參數(shù)資料
型號(hào): LM3670MF-2.5
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 穩(wěn)壓器
英文描述: Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
中文描述: 0.75 A SWITCHING REGULATOR, 1300 kHz SWITCHING FREQ-MAX, PDSO5
封裝: SOT-23, 5 PIN
文件頁數(shù): 12/17頁
文件大?。?/td> 997K
代理商: LM3670MF-2.5
Operation Description
(Continued)
Soft-Start
The LM3670 will have a soft-start circuit that limits in-rush
current during start-up. Typical currents and times are:
Current (mA)
0
70
140
280
620
Duration (μSec)
32
224
256
256
until soft start ends
Note 4:
The first 32μS are to allow the bias currents to stabilize
LDO - Low Drop Out Operation
The LM3670 can operate at 100% duty cycle (no switching,
PMOS switch completely on) for low drop out support of the
output voltage. In this way the output voltage will be con-
trolled down to the lowest possible input voltage.
The minimum input voltage needed to support the output
voltage is
I
LOAD
R
DSON,
Load current
Drain to source resistance of PFET switch
in the triode region
R
INDUCTOR
Inductor resistance
PFET
20075803
FIGURE 5. Operation in PFM Mode and Transfer to PWM Mode
L
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM3670MF-3.3 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM3670MF-3.3/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM3670MF-3.3/NOPB 制造商:Texas Instruments 功能描述:DC/DC Converter IC
LM3670MF-ADJ 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM3670MF-ADJ/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK