Datasheet MAX17579, MAX17580 (Analog Devices) - 4

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Electrical Characteristics (continued)
(VIN = VEN/UVLO = 24V, CVCC = 2.2μF, VFB = 1V, RT/SYNC = LX = SS = RESET = Open, VBST to VLX = 5V, VGND = VSOUT = VOUT = 0V, TA = -40°C to +125°C. Typical values are at TA = +25°C. All voltages are referenced to SOUT, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS SWITCHING FREQUENCY AND EXTERNAL CLOCK SYNCHRONIZATION (RT/SYNC)
RRT/SYNC = Open 525 600 675 R Switching Frequency f RT/SYNC = 6.81kΩ 365 400 425 SW kHz RRT/SYNC = 10.5kΩ 565 600 635 RRT/SYNC = 43.2kΩ 1980 2200 2420 Minimum On-Time tON_MIN 60 80 ns Minimum Off-Time tOFF_MIN 140 150 160 ns LX Dead Time tLX-DT 5 ns VFB Hiccup Threshold VFB-HICF VFB Falling 0.55 0.58 0.61 V Hiccup Timeout (Note 3) 32768 cycles Bias Current IRT_BIAS 60 μA SYNC Frequency- 1.1 x 1.4 x f kHz Capture Range SW set by RRT/SYNC fSW fSW SYNC Pulse Width tSYNC 100 ns VRT/ VIH SYNC + 0.2 SYNC Threshold At RT/SYNC Pin (Note 4) V VRT/ VIL SYNC - 0.2 SYNC Duty-Cycle D Range SYNC 10 90 %
SYSTEM GROUND (GND)
GND Current IGND Sourcing 10 μA
RESET (REFERRED TO GND)
RESET Output Level V Low RESETL IRESET = 10mA (Referred to GND) 0.4 V RESET Output-Leakage I Current RESETLKG TA = TJ = +25°C, VRESET = 5.5V -0.1 +0.1 μA FB Threshold for V RESET Deassertion FB-OKR VFB Rising 93.8 95 97.8 % FB Threshold for V RESET Assertion FB-OKF VFB Falling 90.5 92 94.6 % RESET Delay after FB 1024 Cycles reaches 95% regulation
THERMAL SHUTDOWN
Thermal Shutdown T Rising Threshold SHDNR 165 °C Thermal Shutdown T Hysteresis SHDNHY 10 °C
Note 2:
Electrical specifications are production tested at TA = +25ºC. Specifications over the entire operating temperature range are guaranteed by design and characterization.
Note 3:
See the Overcurrent Protection (OCP)/Hiccup Mode section for more details www.analog.com Analog Devices | 4 Document Outline General Description Applications Benefits and Features Simplified Application Circuit Absolute Maximum Ratings Package Information TDFN-EP Electrical Characteristics Electrical Characteristics (continued) Typical Operating Characteristics Typical Operating Characteristics (continued) Pin Configuration MAX17579, MAX17580 Pin Description Functional Diagrams MAX17579/MAX17580 Block Diagram Detailed Description Switching Frequency and External Clock Synchronization Linear Regulator (VCC) Operating Input-Voltage Range Overcurrent Protection (OCP)/Hiccup Mode RESET Output Prebiased Output Thermal-Shutdown Protection Applications Information Inductor Selection Load Current Capability (IOUT(MAX)) Input Capacitor Selection Output Capacitor Selection Soft-Start Capacitor Selection Adjusting Output Voltage Setting the Input Undervoltage-Lockout Level Soft-Start Inductive Output Short-Circuit Protection Power Dissipation PCB Layout Guidelines Typical Application Circuits -5V Typical Application Circuits Typical Application Circuits (continued) -15V Typical Application Circuit Ordering Information Revision History