LTC4069-4.4 Linear Technology, LTC4069-4.4 Datasheet
LTC4069-4.4
Related parts for LTC4069-4.4
LTC4069-4.4 Summary of contents
Page 1
... The LTC4069-4.4 also includes automatic recharge, low- battery charge conditioning (trickle charging), soft-start (to limit inrush current) and an NTC thermistor input used to monitor battery temperature. The LTC4069-4.4 is available in a tiny 6-lead, low profi le (0.75mm) 2mm × 2mm DFN package. 500mA BAT + 4 ...
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... LTC4069-4.4 ABSOLUTE MAXIMUM RATINGS (Note < 1ms and Duty Cycle < 1% ................. – 0. Steady State ............................................ – 0. BAT, CHRG .................................................. –0. PROG, NTC ..................................... – 0. BAT Short-Circuit Duration ............................Continuous BAT Pin Current .................................................. 800mA PROG Pin Current ................................................ 800μA Junction Temperature (Note 6) ............................ 125°C Operating Temperature Range (Note 2)....– ...
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... Hysteresis Falling Voltage Threshold Hysteresis Falling Threshold Note 4: Although the LTC4069-4.4 functions properly at 3.75V, full charge current requires an input voltage greater than the desired fi nal battery voltage per the ΔV specifi cation. UVCL1 Note expressed as a fraction of measured full charge current C/10 with indicated PROG resistor ...
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... LTC4069-4.4 TYPICAL PERFORMANCE CHARACTERISTICS Battery Regulation (Float) Voltage vs Charge Current 4. 25° PROG 4.42 4.40 4.38 4.36 0 100 200 400 300 I (mA) BAT 4069 G01 Charge Current vs Supply Voltage (Constant-Current Mode) 200 R = 10k PROG V = 3.8V 175 BAT T = 25°C A 150 125 100 ...
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... CC 0 –1 –2 –3 –4 –5 –6 –7 100 –50 – TEMPERATURE (°C) 5.0 4.5 4.0 3.5 3.0 2.5 2 100 4069 G20 LTC4069-4.4 www.DataSheet4U.com Trickle Charge Current vs Temperature BAT PROG 10k PROG –50 – TEMPERATURE (°C) ...
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... I = BAT Floating the PROG pin puts the charger in shutdown mode. In shutdown mode, the LTC4069-4.4 has less than 20μA supply current and about 1μA battery drain current. can range from 3.75V Exposed Pad (Pin 7): Ground. The Exposed Pad must be soldered to the PCB ground to provide both electrical contact and rated thermal performance ...
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... LTC4069-4.4 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 LTC4069-4.4 or external components. Another benefi the LTC4069-4.4 thermal limit is that charge current can be set according to typical, not worst-case, ambient LTC4069-4.4 www.DataSheet4U.com ...
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... Shutdown Mode The LTC4069-4.4 can be disabled by fl oating the PROG pin. In shutdown mode, the battery drain current is reduced to less than 1μA and the supply current to about 20μA. Timer and Recharge The LTC4069-4 ...
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... The LTC4069-4.4 uses a unique architecture to charge a battery in a constant-current, constant-voltage and constant-temperature fashion. Figure 1 shows a Simplifi ed Block Diagram of the LTC4069-4.4. Three of the amplifi er feedback loops shown control the constant-current (CA), constant-voltage (VA), and constant-temperature (TA) modes. A fourth amplifi er feedback loop (MA) is used to ...
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... CC NOM value equal to the value of the chosen NTC thermistor at 25°C (this value is 100k for a Vishay NTHS0603N01N1003J thermistor). The LTC4069-4.4 goes into hold mode when the value of the NTC thermistor drops to 0.53 times the 10 UVLO IF V > 3.6V AND ...
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... This feature is particularly useful if the LTC4069-4.4 is powered from a supply with long leads (or any relatively high output impedance). For example, USB-powered systems tend to have highly variable source impedances (due primarily to cable quality and length) ...
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... PFET. The on-resistance of the LTC4069-4.4 power device is approximately 450mΩ with a 5V supply. The actual on-resistance will be slightly higher due to the fact that the input supply will drop to less than 5V ...
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... BAT In order to deliver maximum charge current under all conditions critical that the exposed metal pad on the backside of the LTC4069-4.4 package is soldered to the PC board copper and extending out to relatively large copper areas or internal copper layers connected using vias. Correctly soldered to a 2500mm copper board the LTC4069-4.4 has a thermal resistance of approximately 60° ...
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... V CC Figure 6. NTC Circuits Thermistors The LTC4069-4.4 NTC trip points are designed to work with thermistors whose resistance-temperature characteristics follow Vishay Dale’s “R-T Curve 1.” The Vishay NTHS0603N01N1003J is an example of such a thermistor. However, Vishay Dale has many thermistor products that follow the “ ...
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... DC Package 6-Lead Plastic DFN (2mm × 2mm) (Reference LTC DWG # 05-08-1703) 0.675 ±0.05 PIN 1 BAR PACKAGE TOP MARK OUTLINE (SEE NOTE 6) 0.25 ± 0.05 0.200 REF LTC4069-4.4 www.DataSheet4U.com , and the value of the thermistor COLD . The formula is: HOT ⎛ TOL COLD • ⎝ ⎜ ...
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... LTC4069-4.4 RELATED PARTS PART NUMBER DESCRIPTION Battery Chargers LTC1734 Lithium-Ion Linear Battery Charger in ThinSOT LTC1734L Lithium-Ion Linear Battery Charger in ThinSOT LTC4002 Switch Mode Lithium-Ion Battery Charger LTC4050 Lithium-Ion Linear Battery Charger Controller LTC4052 Monolithic Lithium-Ion Battery Pulse Charger LTC4053 USB Compatible Monolithic Li-Ion Battery Charger ...