LTC4150 Linear Technology, LTC4150 Datasheet
LTC4150
Available stocks
Related parts for LTC4150
LTC4150 Summary of contents
Page 1
... These pulses correspond to a fixed quantity of charge flowing into or out of the battery. The part also indicates charge polarity as the battery is depleted or charged. The LTC4150 is intended for 1-cell or 2-cell Li-Ion and 3-cell to 6-cell NiCd or NiMH applications. , LTC and LT are registered trademarks of Linear Technology Corporation. U ...
Page 2
... F F Output Voltage Range Digital Outputs (INT, POL) .......................– 0. Operating Temperature Range LTC4150CMS .......................................... 0°C to 70°C LTC4150IMS ..................................... –40°C TO 85°C Storage Temperature Range ................. – 65°C to 150°C Lead Temperature (Soldering, 10 sec).................. 300°C ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T ...
Page 3
... Digital Output Low Voltage vs V 400 I = 1.6mA OL 350 300 POL PIN 250 200 INT PIN 150 100 (V) DD LTC4150 + – and SENSE . (Specifications are 25°C, unless A Operating 140 120 100 80 60 100 125 ...
Page 4
... F CLR (Pin 9): Clear Interrupt Digital Input. When asserted low for more than 20µs, CLR resets INT high. Charge counting is unaffected . INT may be directly connected to CLR. In this case the LTC4150 will capture each assertion + – and C of INT and wait at least 1µs before resetting it. This ensures ...
Page 5
... CLR and INT Not Connected REFHI 1. 100pF – 200k – AMPLIFIER + + – REFLO 0.95V Figure 1. Block Diagram 4150 F02 Figure 3. INT Minimum Pulse Width, CLR and INT Connected LTC4150 OFLOW UFLOW R COUNTER UP/DN CONTROL LOGIC POLARITY DETECTION 50% 50% INT t INT 4150 F03 INT ...
Page 6
... After an initialization interval, the LTC4150 begins counting charge. This interval depends on V the voltage across the sense resistor but will be at least 5ms. It may take an additional 80ms for the LTC4150 to accurately track the sense voltage. An internal undervolt- age lockout circuit monitors V ...
Page 7
... However, the number of interrupts, cou- lombs or Ah all represent battery charge. + connection to The LTC4150’s transfer function is set only by the value of the sense resistor and the gain G selected using Equation 1, the charge per interrupt can be determined from Equation Note that R + – ...
Page 8
... U U APPLICATIO S I FOR ATIO INT, POL and CLR INT asserts low each time the LTC4150 measures a unit of charge. At the same time, POL is latched to indicate the polarity of the charge unit. The integrator and counter continue running, so the microcontroller must service and clear the interrupt before another unit of charge accumu- lates ...
Page 9
... R1-R4 values using Equation 13. In either applica- is less than or CC tion, the LTC4150 will capture the first assertion of INT and wait at least 1µs before resetting it. This insures that INT pulses low for at least 1µs but gives automatic INT reset. is greater than ...
Page 10
... U APPLICATIO S I FOR ATIO 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 C + should be placed close the C and low leakage, unpolarized type. Use a 4-wire Kelvin sense ...
Page 11
... TYP 0.53 ± 0.152 (.021 ± .006) DETAIL “A” SEATING PLANE 0.17 – 0.27 (.007 – .011) TYP LTC4150 0.497 ± 0.076 (.0196 ± .003 REF 3.00 ± 0.102 (.118 ± .004) (NOTE ...
Page 12
... Linear Technology Corporation 12 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● LOAD + SENSE INT LTC4150 CLR 1.1Ω 100mΩ – SENSE + Figure 9. Ampere-Hour Gauge COMMENTS Simple Charger uses External FET, Features Preset Voltages, C/10 Charger Detection and Programmable Timer, Input Power Good Indication Standalone Charger with Programmable Timer ...