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LTC2902-1IGN Datasheet(PDF) 1 Page - Linear Integrated Systems |
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LTC2902-1IGN Datasheet(HTML) 1 Page - Linear Integrated Systems |
1 / 16 page 1 LTC2902 2902f FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Programmable Quad Supply Monitor with Adjustable Reset Timer and Supply Tolerance s Simultaneously Monitors Four Supplies s 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage Thresholds s Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature s Selectable Supply Tolerance: 5%, 7.5%, 10%, 12.5% Below Monitored Voltage s Low Supply Current: 43 µA Typ s Adjustable Reset Time s RESET Disable Pin for Margining Applications s Open-Drain RST Output (LTC2902-1) s Push-Pull RST Output (LTC2902-2) s Individual Nondelayed Monitor Outputs for Each Supply s Power Supply Glitch Immunity s Guaranteed RESET for VCC ≥ 1V The LTC ®2902 is a programmable supply monitor for sys- tems with up to four supply voltages. One of 16 preset or adjustable voltage monitor combinations can be selected using an external resistor divider connected to the pro- gram pin. The preset voltage thresholds are digitally pro- grammable to 5%, 7.5%, 10% or 12.5% below the nomi- nal operating voltage, and are accurate to 1.5% over tem- perature. All four voltage comparator outputs are con- nected to separate pins for individual supply monitoring. The reset delay time is adjustable using an external capacitor. Tight voltage threshold accuracy and glitch immunity ensure reliable reset operation without false triggering. The RST output is guaranteed to be in the correct state for VCC down to 1V and may be disabled during supply margin testing. The LTC2902-1 features an open-drain RST output, while the LTC2902-2 has a push-pull RST output. The 43 µAsupplycurrentmakestheLTC2902idealforpower conscious systems and the part may be configured to monitor less than four inputs. The LTC2902-1/LTC2902-2 are available in the 16-lead narrow SSOP package. Quad Supply Monitor with Adjustable Tolerance (5V, 3.3V, 2.5V, 1.8V) s Desktop and Notebook Computers s Multivoltage Systems s Telecom Equipment s Portable Battery-Powered Equipment s Network Servers , LTC and LT are registered trademarks of Linear Technology Corporation. V1 V2 VREF VPG COMP1 COMP2 COMP3 COMP4 RST RDIS T0 T1 GND 10 11 R1 59k 1% R3 10k POWER GOOD R2 40.2k 1% 12 7 9 8 6 15 1 16 2 13 3 14 4 5 CRT 47nF C2 0.1 µF C1 0.1 µF V4 V3 LTC2902-2 CRT tRST = 216ms MARGIN TOLERANCE = 5% 2902 TA01 DC/DC CONVERTER 1.8V 2.5V 3.3V 5V SYSTEM LOGIC |
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