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參數(shù)資料
| 型號： | TK11900M |
| 廠商： | TOKO INC |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 1.5 V-15 V ADJUSTABLE POSITIVE LDO REGULATOR, 0.35 V DROPOUT, PDSO6 |
| 封裝： | PLASTIC, SOT-23L, 6 PIN |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 73K |
| 代理商： | TK11900M |
Page 6
November 2000 TOKO, Inc.
TK11900
PACKAGE POWER DISSIPATION (P
D
)
This is the power dissipation level at which the thermal
sensor is activated. The IC contains an internal thermal
sensor which monitors the junction temperature. When the
junction temperature exceeds the monitor threshold of
150
°
C, the IC is shut down. The junction temperature rises
as the difference between the input power (V
IN
x I
IN
) and the
output power (V
OUT
x I
OUT
) increases. The rate of tempera-
ture rise is greatly affected by the mounting pad configura-
tion on the PCB, the board material, and the ambient
temperature. When the IC mounting has good thermal
conductivity, the junction temperature will be low even if the
power dissipation is great. When mounted on the recom-
mended mounting pad, the power dissipation of the SOT-
23L is increased to 400 mW. For operation at ambient
temperatures over 25
°
C, the power dissipation of the SOT-
23L device should be derated at 3.2 mW/
°
C. To determine
the power dissipation for shutdown when mounted, attach
the device on the actual PCB and deliberately increase the
output current (or raise the input voltage) until the thermal
protection circuit is activated. Calculate the power dissipa-
tion of the device by subtracting the output power from the
input power. These measurements should allow for the
ambient temperature of the PCB. The value obtained from
P
D
/(150
°
C - T
A
) is the derating factor. The PCB mounting
pad should provide maximum thermal conductivity in order
to maintain low device temperatures. As a general rule, the
lower the temperature, the better the reliability of the device.
The thermal resistance when mounted is expressed as
follows:
T
j
= 0
jA
x P
D
+ T
A
For Toko ICs, the internal limit for junction temperature is
150
°
C. If the ambient temperature (T
A
) is 25
°
C, then:
150
°
C = 0
jA
x P
D
+ 25
°
C
0
jA
= 125
°
C / P
D
P
D
is the value when the thermal sensor is activated. A
simple way to determine P
D
is to calculate V
IN
x I
IN
when the
output side is shorted. Input current gradually falls as
temperature rises. You should use the value when thermal
equilibrium is reached.
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
QUIESCENT CURRENT (I
Q
)
The quiescent current is the current which flows through the
ground terminal under no load (I
OUT
= 0 mA).
GROUND CURRENT (I
GND
)
Ground current is the current which flows through the current
pin(s). It is defined as I
IN
- I
OUT
, excluding control current.
Line Regulation (Line Reg)
Line regulation is the relationship between change in output
voltage due to a change in input voltage.
Load Regulation (Load Reg)
Load regulation is the relationship between change in output
voltage due to a change in load current.
DROP OUT VOLTAGE (V
DROP
)
This is a measure of how well the regulator performs as the
input voltage decreases. The smaller the number, the
further the input voltage can decrease before regulation
problems occur. Nominal output voltage is first measured
when V
IN
= V
OUT(TYP)
+ 1 at a chosen load current. When the
output voltage has dropped 100 mV from the nominal, V
IN
- V
OUT
is the dropout voltage. This voltage is affected by
load current and junction temperature.
OUTPUT NOISE VOLTAGE
This is the effective AC voltage that occurs on the output
voltage under the condition where the input noise is low and
with a given load, filter capacitor, and frequency range.
THERMAL PROTECTION
This is an internal feature which turns the regulator off when
the junction temperature rises above 150
°
C. After the
regulator turns off, the temperature drops and the regulator
output turns back on. Under certain conditions, the output
waveform may appear to be an oscillation as the output
turns off and on and back again in succession.
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