MAX42408/MAX42410

36V, 8A/10A Fully Integrated Buck Converter

with 10μA Quiescent Current and Dual-Phase

Capability

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Analog Devices | 4

Electrical Characteristics

(VSUP = VEN = 14V, TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C under normal conditions, unless

otherwise noted (Note 1, Note 2).)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range

VSUP

4.5

36

V

Supply Current

ISUP_SHDN

VEN = 0, TA = +25°C

4

6

μA

ISUP

VEN = 1, VOUT = 3.3V, no load, switching

10

SUP Undervoltage

Lockout

Rising

2.9

3.0

3.2

V

Falling

2.6

2.7

2.9

BIAS Voltage

+2.5V ≤ VSUP ≤ +36V

1.8

V

BIAS Undervoltage

Lockout

VBIAS_UVLO

Rising

1.58

1.63

1.68

V

VBIAS_UVLO_

HYS

Hysteresis

50

mV

BUCK CONVERTER

Adjustable Output-

Voltage Range

fsw = 1.5MHz

0.8

6

V

fsw = 400kHz

0.8

10

FB Voltage Accuracy

VFB_PWM

PWM mode, no load

0.788

0.800

0.812

V

FB Leakage Current

IFB

VFB = 0.8V, TA = +25°C

100

nA

High-Side Switch On

Resistance

RDSON_HS

VBIAS = 1.8V, ILX = 5A

26

53

mΩ

Low-Side Switch On

Resistance

RDSON_LS

VBIAS = 1.8V, ILX = 5A

13

26

mΩ

High-Side Switch

Current-Limit Threshold

ILIM

MAX42408

10

12

14

A

MAX42410

11.9

14

16

Low-Side Switch

Negative Current-Limit

Threshold

INEG

-4

A

LX Leakage Current

ILX_LKG

VSUP = 36V, VLX = 0V or VLX = 36V, TA

= +25°C

-5

5

μA

Soft-Start Ramp Time

tSS

fsw = 1.5MHz

3.5

ms

fsw = 400kHz

2.5

Minimum On-Time

TON

Note 3

34

65

ns

Maximum Duty Cycle

Dropout mode

98

99

%

SWITCHING FREQUENCY

PWM Switching

Frequency

fSW

fSW = 1.5MHz

1.375

1.500

1.625

MHz

fSW = 400kHz

360

400

440

kHz

SYNC External Clock

Frequency

fSYNC

fSW = 1.5MHz

1.215

1.845

MHz

fSW = 400kHz

360

600

kHz

PGOOD OUTPUT

PGOOD Threshold

VPGOOD_R

Percentage of VOUT, rising

92

94

96

%

VGOOD_F

Percentage of VOUT, falling

91

93

95

PGOOD Debounce

TDEB

PWM mode, falling

fSW = 1.5MHz

70

μs

fSW = 400kHz

50

PWM mode, rising

fSW = 1.5MHz

140

μs

fSW = 400kHz

100