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PDF TK73280MILH Data sheet ( Hoja de datos )
| Número de pieza | TK73280MILH | |
| Descripción | LOW DROPOUT REGULATOR | |
| Fabricantes | TOKO | |
| Logotipo |  |
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TK732xx
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 Broad Operating Voltage Range
s High Impedance VSENSE Pin (Off Mode)
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 Lithium Ion Battery Chargers
s Power Recovery for Microprocessors
The TK732xx is a controller IC for a low dropout voltage
regulator. The TK732xx and the external PNP power
transistor provide standard output voltages from 2 to 11 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. In the “off” mode, the output of the
regulator becomes a high impedance. This prevents the
output capacitor from being rapidly discharged for backup
to the load.
ORDERING INFORMATION
TK732 M L
Voltage Code
Package Code
Grade
Tape/Reel Code
Temp. Code
VOLTAGE CODE
20 = 2.0 V *
32 = 3.2 V
21 = 2.1 V *
33 = 3.3 V
22 = 2.2 V *
34 = 3.4 V
23 = 2.3 V *
35 = 3.5 V
24 = 2.4 V
36 = 3.6 V
25 = 2.5 V
37 = 3.7 V
26 = 2.6 V
38 = 3.8 V
27 = 2.7 V
39 = 3.9 V
28 = 2.8 V
40 = 4.0 V
29 = 2.9 V
41 = 4.1 V
30 = 3.0 V
42 = 4.2 V
31 = 3.1 V
43 = 4.3 V
44 = 4.4 V
45 = 4.5 V
46 = 4.6 V
47 = 4.7 V
48 = 4.8 V
49 = 4.9 V
50 = 5.0 V
55 = 5.5 V *
70 = 7.0 V *
80 = 8.0 V
11 = 11.0 V
TAPE/REEL CODE PACKAGE CODE
L: Tape Left
M: SOT-23L-8
TEMP. RANGE
C: -30 to 80 C **
I : -40 to 85 C
GRADE
None: Standard 2%
H: High (Special) ***
* Unavailable with I Rank
** unless Otherwise Specified
*** TK73241MCLH, TK73242MCLH Available Only
January 1999 TOKO, Inc.
TK732xx
CONTROL
NOISE
BYPASS
01S
CPULSE
VIN
BASE
VSENSE
GND
IPK
CONTROL
BLOCK DIAGRAM
VIN IPK
CPULSE
BASE
VSENSE
ON/OFF
CIRCUIT
THERMAL
SENSOR
BANDGAP
REFERENCE
LEAKAGE
PROTECTION
GND
NOISE BYPASS
Page 1
1 page  
TK732xx
TK73241MCLH, TK73242MCLH ELECTRICAL CHARACTERISTICS CONT.
Note 1: Power dissipation is 600 mW when mounted as recommended. Derate at 4.8 mW/°C for operation above 25 °C.
Note 2: Refer to “Definition of Terms.”
Note 3: Ripple rejection and noise voltage are affected by the value and characteristics of the capacitor used.
Note 4: This pin is used for Pulse Current Limit Mode. When selecting Continuous Current Limit Mode, this pin is connected to GND.
Note 5: Not applicable for VOUT > 4.8 V.
Note 6: The voltage applied to any pin must be greater than -0.4 V.
Gen. Note: Parameters with min. or max. values are 100% tested at TA = 25 °C.
TK73241MCLH, TK73242MCLH ELECTRICAL CHARACTERISTICS TABLE 2
Test Conditions: VIN = VOUT(TYP) + 1 V, IOUT = 30 mA, TA = 25 °C, unless otherwise specified.
Output Voltage
Voltage Code
Room Temp. Range (TA = 25 °C)
VOUT(MIN)
VOUT(MAX)
Full Temp. Range (TA = -10 to +60 °C)
VOUT(MIN)
VOUT(MAX)
4.1 V
4.2 V
41
4.067 V
4.133 V
4.050 V
4.150 V
42
4.167 V
4.233 V
4.150 V
4.250 V
January 1999 TOKO, Inc.
Page 5
5 Page 
TK732xx
DEFINITIONS AND TERMS (CONT.)
APPLICATION INFORMATION
3) Plot PD1 against 25 °C
4) Connect PD1 to the point corresponding to the 150 °C
with a straight line.
5) In design, take a vertical line from the maximum
operating temperature (e.g., 75 °C) to the derating
curve.
6) Read off the value of PD against the point at which the
vertical line intersects the derating curve. This is taken
as the maximum power dissipation, DPD.
The maximum operating current is:
IOUT = (DPD / (VIN(MAX) - VOUT)
750
600
MOUNTED AS
SHOWN
450
FREE AIR
300
INPUT-OUTPUT CAPACITORS
The output capacitor is necessary for stable operation.
The regulator may oscillate if the output capacitor is too
small or missing. The output capacitor size is determined
by load, transient response and external transistor used.
Evaluation in the circuit is recommended to ensure
performance requirements are satisfied. A minimum of 4.7
µF is necessary for stability, with twice that value
recommended. The minimum recommended input
capacitor is 1 µF. Problems do not occur with larger values
of capacitance. However, extremely low ESR may result in
unstable operation. Thus, the use of large value ceramic
capacitors is not recommended on the output.
BOARD LAYOUT
GND
150
0
0
50 100
TA (°C)
150
CONTROL
VIN
VOUT
GND
RIPK
SOT-23L-8 POWER DISSIPATION CURVE
SOT-23L-8 BOARD LAYOUT
January 1999 TOKO, Inc.
Page 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TK73280MILH.PDF ] | |
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