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MAX1640 Datasheet(PDF) 8 Page - Maxim Integrated Products |
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MAX1640 Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page The voltage at SET is given by: R1 = R2 (VREF / VSET -1 ); 10k Ω < R2 < 300kΩ where VREF = 2V and VSET is proportional to the desired output current level. The MAX1640/MAX1641 are specified for VSET between 0V and VREF. For VSET > VREF, output current increases linearly (with reduced accuracy) until it clamps at VSET ≈ 4V. Pulse-Trickle Mode: Selecting the Pulse-Trickle Current Pulling D0 low and D1 high selects pulse-trickle mode. This current equals VSET / (13.3RSENSE) and remains on for 12.5% of the period set by RTOFF. Pulse-trickle current maintains full charge across the battery and can slowly charge a cold battery before fast charging commences. Off Mode: Turning Off the Output Current Pulling D0 and D1 low turns off the P-channel FET and hence the output current flow. This mode also controls end of charge and protects the battery against exces- sive temperatures. Setting the Maximum Output Voltage Level The maximum output voltage should be programmed to a level higher than the output/battery voltage (ILOAD x RLOAD). An external resistor-divider between the output and ground (Figure 3) sets the voltage at TERM. Once the voltage at TERM exceeds the reference, the internal comparator turns off the P-channel FET, terminating current flow. Select R4 in the 10k Ω to 500kΩ range. R3 is given by: R3 = R4 ((VOUT / VTERM) -1) PERIOD = 3.2 x 10 x R (sec) -7 TOFF Adjustable-Output, Switch-Mode Current Source with Synchronous Rectifier 8 _______________________________________________________________________________________ D1 DO MODE OUTPUT CURRENT (A) 0 0 OFF 0 0 1 Top-Off VSET / (13.3RSENSE) 1 0 Pulse-Trickle VSET / (13.3RSENSE) 12.5% duty cycle 1 1 Fast Charge VREF / (13.3RSENSE) Table 1. Selecting Output Current Levels MAX1640 MAX1641 REF SET R1 R2 Figure 2. Adjusting the Output Current Level MAX1640 CS+ TERM CS- R3 RSENSE BATT L R4 Figure 3a. Setting the Maximum Output Voltage Level MAX1641 CS+ TERM CS- R3 BATT R4 RSENSE L Figure 3b. Setting the Maximum Output Voltage Level |
Similar Part No. - MAX1640_09 |
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Similar Description - MAX1640_09 |
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