參數(shù)資料
型號(hào)： LP3906SQ-TKXII
廠(chǎng)商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, QCC24
封裝： 5 X 4 MM, 0.80 MM HEIGHT, LLP-24
文件頁(yè)數(shù)： 30/40頁(yè)
文件大小： 4200K
代理商： LP3906SQ-TKXII
High Vin-High Load Operation
Additional information is provided when the IC is operated at
extremes of Vin and regulator loads. These are described in
terms of the Junction temperature and, Buck output ripple
management.
Junction Temperature
The maximum junction temperature TJ-MAX-OP of 125C of
the IC package.
The following equations demonstrate junction temperature
determination, ambient temperature TA-MAX and Total chip
power must be controlled to keep TJ below this maximum:
TJ-MAX-OP
= TA-MAX + (
θJA) [ °C/ Watt] * (PD-MAX)
[Watts]
Total IC power dissipation PD-MAX is the sum of the individ-
ual power dissipation of the four regulators plus a minor
amount for chip overhead. Chip overhead is Bias, TSD & LDO
analog.
PD-MAX
= P
LDO1 + PLD02 + PBUCK1 + PBUCK2 + (0.0001A * Vin)
[Watts].
Power dissipation of LDO1
P
LDO1 = (VinLDO1- VoutLDO1) * IoutLDO1 [V*A]
Power dissipation of LDO2
P
LDO2 = (VinLDO2 - VoutLDO2) * IoutLDO2 [V*A]
Power dissipation of Buck1
P
Buck1 = PIN – POUT =
Vout
Buck1* IoutBuck1 * (1 -η
1) / η1 [V*A]
η1 = efficiency of buck 1
Power dissipation of Buck2
P
Buck2 = PIN – POUT =
Vout
Buck2 * IoutBuck2 * (1 - η
2) / η2 [V*A]
η2 = efficiency of buck 2
η is the efficiency for the specific condition taken from effi-
ciency graphs.
Buck Output Ripple Management
If Vin and ILoad increase, the output ripple associated with
the Buck Regulators also increases. The figure below shows
the safe operating area. To ensure operation in the area of
concern it is recommended that the system designer circum-
vents the output ripple issues to install schottky diodes on the
Bucks(s) that are expected to perform under these extreme
corner conditions.
(Schottky diodes are recommended to reduce the output rip-
ple if the system requirements include this shaded area of
operation. Vin > 5.2 V and Iload > 1.24 A)
LP3906 Buck Converter
V
IN vs ILOAD Operating Ranges
20197864
www.national.com
36
LP3906
相關(guān)PDF資料
PDF描述
LP3906SQX-TKXII SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, QCC24
LP3906SQDJXI 2 A DUAL SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, QCC24
LP3906SQXJXXI 2 A DUAL SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, QCC24
LP3906SQXVPFP 2 A DUAL SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, QCC24
LP3906SQXPPXP 2 A DUAL SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, QCC24
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP3906SQ-TKXII/NOPB 功能描述:低壓差穩(wěn)壓器 - LDO RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
LP3906SQ-VPFP 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LP3906SQ-VPFP S7002740 制造商:Texas Instruments 功能描述:- Tape and Reel 制造商:Texas Instruments 功能描述:Texas Instruments LP3906SQ-VPFP S7002740
LP3906SQ-VPFP/NOPB 功能描述:其他電源管理 RoHS:否 制造商:Texas Instruments 輸出電壓范圍: 輸出電流:4 mA 輸入電壓范圍:3 V to 3.6 V 輸入電流: 功率耗散: 工作溫度范圍:- 40 C to + 110 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-48 封裝:Reel
LP3906SQX-DJXI 制造商:Texas Instruments 功能描述:Power Management Unit 24-Pin LLP EP T/R
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠(chǎng)商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*