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參數(shù)資料
| 型號： | TPS79350 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ULTRALOW-NOISE, HIGH PSRR, FAST RF 200-mA LOW-DROPOUT LINEAR REGULATORS(超低噪聲,200mA低壓差線性穩(wěn)壓器) |
| 中文描述： | 超低噪聲，高PSRR，快速射頻200毫安低壓差線性穩(wěn)壓器（超低噪聲，200mA的低壓差線性穩(wěn)壓器） |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 267K |
| 代理商： | TPS79350 |
TPS79301, TPS79318, TPS79325
TPS79328, TPS793285, TPS79330
TPS79333, TPS793475
SLVS348C
–
JULY 2001
–
REVISED APRIL 2002
11
www.ti.com
APPLICATION INFORMATION
programming the TPS79301 adjustable LDO regulator (continued)
Resistors R1 and R2 should be chosen for approximately 50-
μ
A divider current. Lower value resistors can be
used for improved noise performance, but the solution consumes more power. Higher resistor values should
be avoided as leakage current into/out of FB across R1/R2 creates an offset voltage that artificially
increases/decreases the feedback voltage and thus erroneously decreases/increases V
O
. The recommended
design procedure is to choose R2 = 30.1 k
to set the divider current at 50
μ
A, C1 = 15 pF for stability, and then
calculate R1 using:
R1
VO
Vref
1
R2
(4)
In order to improve the stability of the adjustable version, it is suggested that a small compensation capacitor
be placed between OUT and FB. For voltages <1.8 V, the value of this capacitor should be 100 pF. For voltages
>1.8 V, the approximate value of this capacitor can be calculated as:
(3 x 10
–
7
) x (R1
R2)
(R1 x R2)
C1
(5)
The suggested value of this capacitor for several resistor ratios is shown in the table below. If this capacitor is
not used (such as in a unity-gain configuration) or if an output voltage <1.8 V is chosen, then the minimum
recommended output capacitor is 4.7
μ
F instead of 2.2
μ
F.
TPS79301
22 pF
15 pF
15 pF
OUTPUT VOLTAGE
PROGRAMMING GUIDE
OUTPUT
VOLTAGE
2.5 V
3.3 V
3.6 V
R1
R2
C1
33.4 k
53.6 k
59 k
30.1 k
30.1 k
30.1 k
VO
VI
OUT
FB
R1
R2
GND
EN
IN
≤
0.7 V
≥
2 V
1
μ
F
BYPASS
0.01
μ
F
1
μ
F
C1
Figure 23. TPS79301 Adjustable LDO Regulator Programming
regulator protection
The TPS793xx PMOS-pass transistor has a built-in back diode that conducts reverse current when the input
voltage drops below the output voltage (e.g., during power down). Current is conducted from the output to the
input and is not internally limited. If extended reverse voltage operation is anticipated, external limiting might
be appropriate.
The TPS793xx features internal current limiting and thermal protection. During normal operation, the TPS793xx
limits output current to approximately 400 mA. When current limiting engages, the output voltage scales back
linearly until the overcurrent condition ends. While current limiting is designed to prevent gross device failure,
care should be taken not to exceed the power dissipation ratings of the package or the absolute maximum
voltage ratings of the device. If the temperature of the device exceeds approximately 165
°
C, thermal-protection
circuitry shuts it down. Once the device has cooled down to below approximately 140
°
C, regulator operation
resumes.
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| TPS79401DCQ | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 250-mA 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(fù)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 |
| TPS79401DCQ | 制造商:Texas Instruments 功能描述:IC V REG LDO ADJ 250MA SOT223-6 |
| TPS79401DCQG4 | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 250-mA 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(fù)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 |
| TPS79401DCQR | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 250-mA 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(fù)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 |
| TPS79401DCQRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO High PSRR Fast RF High-Enable 250-mA 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(fù)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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