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MAX16543
Integrated Protection IC on a High-Power 12V Bus with
an Integrated MOSFET and Lossless Current Sensing
General Description
Benefits and Features
● Used with the MAX16545B/MAX16545C to Provide
The MAX16543 is an integrated follower protection
IC that is used in parallel with a Maxim MAX16545B/
MAX16545C master integrated protection IC for distri-
bution, control, monitoring and protection of a system’s
12V bus. The MAX16543 increases the current capabil-
ity of the MAX16545B/MAX16545C. The MAX16545B/
MAX16545C provide the reporting and fault protection cir-
cuits for the combined chipset. Up to two MAX16543s can
be added to a MAX16545B/MAX16545C IC to provide DC
current capability of more than 60A. The 1.8V bias sup-
ply and gate drive voltage supply of the MAX16543 are
powered by the MAX16545B/MAX16545C.
Integrated Protection for Loads > 60A On 12V Bus
● High Density: Industry’s Smallest Circuit Breaker
Solution Provides More Than 75% Board Area
Savings
• 12-Lead QFN Package
• Integrated Power MOSFET with 1.5mΩ Total
Resistance in 12V Power Path (R
Package), Not Including Any Parallel Devices
, Including
DS(ON)
● Lossless, Precise Total System Current Sensing and
Reporting
● PMBus/SMBus Control and Reporting Through the
All features of the MAX16545B/MAX16545C remain avail-
able when a MAX16543 is added to the circuit. The chip-
set provides monotonic startup with programmable ramp
and delay to limit inrush current during startup. The total
current is monitored and reported. Programmable system
overcurrent protection is provided with several levels of
protection.
MAX16545B/MAX16545C
● Increases Power-Supply Reliability with IC Self-
Protection Features
• Very Fast Fault Detection and Isolation
• V to V
Short Protection During Startup
IN
OUT
• Overtemperature Protection
● Three Levels of Overcurrent Protection (OCP)
The MAX16543 includes Maxim’s patented lossless
current sense to provide high accuracy current sensing
through the MAX16545B/MAX16545C IC. The MAX16543
reports its current to the MAX16545B/MAX16545C, which
then reports the total current.
• Programmable Moderate OCP
• Programmable Severe OCP Provides Isolation
< 5μs
• Fail-Safe Safe OCP Provides Isolation < 250ns
● Modular Design, MAX16545B/MAX16545C with
Single or Dual MAX16543 in Parallel Provide
Different DC Current Capabilities
The MAX16543 is controlled entirely by the MAX16545B/
MAX16545C IC. The chipset input and output voltage fault
protection is provided by the MAX16545B/MAX16545C,
which enables and disables the MAX16543 as command-
ed by circuit conditions and command signals. Master
+ 1 Follower Chipset and Master + 2 Follower Chipsets
show the basic application circuits for the master/fol-
lower chipset, with single and dual MAX16543s working
in tandem to provide higher current ratings than a single
MAX16545B/MAX16545C.
• MAX16545B/MAX16545C + 1 MAX16543:
90A DC Capability
• MAX16545B/MAX16545C + 2 MAX16543:
120A DC Capability
Systems and Applications
Servers, Networking, Storage, Communication Equipment
and AC/DC Power Supplies
● Integrated Protection IC on 12V: Circuit Breaker/
E-Fuse, Hot Swap
Ordering Information appears at end of data sheet.
19-8742; Rev 3; 3/19
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