Datasheet LTC4020 (Analog Devices) - 4

LTC4020
e lecTrical characTerisTics The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). PVIN = SENSVIN = CSP = CSN = BAT = 20V, SHDN = 2V, C(TG1, BG1, TG2, BG2) = 1000pF, VRNG/SS = 2V. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Battery Charger
VBAT Charger Output Voltage Range l 55 V VFB Float Reference CC/CV Charging (MODE = 0V) 2.4875 2.5 2.5125 V l 2.475 2.525 V Auto Recharge Voltage % of Float Reference l 96.5 97.5 98.5 % Precondition Threshold (Rising) % of Float Reference l 68 70 72 % Precondition Hysteresis 85 mV Absorption Reference Lead-Acid Charging (MODE = INTVCC) 2.4875 2.5 2.5125 V % of Absorption Reference l 2.475 2.525 V Float Reference % of Absorption Reference l 91.5 92.5 93.5 % Bulk Charge Threshold (Falling) % of Absorption Reference l 86 87.5 89 % Precondition Threshold (Rising) l 68 70 72 % Precondition Hysteresis 85 mV Voltage Reference CC Charging (MODE = - NC -) 2.4875 2.5 2.5125 V l 2.475 2.525 V VIN_REG Input Regulation Reference % of Float (CC/CV), Safety (CC), or l 98 100 102 % Absorption (LA) Reference VFBMIN Instant-On Reference % of Float (CC/CV) or Absorption (LA) l 84 85 86 % Reference C/10 Detection Enable (Rising) 2.175 V Hysteresis (Falling) 20 mV Instant-On Charge Current Reduction VCSN – VBAT; Note 4 0.45 V Threshold C/10 Detection Enable VCSN – VBAT Falling 1.05 V C/10 Detection Hysteresis VCSN – VBAT Rising 150 mV Charge Current Reduction Gain ΔVCS(MAX)/Δ(VCSN – VBAT);Note 4 –33 mV/V IBATQ Battery Bias Currents with PowerPath ICSP + ICSN + IBAT l 9 18 µA Switcher Disabled CSN, CSP Charger Current Sense Pin Operating Bias ICSP = ICSN; Charging Enabled 40 µA Currents Charger Current Sense Limit Voltage VCSP – VCSN l 47.5 50 52.5 mV Charger Current Sense Termination Voltage VCSP – VCSN; MODE = 0V l 3 5 7 mV (C/10) Charger Current Sense Precondition Voltage VCSP – VCSN; VFB = 1.5 l 1.5 3 4.5 mV Sense Input UVLO VCSP Rising (Charging Enabled) l 1.6 1.75 1.9 V UVLO Hysteresis VCSP Falling (Charging Disabled) 100 mV CSOUT Offset VCSP = VCSN l 0.225 0.25 0.290 V Gain ΔVCSOUT / Δ(VCSP – VCSN) l 19 20 21 V/V RNG/SS Current Limit Programming VRNG/SS = 0.5V; VRNG/SS/VCS(MAX) l 18 20 22 V/V NTC NTC Range Limit (High) VNTC Rising l 1.30 1.35 1.40 V NTC Range Limit (Low) VNTC Falling l 0.27 0.3 0.33 V NTC Range Hysteresis % of VNTC(H,L) 20 % INTC NTC Pin Bias Current VNTC = 0.8V l 47.5 50 52.5 µA NTC Disable Current INTC Pin Current (Falling) 3.5 µA NTC Disable Current Hysteresis 2 µA VBGATE Gate Clamp Voltage VCSN – VBGATE l 7 9.5 12 V C/10 Detection Enable (Falling) VCSN < 7V 0.425 V C/10 Detection Enable Hysteresis 0.125 V 4020fd 4 For more information www.linear.com/LTC4020 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Electrical Characteristics Pin Configuration Electrical Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts