The LM2738 regulator is a monolithic, high-frequency, PWM step-down DC-DC converter in an 8-pin WSON or 8-pin MSOP-PowerPAD package. It provides all the active functions for local DC-DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.

With a minimum of external components, the LM2738 is easy to use. The ability to drive 1.5-A loads with an internal 250-m? NMOS switch using state-of-the-art 0.5-μm BiCMOS technology results in the best power density available. Switching frequency is internally set to 550 kHz (LM2738Y) or 1.6 MHz (LM2738X), allowing the use of extremely small surface-mount inductors and chip capacitors. Even though the operating frequencies are very high, efficiencies up to 90% are easy to achieve. External enable is included, featuring an ultralow standby current of 400 nA. The LM2738 utilizes current-mode control and internal compensation to provide high-performance regulation over a wide range of operating conditions. Additional features include internal soft-start circuitry to reduce in-rush current, cycle-by-cycle current limit, thermal shutdown, and output over-voltage protection.

• Space-Saving WSON and MSOP-PowerPAD Packages
• 3-V to 20-V Input Voltage Range
• 0.8-V to 18-V Output Voltage Range
• 1.5-A Output Current
• 550-kHz (LM2738Y) and 1.6-MHz (LM2738X) Switching Frequencies
• 250-m? NMOS Switch
• 400-nA Shutdown Current
• 0.8-V, 2% Internal Voltage Reference
• Internal Soft-Start
• Current-Mode, PWM Operation
• Thermal Shutdown

• Vin (Min) (V)
• 3
• Vin (Max) (V)
• 20
• Vout (Min) (V)
• 0.8
• Vout (Max) (V)
• 18
• Iout (Max) (A)
• 1.5
• Iq (Typ) (uA)
• 1900
• Switching frequency (Min) (kHz)
• 550
• Switching frequency (Max) (kHz)
• 1600
• Features
• Enable, Light Load Efficiency
• Rating
• Catalog
• Regulated outputs (#)
• 1
• Control mode
• Current Mode
• Duty cycle (Max) (%)
• 95

LM2738的完整型号有：LM2738XMY/NOPB、LM2738XSD/NOPB、LM2738YMY/NOPB、LM2738YSD/NOPB，以下是这些产品的关键参数及官网采购报价：

LM2738XMY/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGN)-8，包装数量MPQ：1000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LM2738XMY/NOPB的批量USD价格：1.162（1000+）

LM2738XSD/NOPB，工作温度：-40 to 125，封装：WSON (NGQ)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM2738XSD/NOPB的批量USD价格：1.162（1000+）

LM2738YMY/NOPB，工作温度：-40 to 125，封装：HVSSOP (DGN)-8，包装数量MPQ：1000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LM2738YMY/NOPB的批量USD价格：1.162（1000+）

LM2738YSD/NOPB，工作温度：-40 to 125，封装：WSON (NGQ)-8，包装数量MPQ：1000个，MSL 等级/回流焊峰值温度：Level-3-260C-168 HR，引脚镀层/焊球材料：SN，TI官网LM2738YSD/NOPB的批量USD价格：1.162（1000+）

LM2738YSDEVAL — 采用节省空间的 LLP 封装的 LM2738 550kHz 1.5A 降压 DC-DC 开关稳压器 EVM

The LM2738 demo board is configured to convert 12V input to 3.3V output at 1.5A load current using the LM2738X 1.6MHz or the LM2738Y 550kHz step down DC-DC regulator. The tiny low profile eMSOP-8 and LLP-8 packages allows the demo board to be manufactured using just over one square inch of a (...)

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