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Rainbow Electronics MAX15038 User Manual

Page 2

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MAX15038

4A, 2MHz Step-Down Regulator
with Integrated Switches

2

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

IN

= V

EN

= 5V, C

VDD

= 2.2µF, T

A

= T

J

= -40°C to +85°C, typical values are at T

A

= +25°C, circuit of Figure 1, unless otherwise

noted.) (Note 3)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

IN, PWRGD to GND..................................................-0.3V to +6V
V

DD

to GND ..................-0.3V to the lower of +4V or (V

IN

+ 0.3V)

COMP, FB, MODE, REFIN, CTL1, CTL2, SS,

FREQ to GND ..........................................-0.3V to (V

DD

+ 0.3V)

OUT, EN to GND ......................................................-0.3V to +6V
BST to LX..................................................................-0.3V to +6V
BST to GND ............................................................-0.3V to +12V
PGND to GND .......................................................-0.3V to +0.3V
LX to PGND ..................-0.3V to the lower of +6V or (V

IN

+ 0.3V)

LX to PGND ..........-1V to the lower of +6V or (V

IN

+ 1V) for 50ns

I

LX(RMS)

(Note 1) ......................................................................4A

V

DD

Output Short-Circuit Duration .............................Continuous

Converter Output Short-Circuit Duration ....................Continuous
Continuous Power Dissipation (T

A

= +70°C)

24-Pin TQFN (derate 27.8mW/°C above +70°C) ........2222mW

Thermal Resistance (Note 2)

θ

JA

.................................................................................36°C/W

θ

JC

..................................................................................6°C/W

Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C

Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed

the IC’s package power dissipation limits.

Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

layer board. For detailed information on package thermal considerations, refer to

www.maxim-ic.com/thermal-tutorial

.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

IN

IN Voltage Range

2.9

5.5

V

V

IN

= 3.3V

4.7

8

IN Supply Current

f

S

= 1MHz, no load

V

IN

= 5V

5

8.5

mA

V

IN

= 5V, V

EN

= 0

10

20

Total Shutdown Current from IN

V

IN

= V

DD

= 3.3V, V

EN

= 0

45

µA

3.3V LDO (V

DD

)

V

DD

rising

2.6

2.8

V

DD

falling

2.35

2.55

V

V

DD

Undervoltage Lockout

Threshold

LX starts/stops switching

Minimum glitch-width
rejection

10

µs

V

DD

Output Voltage

V

IN

= 5V, I

VDD

= 0 to 10mA

3.1

3.3

3.5

V

V

DD

Dropout

V

IN

= 2.9V, I

VDD

= 10mA

0.08

V

V

DD

Current Limit

V

IN

= 5V, V

DD

= 0

25

40

mA

BST

BST Supply Current

V

BST

= V

IN

= 5V, V

LX

= 0 or 5V, V

EN

= 0

0.025

µA

PWM COMPARATOR

PWM Comparator Propagation
Delay

10mV overdrive

20

ns

PWM Peak-to-Peak Ramp
Amplitude

1

V

PWM Valley Amplitude

0.8

V