UC1903
UC2903
UC3903
Quad Supply and Line Monitor
FEATURES
∙Inputs for Monitoring up to Four Separate Supply Voltage Levels
∙Internal Inverter for Sensing a Negative Supply Voltage
∙Line/Switch Sense Input for Early Power Source Failure Warning
∙Programmable Underand Over-Voltage Fault Thresholds with Proportional Hysteresis
∙A Precision 2.5V Reference
∙General Purpose Op-Amp for Auxiliary Use
∙Three High Current, >30mA, Open-Collector Outputs Indicate Over-Voltage, Under-Voltage and Power OK Conditions
∙Input Supply Under-Voltage Sensing and Start-Latch Eliminate Erroneous Fault Alerts During Start-Up
∙8-40V Supply Operation with 7mA Stand-By Current
DESCRIPTION
The UC1903 family of quad supply and line monitor integrated circuits will respond to underand over-voltage conditions on up to four continuously monitored voltage levels. An internal op-amp inverter allows at least one of these levels to be negative. A separate line/switcher sense input is available to provide early warning of line or other power source failures.
The fault window adjustment circuit on these devices provides easy programming of underand over-voltage thresholds. The thresholds, centered around a precision 2.5V reference, have an input hysteresis that scales with the window width for precise, glitch-free operation. A reference output pin allows the sense input fault windows to be scaled independently using simple resistive dividers.
The three open collector outputs on these devices will sink in excess of 30mA of load current when active. The underand over-voltage outputs respond after separate, user defined, delays to respective fault conditions. The third output is active during any fault condition including underand over-voltage, line/switcher faults, and input supply under-voltage. The off state of this output indicates a "power OK" situation.
An additional, uncommitted, general purpose op-amp is also included. This op-amp, capable of sourcing 20mA of output current, can be used for a number of auxiliary functions including the sensing and amplification of a feedback error signal when the 2.5V output is used as a system reference.
In addition, these ICs are equipped with a start-latch to prevent erroneous un- der-voltage indications during start-up. These parts operate over an 8V to 40V input supply range and require a typical stand-by current of only 7mA.
BLOCK DIAGRAM
Note: Pin numbers refer to J, N and DW packages.
4/97
ABSOLUTE MAXIMUM RATINGS (Note 1)
Supply Voltage (+VIN). . . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V Open Collector Output Voltages. . . . . . . . . . . . . . . . . . . . . +40V Open Collector Output Currents . . . . . . . . . . . . . . . . . . . . 50mA Sense 1-4 Input Voltages . . . . . . . . . . . . . . . . . . . -0.3V to +20V Line/Switcher Sense Input Voltage . . . . . . . . . . . -0.3V to +40V Op-Amp and Inverter Input Voltages . . . . . . . . . . -0.3V to +40V Op-Amp and Inverter Output Currents . . . . . . . . . . . . . . -40mA Window Adjust Voltage. . . . . . . . . . . . . . . . . . . . . 0.0V to +10V Delay Pin Voltages . . . . . . . . . . . . . . . . . . . . . . . . . 0.0V to +5V Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . -40mA Power Dissipation at TA = 25°C (Note 1) . . . . . . . . . . . 1000mW Power Dissipation at TC = 25°C (Note 1) . . . . . . . . . . . 2000mW Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Lead Temperature (Soldering, 10 Seconds) . . . . . . . . . . 300°C
DIL-18, SOIC-18 (TOP VIEW)
J or N, DW Package
UC1903
UC2903
UC3903
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 limitations and considerations of package.
CONNECTION DIAGRAMS
PLCC-20, LCC-20 |
PACKAGE PIN FUNCTION |
|
(TOP VIEW) |
FUNCTION |
PIN |
Q, L Package |
+VIN |
1 |
|
VREF (2.5V) |
2 |
|
GROUND |
3 |
|
GROUND |
4 |
|
WINDOW ADJUST |
5 |
|
N/C |
6 |
|
SENSE 4 INVERT |
7 |
|
INPUT |
|
|
SENSE 4 |
8 |
|
SENSE 3 |
9 |
|
SENSE 2 |
10 |
|
SENSE 1 |
11 |
|
OV DELAY |
12 |
|
OV FAULT |
13 |
|
UV FAULT |
14 |
|
UV DELAY |
15 |
|
POWER OK |
16 |
|
LINE/SWITCHER |
17 |
|
SENSE |
|
|
G.P. OP-AMP OUT |
18 |
|
G.P. OP-AMP N.I. |
19 |
|
G.P. OP-AMP INV. |
20 |
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +V IN = 15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; VPIN 4 = 1.0V, TA = TJ.
PARAMETERS |
TEST CONDITIONS |
UC1903 / UC2903 |
|
UC3903 |
|
UNITS |
||
|
|
MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
|
Supply |
|
|
|
|
|
|
|
|
Input Supply Current |
No Faults |
|
7 |
9 |
|
7 |
11 |
mA |
|
UV, OV and Line Fault |
|
10 |
15 |
|
10 |
18 |
mA |
Supply Under Voltage |
Fault Outputs Enabled |
6.0 |
7.0 |
7.5 |
5.5 |
7.0 |
8.0 |
V |
Threshold (VSUV) |
|
|
|
|
|
|
|
|
Minimum Supply to Enable |
|
|
3.0 |
4.0 |
|
3.0 |
4.0 |
V |
Power OK Output |
|
|
|
|
|
|
|
|
Reference |
|
|
|
|
|
|
|
|
Output Voltage (VREF) |
TJ = 25°C |
2.485 |
2.5 |
2.515 |
2.470 |
2.5 |
2.530 |
V |
|
Over Temperature |
2.465 |
|
2.535 |
2.465 |
|
2.535 |
V |
Load Regulation |
IL = 0 to 10mA |
|
1 |
10 |
|
1 |
15 |
mV |
Line Regulation |
+VIN = 8 to 40V |
|
1 |
4 |
|
1 |
8 |
mV |
Short Circuit Current |
TJ = 25°C |
|
40 |
|
|
40 |
|
mA |
Fault Thresholds (Note 4) |
|
|
|
|
|
|
|
|
OV Threshold Adj. |
Offset from VREF as a function of VPIN 4 |
.230 |
.25 |
.270 |
.230 |
.25 |
.270 |
V/V |
|
Input = Low to High, 0.5V ≤ VPIN 4 ≤ 2.5V |
|
|
|
|
|
|
|
UV Threshold Adj. |
Offset from VREF as a function of VPIN 4 |
-.270 |
-.25 |
-.230 |
-.270 |
-.25 |
-.230 |
V/V |
|
Input = High to Low, 0.5V ≤ VPIN 4 ≤ 2.5V |
|
|
|
|
|
|
|
2
UC1903
UC2903
UC3903
ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications apply for TA = –55°C to +125°C for the UC1903; –40°C to +85°C for the UC2903; and 0°C to +70°C for the UC3903; +V IN = 15V; Sense Inputs (Pins 6–9 and Pin 15) = 2.5V; VPIN 4 = 1.0V, TA = TJ.
PARAMETERS |
TEST CONDITIONS |
UC1903/UC2903 |
|
UC3903 |
|
UNITS |
||||||
|
|
|
|
|
|
MIN |
TYP |
MAX |
MIN |
TYP |
MAX |
|
Fault Thresholds (cont.) |
|
|
|
|
|
|
|
|
||||
OV & UV Threshold Hyst. |
0.5V ≤ VPIN 4 ≤ 2.5V |
10 |
20 |
30 |
10 |
20 |
30 |
mV/V |
||||
OV & UV Threshold Supply |
+VIN = 8V to 40V |
|
.002 |
.01 |
|
.002 |
.02 |
%/V |
||||
Sensitivity |
|
|
|
|
|
|
|
|
||||
Adjust Pin (Pin 4) |
0.5V ≤ VPIN 4 ≤ 2.5V |
|
±1 |
±10 |
|
±1 |
±12 |
μA/V |
||||
Input Bias Current |
|
|
|
|
|
|
|
|
||||
Line Sense Threshold |
Input = High to Low |
1.94 |
2.0 |
2.06 |
1.9 |
2.0 |
2.1 |
V |
||||
Line Sense Threshold Hyst. |
|
125 |
175 |
225 |
100 |
175 |
250 |
mV |
||||
Sense Inputs |
|
|
|
|
|
|
|
|
||||
Sense 1-4 |
Input = 2.8V (Note 2) |
|
1 |
3 |
|
1 |
6 |
μA |
||||
Input Bias Current |
Input = 2.2 (Note 2) |
|
-1 |
-3 |
|
-1 |
-6 |
μA |
||||
Line Sense Input |
Input = 2.3V (Note 2) |
|
1 |
3 |
|
1 |
6 |
μA |
||||
Bias Current |
|
|
|
|
|
|
|
|
||||
OV and UV Fault Delay |
|
|
|
|
|
|
|
|
||||
Charging Current |
|
|
60 |
|
|
60 |
|
μA |
||||
Threshold Voltage |
Delay Pin = Low to High |
|
1.8 |
|
|
1.8 |
|
V |
||||
Threshold Hysteresis |
TJ = 25°C |
|
250 |
|
|
250 |
|
mV |
||||
Delay |
Ratio of Threshold Voltage to Charging |
20 |
30 |
50 |
20 |
30 |
50 |
ms/μF |
||||
|
|
|
|
|
Current |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|||
Fault Outputs |
(OV, |
|
UV, |
& Power 0K) |
|
|
|
|
|
|
|
|
Maximum Current |
VOUT = 2V |
30 |
70 |
|
30 |
70 |
|
mA |
||||
Saturation Voltage |
IOUT = 12mA |
|
.25 |
.40 |
|
.25 |
.40 |
V |
||||
Leakage Current |
VOUT = 40 V |
|
3 |
25 |
|
3 |
25 |
μA |
||||
Sense 4 Inverter (Note 3) |
|
|
|
|
|
|
|
|
||||
Input Offset Voltage |
|
|
2 |
8 |
|
2 |
10 |
mV |
||||
Input Bias Current |
|
|
.1 |
2 |
|
.1 |
4 |
μA |
||||
Open Loop Gain |
|
65 |
80 |
|
65 |
80 |
|
dB |
||||
PSRR |
+VIN = 8 to 40 V |
65 |
100 |
|
65 |
100 |
|
dB |
||||
Unity Gain Frequency |
|
|
1 |
|
|
1 |
|
MHz |
||||
Slew Rate |
|
|
.4 |
|
|
.4 |
|
V/μs |
||||
Short Circuit Current |
TJ = 25°C |
|
40 |
|
|
40 |
|
mA |
||||
G.P. Op-Amp (Note 3) |
|
|
|
|
|
|
|
|
||||
Input Offset Voltage |
|
|
1 |
5 |
|
1 |
8 |
mV |
||||
Input Bias Voltage |
|
|
.1 |
2 |
|
.1 |
4 |
μA |
||||
Input Offset Current |
|
|
.01 |
.5 |
|
.01 |
1.0 |
μA |
||||
Open Loop Gain |
|
65 |
120 |
|
65 |
120 |
|
dB |
||||
CMRR |
VCM = 0 to +VIN = 2.0V |
65 |
100 |
|
65 |
100 |
|
dB |
||||
PSRR |
+VIN = 8 to 40V |
65 |
100 |
|
65 |
100 |
|
dB |
||||
Unity Gain Frequency |
|
|
1 |
|
|
1 |
|
MHz |
||||
Slew Rate |
|
|
.4 |
|
|
.4 |
|
V/μs |
||||
Short Circuit Current |
TJ = 25°C |
|
40 |
|
|
40 |
|
mA |
||||
Note 2: These currents represent maximum input bias currents required as the sense inputs cross appropriate thresholds. Note 3: When either the G.P. OP-Amp, or the Sense 4 Inverter, are configured for sensing a negative supply voltage, the divider
resistance at the inverting input should be chosen such that the nominal divider current is ≤ 1.4mA. With the divider current at or below this level possible latching of the circuit is avoided. Proper operation for currents at or below 1.4mA is 100% tested in production.
Note 4: Reference to pin numbers in this specification pertain to 18 pin DIL N and J packages and 18 pin SOIC DW package.
3
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