Datasheet LTC4011 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | High Efficiency Standalone Nickel Battery Charger |
| Pages / Page | 26 / 3 — The. indicates specifications which apply over the full operating |
| File Format / Size | PDF / 674 Kb |
| Document Language | English |
The. indicates specifications which apply over the full operating
Model Line for this Datasheet
Text Version of Document
LTC4011 e lecTrical characTerisTics
The
l
indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, BAT = 4.8V, GND = PGND = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Thermistor Termination
VRT Output Voltage RL = 10k 3.075 3.3 3.525 V l 3 3.6 V IRT Short-Circuit Current VRT = 0V l –9 –1 mA
PWM Current Source
VFS BAT – SENSE Full-Scale Regulation 0.3V < BAT < VCC – 0.3V (Note 5) 95 100 105 mV Voltage (Fast Charge) BAT = 4.8V l 95 100 105 mV VPC BAT – SENSE Precharge Regulation Voltage 0.3V < BAT < VCC – 0.3V (Note 5) 16 20 24 mV BAT = 4.8V l 16 20 24 mV VTC BAT – SENSE Top-Off Charge 0.3V < BAT < VCC – 0.3V (Note 5) 6.5 10 13.5 mV Regulation Voltage BAT = 4.8V l 6.5 10 13.5 mV ∆VLI BAT – SENSE Line Regulation 5.5V < VCC < 25V, Fast Charge ±0.3 mV IBAT BAT Input Bias Current 0.3V < BAT < VCC – 0.1V –2 2 mA ISENSE SENSE Input Bias Current SENSE = BAT 50 150 µA IOFF Input Bias Current SENSE or BAT, VCELL = 0V l –1 0 1 µA fTYP Typical Switching Frequency l 460 550 640 kHz fMIN Minimum Switching Frequency l 20 30 kHz DCMAX Maximum Duty Cycle 98 99 % VOL(TG) TGATE Output Voltage Low VCC > 9V, No Load l 5 5.6 8.75 V (VCC – TGATE, Note 7) VCC < 7V, No Load l VCC – 0.5 VCC V VOH(TG) TGATE Output Voltage High VCC – TGATE, No Load l 0 50 mV tR(TG) TGATE Rise Time CLOAD = 3nF, 10% to 90% 35 100 ns tF(TG) TGATE Fall Time CLOAD = 3nF, 10% to 90% 45 100 ns VOL(BG) BGATE Output Voltage Low No Load l 0 50 mV VOH(BG) BGATE Output Voltage High No Load l INTVDD – 0.075 INTVDD V tR(BG) BGATE Rise Time CLOAD = 1.6nF, 10% to 90% 35 80 ns tF(BG) BGATE Fall Time CLOAD = 1.6nF, 10% to 90% 15 80 ns
ADC Inputs
ILEAK Analog Channel Leakage 0V < VCELL < 2V, 550mV < VTEMP < 2V ±100 nA
Charger Thresholds
VBP Battery Present Threshold Voltage l 320 350 370 mV VBOV Battery Overvoltage l 1.815 1.95 2.085 V VMFC Minimum Fast Charge Voltage l 850 900 950 mV VFCBF Fast Charge Battery Fault Voltage l 1.17 1.22 1.27 V ∆VTERM –∆V Termination CHEM OPEN (NiCd) l 16 20 25 mV CHEM = 0V (NiMH) l 6 10 14 mV VAR Automatic Recharge Voltage VCELL Decreasing l 1.260 1.325 1.390 V ∆TTERM ∆T Termination (Note 8) CHEM = 3.3V (NiCd) l 1.3 2 2.7 °C/min CHEM = 0V (NiMH) l 0.5 1 1.5 °C/min TMIN Minimum Charging Temperature (Note 8) VTEMP Increasing l 0 5 9 °C TMAXI Maximum Charge Initiation VTEMP Decreasing, Not Charging l 41.5 45 47 °C Temperature (Note 8) 4011fb Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts
The
l
indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 12V, BAT = 4.8V, GND = PGND = 0V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Thermistor Termination
VRT Output Voltage RL = 10k 3.075 3.3 3.525 V l 3 3.6 V IRT Short-Circuit Current VRT = 0V l –9 –1 mA
PWM Current Source
VFS BAT – SENSE Full-Scale Regulation 0.3V < BAT < VCC – 0.3V (Note 5) 95 100 105 mV Voltage (Fast Charge) BAT = 4.8V l 95 100 105 mV VPC BAT – SENSE Precharge Regulation Voltage 0.3V < BAT < VCC – 0.3V (Note 5) 16 20 24 mV BAT = 4.8V l 16 20 24 mV VTC BAT – SENSE Top-Off Charge 0.3V < BAT < VCC – 0.3V (Note 5) 6.5 10 13.5 mV Regulation Voltage BAT = 4.8V l 6.5 10 13.5 mV ∆VLI BAT – SENSE Line Regulation 5.5V < VCC < 25V, Fast Charge ±0.3 mV IBAT BAT Input Bias Current 0.3V < BAT < VCC – 0.1V –2 2 mA ISENSE SENSE Input Bias Current SENSE = BAT 50 150 µA IOFF Input Bias Current SENSE or BAT, VCELL = 0V l –1 0 1 µA fTYP Typical Switching Frequency l 460 550 640 kHz fMIN Minimum Switching Frequency l 20 30 kHz DCMAX Maximum Duty Cycle 98 99 % VOL(TG) TGATE Output Voltage Low VCC > 9V, No Load l 5 5.6 8.75 V (VCC – TGATE, Note 7) VCC < 7V, No Load l VCC – 0.5 VCC V VOH(TG) TGATE Output Voltage High VCC – TGATE, No Load l 0 50 mV tR(TG) TGATE Rise Time CLOAD = 3nF, 10% to 90% 35 100 ns tF(TG) TGATE Fall Time CLOAD = 3nF, 10% to 90% 45 100 ns VOL(BG) BGATE Output Voltage Low No Load l 0 50 mV VOH(BG) BGATE Output Voltage High No Load l INTVDD – 0.075 INTVDD V tR(BG) BGATE Rise Time CLOAD = 1.6nF, 10% to 90% 35 80 ns tF(BG) BGATE Fall Time CLOAD = 1.6nF, 10% to 90% 15 80 ns
ADC Inputs
ILEAK Analog Channel Leakage 0V < VCELL < 2V, 550mV < VTEMP < 2V ±100 nA
Charger Thresholds
VBP Battery Present Threshold Voltage l 320 350 370 mV VBOV Battery Overvoltage l 1.815 1.95 2.085 V VMFC Minimum Fast Charge Voltage l 850 900 950 mV VFCBF Fast Charge Battery Fault Voltage l 1.17 1.22 1.27 V ∆VTERM –∆V Termination CHEM OPEN (NiCd) l 16 20 25 mV CHEM = 0V (NiMH) l 6 10 14 mV VAR Automatic Recharge Voltage VCELL Decreasing l 1.260 1.325 1.390 V ∆TTERM ∆T Termination (Note 8) CHEM = 3.3V (NiCd) l 1.3 2 2.7 °C/min CHEM = 0V (NiMH) l 0.5 1 1.5 °C/min TMIN Minimum Charging Temperature (Note 8) VTEMP Increasing l 0 5 9 °C TMAXI Maximum Charge Initiation VTEMP Decreasing, Not Charging l 41.5 45 47 °C Temperature (Note 8) 4011fb Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Related Parts
