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参数资料
| 型号： | LT1529IT-3.3 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 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, 0.5 V DROPOUT, PSFM5 |
| 封装： | PLASTIC, TO-220, 5 PIN |
| 文件页数： | 8/12页 |
| 文件大小： | 139K |
| 代理商： | LT1529IT-3.3 |
8
LT1529
LT1529-3.3/LT1529-5
PI FU
function of voltage appears in the Typical Performance
Characteristics. If the SHDN pin is not used it can be left
open circuit. The device will be active, output on, if the
SHDN pin is not connected.
V
IN
(Pin 5):
Input Pin. Power is supplied to the device
through the V
IN
pin. The V
IN
pin should be bypassed to
ground if the device is more than six inches away from the
main input filter capacitor. In general, the output imped-
ance of a battery rises with frequency so it is advisable to
U
U
S
A
O
PPLICATI
IU
U
The LT1529 is a 3A low dropout regulator with mi-
cropower quiescent current and shutdown capable of
supplying 3A of output current at a dropout voltage of
0.6V. 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 quiescent current the LT1529
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 LT1529 acts
like it has a diode in series with its output and prevents
reverse current flow.
Adjustable Operation
The adjustable version of the LT1529 has an output
voltage range of 3.75V to 14V. 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 ADJ 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 ADJ pin bias current. The ADJ
pin bias current, 150nA at 25
°
C, flows through R2 into the
ADJ 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 ADJ pin bias current. Note that in shutdown the
output is turned off and the divider current will be zero.
Curves of ADJ Pin Voltage vs Temperature and ADJ Pin
include a bypass capacitor in battery-powered circuits. A
bypass capacitor in the range of 1
μ
F to 10
μ
F is sufficient.
The LT1529 is designed to withstand reverse voltages on
the V
IN
pin with respect to ground and OUTPUT pin. In the
case of a reversed input, which can happen if a battery is
plugged in backwards, the LT1529 will act as if there is a
diode in series with its input. There will be no reverse
current flow into the LT1529 and no reverse voltage will
appear at the load. The device will protect both itself and
the load.
+
V
IN
V
OUT
= 3.75V 1 + R1
ADJ
×
R2)
V
IN
V
OUT
R2
R1
1
2
3
LT1529 F02
5
4
OUTPUT
LT1529
SENSE
GND
SHDN
(
)
V
ADJ
= 3.75V
I
= 150nA AT 25
°
C
OUTPUT RANGE = 3.3V TO 14V
Figure 2. Adjustable Operation
Bias Current vs Temperature appear in the Typical Perfor-
mance Characteristics. The reference voltage at the ADJ
pin has a positive temperature coefficient of approxi-
mately 15ppm/
°
C. The ADJ pin bias current has a negative
temperature coefficient. These effects will tend to cancel
each other.
The adjustable device is specified with the ADJ pin tied to
the OUTPUT pin. This sets the output voltage to 3.75V.
Specifications for output voltage 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 3A is –0.5mV typical at
V
OUT
= 3.75V. At V
OUT
= 12V, load regulation would be:
12
3 75
.
–0 5
–1 6
V
V
mV
mV
(
)
=
(
)
相关PDF资料 |
PDF描述 |
|---|---|
| LT1529IT-5 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| LT1534IS-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1534-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1534CS-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LT1534 | Octal Bus Transceivers 20-PDIP 0 to 70 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1529IT-5 | 功能描述:IC REG LDO 5V 3A TO220-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT1529IT-5#PBF | 功能描述:IC REG LDO 5V 3A TO220-5 RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:1 系列:- 稳压器拓扑结构:正，固定式 输出电压:3V 输入电压:2.3 V ~ 5.5 V 电压 - 压降（标准）:0.035V @ 150mA 稳压器数量:2 电流 - 输出:150mA 电流 - 限制（最小）:300mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:6-UFDFN 裸露焊盘，6-TMLF? 供应商设备封装:6-TMLF?（1.6x1.6） 包装:Digi-Reel® 产品目录页面:1104 (CN2011-ZH PDF) 其它名称:576-3018-6 |
| LT-1530-110-012 | 制造商:Carling Technologies 功能描述:SINGLE-POLE, LIGHTED TOGGLE, RED LENS - Bulk |
| LT-1530-110-018 | 制造商:Carling Technologies 功能描述:LT-SERIES TOGGLE SWITCH - Bulk |
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