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參數(shù)資料
| 型號： | REG103FA-2.5/500 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PSSO5 |
| 封裝： | GREEN, PLASTIC, TO-263, D2PAK, 5 PIN |
| 文件頁數(shù)： | 25/26頁 |
| 文件大?。?/td> | 830K |
| 代理商： | REG103FA-2.5/500 |
REG103
8
SBVS010D
BASIC OPERATION
The REG103 series is a family of LDO (Low Drop-Out)
linear regulators. The family includes five fixed output
versions (2.5V to 5.0V) and an adjustable output version. An
internal DMOS power device provides low dropout regula-
tion with near constant ground pin current (largely indepen-
dent of load and drop-out conditions) and very fast line and
load transient response. All versions include internal current
limit and thermal shutdown circuitry.
Figure 1 shows the basic circuit connections for the fixed
voltage models. Figure 2 gives the connections for the
adjustable output version (REG103A) and example resistor
values for some commonly used output voltages. Values for
other voltages can be calculated from the equation shown in
Figure 2. The SO-8 package provides two pins each for VIN
and VOUT. Both sets of pins MUST be used and connected
adjacent to the device.
FIGURE 1. Fixed Voltage Nominal Circuit for REG103.
REG103
ENABLE
V
OUT
C
OUT
V
IN
0.1
F
C
NR
0.01
F
ERROR
Gnd
NR
In
Out
Optional
None of the versions require an output capacitor for regula-
tor stability. The REG103 will accept any output capacitor
type less than 1
F. For capacitance values larger than 1F,
the effective ESR should be greater than 0.1
. This mini-
mum ESR value includes parasitics such as printed circuit
board traces, solder joints, and sockets. A minimum 0.1
F
low ESR capacitor connected to the input supply voltage is
recommended.
INTERNAL CURRENT LIMIT
The REG103 internal current limit has a typical value of
700mA. A fold-back feature limits the short-circuit current
to a typical short-circuit value of 40mA. This circuit will
protect the regulator from damage under all load conditions.
A typical characteristic of VOUT versus IOUT is given in
Figure 3a.
Care should be taken in high current applications to avoid
ground currents flowing in the circuit board traces causing
voltage drops between points on the circuit. If voltage drops
occur on the circuit board ground that causes the load ground
voltage to be much lower than the ground voltage seen by
the ground pin on the REG103, the foldback current may
approach zero and the REG103 may not start up. In these
types of applications, a large value resistor can be placed
between VIN and VOUT to help “boost” up the output of the
REG103 during start-up, see Figure 3b. The value for the
“boost” resistor should be chosen so that the current through
the “boost” resistor is less than the minimum load current:
RBOOST > (VIN – VOUT)/ILOAD. Typically, a good value for a
“boost” resistor is 5k
.
FIGURE 2. Adjustable Voltage Circuit for REG103A.
V
OUT = (1 + R1/R2) 1.295V
Pin numbers for SO-8 package.
REG103
V
IN
0.1
F
4
7
8
Gnd
V
OUT
R
1
C
FB
0.01
F
C
OUT
Adj
R
2
I
ADJ
Load
1
2
3
6
5
ERROR
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.
V
OUT (V)
R
1 ()
(1)
R
2 ()
(1)
1.295
Short
Open
2.5
12.1k
13k
1.21k
1.3k
3
16.9k
13k
1.69k
1.3k
3.3
20k
13k
2.0k
1.3k
5
37.4k
13k
3.74k
1.3k
NOTE: (1) Resistors are standard 1% values.
EXAMPLE RESISTOR VALUES
Optional
相關PDF資料 |
PDF描述 |
|---|---|
| REG103FA-2.5 | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PSSO5 |
| REG103FA-2.7 | 2.7 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PSSO5 |
| REG103FA-3.3/500 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PSSO5 |
| REG103FA-3.3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PSSO5 |
| REG103GA-3.3 | 3.3 V FIXED POSITIVE LDO REGULATOR, 0.2 V DROPOUT, PDSO6 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| REG103FA-3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| REG103FA3.3 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| REG103FA-3.3 | 制造商:BB 制造商全稱:BB 功能描述:DMOS 500mA Low Dropout Regulator |
| REG103FA-3.3/500 | 功能描述:低壓差穩(wěn)壓器 - LDO DMOS 500mA LDO Reg RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG103FA-3.3/500G3 | 功能描述:低壓差穩(wěn)壓器 - LDO DMOS 500mA LDO Reg RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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