LTC4098 LINER [Linear Technology], LTC4098 Datasheet
LTC4098
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LTC4098 Summary of contents
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... Overvoltage Protection DESCRIPTION TM Adaptive The LTC ® 4098/LTC4098-1 are high effi ciency USB Power- Path controllers and full-featured Li-Ion/Polymer battery chargers. They seamlessly manage power distribution from multiple sources including USB, wall adapter, automotive, Firewire or other high voltage DC/DC converters, and a Li-Ion/Polymer battery. ...
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... TAPE AND REEL LTC4098EPDC#PBF LTC4098EPDC#TRPBF LTC4098EPDC-1#PBF LTC4098EPDC-1#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...
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... ACPR Low Voltage Overvoltage Protection V Overvoltage Protection Threshold OVP V OVGATE Output Voltage OVGATE t OVGATE Time to Reach Regulation RISE Battery Charger V LTC4098 BAT Regulated Output Voltage FLOAT LTC4098-1 BAT Regulated Output Voltage I Constant-Current Mode Charge Current CHG I Battery Drain Current BAT LTC4098/LTC4098-1 l The denotes the specifi ...
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... Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC4098E/LTC4098E-1 are 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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... USB Limited Battery Charge Current vs Battery Voltage 150 125 BUS 100 PROG R = 3.01k CLPROG USB SETTING, BATTERY CHARGER SET FOR 1A 0 4.2 2.7 3.0 3.3 3.6 BATTERY VOLTAGE (V) 40981 G08 3.9 4.2 40981 G03 OUT 600 800 40981 G06 LTC4098 LTC4098-1 3.9 4.2 40981 G09 40981fb 5 ...
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... A Battery Charging Effi ciency vs Battery Voltage with No External Load ( BAT VBUS 100 R = 3.01k CLPROG 5x CHARGING PROG EFFICIENCY I = 0mA VOUT LTC4098 90 1x CHARGING 80 EFFICIENCY 2.7 3.0 3.6 3.3 BATTERY VOLTAGE (V) 40981 G11 V Current vs V Current BUS OUT in Suspend 2.5 ...
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... TEMPERATURE (°C) 100 40981 G22 V BUS 5V/DIV OVGATE 5V/DIV OVP INPUT VOLTAGE STEP 5V/DIV 40981 G24 LTC4098/LTC4098 25°C unless otherwise noted Quiescent Current BUS vs Temperature BUS I = 0μA VOUT 17 5x MODE MODE ...
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... LTC4098/LTC4098-1 TYPICAL PERFORMANCE CHARACTERISTICS OVP Protection Waveform V BUS 5V/DIV OVGATE 5V/DIV OVP INPUT VOLTAGE 5V TO 10V STEP 5V/DIV 500μs/DIV OVSENS Quiescent Current vs Temperature OVSENS –40 – TEMPERATURE (°C) 40981 G28 8 V BUS 5V/DIV OVGATE 5V/DIV ...
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... BAT (Pin 11): Single-Cell Li-Ion Battery Pin. Depending on available power and load, a Li-Ion battery on BAT will either deliver system power charged from the battery charger. The LTC4098 will charge to a maximum voltage of 4.200V. The LTC4098-1 will charge to a maximum voltage of 4.100V. ...
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... ACPR (Pin 19): External Power Source Present Output (Active Low). ACPR indicates that the output of the external should BUS high voltage step-down switching regulator is suitable for use by the LTC4098/LTC4098-1. It should be connected to the gate of an external P-channel MOS transistor whose to source is connected to V BUS to WALL ...
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... BLOCK DIAGRAM LTC4098/LTC4098-1 11 40981fb ...
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... LTC4098/LTC4098-1 OPERATION Introduction The LTC4098/LTC4098-1 are high effi ciency power manage- ment and Li-Ion charger solutions designed to make optimal use of the power available from a variety of sources, while minimizing power dissipation and easing thermal budgeting constraints. The innovative PowerPath architecture ensures that the application is powered immediately after external voltage is applied, even with a completely dead battery by prioritizing power to the application over the battery ...
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... OPERATION LTC4098/LTC4098-1 13 40981fb ...
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... CLPROG I I • h VBUS VBUSQ CLPROG R CLPROG where I is the quiescent current of the LTC4098/ VBUSQ LTC4098- the CLPROG servo voltage in CLPROG current limit the value of the programming CLPROG resistor and h is the ratio of the measured current CLPROG the sample current delivered to CLPROG. Refer ...
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... When high voltage is applied to the external regulator, WALL will rise toward this programmed output voltage. When WALL exceeds approximately 4.3V, ACPR is brought low and the Bat-Track control of the LTC4098/LTC4098-1 overdrives the local V control of the external high voltage step-down C switching regulator ...
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... WALL BUS table of recommended components. Ideal Diode from BAT to V The LTC4098/LTC4098-1 have an internal ideal diode as well as a controller for an external ideal diode. Both the internal and the external ideal diodes are always on and will respond quickly whenever V If the load current increases beyond the power allowed from the switching regulator, additional power will be pulled • ...
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... P-channel MOSFET transistor may be added from BAT The IDGATE pin of the OUT LTC4098/LTC4098-1 drives the gate of the external P-chan- nel MOSFET transistor for automatic ideal diode control. The source of the external P-channel MOSFET should be connected to V and the drain should be connected to OUT BAT ...
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... V (typically 4.1V for the LTC4098 and 4.0V for the RECHRG LTC4098-1). In the event that the safety timer is running when the battery voltage falls below V back to zero. To prevent brief excursions below V from resetting the safety timer, the battery voltage must be below V for more than 1 ...
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... When charge current drops to 1/10th the value programmed by R the CHRG pin is released (Hi-Z). The CHRG pin does not respond to the C/10 threshold if the LTC4098/LTC4098-1 are in V current limit. This prevents false end-of-charge BUS indications due to insuffi ...
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... As the temperature drops, the resistance of the NTC thermistor rises. The LTC4098/ LTC4098-1 are also designed to pause charging when the value of the NTC thermistor increases to 3.25 times the value of R25. For a Vishay curve 1 thermistor, this resistance, 325k, corresponds to approximately 0° ...
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... YES BAT RISING CHRG HIGH-Z THROUGH V RECHRG NO BAT FALLING YES NO THROUGH BAT < V RECHRG V RECHRG YES NO Figure 6. Battery Charger State Diagram LTC4098/LTC4098-1 INHIBIT CHARGING PAUSE EVENT TIMER YES CHRG CURRENTLY Hi-Z NO INDICATE NTC FAULT AT CHRG NO I < C/10 BAT YES CHRG Hi-Z 40981 F06 21 40981fb ...
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... V and V BUS OUT The style and value of capacitors used with the LTC4098/ LTC4098-1 determine several important parameters such as regulator control loop stability and input voltage ripple. Because the LTC4098/LTC4098-1 use a step-down switching power supply from V current waveform contains high frequency components. ...
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... V1 and and OVSENS. If either MN1 V1 WALL OVGATE LTC4098 BUS MN2 OVSENS Figure 7. Dual Input Overvoltage Protection LTC4098/LTC4098-1 to just above the voltage BUS is satisfi ed OUT current limit is satisfi ed. Programming the and WALL from BUS LTC4098/ 40981 F07 40981fb 23 ...
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... FDN372S 30V 45mΩ Reverse Voltage Protection The LTC4098/LTC4098-1 can also be easily protected against the application of reverse voltage, as shown in Figure 8. D1 and R1 are necessary to limit the maximum VGS seen by MP1 during positive overvoltage events. D1’s breakdown voltage must be safely below MP1’s BVGS. The circuit shown in Figure 8 offers forward volt- age protection up to MN1’ ...
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... Primary thermistor bias resistor (see Figure 9a) NOM R1 = Optional temperature range adjustment resistor (see Figure 9b) The trip points for the LTC4098/LTC4098-1’s temperature qualifi cation are internally programmed at 0.349 • NTCBIAS for the hot threshold and 0.765 • NTCBIAS for the cold threshold. ...
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... LTC4098/LTC4098-1 APPLICATIONS INFORMATION Solving these equations for R NTC|COLD results in the following 0.536 • R NTC|HOT NOM and R = 3.25 • R NTC|COLD NOM By setting R equal to R25, the previous equations NOM result 0.536 and r = 3.25. Referencing these HOT COLD ratios to the Vishay Resistance-Temperature Curve 1 chart gives a hot trip point of about 40°C and a cold trip point of about 0° ...
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... LTC4098/LTC4098-1 and all of its external high . frequency components. High frequency currents, such as the input current on the LTC4098/LTC4098-1, tend to fi nd their way on the ground plane along a mirror path directly pin will gener- beneath the incident path on the top of the board. If there ...
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... LTC4098/LTC4098-1 APPLICATIONS INFORMATION Battery Charger Stability Considerations The LTC4098/LTC4098-1’s battery charger contains both a constant-voltage and a constant-current control loop. The constant-voltage loop is stable without any compensation when a battery is connected with low impedance leads. Excessive lead length, however, may add enough series inductance to require a bypass capacitor of at least 1μ ...
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... D1 D2 0805 R3 6.04k 1 OVSENSE 3 15-17 D0-D2 TO μC LTC4098/LTC4098-1 8 CHRG TO μC 4 NTCBIAS R4 100k 5 NTC CLPROG 100k R6 0.1μF 3.01k 0603 LTC4098/LTC4098 0.47μF L2 BOOST 10μ 499k 22μF 100k 8 FB SYNC 3.3μH SYSTEM LOAD OUT 10 IDGATE ...
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... 4.7μF 4 LT3653 I LIM R1 27.4k GND V HVOK WALL ACPR V V BUS C C3 10μF 2 0805 OVGATE 1 OVSENS 3 15-17 LTC4098/LTC4098-1 D0-D2 8 CHRG 4 NTCBIAS 5 NTC CLPROG PROG GND 0.1μF 3.01k 1k 0603 7 C2 0.1μF L1 BOOST 10V 4.7μ SENSE 5 V OUT L2 3.3μ ...
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... PDC Package 20-Lead Plastic UTQFN (3mm × 4mm) (Reference LTC DWG # 05-08-1752 Rev Ø) 0.70 0.05 2.65 0.05 PACKAGE OUTLINE 2.50 REF 3.10 0.05 4.50 0.05 0.55 0.05 3.00 0. 0.05 TYP 2.50 REF 0.127 REF 0.00 – 0.05 LTC4098/LTC4098-1 PIN 1 NOTCH R = 0.20 OR 0.25 45 CHAMFER 1.50 REF 19 20 0.40 0. 2.65 0.10 1.65 0.10 (PDC20) UTQFN 0407 REV Ø 0.25 0. 0.115 0.50 BSC TYP BOTTOM VIEW— ...
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... WALL ACPR V V BUS C C3 10μF 0805 2 R4 OVGATE V 1 OVSENS IDGATE 3 15-17 D0-D2 LTC4098/LTC4098-1 8 CHRG 4 NTCBIAS R5 100k 5 NTC CLPROG PROG GND BATSENS 100k 0.1μF 3.01k 1k 0603 COMMENTS Complete Multifunction PMIC: Switchmode Power Manager and Three Buck Regulators Plus LDO Charge Current Programmable Up to 1.5A from Wall Adapter Input, Synchronous Buck Converters Effi ...