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参数资料
| 型号： | LT1764EQ-1.8 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 基准电压源/电流源 |
| 英文描述： | 3A, Fast Transient Response, Low Noise,LDO Regulators |
| 中文描述： | 1.8 V FIXED POSITIVE LDO REGULATOR, 0.66 V DROPOUT, PSSO5 |
| 封装： | PLASTIC, D2PAK-5 |
| 文件页数： | 13/16页 |
| 文件大小： | 213K |
| 代理商： | LT1764EQ-1.8 |
13
LT1764 Series
1764fa
device will protect both itself and the load. This provides
protection against batteries which can be plugged in
backward.
The output of the LT1764-X can be pulled below ground
without damaging the device. If the input is left open circuit
or grounded, the output can be pulled below ground by
20V. For fixed voltage versions, the output will act like a
large resistor, typically 5k or higher, limiting current flow
to typically less than 600
μ
A. For adjustable versions, the
output will act like an open circuit; no current will flow out
of the pin. If the input is powered by a voltage source, the
output will source the short-circuit current of the device
and will protect itself by thermal limiting. In this case,
grounding the SHDN pin will turn off the device and stop
the output from sourcing the short-circuit current.
The ADJ pin of the adjustable device can be pulled above
or below ground by as much as 7V without damaging the
device. If the input is left open circuit or grounded, the ADJ
pin will act like an open circuit when pulled below ground
and like a large resistor (typically 5k) in series with a diode
when pulled above ground.
In situations where the ADJ pin is connected to a resistor
divider that would pull the ADJ pin above its 7V clamp
voltage if the output is pulled high, the ADJ pin input
current must be limited to less than 5mA. For example, a
resistor divider is used to provide a regulated 1.5V output
from the 1.21V reference when the output is forced to 20V.
The top resistor of the resistor divider must be chosen to
limit the current into the ADJ pin to less than 5mA when the
ADJ pin is at 7V. The 13V difference between OUT and ADJ
pins divided by the 5mA maximum current into the ADJ pin
yields a minimum top resistor value of 2.6k.
In circuits where a backup battery is required, several
different input/output conditions can occur. The output
voltage may be held up while the input is either pulled to
ground, pulled to some intermediate voltage, or is left
open circuit. Current flow back into the output will follow
the curve shown in Figure 5.
When the IN pin of the LT1764-X is forced below the OUT
pin or the OUT pin is pulled above the IN pin, input current
will typically drop to less than 2
μ
A. This can happen if the
input of the device is connected to a discharged (low
voltage) battery and the output is held up by either a
backup battery or a second regulator circuit. The state of
the SHDN pin will have no effect on the reverse output
current when the output is pulled above the input.
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Figure 5. Reverse Output Current
OUTPUT VOLTAGE (V)
0
1
2
3
4
5
6
7
8
9
10
R
1764 F05
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
LT1764-2.5
LT1764-3.3
LT1764-1.8
LT1764
T
J
= 25
°
C
V
IN
= OV
CURRENT FLOWS INTO
OUTPUT PIN
V
OUT
= V
ADJ
(LT1764)
V
OUT
= V
FB
(LT1764-1.8,
LT1764-2.5, LT1764-3.3)
相关PDF资料 |
PDF描述 |
|---|---|
| LT1764EQ-2.5 | 3A, Fast Transient Response, Low Noise,LDO Regulators |
| LT1764EQ-3.3 | 3A, Fast Transient Response, Low Noise,LDO Regulators |
| LT1765-1.8 | Isolated Flyback Switching Regulator with 9V Output |
| LT1765-3.3 | CONTACT |
| LT1765-5 | TERMINAL |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1764EQ18TR | 制造商:LINEAR TEC 功能描述:NEW |
| LT1764EQ-2.5 | 功能描述:IC REG LDO 2.5V 3A DDPAK-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 |
| LT1764EQ-2.5#PBF | 功能描述:IC REG LDO 2.5V 3A DDPAK-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:8V 输入电压:10.5 V ~ 23 V 电压 - 压降（标准）:1.7V @ 40mA 稳压器数量:1 电流 - 输出:100mA（最小值） 电流 - 限制（最小）:- 工作温度:0°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SOIC 包装:剪切带 (CT) 产品目录页面:1075 (CN2011-ZH PDF) 其它名称:296-24390-1 |
| LT1764EQ-2.5#PBF | 制造商:Linear Technology 功能描述:IC, LDO VOLT REG, 2.5V, 3A, D2-PAK-5 |
| LT1764EQ-2.5#TR | 功能描述:IC REG LDO 2.5V 3A DDPAK-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 |
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