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參數(shù)資料
| 型號(hào)： | LT1176 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| 中文描述： | 抗輻射高效，5安培開關(guān)穩(wěn)壓器 |
| 文件頁數(shù)： | 3/4頁 |
| 文件大小： | 178K |
| 代理商： | LT1176 |
3
LT1176/LT1176-5
PARAMETER
Feedback Pin Bias Current (LT1176)
Reference Voltage (LT1176)
Reference Voltage Tolerance (LT1176)
CONDITIONS
V
FB
= V
REF
V
C
= 2V
V
REF
(Nominal) = 2.21V
All Conditions of Input Voltage, Output
Voltage, Temperature and Load Current
V
C
= 2V
V
OUT
(Nominal) = 5V
All Conditions of Input Voltage,
Temperature and Load Current
MIN
TYP
0.5
2.21
±
0.5
±
1.0
MAX
2
2.265
±
1.5
±
2.5
UNITS
G
μ
A
V
%
%
G
2.155
G
Sense Voltage (LT1176-5)
Sense Voltage Tolerance (LT1176-5)
G
4.85
5
5.15
±
2
±
3
V
±
0.5
±
1.0
%
%
G
Sense Pin Divider Resistance (LT1176-5)
Output Voltage Line Regulation
V
C
Voltage at 0% Duty Cycle
3
5
8
k
%/V
8V
≤
V
IN
≤
V
MAX
(Note 7)
G
0.005
1.5
–4.0
24
20
μ
A
2.45
0.30
±
5
4.5
0.25
9
30
0.02
V
Over Temperature
G
mV/
°
C
Multiplier Reference Voltage
Shutdown Pin Current
V
SHDN
≤
V
THRESHOLD
(
2.5V)
Shutdown Thresholds
V
V
SHDN
= 5V
G
G
Switch Duty Cycle = 0
Fully Shut Down
As a Percent of Output Voltage
I
STATUS
= 10
μ
A Sourcing
I
STATUS
= 1.6mA Sinking
5
10
50
2.2
0.1
±
4
3.5
μ
A
G
G
2.7
0.5
±
6
5.0
0.4
V
V
Status Window
Status High Level
Status Low Level
Status Delay Time
Status Minimum Width
%
V
V
μ
s
μ
s
G
G
ELECTRICAL C
HARA TERISTICS
T
J
= 25
°
C, V
IN
= 25V, unless otherwise noted
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
The
G
denotes specifications which apply over the full operating tempera-
ture range.
Note 1:
To calculate maximum switch “ON” voltage at current between low
and high conditions, a linear interpolation may be used.
Note 2:
A feedback pin voltage (V
FB
) of 2.5V forces the V
C
pin to its low
clamp level and the switch duty cycle to zero. This approximates the zero
load condition where duty cycle approaches zero. The LT1176-5 has
V
SENSE
= 5.5V.
Note 3:
Total voltage from V
IN
pin to ground pin must be
≥
8V after start-
up for proper regulation.
Note 4:
Switch frequency is internally scaled down when the feedback pin
voltage is less than 1.3V to avoid extremely short switch-on times. During
testing, V
FB
or V
SENSE
is adjusted to give a minimum switch-on time of 1
μ
s.
Note 5:
I
LM
= (R
LIM
– 1k)/7.65k
Note 6:
Switch to input voltage limitation must also be observed.
Note 7:
V
MAX
= 35V
Note 8:
Does not include switch leakage.
Note 9:
Error amplifier voltage gain and transconductance are specified
relative to the internal feedback node. To calculate gain and transconduc-
tance from the sense pin (Output) to the V
C
pin on the LT1176-5, multiply
by 0.44.
Power = I
LOAD
(V
OUT
/V
IN
) + V
IN
[7mA + 3mA (V
OUT
/V
IN
) + 0.012 (I
LOAD
)]
I
PEAK
= I
LOAD(PEAK)
+ [V
OUT
(V
IN
– V
OUT
)]/2E
5
(V
IN
)(L)
Example: V
IN
= 15V, V
OUT
= 5V, I
LOAD
= 0.5A Continuous, 0.8A Peak,
L = 100
μ
H
Power (I
LOAD
= 0.5A) = 0.38W
I
PEAK
(I
LOAD
= 0.8A) = 0.97A
Where component size or height is critical, we suggest using solid
tantalum capacitors (singly or in parallel), but be sure to use units rated
for switching applications. Coiltronics is a good source for low profile
surface mount inductors and AVX makes high quality surface mount
tantalum capacitors. For further help, use Application Notes 19 and 44,
LTC’s SwitcherCAD computer design program, and our knowledgeable
application department.
Application Hints
Although the LT1176 has a peak switch rating of 1.2A and a maximum duty
cycle of 85%, it must be used cautiously in applications which require high
switch current and high duty cycle simultaneously, to avoid excessive chip
temperature. Thermal resistance is 90
°
C/W for the 8-pin DIP package and
50
°
C/W for the 20-pin SO. This limits continuous chip power dissipation to
the 0.5W to 1W range. These numbers assume typical mounting techniques.
Extra or thick copper connected to the leads can reduce thermal resistance.
Bonding the package to the board or using a clip style heatsink can also help.
The following formulas will give chip power dissipation and peak switch
current for the standard buck converter. Note that surges less than 30
seconds do not need to be considered from a thermal standpoint, but for
proper regulation, they must not result in peak switch currents exceeding the
1.2A limit.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1176-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Step-Down Switching Regulator |
| LT1176CN8 | 功能描述:IC REG BUCK INV FLYBACK ADJ 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT1176CN8#PBF | 功能描述:IC REG BUCK INV FLYBACK ADJ 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT1176CN8-5 | 功能描述:IC REG BUCK INV FLYBK 5V 1A 8DIP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT1176CN8-5#PBF | 功能描述:IC REG BUCK INV FLYBK 5V 1A 8DIP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
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