LTC4069 Linear Technology, LTC4069 Datasheet
LTC4069
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LTC4069 Summary of contents
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... The LTC4069 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 is available in a tiny 6-lead, low profi le (0.75mm) 2mm × 2mm DFN package. 500mA BAT + 4 ...
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... ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LTC4069EDC#PBF LTC4069EDC#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: For more information on tape and reel specifi ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC4069 is guaranteed to meet performance specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...
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... LTC4069 TYPICAL PERFORMANCE CHARACTERISTICS Battery Regulation (Float) Voltage vs Battery Charge Current 4. 25° PROG 4.22 4.21 4.20 4.19 4.18 4.17 4.16 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 75 50 ...
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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 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 has less than 20μA supply can range from CC current and about 1μA battery drain current. 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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... CHRG 2 2.9V BAT OPERATION 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 programmable current. Charge current can be programmed up to 750mA with a fi nal fl oat voltage accuracy of ±0.6%. ...
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... Shutdown Mode The LTC4069 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 ...
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... The LTC4069 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. 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 increase the output impedance of the current source pair, M1 and M2 (note that M1 is the internal P-channel power MOSFET) ...
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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 goes into hold mode when the value of the NTC thermistor drops to 0.53 times the value which corresponds to approximately 40°C, NOM ...
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... This feature is particularly useful if the LTC4069 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 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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... Board Layout Considerations In order to deliver maximum charge current under all conditions critical that the exposed metal pad on the backside of the LTC4069 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 • ...
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... V CC Figure 6. NTC Circuits Thermistors The LTC4069 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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... 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 0.75 ±0.05 LTC4069 www.DataSheet4U.com , and the value of the thermistor at 40°C, COLD ⎛ TOL COLD • ⎝ ⎜ ...
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... LTC4069 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 ...