LM3668
- 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
- 1-A Maximum Load Current for
- 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
- 1-A Maximum Load Current for
- 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.
技術文件
| 重要文件 | 類型 | 標題 | 格式選項 | 下載最新的英文版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 資料表 | LM3668 1-A, High-Efficiency Dual-Mode Single-Inductor Buck-Boost DC-DC Converter datasheet (Rev. O) | PDF | HTML | 2015/4/23 | ||
| 應用說明 | Layer Design for Reducing Radiated EMI of DC to DC Buck-Boost Converters (Rev. A) | PDF | HTML | 2021/6/9 | |||
| 選擇指南 | Power Management Guide 2018 (Rev. R) | 2018/6/25 |
設計與開發
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LM3668 4.5/5V Unencrytped PSpice Transient Model Package (Rev. A)
| 封裝 | 針腳 | CAD 符號、佔位空間與 3D 模型 |
|---|---|---|
| WSON (DQB) | 12 | Ultra Librarian |