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TK70403 Datasheet(PDF) 6 Page - TOKO, Inc

Part # TK70403
Description  1.03 V REGULATOR WITH ON/OFF SWITCH
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Manufacturer  TOKO [TOKO, Inc]
Direct Link  http://www.toko.com
Logo TOKO - TOKO, Inc

TK70403 Datasheet(HTML) 6 Page - TOKO, Inc

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Page 6
January 1999 TOKO, Inc.
TK70403
DEFINITION AND EXPLANATION OF TECHNICAL TERMS
OUTPUT VOLTAGE (V
OUT)
The output voltage is specified with V
IN = VOUT(TYP) + 0.4
and I
OUT = 2 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 value is reduced. It is dependent
upon the load current and the temperature.
OUTPUT CURRENT (I
OUT(MAX))
The rated output current is specified under the condition
where the output voltage drops 0.4 V when the output
current is loaded. The input voltage is set to V
OUT + 0.4 V.
LINE REGULATION (Line Reg)
Line regulation is the ability of the regulator to maintain a
constant output voltage as the input voltage changes. The
voltage is pulsed to minimize temperature effects.
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
pulsed to minimize temperature effects. The load regulation
is specified to 0.1 mA to 5.0 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 - IOUT, excluding control
current.
RIPPLE REJECTION (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 50 mVp-p, 400 Hz, I
OUT = 2 mA superimposed
on the input voltage, where V
IN = VOUT(TYP) + 0.4 V. The
ripple rejection is the ratio of the output vs. input and is
expressed in dB.
ON/OFF CONTROL
High is “on” (referenced to ground). When the on/off
function is not used, connect the control terminal to V
IN.
The control current can be reduced by inserting a series
resistor (R
CONT) between the control terminal and VIN.
Changes in the on/off level, due to this connection, are
shown below.
ON/OFF RESPONSE WITH CONTROL (SPEED)
The turn-on time depends upon the value of the output
capacitor and the noise bypass capacitor. The turn-on time
will decrease with smaller value of either capacitor. The
graph below shows the relationship between turn-on time
and load capacitance. However, when the capacitance is
small, load transient and line transient will worsen and the
noise will increase. C
L = 0.68 µF, CN = 1000 pF will be the
best for fastest operation.
VCONT (V)
2
0
1
2
1
0
VOUT = 1 M
RCONT = 820 k
VOUT = 680 k
RISE TIME (µs)
.1 µ
0
100
1000
.01 µ
0
CL = 2.2 µF
1000 pF
100 pF
10 pF
CL = 0.45 µF
CL = 4.7 µF
CL = 0.68 µF


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