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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)： | 10/14頁 |
| 文件大小： | 267K |
| 代理商： | TPS79350 |
TPS79301, TPS79318, TPS79325
TPS79328, TPS793285, TPS79330
TPS79333, TPS793475
SLVS348C
–
JULY 2001
–
REVISED APRIL 2002
10
www.ti.com
APPLICATION INFORMATION
board layout recommendation to improve PSRR and noise performance
To improve ac measurements like PSRR, output noise, and transient response, it is recommended that the
board be designed with separate ground planes for V
IN
and V
OUT
, with each ground plane connected only at
the GND pin of the device. In addition, the ground connection for the bypass capacitor should connect directly
to the GND pin of the device.
power dissipation and junction temperature
Specified regulator operation is assured to a junction temperature of 125
°
C; the maximum junction temperature
should be restricted to 125
°
C under normal operating conditions. This restriction limits the power dissipation
the regulator can handle in any given application. To ensure the junction temperature is within acceptable limits,
calculate the maximum allowable dissipation, P
D(max)
, and the actual dissipation, P
D
, which must be less than
or equal to P
D(max)
.
The maximum-power-dissipation limit is determined using the following equation:
PD(max)
TJmax
TA
R
θ
JA
Where:
T
J
max
is the maximum allowable junction temperature.
R
θ
JA
is the thermal resistance junction-to-ambient for the package, see the dissipation rating table.
T
A
is the ambient temperature.
(1)
The regulator dissipation is calculated using:
PD
VI
VO
IO
(2)
Power dissipation resulting from quiescent current is negligible. Excessive power dissipation triggers the
thermal protection circuit.
programming the TPS79301 adjustable LDO regulator
The output voltage of the TPS79301 adjustable regulator is programmed using an external resistor divider as
shown in Figure 23. The output voltage is calculated using:
VO
Vref
1
R1
R2
(3)
Where:
V
ref
= 1.2246 V typ (the internal reference voltage)
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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 負載調節(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 |
| 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 負載調節(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 |
| 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 負載調節(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 |
| 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 負載調節(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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