Datasheet LT1571 (Analog Devices) - 3

LT1571 Series
ELECTRICAL CHARACTERISTICS The
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denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25
°
C. VCC = 16V (LT1571-1, LT1571-2), VCC = 10V (LT1571-5), VBAT = 8V (LT1571-1,LT1571-2), VBAT = 4V (LT1571-5), no load on any outputs unless otherwise noted. (Note 6) PARAMETER CONDITIONS MIN TYP MAX UNITS Overall
Supply Current VPROG = 2.7V ● 5.2 7 mA DC Battery Charging Current, IBAT 8V ≤ VCC ≤ 26V, 0V ≤ VBAT ≤ 20V (LT1571-1) RPROG = 4.93k ● 0.93 1.0 1.07 A RPROG = 4.93k, TJ < 0°C 0.91 1.09 A RPROG = 3.28k ● 1.35 1.5 1.65 A RPROG = 49.3k 75 100 125 mA RPROG = 49.3k, TJ < 0°C 70 130 mA
Shutdown
Auto Shutdown, Reverse Current from Battery VBAT ≤ 20V, 0°C ≤ TJ ≤ 70°C (LT1571-1) 5 15 µA (When Adapter in Figure 1 Circuit is Removed) Shutdown Threshold at VC Pin 40 80 mV When VCC is Connected Shutdown Supply Current VC ≤ 40mV 0.15 0.3 mA
Reference
Reference Voltage (LT1571-1) RPROG = 4.93k. Measured at VFB, with VA Supplying IPROG and Switch Off 8V ≤ VCC ≤ 26V, 0°C ≤ TJ ≤ 70°C 2.446 2.465 2.480 V 8V ≤ VCC ≤ 26V, 0°C ≤ TJ ≤ 125°C 2.441 2.465 2.489 V 8V ≤ VCC ≤ 26V, TJ < 0°C (Note 5) 2.430 2.465 2.480 V
Preset Battery Voltage
LT1571-2: 8.2V/8.4V RPROG = 4.93k. Measured at BAT2 Pin LT1571-5: 4.1V/4.2V TJ = 25°C 0.5 % 8V ≤ VCC ≤ 26V, 0°C ≤ TJ ≤ 125°C – 1 1 % Voltage Setting Resistors Tolerance (R4, R5) Absolute Value, Not Matching –40 40 % BAT2 Pin Input Current (LT1571-2, LT1571-5) VBAT2 = VPRESET – 1V ● 6 µA
Charge Completion Flag (Comparator E6)
Charge Completion Threshold (Note 8) RPROG = 4.93k 0.14 0.20 0.28 A RPROG = 4.93k, RCAP = 65.6k 0.05 0.085 0.13 A Threshold on CAP Pin Low-to-High Threshold 4 4.5 V High-to-Low Threshold 0.6 V FLAG (Open Collector) Output Low VCAP = 4.5V, IFLAG ≤ 1mA ● 0.3 V FLAG Pin Leakage Current VCAP = 0.6V, VCC = 26V ● 3 µA
Voltage Amplifier VA
Transconductance Output Current from 100µA to 500µA 0.3 0.6 2.5 mho Output Source Current VPROG = VREF, VFB = VREF + 10mV 1.3 mA VFB Input Bias Current (LT1571-1) At 0.75mA Output Current ● ±3 ±15 nA
Overall
Minimum Input Operating Voltage Undervoltage Lockout ● 6.2 7 7.8 V Boost Pin Current VCC – VBOOST ≤ 20V ● 0.10 20 µA 20V < VCC – VBOOST ≤ 26V ● 0.25 30 µA 2V ≤ VBOOST – VCC ≤ 8V (Switch ON) ● 6 11 mA 8V < VBOOST – VCC ≤ 20V (Switch ON) (LT1571-1) ● 8 14 mA 3