The LM34919B Step-Down Switching Regulator features all of the functions needed to implement a low cost, efficient, buck bias regulator capable of supplying 0.6A to the load. This buck regulator contains an N-Channel Buck Switch, and is available in a 10-pin DSBGA package. The constant on-time feedback regulation scheme requires no loop compensation, results in fast load transient response, and simplifies circuit implementation. The operating frequency remains constant with line and load variations due to the inverse relationship between the input voltage and the on-time. The valley current limit results in a smooth transition from constant voltage to constant current mode when current limit is detected, reducing the frequency and output voltage, without the use of foldback. Additional features include: VCC under-voltage lockout, thermal shutdown, gate drive under-voltage lockout, and maximum duty cycle limiter.

• AEC-Q100 Grade 1 Qualified (–40°C to 125°C)
• Maximum Switching Frequency: 2.6 MHz (VIN=14V,Vo=3.3V)
• Input Voltage Range: 6V to 40V
• Integrated N-Channel Buck Switch
• Integrated Startup Regulator
• No loop compensation Required
• Ultra-Fast transient Response
• Operating frequency remains constant with Load Current and Input Voltage
• Maximum Duty Cycle Limited During Startup
• Adjustable Output Voltage
• Valley Current Limit At 0.64A
• Precision Internal Reference
• Low Bias Current
• Highly Efficient Operation
• Thermal Shutdown
• 10-Pin DSBGA Package

• Vin (Min) (V)
• 6
• Vin (Max) (V)
• 40
• Vout (Min) (V)
• 2.5
• Vout (Max) (V)
• 35
• Iout (Max) (A)
• 0.6
• Iq (Typ) (uA)
• 780
• Switching frequency (Min) (kHz)
• 50
• Switching frequency (Max) (kHz)
• 2600
• Features
• Enable, Over Current Protection
• Rating
• Automotive
• Regulated outputs (#)
• 1
• Control mode
• Constant on-time (COT)
• Duty cycle (Max) (%)
• 99

LM34919B-Q1的完整型号有：LM34919BQTL/NOPB、LM34919BQTLX/NOPB，以下是这些产品的关键参数及官网采购报价：

LM34919BQTL/NOPB，工作温度：-40 to 125，封装：DSBGA (YPA)-10，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LM34919BQTL/NOPB的批量USD价格：1.67（1000+）

LM34919BQTLX/NOPB，工作温度：-40 to 125，封装：DSBGA (YPA)-10，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LM34919BQTLX/NOPB的批量USD价格：1.428（1000+）

LM34919BEVAL — LM34919BEVAL 评估板

The LM34919BEVAL evaluation board provides the design engineer with a fully functional buck regulator, employing the constant on-time (COT) operating principle. This evaluation board provides a 3.3V output over an input range of 6V to 24V. The circuit delivers load currents to 600 mA, with current (...)

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