- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄385948 > TPS79350 (Texas Instruments, Inc.) 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) PDF資料下載
參數(shù)資料
| 型號(hào)： | 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)： | 9/14頁 |
| 文件大?。?/td> | 267K |
| 代理商： | TPS79350 |
TPS79301, TPS79318, TPS79325
TPS79328, TPS793285, TPS79330
TPS79333, TPS793475
SLVS348C
–
JULY 2001
–
REVISED APRIL 2002
9
www.ti.com
APPLICATION INFORMATION
The TPS793xx family of low-dropout (LDO) regulators has been optimized for use in noise-sensitive
battery-operated equipment. The device features extremely low dropout voltages, high PSRR, ultralow output
noise, low quiescent current (170
μ
A typically), and enable-input to reduce supply currents to less than 1
μ
A
when the regulator is turned off.
A typical application circuit is shown in Figure 22.
0.1
μ
F
BYPASS
OUT
1
3
IN
EN
GND
2
4
5
VI
VO
2.2
μ
F
+
TPS793xx
0.01
μ
F
Figure 22. Typical Application Circuit
external capacitor requirements
A 0.1-
μ
F or larger ceramic input bypass capacitor, connected between IN and GND and located close to the
TPS793xx, is required for stability and will improve transient response, noise rejection, and ripple rejection. A
higher-value electrolytic 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.
Like all low dropout regulators, the TPS793xx requires an output capacitor connected between OUT and GND
to stabilize the internal control loop. The minimum recommended capacitance is 2.2
μ
F. Any 2.2
μ
F or larger
ceramic capacitor is suitable, provided the capacitance does not vary significantly over temperature.
The internal voltage reference is a key source of noise in an LDO regulator. The TPS793xx has a BYPASS pin
which is connected to the voltage reference through a 250-k
internal resistor. The 250-k
internal resistor,
in conjunction with an external bypass capacitor connected to the BYPASS pin, creates a low pass filter to
reduce the voltage reference noise and, therefore, the noise at the regulator output. In order for the regulator
to operate properly, the current flow out of the BYPASS pin must be at a minimum, because any leakage current
will create an IR drop across the internal resistor thus creating an output error. Therefore, the bypass capacitor
must have minimal leakage current.
For example, the TPS79328 exhibits only 32
μ
V
RMS
of output voltage noise using a 0.1-
μ
F ceramic bypass
capacitor and a 2.2-
μ
F ceramic output capacitor. Note that the output starts up slower as the bypass capacitance
increases due to the RC time constant at the BYPASS pin that is created by the internal 250-k
resistor and
external capacitor.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS79428DGNR | ULTRALOW-NOISE, HIGH PSRR, FAST RF 250-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS816 | LEAD FREE PRODUCT PHOTO-ELECTRIC SWITCHES |
| TPS816F | LEAD FREE PRODUCT PHOTO-ELECTRIC SWITCHES |
| TPS842A | TPS842A |
| TPS844 | TPS842A |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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(dòng)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(dòng)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(dòng)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(dòng)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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。