UC1846/7
UC2846/7
UC3846/7
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (Pin 15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Collector Supply Voltage (Pin 13) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V
Output Current, Source or Sink (Pins 11, 14) . . . . . . . . . . . . . . . . . . . . . . . 500mA
Analog Inputs (Pins 3, 4, 5, 6, 16). . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to +VIN
Reference Output Current (Pin 2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -30mA
Sync Output Current (Pin 10). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5mA
Error Amplifier Output Current (Pin 7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -5mA
Soft Start Sink Current (Pin 1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA
Oscillator Charging Current (Pin 9) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5mA
Power Dissipation at TA=25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000mW
Power Dissipation at TC=25°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2000mW
Storage Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65°C to +150°C
Lead Temperature (soldering, 10 seconds) . . . . . . . . . . . . . . . . . . . . . . . . +300°C
Note 1. All voltages are with respect to Ground, Pin 13. Currents are positive into,
negative out of the speficied terminal. Consult Packaging Section of Databook for
thermal limitations and considerations of packages. Pin numbers refer to DIL and
SOIC packages only.
CONNECTION DIAGRAMS
DIL-16, SOIC-16
PLCC-20, LCC-20
(TOP VIEW)
Q, L Packages
PACKAGE PIN FUNCTION
(TOP VIEW)
FUNCTION
PIN
J or N Package, DW Package
N/C
1
C/L SS
VREF
C/S-
C/S+
N/C
2
3
4
5
6
E/A+
E/A-
Comp
CT
N/C
RT
Sync
A Out
Gnd
N/C
VC
7
8
9
10
11
12
13
14
15
16
17
18
19
20
B Out
VIN
Shutdown
(Unless otherwise stated, these specifications apply for TA=-55°C to +125°C for
UC1846/7; -40°C to +85°C for the UC2846/7; and 0°C to +70°C for the UC3846/7;
VIN=15V, RT=10k, CT=4.7nF, TA=TJ.)
ELECTRICAL CHARACTERISTICS
UC1846/UC1847
UC3846/UC3847
PARAMETER
TEST CONDITIONS
UC2846/UC2847
MIN. TYP. MAX. MIN. TYP. MAX. UNITS
Reference Section
Output Voltage
TJ=25°C, IO=1mA
5.05
5.10
5
5.15
20
5.00
5.10
5
5.20
20
V
mV
mV
mV/°C
V
Line Regulation
VIN=8V to 40V
Load Regulation
IL=1mA to 10mA
3
15
3
15
Temperature Stability
Total Output Variation
Output Noise Voltage
Long Term Stability
Over Operating Range, (Note 2)
Line, Load, and Temperature (Note 2)
10Hz ≤ f ≤10kHz, TJ=25°C (Note 2)
TJ=125°C, 1000 Hrs. (Note 2)
0.4
0.4
5.00
-10
5.20
4.95
-10
5.25
100
5
100
5
µV
mV
mA
Short Circuit Output Current VREF=0V
-45
-45
2
TI [ TEXAS INSTRUMENTS ]
