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参数资料
| 型号： | REG101NA-2.5/3KG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.13 V DROPOUT, PDSO5 |
| 封装： | GREEN, PLASTIC, SOT-23, 5 PIN |
| 文件页数： | 23/23页 |
| 文件大小： | 719K |
| 代理商： | REG101NA-2.5/3KG4 |
REG101
9
SBVS026D
BASIC OPERATION
The REG101 series of LDO (Low Drop-Out) linear regula-
tors offers a wide selection of fixed output voltage versions
and an adjustable output version. The REG101 belongs to a
family of new generation LDO regulators that utilize a
DMOS pass transistor to achieve ultra-low dropout perfor-
mance and freedom from output capacitor constraints. Ground
pin current remains under 650
A over all line, load, and
temperature conditions. All versions have thermal and over-
current protection, including foldback current limit.
The REG101 does not require an output capacitor for regu-
lator stability and is stable over most output currents and
with almost any value and type of output capacitor up to
10
F or more. For applications where the regulator output
current drops below several milliamps, stability can be
enhanced by: adding a 1k
to 2k load resistor; using
capacitance values less than 10
F; or keeping the effective
series resistance greater than 0.05
including the capacitor’s
ESR and parasitic resistance in printed circuit board traces,
solder joints, and sockets.
Although an input capacitor is not required, it is good analog
design practice to connect a 0.1
F low ESR capacitor across
FIGURE 1. Fixed Voltage Nominal Circuit for REG101.
REG101
Enable
V
OUT
C
OUT
V
IN
0.1
F
C
NR
0.01
F
Gnd
NR
In
Out
Optional
the input supply voltage. This is recommended to improve
ripple rejection by reducing input voltage ripple.
Figure 1 shows the basic circuit connections for the fixed
voltage models. Figure 2 gives the connections for the
adjustable output version (REG101A) and example resistor
values for some commonly used output voltages. Values for
other voltages can be calculated from the equation shown in
Figure 2.
INTERNAL CURRENT LIMIT
The REG101 internal current limit has a typical value of
170mA. A foldback feature limits the short-circuit current to
a typical short-circuit value of 60mA. This helps to protect
the regulator from damage under all load conditions. A
characteristic of VOUT versus IOUT is given in Figure 3 and
in the Typical Characteristics section.
FIGURE 2. Adjustable Voltage Circuit for REG101A.
FIGURE 3. Foldback Current Limit of the REG101-3.3 at
25
°C.
040
20
140
160
80
100
120
60
180
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
Output
Voltage
(V)
Output Current (mA)
FOLDBACK CURRENT LIMIT
I
CL
I
CL
REG101-3.3
V
OUT = (1 + R1/R2) 1.267V
Pin numbers for SOT23 package.
REG101
V
IN
0.1
F
2
1
Gnd
V
OUT
R
1
C
FB
0.01
F
C
OUT
Adj
R
2
I
ADJ
Load
5
4
3
Enable
To reduce current through divider, increase resistor
values (see table at right).
As the impedance of the resistor divider increases,
I
ADJ (~200nA) may introduce an error.
C
FB improves noise and transient response.
Optional
V
OUT (V)
R
1 (W)
(1)
R
2 ()
(1)
2.5
11.3k
11.5k
1.13k
1.15k
3.0
15.8k
11.5k
1.58k
1.15k
3.3
18.7k
11.5k
1.87k
1.15k
5.0
34.0k
11.5k
3.40k
1.15k
NOTE: (1) Resistors are standard 1% values.
EXAMPLE RESISTOR VALUES
相关PDF资料 |
PDF描述 |
|---|---|
| REG101NA-2.8/250G4 | 2.8 V FIXED POSITIVE LDO REGULATOR, 0.13 V DROPOUT, PDSO5 |
| REG101UA-2.5G4 | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.13 V DROPOUT, PDSO8 |
| REG101UA-2.85G4 | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.13 V DROPOUT, PDSO8 |
| REG101UA-2.8G4 | 2.8 V FIXED POSITIVE LDO REGULATOR, 0.13 V DROPOUT, PDSO8 |
| REG101UA-3.3/2K5G4 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.13 V DROPOUT, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| REG101NA-3.0/250 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DMOS 100mA Low-Dropout Regulator |
| REG101NA-3.0/250G4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DMOS 100mA Low-Dropout Regulator |
| REG101NA-3.0/3K | 制造商:TI 制造商全称:Texas Instruments 功能描述:DMOS 100mA Low-Dropout Regulator |
| REG101NA-3.0/3KG4 | 制造商:TI 制造商全称:Texas Instruments 功能描述:DMOS 100mA Low-Dropout Regulator |
| REG101NA-3.3/250 | 功能描述:低压差稳压器 - LDO DMOS 100mA LDO Reg RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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