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LTC4069EDC Datasheet(PDF) 7 Page - Linear Integrated Systems |
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LTC4069EDC Datasheet(HTML) 7 Page - Linear Integrated Systems |
7 / 18 page LTC4069 7 4069fc For more information www.linear.com/LTC4069 siMpliFieD block DiagraM – + – + 2 + MP M2 1 × M1 1000 × VCC VCC R1 R2 MIN ENABLE R3 R4 R5 2.9V CHRG 6 PROG 1 GND 4069 F01 RPROG BAT 1V PROG C/10 C1 – + TA TDIE 115°C 0.1V 1.2V SUSPEND D3 TOO HOT TOO COLD NTC_EN 0.1V D2 3.6V D1 1.2V REF CA MA LOBAT 5 R7 NTC R8 R9 R10 VCC VCC – + UVLO 3 4 BAT LOGIC COUNTER OSCILLATOR CHARGE CONTROL – + C3 – + C2 C5 VA 4V – + SHUTDOWN SUSPEND OR AND RNOM RNTC C4 operaTion Figure 1. LTC4069 Block Diagram The LTC4069 is a linear battery charger designed primarily for charging single-cell lithium-ion batteries. Featuring an internal P-channel power MOSFET, the charger uses a constant-current/constant-voltage charge algorithm with programmablecurrent.Chargecurrentcanbeprogrammed up to 750mA with a final float voltage accuracy of ±0.6%. The CHRG open-drain status output indicates if C/10 has beenreached.Noblockingdiodeorexternalsenseresistor is required; thus, the basic charger circuit requires only two external components. An internal termination timer and trickle charge low-battery conditioning adhere to battery manufacturer safety guidelines. Furthermore, the LTC4069 is capable of operating from a USB power source. An internal thermal limit reduces the programmed charge current if the die temperature attempts to rise above a presetvalueofapproximately115°C.Thisfeatureprotects the LTC4069 from excessive temperature and allows the user to push the limits of the power handling capability of a given circuit board without risk of damaging the LTC4069 or external components. Another benefit of the LTC4069 thermal limit is that charge current can be set according to typical, not worst-case, ambient temperatures for a given application with the assurance that the charger will automatically reduce the current in worst-case conditions. |
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