Datasheet LTC4070 (Analog Devices) - 3

link to page 2 LTC4070
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating junction temperature range. VNTC = VCC, TA = 25°C unless otherwise specified. Current into a pin is positive and current out of a pin is negative. All voltages are referenced to GND unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS High Battery Status
VHBTH HBO Threshold (VFLOAT – VCC) VCC Rising l 15 40 60 mV VHBHY Hysteresis 100 mV
Low Battery Status
VLBTH LBO Threshold VCC Falling l 3.08 3.2 3.34 V VLBHY Hysteresis 220 290 350 mV
Status Outputs HBO/LBO
VOL CMOS Output Low ISINK = 1mA, VCC = 3.7V l 0.5 V VOH CMOS Output High VLBO: VCC = 3.1V, ISOURCE = –100µA l VCC – 0.6 V VHBO: ICC = 1.5mA, ISOURCE = –500µA
3-State Selection Input: ADJ
VADJ ADJ Input Level Input Logic Low Level l 0.3 V Input Logic High Level l VCC – 0.3 V IADJ(Z) Allowable ADJ Leakage Current in l ±3 µA Floating State
NTC
INTC NTC Leakage Current 0V< NTC < VCC –50 0 50 nA INTCBIAS Average NTCBIAS Sink Current Pulsed Duty Cycle < 0.002% 30 pA ∆VFLOAT(NTC) Delta Float Voltage per NTC Comparator ICC = 1mA, NTC Falling Below One of the Step NTCTH Thresholds ADJ = 0V –50 mV ADJ = Float –75 mV ADJ = VCC –100 mV NTCTH1 NTC Comparator Falling Thresholds VNTC as % of VNTCBIAS Amplitude 35.5 36.5 37.5 % NTCTH2 28.0 29.0 30.0 % NTCTH3 21.8 22.8 23.8 % NTCTH4 16.8 17.8 18.8 % NTCHY Hysteresis 30 mV
Drive Output
IDRV(SOURCE) DRV Output Source Current VCC = 3.1V, VDRV = 0V –1 mA IDRV(SINK) DRV Output Sink Current ICC = 1mA, RDRV = 475k (Note 3) 3 µA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings The LTC4070I is guaranteed over the full –40°C to 125°C operating may cause permanent damage to the device. Exposure to any Absolute junction temperature range. Note that the maximum ambient temperature Maximum Rating condition for extended periods may affect device consistent with these specifications is determined by specific operating reliability and lifetime. conditions in conjunction with board layout, the rated package thermal
Note 2:
The LTC4070 is tested under pulsed load conditions such that resistance and other environmental factors. TJ ≈ TA. The LTC4070E is guaranteed to meet performance specifications
Note 3:
The IDRV(SNK) current is tested by pulling the DRV pin up to VCC for junction temperatures from 0°C to 85°C. Specifications over the through a 475k resistor, RDRV. Pulling the DRV pin up to VCC with low –40°C to 125°C operating junction temperature range are assured by impedance disables the regulator. design, characterization and correlation with statistical process controls. Rev. D For more information www.analog.com 3 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