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UC1832/3
UC2832/3
UC3832/3
Precision Low Dropout Linear Controllers
FEATURES
•
•
•
•
•
•
Precision 1% Reference
Over-Current Sense Threshold
Accurate to 5%
Programmable Duty-Ratio
Over-Current Protection
4.5V to 36V Operation
100mA Output Drive, Source or
Sink
Under-Voltage Lockout
DESCRIPTION
The UC1832 and UC1833 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 UC1833 family includes the basic functions of this design in a low-cost, 8-
pin mini-dip package, while the UC1832 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); industrial (–25°C to 85°C), order UC2832/3
(N or J); and military (–55°C to 125°C), order UC1832/3J. Surface mount
packaging is also available.
Additional Features of the UC1832
series:
•
•
•
•
•
Adjustable Current Limit to
Current Sense Ratio
Separate +V
IN
terminal
Programmable Driver Current
Limit
Access to V
REF
and E/A(+)
Logic-Level Disable Input
BLOCK DIAGRAMS
UDG-92040
6/94
UC1832/3
UC2832/3
UC3832/3
ABSOLUTE MAXIMUM RATINGS
Supply Voltage +V
IN
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 +V
IN
Operating Junction Temperature (note 2) . . . –55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
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
UC1832
DIL-14 (Top View)
J Or N Package
DIL-8 (Top View)
J Or N Package
UC1833
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
+V
IN
Comp/Shutdown
E/A(+)
+2V REF
N/C
Gnd
Logic Disable
Limit
Source
N/C
E/A(-)
Sink
V
ADJ
N/C
Timer RC
Current Sense(-)
Current Sense(+)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15-17
18
19
20
LCC-20 & PLCC-20
L & Q Package
(Top View)
PACKAGE PIN FUNCTION
FUNCTION
PIN
+V
IN
& C/S(+)
N/C
N/C
N/C
Comp/Shutdown
Gnd
N/C
N/C
N/C
Source
N/C
E/A(-)
N/C
N/C
Sink
Timer RC
Current Sense(+)
N/C
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18-20
2
UC1832/3
UC2832/3
UC3832/3
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, specifications hold for T
A
= 0°C to 70°C for the
UC3832/3, –25°C to 85°C for the UC2832/3, and –55°C to 125°C for the
UC1832/3, +V
IN
= 15V, Driver sink = +V
IN
, C/S(+) voltage = +V
IN.
T
A
=T
J
.
TEST CONDITIONS
+V
IN
= 6V
+V
IN
= 36V
Logic Disable = 2V (UCx832 only)
Reference Section
Output Voltage (Note 3)
Load Regulation (UCx832 only)
Line Regulation
Under-Voltage Lockout Threshold
Logic Disable Input (UCx832 only)
Threshold Voltage
Input Bias Current
Current Sense Section
Comparator Offset
Over Temperature
Amplifier Offset (UCx833 only)
Amplifier Offset (UCx832 only)
V
ADJ
= Open
V
ADJ
= 1V
V
ADJ
= 0V
Input Bias Current
Input Offset Current (UCx832 only)
Amplifier CMRR (UCx832 only)
Transconductance
V
ADJ
Input Current (UCx832 only)
Timer
Inactive Leakage Current
Active Pullup Current
Duty Ratio (note 4)
Period (notes 4,5)
Upper Trip Threshold (Vu)
Lower Trip Threshold (Vl)
Trip Threshold Ratio
Error Amplifier
Input Offset Voltage (UCx832 only)
Input Bias Current
Input Offset Current (UCx832 only)
AVOL
CMRR (UCx832 only)
PSRR (UCx832 only)
Transconductance
VOH
VOL
IOH
V
CM
= V
COMP
= 2V
V
CM
= V
COMP
= 2V
V
CM
= V
COMP
= 2V
V
COMP
= 1V to 13V
V
CM
= 0V to +V
IN
- 3V
V
CM
= 2V, +V
IN
= 4.5 to 36V
I
COMP
=
±
10µA
I
COMP
= 0, Volts below +V
IN
I
COMP
= 0
V
COMP
= 2V
-700
-8.0
-4.5
-1.5
50
60
70
80
90
4.3
.95
.45
-500
1.3
0.7
-100
-1.1
1.5
8.0
mV
µA
µA
dB
dB
dB
mS
V
V
µA
Vu/Vl
C/S(+) = C/S(-) = +V
IN
; TRC pin = 2V
C/S(+) = +V
IN
, C/S(-) = +V
IN
- 0.4V; TRC pin = 0V
ontime/period, R
T
= 200k, C
T
= 0.27µF
ontime + offtime, R
T
= 200k, C
T
= 0.27µF
-345
0.25
-270
4.8
36
1.8
0.9
2.0
1.0
-175
µA
µA
%
ms
V
V
V/V
V
CM
= +V
IN
V
CM
= +V
IN
V
CM
= 4.1V to +V
IN
+0.3V
I
COMP
=
±
100µA
V
ADJ
= 0V
-10
95
93
110
110
180
250
65
-10
80
65
-1
100
100
135
135
235
305
100
105
107
170
170
290
360
135
10
mV
mV
mV
mV
mV
mV
µA
µA
dB
mS
µA
Logic Disable = 0V
1.3
-5.0
1.4
-1.0
1.5
V
µA
T
J
= 25°C, I
DRIVER
= 10mA
over temperature, I
DRIVER
= 10mA
I
OUT
= 0 to 10mA
+V
IN
= 4.5 to 36V, I
DRIVER
= 10mA
1.98
1.96
-10
2.00
2.00
-5.0
0.033
3.6
2.02
2.04
0.5
4.5
V
V
mV
mV/V
V
MIN
TYP
6.5
9.5
3.3
MAX
10
15
UNITS
mA
mA
mA
PARAMETER
Input Supply
Supply Current
3
UC1832/3
UC2832/3
UC3832/3
Unless otherwise stated, specifications hold for T
A
= 0°C to 70°C for the UC3832/3, –25°C to
ELECTRICAL
CHARACTERISTICS (cont.)
85°C for the UC2832/3, and –55°C to 125°C for the UC1832/3, +V
IN
= 15V, Driver sink =
+V
IN
, C/S(+) voltage = +V
IN
. T
A
=T
J
.
PARAMETER
Error Amplifier (cont.)
IOL
Driver
Maximum Current
Limiting Voltage (UCx832 only)
Internal Current Sense Resistance
Pull-Up Current at Driver Sink
Driver Limit & Source pins common; T
J
= 25°C
Over Temperature
Driver Limit to Source voltage at current limit,
I
SOURCE
= -10mA; T
J
= 25°C (Note 6)
T
J
= 25°C (Note 6)
Compensation/Shutdown = 0.4V; Driver Sink = +V
IN
- 1V
Compensation/Shutdown = 0.4V, +V
IN
= 36V; Driver
Sink = 35V
Pull-Down Current at Driver Source
Saturation Voltage Sink to Source
Maximum Source Voltage
UVLO Sink Leakage
Maximum Reverse Source Voltage
Thermal Shutdown
Compensation/Shutdown = 0.4V; Driver Source = 1V
Driver Source = 0V; Driver Current = 100mA
Driver Sink = +V
IN
, Driver Current = 100mA
Volts below +V
IN
+V
IN
= C/S(+) = C/S(-) = 2.5V, Driver Sink = 15V, Driver
Source = 0V, TA = 25°C
Compensation/Shutdown = 0V; I
SOURCE
= 100µA,
+V
IN
= 3V
25
1.6
160
µA
V
°C
3.0
V
-1000
150
-300
300
1.5
-75
700
µA
µA
V
-800
.72
2.4
-300
-100
V
Ω
µA
200
100
300
300
400
450
mA
mA
V
COMP
= 2V, C/S(-) = +V
IN
V
COMP
= 2V, C/S(-) = +V
IN
- 0.4V
100
2
500
6
700
µA
mA
TEST CONDITIONS
MIN
TYP
MAX
UNITS
Note 3: On the UCx833 this voltage is defined as the regulating level at the error amplifier inverting input, with the error amplifier
driving V
SOURCE
to 2V.
Note 4: These parameters are first-order supply-independent, however both may vary with supply for +V
IN
less than about 4V. This
supply variation will cause a slight change in the timer period and duty cycle, although a high off-time/on-time ratio will be main-
tained.
Note 5: With recommended R
T
value of 200k, T
OFF
≈
R
T
C
T
* ln(Vu/Vl)
±
10%.
Note 6: The internal current limiting voltage has a temperature dependence of approximately -2.0mV/°C, or -2800ppm/°C. The inter-
nal 2.4
Ω
sense resistor has a temperature dependance of approximately +1500ppm/°C.
APPLICATION AND OPERATION INFORMATION
NPN Pass (Local 100mA Regulator) (UCx833)
UDG-92041-1
4
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