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參數(shù)資料
| 型號(hào)： | TK71534SCL |
| 廠商： | TOKO INC |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | LOW DROPOUT VOLTAGE REGULATOR |
| 中文描述： | 3.4 V FIXED POSITIVE LDO REGULATOR, 0.28 V DROPOUT, PDSO3 |
| 封裝： | MINIATURE, SOT-23, 3 PIN |
| 文件頁(yè)數(shù)： | 8/13頁(yè) |
| 文件大小： | 76K |
| 代理商： | TK71534SCL |
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Page 8
January 1999 TOKO, Inc.
TK715xx
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (V
OUT
)
The output voltage is specified with V
IN
= (V
OUT(TYP)
+ 1 V)
and I
OUT
= 30 mA.
DROPOUT VOLTAGE (V
DROP
)
The dropout voltage is the difference between the input
voltage and the output voltage at which point the regulator
starts to fall out of regulation. Below this value, the output
voltage will fall as the input voltage is reduced. It is
dependent upon the load current and the junction
temperature.
CONTINUOUS OUTPUT CURRENT (I
OUT
)
Normal operating output current. This is limited by package
power dissipation.
PULSE OUTPUT CURRENT (I
OUT(PULSE)
)
Maximum pulse width 5 ms at V
OUT
above 2.0 V, duty cycle
12.5%: pulse load only.
LINE REGULATION (Line Reg)
Line regulation is the ability of the regulator to maintain a
constant output voltage as the input voltage changes. The
line regulation is specified as the input voltage is changed
from V
IN
= V
OUT(TYP)
+ 1 V to V
IN
= V
OUT(TYP)
+ 6 V or V
IN
=
max 14 V.
LOAD REGULATION (Load Reg)
Load regulation is the ability of the regulator to maintain a
constant output voltage as the load current changes. It is
a pulsed measurement to minimize temperature effects
with the input voltage set to V
IN
= V
OUT(TYP)
+1 V. The load
regulation is specified under two output current step
conditions of 1 mA to 60 mA and 1 mA to 100 mA.
QUIESCENT CURRENT (I
Q
)
The quiescent current is the current which flows through
the ground terminal under no load conditions (I
OUT
= 0 mA).
GROUND CURRENT (I
GND
)
Ground current is the current which flows through the
ground pin(s). It is defined as I
IN
- I
OUT
, excluding control
current.
RIPPLE REJECTION RATIO (RR)
Ripple rejection is the ability of the regulator to attenuate
the ripple content of the input voltage at the output. It is
specified with 200 mVrms, 100 Hz superimposed on the
input voltage, where V
IN
= V
OUT(TYP)
+ 2.0 V. The output
decoupling capacitor is set to 4.7
μ
F and the load current
is set to 5 mA. Ripple rejection is the ratio of the ripple
content of the output vs. the input and is expressed in dB.
REVERSE VOLTAGE PROTECTION
Reverse voltage protection prevents damage due to the
output voltage being higher than the input voltage. This
fault condition can occur when the output capacitor remains
charged and the input is reduced to zero, or when an
external voltage higher than the input voltage is applied to
the output side.
REDUCTION OF OUTPUT NOISE
Although the architecture of the Toko regulators are
designed to minimize semiconductor noise, further
reduction can be achieved by the selection of external
components. The obvious solution is to increase the size
of the output capacitor. Please note that several parameters
are affected by the value of the capacitors and bench
testing is recommended when deviating from standard
values.
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
temperature rise is greatly affected by the mounting pad
configuration 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 recommended mounting pad, the power dissipation of
the SOT-23-3 is increased to 350 mW. For operation at
ambient temperatures over 25
°
C, the power dissipation of
the SOT-23-3 device should be derated at 2.8 mW/
°
C. To
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