MAX8688 Просмотр технического описания (PDF) - Maxim Integrated
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MAX8688 Datasheet PDF : 38 Pages
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Digital Power-Supply Controller/Monitor
with PMBus Interface
3.3V
0.1µF
A1/SCLE
A2/SDAE
A3/ONOFF
SCL
SDA
RST
FLT
CLKIO
DVDD
DGND
MAX8688
POWER MONITOR
AVDD
AGND
ADC
SMBus
CONTROLLER
TEMP SENSOR
INTERNAL REFERENCE
PMBus COMMAND AND
STATUS REGISTERS
DAC
MAXQ® µC
200Ω
200Ω
S1
0.1µF
RS-
RS+
RS_C
ISN-
ISN+
ISN_C
REFO
1µF
DACOUT
ENOUT
Figure 1. MAX8688 Functional Diagram
Detailed Description
For many applications, it is desirable to control the out-
put voltage of a POL power supply to a much higher
accuracy than the offered standard 1% overtempera-
ture specification. Many designs are required to
access information such as output voltage, output cur-
rent, and temperature of individual power supplies in a
board, for monitoring system health as well as logging
fault information to help in failure analysis. Moreover, it
is desirable to sequence startup and shutdown of multi-
ple power supplies in an application with programma-
ble start, stop delays, and soft-start ramp rates to avoid
latchup and stressing of ESD structures. The MAX8688
solves these problems by providing the required func-
tions in a small compact IC that is capable of interfac-
ing with a master controller through an on-board
PMBus interface. Up to 127 MAX8688s can reside on
the same PMBus bus, each controlling its own POL,
under command from the system controller, as shown
in Figure 2. Long traces from POLs located at various
system board locations for voltage sensing and current
sensing are avoided resulting in a cleaner layout for the
system designer. POLs can therefore be placed close
to the load where they provide the best transient
response with short power plane runs.
MAXQ is a registered trademark of Maxim Integrated Products, Inc.
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