The LM3673 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 350-mA load current over the entire input voltage range. There are several different fixed voltage output options available, as well as an adjustable output voltage version ranging from 1.1 V to 3.3 V.

The device offers superior features and performance for mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between pulse width modulation (PWM) and pulse frequency modulation (PFM) for better efficiency. During PWM mode, the device operates at a fixed-frequency of
2 MHz (typical). Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typical) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3673 is available in a tiny 5-pin DSBGA package. A high switching frequency of 2 MHz (typical) allows the use of three tiny surface-mount components: an inductor and two ceramic capacitors.

For all available packages, see the orderable addendum at the end of the data sheet.

• 16-μA Typical Quiescent Current
• 350-mA Maximum Load Capability
• 2-MHz PWM Fixed Switching Frequency (Typical)
• Automatic PFM/PWM Mode Switching
• Available in Fixed and Adjustable Output Voltages
• Internal Synchronous Rectification for High Efficiency
• Internal Soft Start
• 0.01-μA Typical Shutdown Current
• Operates From a Single Li-Ion Cell Battery
• Current Overload and Thermal Shutdown Protection
• Only Three Tiny Surface-Mount External Components Required (One Inductor, Two Ceramic Capacitors)

• Vin (Min) (V)
• 2.7
• Vin (Max) (V)
• 5.5
• Vout (Min) (V)
• 1.1
• Vout (Max) (V)
• 3.3
• Iout (Max) (A)
• 0.35
• Iq (Typ) (uA)
• 16
• Switching frequency (Min) (kHz)
• 1600
• Switching frequency (Max) (kHz)
• 2600
• Features
• Enable, Light Load Efficiency, Synchronous Rectification
• Rating
• Catalog
• Regulated outputs (#)
• 1
• Control mode
• Voltage Mode
• Duty cycle (Max) (%)
• 100

LM3673的完整型号有：LM3673TL-1.2/NOPB、LM3673TL-1.5/NOPB、LM3673TL-1.8/NOPB、LM3673TL-ADJ/NOPB、LM3673TLX-1.2/NOPB、LM3673TLX-1.8/NOPB、LM3673TLX-ADJ/NOPB，以下是这些产品的关键参数及官网采购报价：

LM3673TL-1.2/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TL-1.2/NOPB的批量USD价格：0.476（1000+）

LM3673TL-1.5/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TL-1.5/NOPB的批量USD价格：0.397（1000+）

LM3673TL-1.8/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TL-1.8/NOPB的批量USD价格：0.476（1000+）

LM3673TL-ADJ/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：250个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TL-ADJ/NOPB的批量USD价格：0.476（1000+）

LM3673TLX-1.2/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TLX-1.2/NOPB的批量USD价格：0.397（1000+）

LM3673TLX-1.8/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TLX-1.8/NOPB的批量USD价格：0.397（1000+）

LM3673TLX-ADJ/NOPB，工作温度：-30 to 85，封装：DSBGA (YZR)-5，包装数量MPQ：3000个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNAGCU，TI官网LM3673TLX-ADJ/NOPB的批量USD价格：0.397（1000+）

LM3673TL-ADJEV — 2MHz、350mA 降压 DC-DC 转换器评估模块

The LM3673 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. There are several different fixed voltage output options (...)

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