MAX5977A_1107 Datasheet, PDF (1/13 Pages) Maxim Integrated Products – 1V to 16V, Single-Channel, Hot-Swap Controllers 1V to 16V, Single-Channel, Hot-Swap Controllers

19-5553; Rev 2; 7/11
EVAALVUAAILTAIOBNLEKIT
1V to 16V, Single-Channel, Hot-Swap Controllers
with Precision Current-Sensing Output
General Description
The MAX5977A/MAX5977B hot-swap controllers provide
complete protection for systems with a 1V to 16V single-
supply voltage.
During the initial insertion, the hot-swap controllers
limit the inrush current from damaging the board or
from shorting out the backplane. When the input volt-
age is above the undervoltage threshold and below the
overvoltage threshold, a 5FA current source powered
from the internal 5V charge pump drives the gate of an
external n-channel MOSFET, providing a slow turn-on
response. An internal current-sense amplifier in the IC
monitors the current across an external shunt resistor,
providing current sensing for wide input-sense voltage
range. The devices provide two levels of overcurrent
circuit-breaker protections: a fast-trip threshold for a fast
turn-off and a lower slow-trip threshold for a delayed
turn-off.
Exceeding either of the overcurrent circuit-breaker
thresholds forces the device into fault mode where the
external n-channel MOSFET is disabled. The MAX5977
is available in two versions that provide a latched-off
(MAX5977A) or autoretry (MAX5977B) output when the
device is in fault mode.
A calibration mode allows further calibration of the inte-
grated transconductance amplifier for production testing
of the final design. The devices are offered in a 20-pin,
4mm x 4mm, TQFN-EP package and are fully specified
from -40NC to +85NC.
VariableSpeed/BiLevel is a trademark of Maxim Integrated
Products, Inc.
Features
S 1% Accurate Current-Sense Amplifier Output
S Hot-Swap Monitors Operation from 1V to 16V
S Integrated Charge Pump Fully Enhances the
External n-Channel FET (VGATE = VIN + 5V)
S VariableSpeed/BiLevelK Fault Protection Provides
Electronic Circuit-Breaker Function
S Output Latched Off After Fault Condition
(MAX5977A)
S Autoretry After Fault Condition (MAX5977B)
S Power-Good Indicator
S Calibration Mode
S Small, 20-Pin, 4mm x 4mm TQFN-EP Package
Applications
Servers
Storage Systems
Network Switches and Routers
General Hot-Swap
Ordering Information
PART
PIN-PACKAGE _{FAULT RESPONSE}
MAX5977AETP+ 20 TQFN-EP*
Latched
MAX5977BETP+ 20 TQFN-EP*
Autoretry
Note: All devices are specified over the -40NC to +85NC oper-
ating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
VIN
1V TO 16V
RSENSE
RCAL
RSCOMP RFCOMP
SCOMP FCOMP IN
CALSENSE
RGATE
SENSE GATE
SOURCE
CSOUT
CGATE
TO LOAD
CL
CURRENT-SENSE
AMPLIFIER OUTPUT
RCSOUT
CALIBRATION
MODE INPUT
CAL
2.7V TO 16V
MAX5977A
MAX5977B
+3.3V
PWR
AGND GND
FAULT
PG
FAULT OUTPUT
POWER-GOOD OUTPUT
________________________________________________________________ Maxim Integrated Products   1
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or visit Maxim’s website at www.maxim-ic.com.