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參數(shù)資料
| 型號(hào)： | LT1312CS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Single PCMCIA VPP Driver/Regulator |
| 中文描述： | FIXED POSITIVE LDO REGULATOR, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SO-8 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 259K |
| 代理商： | LT1312CS8 |
10
LT1312
APPLICATIO
S I
N
FOR
ATIO
U
Transient and Switching Performance
The LT1312 is designed to produce minimal overshoot with
capacitors in the range of 1
μ
F to 10
μ
F. Larger capacitor
values can be used with a slowing of rise and fall times.
The positive output slew rate is determined by the 330mA
current limit and the output capacitor. The rise time for a
0V to 12V transition is approximately 40
μ
s, the rise time
for a 10
μ
F capacitor is roughly 400
μ
s (see the Transient
Response curves in the Typical Performance Characteris-
tics section).
The fall time from 12V to 0V is set by the output capacitor
and an internal pull-down current source which sinks
about 30mA. This source will fully discharge a 1
μ
F capaci-
tor in less than 1ms.
Thermal Considerations
Power dissipated by the device is the sum of two compo-
nents: output current multiplied by the input-output differ-
ential voltage I
OUT
×
(V
IN
– V
OUT
), and ground pin current
multiplied by supply voltage I
GND
×
V
IN
.
The ground pin current can be found by examining the
Ground Pin Current curves in the Typical Performance
Characteristics section.
Heat sinking, for surface mounted devices, is accom-
plished by using the heat spreading capabilities of the PC
board and its copper traces.
The junction temperature of the LT1312 must be limited to
125
°
C to ensure proper operation. Use Table 1 in conjunc-
tion with the typical performance graphs, to calculate the
power dissipation and die temperature for a particular
application and ensure that the die temperature does not
exceed 125
°
C under any operating conditions.
W
U
Table 1. S8 Package*
COPPER AREA
TOPSIDE
2500 sq mm
1000 sq mm
225 sq mm
1000 sq mm
*Device is mounted topside.
THERMAL RESISTANCE
BACKSIDE
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
BOARD AREA (JUNCTION-TO-AMBIENT)
2500 sq mm
2500 sq mm
2500 sq mm
1000 sq mm
120
°
C/W
120
°
C/W
125
°
C/W
131
°
C/W
Calculating Junction Temperature
Example: given an output voltage of 12V, an input supply
voltage of 14V, an output current of 100mA, and a
maximum ambient temperature of 50
°
C, what will the
maximum junction temperature be
Power dissipated by the device will be equal to:
I
OUT
×
(V
S
– VPP
OUT
) + (I
GND
×
V
IN
)
where:
I
OUT
= 100mA
V
IN
= 14V
I
GND
at (I
OUT
= 100mA, V
IN
= 14V) = 5mA
so,
P
D
= 100mA
×
(14V – 12V) + (5mA
×
15V) = 0.275W
Using Table 1, the thermal resistance will be in the range
of 120
°
C/W to 131
°
C/W depending upon the copper area.
So the junction temperature rise above ambient will be
less than or equal to:
0.275W
×
131
°
C/W = 36
°
C
The maximum junction temperature will then be equal to
the junction temperature rise above ambient plus the
maximum ambient temperature or:
T
JMAX
= 50
°
C + 36
°
C = 86
°
C.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1313 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual PCMCIA VPP Driver/Regulator |
| LT1313CS | 功能描述:IC DRV/REG PCMCIA VPP DUAL16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數(shù):2 輸出電壓:最低可調(diào)至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:30-TSSOP 包裝:帶卷 (TR) |
| LT1313CS#PBF | 功能描述:IC DRV/REG PCMCIA VPP DL 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
| LT1313CS#TR | 功能描述:IC DRIVER/REG VPP PCMCIA 16SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT1313CS#TRPBF | 功能描述:IC DRV/REG PCMCIA VPP DL 16SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,000 系列:- 應(yīng)用:電源，ICERA E400，E450 輸入電壓:4.1 V ~ 5.5 V 輸出數(shù):10 輸出電壓:可編程 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:42-WFBGA，WLCSP 供應(yīng)商設(shè)備封裝:42-WLP 包裝:帶卷 (TR) |
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