Datasheet MAX17577, MAX17578 (Maxim) - 4

link to page 4 link to page 4 link to page 4 link to page 15 link to page 13 MAX17577, MAX17578 4.5V to 60V, 1A High-Efficiency, Synchronous, Inverting Output DC-DC Converters
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 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
SYNC Pulse-Width tSYNC 100 ns VRT/ VIH At RT/SYNC Pin (Note 5) SYNC + 0.2 SYNC Threshold V VRT/ VIL At RT/SYNC Pin (Note 5) 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 3:
Electrical specifications are production tested at TA = +25ºC. Specifications over the entire operating temperature range are guaranteed by design and characterization.
Note 4:
See the Overcurrent Protection (OCP)/Hiccup Mode section for more details
Note 5:
VRT/SYNC = IRT_BIAS × RRT/SYNC. See the Switching Frequency and External Clock Synchronization (RT/SYNC) section for more details. www.maximintegrated.com Maxim Integrated | 4 Document Outline General Description Applications Benefits and Features Simplified Application Circuit Absolute Maximum Ratings Package Information TDFN Electrical Characteristics Electrical Characteristics (continued) Typical Operating Characteristics Typical Operating Characteristics (continued) Pin Configuration MAX17577, MAX17578 Pin Description Pin Description (continued) Functional Diagrams MAX17577/MAX17578 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 Inductive Output Short-Circuit Protection Power Dissipation PCB Layout Guidelines Typical Application Circuits -5V Typical Application Circuits Typical Application Circuits (continued) -12V Typical Application Circuit Ordering Information Revision History