Datasheet LTC4126 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | 7.5mA Wireless Li-Ion Charger with 1.2V Step-Down DC/DC Converter |
| Pages / Page | 22 / 3 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| File Format / Size | PDF / 2.3 Mb |
| Document Language | English |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the specified operating
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LTC4126
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 3). VACIN = VCC = 5V, VBAT = 3.8V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS AC Rectification
VCC(HIGH) VCC High Voltage Limit VCC Rising 5.25 5.5 5.75 V VCC(LOW) VCC Low Voltage Limit VCC Falling 4.75 5 5.25 V ACIN to VCC Voltage Drop 7.5mA from ACIN to VCC 0.6 V
Battery Charger
VCHG Battery Charge Voltage VSEL = 0 l 4.158 4.200 4.242 V VSEL = 1 l 4.306 4.350 4.394 V VCC(LOW) – VCHG VSEL = 1 50 150 250 mV ICHG Battery Charge Current 7.0 7.5 8.0 mA l 6.5 7.5 8.5 mA ΔVUVLO VCC-to-VBAT Differential Undervoltage Lockout VCC Falling 9 27 45 mV Threshold (Indicated at ACPR Pin) VCC Rising 55 80 105 mV ΔVUVCL VCC-to-VBAT Differential Undervoltage Current IBAT = 0.9 • ICHG 150 mV Limit Threshold Voltage IBAT = 0.1 • ICHG 120 mV IDUVCL Charge Current Threshold for DUVCL Fault (VCC – VBAT) Falling 3.1 mA Indication (VCC – VBAT) Rising 4.5 mA VRECHRG Recharge Battery Threshold Voltage As a Percentage of VCHG 96.5 97.5 98.5 % tTERMINATE Safety Timer Termination Period Timer Starts at the Beginning of the 5.1 6 6.9 hours Charge Cycle, VCC > (VBAT + 100mV) fSLOW Slow Blink Frequency 1.14 Hz fFAST Fast Blink Frequency 4.58 Hz VCOLD Cold Temperature Fault Threshold Voltage Rising Threshold Voltage 75.0 76.5 78 %VCC Hysteresis 1.5 %VCC VHOT Hot Temperature Fault Threshold Voltage Falling Threshold Voltage 33.4 34.9 36.4 %VCC Hysteresis 1.5 %VCC VDIS NTC Disable Threshold Voltage 150 250 mV INTC NTC Leakage Current VNTC = 2.5V –100 100 nA VNTC = 0V –150 nA
Step-Down DC/DC Regulator
VOUT DC/DC Regulator Output Voltage VBAT > VLOBAT1 or VDISCONNECT < VBAT < l 1.16 1.2 1.24 V VLOBAT2, IOUT = 0 VLOBAT2 < VBAT < VLOBAT1, IOUT = 0 VBAT/3 V VLOBAT1 Low Battery Alert 1 Threshold VBAT Falling l 3.52 3.6 3.68 V Hysteresis 100 mV VLOBAT2 Low Battery Alert 2 Threshold VBAT Falling l 3.22 3.3 3.38 V Hysteresis 100 mV VLOBAT3 Low Battery Alert 3 Threshold VBAT Falling l 3.12 3.2 3.28 V Hysteresis 100 mV VDISCONNECT Low Battery Disconnect Threshold Voltage VBAT Falling l 2.93 3.0 3.07 V fSW DC/DC Switching Frequency 3:1 Mode (VBAT > VLOBAT2) l 40 50 60 kHz 2:1 Mode (VBAT < VLOBAT2) l 60 75 90 kHz ROL Effective Open-Loop Output Resistance (Note 4) VBAT = 3.5V, IOUT = 3mA 4.6 6.5 Ω ILIM OUT Current Limit VOUT = 0V 80 mA Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Notes 2, 3). VACIN = VCC = 5V, VBAT = 3.8V, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS AC Rectification
VCC(HIGH) VCC High Voltage Limit VCC Rising 5.25 5.5 5.75 V VCC(LOW) VCC Low Voltage Limit VCC Falling 4.75 5 5.25 V ACIN to VCC Voltage Drop 7.5mA from ACIN to VCC 0.6 V
Battery Charger
VCHG Battery Charge Voltage VSEL = 0 l 4.158 4.200 4.242 V VSEL = 1 l 4.306 4.350 4.394 V VCC(LOW) – VCHG VSEL = 1 50 150 250 mV ICHG Battery Charge Current 7.0 7.5 8.0 mA l 6.5 7.5 8.5 mA ΔVUVLO VCC-to-VBAT Differential Undervoltage Lockout VCC Falling 9 27 45 mV Threshold (Indicated at ACPR Pin) VCC Rising 55 80 105 mV ΔVUVCL VCC-to-VBAT Differential Undervoltage Current IBAT = 0.9 • ICHG 150 mV Limit Threshold Voltage IBAT = 0.1 • ICHG 120 mV IDUVCL Charge Current Threshold for DUVCL Fault (VCC – VBAT) Falling 3.1 mA Indication (VCC – VBAT) Rising 4.5 mA VRECHRG Recharge Battery Threshold Voltage As a Percentage of VCHG 96.5 97.5 98.5 % tTERMINATE Safety Timer Termination Period Timer Starts at the Beginning of the 5.1 6 6.9 hours Charge Cycle, VCC > (VBAT + 100mV) fSLOW Slow Blink Frequency 1.14 Hz fFAST Fast Blink Frequency 4.58 Hz VCOLD Cold Temperature Fault Threshold Voltage Rising Threshold Voltage 75.0 76.5 78 %VCC Hysteresis 1.5 %VCC VHOT Hot Temperature Fault Threshold Voltage Falling Threshold Voltage 33.4 34.9 36.4 %VCC Hysteresis 1.5 %VCC VDIS NTC Disable Threshold Voltage 150 250 mV INTC NTC Leakage Current VNTC = 2.5V –100 100 nA VNTC = 0V –150 nA
Step-Down DC/DC Regulator
VOUT DC/DC Regulator Output Voltage VBAT > VLOBAT1 or VDISCONNECT < VBAT < l 1.16 1.2 1.24 V VLOBAT2, IOUT = 0 VLOBAT2 < VBAT < VLOBAT1, IOUT = 0 VBAT/3 V VLOBAT1 Low Battery Alert 1 Threshold VBAT Falling l 3.52 3.6 3.68 V Hysteresis 100 mV VLOBAT2 Low Battery Alert 2 Threshold VBAT Falling l 3.22 3.3 3.38 V Hysteresis 100 mV VLOBAT3 Low Battery Alert 3 Threshold VBAT Falling l 3.12 3.2 3.28 V Hysteresis 100 mV VDISCONNECT Low Battery Disconnect Threshold Voltage VBAT Falling l 2.93 3.0 3.07 V fSW DC/DC Switching Frequency 3:1 Mode (VBAT > VLOBAT2) l 40 50 60 kHz 2:1 Mode (VBAT < VLOBAT2) l 60 75 90 kHz ROL Effective Open-Loop Output Resistance (Note 4) VBAT = 3.5V, IOUT = 3mA 4.6 6.5 Ω ILIM OUT Current Limit VOUT = 0V 80 mA Rev. 0 For more information www.analog.com 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts
