LM3668

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1A、高效雙模單電感器降壓/升壓直流/直流轉換器

產品詳情

Rating Catalog Topology Buck-Boost Switch current limit (typ) (A) 2.05 Vin (max) (V) 5.5 Vin (min) (V) 2.5 Vout (max) (V) 5 Vout (min) (V) 2.8 Features Frequency synchronization, Light-load efficiency Switching frequency (min) (kHz) 1900 Switching frequency (max) (kHz) 2500 Operating temperature range (°C) -40 to 85 Iq (typ) (μA) 45 Type Converter
Rating Catalog Topology Buck-Boost Switch current limit (typ) (A) 2.05 Vin (max) (V) 5.5 Vin (min) (V) 2.5 Vout (max) (V) 5 Vout (min) (V) 2.8 Features Frequency synchronization, Light-load efficiency Switching frequency (min) (kHz) 1900 Switching frequency (max) (kHz) 2500 Operating temperature range (°C) -40 to 85 Iq (typ) (μA) 45 Type Converter
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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類型 標題 下載最新的英語版本 日期
* 數據表 LM3668 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter 數據表 (Rev. O) PDF | HTML 2015年 4月 23日
應用手冊 降低直流/直流降壓/升壓轉換器輻射 EMI 的層設計 (Rev. A) PDF | HTML 英語版 (Rev.A) PDF | HTML 2021年 7月 16日
選擇指南 電源管理指南 2018 (Rev. K) 2018年 7月 31日
選擇指南 電源管理指南 2018 (Rev. R) 2018年 6月 25日
EVM 用戶指南 AN-1623 LM3668 Evaluation Board (Rev. F) 2013年 4月 30日

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仿真模型

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

SNVM995A.ZIP (45 KB) - PSpice Model
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WSON (DQB) 12 Ultra Librarian

訂購和質量

包含信息：
  • RoHS
  • REACH
  • 器件標識
  • 引腳鍍層/焊球材料
  • MSL 等級/回流焊峰值溫度
  • MTBF/時基故障估算
  • 材料成分
  • 鑒定摘要
  • 持續(xù)可靠性監(jiān)測
包含信息：
  • 制造廠地點
  • 封裝廠地點

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