Datasheet MAX1951 (Analog Devices) - 4

1MHz, All-Ceramic, 2.6V to 5.5V Input, 2A PWM Step-Down DC-to-DC Regulators ELECTRICAL CHARACTERISTICS (continued)
(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 COMP
MAX1951 40 80 COMP Transconductance From FB to COMP, VCOMP = 1.25V µS MAX1952 26.7 53.3 COMP Clamp Voltage, Low VIN = 2.6V to 5.5V, VFB = 1.3V 0.6 1.2 V COMP Clamp Voltage, High VIN = 2.6V to 5.5V, VFB = 1.1V 1.97 2.28 V COMP Shutdown Resistance From COMP to GND, VIN = 2V 30 Ω COMP rising 1.2 COMP Shutdown Threshold When LX starts/stops switching V COMP falling 0.17 COMP Startup Current COMP = GND 14 40 µA
FB
Output Voltage Range When using external feedback resistors to drive FB 0.8 V
MAX1951/MAX1952
IN V (MAX1951) FB Regulation Voltage MAX1951 0.783 0.807 VCOMP = 1V to 2V, VIN = 2.6V to 5.5V V (Error Amp Only) MAX1952 1.764 1.836 FB Input Resistance From FB to GND MAX1952 10 30 kΩ FB Input Bias Current MAX1951 -0.1 +0.1 µA
LX (Note 4)
LX On-Resistance, PMOS 266 mΩ LX On-Resistance, NMOS 206 mΩ LX Current Sense From LX to COMP, VIN = 2.6V to 5.5V 0.16 0.35 Ω LX Current-Limit Threshold Duty cycle = 100%, VIN = 2.6V to 5.5V, high side 2.4 4.5 A VLX = 5.5V 10 LX Leakage Current VIN = 5.5V µA LX = GND -10 LX Switching Frequency VIN = 2.6V to 5.5V 0.8 1.1 MHz LX Maximum Duty Cycle VCOMP = 1.5V, LX = Hi-Z, VIN = 2.6V to 5.5V 100 %
Note 3:
Specifications to -40°C are guaranteed by design and not production tested.
Note 4:
The LX output is designed to provide 2.4A RMS current.
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