Datasheet LTC3129-1 (Analog Devices) - 3

LTC3129-1
e lecTrical characTerisTics The
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denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). Unless otherwise noted, VIN = 12V, VOUT = 5V. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Start-Up Voltage l 2.25 2.42 V Input Voltage Range VCC > 2.42V (Back-Driven) l 1.92 15 V VIN UVLO Threshold (Rising) VCC > 2.42V (Back-Driven) l 1.8 1.9 2.0 V VIN UVLO Hysteresis l 80 100 130 mV VOUT Voltages VS1 = VS2 = VS3 = 0V l 2.425 2.5 2.575 V VS1 = VCC, VS2 = VS3 = 0V l 3.2175 3.3 3.383 V VS2 = VCC, VS1 = VS3 = 0V l 3.998 4.1 4.203 V VS1 = VS2 = VCC, VS3 = 0V l 4.875 5.0 5.125 V VS1 = VS2 = 0V, VS3 = VCC l 6.727 6.9 7.073 V VS2 = 0V, VS1 = VS3 = VCC l 7.995 8.2 8.405 V VS1 = 0V, VS2 = VS3 = VCC l 11.64 12 12.40 V VS1 = VS2 = VS3 = VCC l 14.50 15.0 15.50 V Quiescent Current (VIN) – Shutdown RUN = 0V, Including Switch Leakage 10 100 nA Quiescent Current (VIN) UVLO Either VIN or VCC Below Their UVLO Threshold, or 1.9 3 µA RUN Below the Threshold to Enable Switching Quiescent Current – Burst Mode Operation Measured on VIN, VOUT > VREG 1.3 2.0 µA PWM = 0V, RUN = VIN N-Channel Switch Leakage on VIN and VOUT SW1 = 0V, VIN = 15V 10 50 nA SW2 = 0V, VOUT = 15V RUN = 0V N-Channel Switch On-Resistance VCC = 4V 0.75 Ω Inductor Average Current Limit VOUT > UV Threshold (Note 4) l 220 275 350 mA VOUT < UV Threshold (Note 4) l 80 130 200 mA Inductor Peak Current Limit (Note 4) l 400 500 680 mA Maximum Boost Duty Cycle VOUT < VREG as Set by VS1-VS3. Percentage of l 85 89 95 % Period SW2 is Low in Boost Mode (Note 7) Minimum Duty Cycle VOUT > VREG as Set by VS1-VS3. Percentage of l 0 % Period SW1 is High in Buck Mode (Note 7) Switching Frequency PWM = VCC l 1.0 1.2 1.4 MHz SW1 and SW2 Minimum Low Time (Note 3) 90 ns MPPC Voltage l 1.12 1.175 1.22 V MPPC Input Current MPPC = 5V 1 10 nA RUN Threshold to Enable VCC l 0.5 0.9 1.15 V RUN Threshold to Enable Switching (Rising) VCC > 2.4V l 1.16 1.22 1.28 V RUN (Switching) Threshold Hysteresis 50 80 120 mV RUN Input Current RUN = 15V 1 10 nA VS1, VS2, VS3 Input High l 1.2 V VS1, VS2, VS3 Input Low l 0.4 V VS1, VS2, VS3 Input Current VS1, VS2, VS3 = VCC = 5V 1 10 nA PWM Input High l 1.6 V PWM Input Low l 0.5 V PWM Input Current PWM = 5V 0.1 1 µA Soft-Start Time 3 ms VCC Voltage VIN > 4.85V l 3.4 4.1 4.7 V VCC Dropout Voltage (VIN – VCC) VIN = 3.0V, Switching 35 60 mV VIN = 2.0V (VCC in UVLO) 0 2 mV 31291fc For more information www.linear.com/LTC3129-1 3