参数资料
| 型号： | LT3009IDC-5#TRPBF |
| 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： | 2,500 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 最高 20V |
| 电压 - 压降（标准）： | 0.28V @ 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) |
LT3009 Series
APPLICATIONS INFORMATION
The LT3009 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 shut-
down. The device supplies up to 20mA of output current.
Dropout voltage at 20mA is typically 280mV. The LT3009
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 –0.7mV typical at
V OUT = 0.6V. At V OUT = 5V, load regulation is:
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.
5V
0.6V
? ( ? 0.7mV) = ? 5.83mV
In battery backup applications, where a backup battery
holds up the output when the input is pulled to ground,
the LT3009 acts as if a blocking diode is in series with its
output and prevents reverse current ?ow. In applications
where the regulator load returns to a negative supply, the
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
output can be pulled below ground by as much as 22V
without affecting startup or normal operation.
Adjustable Operation
The LT3009 has an output voltage range of 0.6V to 19.5V.
Figure 1 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
V OUT
1V
1.2V
1.5V
1.8V
2.5V
3V
3.3V
5V
R1
604k
604k
590k
590k
590k
590k
619k
590k
R2
402k
604k
887k
1.18M
1.87M
2.37M
2.8M
4.32M
the current in R1 minus the ADJ pin bias current. The
ADJ pin bias current, typically 300pA at 25°C, ?ows out
of the pin. Calculate the output voltage using the formula
in Figure 1. 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 to insure stability under minimum load condi-
tions. 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.
Because the ADJ pin is relatively high impedance (de-
pending on the resistor divider used), stray capacitances
at this pin should be minimized. Special attention should
be given to any stray capacitances that can couple ex-
ternal signals onto the ADJ pin producing undesirable
output transients or ripple.
Extra care should be taken in assembly when using high
valued resistors. Small amounts of board contamination
can lead to signi?cant shifts in output voltage. Appro-
priate post-assembly board cleaning measures should
V OUT = 600mV* (1 + R2/R1) – (I ADJ ? R2)
V ADJ = 600mV
I ADJ = 0.3nA at 25°C
V IN
IN
LT3009
OUT
R2
V OUT
OUTPUT RANGE = 0.6V to 19.5V
SHDN
GND
ADJ
R1
3009 F0
Figure 1. Adjustable Operation
3009fd
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3009IDC-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA Low Dropout Linear Regulators |
| LT3009IDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3μA IQ, 20mA Low Dropout Linear Regulators |
| LT300-AC | 制造商:ABB Low Voltage Products and Systems 功能描述:TERMINAL SHROUD,A210-A300 |
| LT300-AL | 制造商:ABB Control 功能描述:TERM SHROUD,A210-300,COMPR. |
| LT300-B | 制造商:Itox, Inc. 功能描述:UATXINTEL 945GC,LGA775,DDR2 400/533/667,PCI-EX16, 3PCI - Bulk |
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