参数资料
| 型号： | LT3008IDC-5#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V 20MA 6-DFN |
| 产品培训模块： | More Information on LDOs |
| 标准包装： | 500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 45 V |
| 电压 - 压降（标准）： | 0.3V @ 20mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 20mA |
| 电流 - 限制（最小）： | 22mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-WFDFN 裸露焊盘 |
| 供应商设备封装： | 6-DFN-EP（2x2） |
| 包装： | 带卷 (TR) |
LT3008 Series
APPLICATIONS INFORMATION
The LT3008 is a low dropout linear regulator with ultra-
low quiescent current and shutdown. Quiescent current
is extremely low at 3μA and drops well below 1μA in
shutdown. The device supplies up to 20mA of output current.
Dropout voltage at 20mA is typically 300mV. The LT3008
incorporates several protection features, making it ideal for
use in battery-powered systems. The device protects itself
against both reverse-input and reverse-output voltages.
In battery backup applications, where a backup battery
holds up the output when the input is pulled to ground,
the LT3008 acts as if a blocking diode is in series with its
to insure stability under minimum load conditions. In
shutdown, the output turns 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.
Speci?cations for output voltages greater than 0.6V are
proportional to the ratio of the desired output voltage to
0.6V: V OUT /0.6V. For example, load regulation for an output
current change of 100μA to 20mA is –0.5mV typical at
V OUT = 0.6V. At V OUT = 5V, load regulation is:
output and prevents reverse current ?ow. In applications
where the regulator load returns to a negative supply, the
5V
0.6V
? ( ? 0.5mV) = ? 4.17mV
output can be pulled below ground by as much as 50V
without affecting start-up or normal operation.
Adjustable Operation
The LT3008 has an output voltage range of 0.6V to 44.5V.
Table 1 shows resistor divider values for some com-
mon output voltages with a resistor divider current of
about 1μA.
Table 1. Output Voltage Resistor Divider Values
Figure 2 shows that output voltage is set by the ratio of two
external resistors. The IC regulates the output to maintain
the ADJ pin voltage at 600mV referenced to ground. The
current in R1 equals 600mV/R1 and the current in R2 is
the current in R1 minus the ADJ pin bias current. The ADJ
pin bias current, typically 400pA at 25°C, ?ows out of the
pin. Calculate the output voltage using the formula in Figure
2. An R1 value of 619k sets the divider current to 0.97μA.
Do not make R1’s value any greater than 619k to minimize
output voltage errors due to the ADJ pin bias current and
V OUT
1V
1.2V
1.5V
1.8V
2.5V
3V
3.3V
5V
R1
604k
590k
590k
590k
590k
590k
619k
590k
R2
402k
590k
887k
1.18M
1.87M
2.37M
2.8M
4.32M
V OUT = 600mV ? (1 + R2/R1) – (I ADJ ? R2)
V ADJ = 600mV
I ADJ = 0.4nA at 25°C
V IN
IN
LT3008
OUT
R2
V OUT
OUTPUT RANGE = 0.6V to 44.5V
SHDN
GND
ADJ
R1
3008 F02
Figure 2. Adjustable Operation
3008fc
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3008IDC-5TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA, 45V Low Dropout Linear Regulators |
| LT3008IDCPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA, 45V Low Dropout Linear Regulators |
| LT3008IDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA, 45V Low Dropout Linear Regulator |
| LT3008IDCTR | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA, 45V Low Dropout Linear Regulators |
| LT3008IDC-TR | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA, 45V Low Dropout Linear Regulator |
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