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PDF TK71433S Data sheet ( Hoja de datos )
| Número de pieza | TK71433S | |
| Descripción | LDO Regulator | |
| Fabricantes | TOKO | |
| Logotipo |  |
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TK714xxS
LDO Regulator with base terminal for Current Boost
TK714xxS
1. DESCRIPTION
The TK714xxS is a low dropout linear regulator with
internal PNP pass transistor that can supply 100mA load
current. The phase compensation in the IC has been
optimized that the output capacitor can be omitted.
The TK714xxS is provided with the On/Off control
function and also with the base terminal for the external
transistor that 1A low dropout regulator can be easily
composed by connecting external transistor (Hfe around
100).
2. FEATURES
An external transistor can be used.
(Base current Typ10mA)
On/Off control available (High ON).
No input current at Off mode
Excellent output stability (CL 0.022µF,Iout 2mA)
High ripple rejection (-70dB at 1kHz)
100mA load current guarantee
Output voltage available from 1.3 to 5.0V (0.1V step).
3. APPLICATIONS
Electronic Equipment
Battery Powered Systems
Mobile communications, etc.
4. PIN CONFIGURATION
Vin 1
GND 2
Vcont 3
5
4
Vout
Base
5. BLOCK DIAGRAM
Vin 1
GND 2
Vcont 3
SW Control
Circuit
Bandgap
Reference
Error Amp
Over Current
Limit
Over Heat
Protection
5 Vout
4 BASE
GC3-H028A
Page 2
1 page  
Input/Output capacitors (CL)
Linear regulators require input and output capacitors in
order to maintain the regulator’s loop stability. The
equivalent series resistance(ESR) of the output capacitor
must be in the stable operation area. However, it is
recommended to use as large a value of capacitance as is
practical. The output noise and the ripple noise decrease
as the capacitance value increases. The IC is never
damaged by enlarging the capacitance.
ESR values vary widely between ceramic and tantalum
capacitors, However, tantalum capacitors are assumed to
provide more ESR damping resistance, which provides
greater circuits stability. This implies that a higher level
of circuit stability can be obtained by using tantalum
capacitors when compared to ceramic capacitors with
similar values. The IC provides stable operation with an
output side capacitor CL of 0.1µF(Iout 2mA). If the
capacitor is 0.1µF or more over the full range of
temperature, either a ceramic capacitor or tantalum
capacitor can be used without concerning the ESR.
A recommended value of the application is as follows.
Vout 1.3V Iout 0mA
CL 0.1µF(Tantalum)
or CL 1.0µF(MLCC)
Vout 1.3V Iout 2mA
CL 0.1µF any Type
Vout 3.0V Iout 0mA
CL 0.1µF any Type
The input capacitor is necessary when the battery is
discharged, the power supply impedance increases, or the
line distance to the power supply is long. This capacitor
might be necessary on each individual IC even if two or
more regulator ICs are used. It is not possible to
determine this indiscriminately. Please confirm the
stability while mounted.
Generally, Multi layer ceramic capacitor (MLCC) has the
temperature characteristic and the voltage characteristic.
Please select parts in consideration of the voltage and the
temperature used.
TK714xxS
Stability area graph (Vout=1.3~5.0V)
Condition Vin=VoutTyp+1V Cin=0.1µF(MLCC)
CL=0.022µF(MLCC)
100
S table area
10
1
Unstable area
0.1
0.01
0
20 40 60 80 100
Iout (mA)
CL=1.0µF(MLCC)
100
S table area
10
1
0.1
0.01
0
20 40 60 80 100
Iout (mA)
CL=0.1µF(Tantalum)
100
S table area
10
1
0.1
0.01
0
20 40 60 80 100
Iout (mA)
GC3-H028A
Page 6
5 Page 
ON/OFF Transient
Vin=4.0V Iout=5mA Cin=0.1µF
Vcont
CL=0
Vout
CL=0.1µF(MLCC)
TK714xxS
Vcont
Vout
CL=0
CL=0.1µF(MLCC)
Vcont
Vout
CL=1.0µF(MLCC)
CL=2.2µF(MLCC)
Vout
Vcont
CL=1.0µF(MLCC)
CL=2.2µF(MLCC)
GC3-H028A
Page 12
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet TK71433S.PDF ] | |
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