Inicio Gestión de la energía Convertidores de CA/CC y CC/CC (FET integrado)
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Gestión de la energía
Convertidores de CA/CC y CC/CC (FET integrado)

LM3668

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

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LM3668

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Detalles del producto

Rating Catalog Operating temperature range (°C) -40 to 85 Topology Buck-Boost Type Converter Vin (min) (V) 2.5 Vin (max) (V) 5.5 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 Iq (typ) (µA) 45 Switch current limit (typ) (A) 2.05
Rating Catalog Operating temperature range (°C) -40 to 85 Topology Buck-Boost Type Converter Vin (min) (V) 2.5 Vin (max) (V) 5.5 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 Iq (typ) (µA) 45 Switch current limit (typ) (A) 2.05
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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* Data sheet LM3668 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter datasheet (Rev. O) PDF | HTML 23 abr 2015

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

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