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LT1769 Datasheet(PDF) 3 Page - Linear Integrated Systems |
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LT1769 Datasheet(HTML) 3 Page - Linear Integrated Systems |
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3 / 16 page  3 LT1769 1769fa ELECTRICAL CHARACTERISTICS The q denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCC = 16V, VBAT = 8V, RS2 = RS3 = 200Ω (see Block Diagram), VCLN = VCC. No load on any outputs unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Overall VCC Undervoltage Lockout (Switch OFF) Threshold Measured at UV Pin q 678 V UV Pin Input Current 0.2V ≤ VUV ≤ 8V q 0.1 5 µA UV Output Voltage at UVOUT Pin In Undervoltage State, IUVOUT = 70µA q 0.1 0.5 V UV Output Leakage Current at UVOUT Pin 8V ≤ VUV, VUVOUT = 5V q 0.1 3 µA Reverse Current from Battery (When VCC Is VBAT ≤ 20V, VUV ≤ 0.4V 3 15 µA Not Connected, VSW Is Floating) Boost Pin Current VCC = 20V, VBOOST = 0V 0.1 10 µA VCC = 28V, VBOOST = 0V 0.25 20 µA 2V ≤ VBOOST – VCC < 8V (Switch ON) 6 9 mA 8V ≤ VBOOST – VCC ≤ 25V (Switch ON) 8 12 mA Switch Switch ON Resistance 8V ≤ VCC ≤ VMAX, ISW = 2A, VBOOST – VSW ≥ 2V q 0.15 0.25 Ω ∆IBOOST/∆ISW During Switch ON VBOOST = 24V, ISW ≤ 2A 25 35 mA/A Switch OFF Leakage Current VSW = 0V, VCC ≤ 20V q 2 100 µA 20V < VCC ≤ 28V q 4 200 µA Minimum IPROG for Switch ON 24 20 µA Minimum IPROG for Switch OFF q 1 2.4 mA Maximum VBAT for Switch ON q VCC – 2 V Current Sense Amplifier CA1 Inputs (Sense, BAT) Input Bias Current q – 50 – 125 µA Input Common Mode Low q – 0.25 V Input Common Mode High q VCC – 2 V SPIN Input Current – 100 – 200 µA Reference Reference Voltage (Note 3) RPROG = 4.93k, Measured at OVP with VA Supplying IPROG and Switch OFF 2.448 2.465 2.477 V Reference Voltage All Conditions of VCC,TA ≥ 0°C q 2.441 2.489 V TA < 0°C (Note 4) q 2.43 2.489 V Oscillator Switching Frequency 180 200 220 kHz Switching Frequency All Conditions of VCC,TA ≥ 0°C q 170 200 230 kHz TA < 0°C q 160 230 kHz Maximum Duty Cycle 90 93 % q 85 % Current Amplifier CA2 Transconductance VC = 1V, IVC = ±1µA 150 250 550 µmho Maximum VC for Switch OFF q 0.6 V IVC Current (Out of Pin) VC ≥ 0.6V 100 µA VC < 0.45V 3 mA |
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