MAX26402/MAX26403

36V, 2.5A/3.5A, Fully Integrated Synchronous

Silent Switcher Buck Converters

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Analog Devices | 4

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 1 and Note 2) )

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage Range

VSUP

3

36

V

t < 1s

42

Supply Current

ISUP_SHDN

VEN = 0V, TA = +25°C

2.75

5.00

μA

ISUP

VEN = high, VOUT = 3.3V, fixed output

voltage, no load, switching, TA = +25°C

10

SUP Undervoltage

Lockout

VSUP_UVLO_R

ISE

SUP voltage rising

2.900

3.025

3.150

V

VSUP_UVLO_F

ALL

SUP voltage falling

2.600

2.725

2.850

BIAS Voltage

VBIAS

1.8

V

BIAS Undervoltage

Lockout

VBIAS_UVLO

BIAS voltage rising

1.58

1.63

1.68

V

BIAS Undervoltage

Lockout Hysteresis

VBIAS_UVLO_

HYS

BIAS UVLO hysteresis (Note 3)

65

mV

BUCK CONVERTER

Output Voltage

Accuracy 5V

VOUT_SKIP_5V

TA = -40°C to

+125°C

VOUT = 5V, skip

mode, no load

4.92

5.00

5.07

V

VOUT_PWM_5

V

TA = -40°C to

+125°C

VOUT = 5V, PWM

mode, no load

4.94

5.00

5.06

Output Voltage

Accuracy 3.3V

VOUT_SKIP_3.

3V

TA = -40°C to

+125°C

VOUT = 3.3V, skip

mode, no load

3.24

3.30

3.36

V

VOUT_PWM_3.

3V

TA = -40°C to

+125°C

VOUT = 3.3V, PWM

mode, no load

3.254

3.300

3.346

Output Voltage

Adjustable Range

VOUT

0.8

12

V

Feedback Voltage

Accuracy

VFB_PWM

VFB = 0.8V, PWM mode, no load,

TA = -40°C to +125°C

7.88

0.800

0.812

V

Feedback Leakage

Current

IFB

VFB = 0.8V, TA = +25°C

100

nA

High-Side DMOS On-

Resistance

RDSON_HS

VBIAS = 1.8V, ILX = 0.5A

95

165

mΩ

Low-Side DMOS On-

Resistance

RDSON_LS

VBIAS = 1.8V, ILX = 0.5A

45

85

mΩ

High-Side DMOS

Current-Limit Threshold

ILIM

MAX26402

3.3

4.0

4.7

A

MAX26403

4.375

5.300

6.200

LX Leakage

ILX_LKG

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

TA = +25°C

1

μA

Soft-Start Ramp Time

tSS

2.5

ms

Minimum On-Time

tON

35

55

ns

Maximum Duty Cycle

DMAX

Dropout mode

98

99

%

SWITCHING FREQUENCY

PWM Switching

Frequency

fSW

fSW = 400kHz

360

400

440

kHz

fSW = 2.1MHz

1.925

2.100

2.275

MHz

fSW = 3.0MHz

2.7

3.0

3.3

fSYNC

fSW = 400kHz

300

600

kHz