Datasheet > LT3581HDE#TRPBF

LT3581HDE#TRPBF

更新时间： 2024-02-20 18:58:44

品牌	Logo	应用领域
凌特 - Linear		开关光电二极管
页数	文件大小	规格书
36页	456K
描述
LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: DFN; Pins: 14; Temperature Range: -40°C to 125°C

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LT3581HDE#TRPBF 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	包装说明：	HVSON,
针数：	14	Reach Compliance Code：	compliant
风险等级：	5.6	模拟集成电路 - 其他类型：	SWITCHING REGULATOR
控制模式：	CURRENT-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	22 V	最小输入电压：	2.5 V
标称输入电压：	5 V	JESD-30 代码：	R-PDSO-N14
长度：	4 mm	功能数量：	1
端子数量：	14	最高工作温度：	150 °C
最低工作温度：	-40 °C	最大输出电流：	5.4 A
封装主体材料：	PLASTIC/EPOXY	封装代码：	HVSON
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	NOT SPECIFIED	座面最大高度：	0.8 mm
表面贴装：	YES	切换器配置：	BOOST
最大切换频率：	2750 kHz	温度等级：	AUTOMOTIVE
端子形式：	NO LEAD	端子节距：	0.5 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	3 mm	Base Number Matches：	1

LT3581HDE#TRPBF 数据手册

LT3581

PIN FUNCTIONS ^(DFN/MSOP)

FB (Pin 1/Pin 1): Positive and Negative Feedback Pin. For

CLKOUT (Pin 10/Pin 12): Clock Output Pin. Use this pin

to synchronize one or more other compatible switching

regulatorICstotheLT3581. Theclockthatthispinoutputs

runs at the same frequency as the internal oscillator of the

part or as the SYNC pin. CLKOUT may also be used as a

temperature monitor since the CLKOUT pin’s duty cycle

varies linearly with the part’s junction temperature. Note

that the CLKOUT pin is only meant to drive capacitive

loads up to 50pF.

a Boost or Inverting Converter, tie a resistor from the FB

pin to V

according to the following equations:

OUT

–1.215V





OUT

R_FB=

;Boost or SEPIC Converter









83.3•10^–6

|V |+ 9mV





OUT

R_FB=

;InvertingConverter









83.3•10^–6

V (Pin 2/Pin 2): Error Amplifier Output Pin. Tie external

SHDN (Pin 11/Pin 13): Shutdown Pin. In conjunction

with the UVLO (undervoltage lockout) circuit, this pin is

used to enable/disable the chip and restart the soft-start

sequence. Drive below 300mV to disable the chip. Drive

above 1.33V (typical) to activate the chip and restart the

soft-start sequence. Do not float this pin.

compensation network to this pin.

GATE (Pin 3/Pin 3): PMOS Gate Drive Pin. The GATE pin

is a pull-down current source, used to drive the gate of

an external PMOS for output short circuit protection or

outputdisconnect.TheGATEpincurrentincreaseslinearly

with the SS pin’s voltage, with a maximum pull-down

current of 933µA at SS voltages exceeding 500mV. Note

that if the SS voltage is greater than 500mVand the GATE

pin voltage is less than 2V, then the GATE pin looks like

a 2kΩ impedance to ground. See the Appendix for more

information.

RT (Pin 12/Pin 14): Timing Resistor Pin. Adjusts the

LT3581’s switching frequency. Place a resistor from this

pin to ground to set the frequency to a fixed free running

level. Do not float this pin.

SS (Pin 13/Pin 15): Soft-Start Pin. Place a soft-start

capacitor here. Upon start-up, the SS pin will be charged

by a (nominally) 250k resistor to about 2.1V. During a

fault, the SS pin will be slowly charged up and eventually

discharged as part of a timeout sequence (see the State

Diagram for more information on the SS pin’s role during

a fault event).

FAULT (Pin 4/Pin 4): Fault Indication Pin. This active low,

bidirectional pin can either be pulled low (below 750mV)

by an external source, or internally by the chip to indicate a

fault. When pulled low, this pin causes the power switches

to turn off, the GATE pin to become high impedance, the

CLKOUT pin to become disabled, and the SS pin to go

through a charge/discharge sequence. The end/absence

of a fault is indicated when the voltage on this pin exceeds

1V. A pull-up resistor or current source is needed on this

pin to pull it above 1V in the absence of a fault.

SYNC (Pin 14/Pin 16): To synchronize the switching

frequency to an outside clock, simply drive this pin with

a clock. The high voltage level of the clock must exceed

1.3V, and the low level must be less than 0.4V. Drive this

pin to less than 0.4V to revert to the internal free running

clock. See the Applications Information section for more

information.

(Pin 5/Pin 5): Input Supply Pin. Must be locally by-

passed.

SW1(Pins6,7/Pins6,7,8):MasterSwitchPin.Thisisthe

collector of the internal master NPN power switch.

Minimize the metal trace area connected to this pin to

minimize EMI.

GND (Exposed Pad Pin 15/Exposed Pad Pin 17): Ground.

Exposed pad must be soldered directly to local ground

plane.

SW2 (Pins 8, 9/Pins 9, 10, 11): Slave Switch Pin. This

is the collector of the internal slave NPN power switch.

Minimize the metal trace area connected to this pin to

minimize EMI.

3581fb

For more information www.linear.com/LT3581

1...4 5 678 9 10...36

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与LT3581HDE#TRPBF相关器件

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LT3581IDE#PBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: DFN; Pins: 1	获取价格
LT3581IDE#TRPBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: DFN; Pins: 1	获取价格
LT3581IDE-PBF	Linear	3.3A Boost/Inverting DC/DC Converter with Fault Protection	获取价格
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LT3581IMSE#TRPBF	Linear	LT3581 - 3.3A Boost/Inverting DC/DC Converter with Fault Protection; Package: MSOP; Pins:	获取价格
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