Datasheet LT3470A (Analog Devices) - 3

LT3470A
ELECTRICAL CHARACTERISTICS The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 10V, VSHDN = 10V, VBOOST = 15V, VBIAS = 3V unless otherwise specified. PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage ● 4 V Quiescent Current from VIN VSHDN = 0.2V 0.1 0.5 μA VBIAS = 3V, Not Switching ● 10 18 μA VBIAS = 0V, Not Switching 40 55 μA Quiescent Current from Bias VSHDN = 0.2V 0.1 0.5 μA VBIAS = 3V, Not Switching ● 30 60 μA VBIAS = 0V, Not Switching 0.1 1.5 μA FB Comparator Trip Voltage VFB Falling ● 1.228 1.250 1.265 V FB Pin Bias Current (Note 3) VFB = 1V 35 80 nA ● 35 150 nA H-Grade ● 35 225 nA FB Voltage Line Regulation 4V < VIN < 40V 0.0006 0.02 %/V Minimum Switch Off-Time (Note 5) 500 ns Maximum Duty Cycle ● 90 95 % Switch Leakage Current 0.7 1.5 μA Switch VCESAT ISW = 100mA 150 mV Switch VCESAT Without Boost VBOOST = VSW 0.9 1.2 V Switch Top Current Limit VFB = 0V 320 440 560 mA Switch Bottom Current Limit VFB = 0V 280 mA Catch Schottky Drop ISW = 100mA 600 mV Catch Schottky Reverse Leakage VSW = 10V 0.2 2 μA Boost Schottky Drop IBIAS = 50mA 690 775 mV Boost Schottky Reverse Leakage VSW = 10V, VBIAS = 0V 0.2 2 μA Minimum Boost Voltage (Note 4) ● 1.7 2.2 V BOOST Pin Current ISW = 100mA 2.3 5 mA Bias Pin Preload VBOOST = 10V 50 mA SHDN Pin Current VSHDN = 2.5V 1 5 μA SHDN Input Voltage High 2 V SHDN Input Voltage Low 0.2 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings guaranteed over the –40°C to 125°C temperature range. LT3470AH may cause permanent damage to the device. Exposure to any Absolute specifi cations are guaranteed over the –40°C to 150°C temperature range. Maximum Rating condition for extended periods may affect device
Note 3:
Bias current fl ows out of the FB pin. reliability and lifetime.
Note 4:
This is the minimum voltage across the boost capacitor needed to
Note 2:
The LT3470AE is guaranteed to meet performance specifi cations guarantee full saturation of the switch. from 0°C to 85°C. Specifi cations over the –40°C to 85°C operating
Note 5:
This parameter is assured by design and correlation with statistical temperature range are assured by design, characterization and correlation process controls. with statistical process controls. The LT3470AI specifi cations are 3470afb 3