2

UC1853

UC2853

UC3853

ABSOLUTE MAXIMUM RATINGS

Supply Voltage (VCC) .............................40V

Output Drive Current,

Continuous ................................ 0.125A

Peak ....................................... 0.5A

Output Minimum Voltage ......................... –0.3V

IAC Maximum Input Current ........................1mA

IMO Maximum Output Current ..................... –2mA

IMO Minimum Voltage ........................... –0.3V

FB Maximum Input Voltage ..........................5V

VCOMP Maximum Voltage......................... 6.2V

ICOMP Sourcing Current .................... Self-Limiting

ICOMP Sinking Current .......................... 20mA

ICOMP Maximum Voltage ......................... 7.2V

Storage Temperature ................... –65°C to +150°C

Junction Temperature ................... –55°C to +150°C

Lead Temperature (Soldering, 10 sec.) ............. +300°C

All voltages with respect to GND. Currents are positive into,

negative out of the specified terminal. Consult Packaging Section

of Databook for thermal limitations and considerations of

packages.

ELECTRICAL CHARACTERISTICS

UC1853; –25°C to +85°C for the 2853; and 0°C to +70°C for the UC3853; VCC =

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Undervoltage Lockout Section

VCC Turn-on Threshold

11.5

13

V

Hysteresis

1.5

1.8

2.1

V

Supply Current Section

250

500

mA

IAC=0

10

15

mA

Voltage Loop Error Amplifier Section

Transconductance

IOUT=±20

µA 0-70C

300

450

575

µmho

Temperature

135

640

µmho

Input Voltage

0-70C

2.925

3

3.075

V

Temperature

2.9

3.1

V

AVOL

50

60

dB

Output Sink Current

20

50

µA

Output Source Current

–50

–20

µA

Output Voltage High

5.5

6

V

Output Voltage Low

0.6

0.9

V

Current Loop Error Amplifier Section

Offset Voltage

06

mV

Voltage Gain

70

dB

Sink Current

1

mA

Source Current

–150

–80

mA

Output High

6

6.8

V

Output Low

mA

0.3

0.8

V

PWM Modulator Gain

20

%/V

CONNECTION DIAGRAM

DIL-8, SOIC-8 (Top View)

JorN, D Package