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參數資料
| 型號： | TPS77028DBV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| 中文描述： | 超低功耗50 mA的低壓降線性穩壓器 |
| 文件頁數： | 13/16頁 |
| 文件大小： | 230K |
| 代理商： | TPS77028DBV |
TPS77001, TPS77012, TPS77015, TPS77018, TPS77025
TPS77027, TPS77028, TPS77030, TPS77033, TPS77050
ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS
SLVS210C – JUNE 1999 – REVISED SEPTEMBER 1999
13
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
output voltage programming
The output voltage of the TPS77001 adjustable regulator is programmed using an external resistor divider as
shown in Figure 22. The output voltage is calculated using:
VO
Vref
1
R1
R2
(1)
where
V
ref
= 1.224 V typ (the internal reference voltage)
Resistors R1 and R2 should be chosen for approximately 7-
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
R2 = 169 k
to set the divider current at 7
μ
A and then calculate R1 using:
R1
VO
Vref
1
R2
(2)
VO
VI
OUT
FB
R2
GND
EN
IN
≤
0.9 V
≥
1.7 V
TPS77001
1
μ
F
OUTPUT
VOLTAGE
(V)
R1
R2
2.5
3.3
3.6
4.0
5.0
174
287
324
383
523
169
169
169
169
169
OUTPUT VOLTAGE
PROGRAMMING GUIDE
DIVIDER RESISTANCE
(k
)
1% values shown.
3
1
4
2
R1
5
ESR = 0.2
4.7
μ
F
Figure 22. TPS77001 Adjustable LDO Regulator Programming
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| TPS77025DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77027DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77001DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77012DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
| TPS77015DBV | ULTRA LOW-POWER 50-mA LOW-DROPOUT LINEAR REGULATORS |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS77028DBVR | 功能描述:低壓差穩壓器 - LDO 2.8V 50mA LDO 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:0.3 % 輸出端數量: 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 |
| TPS77028DBVRG4 | 功能描述:低壓差穩壓器 - LDO Ultra Low-Power 50-mA LDO 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:0.3 % 輸出端數量: 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 |
| TPS77028DBVT | 功能描述:低壓差穩壓器 - LDO 2.8V 50mA LDO 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:0.3 % 輸出端數量: 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 |
| TPS77028DBVTG4 | 功能描述:低壓差穩壓器 - LDO Ultra Low-Power 50-mA LDO 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:0.3 % 輸出端數量: 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 |
| TPS77030DBVR | 功能描述:低壓差穩壓器 - LDO 3.0V 50mA LDO 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:0.3 % 輸出端數量: 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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