参数资料
| 型号： | LTC3025IDC#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ .3A 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，可调式 |
| 输出电压： | 0.4 V ~ 3.6 V |
| 输入电压： | 0.9 V ~ 5.5 V |
| 电压 - 压降（标准）： | 0.045V @ 300mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 300mA（最小） |
| 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) |
LTC3025
BLOCK DIAGRAM
1
BIAS
6
SHDN
REFERENCE
SHDN 0.4V
SOFT-START
+
IN
3
–
6μA
2
GND
OUT
ADJ
4
5
3025 BD
APPLICATIONS INFORMATION
Operation (Refer to Block Diagram)
The LTC3025 is a micropower, VLDO (very low dropout)
linear regulator which operates from input voltages as
low as 0.9V. The device provides a high accuracy output
that is capable of supplying 300mA of output current with
I OUT
300mA
0mA
a typical dropout voltage of only 45mV. A single ceramic
capacitor as small as 1μF is all that is required for output
bypassing. A low reference voltage allows the LTC3025
output to be programmed to much lower voltages than
V OUT
AC
20mV/DIV
available in common LDOs (range of 0.4V to 3. 6V).
As shown in the Block Diagram, the BIAS input supplies
V IN = 1.5V
V OUT = 1.2V
V BIAS = 3.6V
C OUT = 1μF
100μs/DIV
3025 F01
the internal reference and LDO circuitry while all output
current comes directly from the IN input for high ef?ciency
regulation. The low quiescent supply currents I IN = 4μA,
I BIAS = 50μA drop to I IN = 1μA, I BIAS = 0.01μA typical in
shutdown making the LTC3025 an ideal choice for use in
battery-powered systems.
The device includes current limit and thermal overload
protection. The fast transient response of the follower
output stage overcomes the traditional tradeoff between
dropout voltage, quiescent current and load transient
response inherent in most LDO regulator architectures.
The LTC3025 also includes overshoot detection circuitry
which brings the output back into regulation when going
from heavy to light output loads (see Figure 1).
Figure 1. LTC3025 Transient Response
Adjustable Output Voltage
The output voltage is set by the ratio of two external resis-
tors as shown in Figure 2. The device servos the output
to maintain the ADJ pin voltage at 0.4V (referenced to
ground). Thus the current in R1 is equal to 0.4V/R1. For
good transient response, stability, and accuracy, the current
in R1 should be at least 8μA, thus the value of R1 should
be no greater than 50k. The current in R2 is the current in
R1 plus the ADJ pin bias current. Since the ADJ pin bias
current is typically <10nA, it can be ignored in the output
voltage calculation. The output voltage can be calculated
3025fd
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3025IDC-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:300mA Micropower VLDO Linear Regulator |
| LTC3026 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Adjustable 3A Single Resistor Low Dropout Regulator |
| LTC3026_1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Low Input Voltage VLDO Linear Regulator |
| LTC3026_1208 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5A Low Input Voltage VLDO Linear Regulator |
| LTC3026EDD | 制造商:Linear Technology 功能描述:LDO Regulator Pos 0.4V to 2.6V 1.5A 10-Pin DFN EP |
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