參數(shù)資料
型號(hào)： LP2952IM
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 基準(zhǔn)電壓源/電流源
英文描述： Adjustable Micropower Low-Dropout Voltage Regulators
中文描述： FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.8 V DROPOUT, PDSO16
封裝： SOIC-16
文件頁(yè)數(shù)： 13/22頁(yè)
文件大小： 1050K
代理商： LP2952IM
Application Hints
(Continued)
The next parameter which must be calculated is the maxi-
mum allowable temperature rise, T
R
(max). This is calculated
by using the formula:
T
R
(max) = T
J
(max) T
A
(max)
θ
(J–A)
= T
R
(max)/P(max)
where: T
(max)
is
the
maximum
temperature
T
A
(max) is the maximum ambient temperature
Using the calculated values for T
R
(max) and P(max), the
required value for junction-to-ambient thermal resistance,
θ
(J–A)
, can now be found:
The heatsink is made using the PC board copper. The heat
is conducted from the die, through the lead frame (inside the
part), and out the pins which are soldered to the PC board.
The pins used for heat conduction are given in
Table 1
.
allowable
junction
TABLE 1. Heat Conducting Pins
Part
Package
14-Pin DIP
Pins
3, 4, 5,
10, 11, 12
LP2952IN, LP2952AIN,
LP2952IN-3.3,
LP2952AIN-3.3
LP2953IN, LP2953AIN,
LP2953IN-3.3,
LP2953AIN-3.3
LP2952IM, LP2952AIM,
LP2952IM-3.3,
LP2952AIM-3.3,
LP2953IM, LP2953AIM,
LP2953IM-3.3,
LP2953AIM-3.3
16-Pin DIP
4, 5, 12, 13
16-Pin Surface
Mount
1, 8, 9, 16
Figure 2
shows copper patterns which may be used to
dissipate heat from the LP2952 and LP2953.
Table 2
shows
some values of junction-to-ambient thermal resistance (
θ
J–A
)
for values of L and W for 1 oz. copper.
TABLE 2. Thermal Resistance for Various Copper
Heatsink Patterns
Package
16-Pin DIP
L (in.)
1
2
3
4
6
1
2
3
1
2
3
6
4
2
H (in.)
0.5
1
1.5
0.19
0.19
0.5
1
1.5
0.5
1
1.5
0.19
0.19
0.19
θ
J–A
(C/W)
70
60
58
66
66
65
51
49
83
70
67
69
71
73
14-Pin DIP
Surface Mount
HEATSINK REQUIREMENTS (Military Temperature
Range Devices)
The
maximum
allowable
LP2953AMJ is limited by the maximum junction temperature
(+150C) and the two parameters that determine how quickly
heat flows away from the die:
the ambient temperature and
the junction-to-ambient thermal resistance of the part
.
power
dissipation
for
the
01112707
FIGURE 1. P
= (V
V
) I
L
+ (V
IN
) I
G
Current/Voltage Diagram
01112708
* For best results, use L = 2H
** 14-Pin DIP is similar, refer to
Table 1
for pins designated for
heatsinking.
FIGURE 2. Copper Heatsink Patterns
L
www.national.com
13
相關(guān)PDF資料
PDF描述
LP2952AIN-3.3 Adjustable Micropower Low-Dropout Voltage Regulators
LP2952IN-3.3 Adjustable Micropower Low-Dropout Voltage Regulators
LP2952AIM Adjustable Micropower Low-Dropout Voltage Regulators
LP2952IN Adjustable Micropower Low-Dropout Voltage Regulators
LP2952AI-3.3 Adjustable Micropower Low-Dropout Voltage Regulators
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LP2952IM 制造商:Texas Instruments 功能描述:V REG LDO ADJ +1.23/29V SMD 2952
LP2952IM/NOPB 功能描述:低壓差穩(wěn)壓器 - LDO Adj Micropower LDO Voltage Regulator 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
LP2952IM-3.3 制造商:Texas Instruments 功能描述:Voltage Regulator, +3.3V, Bi-Polar, 16 Pin, Plastic, SOP
LP2952IM-3.3/NOPB 功能描述:IC REG LDO 3.3V .25A 16-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:4V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.28V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA 電流 - 限制（最小）:- 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:5-VFBGA 供應(yīng)商設(shè)備封裝:5-uSMD 包裝:Digi-Reel® 其它名稱(chēng):LP2985AIBP-4.0DKR
LP2952IMX 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
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