MAX5976A Hot-Swap Solution Datasheet

MAX5976A Datasheet, PDF, Equivalent


Part Number

MAX5976A

Description

Hot-Swap Solution

Manufacture

Maxim Integrated

Total Page 9 Pages
Datasheet
Download MAX5976A Datasheet


MAX5976A
19-5542; Rev 1; 4/11
EVAALVUAAILTAIOBNLEKIT
2.7V to 18V, 7A, Hot-Swap Solution
General Description
The MAX5976A/MAX5976B are integrated solutions for
hot-swap applications requiring the safe insertion and
removal of circuit line cards from a live backplane. The
devices integrate a hot-swap controller, 24mI power
MOSFET, and electronic circuit-breaker protection in a
single package. The ICs are designed for protection of
2.7V to 18V supply voltages.
The devices provide inrush current control and short-
circuit detection during startup. During normal operation,
the devices provide circuit-breaker protection against
overload and short-circuit conditions. The circuit-breaker
function disconnects the power to the load if the load
current exceeds the circuit-breaker limit. The devices
are factory-calibrated to deliver accurate overcurrent
protection with Q10% accuracy. During a fault condi-
tion, the MAX5976A enters an autoretry mode while the
MAX5976B latches off. Both versions feature a resistor-
adjustable variable speed circuit-breaker threshold and
overtemperature protection. Additional features include
power-good and fault indicator outputs.
The ICs are available in a 16-pin, 5mm x 5mm, TQFN-
EP package and fully specified over the -40°C to +85°C
operating temperature range.
RAID Systems
Storage Bridge Bay
Disk Drive Power
Server I/O Cards
Industrial
Applications
Features
S 2.7V to 18V Operating Voltage Range
S 24mI Internal Power MOSFET
S 7A Load Current Capability
S No Sense Resistor Required
S ±10% Circuit-Breaker Threshold Accuracy
S Adjustable Circuit-Breaker Current
S Variable Speed Circuit-Breaker Response
S Thermal Protection
S Power-Good and Fault Outputs
S Latch-Off or Automatic Retry Options
S Drive-Present Signal Input
S Active-Low and Active-High Enables
Ordering Information
PART
PIN PACKAGE
FAULT
MANAGEMENT
MAX5976AETE+ 16 TQFN-EP*
Autoretry
MAX5976BETE+ 16 TQFN-EP*
Latched Off
Note: All devices are specified over the -40°C to +85°C
operating temperature range.
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit
2.7V TO 18V
CIN
IN
TVS
R1
ON1
R2
RCB
CB
MAX5976A
MAX5976B
OUT
PRESDET
ON2
CREG
REG
PG
FAULT
GND
VIN
VPRESDET
REMOVABLE CARD
LOAD
(7A)
RON2
RPG
RFAULT
µP
2.7V TO 6V
________________________________________________________________ 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.

MAX5976A
2.7V to 18V, 7A, Hot-Swap Solution
ABSOLUTE MAXIMUM RATINGS
IN to GND..............................................................-0.3V to +20V
CB to GND...............................................-0.3V to (VREG + 0.3V)
ON1, REG to GND...................................................-0.3V to +6V
OUT, ON2, PRESDET
to GND............... -0.3V to the lower of (VIN + 0.3V) and +20V
PG, FAULT to GND................................................-0.3V to +26V
Continuous Power Dissipation (TA = +70NC)
TQFN (derate 33.3mW/NC above +70NC) (Note 1)...2666.7mW
Operating Ambient Temperature Range............ -40NC to +85NC
Maximum Junction Temperature.....................................+150NC
Storage Temperature Range............................ -60NC to +150NC
Lead Temperature (soldering, 10s).................................+300NC
Soldering Temperature (reflow).......................................+260NC
Note 1: As per JEDEC51 standard (multilayer board).
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 2)
TQFN
Junction-to-Case Thermal Resistance (BJC)....................30NC/W
Junction-to-Ambient Thermal Resistance (BJA)............... ...2NC/W
Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-
layer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.
ELECTRICAL CHARACTERISTICS
(VIN = 12V, VON1 = 2V, VON2 = VPRESDET = 0V, RCB = 40kI, TA = TJ = -40NC to +85NC, unless otherwise noted. Typical values are
at TA = +25NC.) (Note 3)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Supply Voltage Range
VIN
2.7 18 V
Input Supply Current
IIN
VON1 = 3V, no load, 7A current-limit
threshold
5 7.5 mA
Default Undervoltage Lockout
VUVLO
VIN rising, VON1 = VIN
2.35 2.5 2.65
V
Default Undervoltage Lockout
Hysteresis
VUVLO_HYS
0.1 V
ON1 Turn-On Threshold
VON1_TH VON1 rising
1.17 1.21 1.25
V
ON1 Turn-On Threshold
Hysteresis
VON1_HYS VON1 falling
0.1 V
ON1 Input Bias Current
CURRENT LIMIT
ION1
VON1 = 0 to 5V
-1 +1 FA
Circuit-Breaker Accuracy
(At Startup)
Slow-Comparator Response
Time (Note 4)
MOSFET
ICB,TH
tSCD
RCB = 40kI
RCB = 28.57kI
RCB = 20kI
RCB = 10kI
0.6% overcurrent
30% overcurrent
6.3
4.5
3.15
1.575
7
5
3.5
1.75
2.7
200
7.7
5.5
3.85
1.925
A
ms
Fs
Total On-Resistance
LOGIC INPUTS (ON2, PRESDET)
RON
15 24 41 mI
Low Voltage Input
High Voltage Input
Input Current
VIL 2.7V < VIN < 18V
VIH 2.7V < VIN < 18V
IIN VON2, VPRESDET = 0 to 6V
0.4 V
1.4 V
-1 +1 FA
2


Features 19-5542; Rev 1; 4/11 EVAALVUAAILTAIOBNLE KIT 2.7V to 18V, 7A, Hot-Swap Solution MAX5976A/MAX5976B General Descriptio n The MAX5976A/MAX5976B are integrated solutions for hot-swap applications req uiring the safe insertion and removal o f circuit line cards from a live backpl ane. The devices integrate a hot-swap c ontroller, 24mI power MOSFET, and elect ronic circuit-breaker protection in a s ingle package. The ICs are designed for protection of 2.7V to 18V supply volta ges. The devices provide inrush current control and shortcircuit detection dur ing startup. During normal operation, t he devices provide circuit-breaker prot ection against overload and short-circu it conditions. The circuit-breaker func tion disconnects the power to the load if the load current exceeds the circuit -breaker limit. The devices are factory -calibrated to deliver accurate overcur rent protection with Q10% accuracy. Dur ing a fault condition, the MAX5976A ent ers an autoretry mode while the MAX5976B latches off. Both vers.
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