MAX20743
Integrated, Step-Down Switching
Regulator with PMBus
General Description
Benefits and Features
● High-Power Density and Low Component Count
The MAX20743 is a fully integrated, highly efficient
switching regulator with PMBus™ for applications
operating from 4.5V to 16V and requiring up to 35A
maximum load. This single-chip regulator provides
extremely compact, high-efficiency power delivery
solutions with high-precision output voltages and excellent
transient response for networking, datacom and telecom
equipment.
2
• Overall Solution Size 509mm Including Inductor
and Output Capacitors
• 90.8% Peak Efficiency with V
= 12V and
DDH
V
= 1V
OUT
• Fast Transient Response: Supports Up to 300A/μs
Load-Step Transients
● Optimized Component Performance and Efficiency
with Reduced Design-In Time
The IC offers a broad range of programmable features
through either the PMBus or through a capacitor and
resistor connected to a dedicated programming pin.
Using this feature, the operation can be optimized for a
specific application, reducing the component count and/
or setting appropriate trade-offs between the regulator’s
performance and system cost. Ease of programming
enables using the same design for multiple applications.
• PMBus-Compliant Interface for Telemetry and
Power Management
• Voltage, Current and Temperature Reporting
through Digital Bus
● Increased Power-Supply Reliability with System and
IC Self-Protection Features
• Differential Remote Sense with Open-Circuit
Detection
• Hiccup Overcurrent Protection
• Programmable Thermal Shutdown
The IC includes protection and telemetry features. Positive
and negative cycle-by-cycle overcurrent protection and
overtemperature protection ensure a rugged design. Input
undervoltage lockout shuts down the device to prevent
operation when the input voltage is out of specification.
A status pin provides an output signal to show that the
output voltage is within range and the system is regulating.
Typical System Efficiency vs.
Load Current (V
= 12V)
DDH
100
95
90
85
80
75
70
65
60
55
50
Applications
● Communication Equipment
● Networking Equipment
● Servers and Storage Equipment
● Point-of-Load Voltage Regulators
● μP Chipset
● Memory V
VoVuOt =U5TV= 5V
= 3.3V
= 1.8V
VoVuOt =U1T.8V
Vout = 1.2V
VOUT = 1.2V
Vout = 1V
VOUT = 1V
DDQ
V
Vout = 3.3V
OUT
● I/O
CURRENT
RATING* VOLTAGE
INPUT
OUTPUT
VOLTAGE
Vout = 0.8V
VOUT = 0.8V
Vout = 0.65V
VOUT = 0.65V
DESCRIPTION
Electrical Rating
Thermal Rating
35A
34A
4.5V to 16V 0.6V to 5.5V
0
5
10
15
20
25
30
35
IOUT (A)
12V
12V
1V
1V
T
= 55°C, 200LFM
A
Ordering Information appears at end of data sheet.
Thermal Rating
= 85°C, 0LFM
22A
T
A
*For specific operating conditions, refer to the SOA curves in
PMBus is a trademark of SMIF, Inc.
the Typical Operating Characteristics section.
19-8582; Rev 1; 10/16