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參數(shù)資料
| 型號： | LT1528CQ |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | FIXED/ADJUSTABLE POSITIVE LDO REGULATOR, 0.85 V DROPOUT, PSSO5 |
| 封裝： | PLASTIC, D2PAK-5 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大小： | 248K |
| 代理商： | LT1528CQ |
9
LT1528
The maximum junction temperature will be equal to the
maximum junction temperature rise above ambient plus
the maximum ambient temperature or:
T
JMAX
= 50
°
C + 31.4
°
C = 81.4
°
C
Output Capacitance and Transient Performance
The LT1528 is designed to be stable with a wide range of
output capacitors. The minimum recommended value is
3.3
μ
F with an ESR of 2
or less. The LT1528 output
transient response will be a function of output capaci-
tance. See the Transient Response curves in the Typical
Performance Characteristics. Larger values of output ca-
pacitance will decrease the peak deviations and provide
improved output transient response for larger load tran-
sients. Bypass capacitors, used to decouple individual
components powered by the LT1528, will increase the
effective value of the output capacitor.
Microprocessor Applications
The LT1528 has been optimized for microprocessor
applications, with the fastest transient response of current
PNP low dropout regulators. In order to deal with the large
load transients associated with current generation
microprocessors, output capacitance must be increased.
To meet worst-case voltage specifications for many popular
processors, four 47
μ
F solid tantalum surface mount
capacitors are recommended for decoupling at the
microprocessor. These capacitors should have an ESR of
approximately 0.1
to 0.2
to minimize transient response
under worst-case load deltas. The Typical Application
shows connections needed to supply power for several
different processors. This application allows the output
voltage to be jumper selectable.
Protection Features
The LT1528 incorporates several protection features, such
as current limiting and thermal limiting, in addition to the
normal protection features associated with monolithic
regulators. The device is protected against reverse input
voltages and reverse voltages from output to input.
Current limit protection and thermal overload protection
are intended to protect the device against overload condi-
tions. For normal operation the junction temperatures
should not exceed 125
°
C.
The input of the device will withstand reverse voltages of
15V. Current flow into the device will be limited to less than
1mA (typically less than 100
μ
A) and no negative voltage
will appear at the output. The device will protect both itself
and the load.
The Sense pin is internally clamped to one diode drop
below ground. If the Sense pin is pulled below ground, with
the input open or grounded, current must be limited to less
than 5mA.
Several different input/output conditions can occur in
regulator circuits. The output voltage may be held up while
the input is either pulled to ground, pulled to some inter-
mediate voltage or is left open circuit. Current flow back
into the output will vary depending on the conditions.
Many circuits incorporate some form of power manage-
ment. The following information summarized in Table 2
will help optimize power usage.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Table 2. Fault Conditions
INPUT PIN
< V
OUT
(Nominal)
SHDN PIN
Open (High)
OUTPUT/SENSE PINS
Forced to V
OUT
(Nominal)
RESULTING CONDITIONS
Reverse Output Current
≈
150
μ
A (See Figure 3)
Input Current
≈
1
μ
A (See Figure 4)
Reverse Output Current
≈
150
μ
A (See Figure 3)
Input Current
≈
1
μ
A (See Figure 4)
Reverse Output Current
≈
150
μ
A (See Figure 3)
Reverse Output Current
≈
150
μ
A (See Figure 3)
Output Current = 0
Output Current = 0
Output Current = Short-Circuit Current
Output Current = 0
< V
OUT
(Nominal)
Grounded
Forced to V
OUT
(Nominal)
Open
Open
≤
0.8V
≤
0.8V
> 1.5V
Open (High)
Grounded
Open (High)
Grounded
Open (High)
Grounded
> 1V
> 1V
≤
0V
≤
0V
≤
0V
≤
0V
–15V < V
IN
< 15V
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