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参数资料
| 型号： | LT3020IMS8-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.8V .1A 8-MSOP |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.8V |
| 输入电压： | 最高 10V |
| 电压 - 压降（标准）： | 0.15V @ 100mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 100mA |
| 电流 - 限制（最小）： | 110mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 带卷 (TR) |
LT3020/LT3020-1.2/
LT3020-1.5/LT3020-1.8
BLOCK DIAGRA
IN
(7, 8)
SHDN
(5)
SHUTDOWN
THERMAL
SHUTDOWN
R3
D1
Q3
BIAS CURRENT
200mV
ERROR AMP
CURRENT
GAIN
Q1
AND
REFERENCE
D2
OUT
(1, 2)
GENERATOR
212mV
–
NO-LOAD
RECOVERY
+
Q2
R2
25k
OUT SENSE
(3)
ADJ
(3)
NOTE:
FOR LT3020 ADJUST PIN 3 IS CONNECTED TO
THE ADJUST PIN, R1 AND R2 ARE EXTERNAL.
FOR LT3020-1.X PIN 3 IS CONNECTED TO THE
OUTPUT SENSE PIN, R1 AND R2 ARE INTERNAL.
FIXED
V OUT
1.2V
1.5V
1.8V
R1 R2
20k 100k
20k 130k
20k 160k
R1
3020 BD
GND
(4,9)
APPLICATIO S I FOR ATIO
The LT3020 is a very low dropout linear regulator capable
of 0.9V input supply operation. Devices supply 100mA of
output current and dropout voltage is typically 150mV.
Quiescent current is typically 120 μ A and drops to 3 μ A in
shutdown. The LT3020 incorporates several protection
features, making it ideal for use in battery-powered sys-
tems. The device protects itself against reverse-input and
reverse-output voltages. In battery backup applications
where the output is held up by a backup battery when the
input is pulled to ground, the LT3020 acts as if a diode is
in series with its output which prevents reverse current
flow. In dual supply applications where the regulator load
is returned to a negative supply, the output can be pulled
current in R2 is the current in R1 minus the ADJ pin bias
current. The ADJ pin bias current of 20nA flows out of the
pin. Use the formula in Figure 1 to calculate output voltage.
An R1 value of 20k sets the resistor divider current to
10 μ A. Note that in shutdown the output is turned off and
the divider current is zero. Curves of ADJ Pin Voltage vs
Temperature and ADJ Pin Bias Current vs Temperature
appear in the Typical Performance Characteristics section.
Specifications for output voltages greater than 200mV are
proportional to the ratio of desired output voltage to
200mV; (V OUT /200mV). For example, load regulation for
below ground by as much as 10V without affecting start-
up or normal operation.
V IN
IN OUT
LT3020-ADJ
SHDN ADJ
R2
+
V OUT
GND
R1
( )
V OUT = 200mV 1 + R2 – I ADJ (R2)
Adjustable Operation
The LT3020’s output voltage range is 0.2V to 9.5V. Figure
1 shows that the output voltage is set by the ratio of two
external resistors. The device regulates the output to
maintain the ADJ pin voltage at 200mV referenced to
ground. The current in R1 equals 200mV/R1 and the
3020 F01
R1
V ADJ = 200mV
I ADJ = 20nA AT 25 ° C
OUTPUT RANGE = 0.2V TO 9.5V
Figure 1. Adjustable Operation
3020fc
9
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相关代理商/技术参数 |
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