LTC4097EDDB LINER [Linear Technology], LTC4097EDDB Datasheet
LTC4097EDDB
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LTC4097EDDB Summary of contents
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FEATURES Charges Single-Cell Li-Ion/Polymer Battery from ■ Wall Adapter and USB Inputs ■ Automatic Input Detection (Wall Adapter Input has Charging Priority) Charge Current Programmable up to 1.2A from ■ Wall Adapter Input Programmable Charge Current Termination ■ ■ NTC ...
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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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ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are 2kΩ unless otherwise noted. ITERM SYMBOL PARAMETER V Trickle Charge Threshold Voltage V TRIKL V DCIN Undervoltage Lockout UVDC Voltage V USBIN Undervoltage Lockout UVUSB Voltage V V ...
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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 ...
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TYPICAL PERFORMANCE CHARACTERISTICS IDC Pin Voltage vs V DCIN (Constant-Current Mode) 1.006 V = 3.7V BAT R = 10k IDC 1.004 1.002 1.000 0.998 0.996 0.994 4.25 4.50 4.75 5.00 5.25 V (V) DCIN 4097 G10 Charge Current vs Battery ...
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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 6 ...
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TYPICAL PERFORMANCE CHARACTERISTICS HPWR Pin Pulldown Resistance vs Temperature 4.5 4.0 3.5 3.0 2.5 –50 –25 0 TEMPERATURE (°C) Shutdown Supply Current vs Temperature and V 60 SUSP = V USBIN DCIN ...
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LTC4097 PIN FUNCTIONS DCIN (Pin 1): Wall Adapter Input Supply Pin. Provides power to the battery charger. The maximum supply current is 1.2A. This pin should be bypassed with a 1µF capacitor. USBIN (Pin 2): USB Input Supply Pin. Provides ...
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PIN FUNCTIONS IUSB (Pin 9): Charge Current Program for USB Power. The charge current is set by connecting a resistor ground. When charging in constant current mode, this pin servos to 1V. The voltage on this pin can ...
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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 ...
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OPERATION The LTC4097 is designed to effi ciently manage charging a single-cell lithium-ion battery from two separate power sources: a wall adapter and USB power bus. Using the constant-current/constant-voltage algorithm, the charger can deliver up to 1.2A of charge current ...
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LTC4097 OPERATION Programming Charge Termination The charge cycle terminates when the charge current falls below the programmed termination threshold during constant-voltage mode. This threshold is set by connect- ing an external resistor from the ITERM pin to ITERM ...
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OPERATION Manual Shutdown The SUSP pin has a 3.4MΩ pulldown resistor to GND. A logic low enables the charger and a logic high disables it (the pulldown defaults the charger to the charging state). The DCIN input draws 20µA when ...
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LTC4097 OPERATION TRICKLE CHARGE MODE BAT < 2.9V 1/10th FULL CURRENT CHRG STATE: PULLDOWN BAT > 2.9V CHARGE 2.9V < BAT MODE FULL CURRENT CHRG STATE: PULLDOWN I < I BAT TERMINATE IN VOLTAGE MODE STANDBY MODE NO CHARGE CURRENT ...
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APPLICATIONS INFORMATION Using a Single Charge Current Program Resistor In applications where the programmed wall adapter charge current and USB charge current are the same, a single program resistor can be used to set both charge currents. Figure 2 shows ...
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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 – ...
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APPLICATIONS INFORMATION VNTC NTC BLOCK 3 0.765 • VNTC R – NOM 100k NTC + 6 R NTC 100k – 0.349 • VNTC + + – 0.1V Figure 4. Typical NTC Thermistor Circuit and the cold trip point is set ...
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LTC4097 APPLICATIONS INFORMATION the nearest 1% value is 105k 0.536 • 105k – 0.4368 • 100k = 12.6k the nearest 1% value is 12.7k. The fi nal solution is shown in Figure 5 and results in an upper ...
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PACKAGE DESCRIPTION 0.64 ±0.05 (2 SIDES) 0.70 ±0.05 2.55 ±0.05 1.15 ±0.05 PACKAGE OUTLINE 0.25 ± 0.05 0.45 BSC 2.39 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED Information furnished ...
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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 ...