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參數(shù)資料
| 型號： | LT1185CQ |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 2.5 V-25 V ADJUSTABLE NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSSO5 |
| 封裝： | PLASTIC, D2PAK-5 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大小： | 191K |
| 代理商： | LT1185CQ |
9
LT1185
1185ff
APPLICATIOU
for remote sense applications, they may need to be con-
sidered. Ground lead resistance of 0.4
would cause an
output voltage error of up to (3A/40)(0.4
) = 30mV, or
0.6% at V
OUT
= 5V. Note that if the sense leads are
connected as shown in Figure 2, with r
a
≈
0
, this error is
a fixed number of millivolts, and does not increase as a
function of DC output voltage.
W
U
U
Figure 3. Shutdown Techniques
R
LIM
4k
+
–
V
IN
R6
30k
R7
2.4k
R1
R2
V
OUT
+
Q1
2N3906
*
LT1185 F3a
*CMOS LOGIC
FOR HIGHER VALUES OF R
LIM
, MAKE R7 = (R
LIM
)(0.6)
5V
R5
300k
+
REF
GND
FB
V
OUT
V
IN
LT1185
5V Logic, Positive Regulated Output
5V Logic, Negative Regulated Output
R
LIM
–
LT1185 F03b
REF
GND
FB
V
OUT
LT1185
V
IN
R4
33k
5V
“HI” = OUTPUT “OFF”
3 EA 1N4148
V
IN
Q1
2N3906
Shutdown Techniques
The LT1185 can be shut down by open-circuiting the REF
pin. The current flowing into this pin must be less than
0.4
μ
A to guarantee shutdown. Figure 3 details several
ways to create the “open” condition, with various logic
levels. For variations on these schemes, simply remember
that the voltage on the REF pin is 2.4V negative with
respect to the ground pin.
Output Overshoot
Very high input voltage slew rate during start-up may
cause the LT1185 output to overshoot. Up to 20% over-
shoot could occur with input voltage ramp-up rate exceed-
ing 1V/
μ
s. This condition cannot occur with normal 50Hz
to 400Hz rectified AC inputs because parasitic resistance
and inductance will limit rate of rise even if the power
switch is closed at the peak of the AC line voltage. This
assumes that the switch is in the AC portion of the circuit.
If instead, a switch is placed directly in the regulator input
so that a large filter capacitor is precharged, fast input slew
rates will occur on switch closure. The output of the
regulator will slew at a rate set by current limit and output
capacitor size; dVdt = I
LIM
/C
OUT
. With I
LIM
= 3.6A and C
OUT
= 2.2
μ
F, the output will slew at 1.6V/
μ
s and overshoot can
occur. This overshoot can be reduced to a few hundred
millivolts or less by increasing the output capacitor to
10
μ
F and/or reducing current limit so that output slew rate
is held below 0.5V/
μ
s.
A second possibility for creating output overshoot is
recovery from an output short. Again, the output slews at
a rate set by current limit and output capacitance. To avoid
overshoot, the ratio I
LIM
/C
OUT
should be less than
0.5
×
10
6
. Remember that load capacitance can be added
to C
OUT
for this calculation. Many loads will have multiple
supply bypass capacitors that total more than C
OUT
.
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| LT1185CQ#PBF | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:3V 輸入電壓:最高 5.5V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.12V @ 150mA 穩(wěn)壓器數(shù)量:1 電流 - 輸出:150mA（最小值） 電流 - 限制（最?。?220mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細(xì)型，TSOT-23-5 供應(yīng)商設(shè)備封裝:TSOT-23-5 包裝:帶卷 (TR) 其它名稱:ADP160AUJZ-3.0-R7TR |
| LT1185CQ#TR | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:否 類別: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:3V 輸入電壓:2.3 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.035V @ 150mA 穩(wěn)壓器數(shù)量:2 電流 - 輸出:150mA 電流 - 限制（最?。?300mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 裸露焊盤，6-TMLF? 供應(yīng)商設(shè)備封裝:6-TMLF?（1.6x1.6） 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1104 (CN2011-ZH PDF) 其它名稱:576-3018-6 |
| LT1185CQ#TRPBF | 功能描述:IC REG LDO NEG ADJ 3A DDPAK-5 RoHS:是 類別: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:3V 輸入電壓:2.3 V ~ 5.5 V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.035V @ 150mA 穩(wěn)壓器數(shù)量:2 電流 - 輸出:150mA 電流 - 限制（最?。?300mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 裸露焊盤，6-TMLF? 供應(yīng)商設(shè)備封裝:6-TMLF?（1.6x1.6） 包裝:Digi-Reel® 產(chǎn)品目錄頁面:1104 (CN2011-ZH PDF) 其它名稱:576-3018-6 |
| LT1185CQPBF | 制造商:Linear Technology 功能描述:LDO Regulator Neg/Pos 2.5-25V 3A DDPAK6 |
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