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LTC2901 Datasheet(PDF) 1 Page - Linear Technology |
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LTC2901 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 16 page  1 LTC2901 2901fb Programmable Quad Supply Monitor with Adjustable Reset and Watchdog Timers ■ Simultaneously Monitors Four Supplies ■ 16 User Selectable Combinations of 5V, 3.3V, 3V, 2.5V, 1.8V, 1.5V and/or ±Adj Voltage Thresholds ■ Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage Over Temperature ■ Selectable Supply Tolerance: 5% and 10% Below Monitored Voltage (LTC2901-3/LTC2901-4) ■ Low Supply Current: 43 μA Typ ■ Adjustable Reset Time ■ Adjustable Watchdog Time ■ Open-Drain RST Output (LTC2901-1/LTC2901-3) ■ Push-Pull RST Output (LTC2901-2/LTC2901-4) ■ Individual Nondelayed Monitor Output for Each Supply ■ Power Supply Glitch Immunity ■ Guaranteed RST for VCC ≥ 1V ■ 16-Lead Narrow SSOP Package The LTC ®2901 is a programmable supply monitor for systems with up to four supply voltages. One of 16 preset or adjustable voltage monitor combinations can be se- lected using an external resistor divider connected to the program pin. The preset voltage thresholds are accurate to ±1.5% over temperature. All four voltage comparator outputs are connected to separate pins for individual supply monitoring. The reset and watchdog delay times are adjustable using external capacitors. 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. The LTC2901-1/ LTC2901-3 features an open-drain RST output, while the LTC2901-2/LTC2901-4 has a push-pull RST output. The 43 μA supply current makes the LTC2901 ideal for power conscious systems and it may be configured to monitor less than four inputs. The parts are available in the 16-lead narrow SSOP package. Quadruple Supply Monitor (5V, 3.3V, 2.5V, 1.8V) ■ Desktop and Notebook Computers ■ Multivoltage Systems ■ Telecom Equipment ■ Portable Battery-Powered Equipment ■ Network Servers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. V1 V2 VREF VPG COMP1 COMP2 COMP3 COMP4 WDI WDO RST GND R1 59k 1% R3 10k POWER GOOD R2 40.2k 1% CWT 47nF CRT 47nF C2 0.1 μF C1 0.1 μF V4 V3 LTC2901-2 CWT CRT tRST = 216ms tWD = 940ms 2901 TA01 DC/DC CONVERTER 1.8V 2.5V 3.3V 5V SYSTEM LOGIC DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO Quadruple Supply Monitor (5V, 3.3V, 2.5V, 1.8V) 10% Undervoltage Monitoring, Watchdog Asserts RST V1 V2 VREF VPG COMP1 COMP2 COMP3 COMP4 WDI TOL RST GND R1 59k 1% R3 10k POWER GOOD R2 40.2k 1% CWT 47nF 5V CRT 47nF C2 0.1 μF C1 0.1 μF V4 V3 LTC2901-4 CWT CRT tRST = 216ms tWD = 940ms 2901 TA01b DC/DC CONVERTER 1.8V 2.5V 3.3V 5V SYSTEM LOGIC Patent Pending. |
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