LTC1733 Linear Technology, LTC1733 Datasheet
LTC1733
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LTC1733 Summary of contents
Page 1
... This feature allows the user to program a high charge current without risk of damaging the LTC1733 or the handheld product. No external current sense resistor is needed and no blocking diode is required due to the internal MOSFET architecture ...
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... PROG V Rising BAT V Rising CC PROG Pin Voltage Rising - V ) Voltage Falling CC BAT ( Voltage Rising CC BAT ORDER PART NUMBER 10 ACPR 9 BAT 8 SEL LTC1733EMSE 7 PROG 6 NTC MSE PART MARKING LTLX MIN TYP MAX UNITS 4 4.059 4.1 4.141 V 4.158 4.2 4.242 V 465 ...
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... Note 2: The Absolute Maximum BAT Current Rating of 1.6A is guaranteed by design and current density calculations. The Absolute Maximum PROG Current Rating is guaranteed to be 1/1000 of BAT current rating by design. Note 3: The LTC1733E is guaranteed to meet performance specifications from Specifications over the – operating ...
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... LTC1733 W U TYPICAL PERFOR A CE CHARACTERISTICS Battery Regulation Voltage vs Battery Charge Current 4. 4. SEL R = 1.5k PROG 4.20 4.18 4.16 4. 4.12 SEL 4.10 4.08 4.06 0 100 200 300 400 500 600 700 800 900 1000 I (mA) BAT 1733 G01 PROG Pin Voltage vs Charge Current 1 ...
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... I = 0mA BAT SEL 103 C TIMER 102 101 100 7.0 25 –50 – TEMPERATURE( C) LTC1733 Trickle Charge Current vs Temperature 130 = 120 = 110 100 100 –50 – TEMPERATURE ( C) 1733 G11 Timer Accuracy 105 104 103 = 0 ...
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... PROG: Charge Current Program, Shutdown Input and Charge Current Monitor Pin. The charge current is pro- grammed by connecting a resistor, R When in constant-current mode, the LTC1733 servos the PROG pin voltage to 1.5V. In all modes the voltage on the PROG pin can be used to measure the charge current as is less that 2 ...
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... TIMER C TIMER – – 2.485V – SHDN 2.15V + R5 1.5V R6 0.15V + C2 R7 – – TO BAT 7 PROG R PROG Figure 1. LTC1733 1000 + – REF R3 2 GND BAT 9 8 SEL 1733 F01 sn1733 1733fs 7 ...
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... C. This feature protects the LTC1733 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 LTC1733 or the external components. Another benefit of the LTC1733 thermal limit is that charge current can be set according to ...
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... In shutdown the internal linear regulator is turned off, and the internal timer is reset. Recharge The LTC1733 has the ability to recharge a battery assuming that the battery voltage has been charged above 4.05V (SEL = 5V) or 3.95V (SEL = 0V). Once above these thresholds, a new charge cycle will begin if the battery voltage drops below 4V (SEL = 5V ...
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... When the LTC1733 is in charge mode, the CHRG pin is pulled low by the internal N-channel MOSFET. To detect this mode, force the digital output pin, OUT, high and measure the voltage at the CHRG pin. The N-channel MOSFET will pull the pin low even with the 2k pull-up resistor ...
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... CC – LTC1733 Figure 3. Thermistors The LTC1733 NTC trip points were designed to work with thermistors whose resistance-temperature characteris- tics follow Vishay Dale’s “R-T Curve 2”. The Vishay NTHS0603N02N1002J is an example of such a ther- mistor. However, Vishay Dale has many thermistor prod- ucts that follow the “R-T Curve 2” characteristic in a variety of sizes ...
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... T = 105 C – (5V – 3.75V) • 1.2A • 105 C – 1.5W • 40 C/W = 105 C – The LTC1733 can be used above 45 C, but the charge current will be reduced below 1.2A. The approximate charge current at a given ambient temperature can be approximated by: I BAT Consider the above example with an ambient temperature ...
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... C/ example, a correctly soldered LTC1733 can deliver over 1250mA to a battery from a 5V supply at room temperature. Without a backside thermal connection, this number could drop to less than 500mA. ...
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... LTC1733 U TYPICAL APPLICATIO Basic Li-Ion Battery Charger with Reverse Polarity Input Protection 5V WALL ADAPTER BAT LTC1733 BAT CC 8 SEL + 4.2V Li-Ion 4.7 F BATTERY 4 7 TIMER PROG GND NTC 1. 0 1733 F06 sn1733 1733fs ...
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... BSC (NOTE 3) 4.88 0.10 (.192 .004) DETAIL “A” 0.254 0 – 6 TYP 0.53 0.01 (.021 .006) DETAIL “A” SEATING PLANE 0.17 – 0.27 (.007 – .011) LTC1733 BOTTOM VIEW OF EXPOSED PAD OPTION 2.06 0.102 (.081 .004) 1 1.83 0.102 (.072 .004) 10 0.497 0.076 (.0196 .003 REF 3 ...
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... FAX: (408) 434-0507 www.linear.com Full Featured Single Cell Li-Ion Charger SEL ACPR CHRG FAULT 4 LTC1733 BAT 6 9 NTC BAT TIMER PROG R NTC 10k GND 0 COMMENTS Up to 1.5A Charge Current; Preset and Adjustable Battery Voltages ...