The LM2651 switching regulator provides high-efficiency power conversion over a 100:1 load range (1.5 A to 15 mA). This feature makes the LM2651 an ideal fit in battery-powered applications that demand long battery life in both run and standby modes.

Synchronous rectification is used to achieve up to 97% efficiency. At light loads, the LM2651 enters a low power hysteretic or sleep mode to maintain high efficiency. In many applications, the efficiency still exceeds 80% at 15-mA load. A shutdown pin is available to disable the LM2651 and reduce the supply current to less than 10 µA.

The LM2651 contains a patented current sensing circuitry for current mode control. This feature eliminates the external current sensing resistor required by other current-mode DC-DC converters.

The LM2651 has a 300-kHz fixed frequency internal oscillator. The high oscillator frequency allows the use of extremely small, low-profile components.

A programmable soft-start feature limits current surges from the input power supply at start-up and provides a simple means of sequencing multiple power supplies.

Other protection features include input undervoltage lockout, current limiting, and thermal shutdown.

• Ultrahigh Efficiency up to 97%
• High-Efficiency Over a 1.5-A to 1.5-mA Load Range
• 4-V to 14-V Input Voltage Range
• 1.8-V, 2.5-V, 3.3-V, or ADJ Output Voltage
• Internal MOSFET Switch With Low RDS(on) of 75 mΩ
• 300-kHz Fixed Frequency Internal Oscillator
• 7-A Shutdown Current
• Patented Current Sensing for Current Mode Control
• Input Undervoltage Lockout
• Adjustable Soft-Start
• Current Limit and Thermal Shutdown
• 16-Pin TSSOP Package

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• Vin (Min) (V)
• 4
• Vin (Max) (V)
• 14
• Vout (Min) (V)
• 3.3
• Vout (Max) (V)
• 13
• Iout (Max) (A)
• 1.5
• Iq (Typ) (uA)
• 1600
• Switching frequency (Min) (kHz)
• 255
• Switching frequency (Max) (kHz)
• 345
• Features
• UVLO Adjustable
• Rating
• Catalog
• Regulated outputs (#)
• 1
• Control mode
• Voltage Mode
• Duty cycle (Max) (%)
• 95

LM2651的完整型号有：LM2651MTC-3.3/NOPB、LM2651MTC-ADJ/NOPB、LM2651MTCX-3.3/NOPB、LM2651MTCX-ADJ/NOPB、LM2651MTC-ADJ，以下是这些产品的关键参数及官网采购报价：

LM2651MTC-3.3/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-16，包装数量MPQ：92个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM2651MTC-3.3/NOPB的批量USD价格：1.695（1000+）

LM2651MTC-ADJ/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-16，包装数量MPQ：92个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM2651MTC-ADJ/NOPB的批量USD价格：1.695（1000+）

LM2651MTCX-3.3/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM2651MTCX-3.3/NOPB的批量USD价格：1.424（1000+）

LM2651MTCX-ADJ/NOPB，工作温度：-40 to 125，封装：TSSOP (PW)-16，包装数量MPQ：2500个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SN，TI官网LM2651MTCX-ADJ/NOPB的批量USD价格：1.424（1000+）

LM2651MTC-ADJ，工作温度：-40 to 125，封装：TSSOP (PW)-16，包装数量MPQ：92个，MSL 等级/回流焊峰值温度：Level-1-260C-UNLIM，引脚镀层/焊球材料：SNPB，TI官网LM2651MTC-ADJ的批量USD价格：2.305（1000+）

LM2651-3.3EVAL 1.5A 高效开关稳压器

1.5A High Efficiency Switching Regulator

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