MAX5978 Datasheet, PDF (1/38 Pages) Maxim Integrated Products – 0 to 16V, Hot-Swap Controller with 10-Bit Current, Voltage Monitor, and 4 LED Drivers

19-5328; Rev 0; 7/10
EVAALVUAAILTAIOBNLEKIT
0 to 16V, Hot-Swap Controller with 10-Bit
Current, Voltage Monitor, and 4 LED Drivers
General Description
The MAX5978 hot-swap controller provides complete pro-
tection for systems with a supply voltage from 0 to 16V.
The device includes four programmable LED outputs.
The IC provides two programmable levels of overcur-
rent circuit-breaker protection: a fast-trip threshold for
a fast turn-off, and a lower slow-trip threshold for a
delayed turn-off. The maximum overcurrent circuit-
breaker threshold range is set with a trilevel logic input
(IRNG), or by programming through the I²C interface.
The IC is an advanced hot-swap controller that monitors
voltage and current with an internal 10-bit ADC, which is
continuously multiplexed to convert the output voltage
and current at 10ksps. Each 10-bit sample is stored in an
internal circular buffer so that 50 past samples of each
signal can be read back through the I²C interface at any
time or after a fault condition.
The device includes five user-programmable digital
comparators to implement overcurrent warning and two
levels of overvoltage/undervoltage detection. When mea-
sured values violate the programmable limits, an external
ALERT output is asserted. In addition to the ALERT sig-
nal, the IC can be programmed to deassert the power-
good signal and/or turn off the external MOSFET.
The IC features four I/Os that can be independently
configured as general-purpose input/outputs (GPIOs) or
as open-drain LED drivers with programmable blinking.
These four I/Os can be configured for any mix of LED
driver or GPIO function.
The device is available in a 32-pin thin QFN-EP pack-
age and operates over the -40NC to +85NC extended
temperature range.
Ordering Information
PART
MAX5978ETJ+
TEMP RANGE
-40NC to +85NC
PIN-PACKAGE
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Features
S Hot-Swap Controller Operates from 0 to 16V
S 10-Bit ADC Monitors Load Voltage and Current
S Circular Buffers Store 5ms of Current and Voltage
Measurements
S Internal Charge Pump Generates n-Channel
MOSFET Gate Drive
S Internal 500mA Gate Pulldown Current for Fast
Shutdown
S VariableSpeed/Bilevel™ Circuit-Breaker
Protection
S Precision-Voltage Enable Input
S Alert Output Indicates Fault and Warning
Conditions
S Open-Drain Power-Good Output with
Programmable Polarity
S Open-Drain Fault Output
S Four Open-Drain General-Purpose Outputs Sink
25mA to Directly Drive LEDs
S Programmable LED Flashing Function
S Latched-Off Fault Management
S 400kHz I²C Interface
S Small, 5mm x 5mm, 32-Pin TQFN-EP Package
Applications
Blade Servers
DC Power Metering
Disk Drives/DASD/Storage Systems
Soft-Switch for ASICs, FPGAs, and
Microcontrollers
Network Switches/Routers
VariableSpeed/Bilevel is a trademark of Maxim Integrated
Products, Inc.
________________________________________________________________ Maxim Integrated Products   1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.