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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

N/C 1

+VIN

N/C 4

Compensation/

Shutdown

N/C 6

Ground

N/C 8

N/C 9

Driver Source

N/C 11

VOUT Sense

N/C 13

N/C 14

Driver Sink

N/C 16

Current Limit (-)

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

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UC3836 Datasheet

High Efficiency Regulator Controller

UC3836 Datasheet

High Efficiency Regulator Controller

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