LTC4088-1_12 LINER [Linear Technology], LTC4088-1_12 Datasheet
LTC4088-1_12
Related parts for LTC4088-1_12
LTC4088-1_12 Summary of contents
Page 1
... USB applications, the LTC4088-1/ LTC4088-2’s switching regulator automatically limits its input current to either 100mA, 500mA or 1A via logic control. The LTC4088-1 powers-up with the charger off; the LTC4088-2 powers-up with the charger on. The switching input stage provides power to V power sharing between the application circuit and the battery charger is managed ...
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... TAPE AND REEL LTC4088EDE-1#PBF LTC4088EDE-1#TRPBF LTC4088EDE-2#PBF LTC4088EDE-2#TRPBF Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on nonstandard lead based finish parts. For more information on lead free part markings, go to: For more information on tape and reel specifications, go to: ...
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... C/X Threshold Voltage C/X h Battery Charge Current Ratio to C/X C/X CHRG Pin Output Low Voltage V CHRG I CHRG Pin Input Current CHRG LTC4088-1/LTC4088-2 The denotes the specifications which apply over the full operating l = 25° 5V, BAT = 3.8V BUS CLPROG CONDITIONS 1x Mode, BAT = 3.3V 5x Mode, BAT = 3.3V 10x Mode, BAT = 3 ...
Page 4
... Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC4088E-1/LTC4088E-2 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the – 40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls ...
Page 5
... R = 2.94k CLPROG PROG I = 0mA OUT 88 5x CHARGING EFFICIENCY 86 1x CHARGING 84 EFFICIENCY 2.7 3.0 3.3 3.6 3.9 BATTERY VOLTAGE (V) LTC4088-1/LTC4088 25°C, unless otherwise noted. A Output Voltage vs Output Current (Battery Charger Disabled) 4. BAT 4.25 4. 3.4V BAT 3.75 3.50 3.25 4.2 0 200 400 600 OUTPUT CURRENT (mA) 408812 G02 Battery Drain Current ...
Page 6
... LTC4088-1/LTC4088-2 Typical perForMance characTerisTics Output Voltage vs Output Current in Suspend 5.0 5x MODE 4.5 4.0 3.5 1x MODE 3 BUS V = 3.3V BAT R = 2.94k CLPROG 2.5 0 0.5 1 1.5 2 OUTPUT CURRENT (mA) 408812 G10 Battery Charge Current vs Temperature 600 PROG 500 400 THERMAL REGULATION 300 200 100 –40 – 100 TEMPERATURE (° ...
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... D2 (Pin 4): Mode Select Input Pin. D2, in combination with the D0 pin and D1 pin, controls the current limit and bat- tery charger functions of the LTC4088-1/LTC4088-2. The LTC4088-1 and LTC4088-2 differ only in the functionality of the D2 pin default ( state (see Table 1). This pin is pulled low by a weak current sink. ...
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... D0 (Pin 13): Mode Select Input Pin. D0, in combina- tion with the D1 pin and the D2 pin, controls the current limit and battery charger functions of the LTC4088-1/ LTC4088-2 (see Table 1). This pin is pulled low by a weak current sink. D1 (Pin 14): Mode Select Input Pin. D1, in combination ...
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... DiagraM LTC4088-1/LTC4088-2 40881fc 9 ...
Page 10
... USB power. Because power is conserved, the LTC4088-1/ LTC4088-2 allows the load current on V current drawn by the USB port without exceeding the USB load specifications. The switching regulator and battery charger communicate to ensure that the average input current never exceeds the USB specifications ...
Page 11
... CLPROG • h VBUS BUSQ CLPROG R CLPROG where I is the quiescent current of the LTC4088-1/ BUSQ LTC4088- 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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... At higher current levels, the MOSFET will be in full conduction. An external P-channel MOSFET transistor should be added from BAT The GATE pin of the LTC4088-1/LTC4088-2 drives OUT the gate of the external P-channel MOSFET transistor for automatic ideal diode control. The source of the external ...
Page 13
... RECHRG croprocessor. An open-drain output, the CHRG pin can drive an indicator LED through a current limiting resistor , it will reset RECHRG for human interfacing or simply a pull-up resistor for RECHRG microprocessor interfacing. LTC4088-1/LTC4088-2 UVLO cycles low BUS is removed and then replaced) BUS 1031V 1031V = ...
Page 14
... When charg- ing is complete, as determined by the criteria set by the C/X pin, the CHRG pin is released (Hi-Z). The CHRG pin does not respond to the C/X threshold if the LTC4088-1/ LTC4088 current limit. This prevents false end BUS of charge indications due to insufficient power available to the battery charger ...
Page 15
... NTC thermistor at 25°C (R25). A 100k thermistor is recommended since thermistor current is not measured by the LTC4088-1/ LTC4088-2 and will have to be considered for USB com- pliance. The LTC4088-1/LTC4088-2 will pause charging when the resistance of the NTC thermistor drops to 0.54 times the value of R25 or approximately 54k (for a Vishay “ ...
Page 16
... If the input current is less than 100mA, the measurement accuracy may be reduced, but it does not affect the average current loop since it will not be in regulation. The LTC4088-1/LTC4088-2 includes a current-reversal comparator which monitors inductor current and disables 16 the synchronous rectifier as current approaches zero. ...
Page 17
... Table 3. Recommended Inductors for the LTC4088-1/LTC4088-2 INDUCTOR TYPE LPS4018 D53LC DB318C WE-TPC Type M1 CDRH6D12 CDRH6D38 V and V Bypass Capacitors BUS OUT The style and value of capacitors used with the LTC4088-1/LTC4088-2 determine several important parameters such as regulator control-loop stability and input voltage ripple ...
Page 18
... R = Primary thermistor bias resistor (see Figure 4a) NOM Optional temperature range adjustment resistor (see Figure 4b) The trip points for the LTC4088-1/LTC4088-2’s tempera- ture qualification are internally programmed at 0.349 • V for the hot threshold and 0.765 • V BUS threshold. Therefore, the hot trip point is set when: ...
Page 19
... USB Inrush Limiting The USB specification allows at most 10µF of downstream capacitance to be hot-plugged into a USB hub. In most LTC4088-1/LTC4088-2 applications, 10µF should be enough to provide adequate filtering on V capacitance is required, the following circuit can be used to soft-connect additional capacitance. ...
Page 20
... Board Layout Considerations The Exposed Pad on the backside of the LTC4088-1/ LTC4088-2 package must be securely soldered to the PC board ground. This is the only ground pin in the pack- age, and it serves as the return path for both the control circuitry and the synchronous rectifier ...
Page 21
... Battery Charger Stability Considerations The LTC4088-1/LTC4088-2’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 ...
Page 22
... LTC4088-1/LTC4088-2 package DescripTion Please refer to http://www.linear.com/designtools/packaging/ 3.60 ±0.05 2.20 ±0.05 1.70 ±0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 4.00 ±0.10 PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WGED-3) IN JEDEC PACKAGE OUTLINE MO-229 2 ...
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... Clarified thermistor part number. Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. LTC4088-1/LTC4088-2 PAGE NUMBER 5 18, 21 ...
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