UC1904 UC2904 UC3904 Precision Quad Supply and Line Monitor FEATURES DESCRIPTION • Inputs for Monitoring Up to Four Supply Voltages • Two Inputs Preset for -5V and -12V Monitoring, or Programmable Positive Levels • The UC1904 Quad Supply Monitor will respond to under- and over-voltage conditions on up to four continuously monitored voltage levels. Four independent positive voltages can be monitored or, alternatively, two of the sense inputs are preset to monitor -5V and -12V supplies. The device also monitors Over-Current and Line Sense inputs, both with precision input thresholds. Precision 2.5V Reference • Separate Inputs for Over-Current and Line Fault Sensing • Adjustable Under- to Over-Voltage Fault Windows • Latched Over-Voltage and Over-Current Output • Power Good and Power Warning Outputs • Auto Restart Function with ON/OFF Control, and Programmable Delay • Programmable Pwr On Reset Delay BLOCK DIAGRAM Four open collector outputs on the UC1904 give the following responses: 1. The OV/OC output is a latched over-voltage, or over-current response. 2. A Power Good signal responds low with any fault detection – on power-up a programmable delay is used to hold this output low for a system Power On Reset signal. 3. The PWRW output responds only to a Line Sense input, for early warning of power failures. 4. The last open collector, the ON/OFF output, generates a delayed supply OFF control signal in response to an OFF input command, under-voltage condition, or line fault detection. The OV-UV fault window is adjustable with a programming input. The thresholds are centered around the precision 2.5V reference, with a scaled hysteresis for precise, glitch free operation. In the positive mode of operation, the fault windows at each of the sense inputs can be independently scaled using external resistors and the 2.5V reference output. An Auto Restart function couples with the under-voltage and line sensing circuits to allow controlled power supply start-up and shutdown. This device will operate over a supply range of 4.75V to 18V. The device is available in a DIP, SOIC, or PLCC outline. This device is ESD protected on all pins. Note: Pin Numbers refer to J, N, and DW Packages. 4/97 Powered by ICminer.com Electronic-Library Service CopyRight 2003 UC1904 UC2904 UC3904 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Sense Inputs, S1 And S2, Other Analog And Logic Inputs Maximum Forced Voltage . . . . . . . . . . . . . . . . . . -0.3V to 10V Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±10mA Sense Input S3, (-12V Sense Input) Maximum Forced Voltage . . . . . . . . . . . . . . . . . . -18V to 10V Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±10mA Sense Input S4, (-5V Sense Input) Maximum Forced Voltage . . . . . . . . . . . . . . . . . . -10V to 10V Maximum Forced Current . . . . . . . . . . . . . . . . . . . . . . ±10mA Open Collector Outputs Maximum Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20V Maximum Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50mA Reference Output Current . . . . . . . . . . . . . . . Internally Limited Operating Junction Temperature . . . . . . . . . . . -55°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . . . -65°C to +150°C Note 1: Unless otherwise indicated, voltages are reference to ground and currents are positive into, negative out of, the specified terminals. CONNECTION DIAGRAMS PLCC-20 (TOP VIEW) Q PACKAGE PACKAGE PIN FUNCTION FUNCTION PIN 2.5V POR DLY N.C. S1 S2 S3 S4 N.C. LS Input OC Input PWRW Out PG Out OV/OC Out VIN ON/OFF Out OFF DLY ON/OFF Input ARST Input WADJ Gnd DIL-18, SOIC-18 (TOP VIEW) J or N PACKAGE, DW PACKAGE 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 ELECTRICAL CHARACTERISTICS: Unless otherwise stated, these specifications hold for TA = 0 to 70°C for the UC3904, -40 to +85°C for the UC2904, and -55 to +125°C for the UC1904, +VIN = 15V, WADJ = 0.5V, Sense Inputs 1-4, OC and LS Inputs = 2.5V. The ON/OFF Input and the ARST Input = 0V. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS mA Input Supply VIN Supply Current VIN = 15V 3.2 4.5 VIN UVLO Threshold Low to High 4.5 4.75 V UVLO Threshold Hysteresis 50 mV Minimum VIN to Enable PG Out 0.8 1.5 V 2.5 Reference Output Voltage(VREF) TJ = 25°C 2.475 2.525 V Over Temperature, UC3904 2.47 2.53 V Over Temperature, UC2904 & UC1904 2.465 2.535 V 6 mV 5 mV Load Regulation IOUT = 0 to 4mA Line Regulation VIN = 4.75 to 18V Short Circuit Current VREF = 0V 17 mA OV UV Window, LS Input, OC Input, ARST Input, and ON/OFF Input Thresholds Over-Voltage Thresholds WADJ = 0.25V, Offset from VREF, Input L to H 110 125 140 mV S1, S2 WADJ = 0.5V, Offset from VREF, Input L to H 230 250 270 mV WADJ = 1V, Offset from VREF, Input L to H 460 500 540 mV WADJ = 0.25V, Offset from VREF, Input L to H 110 125 145 mV WADJ = 0.5V, Offset from VREF, Input L to H 230 250 280 mV WADJ = 1V, Offset from VREF, Input L to H 460 500 550 mV Over-Voltage Thresholds S3, S4 Positive Mode Powered by ICminer.com Electronic-Library Service CopyRight 2003 2 UC1904 UC2904 UC3904 Unless otherwise stated, these specifications hold for TA = 0 to 70°C for the UC3904, -40 to ELECTRICAL CHARACTERISTICS (cont): +85°C for the UC2904, and -55 to +125°C for the UC1904, +VIN = 15V, WADJ = 0.5V, Sense Inputs 1-4, OC and LS Inputs = 2.5V. The ON/OFF Input and the ARST Input = 0V. PARAMETER TEST CONDITIONS MIN TYP MAX UNITS OV UV Window, LS Input, OC Input, ARST Input, and ON/OFF Input Thresholds (cont.) Under-Voltage Thresholds WADJ = 0.25V, Offset from VREF, Input H to L -140 -125 -110 mV S1, S2 WADJ = 0.5V, Offset from VREF, Input H to L -270 -250 -230 mV WADJ = 1V, Offset from VREF, Input H to L -540 -500 -460 mV WADJ = 0.25V, Offset from VREF, Input H to L -150 -125 -110 mV WADJ = 0.5V, Offset from VREF, Input H to L -285 -250 -230 mV WADJ = 1V, Offset from VREF, Input H to L -555 -500 -460 mV Under-Voltage Thresholds S3, S4 Positive Mode 30 50 70 mV/V Over-Voltage, WADJ = 0.5V, Input H to L -13.52 -13.2 -12.88 V Under-Voltage, WADJ = 0.5V, Input L to H -11.06 -10.8 -10.54 V 80 120 160 mV OV and UV Threshold Hysteresis As a Function of WADJ S3 Negative Mode Thresholds Hysteresis, WADJ = 0.5V S4 Negative Mode Thresholds Over-Voltage, WADJ = 0.5V, Input H to L -5.63 -5.5 -5.37 V Under-Voltage, WADJ = 0.5V, Input L to H -4.61 -4.5 -4.39 V 50 70 mV 5 µA/V Hysteresis, WADJ = 0.5V 30 WADJ Input Bias Current 0.25V < WADJ <1.0V -5 LS Threshold Input = H to L OC Threshold 1.96 2 2.04 V Threshold hysteresis 65 100 125 mV Input = H to L 1.9 2 2.1 V Threshold hysteresis ARST Input Threshold ON/OFF Input Threshold 50 100 150 mV Input = L to H 2.25 2.5 2.75 V Input = H to L 0.56 0.625 0.69 V 1.74 2.4 V Input high level Input low level 0.6 1.35 Input = 2.2V -1000 -250 Input = -12V -700 -500 -700 V Sense and Logic Input Bias Currents Sense 1-4, Positive Mode Sense 3 Negative Mode Input = 2.8V Sense 4 Negative Mode Input = -5V Line, and OC Inputs Input = 2.2V ON/OFF Input Input = 2.5V ARST Input Input = 0.5 250 -2000 800 nA -300 µA -500 -300 µA 300 1000 nA 150 600 nA nA -700 nA Open Collector Outputs (OV/OC Out, PG Out, PWRW Out, ON/OFF Out) Saturation Voltage IOUT = 10mA Leakage current VOUT = 20V 0.2 0.4 V 5 µA 350 ms/µF POR Delay Delay 160 250 Internal Pullup Current 9 µA Threshold Low to High 2.25 V OFF Delay Delay 120 185 250 ms/µF Internal Pullup current 12 µA Threshold Low to High 2.25 V OV Fault Delay Delay Powered by ICminer.com Electronic-Library Service CopyRight 2003 10 3 20 50 µs UC1904 UC2904 UC3904 PIN FUNCTIONAL DESCRIPTION the fault latch is reset by the ON/OFF Input, or a UVLO condition on the device. 2.5V: This is the output of the precision 2.5V reference. ARST Input: This input, with a 4:1 hysteretic threshold, is used to sequence a power system through the Auto ReStarT cycle. A delayed representation of a supply output voltage is used at this pin to provide adequate startup time for the power system, and a minimum power-off period. POR DLY: This pin is used, with an external capacitor, to program a Power-On-Reset delay. This delay is reset whenever there is a UV condition at one of the S1-S4 inputs, and then triggered upon the clearing of the UV condition. When reset, the voltage across the capacitor is quickly discharged to near zero volts, and the PG Out pin goes active low. Once triggered the capacitor is charged by a 9µA current source. The PG Out pin remains active low until the delay capacitor voltage reaches a 2.1V threshold. Gnd: Reference point for the internal reference and all thresholds, as well as the return for the remainder of the device. LS Input: The Line Sense input is used to monitor a voltage that varies with the input line voltage to a system. The input is compared to a precision 2.0V level and is used to activate the PWRW and PG outputs, as well as triggering the Auto Restart sequence. PG Out: During any fault, under-voltage, or UVLO condition this output is low. A Power Good indication (output off) is given when all supply conditions are within defined operating limits. During power-up the PG signal is delayed by a programmable Power On Reset delay. During UVLO the output is active low as long as the input supply, VIN, is above approximately 1.0V. OC Input: The Over-Current input can be used to respond to an inverted over-current signal. A low level signal at this input latches in a fault indication at the OV/OC output. PWRW Out: When a low line condition is sensed by the LS Input this output goes low. This output is disabled (off) during a UVLO condition. OFF DLY: This pin functions similarly to the POR DLY pin to delay the turn-on of the ON/OFF output transistor. The charging current and upper threshold are 12µA and 2.1V. S1-S4: These are the sense inputs for OV and UV monitoring of external voltages. All four inputs can be used to sense positive voltages with a simple divider to scale the voltage level to the 2.5V centered window. The S3 and S4 inputs can also be used to sense -12V and -5V supplies respectively with no external components. This is done with internal precision resistor dividers and two source only op-amps that are disabled when the pins are used in the positive mode. ON/OFF Input: With a high level at this input the ON/OFF Out pin is activated after a user-programmable delay. A high level also activates the PG Out pin, and resets the OV/OC fault latch. On/Off Out: This output is an open collector output that is activated by the ON/OFF Input, or the Auto Restart circuitry. Saturation voltage on this and all the open collector outputs is rated at 10mA of current. VIN: Input supply for the UC1904. The device is operational with 4.75V to 18V on this pin. OV/OC Out: In response to either an Over-Voltage or Over-Current situation this output is latched active low. There is nominal 20µs delay in the OV path to the fault latch, providing rejection to transient overshooting on the monitored voltages. The low condition is cleared when Powered by ICminer.com Electronic-Library Service CopyRight 2003 WADJ: The WADJ input is used to program the OV and UV window thresholds. The OV-UV window is centered around the 2.5V reference and is nominally ±20% per volt on the WADJ input pin. 4 UC1904 UC2904 UC3904 Note: Pin Numbers refer to J, N, and DW Packages. UNITRODE CORPORATION 7 CONTINENTAL BLVD. • MERRIMACK, NH 03054 TEL. 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