MAX5977A_1107 MAXIM [Maxim Integrated Products], MAX5977A_1107 Datasheet

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MAX5977A_1107

Manufacturer Part Number
MAX5977A_1107
Description
1V to 16V, Single-Channel, Hot-Swap Controllers 1V to 16V, Single-Channel, Hot-Swap Controllers
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
1.MAX5977A_1107.pdf (13 pages)
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.
19-5553; Rev 2; 7/11
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.
1V to 16V, Single-Channel, Hot-Swap Controllers
_______________________________________________________________ Maxim Integrated Products 1
General Description
with Precision Current-Sensing Output
1V TO 16V
CALIBRATION
MODE INPUT
V
IN
2.7V TO 16V
R
CAL
CALSENSE
CAL
PWR
SCOMP
R
SCOMP
FCOMP
R
FCOMP
MAX5977A
MAX5977B
IN
AGND
R
SENSE
GND
SENSE
S 1% Accurate Current-Sense Amplifier Output
S Hot-Swap Monitors Operation from 1V to 16V
S Integrated Charge Pump Fully Enhances the
S VariableSpeed/BiLevelK Fault Protection Provides
S Output Latched Off After Fault Condition
S Autoretry After Fault Condition (MAX5977B)
S Power-Good Indicator
S Calibration Mode
S Small, 20-Pin, 4mm x 4mm TQFN-EP Package
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.
MAX5977AETP+
MAX5977BETP+
External n-Channel FET (V
Electronic Circuit-Breaker Function
(MAX5977A)
GATE
SOURCE
CSOUT
FAULT
Servers
Storage Systems
Network Switches and Routers
General Hot-Swap
PART
R
GATE
PG
+3.3V
R
C
CSOUT
GATE
CURRENT-SENSE
AMPLIFIER OUTPUT
Typical Operating Circuit
FAULT OUTPUT
POWER-GOOD OUTPUT
PIN-PACKAGE
C
L
20 TQFN-EP*
20 TQFN-EP*
TO LOAD
Ordering Information
GATE
Applications
FAULT RESPONSE
= V
IN
Features
Autoretry
Latched
+ 5V)

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MAX5977A_1107 Summary of contents

Page 1

Rev 2; 7/ 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 16V single- supply voltage. During the initial insertion, the hot-swap controllers ...

Page 2

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output ABSOLUTE MAXIMUM RATINGS PWR, SENSE, IN, FCOMP, SCOMP, GATE, SOURCE, CALSENSE to GND ...............-0.3V to +28V PG, CAL, BIAS, UV, OV, FAULT, CSOUT to GND ..-0.3V to +6V REG to ...

Page 3

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output ELECTRICAL CHARACTERISTICS (continued 12V 4mI, R PWR IN SENSE FCOMP Typical Values 3.3V, T PWR IN PARAMETER SYMBOL CURRENT-SENSE ...

Page 4

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output ELECTRICAL CHARACTERISTICS (continued 12V 4mI, R PWR IN SENSE FCOMP Typical Values 3.3V, T PWR IN PARAMETER SYMBOL CHARGE ...

Page 5

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output ( 3.3V +25NC, R PWR IN A FCOMP I vs. TEMPERATURE _COMP FCOMP SCOMP 15 ...

Page 6

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output ( 3.3V +25NC, R PWR IN A FCOMP FAST-COMPARATOR RESPONSE TIME (10mV OVERDRIVE) MAX5977 toc10 t FSD V FCOMP SENSE 2µs/div ...

Page 7

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output TOP VIEW *CONNECT TO AGND. PIN NAME 1 REG Regulator Output. Bypass REG with a 1FF capacitor. 2 PWR Power-Supply Input. Bypass PWR with a 0.1FF or higher value capacitor. ...

Page 8

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output IN SENSE 0 MUX CALSENSE 1 S CAL SCOMP 25µA FCOMP 50µA UV 0.59V OV 0.59V UVLO PWR LDO REG BIAS 8 CS AMPLIFIER MAX5977A OVERDRIVE MAX5977B DELAY OD DELAY/ ...

Page 9

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output Detailed Description The hot-swap controllers provide electronic circuit- breaker protection and precision current sensing for a single-supply voltage from 1V to 16V. Programmable undervoltage and overvoltage protection qualifies the supply ...

Page 10

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output Power-Good Output The open-drain, active-high output PG indicates the power-good status of the output. Once the input voltage satisfies the undervoltage and overvoltage requirements for startup and ...

Page 11

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output An output resistor must be connected between CSOUT the transconductance current-sense amplifier output CSOUT and AGND. The transconductance G amplifier is typically 2500FS: R × G × V ...

Page 12

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output 16V 49.9I 0.1µF IN 125µA OUTF PRECISION CURRENT OUTS SOURCE GND 5.1kI 1µF MAX6033AAUT25 *OPTIONAL Chip Information PROCESS: BiCMOS 12 R SENSE R R SCOMP FCOMP ...

Page 13

Single-Channel, Hot-Swap Controllers with Precision Current-Sensing Output REVISION REVISION NUMBER DATE 0 9/10 Initial release 1 1/11 Changed current-sense amplifier specifications in Electrical Characteristics table 2 7/11 Updated Electrical Characteristics specifications to reflect improved yield of part ...

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