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參數資料
| 型號： | TPS79285 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 200mA Low Quiescent Current, Ultra-Low Noise, High PSRR, Low Dropout Linear Regulator |
| 中文描述： | 200mA低靜態電流，超低噪聲，高PSRR，低壓差線性穩壓 |
| 文件頁數： | 11/18頁 |
| 文件大小： | 377K |
| 代理商： | TPS79285 |
www.ti.com
APPLICATION INFORMATION
TPS799xx
GND
EN
NR
IN
OUT
V
IN
V
OUT
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
Optional bypass capacitor
to reduce output noise
and increase PSRR.
2.2
μ
F
Ceramic
V
EN
TPS799xx
GND
EN
FB
IN
OUT
V
IN
V
OUT
R
1
C
FB
R
2
Optional input capacitor.
May improve source
impedance, noise, or PSRR.
V
OUT
=
×
1.193
(R
1
+ R
2
)
R
2
V
EN
2.2
μ
F
Ceramic
Input and Output Capacitor Requirements
Although an input capacitor is not required for stability, it is good analog design practice to connect a 0.1μF to
1μF low ESR capacitor across the input supply near the regulator. This will counteract reactive input sources and
improve transient response, noise rejection, and ripple rejection. A higher-value capacitor may be necessary if
large, fast rise-time load transients are anticipated or the device is located several inches from the power source.
If source impedance is not sufficiently low, a 0.1μF input capacitor may be necessary to ensure stability.
Feedback Capacitor Requirements (TPS79901 only)
The feedback capacitor, C
FB
, shown in
Figure 29
is required for stability. For a parallel combination of R
1
and R
2
equal to 250k
, any value from 3pF to 1nF can be used. Fixed voltage versions have an internal 30pF feedback
capacitor which is quick-charged at start-up. The adjustable version does not have this quick-charge circuit, so
values below 5pF should be used to ensure fast startup; values above 47pF can be used to implement an output
voltage soft-start. Larger value capacitors also improve noise slightly. The TPS79901 is stable in unity-gain
configuration (OUT tied to FB) without C
FB
.
TPS79901, TPS79915, TPS79916, TPS79918
TPS79925, TPS79927, TPS79928, TPS799285
TPS79929, TPS79930, TPS79932, TPS79933
SBVS056C–JANUARY 2005–REVISED MAY 2005
The TPS799xx family of LDO regulators combines the high performance required of many RF and precision
analog applications with ultra-low current consumption. High PSRR is provided by a high gain, high bandwidth
error loop with good supply rejection at very low headroom (V
IN
– V
OUT
). Fixed voltage versions provide a noise
reduction pin to bypass noise generated by the bandgap reference and to improve PSRR while a quick-start
circuit fast-charges this capacitor at startup for quick startup times. The combination of high performance and low
ground current also make the TPS799xx an excellent choice for portable applications. All versions have thermal
and over-current protection and are fully specified from –40°C to +125°C.
Figure 28
shows the basic circuit connections for fixed voltage models.
Figure 29
gives the connections for the
adjustable output version (TPS79901). R
1
and R
2
can be calculated for any output voltage using the formula in
Figure 29
. Sample resistor values for common output voltages are shown in
Figure 29
.
Figure 28. Typical Application Circuit for
Fixed Voltage Versions
Figure 29. Typical Application Circuit for
Adjustable Voltage Version
The TPS799xx is designed to be stable with standard ceramic capacitors of values 2.2μF or larger. X5R and
X7R type capacitors are best as they have minimal variation in value and ESR over temperature. Maximum ESR
should be < 1.0
.
11
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS79301DBVR | 功能描述:低壓差穩壓器 - LDO 200mA Adj Hi PSRR 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:0.3 % 輸出端數量: 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 |
| TPS79301DBVR | 制造商:Texas Instruments 功能描述:Linear Voltage Regulator IC |
| TPS79301DBVREP | 功能描述:低壓差穩壓器 - LDO Mil Enh Ultra Lo Noise Hi PSRR 200mA 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:0.3 % 輸出端數量: 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 |
| TPS79301DBVRG4 | 功能描述:低壓差穩壓器 - LDO High PSRR Fast RF High-Enable 200mA 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:0.3 % 輸出端數量: 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 |
| TPS79301DBVRG4Q1 | 功能描述:低壓差穩壓器 - LDO Sgl Output LDO 200mA Adj. 1.2 to 5.5V 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:0.3 % 輸出端數量: 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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