Datasheet MAX1836, MAX1837 (Maxim) - 3

MAX1836/MAX1837 24V Internal Switch, 100% Duty Cycle, Step-Down Converters
Electrical Characteristics (continued)
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), VIN = 12V, SHDN = IN,
TA = 0°C to +85°C
. Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Zero-Crossing Timeout LX does not rise above the threshold 30 µs LX Switch Leakage Current VIN = 18V, LX = GND, TA = +25°C 1 µA Dropout Voltage VDROPOUT IOUT = 100mA, VIN = 5V 120 mV Line Regulation VIN = 5V to 24V 0.05 % Load Regulation IOUT = 0 to 125mA (MAX1836) or 250mA (MAX1837) 0.3 % Shutdown Input Threshold VSHDN VIN = 4.5V to 24V (Note 3) 0.8 2.4 V Shutdown Leakage Current ISHDN VSHDN = 0 or 24V -1 +1 µA Thermal Shutdown 10°C hysteresis (typ) 160 °C
Electrical Characteristics
(Circuits of Figures 1 (MAX1836) and 2 (MAX1837), VIN = 12V, SHDN = IN,
TA = -40°C to +85°C
, unless otherwise noted.) (Note 4)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Input Supply Range VIN 4.5 24 V Input Undervoltage Lockout VIN rising 3.55 4.4 Threshold VUVLO V VIN falling 3.45 4.3 Input Supply Current IIN 25 µA Input Shutdown Current SHDN = GND 7 µA FB = GND, MAX183_EUT50, MAX183_ETT50 4.80 5.20 Output Voltage (Preset Mode) V ILOAD = 0 to 125mA OUT (MAX1836) or V MAX183_EUT33, 250mA (MAX1837) MAX183_ETT33 3.168 3.432 Output Voltage Range (Adjustable Mode) VOUT (Note 2) 1.25 VIN V Feedback Set Voltage (Adjustable Mode) VFB 1.200 1.300 V OUT Bias Current VOUT = 5V 7.4 µA FB Dual Mode Threshold VFB rising or falling 50 150 mV LX Switch Minimum Off-Time tOFF(MIN) 0.2 0.6 µs LX Switch Maximum On-Time tON(MAX) VFB = 1.3V 7 13 µs LX Switch On-Resistance RLX VIN = 6V 2
Ω
MAX1836 250 450 LX Current Limit ILIM mA MAX1837 500 900 www.maximintegrated.com Maxim Integrated │ 3