Datasheet LT1769 (Analog Devices) - 3

LT1769
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = 16V, VBAT = 8V, RS2 = RS3 = 200
Ω
(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 ● 6 7 8 V UV Pin Input Current 0.2V ≤ VUV ≤ 8V ● 0.1 5 µA UV Output Voltage at UVOUT Pin In Undervoltage State, IUVOUT = 70µA ● 0.1 0.5 V UV Output Leakage Current at UVOUT Pin 8V ≤ VUV, VUVOUT = 5V ● 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 ● 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 ● 2 100 µA 20V < VCC ≤ 28V ● 4 200 µA Minimum IPROG for Switch ON 2 4 20 µA Minimum IPROG for Switch OFF ● 1 2.4 mA Maximum VBAT for Switch ON ● VCC – 2 V
Current Sense Amplifier CA1 Inputs (Sense, BAT)
Input Bias Current ● – 50 – 125 µA Input Common Mode Low ● – 0.25 V Input Common Mode High ● 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 ● 2.441 2.489 V TA < 0°C (Note 4) ● 2.43 2.489 V
Oscillator
Switching Frequency 180 200 220 kHz Switching Frequency All Conditions of VCC, TA ≥ 0°C ● 170 200 230 kHz TA < 0°C ● 160 230 kHz Maximum Duty Cycle 90 93 % ● 85 %
Current Amplifier CA2
Transconductance VC = 1V, IVC = ±1µA 150 250 550 µmho Maximum VC for Switch OFF ● 0.6 V IVC Current (Out of Pin) VC ≥ 0.6V 100 µA VC < 0.45V 3 mA 1769fa 3