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LTC1998IS6 Datasheet(PDF) 7 Page - Linear Technology |
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LTC1998IS6 Datasheet(HTML) 7 Page - Linear Technology |
7 / 8 page LTC1998 7 1998fa QUICK DESIGN GUIDE How to Calculate the External Resistor Values The LTC1998 is a low battery warning indicator and is es- pecially designed for monitoring the voltage of single-cell Lithium-Ion batteries. The LTC1998 compares its supply pin (BATT) to an accurate internal reference; if the battery voltage falls below the programmed low battery threshold voltage of the LTC1998, the battery low pin (BATTLO) will change state, from high to low, to indicate a low battery condition. The low battery threshold voltage is programmed via the voltage threshold adjust pin (VTH.A). A hysteresis adjust pin (VH.A) will add hysteresis to the programmed value of the low battery threshold voltage. Typical Application Table 1: Design Equations for R1, R2, R3, Figure 1 Choose desired values for: • VBATT.Th: Low Battery Threshold Voltage • VHYST: Hysteresis Voltage • IR: Max Allowable Resistor Current Solve: RR R R V I RR V VV RR V V R RR R R TOTAL R TOTAL BATT Th HYST TOTAL BATT Th TOTAL =+ + = = + ⎛ ⎝⎜ ⎞ ⎠⎟ = ⎛ ⎝⎜ ⎞ ⎠⎟ = 12 3 42 1 5 1 2 5 11 31 2 . •– •– – –– . . Figure 1. Low Battery Threshold Detector with Hysteresis Example 1: A system using a 4.2V (fully charged) Lithium- Ion battery requires a low battery threshold of 2.7V, 100mV hysteresis and can allow up to 4.2μA maximum resistor current. RTOTAL = 1MΩ, R1 = 786k, R2 = 66k and R3 = 148k Choose standard 1% values. R1 = 787k, R2 = 66.5k, R3 = 147k 1998 F01 LTC1998 R1 1% R2 1% R3 1% VH.A VTH.A BATT VLOGIC BATTLO 4 3 2 1 5 6 REGULATOR μP GND 0.1μF 1.5V TO 4.2V VLOGIC + |
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