Inicio Gestión de la energía AC/DC & DC/DC converters (integrated FET)

Convertidor CC/CC elevador reductor con inductor único de modo doble y alta eficiencia de 1 A

LM3668 no se recomienda para nuevos diseños
Aunque esta producto sigue en producción para dar soporte a diseños anteriores, no lo recomendamos para nuevos diseños. Considere una de estas alternativas:
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Funcionalidad similar a la del dispositivo comparado
TPS631000 ACTIVO Convertidor reductor de alta densidad de alta potencia y corriente de salida de 1.5-A Replacement
TPS63802 ACTIVO Convertidor elevador/reductor de corriente quiescente de 11 µA, alta eficiencia y 2 A en encapsulado The TPS63802 offers a smaller solution size, higher output current, a wider operating range and higher efficiency.

Detalles del producto

Vin (min) (V) 2.5 Vin (max) (V) 5.5 Topology Buck-Boost Type Converter Switching frequency (min) (kHz) 1900 Switching frequency (max) (kHz) 2500 Features Frequency synchronization, Light Load Efficiency Vout (min) (V) 2.8 Vout (max) (V) 5 Rating Catalog Operating temperature range (°C) -40 to 85 Iq (typ) (A) 0.000045
Vin (min) (V) 2.5 Vin (max) (V) 5.5 Topology Buck-Boost Type Converter Switching frequency (min) (kHz) 1900 Switching frequency (max) (kHz) 2500 Features Frequency synchronization, Light Load Efficiency Vout (min) (V) 2.8 Vout (max) (V) 5 Rating Catalog Operating temperature range (°C) -40 to 85 Iq (typ) (A) 0.000045
WSON (DQB) 12 9 mm² 3 x 3
  • 45-µA Typical Quiescent Current
  • For 2.8-V-3.3-V and 3-V-3.4-V Versions:
    • 1-A Maximum Load Current for
      VIN = 2.8 V to 5.5 V
    • 800-mA Maximum Load Current for
      VIN = 2.7 V
    • 600-mA Maximum Load Current for
      VIN = 2.5 V
  • For 4.5 V-5 V
    • 1-A Maximum Load Current for
      VIN = 3.9 V to 5.5 V
    • 800-mA Maximum Load Current for
      VIN = 3.4 V to 3.8 V
    • 700-mA Maximum Load Current for
      VIN = 3 V to 3.3 V
    • 600-mA Maximum Load Current for
      VIN = 2.7 V to 2.9 V
  • 2.2-MHz PWM Fixed Switching Frequency
    (Typical)
  • Automatic PFM-PWM Mode or Forced PWM
    Mode
  • Wide Input Voltage Range: 2.5 V to 5.5 V
  • Internal Synchronous Rectification for High
    Efficiency
  • Internal Soft Start: 600-µs Maximum Start-Up
    Time After VIN Settled
  • 0.01-µA Typical Shutdown Current
  • Current Overload and Thermal Shutdown
    Protection
  • Frequency Sync Pin: 1.6 MHz to 2.7 MHz
  • 45-µA Typical Quiescent Current
  • For 2.8-V-3.3-V and 3-V-3.4-V Versions:
    • 1-A Maximum Load Current for
      VIN = 2.8 V to 5.5 V
    • 800-mA Maximum Load Current for
      VIN = 2.7 V
    • 600-mA Maximum Load Current for
      VIN = 2.5 V
  • For 4.5 V-5 V
    • 1-A Maximum Load Current for
      VIN = 3.9 V to 5.5 V
    • 800-mA Maximum Load Current for
      VIN = 3.4 V to 3.8 V
    • 700-mA Maximum Load Current for
      VIN = 3 V to 3.3 V
    • 600-mA Maximum Load Current for
      VIN = 2.7 V to 2.9 V
  • 2.2-MHz PWM Fixed Switching Frequency
    (Typical)
  • Automatic PFM-PWM Mode or Forced PWM
    Mode
  • Wide Input Voltage Range: 2.5 V to 5.5 V
  • Internal Synchronous Rectification for High
    Efficiency
  • Internal Soft Start: 600-µs Maximum Start-Up
    Time After VIN Settled
  • 0.01-µA Typical Shutdown Current
  • Current Overload and Thermal Shutdown
    Protection
  • Frequency Sync Pin: 1.6 MHz to 2.7 MHz

The LM3668 is a synchronous buck-boost DC-DC converter optimized for powering low voltage circuits from a Li-Ion battery and input voltage rails between 2.5 V and 5.5 V. It has the capability to support up to 1-A output current over the output voltage range. The LM3668 regulates the output voltage over the complete input voltage range by automatically switching between buck or boost modes depending on the input voltage.

The LM3668 has 2 N-channel MOSFETS and 2 P-channel MOSFETS arranged in a topology that provides continuous operation through the buck and boost operating modes. There is a MODE pin that allows the user to choose between an intelligent automatic PFM-PWM mode operation and forced PWM operation. During PWM mode, a fixed-frequency 2.2 MHz (typical) is used. PWM mode drives load up to 1 A. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 45 µA (typical) at light loads during system standby. Internal synchronous rectification provides high efficiency. In shutdown mode (EN pin pulled low), the device turns off and reduces battery consumption to 0.01 µA (typical).

A high switching frequency of 2.2 MHz (typical) allows the use of tiny surface-mount components including a 2.2-µH inductor, a 10-µF input capacitor, and a 22-µF output capacitor.

The LM3668 is a synchronous buck-boost DC-DC converter optimized for powering low voltage circuits from a Li-Ion battery and input voltage rails between 2.5 V and 5.5 V. It has the capability to support up to 1-A output current over the output voltage range. The LM3668 regulates the output voltage over the complete input voltage range by automatically switching between buck or boost modes depending on the input voltage.

The LM3668 has 2 N-channel MOSFETS and 2 P-channel MOSFETS arranged in a topology that provides continuous operation through the buck and boost operating modes. There is a MODE pin that allows the user to choose between an intelligent automatic PFM-PWM mode operation and forced PWM operation. During PWM mode, a fixed-frequency 2.2 MHz (typical) is used. PWM mode drives load up to 1 A. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 45 µA (typical) at light loads during system standby. Internal synchronous rectification provides high efficiency. In shutdown mode (EN pin pulled low), the device turns off and reduces battery consumption to 0.01 µA (typical).

A high switching frequency of 2.2 MHz (typical) allows the use of tiny surface-mount components including a 2.2-µH inductor, a 10-µF input capacitor, and a 22-µF output capacitor.

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Documentación técnica

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Tipo Título Fecha
* Data sheet LM3668 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter datasheet (Rev. O) PDF | HTML 23 abr 2015
Application note Layer Design for Reducing Radiated EMI of DC to DC Buck-Boost Converters (Rev. A) PDF | HTML 09 jun 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 jun 2018
EVM User's guide AN-1623 LM3668 Evaluation Board (Rev. F) 30 abr 2013

Diseño y desarrollo

Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.

Modelo de simulación

LM3668 4.5/5V Unencrytped PSpice Transient Model Package (Rev. A)

SNVM995A.ZIP (45 KB) - PSpice Model
Paquete Pasadores Descargar
WSON (DQB) 12 Ver opciones

Pedidos y calidad

Información incluida:
  • RoHS
  • REACH
  • Marcado del dispositivo
  • Acabado de plomo/material de la bola
  • Clasificación de nivel de sensibilidad a la humedad (MSL) / reflujo máximo
  • Estimaciones de tiempo medio entre fallas (MTBF)/fallas en el tiempo (FIT)
  • Contenido del material
  • Resumen de calificaciones
  • Monitoreo continuo de confiabilidad
Información incluida:
  • Lugar de fabricación
  • Lugar de ensamblaje

Soporte y capacitación

Foros de TI E2E™ con asistencia técnica de los ingenieros de TI

El contenido lo proporcionan “tal como está” TI y los colaboradores de la comunidad y no constituye especificaciones de TI. Consulte los términos de uso.

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