LM3668 - 1A、高效双模单电感器降压/升压 DC/DC 转换器

LM3668是TI德州仪器公司的一款转换器（集成开关）产品，LM3668是1A、高效双模单电感器降压/升压 DC/DC 转换器，本站介绍了LM3668的封装应用图解、特点和优点、功能等，并给出了与LM3668相关的TI元器件型号供参考。

LM3668 - 1A、高效双模单电感器降压/升压 DC/DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性

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

Typical Application Circuit

产品应用

Handset Peripherals
MP3 Players
Pre-Regulation for Linear Regulators
PDAs
Portable Hard Disk Drives
WiMax Modems

产品说明

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.

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE (NOM)
LM3668	WSON (12)	3.00 mm x 3.00 mm

下面可能是您感兴趣的TI德州仪器公司转换器（集成开关）元器件

TI公司产品现货专家，订购TI公司产品不限最低起订量，TI芯片大陆现货即时发货，香港库存3-5天发货，海外库存7-10天发货

寻找全球TI代理商现货货源 - TI公司（德州仪器）电子元件在线订购