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| 型號： | LP2950-33LP |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ADJUSTABLE MICROPOWER VOLTAGE REGULATORS WITH SHUTDOWN |
| 中文描述： | 可調(diào)微功耗電壓調(diào)節(jié)器具有關(guān)斷 |
| 文件頁數(shù)： | 17/26頁 |
| 文件大?。?/td> | 2721K |
| 代理商： | LP2950-33LP |
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5 V
1.3 V
Input
Voltage
Output
Voltage
ERROR
4.75 V
Programming Output Voltage (LP2951 Only)
A unique feature of the LP2951 is its ability to output either a fixed voltage or an adjustable voltage, depending
on the external pin connections. To output the internally programmed fixed voltage, tie the SENSE pin to the
OUTPUT pin and the FEEDBACK pin to the V
TAP
pin. Alternatively, a user-programmable voltage ranging from
the internal 1.235-V reference to a 30-V max can be set by using an external resistor divider pair. The resistor
divider is tied to V
OUT
, and the divided-down voltage is tied directly to FEEDBACK for comparison against the
internal 1.235-V reference. To satisfy the steady-state condition in which its two inputs are equal, the error
amplifier drives the output to equal
Equation 2
:
V
OUT
V
REF
1
R1
R2
I
FB
R
1
(2)
LP2950
,
LP2951
ADJUSTABLE MICROPOWER VOLTAGE REGULATORS
WITH SHUTDOWN
SLVS582D–APRIL 2006–REVISED MARCH 2007
APPLICATION INFORMATION (continued)
Figure 1. ERROR Output Timing
Because the ERROR comparator has an open-collector output, an external pullup resistor is required to pull the
output up to V
OUT
or another supply voltage (up to 30 V). The output of the comparator is rated to sink up to
400
μ
A. A suitable range of values for the pullup resistor is from 100 k
to 1 M
. If ERROR is not used, it can
be left open.
Where:
V
REF
= 1.235 V applied across R2
I
FB
= FEEDBACK bias current, typically 20 nA
A minimum regulator output current of 1
μ
A must be maintained. Thus, in an application where a no-load
condition is expected (for example, CMOS circuits in standby), this 1-
μ
A minimum current must be provided by
the resistor pair, effectively imposing a maximum value of R2 = 1.2 M
(1.235 V/1.2 M
≈
1
μ
A).
I
FB
= 20 nA introduces an error of
≈
0.02% in V
OUT
. This can be offset by trimming R1. Alternatively, increasing
the divider current makes I
FB
less significant, thus, reducing its error contribution. For instance, using R2 = 100
k
reduces the error contribution of I
to 0.17% by increasing the divider current to
≈
12
μ
A. This increase in the
divider current still is small compared to the 600-
μ
A typical quiescent current of the LP2951 under no load.
17
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2950-33LPE3 | 功能描述:低壓差穩(wěn)壓器 - LDO Adj Micropwr Vltg Reg 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 |
| LP2950-33LPR | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ADJUSTABLE MICROPOWER VOLTAGE REGULATORS WITH SHUTDOWN |
| LP2950-33LPRE3 | 功能描述:低壓差穩(wěn)壓器 - LDO Adj Micropwr Vltg Reg 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 |
| LP2950-33-S08-B | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:100 mA LOW-DROPOUT VOLTAGE REGULATOR |
| LP2950-33-S08-K | 制造商:UTC-IC 制造商全稱:UTC-IC 功能描述:100 mA LOW-DROPOUT VOLTAGE REGULATOR |
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