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LTC4150CMSTRPBF Datasheet(PDF) 11 Page - Linear Technology |
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LTC4150CMSTRPBF Datasheet(HTML) 11 Page - Linear Technology |
11 / 14 page LTC4150 11 4150fc APPLICATIONS INFORMATION PC BOARD LAYOUT SUGGESTIONS Keep all traces as short as possible to minimize noise and inaccuracy. The supply bypass capacitor C2 should be placed close to the LTC4150. The 4.7μF filter capacitor CF should be placed close the CF+ and CF– pins and should be a low leakage, unpolarized type. Use a 4-wire Kelvin sense connection for the sense resistor, locating it close to the LTC4150 with short sense traces to the SENSE+ and SENSE– pins and longer force lines to the battery pack and powered load, see Figure 7. 4150 F07 PIN 1 TO BATTERY TO CHARGER LTC4150 RSENSE Figure 7. Kelvin Connection on SENSE Resistor TYPICAL APPLICATIONS Figure 8 shows a typical application designed for a single cell lithium-ion battery and 500mA maximum load current. Use Equation 1 to calculate RSENSE = 0.05V/0.5A = 0.1Ω. With RSENSE = 0.1Ω, Equation 7 shows that each interrupt corresponds to 0.085mAh. Equation 14, derived from Equation 2, gives the number of INT assertions for average battery current, IBATT, over a time, t, in seconds: INT Assertions = GVF • IBATT • RSENSE • t (14) Loading the battery so that 51.5mA is drawn from it over 600 seconds results in 100 INT assertions. For an 800mAh battery, this is (51.5mA • 1/6h) / 800mAh = 11% of the battery’s capacity. With a microcontroller supply = 5V, Equation 11 gives RL > 2.875k. The nearest standard value is 3k. From Equation 12, RL = 3k gives R1 + R2 equal to 150.5k. A single cell lithium-ion battery can discharge as low as 2.7V. From Equation 13, select R1 = 75k; the nearest standard value for R2 is 76.8k. Also from Equation 13, we choose R3 = 75k and R4 = 76.8k. INT SENSE+ SENSE– SHDN SHUTDOWN R4 76.8k R3 75k CLR POL LTC4150 μP C2 4.7μF RL 3k 10 9 8 7 6 1 2 5 4150 F08 VDD GND RL 3k 5.0V POWER-DOWN SWITCH CL 47μF LOAD CF + CF – 3 4 CF 4.7μF SINGLE-CELL Li-Ion 3.0V ~ 4.2V RSENSE 0.1Ω R2 76.8k R1 75k + Figure 8. Typical Application, Single Cell Lithium-Ion Battery |
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