LM3281 - LM3281 3.3V、1.2A、6 MHz 迷你型降压 DC-DC 转换器

LM3281是TI德州仪器公司的一款转换器（集成开关）产品，LM3281是LM3281 3.3V、1.2A、6 MHz 迷你型降压 DC-DC 转换器，本站介绍了LM3281的封装应用图解、特点和优点、功能等，并给出了与LM3281相关的TI元器件型号供参考。

LM3281 - LM3281 3.3V、1.2A、6 MHz 迷你型降压 DC-DC 转换器 - 转换器（集成开关） - DC/DC开关稳压器 - 德州仪器

产品特性

Operates from a Single Li-Ion Cell (3 V to 5.5 V)
6-MHz (typ.) PWM Switching Frequency
Fixed Output Voltage: 3.3 V
Up to 1.2-A Maximum Load Capability
High Efficiency: 94% (typ.) with 3.8-V VIN at 300mA
Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA
Low IQ: 16 µA typical, 25 µA maximum
Automatic ECO/PWM/Bypass Mode Change
Forced PWM Mode for Low Output-Voltage Ripple
Soft-Start Limits Input Current on Start-Up
Current Overload Protection
Thermal Overload Protection
Small Total Solution Size: < 7.5 mm2

产品应用

WLAN, WiFi Station Devices
WiFi RF PC Cards
Battery-Powered RF Devices

产品说明

The LM3281 is a high-efficiency low-noise miniature DC-DC converter optimized for powering noise-sensitive wireless connectivity chipsets and RF Front End Modules (FEMs) from a single Lithium-Ion cell. The LM3281 is ideal for “always on” applications with very low unloaded quiescent current of 16 µA (typ.).

The LM3281 steps down an input supply voltage to a fixed output voltage of 3.3 V with output current up to 1200 mA. Five different modes of operation are used to optimize efficiency and minimize battery drain. In Pulse Width Modulation (PWM) mode, the device operates at a fixed frequency of 6 MHz which minimizes RF interference when driving medium-to-heavy loads. At light load, the device automatically enters into Economy (ECO) mode with reduced quiescent current. In a low-battery voltage condition, a bypass mode reduces the voltage dropout to 60 mV (typ.) at 600 mA. If very low output voltage ripple is desired at light loads, the device can also be forced into PWM mode. Shutdown mode turns the device off and reduces battery consumption to 0.1 μA (typ.).

产品器件信息

PART NUMBER	PACKAGE	BODY SIZE
LM3281	DSBGA (6)	1.465 mm x 1.190 (MAX)

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