Datasheet
3
UC1901
UC2901
UC3901
ELECTRICAL CHARACTERISTICS
Unless otherwise stated, these specifications apply for V
IN
= 10V, R
T
= 10kΩ, C
T
=
820pF, T
A
= T
J
.
PARAMETER TEST CONDITIONS UC1901/UC2901 UC3901 UNITS
MIN TYP MAX MIN TYP MAX
Reference Section
Output Voltage T
J
= 25°C 1.485 1.5 1.515 1.47 1.5 1.53 V
T
MIN
≤ T
J
≤ T
MAX
1.470 1.5 1.530 1.455 1.5 1.545
Line Regulation V
IN
= 4.5 to 35V 2 10 2 15 mV
Load Regulation I
OUT
= 0 to 5mA 4 10 4 15 mV
Short Circuit Current T
J
= 25°C –35 –55 –35 –55 mV
Error Amplifier Section (To Compensation Terminal)
Input Offset Voltage V
CM
= 1.5V 1 4 1 8 mV
Input Bias Current V
CM
= 1.5V –1 –3 –1 –6 µA
Input Offset Current V
CM
= 1.5V 0.1 1 0.1 2 µA
Small Signal Open Loop Gain 40 60 40 60 dB
CMRR V
CM
= 0.5 to 7.5V 60 80 60 80 dB
PSRR V
IN
= 5 to 25V 80 100 80 100 dB
Output Swing, ∆ V
O 0.4 0.7 0.4 0.7 V
Maximum Sink Current 90 150 90 150 µA
Maximum Source Current –2 –3 –2 –3 mA
Gain Band Width Product 1 1 MHz
Slew Rate 0.3 0.3 V/µS
Modulators/Drivers Section (From Compensation Terminal)
Voltage Gain 11 12 13 10 12 14 dB
Output Swing
±
1.6
±
2.8
±
1.6
±
2.8 V
Driver Sink Current 500 700 500 700 µA
Driver Source Current –15 –35 –15 –35 mA
Gain Band Width Product 25 25 MHz
Oscillator Section
Initial Accuracy T
J
= 25°C 140 150 160 130 150 170 kHz
T
MIN
≤ T
J
≤ T
MAX
130 170 120 180 kHz
Line Sensitivity V
IN
= 5 to 35V .15 .35 .15 .60 %/V
Maximum Frequency R
T
= 10k, C
T
= 10pF 5 5 MHz
Ext. Clock Low Threshold Pin 1 (C
T
) = V
IN
0.5 0.5 V
Ext. Clock High Threshold Pin 1 (C
T
) = V
IN
1.6 1.6 V
Status Indicator Section
Input Voltage Window @ E/A Inputs, V
CM
= 1.5V
±
135
±
150
±
165
±
130
±
150
±
170 mV
Saturation Voltage E/A ∆ Input = 0V, I
SINK
= 1.6mA 0.45 0.45 V
Max. Output Current Pin 13 = 3V, E/A ∆ Input = 0.0V 8 15 8 15 mA
Leakage Current Pin 13 = 40V, E/A ∆Input = 0.2V .05 1 .05 5 µA
Supply Current V
IN
= 35V 5 8 5 10 mA
UVLO Section
Drivers Enabled Threshold At Input Supply V
IN
3.9 4.5 3.9 4.5 V
Status Output Enabled
Threshold
At Input Supply V
IN
3.9 4.5 3.9 4.5 V
Change in Reference Output When V
IN
Reaches UVLO
Threshold
–2 –30 –2 –30 mV