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參數資料
| 型號： | TPS7301Q |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION |
| 中文描述： | 低技術，集成延遲復位功能降穩壓器 |
| 文件頁數： | 38/43頁 |
| 文件大小： | 638K |
| 代理商： | TPS7301Q |
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TPS7301Q, TPS7325Q, TPS7330Q, TPS7333Q, TPS7348Q, TPS7350Q
LOW-DROPOUT VOLTAGE REGULATORS
WITH INTEGRATED DELAYED RESET FUNCTION
SLVS124F – JUNE 1995 – REVISED JANUARY 1999
38
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
Resistors R1 and R2 should be chosen for approximately 7-
μ
A divider current. A recommended value for R2
is 169 k
with R1 adjusted for the desired output voltage. Smaller resistors can be used, but offer no inherent
advantage and consume more power. Larger values of R1 and R2 should be avoided as leakage currents at
FB will introduce an error. Solving for R1 yields a more useful equation for choosing the appropriate resistance:
R1
VO
Vref
1
R2
OUTPUT
VOLTAGE
2.5 V
3.3 V
3.6 V
4 V
5 V
6.4 V
R1
R2
UNIT
191
309
348
402
549
750
169
169
169
169
169
169
k
k
k
k
k
k
OUTPUT VOLTAGE
PROGRAMMING GUIDE
VO
RESET
OUT
FB
R1
R2
GND
EN
IN
<0.5 V
>2.7 V
TPS7301
To System
Reset
0.1
μ
F
250 k
+
VI
CSR = 1
10
μ
F
Figure 48. TPS7301 Adjustable LDO Regulator Programming
undervoltage supervisor function
The RESET output of the TPS73xx initiates a reset in microcomputer and microprocessor systems in the event
of an undervoltage condition. An internal comparator in the TPS73xx monitors the output voltage of the regulator
to detect the undervoltage condition. When that occurs, the RESET output transistor turns on taking the RESET
signal low.
On power up, the output voltage tracks the input voltage. The RESET output becomes active (low) as V
I
approaches the minimum required for a valid RESET signal (specified at 1.5 V for 25
°
C and 1.9 V over full
recommended operating temperature range). When the output voltage reaches the appropriate positive-going
input threshold (V
IT+
), a 200-ms (typical) timeout period begins during which the RESET output remains low.
Once the timeout has expired, the RESET output becomes inactive. Since the RESET output is an open-drain
NMOS, a pullup resistor should be used to ensure that a logic-high signal is indicated.
The supply-voltage-supervisor function is also activated during power-down. As the input voltage decays and
after the dropout voltage is reached, the output voltage tracks linearly with the decaying input voltage. When
the output voltage drops below the specified negative-going input threshold (V
IT–
— see electrical
characteristics tables), the RESET output becomes active (low). It is important to note that if the input voltage
decays below the minimum required for a valid RESET, the RESET is undefined.
Since the circuit is monitoring the regulator output voltage, the RESET output can also be triggered by disabling
the regulator or by any fault condition that causes the output to drop below V
IT–
. Examples of fault conditions
include a short circuit on the output and a low input voltage. Once the output voltage is reestablished, either by
reenabling the regulator or removing the fault condition, then the internal timer is initiated, which holds the
RESET signal active during the 200-ms (typical) timeout period.
相關PDF資料 |
PDF描述 |
|---|---|
| TPS7330Q | LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION |
| TPS7330Y | LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION |
| TPS7333Q | LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION |
| TPS7348Q | LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION |
| TPS7333Y | LOW-DROPOUT VOLTAGE REGULATORS WITH INTEGRATED DELAYED RESET FUNCTION |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS7301QD | 功能描述:低壓差穩壓器 - LDO Lowest Dropout PMOS 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 |
| TPS7301QDG4 | 功能描述:低壓差穩壓器 - LDO Lowest Dropout PMOS 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 |
| TPS7301QDR | 功能描述:低壓差穩壓器 - LDO Lowest Dropout PMOS 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 |
| TPS7301QDRG4 | 功能描述:低壓差穩壓器 - LDO Lowest Dropout PMOS 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 |
| TPS7301QP | 功能描述:低壓差穩壓器 - LDO Lowest Dropout PMOS 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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