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參數(shù)資料
| 型號： | REG104GA-2.7G4 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | DMOS 1A Low-Dropout Regulator |
| 中文描述： | DMOS的1A低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 10/22頁 |
| 文件大小： | 439K |
| 代理商： | REG104GA-2.7G4 |
SBVS025G
REG104
10
connected from the output to the adjust pin will reduce both
the output noise and the peak error from a load transient.
Figure 7 shows improved output noise performance for two
capacitor combinations.
FIGURE 7. Output Noise Density on Adjustable Versions.
FIGURE 8. Transient and DC Dropout.
For large step changes in load current, the REG104 requires
a larger voltage drop across it to avoid degraded transient
response. The boundary of this transient dropoutregion is
shown as the top line in Figure 8. Values of V
IN
to V
OUT
voltage drop above this line insure normal transient re-
sponse.
In the transient dropout region between DCand Transient
transient response recovery time increases. The time re-
quired to recover from a load transient is a function of both
the magnitude and rate of the step change in load current
and the available headroomV
IN
to V
OUT
voltage drop. Under
worst-case conditions (full-scale load change with V
IN
to
V
OUT
voltage drop close to DC dropout levels), the REG104
can take several hundred microseconds to re-enter the
specified window of regulation.
TRANSIENT RESPONSE
The REG104 response to transient line and load conditions
improves at lower output voltages. The addition of a capaci-
tor (nominal value 10nF) from the output pin to ground may
improve the transient response. In the adjustable version, the
addition of a capacitor, C
FB
(nominal value 10nF), from the
output to the adjust pin will also improve the transient
response.
THERMAL PROTECTION
Power dissipated within the REG104 will cause the junction
temperature to rise. The REG104 has thermal shutdown
circuitry that protects the regulator from damage. The ther-
mal protection circuitry disables the output when the junc-
tion temperature reaches approximately 150
°
C, allowing
the device to cool. When the junction temperature cools to
approximately 130
°
C, the output circuitry is again enabled.
Depending on various conditions, the thermal protection
circuit may cycle on and off. This limits the dissipation of the
regulator, but may have an undesirable effect on the load.
Any tendency to activate the thermal protection circuit indi-
cates excessive power dissipation or an inadequate heat
sink. For reliable operation, junction temperature should be
limited to 125
°
C, maximum. To estimate the margin of safety
in a complete design (including heat sink), increase the
ambient temperature until the thermal protection is triggered.
Use worst-case loads and signal conditions. For good reli-
ability, thermal protection should trigger more than 35
°
C
above the maximum expected ambient condition of your
application. This produces a worst-case junction temperature
of 125
°
C at the highest expected ambient temperature and
worst-case load.
The internal protection circuitry of the REG104 has been
designed to protect against overload conditions. It was not
intended to replace proper heat sinking. Continuously run-
ning the REG104 into thermal shutdown will degrade reliabil-
ity.
250
200
150
100
50
0
D
0
100
200
300
400
500
I
OUT
(mA)
REG104
–
3.3 at 25
°
C
DC
Transient
100
10
1000
10000
100000
10.0
1.0
0.1
n
√
H
Frequency
C
OUT
= 0, C
FB
= 0
C
OUT
= 0, C
= 0.01
μ
F
C
OUT
= 10
μ
F, C
FB
= 0.01
μ
F
The REG104 utilizes an internal charge pump to develop an
internal supply voltage sufficient to drive the gate of the
DMOS pass element above V
IN
. The charge-pump switching
noise (nominal switching frequency = 2MHz) is not measur-
able at the output of the regulator.
DROP-OUT VOLTAGE
The REG104 uses an N-channel DMOS as the passele-
ment. When the input voltage is within a few hundred
millivolts of the output voltage, the DMOS device behaves
like a resistor. Therefore, for low values of V
IN
to V
OUT
, the
regulator
’
s input-to-output resistance is the Rds
ON
of the
DMOS pass element (typically 230m
). For static (DC)
loads, the REG104 will typically maintain regulation down to
V
IN
to V
OUT
voltage drop of 230mV at full rated output current.
In Figure 8, the bottom line (DC dropout) shows the minimum
V
IN
to V
OUT
voltage drop required to prevent dropout under
DC load conditions.
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| REG104GA-3 | 功能描述:低壓差穩(wěn)壓器 - LDO DMOS 1A 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG104GA-3.3 | 功能描述:低壓差穩(wěn)壓器 - LDO DMOS 1A 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG104GA-3.3 | 制造商:Texas Instruments 功能描述:LINEAR VOLTAGE REGULATOR IC |
| REG104GA-3.3/2K5 | 功能描述:低壓差穩(wěn)壓器 - LDO DMOS 1A 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| REG104GA-3.3/2K5G4 | 功能描述:低壓差穩(wěn)壓器 - LDO DMOS 1A 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(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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