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PDF TK73200 Data sheet ( Hoja de datos )
| Número de pieza | TK73200 | |
| Descripción | ADJUSTABLE LOW DROPOUT REGULATOR | |
| Fabricantes | TOKO | |
| Logotipo |  |
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TK73200
ADJUSTABLE LOW DROPOUT REGULATOR
FEATURES
s Up to 5 A Output Current Capability with External
PNP Transistor
s Internal Short Circuit Protection
s Excellent Load Regulation
s CMOS/TTL-Compatible On/Off Switch
s Internal Reverse Bias Current Protection Switch
s Internal Thermal Shutdown
s Wide Adjustable Output Voltage Range
(2.0 V to 12.0 V)
s Continuous and Pulsed Current Modes
DESCRIPTION
APPLICATIONS
s Battery Powered Systems
s Cellular/Cordless Telephones
s Radio Control Systems
s Wireless Communications Systems
s Portable Instrumentations
s Portable Computers
s Personal Digital Assistants
s Local Area Network (LAN) Receivers
s Power Recovery for Microprocessors
The TK73200 is a controller IC for an adjustable low
dropout voltage regulator. The TK73200 and the external
PNP power transistor provide adjustable output voltages
from 2 to 12 V and output current from 100 mA to 5 A. By
utilizing an external PNP power transistor, low dropout
voltage at high current can be readily achieved. The
internal electronic switch can be controlled by TTL or
CMOS logic levels. The device is in the “on” state when the
control pin is pulled to a high logic level. A pin for a bypass
capacitor, which connects to the internal circuitry, is
provided to lower the overall output noise level.
The current limit characteristics can be configured as
continuous (constant current) or pulsed (cycling). An
internal thermal shutdown circuit limits the junction
temperatures to below 150 °C.
TK73200
CONTROL
NOISE
BYPASS
CPULSE
VIN
BASE
VADJ
GND
IPK
ORDERING INFORMATION
TK73200M L
BLOCK DIAGRAM
VIN IPK
CPULSE
BASE
VADJ
ON/OFF
CIRCUIT
THERMAL
SENSOR
Package Code
Tape/Reel Code
Temp. Code
TAPE/REEL CODE PACKAGE CODE
L: Tape Left
M: SOT23L-8
TEMP. RANGE
C: -30 to 80 °C
CONTROL
BANDGAP
REFERENCE
GND
NOISE BYPASS
June 1999 TOKO, Inc.
Page 1
1 page  
TK73200
TYPICAL PERFORMANCE CHARACTERISTICS (CONT.)
TA = 25 °C, external transistor is 2SB1115(NEC), unless otherwise specified.
CURRENT LIMIT DETECTOR VOLTAGE
VS. INPUT VOLTAGE
CONTINUOUS CURRENT
LIMIT MODE
100
BASE CURRENT DRIVE VS.
INPUT VOLTAGE
100
REVERSE BIAS CURRENT
(VIN = 0 TO 6 V)
1E-6
PULSE CURRENT
LIMIT MODE
1E-9
VIN = 0 V
VIN = 6 V
50
0
50
5 10 15
0
VIN = 4 V
VIN = 2 V
1E-12
5 10 15
0
5
10
VIN (V)
VIN (V)
VREV (V)
QUIESCENT CURRENT VS.
INPUT VOLTAGE (OFF MODE)
1E-6
1E-9
1E-12
0
10
VIN (V)
20
RIPPLE REJECTION
0
-20 CN = NONE
-40 CN = 0.01 µF
-60
CN = 0.1 µF
-80
-100
0.01
0.1 1
10
f (kHz)
100
VIN
73200
VCONT
RCONT
VOUT
CL
CN 4.7 µF
RIPPLE REJECTION CIRCUIT
CONTROL CURRENT VS.
TEMPERATURE
50
40 VCONT = 5 V
30
20
VCONT = 2 V
10
0
-50 0
50 100
TA (°C)
CONTROL VOLTAGE (OUTPUT ON
POINT) VS. TEMPERATURE
2.0 RCONT = 0 Ω
1.0
-50 0
50 100
TA (°C)
OUTPUT VOLTAGE VARIATION VS.
TEMPERATURE
50
30
VOUT TYPICAL
10
-10
-30
-50
-50
0 50
TA (°C)
100
June 1999 TOKO, Inc.
Page 5
5 Page 
TK73200
APPLICATION INFORMATION (CONT.)
EXTERNAL PNP POWER TRANSISTOR
This IC can use any kind of external transistor. The external transistor selection is a function of the load current, Hfe and
power dissipation. See following chart:
LOAD CURRENT
RECOMMENDED EXTERNAL TRANSISTOR
0 ~ 180 mA
2SB624, 2SB1115, 2SB799 (NEC), 2SB970 (Matsushita)
0 ~ 300 mA
2SB1115, 2SB799 (NEC)
0 ~ 500 mA
2SB1114, 2SB1115 (NEC), 2SB1302 (Sanyo), 2SA1203,
2SA1213, 2SA1734 (Toshiba)
0~1A
2SA1242, 2SA1736 (Toshiba), 2SB1302, 2SA1896 (Sanyo)
0~2A
2SA1451, 2SA1242 (Toshiba)
0~3A
2SA1451 (Toshiba), 2SA1645 (NEC)
0~4A
2SA1451 (Toshiba), 2SB904 (Sanyo), 2SA1645 (NEC)
RECOMMENDED RIPK (Ω)
0.33 ~ 0.39
0.22 ~ 0.27
0.12 ~ 0.15
0.056 ~ 0.068
0.033 ~ 0.039
0.022 ~ 0.027
0.012 ~ 0.015
VOLTAGE BACKUP OPERATION (HOLDUP TIME)
PARALLEL ON/OFF CONTROL OPERATION
VOLTAGE
DETECTOR
IC
VIN
73200
VCONT OFF
VOUT
µ PRO
R
2
CL
RESET
R1
VIN
TK73200
TK11230B
R
TK11220B
5V
5A
R
2
R1 3 V
100 mA
2V
100 mA
CL becomes the backup power supply when the
microprocessor is reset with the voltage detector IC
simultaneously with turning OFF the TK73200. CL provides
the holdup time necessary to do an orderly shutdown of the
microprocessor.
ON/OFF
CONTROL
The figure above illustrates multiple regulators being
controlled by a single ON/OFF control signal. The series
resistor R is put in the input line of the low output voltage
regulator in order to prevent overdissipation. The voltage
dropped across the resistor reduces the large input-to-
output voltage across the regulator, reducing the power
dissipation in the device.
June 1999 TOKO, Inc.
Page 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet TK73200.PDF ] | |
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