MAX15020 データシートの表示（PDF） - Maxim Integrated

部品番号

コンポーネント説明

メーカー

MAX15020

2A, 40V Step-Down DC-DC Converter with Dynamic Output-Voltage Programming

Maxim Integrated 

MAX15020

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

Dynamic Output-Voltage Programming

VIN

7.5V TO 40V

C1

560µF

R1

97.5kΩ

R2

4.02kΩ

PWM

INPUT

R3

10kW

0Ω

C3

0.1µF

D2

IN

ON/OFF

DVREG

BST

LX

R5

C10

10Ω

1µF

REG

MAX15020

C2

1µF

FB

C9

0.1µF

REFIN

COMP

SS REFOUT SYNC GND FSEL PGND EP

C8

0.22µF

C5

0.1µF

C4

1µF L1

22µH

D1

C13

330pF

R6

10kΩ

C11

0.027µF

C12

0.1µF

R9

15.8kΩ

VOUT

R7

10kΩ

C7

0.1µF

R8

340Ω

C6

560µF

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 RDS(ON) switch allows for up to 2A of output current.

The external compensation, voltage feedforward, and

automatically adjustable maximum ramp amplitude simpli-

fy the loop compensation design allowing for a variety of L

and C filter components. In shutdown, 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 program-

mable softstart, 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 externally

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 operation, 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 (VIN). The device is held off until

VIN 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 VON/OFF rises above the ON/OFF threshold

(1.225V), given that VIN 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.

www.maximintegrated.com

Maxim Integrated │  10

Share Link: