Datasheet LTC4123 (Analog Devices) - 3
| Manufacturer | Analog Devices |
| Description | Low Power Wireless Charger for Hearing Aids |
| Pages / Page | 18 / 3 — elecTrical characTerisTics. The. denotes the specifications which apply … |
| File Format / Size | PDF / 1.1 Mb |
| Document Language | English |
elecTrical characTerisTics. The. denotes the specifications which apply over the specified operating
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LTC4123
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VACIN = 0V, VCC = 5V unless otherwise noted (Notes 2, 3, 4). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Thermal Sensing
Cold Temperature Fault Threshold Die Temperature Falling –5 °C Hysteresis 5 °C Hot Temperature Fault Threshold Die Temperature Rising 70 °C Hysteresis 5 °C
Zinc-Air Battery Detection
VZn-AIR Zinc-Air Fault Threshold Voltage VBAT Rising 1.60 1.65 V Hysteresis 40 mV TZn-AIR Zinc-Air Detection Period 80 s Charge Voltage Limit During Zinc-Air Battery Detection 1.8 V Zinc-Air Detection Charge Current RPROG = 23.7kΩ 1 mA
Reverse Polarity Detection
VREVPOL Reverse Polarity Threshold Voltage VBAT Falling –50 mV Hysteresis 40 mV
AC Rectification
VCC(HIGH) VCC High Voltage Limit VCC Rising 5 V VCC(LOW) VCC Low Voltage Limit VCC Falling 3 V ACIN to VCC Voltage Drop IVCC = –20mA, Charger Terminated 0.65 V
Status Pin (CHRG)
ICHRG CHRG Pin Pull-Down Current VCHRG = 450mV 250 340 430 µA CHRG Leakage Current CHRG = 5V 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings impedance and other environmental factors. The junction temperature may cause permanent damage to the device. Exposure to any Absolute (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and Maximum Rating condition for extended periods may affect device power dissipation (PD, in Watts) according to the following formula: reliability and lifetime. TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal
Note 2:
The LTC4123 is tested under conditions such that TJ ≈ TA. The impedance. LTC4123E is guaranteed to meet specifications from 0°C to 85°C junction
Note 3:
All currents into pins are positive; all voltages are referenced to temperature. Specifications over the –20°C to 85°C operating junction GND unless otherwise noted. temperature are assured by design, characterization and correlation with
Note 4:
These parameters are guaranteed by design and are not 100% statistical process controls. Note that the maximum ambient temperature tested. The battery charge voltage variation over temperature is guaranteed consistent with these specifications is determined by specific operating in a ±15mV band as shown in the Typical Performance Characteristics curve. conditions in conjunction with board layout, the rated package thermal 4123fa For more information www.linear.com/LTC4123 3
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C. VACIN = 0V, VCC = 5V unless otherwise noted (Notes 2, 3, 4). SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Thermal Sensing
Cold Temperature Fault Threshold Die Temperature Falling –5 °C Hysteresis 5 °C Hot Temperature Fault Threshold Die Temperature Rising 70 °C Hysteresis 5 °C
Zinc-Air Battery Detection
VZn-AIR Zinc-Air Fault Threshold Voltage VBAT Rising 1.60 1.65 V Hysteresis 40 mV TZn-AIR Zinc-Air Detection Period 80 s Charge Voltage Limit During Zinc-Air Battery Detection 1.8 V Zinc-Air Detection Charge Current RPROG = 23.7kΩ 1 mA
Reverse Polarity Detection
VREVPOL Reverse Polarity Threshold Voltage VBAT Falling –50 mV Hysteresis 40 mV
AC Rectification
VCC(HIGH) VCC High Voltage Limit VCC Rising 5 V VCC(LOW) VCC Low Voltage Limit VCC Falling 3 V ACIN to VCC Voltage Drop IVCC = –20mA, Charger Terminated 0.65 V
Status Pin (CHRG)
ICHRG CHRG Pin Pull-Down Current VCHRG = 450mV 250 340 430 µA CHRG Leakage Current CHRG = 5V 1 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings impedance and other environmental factors. The junction temperature may cause permanent damage to the device. Exposure to any Absolute (TJ, in °C) is calculated from the ambient temperature (TA, in °C) and Maximum Rating condition for extended periods may affect device power dissipation (PD, in Watts) according to the following formula: reliability and lifetime. TJ = TA + (PD • θJA), where θJA (in °C/W) is the package thermal
Note 2:
The LTC4123 is tested under conditions such that TJ ≈ TA. The impedance. LTC4123E is guaranteed to meet specifications from 0°C to 85°C junction
Note 3:
All currents into pins are positive; all voltages are referenced to temperature. Specifications over the –20°C to 85°C operating junction GND unless otherwise noted. temperature are assured by design, characterization and correlation with
Note 4:
These parameters are guaranteed by design and are not 100% statistical process controls. Note that the maximum ambient temperature tested. The battery charge voltage variation over temperature is guaranteed consistent with these specifications is determined by specific operating in a ±15mV band as shown in the Typical Performance Characteristics curve. conditions in conjunction with board layout, the rated package thermal 4123fa For more information www.linear.com/LTC4123 3
