Datasheet > LM3281

LM3281

更新时间： 2024-11-13 11:15:07

品牌	Logo	应用领域
德州仪器 - TI		转换器
页数	文件大小	规格书
25页	685K
描述
3.3V、1.2A、6MHz 微型降压直流/直流转换器

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LM3281

SNVSA38 –NOVEMBER 2014

LM3281 3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter

for Wireless Connectivity Solutions

1 Features

3 Description

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.).

•

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 V_INat

300 mA

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.).

•

Analog Bypass: 60-mV (typ.) Drop-Out at 600 mA

Low I_Q: 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

2 Applications

•

WLAN, WiFi Station Devices

WiFi RF PC Cards

Device Information⁽¹⁾

Battery-Powered RF Devices

PART NUMBER

PACKAGE

BODY SIZE

LM3281

DSBGA (6)

1.465 mm x 1.190 (MAX)

(1) For all available packages, see the orderable addendum at

the end of the datasheet.

Simplified Schematic

3 V - 5.5 V

C_IN

2.2 µF

L_SW

0.47 µH

VIN

V_{IN_a}

V_{IN_b}

V_{IN_c}

MODE

OUT

C_LOAD2

4.7 µF

GPO2

GPO1

3.3 V

LM3281

C_OUT

C_LOAD1

10 µF

GND

2.2 µF

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

12 3 4 5 6 7...25

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与LM3281相关器件

型号	品牌	获取价格	描述	数据表
LM3281YFQR	TI	获取价格	3.3V、1.2A、6MHz 微型降压直流/直流转换器 \| YFQ \| 6 \| -30 t
LM329	Linear	获取价格	6.9V Precision Voltage Reference
LM329_08	NSC	获取价格	Precision Reference
LM3290	TI	获取价格	LM3290
LM3290TME/NOPB	TI	获取价格	LM3290 Product Brief
LM3290TMX/NOPB	TI	获取价格	LM3290 Product Brief
LM3291	TI	获取价格	LM3291 Product Brief
LM3291TMENOPB	TI	获取价格	LM3291 Product Brief
LM3291TMXNOPB	TI	获取价格	LM3291 Product Brief
LM329ACH	Linear	获取价格	1-OUTPUT TWO TERM VOLTAGE REFERENCE, 6.9 V, MBCY2

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