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參數(shù)資料
| 型號： | MAX667ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | +5V/Programmable Low-Dropout Voltage Regulator |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.35 V DROPOUT, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 78K |
| 代理商： | MAX667ESA |
PNP transistor is turned on fully as regulation is lost.
Even with a load current of a few microamperes, the
base current will be driven above 5mA. Figure 8 shows
how this base current may be significant.
Consequently, a mostly discharged battery can be fur-
ther discharged at end-of-life.
Figure 6 shows how this condition can be modified by
connecting DD to SHDN with a 47k
resistor, R1, par-
alleled with a 0.1μF capacitor to GND. This modifica-
tion reduces the no-load quiescent current to
approximately 160μA when dropout is reached (Figure
9), but increases the dropout voltage by about 0.1V.
The output voltage drops to approximately 3V once DD
begins to activate SHDN, but it does not fall to zero
because SHDN is only partially activated.
A second alternate connection (Figure 7) further
reduces quiescent current near the dropout voltage,
compared to the circuit in Figure 6. The output must be
set with external resistors (R1, R2), so DD lowers the
output voltage as the input voltage falls by sourcing
current into SET via R3. Quiescent current remains low
for inputs down to 3.5V, and peaks before falling to 0
at low input voltages. Although the current peak is
higher than with the connection in Figure 6, this may
be more useful because the quiescent current peaks
at an input voltage well below the useful range of most
batteries (Figure 9). Also, as IN falls below 5V, OUT
tracks IN minus the dropout voltage. This connection
still allows separate use of the SHDN input.
Power Dissipation
The MAX667 can regulate currents as high as 250mA
and withstand input-output differential voltages as high
as 15.2V, but not simultaneously. The maximum power
dissipation is dependent on the package and the tem-
perature (see Absolute Maximum Ratings). Figure 10
shows the maximum output current at various input-
output differential voltages for the plastic DIP and SO
packages. The MAX667 can withstand short-circuit
loads up to 1 second.
Operation from AC S ourc es
The MAX667 is a micropower CMOS regulator intend-
ed principally for battery operation. When operating
from AC sources, consider power-supply ripple rejec-
tion. The MAX667’s error amplifier produces very low
gain bandwidth, and the input power-supply rejection
Voltage Regulator
_______________________________________________________________________________________
7
M
+5V /Programmable Low-Dropout
VIN (V)
I
μ
A
800
0
1
2
4
6
200
600
3
5
400
M
CIRCUIT OF
FIGURE 7
CIRCUIT OF
FIGURE 6
Figure 9. Quiescent Current Below Dropout with Connections
of Figures 6 and 7
VIN-VOUT (V)
L
400
0
0
15
100
300
200
10
5
GUARANTEED 250mA
DIP PACKAGE
DISSIPATION LIMIT
SO PACKAGE
DISSIPATION LIMIT
T
A
= +50
C
M
Figure 10. MAX667 Load Current vs. Input-Output Differential
Voltage
Figure 11. Output Response to +4V/100
μ
s Input Step
+10V
1ms/div
+6V
INPUT
+2V/div
+5V OUTPUT
+0.2V/div
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX667ESA+ | 功能描述:低壓差穩(wěn)壓器 - LDO 5V Programmable Voltage Regulator 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 |
| MAX667ESA+T | 功能描述:低壓差穩(wěn)壓器 - LDO 5V Programmable Voltage Regulator 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 |
| MAX667ESA-T | 功能描述:低壓差穩(wěn)壓器 - LDO 5V Programmable Voltage Regulator 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 |
| MAX667MJA | 功能描述:低壓差穩(wěn)壓器 - 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(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 |
| MAX667MJA/883B | 功能描述:低壓差穩(wěn)壓器 - LDO 5V Programmable Voltage Regulator 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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