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參數(shù)資料
| 型號(hào)： | TPS775XX |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | FAST-TRANSIENT-RESPONSE 500mA LOW-DROPOUT VOLTAGE REGULATORS |
| 中文描述： | 快速瞬態(tài)響應(yīng)500mA的低壓差電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 14/28頁 |
| 文件大?。?/td> | 791K |
| 代理商： | TPS775XX |
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Programming the TPS77x01 Adjustable LDO Regulator
The output voltage of the TPS77x01 adjustable regulator is programmed using an external resistor divider as
shown in
Figure 25
. The output voltage is calculated using
Equation 1
:
V
= V
x (1 + )
OUT
ref
R
R
2
(1)
V
V
OUT
ref
1) x R
-
2
R = (
(2)
IN
EN
GND
FB/NC
OUT
RESET/
PG
RESET or PG Output
V
OUT
V
IN
0.1 F
m
250k
W
TPS77x01
C
OUT
R
1
R
2
> 1.7V
< 0.9V
OUTPUT VOLTAGE
PROGRAMMING GUIDE
R
1
R
2
UNIT
OUTPUT
VOLTAGE
2.5V
3.3V
3.6V
4.75V
121
196
226
332
110
110
110
110
k
W
k
W
k
W
k
W
Reset Indicator
The TPS775xx features a RESET output that can be used to monitor the status of the regulator. The internal
comparator monitors the output voltage: when the output drops to between 92% and 98% of its nominal
regulated value, the RESET output transistor turns on, taking the signal low. The open-drain output requires a
pullup resistor. If not used, it can be left floating. RESET can be used to drive power-on reset circuitry or as a
low-battery indicator. RESET does not assert itself when the regulated output voltage falls outside the specified
2% tolerance, but instead reports an output voltage low relative to its nominal regulated value (refer to
Timing
Diagram
for start-up sequence).
Power-Good Indicator
The TPS776xx features a power-good (PG) output that can be used to monitor the status of the regulator. The
internal comparator monitors the output voltage: when the output drops to between 92% and 98% of its nominal
regulated value, the PG output transistor turns on, taking the signal low. The open-drain output requires a pullup
resistor. If not used, it can be left floating. PG can be used to drive power-on reset circuitry or used as a
low-battery indicator.
TPS775xx, TPS776xx
SLVS232I–SEPTEMBER 1999–REVISED AUGUST 2007
APPLICATION INFORMATION (continued)
Where:
V
ref
= 1.1834V typ (the internal reference voltage)
Resistors R
1
and R
2
should be chosen for approximately 10
μ
A divider current. Lower value resistors can be
used, but 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 R
2
= 110k
to set the divider current at approximately 10
μ
A and then calculate R
1
using
Equation 2
:
Figure 25. TPS77x01 Adjustable LDO Regulator Programming
14
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| TPS77601D | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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 |
| TPS77601DG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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 |
| TPS77601DR | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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 |
| TPS77601DRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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 |
| TPS77601PWP | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Res 500-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 |
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