MAX26239/MAX26240

4.5V to 36V, 6A Buck-Boost Converters

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(VSUP = VEN = 14V, TJ = -40°C to +150°C, unless otherwise noted. Typical values are at TA = +25°C. Note 1 and Note 2.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Standby Supply Current

ISUP_STANDB

Y

VEN = VSUP, VOUT = 5V, no load, VSYNC

= 0V

95

μA

SUP Undervoltage

Lockout

VUVLO_RISE

VSUP rising

4.2

4.45

V

VUVLO_FALL

VSUP falling

1.9

VCC REGULATOR

VCC Output Voltage

VVCC

VSUP > 3.5V, IVCC = 1mA to 50mA

1.8

V

VCC Undervoltage

Lockout

VUVLO_VCC

VVCC falling

1.6

V

VUVLO_VCC_H

YS

VVCC hysteresis, Note 3

100

mV

VCC Short-Circuit

Current Limit

IVCC_SC

VCC shorted to AGND

50

mA

BUCK-BOOST CONVERTER

Fixed Output Voltage

VOUT_5V

VFB = VVCC

4.9

5.0

5.1

V

VOUT_11P5

VFB = VVCC

11.27

11.5

11.73

Soft-Start Ramp Time

tSOFT_START

2.5

ms

Auto Retry Time

tAUTO

Auto retry time after an output short

condition is detected

5

ms

Minimum ON Time

tON_MIN

In buck mode, fSW = 2.1MHz

100

ns

In buck mode, fSW = 400kHz, Note 3

125

Dead Time

tDEAD

Note 3

3

ns

LX1, LX2 Rise Time

tLX_RISE

Note 3

1.5

ns

LX1, LX2 Fall Time

tLX_FALL

Note 3

3

ns

POWER MOSFET

DMOS On-Resistance

RDSON_DMOS VVCC = 1.8V, IDSON = 0.2A

20

35

mΩ

LX1 Leakage Current

ILX1_LKG

VEN = 0V, VSUP = VLX1 = 36V,

TA = +25°C

5

μA

LX2 Leakage Current

ILX2_LKG

VEN = 0V, VLX2 = 12V, TA = +25°C

5

μA

CURRENT SENSE

Current Limit

ILIM

10A, Note 4

8

10

12

A

8.2A

6.8

8.2

9.5

ERROR AMPLIFIER

Regulated Feedback

Voltage

VFB

0.786

0.800

0.814

V

Feedback Leakage

Current

IFB_LKG

VFB = 0.8V, TA = +25°C

0.02

1

μA

Transconductance (from

FB to COMP)

gM

VFB = 0.8V, VVCC = 1.8V

85

100

115

μS

SWITCHING FREQUENCY

PWM Switching

Frequency

fSW

400kHz option

350

400

450

kHz

2.1MHz option

1.9

2.1

2.3

MHz

SYNC External Clock

Input

fSYNC

Minimum sync

pulse of 100ns

400kHz option

280

520

kHz

2.1MHz option

1.5

2.7

MHz

Spread Spectrum

SPS

±6

%

OUTPUT MONITORS