MAX20021 Datasheet, PDF (1/16 Pages) Maxim Integrated Products – Step-Down DC-DC Converters

MAX20021/MAX20022
EVALUATION KIT AVAILABLE
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
Ordering Information/Selector Guide appear at end of data
sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX20021.related.
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-PWM Operation
• Two Channels 180º Out-of-Phase
• SYNC Input
• Spread-Spectrum Option
● 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
Simplified Block Diagram
VOUT1
10kΩ
PG_
5V
VA
1µF
GND
MAX20021
CONTROL
SS OSC
4 CHANNELS
EN_
SEL
SYNC
5V
PV_
2.2µF
STEP-DOWN
PWM OUT_
1.0V TO 4.0V
UP TO
0.5A OR 1A
LX_ ^1.5µH
PGND_
VOUT_
10µF
EN
OUTS_
EP
19-6628; Rev 2; 12/13