LTC2901-2CGN Linear Technology, LTC2901-2CGN Datasheet
LTC2901-2CGN
Specifications of LTC2901-2CGN
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LTC2901-2CGN Summary of contents
Page 1
... V LTC2901-3 features an open-drain RST output, while the LTC2901-2/LTC2901-4 has a push-pull RST output. The 43μA 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. ...
Page 2
... LTC2901-3C/LTC2901-4C ....................... 0°C to 70°C LTC2901-1I/LTC2901-2I/ LTC2901-3I/LTC2901-4I .................... –40°C to 85°C + 0.3V) Storage Temperature Range .................. – 65°C to 150°C CC Lead Temperature (Soldering, 10 sec)................... 300° ORDER PART NUMBER COMP3 1 LTC2901-1CGN COMP1 2 LTC2901-2CGN V3 3 LTC2901-1IGN V1 4 LTC2901-2IGN CRT 5 RST 6 GN16 PART MARKING TOL 7 29011 WDI ...
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... Note 6: The output pins RST, WDO and COMPX have internal pull-ups typically 6μA. However, external pull-up resistors may be used when faster rise times are required or for Note 7: The push-pull RST output pin on the LTC2901-2/LTC2901-4 is actively pulled up to V2. LTC2901 MIN TYP MAX UNITS ● ...
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... V1 LTC2901-3 I SINK V2 2.5mA, RST, WDO V3 100μA OR COMPX V4 2901 F02 Figure 2. RST, WDO, COMPX V Test OL V Monitor Timing X V RTX t RST t UV 1.5V Watchdog Timing (LTC2901-1/LTC2901-2) t RST Watchdog Timing (LTC2901-3/LTC2901-4) t RST LTC2901-2 RST V1 LTC2901 SOURCE V3 200μA V4 2901 F03 Figure 3. Active Pull-Up RST V ...
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... TEMPERATURE (°C) – ADJ Threshold Voltage vs Temperature 0.018 0.012 0.006 0 –0.006 –0.012 –0.018 – 100 –40 – TEMPERATURE (°C) LTC2901 3V Threshold Voltage vs Temperature 2.850 2.840 2.830 2.820 2.810 2.800 2.790 2.780 2.770 2.760 80 – 60 100 –40 – TEMPERATURE (°C) 2901 G02 1 ...
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... LTC2901 W U TYPICAL PERFOR A CE CHARACTERISTICS I vs Temperature V1 100 – 60 –40 – TEMPERATURE (°C) 2901 G09 I vs Temperature 2.5V 0 1.8V 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 – 60 –40 – TEMPERATURE (°C) 2901 G12 RST Output Voltage vs V1, V ...
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... SINK vs Supply Voltage 25° 0. 0. (V) 2901 G19 COMPX and WDO Pull-Up Current vs V2 (COMPX and WDO Held at 0V 25° 4.5 1.5 2 2 (V) 2901 G24 RST Pull-Up Current vs V2 (LTC2901-2/LTC2901- 25° RT33 2 V RT30 V RT25 2.5 3 3 (V) 2901 G27 2901fb 7 ...
Page 8
... RST is high) within the selected watchdog time-out period, prohibiting a high-to-low transition on the WDO pin (LTC2901-1/ LTC2901-2). The watchdog time-out period is set by the value of the capacitor that is attached to the CWT pin rising or falling edge on the WDI pin clears the voltage on the C capacitor, preventing WDO from going low ...
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... V CC GENERATOR 2μA 22μA 10μA TRANSITION WATCHDOG V CC DETECT TIMER 22μA 5 CRT 8 WDI C RT LTC2901 6μA COMP1 2 V2 6μA COMP2 16 V2 6μA COMP3 1 V2 6μA COMP4 15 V2 LTC2901-1 6μA RST LTC2901 2μA 6μA WDO 7 9 CWT C WT 2901 DB-1 RST 6 2901fb 9 ...
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... POWER DETECT V2 ADJUSTABLE RESET PULSE V CC GENERATOR 2μA 22μA 10μA TRANSITION WATCHDOG V CC DETECT TIMER 22μA 5 CRT 8 WDI 6μA COMP1 2 V2 6μA COMP2 16 V2 6μA COMP3 1 V2 6μA COMP4 15 V2 LTC2901-3 6μA RST LTC2901 2μA 9 CWT C WT 2901 DB-1 RST 6 2901fb ...
Page 11
... Single pin programming selects input voltage monitor combinations. All four voltage inputs must be above predetermined thresholds for the reset not to be invoked. The LTC2901 will assert the reset and comparator outputs during power-up, power- down and brownout conditions on any one of the voltage inputs ...
Page 12
... Tables 2 and 3 offer suggested 1% resistor values for various adjustable applications. Once the resistor divider is set in the 5% tolerance mode (LTC2901-3/LTC2901-4), there is no need to change the divider for the 10% mode because the internal and exter- nal reference is scaled accordingly, moving the trip point by – ...
Page 13
... Using a 10k pull- up resistor, the rise time is reduced to 3.3μs for a 150pF load capacitance. The LTC2901-2 has an active pull- the RST output. The typical performance curve (RST Pull-Up Cur- rent vs V2 curve) demonstrates that the pull-up current is somewhat linear versus the V2 voltage and R mated to be approximately 625Ω ...
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... U U APPLICATIO S I FOR ATIO Monitoring Power Supply Controller Activity Figure 7 demonstrates how the LTC2901 can be used to monitor switcher activity. The monitor is configured to supervise 3.3V, 2.5V, 1.8V and one adjustable input. Because 2.5V does not exist in this application, the V2 input is tied to the V1 (3.3V) input. The feedback voltage on the LTC1772 (0 ...
Page 15
... CRT V REF 6 11 SYSTEM RST V PG RESET 7 10 WDO GND WDI CWT Quad Supply Monitor with LED Undervoltage Indicators 5V WATCHDOG STATUS C Generate RESET Pulse Through Watchdog Timeout (LTC2901-1/LTC2901-2) 1 COMP3 COMP2 2 COMP1 COMP4 3 ADJ LTC2901 V4 5 10k CRT V REF 6 RST RST V PG ...
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... Plastic SSOP (Narrow .150 Inch) (Reference LTC DWG # 05-08-1641) (4.801 – 4.978 .004 – .0098 (0.102 – 0.249) .229 – .244 .0250 (5.817 – 6.198) (0.635) BSC www.linear.com ● 10k LTC2901 COMP1 14 16 0.1μF 2.5V MONITOR 2.5V V2 COMP2 COMP3 ...