欢迎访问ic37.com |
会员登录 免费注册
发布采购

REG103UA-2.5/2K5G4 参数 Datasheet PDF下载

REG103UA-2.5/2K5G4图片预览
型号: REG103UA-2.5/2K5G4
PDF下载: 下载PDF文件 查看货源
内容描述: 500毫安低压差稳压器 [500mA Low-Dropout Regulator]
分类和应用: 稳压器
文件页数/大小: 26 页 / 937 K
品牌: TI [ TEXAS INSTRUMENTS ]
 浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第5页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第6页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第7页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第8页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第10页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第11页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第12页浏览型号REG103UA-2.5/2K5G4的Datasheet PDF文件第13页  
3.5
3
Output Voltage (V)
100
2.5
2
1.5
1
0.5
0
0
100
200
300
400
500
600
700
800
Enable Current (µA)
Output Current (mA)
10
1
0.1
0.01
0.001
0
2
4
6
8
10
12
14
16
Enable Voltage
(a) Foldback Current Limit of the REG103-3.3 at 25°C.
R
BOOST
FIGURE 5. ENABLE Pin Current versus Applied Voltage.
V
IN
+
0.1µF
Gnd
(1) Optional.
V
OUT
+
0.1µF
(1)
Load
ERROR FLAG
The error indication pin, only available on the SO-8 package
version, provides a fault indication out-of-regulation condi-
tion. During a fault condition, ERROR is pulled LOW by an
open drain output device. The pin voltage, in the fault state,
is typically less than 0.2V at 500µA.
A fault condition is indicated when the output voltage differs
(either above or below) from the specified value by approxi-
mately 10%. Figure 6 shows a typical fault-monitoring
application.
REG103
(b) Foldback Current Boost Circuit.
FIGURE 3. Foldback Current Limit and Boost Circuit.
ENABLE
The ENABLE pin allows the regulator to be turned on and
off. This pin is active HIGH and compatible with standard
TTL-CMOS levels. Inputs below 0.5V (max) turn the regu-
lator off and all circuitry is disabled. Under this condition,
ground pin current drops to approximately 0.5µA. When not
used, the ENABLE pin may be connected to V
IN
.
Internal to the part, the ENABLE pin is connected to an
input resistor-zener diode circuit, as shown in Figure 4,
creating a nonlinear input impedance. The ENABLE Pin
Current versus Applied Voltage relationship is shown in
Figure 5. When the ENABLE pin is connected to a voltage
greater than 10V, a series resistor may be used to limit the
current.
+5V
10kΩ
Pull-up
µP
6 ERROR 3
ENABLE
Open
Drain
REG103
SO-8 Package
Only
FIGURE 6. ERROR Pin Typical Fault-Monitoring Circuit.
ENABLE
175kΩ
V
Z
= 10V
FIGURE 4. ENABLE Pin Equivalent Input Circuit.
OUTPUT NOISE
A precision band-gap reference is used for the internal
reference voltage, V
REF
, for the REG103. This reference is
the dominant noise source within the REG103. It generates
approximately 45µVrms in the 10Hz to 100kHz bandwidth
at the reference output. The regulator control loop gains up
the reference noise, so that the noise voltage of the regulator
is approximately given by:
V
N
=
45
µ
Vrms
V
R
1
+
R
2
=
45
µ
Vrms
OUT
R2
V
REF
REG103
SBVS010D
9