) (V) VIN(MAX) (V) VDROPOUT (V) LT3020 100mA 0.9 10 0.15 LTC1844 150mA 1.6 6.5 0.11 LTC3025 300mA 0.9 5.5 0.045 3.3V IN
    2.2ВµF 3.3V CGATE
    0.1ВµF 0.1ВµF

Moldel Line

Series: LTC2923 (8)

Manufacturer's Classification

  • Monitor, Control and Protection > Sequencers, Trackers, and Margining Controllers
  • Monitor, Control and Protection > Sequencers, Trackers, and Margining Controllers > Tracking Controllers

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