参数资料
| 型号： | LT1965IT#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/22页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 1.1A TO220-5 |
| 产品培训模块： | LT1965 - 1.1A, Low Noise, Low Dropout Linear Regulator More Information on LDOs |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.2 V ~ 19.5 V |
| 输入电压： | 1.8 V ~ 20 V |
| 电压 - 压降（标准）： | 0.31V @ 1.1A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.1A |
| 电流 - 限制（最小）： | 1.2A |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-5 成形引线 |
| 供应商设备封装： | TO-220-5 |
| 包装： | 管件 |
LT1965 Series
APPLICATIONS INFORMATION
The input of the device withstands reverse voltages of 22V.
The LT1965 limits current flow to less than 1mA (typically
less than 300μA) and no negative voltage appears at the
output. The device protects both itself and the load against
batteries that are plugged in backwards.
The LT1965 incurs no damage if its output is pulled be-
low ground. If the input is left open-circuit or grounded,
the output can be pulled below ground by 22V. For fixed
voltage versions, the output will act like a large resistor,
typically 5k or higher, limiting current flow to typically
less than 300μA. For the adjustable version, the output
acts like an open circuit and no current flows from the
output. However, current flows out of (but is limited by)
the resistor divider that sets the output voltage. If the input
is powered by a voltage source, the LT1965 protects itself
by shutting off the output.
The LT1965 adjustable version incurs no damage if the
ADJ pin is pulled above or below ground by 9V. If the input
is left open-circuit or grounded, the ADJ pin performs like
a diode in series with typically 1.5k of resistance when
pulled below ground and like a large resistor (typically 5k
up to 3V on the ADJ pin and then 1.5k up to 9V) in series
with a diode when pulled above ground.
In situations where the ADJ pin connects to a resistor
divider that would pull the ADJ pin above its 9V 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 1.20V 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 9V. The 11V difference between the OUT
and ADJ pins divided by the 5mA maximum current into
the ADJ pin yields a minimum top resistor value of 2.2k.
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 follows the
curve shown in Figure 6.
If the LT1965’s IN pin is forced below the OUT pin or the
OUT pin is pulled above the IN pin, input current typically
drops to less than 2μA. This occurs if the LT1965 input
is connected to a discharged (low voltage) battery and
either a backup battery or a second regulator holds up
the output. The state of the SHDN pin has no effect on
the reverse-output current if the output is pulled above
the input.
T J = 25°C
6
V IN = 0V
5 V OUT = V ADJ (LT1965)
V OUT = V SENSE
(LT195-1.5/-1.8/-2.5/-3.3)
4 CURRENT FLOWS INTO
OUTPUT PIN
LT1965
3
2
1
LT1965-1.5
LT1965-1.8
0
0
1
2
3
4
LT1965-3.3
5 6
LT1965-2.5
7 8 9
OUTPUT VOLTAGE (V)
1965 F06
Figure 6. Reverse-Output Current
16
For more information www.linear.com/LT1965
1965fb
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