TK70403MTB/03J Просмотр технического описания (PDF) - Toko America Inc

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TK70403MTB/03J

1.03 V REGULATOR WITH ON/OFF SWITCH

Toko America Inc  

TK70403

DEFINITION AND EXPLANATION OF TECHNICAL TERMS

OUTPUT VOLTAGE (VOUT)

The output voltage is specified with VIN = VOUT(TYP) + 0.4

and IOUT = 2 mA.

DROPOUT VOLTAGE (VDROP)

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.

ON/OFF CONTROL

High is “on” (referenced to ground). When the on/off

function is not used, connect the control terminal to VIN.

The control current can be reduced by inserting a series

resistor (RCONT) between the control terminal and VIN.

Changes in the on/off level, due to this connection, are

shown below.

2

VOUT = 1 M

OUTPUT CURRENT (IOUT(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 VOUT + 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 (IQ)

The quiescent current is the current which flows through

the ground terminal under no load conditions (IOUT = 0 mA).

GROUND CURRENT (IGND)

Ground current is the current which flows through the

ground pin(s). It is defined as IIN - 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, IOUT = 2 mA superimposed

on the input voltage, where VIN = VOUT(TYP) + 0.4 V. The

ripple rejection is the ratio of the output vs. input and is

expressed in dB.

VOUT = 680 k

1

RCONT = 820 k

0

0

1

2

VCONT (V)

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. CL = 0.68 µF, CN = 1000 pF will be the

best for fastest operation.

.1 µ

.01 µ

CL = 0.45 µF

CL = 0.68 µF

1000 pF

100 pF

CL = 2.2 µF

10 pF

CL = 4.7 µF

0

0

100

1000

RISE TIME (µs)

Page 6

January 1999 TOKO, Inc.

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