Datasheet LT1505 (Analog Devices) - 3

LT1505
ELECTRICAL CHARACTERISTICS The
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denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = 18V, VBAT = 12.6V, VCLN = VCC (LT1505), no load on any outputs unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Preset Battery Voltage (12.3V, 16.4V, 12.6V, 16.8V)
All Preset Battery Voltages Measured at BAT2 Pin 0.5 % Preset Battery Voltage Tolerance (VBAT + 0.3V) ≤ VCC ≤ 24V ● –1 1 % BAT2 Pin Input Current VBAT2 = VPRESET – 1V ● 6 µA Voltage Setting Resistors Tolerance (R4, R5, R6, R7) – 40 40 %
Shutdown
Undervoltage Lockout (TGATE and BGATE “Off”) Measured at UV Pin ● 6.3 6.7 7.25 V Threshold (Note 9) UV Pin Input Current 0V ≤ VUV ≤ 8V ● – 1 5 µA Reverse Current from Battery in Micropower VBAT ≤ 20V, VUV ≤ 0.4V, 10 50 µA Shutdown (Note 10) VCC = VSW = Battery Voltage Shutdown Threshold at SHDN Pin When VCC ● 1 2 V is Connected SHDN Pin Current 0V ≤ VSHDN ≤ 3V 8 µA Supply Current in Shutdown VCC ≤ 24V 15 20 mA (VSHDN is Low, VCC is Connected) Minimum IPROG for Switching “On” – 1 – 4 – 22 µA Minimum IPROG for Switching “Off” at VPROG ≤ 1V ● – 1 – 2.4 mA
Current Sense Amplifier CA1 Inputs (SENSE, BAT)
Input Bias Current (SENSE, BAT) VSHDN = High ● – 50 – 120 µA VSHDN = Low (Shutdown) – 10 µA Input Common Mode Low ● – 0.25 V Input Common Mode High ● VCC – 0.3 V SPIN Input Current VSHDN = High, VSPIN ≥ 2V (Note 8) ● 2 mA VSHDN = Low (Shutdown) 10 µA
Oscillator
Switching Frequency (fNOM) 180 200 220 kHz Switching Frequency Tolerance ● 170 200 230 kHz SYNC Pin Input Current VSYNC = 0V – 0.5 mA VSYNC = 2V – 30 µA Synchronization Pulse Threshold on SYNC Pin 0.9 1.2 2.0 V Synchronization Frequency ● 240 280 kHz
Maximum Duty Cycle
VBOOST Threshold to Turn TGATE Off Measured at (VBOOST – VSW) (Comparator A2) (Note 4) Low to High ● 6.8 7.3 7.6 V Hysteresis 0.25 V Maximum Duty Cycle of Natural Frequency 200kHz ● 85 90 % (Note 5)
Current Amplifier CA2
Transconductance VC = 1V, IVC = ±1µA 150 200 300 µmho Maximum VC for Switch Off ● 0.6 V IVC Current (Out of Pin) VC ≥ 0.6V ● 50 µA VC < 0.45V ● 3 mA VC at Shutdown VSHDN = Low (Shutdown) ● 0.35 V 1505fc 3