參數(shù)資料
型號(hào)： TPS77328DGKRG4
廠商： Texas Instruments, Inc.
英文描述： 250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING
中文描述： 250毫安LDO穩(wěn)壓器有8引腳MSOP封裝
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 347K
代理商： TPS77328DGKRG4
TPS77301/315/316/318/327/328/333/350 WITH RESET OUTPUT
TPS77401
/
415
/
418
/
427
/
428
/
433
/
450 WITH POWER GOOD OUTPUT
250-mA LDO REGULATORS WITH 8-PIN MSOP PACKAGING
SLVS281E
–
FEBRUARY 2000
–
REVISED JULY 2001
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
external capacitor requirements (continued)
Ceramic capacitors have different types of dielectric material with each exhibiting different temperature and
voltage variation. The most common types are X5R, X7R, Y5U, Z5U, and NPO. The NPO type ceramic type
capacitors are generally the most stable over temperature. However, the X5R and X7R are also relatively stable
over temperature (with the X7R being the more stable of the two) and are therefore acceptable to use. The Y5U
and Z5U types provide high capacitance in a small geometry, but exhibit large variations over temperature;
therefore, the Y5U and Z5U are not generally recommended for use on this LDO. Independent of which type
of capacitor is used, one must make certain that at the worst case condition the capacitance/ESR meets the
requirement specified in Figures 18
–
21.
Figure 22 shows the output capacitor and its parasitic impedances in a typical LDO output stage.
–
+
LDO
VI
VESR
IO
RESR
CO
RLOAD
VO
+
–
Figure 22. LDO Output Stage With Parasitic Resistances ESR
In steady state (dc state condition), the load current is supplied by the LDO (solid arrow) and the voltage across
the capacitor is the same as the output voltage (V
Cout
= V
out)
. This means no current is flowing into the C
out
branch. If I
out
suddenly increases (transient condition), the following occurs:
The LDO is not able to supply the sudden current need due to its response time (t
1
in Figure 23). Therefore,
capacitor C
out
provides the current for the new load condition (dashed arrow). C
out
now acts like a battery
with an internal resistance, ESR. Depending on the current demand at the output, a voltage drop will occur
at R
ESR
. This voltage is shown as V
ESR
in Figure 22.
When C
out
is conducting current to the load, initial voltage at the load will be V
out
= V
Cout
–
V
ESR
. Due to
the discharge of C
out
, the output voltage V
out
will drop continuously until the response time t
1
of the LDO
is reached and the LDO will resume supplying the load. From this point, the output voltage starts rising again
until it reaches the regulated voltage. This period is shown as t
2
in Figure 23.
The figure also shows the impact of different ESRs on the output voltage. The left brackets show different levels
of ESRs where number 1 displays the lowest and number 3 displays the highest ESR.
From above, the following conclusions can be drawn:
The higher the ESR, the larger the droop at the beginning of load transient.
The smaller the output capacitor, the faster the discharge time and the bigger the voltage droop during the
LDO response period.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS77333DGK 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77333DGK 制造商:Texas Instruments 功能描述:IC LDO VOLT REG 3.3V 250mA MSOP-8 制造商:Texas Instruments 功能描述:IC, LDO VOLT REG, 3.3V, 250mA, MSOP-8
TPS77333DGKG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77333DGKR 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS77333DGKRG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast Transient Response 250-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(lèi)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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