TK732XX Datasheet, PDF (1/16 Pages) TOKO, Inc – LOW DROPOUT REGULATOR

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 V_SENSE 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
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