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LM5121

AKTIV

Synchroner Aufwärtsregler im Strommodus, breiter Eingangsspannungsbereich, 3-65 V, mit Trennschalter

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Datenblatt

LM5121

AKTIV
Datenblatt Jetzt bestellen

Produktdetails

Rating Catalog Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 65 Vin (min) (V) 3 Vout (max) (V) 100 Vout (min) (V) 3 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Synchronous rectification, UVLO adjustable Duty cycle (max) (%) 100 Iq (typ) (A) 0.004 Operating temperature range (°C) -40 to 125
Rating Catalog Topology Boost, Flyback, Forward, SEPIC Vin (max) (V) 65 Vin (min) (V) 3 Vout (max) (V) 100 Vout (min) (V) 3 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Light-load efficiency, Synchronous rectification, UVLO adjustable Duty cycle (max) (%) 100 Iq (typ) (A) 0.004 Operating temperature range (°C) -40 to 125
HTSSOP (PWP) 20 41.6 mm² (6.5 mm × 6.4 mm)
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to +125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Maximum Input Voltage: 65 V
  • Min Input Voltage: 3.0 V (4.5 V for startup)
  • Output Voltage Up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1.0% Accuracy
  • Free-Run/Synchronizable up to 1 MHz
  • Peak Current Mode Control
  • Robust Integrated 3-A Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Programmable Line UVLO
  • Programmable Soft-Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip Cycle Mode Reduces
    Standby Power
  • Supports External VCC Bias Supply Option
  • Load Disconnection in Shutdown Mode (True
    Shutdown)
  • Inrush Current Limiting
  • Hiccup Mode Short Circuit/Overload Protection
  • Circuit Breaker Function
  • Capable of Input Transient Suppression
  • Capable of Reverse Battery Protection
  • Thermally Enhanced 20-Pin HTSSOP
  • AEC-Q100 Qualified with the following results:
    • Device Temperature Grade 1: –40°C to +125°C
      Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C6
  • Maximum Input Voltage: 65 V
  • Min Input Voltage: 3.0 V (4.5 V for startup)
  • Output Voltage Up to 100 V
  • Bypass (VOUT = VIN) Operation
  • 1.2-V Reference with ±1.0% Accuracy
  • Free-Run/Synchronizable up to 1 MHz
  • Peak Current Mode Control
  • Robust Integrated 3-A Gate Drivers
  • Adaptive Dead-Time Control
  • Optional Diode Emulation Mode
  • Programmable Cycle-by-Cycle Current Limit
  • Programmable Line UVLO
  • Programmable Soft-Start
  • Thermal Shutdown Protection
  • Low Shutdown Quiescent Current: 9 µA
  • Programmable Slope Compensation
  • Programmable Skip Cycle Mode Reduces
    Standby Power
  • Supports External VCC Bias Supply Option
  • Load Disconnection in Shutdown Mode (True
    Shutdown)
  • Inrush Current Limiting
  • Hiccup Mode Short Circuit/Overload Protection
  • Circuit Breaker Function
  • Capable of Input Transient Suppression
  • Capable of Reverse Battery Protection
  • Thermally Enhanced 20-Pin HTSSOP

The LM5121 is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.

The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.

The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.

An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.

The LM5121 is a synchronous boost controller intended for high-efficiency, high-power boost regulator applications. The control method is based upon peak current mode control. Current mode control provides inherent line feed-forward, cycle-by-cycle current limiting and ease of loop compensation.

The switching frequency is programmable up to 1 MHz. Higher efficiency is achieved using two robust N-channel MOSFET gate drivers with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions.

The LM5121 provides disconnection switch control which completely disconnects the output from the input during an output short or a shutdown condition. During start-up sequence, inrush current is limited by the disconnection switch control.

An internal charge pump allows 100% duty cycle operation of the high-side synchronous switch (Bypass operation). Additional features include thermal shutdown, frequency synchronization, hiccup mode current limit and adjustable line undervoltage lockout.
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Technische Dokumentation

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Top-Dokumentation Typ Titel Format-Optionen Neueste englische Version herunterladen Datum
* Datenblatt LM5121/-Q1 Wide Input Synchronous Boost Controller with Disconnection Switch Control datasheet (Rev. C) PDF | HTML 14.06.2016
Analog Design Journal Designing the front-end DC/DC conversion stage to withstand automotive transient 18.01.2017
Anwendungshinweis Designing Fault Protection Circuits Using Wide VIN LM5121 12.01.2015
Whitepaper How to design boost, SEPIC or flyback regulators with wide VIN power ICs 29.07.2014
Anwendungshinweis Practical Feedback Loop Analysis for Current-Mode Boost Converter 07.03.2014
Anwendungshinweis Automated Frequency Response Analyzer 09.10.2013

Design und Entwicklung

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Evaluierungsplatine

LM5121EVM — Synchron-Aufwärtsregler mit großem Vin und Trennschalter – Evaluierungsmodul

The LM5121EVM evaluation module (EVM) provides the design engineer with a fully functional synchronous boost converter to evaluate the Texas Instruments LM5121 synchronous boost controller IC including disconnection switch control. The EVM provides 12V output at up to 2A current from a 3.0V (5.7V (...)
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Simulationsmodell

LM5121 PSpice Transient Model (Rev. A)

SNVM505A.ZIP (115 KB) - PSpice-Modell
Unterstützte Produkte und Hardware
Simulationsmodell

LM5121 TINA-TI Transient Reference Design

SNVMA48.TSC (192 KB) - TINA-TI-Referenzdesign
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Simulationsmodell

LM5121 TINA-TI Transient Spice Model (Rev. A)

SNVMA47A.ZIP (53 KB) - TINA-TI Spice-Modell
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Simulationsmodell

LM5121 Unencrypted PSpice Transient Model

SNVM962.ZIP (7 KB) - PSpice-Modell
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Referenzdesign

PMP11422 — Kompakter batteriebetriebener Synchron-Aufwärtswandler (72 W) – Referenzdesign

PMP11422 is a synchronous boost power supply using the LM5121 controllers. The design accepts an input voltage of 5Vin to 8.6Vin, and boosts a 12Vout rail capable of sourcing 6A continuous current. The LM5121 integrates an input disconnection switch feature which allows boost short circuit (...)

Unterstützte Produkte und Hardware
Referenzdesign

PMP8673 — 150 W, Aufwärtswandler mit LM5121 – Referenzdesign

The PMP8673 reference design is a synchronous boost converter optimized for high efficiency while maintaining a small form factor. This reference design has a voltage input range of 34.5-37.5V (35V nominal) and provides an output voltage of 55.5V. The synchronous boost topology enables efficiencies (...)

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Referenzdesign

PMP9297 — 150-W-Zweikanal-Synchron-Aufwärtsregler für GaN-Audioanwendungen

PMP9297 is a dual channel synchronous boost for GaN audio amplifier applications. It converts 35V input to an adjustable 38V to 55V output at 150W per channel. The solution size fits in a 45mm x 34 mm board area. Additional input and output bulk capacitors are included outside of the solution size (...)
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Gehäuse Pins CAD-Symbole, Footprints und 3D-Modelle
HTSSOP (PWP) 20 Ultra Librarian
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