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PDF MAX15068 Data sheet ( Hoja de datos )

Número de pieza MAX15068
Descripción Single Hot-Swap Controller
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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MAX15068
EVALUATION KIT AVAILABLE
Dual ORing, Single Hot-Swap Controller with
Accurate Current Monitoring
General Description
The MAX15068 offers ORing function and hot-swap
features for two input-supply-rail applications requiring the
safe insertion and removal of circuit line cards from a live
backplane. The device integrates dual ORing MOSFET
controllers, a single hot-swap controller, electronic circuit-
breaker protection, and power monitoring in a single
package. The device is designed to operate from 3.7V to
18V supply voltages.
The device regulates the forward voltage drop across the
ORing MOSFETs to ensure smooth current transfer from
one supply to the other without oscillation. The ORing
MOSFET turns on quickly to reduce the load voltage droop
during supply switchover. If the input supply fails or is short-
ed, a fast turn-off minimizes reverse-current transients.
The device implements a foldback current limit during hot-
swap startup in order to control inrush current, thereby
lowering di/dt and keeping the operation of the hot-swap
MOSFET under safe operating area (SOA). An internal
70ms timer starts counting when the device enters the
hot-swap startup phase. After the hot-swap startup cycle
is completed, on-chip comparators provide active current-
limit protection against short-circuit and overcurrent faults.
The load is disconnected from the input quickly in the
event of a fault condition.
The device provides current monitoring from 3A to 10A
(VIN = 12V, TA = +25°C with RSENSE = 3mΩ) with ±0.6%
accuracy. A voltage proportional to the input current
delivered to the system could be read directly at the
IPMON pin.
The device is factory-calibrated to deliver accurate
overcurrent protection with ±5% accuracy. During an
overcurrent-fault condition, the device enters an autoretry
mode. The device features an adjustable slew-rate control
during startup. Additional features include power-good
and fault-indicator outputs.
The MAX15068 is available in a 20-pin, (4mm x 5mm)
TQFN package and is specified from a -40°C to +125°C
operating temperature range.
Features and Benefits
● 3.7V to 18V Operating Voltage Range (ORing and
Hot Swap)
● 4.8V to 18V Operating Voltage Range (Current
Monitor)
● Seamless Power Transition of Redundant Supplies
● Controls N-Channel MOSFETs
● < 0.5µs Turn-On and Reverse Turn-Off Time
Current Monitoring (±0.6% Accuracy Typ)
● Programmable Slew-Rate Control
Adjustable Current-Limit Fault Delay
● Programmable Circuit-Breaker Current Threshold
● Inrush Current Regulated at Startup with
Programmable SOA Control
● Programmable Undervoltage Lockout
● Small (4mm x 5mm) TQFN Package
Applications
● Baseband Station
● Redundant Power Supplies
● Supply Holdup
● Computer Systems and Servers
● Telecom Networks
● Storage Bridge Bay
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part, refer
to www.maximintegrated.com/MAX15068.related.
19-6872; Rev 0; 12/13
Free Datasheet http://www.datasheet4u.com/

1 page




MAX15068 pdf
MAX15068
Dual ORing, Single Hot-Swap Controller with
Accurate Current Monitoring
Electrical Characteristics (continued)
(VIN1 = VIN2 = 12V, CIN1 = CIN2 = CVS = 1µF, TA = -40°C to +125°C. Typical values are at TA = +25°C, unless otherwise noted.) (Note 2)
PARAMETER
CB Input Open-Current Voltage
CB Low Voltage
CB High Voltage
CURRENT MONITORING
Current Monitor vs. Undervoltage
Lockout
IMON Offset (Note 3)
IMON Gain (Note 3)
SYMBOL
VCB_OPEN
VIL
VIH
IMON_UVLO
IMON_OS
GIM
CONDITIONS
Force ±4µA into unconnected CB pin; then
measure voltage on the CB pin
VCB rising
VCB falling, relative to VS
MIN TYP MAX UNITS
1.0
VS - 1
V
0.4 V
VS - 0.2
V
VS rising
Hysteresis
VCSP = 12V
VCSP = 4.8V
to 18V
VCSP = 12V
VCSP = 4.8V
to 18V
TA = +25°C
TA = -40°C to +85°C
TA = -40°C to +125°C
TA = -40°C to +125°C
TA = +25°C
TA = -40°C to +125°C
TA = -40°C to +125°C
4.1 4.16 4.23
0.1
-80 +80
-200 +200
-240 -240
-300 +300
2.991
2.9595
3.009
3.0405
2.955
3.045
VCSP = 12V, RSENSE = 3mΩ, ILOAD = 1A,
(VCSP - VCSN) = 3mV, TA = +25°C,
IMON_ACCURACY = ((IIMON - 9µA)/9µA) x
100
-3
+3
V
µV
mS
Current Monitoring Total
Accuracy (Note 4)
IMON_
ACCURACY
VCSP = 12V, RSENSE = 3mΩ, ILOAD = 5A,
(VCSP - VCSN) = 15mV, TA = +25°C,
IMON_ACCURACY = ((IIMON - 45µA)/45µA)
x 100
-0.9
+0.9 %
VCSP = 12V, RSENSE = 3mΩ, ILOAD =
10A, (VCSP - VCSN) = 30mV, TA = +25°C,
IMON_ACCURACY = ((IIMON - 90µA)/90µA)
x 100
-0.6
+0.6
CMRR (Note 5)
Input Voltage Range
IMON_CMRR
(VCSP - VCSN)
MAX
VCSP = 4.8V to 18V
VCSP = 4.8V to 18V, -40°C ≤ TA ≤ +125°C
102
30
dB
mV
Output Voltage Range
VIMONMAX VCSP = 4.8V to 18V, -40°C ≤ TA ≤ +125°C
1.8
V
IMON Voltage Clamp
VIMON_CLMP
VCSP - VCSN ≥ 36mV, VCSP = 4.8V to 18V,
-40°C ≤ TA ≤ +125°C
2.25
2.4
2.5
V
Note 2: All devices are 100% production tested at TA = +25°C. Limits over temperature are guaranteed by design.
Note 3: Gain and offset are defined as IMON1 = IMON with Vi1 = (VCSP - VCSN) = 3mV, IMON2 = IMON with Vi2 = (VCSP - VCSN)
= 30mV, GIM = (IMON2 - IMON1)/(Vi2 - Vi1), IMON_OS = IMON1 - GIM x Vi1.
Note 4: Accuracy over the entire operating range can be determined combining the specified value of the related offset and gain in
the range.
Note 5: CMRR is calculated as:
IREF = IMON with VCSP - VCSN = 3mV at VREF = VCSP = 12V
ICM = IMON with VCSP - VCSN = 3mV at 4.8V < VCSP < 18V
CMRR = 20 x LOG(ABS((VREF - VCSP)/(IREF - ICM)) x GIM)
where GIM is the differential gain defined in the EC table.
www.maximintegrated.com
Maxim Integrated 5
Free Datasheet http://www.datasheet4u.com/

5 Page





MAX15068 arduino
MAX15068
Dual ORing, Single Hot-Swap Controller with
Accurate Current Monitoring
Functional Diagram
MAX15068
IN1 CSP CSN
IN2
VCB
MAX15068 - CURRENT MONITOR
1.3 x VCB
+
GATE
DRIVER
VS 10µA
CHARGE
CP1
CHARGE
PUMP 2
VS
PUMP 3
VS
CHARGE
PUMP 1
OG1 +
-
10mV
1.2V REFERENCE
VS
GENERATOR
VS
UV2
2.49V
UV1
2.65V
CIRCUIT BREAKER
1.2V
GATE ON
ON
FAULT RESET
LOGIC CONTROL
+0.6V
VS
100µA
1.2V
CDLY
2µA
+0.2V
LDO
REGULATOR
+
10mV
GATE
GATE_OK
0.9 x VCSP
OVERCURRENT
CARD PRESENT
VCB
+ 65mV
-
+ 50mV
-
VS
10µA 10µA 10µA
1.2V
+ 35mV
-
1.2V
GND
IPMON
GATE
OUT
CP2
OG2
PG
FAULT
EN
PC
CB
www.maximintegrated.com
Maxim Integrated 11
Free Datasheet http://www.datasheet4u.com/

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