Datasheet MAX1951, MAX1952 (Analog Devices) - 3

1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators MAX1951/MAX1952 ELECTRICAL CHARACTERISTICS (continued)
(VIN = VCC = 3.3V, PGND = GND, FB in regulation, CREF = 0.1µF,
TA = 0°C to +85°C
, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER CONDITIONS MIN TYP MAX UNITS LX
VIN = 5V 116 LX On-Resistance, PMOS VIN = 3.3V 140 266 mΩ VIN = 2.6V 163 VIN = 5V 93 LX On-Resistance, NMOS VIN = 3.3V 106 206 mΩ VIN = 2.6V 116 LX Current-Sense From LX to COMP, VIN = 2.6V to 5.5V 0.16 0.24 0.35 Ω Transimpedance High side 2.4 3.1 4.5 LX Current-Limit Threshold Duty cycle = 100%, VIN = 2.6V to 5.5V A Low side -0.6 VLX = 5.5V 10 LX Leakage Current VIN = 5.5V µA LX = GND -10 LX Switching Frequency VIN = 2.6V to 5.5V 0.85 1 1.1 MHz LX Maximum Duty Cycle VCOMP = 1.5V, LX = Hi-Z, VIN = 2.6V to 5.5V 100 % LX Minimum Duty Cycle VCOMP = 1V, VIN = 2.6V to 5.5V 15 %
THERMAL CHARACTERISTICS
TJ rising 160 Thermal-Shutdown Threshold When LX starts/stops switching °C TJ falling 145
ELECTRICAL CHARACTERISTICS
(VIN = VCC = 3.3V, PGND = GND, FB in regulation, CREF = 0.1µF,
TA = -40°C to +85°C
, unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS IN AND VCC
IN Voltage Range 2.6 5.5 V Supply Current Switching with no load, VIN = 5.5V 10 mA Shutdown Current COMP = GND 1 mA V VCC rising 2.5 CC Undervoltage Lockout When LX starts/stops switching V Threshold VCC falling 1.95
REF
REF Voltage IREF = 0µA, VIN = 2.6V to 5.5V 1.95 2.03 V REF Load Regulation IREF = 0 to 40µA, VIN = 2.6V to 5.5V 0.2 % REF Line Regulation IREF = 20µA, VIN = 2.6V to 5.5V 0.4 % REF Shutdown Resistance From REF to GND, COMP = GND 22 Ω
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