ltc4007eufd-1-trpbf Linear Technology Corporation, ltc4007eufd-1-trpbf Datasheet
ltc4007eufd-1-trpbf
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ltc4007eufd-1-trpbf Summary of contents
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... The FAULT pin is also asserted and charging terminates if the low-battery condition persists for more than 1/4 of the total charge time. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 5723970. ...
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LTC4007 ABSOLUTE MAXIMUM (Note 1) Voltage from DCIN, CLP, CLN to GND ....... + 32V/– 0.3V PGND with Respect to GND ................................. ±0.3V CSP, BAT to GND ....................................... +28V/– 0.3V CHEM, 3C4C GND .............................. +7V/– ...
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ELECTRICAL CHARACTERISTICS temperature range (Note 4), otherwise specifications are at T SYMBOL PARAMETER Current Comparators I and I CMP REV I Maximum Current Sense Threshold (V TMAX I Reverse Current Threshold (V TREV CSP Current Sense Amplifier, CA2 Transconductance Source ...
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LTC4007 ELECTRICAL CHARACTERISTICS temperature range (Note 4), otherwise specifications are at T SYMBOL PARAMETER V Low Logic Level of ACP, CHG, FLAG, LOBAT FAULT CL V High Logic Level of CHG, LOBAT Off State ...
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W U TYPICAL PERFOR A CE CHARACTERISTICS INFET Response Time to Reverse Current V OF PFET (2V/DIV PFET (5V/DIV (REVERSE PFET (5A/DIV ...
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LTC4007 W U TYPICAL PERFOR A CE CHARACTERISTICS Efficiency at 19VDC V 100 16.8V 95 12. 0.50 1.00 1.50 CHARGE CURRENT ( CTIO S DCIN (Pin 1): External DC Power Source ...
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CTIO S ITH (Pin 10): Control Signal of the Inner Loop of the Current Mode PWM. Higher ITH voltage corresponds to higher charging current in normal operation resistor, in series with a capacitor ...
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LTC4007 W BLOCK DIAGRA 0.1µ DCIN 1 5.8V INFET Q3 23 ACP 3 SHDN 24 FAULT 5 FLAG 17 GND 6 3C4C 7 CHEM 16 + LOBAT 8 – 708mV 1.19V 5k CLP Ω – 1.4m ...
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TEST CIRCUIT U OPERATIO Overview The LTC4007 is a synchronous current mode PWM step- down (buck) switcher battery charger controller. The charge current is programmed by the combination of a program resistor (R ) from the PROG pin to ground ...
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LTC4007 U OPERATIO Table 1. Truth Table For Indicator States MODE Shut down by low adapter voltage Charging a low bat Normal charging Input current limited charging Charger paused due to thermistor out of range Shut down by SHDN pin ...
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U OPERATIO The peak inductor current, at which I latch, is controlled by the voltage on ITH. ITH is in turn controlled by several loops, depending upon the situation at hand. The average current control loop converts the voltage between ...
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LTC4007 U OPERATIO the timing resistor connected to R closed to sample the thermistor 127.5 • 20 • R • 17.5pF = 13.8ms, SAMPLE RT for R = 309k RT The external RC network is driven to approximately ...
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U U APPLICATIO S I FOR ATIO Battery Detection It is generally not good practice to connect a battery while the charger is running. The timer unknown state and the charger could provide a large surge current ...
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LTC4007 U U APPLICATIO S I FOR ATIO the full-scale voltage is reduced then 2.49k and R = 26.7k, the maximum charging current is still 2.5A PROG but the FLAG trip point is maintained at 10% ...
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U U APPLICATIO S I FOR ATIO used when tantalum capacitors are used for input or output bypass . High input surge currents can be created when the adapter is hot-plugged to the charger or when a battery is connected ...
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LTC4007 U U APPLICATIO S I FOR ATIO Charger Switching Power MOSFET and Diode Selection Two external power MOSFETs must be selected for use with the charger: a P-channel MOSFET for the top (main) switch and an N-channel MOSFET for ...
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U U APPLICATIO S I FOR ATIO Adapter Limiting An important feature of the LTC4007 is the ability to automatically adjust charging current to a level which avoids overloading the wall adapter. This allows the prod- uct to operate at ...
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LTC4007 U U APPLICATIO S I FOR ATIO LTC4007 R9 NTC 9 C7 Figure 10. General Thermistor Network If you are using a thermistor that doesn’t have a 1:7 HIGH/ LOW ratio, or you wish to set the HIGH/LOW limits ...
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U U APPLICATIO S I FOR ATIO Disabling the Thermistor Function If the thermistor is not needed, connecting a resistor between DCIN and NTC will disable it. The resistor should be sized to provide at least 10µA with the minimum ...
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LTC4007 U U APPLICATIO S I FOR ATIO General Rules 7. Connection of switching ground to system ground or internal ground plane should be single point. If the system has an internal system ground plane, a good way to do ...
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U U APPLICATIO S I FOR ATIO DCIN 0V TO 20V 3A 3C4C V * LOGIC R10 R11 R12 CHEM * 100k 100k 100k LOBAT LOBAT ACP ACP SHDN SHDN FAULT FAULT CHG CHG FLAG FLAG ...
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LTC4007 U U APPLICATIO S I FOR ATIO SWITCH NODE L1 HIGH FREQUENCY CIRCULATING PATH Figure 12. High Speed Switching Path DIRECTION OF CHARGING CURRENT R SENSE CSP BAT Figure 13. Kelvin Sensing ...
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... FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE 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 represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...
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... VID LTC4006 Small, High Efficiency, Fixed Voltage, Lithium-Ion Battery Charger LTC4008 High Efficiency, Programmable Voltage/Current Battery Charger trademark of Linear Technology Corporation. SENSE Linear Technology Corporation 24 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● 12.6V, 4A Li-Ion Battery Charger ...