ltc4097 Linear Technology Corporation, ltc4097 Datasheet
ltc4097
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ltc4097 Summary of contents
Page 1
... The LTC4097 can be put into shutdown mode reducing the DCIN supply current to 20µA, the USBIN supply current to 10µA, and the battery drain current to less than 2µ ...
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... CC T EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER LTC4097EDDB Order Options Tape and Reel: Add #TR Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF Lead Free Part Marking: Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC4097 is guaranteed to meet the 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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... LTC4097 TYPICAL PERFORMANCE CHARACTERISTICS Battery Regulated Output (Float) Voltage vs Charge Current 4. DCIN IDC 4.24 4.22 4.20 4.18 4.16 4.14 4.12 4.10 0 200 400 600 800 1000 1200 CHARGE CURRENT (mA) 4097 G01 Battery Regulated Output (Float) Voltage vs DCIN Voltage 4. 10mA BAT IDC 4.24 4.22 4.20 4.18 4.16 4.14 4.12 4.10 4.25 4.50 4.75 5.00 5.25 V (V) DCIN 4097 G04 Charge Current vs IUSB Pin ...
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... THERMAL REGULATION 1000 800 600 400 DCIN 200 IDC θ = 60°C 5.50 2.0 2.5 3.0 3.5 4.0 V (V) BAT LTC4097 NTC = 0V, HPWR = 5V 25°C, A unless otherwise noted. Recharge Threshold Voltage vs Temperature 120 DCIN USBIN 115 110 105 100 –50 – ...
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... LTC4097 TYPICAL PERFORMANCE CHARACTERISTICS DCIN Power FET On-Resistance vs Temperature 550 DCIN I = 200mA BAT 500 450 400 350 300 –50 – TEMPERATURE (°C) 4097 G19 VNTC VNTC USBIN DCIN 100 125 ...
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... G28 USBIN 4.10 4.05 4.00 3.95 3. 5.5V USBIN 3.85 3. 4.25V USBIN 3.75 3.70 – 100 4097 G30 LTC4097 NTC = 0V, HPWR = 5V 25°C, A unless otherwise noted. Shutdown Supply Current vs Temperature and V DCIN SUSP = V DCIN USBIN DCIN V = 5.5V DCIN V = 4.25V DCIN – 100 TEMPERATURE (°C) ...
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... C ⎯ H ⎯ R ⎯ G (Pin 4): Open-Drain Charge Status Output. When the LTC4097 is charging, the ⎯ C ⎯ H ⎯ R ⎯ G pin is pulled low by an internal N-channel MOSFET. When the charge cycle is com- pleted, ⎯ C ⎯ H ⎯ R ⎯ G becomes high impedance. This output can sink up to 10mA, making it suitable for driving a LED ...
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... BAT (Pin 12): Charger Output. This pin provides charge current to the battery and regulates the fi nal fl oat voltage to 4.2V. Exposed Pad (Pin 13): Ground. The exposed backside of the package is ground and must be soldered to the PC board ground for electrical connection and maximum heat transfer. LTC4097 4097f 9 ...
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... LTC4097 BLOCK DIAGRAM VNTC – R NOM TOO COLD + NTC 6 TOO HOT – NTC 3 + NTC_EN – 10mA MAX CHRG 4 LOGIC RECHRG TRICKLE TERM 5 SUSP R SUSP TERMINATION 10 DCIN 1 CC/CV REGULATOR DCON + – 4.2V DCIN UVLO + – BAT SUSPEND + 4.1V RECHARGE – BAT DC_ENABLE – ...
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... Power Source Selection The LTC4097 can charge a battery from either the wall adapter input or the USB port input. The LTC4097 automati- cally senses the presence of voltage at each input. If both power sources are present, the LTC4097 defaults to the wall adapter source provided suffi ...
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... BAT pin voltage is below 2.9V, the LTC4097 supplies 1/10th of the full charge current to the battery until the BAT pin rises above 2.9V. For example, if the charger is *Any external sources that hold the ITERM pin above 100mV will prevent the LTC4097 from terminating a charge cycle. 12 ...
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... NOM a 1% resistor with a value equal to the value of the chosen NTC thermistor at 25°C (R25). The LTC4097 will pause charging when the resistance of the 100k NTC thermistor drops to 0.54 times the value of R25 or approximately 54k (for a Vishay “Curve 1” therm- istor, this corresponds to approximately 40°C). As the temperature drops, the resistance of the NTC thermistor rises ...
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... APPLIED SUSP SUSP DRIVEN HIGH DRIVEN HIGH USBIN POWER DCIN POWER REMOVED OR REMOVED DCIN POWER APPLIED Figure 1. LTC4097 State Diagram of a Charge Cycle TRICKLE CHARGE MODE BAT < 2.9V 1/10th FULL CURRENT CHRG STATE: PULLDOWN BAT > 2.9V CHARGE 2.9V < BAT MODE FULL CURRENT⇒HPWR = HIGH 1/5 FULL CURRENT⇒ ...
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... Example: An LTC4097 operating from a 5V USB adapter (on the USBIN input) is programmed to supply 500mA full-scale current to a discharged Li-Ion battery with a voltage of 3.3V. Assuming θ Considerations), the ambient temperature at which the LTC4097 will begin to reduce the charge current is ap- proximately 115°C – (5V – 3.3V) • (500mA) • 60°C/W A ...
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... LTC4097 APPLICATIONS INFORMATION The LTC4097 can be used above 64°C ambient, but the charge current will be reduced from 500mA. The ap- proximate current at a given ambient temperature can be approximated by: ° 115 C T – BAT θ – V • IN BAT ) JA Using the previous example with an ambient temperature of 75° ...
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... Figure 5. The following formulas can be used to compute the values NOM = 536 . For example, to set the trip points to 0°C and 45°C with a Vishay Curve 1 thermistor choose = R NOM LTC4097 VNTC NTC BLOCK 3 0.765 • VNTC R – NOM 105k TOO_COLD NTC + 6 R1 12.7k – ...
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... Q characteristics of ceramic capacitors can cause substantial ringing which could exceed the maximum voltage ratings and damage the LTC4097. Refer to Linear Technology Application Note 88, entitled “Ceramic Input Capacitors Can Cause Overvoltage Transients” for a detailed discussion of this problem. ...
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... ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE LTC4097 R = 0.115 0.40 ± 0.10 TYP R = 0.05 ...
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... LTC4097 RELATED PARTS PART NUMBER DESCRIPTION LTC3455 Dual DC/DC Converter with USB Power Management and Li-Ion Battery Charger LTC4053 USB Compatible Monolithic Li-Ion Battery Charger LTC4054/LTC4054X Standalone Linear Li-Ion Battery Charger with Integrated Pass Transistor in ThinSOT LTC4055 USB Power Controller and Battery Charger ...