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Automotive Quad/Triple Low-Voltage Step-
Down DC-DC Converters
MAX20029/MAX20029B/
MAX20029C/MAX20029D
General Description
Benefits and Features
The MAX20029/MAX20029B/MAX20029C/MAX20029D
power-management ICs (PMICs) integrate four low-volt-
age, high-efficiency, step-down DC-DC converters. Each
of the four outputs is factory or resistor programmable
between 1V to 4.0V (MAX20029/MAX20029B) or 0.7V
to 3.8V (MAX20029C/MAX20029D). The MAX20029/
MAX20029C has two 0.5A/1A/1.5A channels and two
0.5A/1.5A channels, while the MAX20029B/MAX20029D
has two 0.5A/1.5A channels and by combining channels 1
and 2, a single 2A/3A channel. The PMICs operate from
3.0V to 5.5V, making them ideal for automotive point-of-
load and post-regulation applications.
● Quad Step-Down DC-DC Converters with Integrated
FETs
● Operate from 3.0V to 5.5V Supply Voltage
● 0.7V to 4.0V Fixed or Adjustable Output Voltage
● 2.2MHz Switching Frequency
● MAX20029/MAX20029C: Up to Four 1.5A Channels
● MAX20029B/MAX20029D: Up to One 3A + Two 1.5A
Channels
● Designed to Improve Automotive EMI Performance
• Forced-PWM Operation
• Two Channels 180° Out-of-Phase
• SYNC Input
• Spread-Spectrum Option
The PMICs feature fixed-frequency PWM-mode operation
with a switching frequency of 2.2MHz. High-frequency op-
eration 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.
● Soft-Start and Supply Sequencing Reduces Inrush
Current
● Individual Enable Inputs and Power-Good Outputs
Simplify Sequencing
● OV Input-Voltage Monitoring
● Overtemperature and Short-Circuit Protection
● 28-Pin (5mm x 5mm x 0.8mm) TQFN-EP Package
● -40°C to +125°C Operating Temperature Range
The PMICs offer a spread-spectrum option to reduce radi-
ated emissions. Two of the four buck converters operate
180° out-of-phase with the internal clock. This feature re-
duces 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 in-
put to synchronize to an external clock.
The PMICs provide individual enable inputs and power-
good/ reset outputs, as well as factory-programmable PG
times.
The PMICs offer several important protection features in-
cluding: input overvoltage protection, input undervoltage
lockout, cycle-by-cycle current limiting, and overtempera-
ture shutdown.
The MAX20029/MAX20029B/MAX20029C/MAX20029D
PMICs are available in a 28-pin TQFN package with an
exposed pad and are specified for operation over the
-40°C to +125°C automotive temperature range.
Applications
● Automotive
● Industrial
19-100083; Rev 12; 4/22
Ordering Information appears at end of data sheet.
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