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參數(shù)資料
| 型號： | REG1117-2.85 |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 1.2 V DROPOUT, PDSO4 |
| 封裝： | PLASTIC, SOT-223, 4 PIN |
| 文件頁數(shù)： | 7/10頁 |
| 文件大?。?/td> | 123K |
| 代理商： | REG1117-2.85 |
6
REG1117
LINE TRANSIENT RESPONSE
60
40
20
0
–20
–40
5.25
4.25
3.25
Input
Voltage
(V)
Output
Voltage
Deviation
(mV)
0
20
40
60
80
100
120
140 160
180
200
Time (s)
C
IN = 1F
C
OUT = 10F Tantalum
I
OUT = 0.1A
At T
J = +25°C, all models, unless otherwise specified.
TYPICAL PERFORMANCE CURVE (cont.)
FIGURE 2. Adjustable-Voltage Model—Basic Connections.
0.1
Output
Voltage
Deviations
(V)
0
60
40
20
LOAD TRANSIENT RESPONSE
100
Time (
s)
80
0
–0.1
0.5
0
–0.5
Load
Current
(A)
C
IN = 10F
C
OUT = 10F
Tantalum
V
IN = 4.25V
Preload = 0.1A
APPLICATIONS INFORMATION
Figure 1 shows the basic hookup diagram for fixed-voltage
models. All models require an output capacitor for proper
operation and to improve high frequency load regulation. A
10
F tantalum capacitor is recommended. Aluminum elec-
trolytic types of 50
F or greater can also be used. A high
quality capacitor should be used to assure that the ESR
(effective series resistance) is less than 0.5
.
Figure 2 shows a hookup diagram for the adjustable voltage
model. Resistor values are shown for some commonly used
output voltages. Values for other voltages can be calculated
from the equation shown in Figure 2. For best load regula-
tion, connect R1 close to the output pin and R2 close to the
ground side of the load as shown.
FIGURE 1. Fixed-Voltage Model—Basic Connections.
REG1117
V
O
V
IN
10F
Tantalum
10F
Tantalum
++
VOUT (V)
R1 () (2)
R2 () (2)
1.25
Open
Short
1.5
750
147
2.1
158
107
2.85
169
215
3
137
191
3.3
115
187
5
113
340
10
113
787
REG1117
(Adj)
V
IN
V
O
C
2
10F
C
1
10F
C
3
(1)
10F
+
R
1
R
2
Load
32
1
NOTE: (1) C
3 optional. Improves high-frequency line rejection. (2) Resistors are standard 1% values.
V
O =
(1.25V) + (50A) (R
2)
R
1
R
1 + R2
This term is negligible with
proper choice of values—see
table at right.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| REG1117-3-TR | 3 V FIXED POSITIVE LDO REGULATOR, 1.2 V DROPOUT, PSSO3 |
| REG1117-2.85-TR | 2.85 V FIXED POSITIVE LDO REGULATOR, 1.2 V DROPOUT, PSSO3 |
| REG1117A-TR | ADJUSTABLE POSITIVE LDO REGULATOR, 1.55 V DROPOUT, PSSO3 |
| REG1117-3 | 3 V FIXED POSITIVE LDO REGULATOR, 1.2 V DROPOUT, PSSO3 |
| REG1117-3-TR | 3 V FIXED POSITIVE LDO REGULATOR, 1.2 V DROPOUT, PDSO4 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REG11172K5 | 制造商:TI 功能描述:New |
| REG1117-2K5 | 制造商:BB 制造商全稱:BB 功能描述:800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85, 3.3V, 5V, and Adjustable |
| REG11172K5G4 | 制造商:BB 制造商全稱:BB 功能描述:800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85, 3.3V, 5V, and Adjustable |
| REG1117-2K5G4 | 制造商:BB 制造商全稱:BB 功能描述:800mA and 1A Low Dropout Positive Regulator 1.8V, 2.5V, 2.85, 3.3V, 5V, and Adjustable |
| REG1117-3.3 | 功能描述:低壓差穩(wěn)壓器 - LDO 800mA & 1A LDO 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(diào)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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