Datasheet LTC4070 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | Li-Ion/Polymer Shunt Battery Charger System |
| Páginas / Página | 16 / 5 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| Revisión | D |
| Formato / tamaño de archivo | PDF / 562 Kb |
| Idioma del documento | Inglés |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. VOH LBO/HBO vs ISOURCE. VOL LBO/HBO vs ISINK
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LTC4070
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. VOH LBO/HBO vs ISOURCE VOL LBO/HBO vs ISINK
2.5 2.5 VCC = 3.7V 2.0 2.0 LBO VCC = 3.1V (V) 1.5 HBO 1.5 OH VCC = VF – 25m (V) – V V OL V CC 1.0 1.0 0.5 0.5 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 10 ISOURCE (mA) ISINK (mA) 4070 G10 4070 G11
Hot Plug Transient, CC = 330µF, Step Response with 800mAHr Power Spectral Density RIN = 81Ω Battery, RIN = 81Ω
35 CC = 10µF, ICC = 1mA, 1Hz Res Bandwidth, Noise = 1.0452mVRMS CH4 = I 30 IN from 10Hz to 100kHz (10mA/DIV) CH4 = IIN (10mA/DIV) CH1 = VIN ) 25 (2V/DIV) CH1 = VIN (2V/DIV) Hz /√ 20 V RMS 15 CH2 = VCC CH2 = VCC (2V/DIV) (2V/DIV) PSD (µ CH3 = VHBO (2V/DIV) 10 CH3 = VHBO (2V/DIV) 5 0 0 1 10 100 1000 10000 100000 4ms/DIV 4070 G13 400ns/DIV 4070 G14 FREQUENCY (Hz) 4070 G12
PIN FUNCTIONS NTCBIAS (Pin 1):
NTC Bias Pin. Connect a resistor from high, the float voltage is reduced. Connect a low drift bias NTCBIAS to NTC, and a thermistor from NTC to GND. resistor from NTCBIAS to NTC and a thermistor from NTC Float NTCBIAS when not in use. Minimize parasitic capaci- to GND. When not in use, connect NTC to VCC. Minimize tance on this pin. parasitic capacitance on this pin.
NTC (Pin 2):
Input to the Negative Temperature Coefficient
ADJ (Pin 3):
Float Voltage Adjust Pin. Connect ADJ to Thermistor Monitoring Circuit. The NTC pin connects to a GND to program 4.0V float voltage. Disconnect ADJ to negative temperature coefficient thermistor which is typi- program 4.1V float voltage. Connect ADJ to VCC to pro- cally co-packaged with the battery to determine the tem- gram 4.2V float voltage. The float voltage is also adjusted perature of the battery. If the battery temperature is too by the NTC thermistor. Rev. D For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. VOH LBO/HBO vs ISOURCE VOL LBO/HBO vs ISINK
2.5 2.5 VCC = 3.7V 2.0 2.0 LBO VCC = 3.1V (V) 1.5 HBO 1.5 OH VCC = VF – 25m (V) – V V OL V CC 1.0 1.0 0.5 0.5 0 0 0 0.5 1.0 1.5 2.0 2.5 3.0 0 2 4 6 8 10 ISOURCE (mA) ISINK (mA) 4070 G10 4070 G11
Hot Plug Transient, CC = 330µF, Step Response with 800mAHr Power Spectral Density RIN = 81Ω Battery, RIN = 81Ω
35 CC = 10µF, ICC = 1mA, 1Hz Res Bandwidth, Noise = 1.0452mVRMS CH4 = I 30 IN from 10Hz to 100kHz (10mA/DIV) CH4 = IIN (10mA/DIV) CH1 = VIN ) 25 (2V/DIV) CH1 = VIN (2V/DIV) Hz /√ 20 V RMS 15 CH2 = VCC CH2 = VCC (2V/DIV) (2V/DIV) PSD (µ CH3 = VHBO (2V/DIV) 10 CH3 = VHBO (2V/DIV) 5 0 0 1 10 100 1000 10000 100000 4ms/DIV 4070 G13 400ns/DIV 4070 G14 FREQUENCY (Hz) 4070 G12
PIN FUNCTIONS NTCBIAS (Pin 1):
NTC Bias Pin. Connect a resistor from high, the float voltage is reduced. Connect a low drift bias NTCBIAS to NTC, and a thermistor from NTC to GND. resistor from NTCBIAS to NTC and a thermistor from NTC Float NTCBIAS when not in use. Minimize parasitic capaci- to GND. When not in use, connect NTC to VCC. Minimize tance on this pin. parasitic capacitance on this pin.
NTC (Pin 2):
Input to the Negative Temperature Coefficient
ADJ (Pin 3):
Float Voltage Adjust Pin. Connect ADJ to Thermistor Monitoring Circuit. The NTC pin connects to a GND to program 4.0V float voltage. Disconnect ADJ to negative temperature coefficient thermistor which is typi- program 4.1V float voltage. Connect ADJ to VCC to pro- cally co-packaged with the battery to determine the tem- gram 4.2V float voltage. The float voltage is also adjusted perature of the battery. If the battery temperature is too by the NTC thermistor. Rev. D For more information www.analog.com 5 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts