Electrical Characteristics

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Electrical Characteristics

(VSUP = VEN = 14V, TJ = -40°C to +150°C, unless otherwise noted. Typical values are at TA = +25°C under normal conditions unless otherwise noted. Note 2 and Note 3)

Supply Voltage Range VSUP 3 36 V
Supply Current ISUP_SHDN VEN = 0V, TA = +25°C 4 6 μA
ISUP VEN = high, VOUT = 3.3V, VFB = VBIAS, no load, no switching, TA = +25°C 10
SUP Undervoltage Lockout VSUP_UVLO_RISE SUP voltage rising 2.945 3.025 3.175 V
VSUP_UVLO_FALL SUP voltage falling 2.655 2.725 2.870
BIAS Undervoltage Lockout VBIAS_UVLO BIAS voltage falling 1.53 1.58 1.63 V
BIAS Undervoltage Lock VBIAS_UVLO_HYS BIAS UVLO hysteresis 50 mV
BIAS Voltage VBIAS 1.8 V
BUCK CONVERTER
Output Voltage Accuracy VOUT_5V Skip mode, no load 4.93 5.0 5.05 V
PWM mode, no load 4.95 5.0 5.05
VOUT_4.2V Skip mode, no load 4.13 4.2 4.245
PWM mode, no load 4.155 4.2 4.245
VOUT_3.9V Skip mode, no load 3.84 3.9 3.94
PWM mode, no load 3.86 3.9 3.94
VOUT_3.3V Skip mode, no load 3.245 3.3 3.335
PWM mode, no load 3.265 3.3 3.335
Output Voltage Adjustable Range VOUT 0.8 10 V
Feedback Voltage Accuracy VFB_PWM PWM mode, no load 0.787 0.800 0.813 V
Feedback Leakage Current IFB VFB = 0.8V, TA = +25°C 100 nA
High-Side DMOS On-Resistance RDSON_HS VBIAS = 1.8V, ILX = 2A 45 90 mΩ
Low-Side DMOS On-Resistance RDSON_LS VBIAS = 1.8V, ILX = 2A 22 44 mΩ
High-Side DMOS Current-Limit Threshold ILIM MAX20404 5.50 6.25 7.00 A
MAX20405 6.5 7.5 8.5
MAX20406/MAX20406E 7.5 8.75 10
Low-Side DMOS Negative Current-Limit Threshold INEG MAX20404 -2.3 A
MAX20405 -3
MAX20406/MAX20406E -3.5
LX Leakage ILX_LKG VSUP = 36V, VLX = 0V, or VLX = 36V,
TA = +25°C 		1 μA
Soft-Start Ramp Time tSS 2.2 2.8 ms
Minimum On-Time tON (Note 4) 33 55 ns
Maximum Duty Cycle DMAX Dropout Mode 98 99 %
SWITCHING FREQUENCY
PWM Switching Frequency fSW 400kHz 360 400 440 kHz
2.1MHz 1.925 2.1 2.275 MHz
2.3MHz 2.0 2.3 2.6
3.0MHz 2.7 3.0 3.3
SYNC External Clock Frequency fSYNC fSW = 400kHz 360 600 kHz
fSW = 2.1MHz 1.7 2.6 MHz
fSW = 2.3MHz 2.0 2.6
fSW = 3MHz 2.6 3.4
Spread Spectrum SPS Percentage of fSW ±3 %
PGOOD OUTPUT
PGOOD Threshold VPGOOD_THR VOUT rising 92 94 96 %
VPGOOD_THF VOUT falling 91 93 95
PGOOD Debounce Time tDEB Rising 100 μs
Falling 50
PGOOD Leakage Current IPGOOD_LKG TA = +25°C 1 μA
PGOOD Low Voltage Level VPGOOD_LOW Sinking 1mA 0.4 V
LOGIC LEVELS
EN High Voltage Level VEN_HIGH 1.2 V
EN Low Voltage Level VEN_LOW 0.5 V
EN Input Current IEN VEN = VSUP = 36V, TA = +25°C 1 μA
SYNC High Voltage Level VSYNC_HIGH 1.4 V
SYNC Low Voltage Level VSYNC_LOW 0.4 V
SYNCOUT Output Voltage Level VSYNCOUT No load 2.6 3.3 3.9 V
THERMAL PROTECTION
Thermal Shutdown TSHDN 175 °C
Thermal Shutdown Hysteresis TSHDN_HYS 20 °C
Note 2: Limits are 100% tested at TA = +25°C. Limits over the operating temperature range and relevant supply voltage are guaranteed by design and characterization. Typical values are at TA = +25°C.
Note 3: The device is designed for continuous operation up to TJ = +125°C for 95,000 hours and TJ = +150°C for 5,000 hours.
Note 4: Guaranteed by design; not production tested.

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