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MAX15020

2A, 40V Step-Down DC-DC Converter with

Dynamic Output-Voltage Programming

10 ______________________________________________________________________________________

MAX15020

ON/OFF

1µF

22µH

OUT

DVREG

REG

REFIN

10Ω

97.5kΩ

4.02kΩ

560µF

10kΩ

340Ω

0.1µF

C11

0.027µF

560µF

10kΩ

0.1µF

1µF

C10

1µF

0.1µF

7.5V TO 40V

PWM

INPUT

0Ω

BST

10kΩ

C13

330pF

C12

0.1µF

15.8kΩ

COMP

0.22µF

REFOUT

0.1µF

SYNC GND FSEL

PGND

Figure 2. Typical Application Circuit

Detailed Description

The MAX15020 voltage-mode step-down converter

contains an internal 0.2Ω power MOSFET switch. The

MAX15020 input voltage range is 7.5V to 40V. The

internal low R

DS(ON)

switch allows for up to 2A of out-

put current. The external compensation, voltage feed-

forward, and automatically adjustable maximum ramp

amplitude simplify the loop compensation design allow-

ing for a variety of L and C filter components. In shut-

down, the supply current is typically 6µA. The output

voltage is dynamically adjustable from 0.5V to 36V.

Additional features include an externally programmable

UVLO through the ON/OFF pin, a programmable soft-

start, cycle-by-cycle current limit, hiccup-mode output

short-circuit protection, and thermal shutdown.

Internal Linear Regulator (REG)

REG is the output terminal of the 8V LDO powered from

IN and provides power to the IC. Connect REG exter-

nally to DVREG to provide power for the internal digital

circuitry. Place a 1µF ceramic bypass capacitor, C2,

next to the IC from REG to GND. During normal opera-

tion, REG is intended for powering up only the internal

circuitry and should not be used to supply power to the

external loads.

UVLO/ON/

OFF

Threshold

The MAX15020 provides a fixed 7V UVLO function

which monitors the input voltage (V

). The device is

held off until V

rises above the UVLO threshold.

ON/OFF provides additional turn-on/turn-off control.

Program the ON/OFF threshold by connecting a resis-

tive divider from IN to ON/OFF to GND. The device

turns on when V

ON/OFF

rises above the ON/OFF thresh-

old (1.225V), given that V

has risen above the UVLO

threshold.

Driving ON/OFF to ground places the IC in shutdown.

When in shutdown the internal power MOSFET turns

off, all internal circuitry shuts down, and the quiescent

supply current reduces to 6µA (typ.). Connect an RC

network from ON/OFF to GND to set a turn-on delay

that can be used to sequence the output voltages of

multiple devices.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 18 19

MAX15020 1

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