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參數(shù)資料
| 型號(hào)： | LT1129-3.3 |
| 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： | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.4 V DROPOUT |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大小： | 276K |
| 代理商： | LT1129-3.3 |
8
LT1129/LT1129-3.3/LT1129-5
PI FU
current is 15
μ
A at the nominal regulated output voltage.
This pin is internally clamped to –0.6V (one V
BE
).
Adjust Pin:
For the LT1129 (adjustable version) the adjust
pin is the input to the error amplifier. This pin is internally
clamped to 6V and –0.6V (one V
BE
). This pin has a bias
current of 150nA which flows into the pin. See Bias Current
curve in the Typical Performance Characteristics. The
adjust pin reference voltage is equal to 3.75V referenced
to ground.
U
U
S
A
O
PPLICATI
IU
U
The LT1129 is a micropower low dropout regulator with
shutdown, capable of supplying 700mA of output current
at a dropout voltage of 0.4V. The device operates with very
low quiescent current (50
μ
A). In shutdown the quiescent
current drops to only 16
μ
A. In addition to the low quies-
cent current the LT1129 incorporates several protection
features which make it ideal for use in battery-powered
systems. The device is protected against reverse input
voltages. In battery backup applications where the output
can be held up by a backup battery when the input is pulled
to ground, the LT1129 acts like it has a diode in series with
its output and prevents reverse current flow.
Adjustable Operation
The adjustable version of the LT1129 has an output
voltage range of 3.75V to 30V. The output voltage is set by
the ratio of two external resistors as shown in Figure 2. The
device servos the output voltage to maintain the voltage at
the adjust pin at 3.75V. The current in R1 is then equal to
3.75V/R1. The current in R2 is equal to the sum of the
current in R1 and the adjust pin bias current. The adjust pin
bias current, 150nA at 25
°
C, flows through R2 into the
adjust pin. The output voltage can be calculated according
to the formula in Figure 2. The value of R1 should be less
than 400k to minimize errors in the output voltage caused
by the adjust pin bias current. Note that in shutdown the
output is turned off and the divider current will be zero.
Curves of Adjust Pin Voltage vs Temperature and Adjust
Pin Bias Current vs Temperature appear in the Typical
Performance Characteristics. The reference voltage at the
adjust pin has a positive temperature coefficient of ap-
proximately 15ppm/
°
C. The adjust pin bias current has a
negative temperature coefficient. These effects are small
and will tend to cancel each other.
The adjustable device is specified with the adjust pin tied
to the output pin. This sets the output voltage to 3.75V.
Specifications for output voltages greater than 3.75V will
be proportional to the ratio of the desired output voltage to
3.75V (V
OUT
/3.75V). For example: load regulation for an
output current change of 1mA to 700mA is –6mV typical
at V
OUT
= 3.75V. At V
OUT
= 12V, load regulation would be:
12
3 75
.
6
19
V
V
mV
mV
–
–
×
(
)
=
(
)
IN
LT1129
GND
SHDN
LT1129 F02
+
ADJ
OUT
R2
R1
V
OUT
= 3.75V 1 + R1
ADJ
R2
V
ADJ
= 3.75V
I
ADJ
= 150nA at 25°C
OUTPUT RANGE = 3.75V to 30V
(
)
(
)
V
OUT
Figure 2. Adjustable Operation
Figure 1. Kelvin Sense Connection
IN
LT1129
GND
SHDN
LT1129 F01
SENSE
OUT
R
P
+
1
μ
F
LOAD
+
10
μ
F
R
P
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT1129CS8 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1129CT-5 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1129IQ-5 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1129IS8 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1129 | Octal Buffers/Line Drivers with 3-State Outputs 20-SOIC 0 to 70 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1129-5 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower Low Dropout Regulators with Shutdown |
| LT1129CF-3.3 | 功能描述:IC REG LDO 3.3V .7A 20TSSOP RoHS:否 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，固定式和可調(diào)式 輸出電壓:3.3V，1.25 V ~ 5.7 V 輸入電壓:4.5 V ~ 7 V 電壓 - 壓降（標(biāo)準(zhǔn)）:1.1V @ 1A 穩(wěn)壓器數(shù)量:2 電流 - 輸出:1A 電流 - 限制（最?。?1A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-252-5，DPak（4 引線 + 接片），TO-252AD 供應(yīng)商設(shè)備封裝:PPAK 包裝:管件 其它名稱:497-3576-5 |
| LT1129CF-3.3#PBF | 制造商:Linear Technology 功能描述:3.3V 700MA UP LOW DROPOUT VR |
| LT1129CF-3.3#TR | 功能描述:IC REG LDO 3.3V .7A 20TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:800 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:2.5V 輸入電壓:最高 16V 電壓 - 壓降（標(biāo)準(zhǔn)）:0.7V @ 4A 穩(wěn)壓器數(shù)量:1 電流 - 輸出:4A 電流 - 限制（最小）:4.2A 工作溫度:0°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:TO-263-6，D²Pak（5 引線+接片），TO-263BA 供應(yīng)商設(shè)備封裝:TO-263-5 包裝:帶卷 (TR) 其它名稱:AP1184K525L-13AP1184K525LDITR |
| LT1129CH2.85 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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