LTC2914 Linear Technology, LTC2914 Datasheet
LTC2914
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LTC2914 Summary of contents
Page 1
... All monitors share a common undervoltage output and a common overvoltage output. The LTC2914-1 has latching capability for the overvoltage output. The LTC2914-2 has functionality to disable both the overvoltage and undervoltage outputs. Polarity selection and a buffered reference allow monitoring ≥ ...
Page 2
... Consult LTC Marketing for parts specifi ed with wider operating temperature ranges (Notes 1, 2) Operating Temperature Range LTC2914C ................................................ 0°C to 70°C LTC2914I ............................................. –40°C to 85°C + 0.3V) Storage Temperature Range ................... –65°C to 150°C CC Lead Temperature (Soldering, 10 sec) SSOP ................................................................ 300° ...
Page 3
... Since the CC V pin has an internal 6.5V shunt regulator, a low impedance supply that CC exceeds 6V may exceed the rated terminal current. Operation from higher voltage supplies requires a series dropping resistor. See Applications Information. LTC2914 , SEL = MIN TYP MAX UNITS ● ...
Page 4
... LTC2914 DIAGRA S VHn Monitor Timing V VHn UOT t UOD UV 1V VHn Monitor Timing (TMR Pin Strapped to V VHn V UOT www.DataSheet4U.com t UOD UV 1V NOTE: WHEN AN INPUT IS CONFIGURED AS A NEGATIVE SUPPLY MONITOR, VHn WILL TRIGGER AN OV CONDITION AND VLn WILL TRIGGER A UV CONDITION ...
Page 5
... CC 2914 G07 UV/OV Voltage Output Low vs Output Sink Current 1.0 0.8 125°C 25°C –40°C 0.6 0.4 0 (mA) UV/OV 2914 G10 LTC2914 Transient Duration vs Comparator Overdrive 700 600 500 RESET OCCURS ABOVE CURVE 400 300 200 100 100 0.1 1 COMPARATOR OVERDRIVE PAST THRESHOLD (%) ...
Page 6
... OV (Pin 11): Overvoltage Logic Output. Asserts low when any positive polarity input voltage is above threshold or any negative polarity input voltage is below threshold. Latched low (LTC2914-1). Held low for an adjustable delay time after all inputs are valid (LTC2914-2). Pin has a weak pull- and may be pulled above external pull-up ...
Page 7
... VL4 + 8 0.5V REF 1V 10 BUFFER OSCILLATOR GENERATOR UVLO + 2V – UVLO GENERATOR DISABLE CLEAR/BYPASS LTC2914-1 LTC2914-2 THREE-STATE POLARITY DECODER SEL 14 LTC2914 15 TMR V CC 400k PULSE V CC 400k OV PULSE LATCH LATCH + 13 – 1V DIS + 13 – 1V 2µA GND 9 2914 -1 BD 2914f ...
Page 8
... U U APPLICATIO S I FOR ATIO Voltage Monitoring The LTC2914 is a low power quad voltage monitoring cir- cuit with four undervoltage and four overvoltage inputs. A timeout period that holds asserted after all faults have cleared is adjustable using an external capacitor and is externally disabled. ...
Page 9
... V – complete the design. C – – − − ≈ 549 10 µ REF LTC2914 46.4k VH3 8.45k VL3 SEL R C GND 549k V3 2914 F04 –5V ±10% Figure 4. Negative Supply Monitor . 2914f 9 ...
Page 10
... A problem without adding hysteresis, which causes a new error term in the trip voltage, the LTC2914 lowpass fi lters the output of the fi rst stage comparator at each input. This fi lter integrates the output of the comparator before as- serting the logic. A transient at the input of the comparator of suffi ...
Page 11
... The OV output behaves as the UV output when LATCH is high (LTC2914-1). Selecting the UV/OV Timing Capacitor The UV and OV timeout period (t is adjustable to accommodate a variety of applications ...
Page 12
... If LATCH is pulled low while the timeout period is active, the OV pin latches as before. Disable (LTC2914-2) The LTC2914-2 allows disabling the UV and OV outputs via the DIS pin. Pulling DIS high forces both outputs to remain weakly pulled high, regardless of any faults that occur on the inputs. However UVLO condition oc- curs, UV asserts and pulls low, but the timeout function is bypassed ...
Page 13
... A2 A3 4.53k 4.64k 5 VH3 845Ω 4.64k 6 VL3 7 VH4 54.9k 768Ω 8 VL4 GND R C4 37.4k –3.3V –5V LTC2914 SEL 11 OV SYSTEM LATCH TMR 9 15 2914 TA02 C TMR 22nF TIMEOUT = 200ms SYSTEM 13 LATCH ...
Page 14
... R Z 8.25k 5V 2.5V C 0.1µF BYP 475k CC 1 VH1 SEL 44.2k 2 VL1 TMR 3 VH2 LTC2914-1 4.53k 1k 4 VL2 REF 4.53k 19.6k 5 VH3 LATCH VL3 7 VH4 R A3 4.53k 8 VL4 GND SYSTEM ...
Page 15
... TYP .016 – .050 .008 – .012 (0.406 – 1.270) (0.203 – 0.305) TYP INCHES (MILLIMETERS) LTC2914 R = 0.115 TYP 0.20 TYP 3.00 ±0.10 1.65 ± 0.10 (2 SIDES) (2 SIDES) 8 0.25 ± 0.05 0.75 ±0.05 0.50 BSC 4.40 ± ...
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... Linear Technology Corporation 16 1630 McCarthy Blvd., Milpitas, CA 95035-7417 ● (408) 432-1900 FAX: (408) 434-0507 U 0.1µF 44. SEL VH1 1k 27.4k VL1 VH2 OV 4.53k 1k LTC2914-1 VL2 UV 4.53k 19.6k REF VH3 LATCH 1k 2.05M VL3 VH4 4.53k 100k 10k VL4 GND TMR MANUAL RESET BUTTON (NORMALLY OPEN) COMMENTS 4.725V, 3.118V, 1V Threshold (± ...