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UC3836 Datasheet Preview

UC3836 Datasheet

High Efficiency Regulator Controller

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High Efficiency Regulator Controller
UC1835 UC1836
UC2835 UC2836
UC3835 UC3836
FEATURES
Complete Control for a High Current,
Low Dropout, Linear Regulator
Fixed 5V or Adjustable Output Voltage
Accurate 2.5A Current Limiting with
Foldback
Internal Current Sense Resistor
Remote Sense for Improved Load
Regulation
External Shutdown
Under-Voltage Lockout and Reverse
Voltage Protection
Thermal Shutdown Protection
8 Pin Mini-Dip Package
(Surface Mount also Available)
DESCRIPTION
The UC1835/6 families of linear controllers are optimized for the de-
sign of low cost, low dropout, linear regulators. Using an external pass
element, dropout voltages of less than 0.5V are readily obtained.
These devices contain a high gain error amplifier, a 250mA output
driver, and a precision reference. In addition, current sense with fold-
back provides for a 2.5A peak output current dropping to less than
0.5A at short circuit.
These devices are available in fixed, 5V, (UC1835), or adjustable,
(UC1836), versions. In the fixed 5 volt version, the only external parts
required are an external pass element, an output capacitor, and a com-
pensation capacitor. On the adjustable version the output voltage can
be set anywhere from 2.5V to 35V with two external resistors.
Additional features of these devices include under-voltage lockout for
predictable start-up, thermal shutdown and short circuit current limiting
to protect the driver device. On the fixed voltage version, a reverse
voltage comparator minimizes reverse load current in the event of a
negative input to output differential.
BLOCK DIAGRAM
Note: Pin numbers refer to 8-Pin DIL Package
8/94




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UC3836 Datasheet Preview

UC3836 Datasheet

High Efficiency Regulator Controller

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ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Supply Voltage (+VIN) . . . . . . . . . . . . . . . . –1.0V to + 40V
Driver Output Current (Sink or Source) . . . . . . . . . . . . . 600mA
Driver Source to Sink Voltage . . . . . . . . . . . . . . . . . . . . . + 40V
Maximum Current Through Sense Resistor. . . . . . . . . . . . . . 4A
VOUT Sense Input Voltage . . . . . . . . . . . . . . . . . . –.3V to + 40V
Power Dissipation at TA = 25°C (Note 2) . . . . . . . . . . . 1000mW
Power Dissipation at TC = 25°C (Note 2) . . . . . . . . . . . 2000mW
CONNECTION DIAGRAMS
DIL-8, SOIC-8 (TOP VIEW)
N or J Package, D Package
SOIC-16 (TOP VIEW)
DW Package
UC1835 UC1836
UC2835 UC2836
UC3835 UC3836
Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C
Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
Note 1: Voltages are referenced to ground, (Pin 3). Currents are
positive into, negative out of, the specified terminals.
Consult Packaging Section of Databook for thermal
considerations and limitations of packages.
PLCC-20, LCC-20
(TOP VIEW)
Q, L Packages
PACKAGE PIN FUNCTION
FUNCTION
PIN
N/C 1
+VIN
2
+VIN
3
N/C 4
Compensation/
Shutdown
5
N/C 6
Ground
7
N/C 8
N/C 9
Driver Source
10
N/C 11
VOUT Sense
12
N/C 13
N/C 14
Driver Sink
15
N/C 16
Current Limit (-)
17
N/C 18
Sense Resistor Out 19
Sense Resistor Out 20
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, specifications hold for TA = 0°C to + 70°C for the
UC3835/6, –25°C to + 85°C for the UC2835/6, and –55°C to +125°C for the
UC1835/6, +VIN = 6V, Driver Source= 0V, Driver Sink = 5V, TA = TJ.
PARAMETER
TEST CONDITIONS
Input Supply
Supply Current
+VIN = 6V
+VIN = 40V
UVLO Threshold
+VIN Low to High, VOUT Sense = 0V
Threshold Hysteresis
Reverse Current
+VIN = -1.0V, Driver Sink Open
Regulating Voltage and Error Amplifier (UC1835 Family Only)
Regulating Level at VOUT Sense (VREG)
Driver Current = 10mA, TJ = 25°C
Over Temperature
Line Regulation
+VIN = 5.2V + 35V
Load Regulation
Driver Current = 0 to 250mA
Bias Current at VOUT Sense
VOUT Sense = 5.0V
Error Amp Transconductance
±100µA at Compensation/Shutdown Pin
Maximum Compensation Output Current
Sink or Source, Driver Source Open
MIN. TYP. MAX. UNITS
2.75 4.0 mA
3.75 6.0 mA
3.9 4.4 4.9 V
0.1 0.35 V
6.0 20 mA
4.94 5.0 5.06 V
4.9 5.1 V
15 40 mV
6.0 25 mV
75 125 210 µA
0.8 1.3 2.0 mS
90 200 260 µA
2


Part Number UC3836
Description High Efficiency Regulator Controller
Maker Unitrode
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UC3836 Datasheet PDF






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