LM2840XMK-ADJL/NOPB集成电路（IC）的稳压器-DC-DC开关稳压器规格书PDF中文资料

LM2840XMK-ADJL/NOPB属于集成电路（IC）的稳压器-DC-DC开关稳压器。由美国德州仪器公司制造生产的LM2840XMK-ADJL/NOPB稳压器 - DC-DC 开关稳压器DC-DC 开关稳压器 PMIC（电源管理集成电路）产品族中的产品是元器件级设备，用于需要稳定 DC 输入电压和/或将其转换为不同幅度的输出电压的应用。这些器件与称为“控制器”PMIC 的类似产品的区别在于集成了主开关元件，设备提供的电力会通过该元件。

1 Features

1• Input voltage 4.5 V to 42 V

• Output current options of 100 mA, 300 mA, and

600 mA

• Feedback pin voltage of 0.765 V

• 550-kHz (X) or 1.25-MHz (Y) switching frequency

• Low shutdown IQ: 16-μA typical

• Short-circuit protected

• Internally compensated

• Soft-start circuitry

• Small overall solution size (SOT-6L package)

• Create a custom design using the LM2840 (or

LM2841/42) with the WEBENCH® Power Designer

2 Applications

• Battery-powered equipment

• Industrial distributed power applications

• Portable media players

• Portable hand-held instruments

3 Description

The LM284x SIMPLE SWITCHER™ devices are

PWM DC/DC buck (step-down) regulators. With an

input range from 4.5 V to 42 V, they are suitable for a

wide range of applications, such as power

conditioning from unregulated sources. They feature

a low RDSON (0.9‑Ω typical) internal switch for

maximum efficiency (85% typical). Operating

frequency is fixed at 550 kHz (X option) and

1.25 MHz (Y option), allowing the use of small

external components while still being able to have low

output voltage ripple. Soft start can be implemented

using the shutdown (SHDN) pin with an external RC

circuit allowing the user to tailor the soft-start time to

a specific application.

The LM2840 is optimized for up to 100 mA, the

LM2841 for up to 300 mA, and the LM2842 for up to

600‑mA load currents. They all have a 0.765-V

nominal feedback voltage.

Additional features include: thermal shutdown, VIN

undervoltage lockout, and gate-drive undervoltage

lockout. The LM284x are available in a low-profile

SOT-6L package.