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參數(shù)資料
| 型號： | TPS72501D |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | LOW INPUT VOLTAGE, 1-A LOW-DROPOUT LINEAR REGULATORS WITH SUPERVISOR |
| 中文描述： | 低輸入電壓，1低壓差線性穩(wěn)壓器與督導(dǎo)員 |
| 文件頁數(shù)： | 9/22頁 |
| 文件大?。?/td> | 698K |
| 代理商： | TPS72501D |
www.ti.com
APPLICATION INFORMATION
External Capacitor Requirements
A 1-μF or larger ceramic input bypass capacitor, connected between IN and GND and located close to the
TPS725xx, is required for stability. To improve transient response, noise rejection, and ripple rejection, an
additional 10-μF or larger, low ESR capacitor is recommended. A higher-value, low ESR input capacitor may be
necessary if large, fast-rise-time load transients are anticipated and the device is located several inches from the
power source, especially if the minimum input voltage of 1.8 V is used.
Programming the TPS72501 Adjustable LDO Regulator
The output voltage of the TPS72501 adjustable regulator is programmed using an external resistor divider as
shown in Figure 19. The output voltage is calculated using:
VO
Vref
1
R1
R2
(1)
R1
VO
Vref
1
R2
(2)
V
O
V
I
OUT
FB
R1
R2
GND
EN
IN
TPS72501
1
μ
F
C
o
OUTPUT VOLTAGE
PROGRAMMING GUIDE
(Standard 1% Resistor Values)
PROGRAM
VOLTAGE
R1 (K
)
R2 (k
)
1.8 V
2.5 V
3.3 V
3.6 V
ACTUAL
VOLTAGE
56.2
127
196
205
118
121
115
105
1.801
2.500
3.299
3.602
1.22 V
≤
0.4 V
≥
1.3 V
TPS72501
TPS72515, TPS72516
TPS72518, TPS72525
SLVS341D–MAY 2002–REVISED MARCH 2004
The TPS725xx family of low-dropout (LDO) regulators has numerous features that make it applicable to a wide
range of applications. The family operates with very low input voltage (
≥
1.8 V) and low dropout voltage (typically
200 mV at full load), making it an efficient stand-alone power supply or post regulator for battery or switch mode
power supplies. Both the active low RESET and 1-A output current make the TPS725xx family ideal for powering
processor and FPGA supplies. The TPS725xx family also has low output noise (typically 150 μV
RMS
with 10-μF
output capacitor), making it ideal for use in telecom equipment.
Although an output capacitor is not required for stability, transient response and output noise are improved with a
10-μF output capacitor.
Where:
V
FB
= V
REF
= 1.22 V typical (see the electrical characteristics for V
REF
range)
Resistors R1 and R2 should be chosen for approximately 10-μA divider current. Lower value resistors offer no
inherent advantage and waste more power. Higher values should be avoided as leakage currents at FB increase
the output voltage error. The recommended design procedure is to choose R2 = 120 k
to set the divider current
at 10 μA and then calculate R1 using:
Figure 19. TPS72501 Adjustable LDO Regulator Programming
9
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS72501DCQ | 功能描述:低壓差穩(wěn)壓器 - LDO Low Input Voltage Any Cap 1-A 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 |
| TPS72501DCQ | 制造商:Texas Instruments 功能描述:V REG LDO SMD 72501 SOT-223-6 |
| TPS72501DCQG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Low Input Voltage Any Cap 1-A 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 |
| TPS72501DCQR | 功能描述:低壓差穩(wěn)壓器 - LDO Low Input Voltage Any Cap 1-A 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 |
| TPS72501DCQR | 制造商:Texas Instruments 功能描述:IC 制造商:Texas Instruments 功能描述:IC, ADJ LDO REG, 1.22V TO 5.5V, SOT223-6 |
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