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UC3832 Datasheet Preview

UC3832 Datasheet

Precision Low Dropout Linear Controllers

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Precision Low Dropout Linear Controllers
UC1832
UC2832/3
UC3832/3
FEATURES
Precision 1% Reference
Over-Current Sense Threshold
Accurate to 5%
Programmable Duty-Ratio
Over-Current Protection
4.5 V to 36 V Operation
100mA Output Drive, Source, or
Sink
Under-Voltage Lockout
Additional Features of the UC2832
series:
Adjustable Current Limit to
Current Sense Ratio
Separate +VIN terminal
Programmable Driver Current
Limit
Access to VREF and E/A(+)
Logic-Level Disable Input
DESCRIPTION
The UC2832 and UC3833 series of precision linear regulators include all the
control functions required in the design of very low dropout linear regulators.
Additionally, they feature an innovative duty-ratio current limiting technique
which provides peak load capability while limiting the average power dissipa-
tion of the external pass transistor during fault conditions. When the load cur-
rent reaches an accurately programmed threshold, a gated-astable timer is
enabled, which switches the regulator’s pass device off and on at an externally
programmable duty-ratio. During the on-time of the pass element, the output
current is limited to a value slightly higher than the trip threshold of the duty-ra-
tio timer. The constant-current-limit is programmable on the UCx832 to allow
higher peak current during the on-time of the pass device. With duty-ratio con-
trol, high initial load demands and short circuit protection may both be accom-
modated without extra heat sinking or foldback current limiting. Additionally, if
the timer pin is grounded, the duty-ratio timer is disabled, and the IC operates
in constant-voltage/constant-current regulating mode.
These IC’s include a 2 Volt (±1%) reference, error amplifier, UVLO, and a high
current driver that has both source and sink outputs, allowing the use of either
NPN or PNP external pass transistors. Safe operation is assured by the inclu-
sion of under-voltage lockout (UVLO) and thermal shutdown.
The UC3833 family includes the basic functions of this design in a low-cost, 8-
pin mini-dip package, while the UC2832 series provides added versatility with
the availability of 14 pins. Packaging options include plastic (N suffix), or ce-
ramic (J suffix). Specified operating temperature ranges are: commercial (0°C
to 70°C), order UC3832/3 (N or J); and industrial (–40°C to 85°C), order
UC2832/3 (N or J). Surface mount packaging is also available.
BLOCK DIAGRAMS
SLUS387A - JUNE 1994 - REVISED - MAY 2003
UDG-92040




Unitrode

UC3832 Datasheet Preview

UC3832 Datasheet

Precision Low Dropout Linear Controllers

No Preview Available !

ABSOLUTE MAXIMUM RATINGS
Supply Voltage +VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
Driver Output Current (Sink or Source) . . . . . . . . . . . . . 450mA
Driver Sink to Source Voltage . . . . . . . . . . . . . . . . . . . . . . . 40V
TRC Pin Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to 3.2V
Other Input Voltages. . . . . . . . . . . . . . . . . . . . . . . –0.3V to +VIN
Operating Junction Temperature (note 2) . . . –55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
UC1832
UC2832/3
UC3832/3
Note 1: Unless otherwise indicated, voltages are referenced to
ground and currents are positive into, negative out of, the speci-
fied terminals.
Note 2: See Unitrode Integrated Circuits databook for
information regarding thermal specifications and limitations of
packages.
CONNECTION DIAGRAMS
UC2832
DIL-14 (Top View)
J Or N Package
DIL-8 (Top View)
J Or N Package
UC3833
SOIC-16 (Top View)
DW Package
SOIC-16 (Top View)
DW Package
LCC-20 & PLCC-20
L & Q Package
(Top View)
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C 1
+VIN
2
Comp/Shutdown 3
E/A(+)
4
+2V REF
5
N/C 6
Gnd 7
Logic Disable
8
Limit
9
Source
10
N/C 11
E/A(-)
12
Sink 13
VADJ
14
N/C 15-17
Timer RC
18
Current Sense(-) 19
Current Sense(+) 20
LCC-20 & PLCC-20
L & Q Package
(Top View)
2
PACKAGE PIN FUNCTION
FUNCTION
PIN
+VIN & C/S(+)
1
N/C 2
N/C 3
N/C 4
Comp/Shutdown 5
Gnd 6
N/C 7
N/C 8
N/C 9
Source
10
N/C 11
E/A(-)
12
N/C 13
N/C 14
Sink 15
Timer RC
16
Current Sense(+) 17
N/C 18-20


Part Number UC3832
Description Precision Low Dropout Linear Controllers
Maker Unitrode
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UC3832 Datasheet PDF






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