MAX20021/MAX20022

Automotive Quad, Low-Voltage

Step-Down DC-DC Converters

General Description

The MAX20021/MAX20022 power-management ICs

(PMICs) integrate four low-voltage, high-efficiency, step-

down DC-DC converters. Each of the four outputs is

factory or resistor programmable between 1.0V to 4.0V

and can deliver up to 1.0A of current. The PMICs operate

from 3.0V to 5.5V, making them ideal for automotive point-

of-load and post-regulation applications.

The PMICs feature fixed-frequency PWM-mode operation

with a switching frequency of 2.2MHz or 3.2MHz. High-

frequency operation allows for an all-ceramic capacitor

design and small-size external components. The low-

resistance on-chip switches ensure high efficiency at

heavy loads while minimizing critical inductances, making

the layout a much simpler task with respect to discrete

solutions. Internal current sensing and loop compensation

reduce board space and system cost.

The PMICs offer a spread-spectrum option to reduce

radiated emissions. Two of the four buck converters oper-

ate 180º out-of-phase with the internal clock. This feature

reduces the necessary input capacitance and improves

EMI as well. All four buck converters operate in constant-

PWM mode outside the AM band. The PMICs offer a

SYNC input to synchronize to an external clock.

The PMICs provide individual enable inputs and power-

good/reset outputs, as well as factory-programmable

RESET times.

The PMICs offer several important protection features

including: input overvoltage protection, input undervoltage

monitoring, input undervoltage lockout, cycle-by-cycle

current limiting, and overtemperature shutdown. The

input undervoltage monitor indicates a brownout condition

by driving PG_ low when the input falls below the UVM

threshold.

The MAX20021/MAX20022 PMICs are available in a

28-pin TQFN package with an exposed pad and are

specified for operation over the -40ºC to +125ºC automo-

tive temperature range.

Applications

● Automotive

● Industrial

Benefits and Features

● Quad Step-Down DC-DC Converters with Integrated

FETs

● Operate from 3.0V to 5.5V Supply Voltage

● 1.0V to 4.0V Fixed or Adjustable Output Voltage

● 2.2MHz (MAX20022) or 3.2MHz (MAX20021)

Switching Frequency

● Four Channels Capable of Delivering Up to 1A Each

● Designed to Improve Automotive EMI Performance

• Forced-PWMOperation

• TwoChannels180ºOut-of-Phase

• SYNCInput

• Spread-SpectrumOption

● Soft-Start and Supply Sequencing Reduces Inrush

Current

● Individual Enable Inputs and Power-Good Outputs to

Simplify Sequencing

● OV/UV Input-Voltage Monitoring

● Overtemperature and Short-Circuit Protection

● 28-Pin (5mm x 5mm x 0.8mm) TQFN-EP Package

● -40ºC to +125ºC Operating Temperature Range

19-6628; Rev 2; 12/13

sheet.

For related parts and recommended products to use with this part, refer

to

www.maximintegrated.com/MAX20021.related.

Simplified Block Diagram

EVALUATION KIT AVAILABLE

PGND_

LX_

SYNC

OUTS_

EP

CONTROL

10µF

1.5µH

5V

MAX20021

2.2µF

1µF

EN_

PG_

GND

SEL

STEP-DOWN

PWM OUT_

1.0V TO 4.0V

UP TO

0.5A OR 1A

SS OSC

4 CHANNELS

PV_

EN

5V

10kΩ