Datasheet LT3494, LT3494A (Analog Devices) - 3

LT3494/LT3494A
ELECTRICAL CHARACTERISTICS The
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denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VCC = 3V, VSHDN = VCC, unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
CTRL Pin Bias Current VCTRL = 0.5V, Current Flows Out of Pin ● 20 100 nA CTRL to FB Offset VCTRL = 0.5V 8 15 mV Maximum Shunt Current VFB = 1.3V, VCAP = 5V 230 μA
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
Internal reference voltage is determined by fi nding VFB voltage may cause permanent damage to the device. Exposure to any Absolute level which causes quiescent current to increase 20μA above “Not Maximum Rating condition for extended periods may affect device Switching” level. reliability and lifetime.
Note 4:
If CTRL is overriding the internal reference, Start-Up mode occurs
Note 2:
The LT3494/LT3494A are guaranteed to meet performance when VFB is less then half the voltage on CTRL. If CTRL is not overriding specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C the internal reference, Start-Up mode occurs when VFB is less then half the operating temperature range are assured by design, characterization and voltage of the internal reference. correlation with statistical process controls.
Note 5:
Current limit guaranteed by design and/or correlation to static test.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C unless otherwise noted. Switching Frequency vs Load Currrent Load Regulation VOUT vs CTRL Voltage
1400 2.0 20 LT3494 LT3494 LT3494 FIGURE 5 CIRCUIT FIGURE 5 CIRCUIT FIGURE 5 CIRCUIT 1200 1.5 VCC = 3.6V VCC = 3.6V VCC = 3.6V VOUT = 16V 1.0 VOUT = 16V 15 VOUT = 16V 1000 LOAD CURRENT = 1mA 0.5 800 0 10 600 VOLTAGE (V) –0.5 VOLTAGE CHANGE (%) OUTV 400 OUT –1.0 5 V SWITCHING FREQUENCY (kHz) 200 –1.5 0 –2.0 0 0.1 1 10 100 0 5 10 15 20 25 30 35 40 0.1 0.3 0.5 0.7 0.9 1.1 1.3 1.5 LOAD CURRENT (mA) LOAD CURRENT (mA) CTRL VOLTAGE (V) 3494 G01 3494 G02 3494 G03 3494fb 3