The document describes the LTC2938 and LTC2939 power monitors, which can monitor 4 or 6 power supplies, with a maximum voltage of 12V and a minimum voltage of 1.2V. The monitor has ±1.5% accuracy and watchdog timers.
The document introduces the LTC2938 and its counterpart, the LTC2939, as power supply monitors designed specifically for multivoltage systems with low voltage requirements (down to 1.2V). The LTC2938 is configured to monitor four supplies and is available in compact 12-pin MSOP and DFN packages.
Key features highlighted include a tight threshold accuracy of +1.5% over the operating temperature range, which helps prevent nuisance resets in systems with standard 5% power supply tolerance. The device incorporates built-in glitch immunity to suppress spurious noise without degrading monitor accuracy and includes an open-drain reset output that can be configured for wired-or connections.
| Number of Supplies Monitored | 4 |
|---|---|
| Threshold Accuracy | +1.5% |
| Minimum Monitored Voltage | 1.2V |
| Package Types | 12-pin MSOP and DFN |
| Supply Tolerance Compatibility | 5% |
The device includes watchdog timers and monitors for rails down to 1.2V.
No, neither monitor requires external calibration or trimming.
It uses an integration scheme that suppresses spurious resets without degrading monitor accuracy.