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Description
The
PI2121 is a complete full-function
Active ORing solution with a high-speed ORing
MOSFET controller and a very low on-state
resistance MOSFET designed for use in redundant
power system architectures. The PI2121
Cool-ORing
solution is offered in an extremely small, thermally
enhanced 5mm x 7mm LGA package and can be
used in low voltage (≤ 5Vbus) high side Active ORing
applications. The PI2121 enables extremely low
power loss with fast dynamic response to fault
conditions, critical for high availability systems. A
master/slave feature allows the paralleling of PI2121
solutions
for
high
current
Active
ORing
requirements.
The PI2121, with its 1.5mΩ internal MOSFET
provides very high efficiency and low power loss
during steady state operation, while achieving high-
speed turn-off of the internal MOSFET during input
power source fault conditions that cause reverse
current flow. The PI2121 provides an active low
fault flag output to the system during excessive
forward current, light load, reverse current, over-
voltage, under-voltage and over-temperature fault
conditions. A temperature sensing function indicates
a fault if the maximum junction temperature exceeds
160°C. The under-voltage and over-voltage
thresholds are programmable via an external resistor
divider.
Typical Application:
PI2121
Series
Features
•
•
•
•
•
•
•
•
•
Integrated High Performance 24A, 1.5mΩ
MOSFET
Very-small, high density fully-optimized solution
providing simple PCB layout.
Fast Dynamic Response to Power Source
failures, with 160ns reverse current turn-off
delay time
Accurate sensing capability to indicate system
fault conditions
Programmable under & over-voltage functions
Over temperature fault detection
Adjustable reverse current blanking timer
Master/Slave I/O for paralleling
Active low fault flag output
8 Volt, 24 Amp Full-Function Active ORing Solution
Applications
•
•
•
•
•
N+1 Redundant Power Systems
Servers & High End Computing
Telecom Systems
High-side Active ORing
High current Active ORing (≤ 5Vbus)
Package Information
•
17-pin 5mm x 7mm Thermally Enhanced LGA
Package
Figure 1:
PI2121 High Side Active ORing
Picor Corporation • picorpower.com
Figure 2:
PI2121 input current de-rating based on maximum
T
J
=150°C vs. ambient temperature
PI2121
Rev. 1.2
Page
1 of 21
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Pin Description
Pin
Name
D
S
SP
Pin
Number
1, 15,
16, 17
2, 3, 4, 5
6
7
8
Description
Drain-
The Drain of the internal N-channel MOSFET, connect to the output load.
Source-The
source of the internal N-channel MOSFET, connect to the input power source bus
voltage.
Positive Sense Input & Clamp:
Connect SP pin to the S pin. The polarity of the voltage
difference between SP and SN provides an indication of current flow direction through the
MOSFET.
Fault State Output:
This open collector pin pulls low when a fault occurs. Fault logic inputs
are VC Under-Voltage, Input Under-Voltage, Input Over-Voltage, Forward Over-Current, light
load, reverse current, and Over-Temperature. Leave this pin open if unused.
Blanking timer Input-Output:
Connect a resistor from BK to GND to set the blanking time for
the Reverse Comparator function. To configure in slave mode, connect BK to VC. To
configure in master mode with the fastest turn-off response connect BK directly to GND.
Slave Input-Output:
This pin is used for paralleling multiple PI2121 solutions in high power
applications. When the PI2121 is configured as the Master, this pin functions as an output
capable of driving up to 10
SL
pins of slaved PI2121 devices. It serves as an input when the
PI2121 is configured in slave mode.
Input Supply Pin:
This pin is the supply pin for the control circuitry and gate driver. Connect
a 1μF capacitor between VC pin and the GND pin. Voltage on this pin is limited to 15.5V by
an internal shunt regulator in high auxiliary voltage applications. For high voltage auxiliary
supply applications connect a shunt resistor between VC and the auxiliary supply.
Ground:
This pin is ground for the gate driver and control circuitry.
Input Over Voltage Input:
The OV pin is used to detect an input source over-voltage
condition in ground referenced applications. When the OV pin voltage crosses the OV
threshold, the
FT
pin pulls low indicating a fault condition. The input voltage OV threshold is
programmable through an external resistor divider. Connect OV to GND to disable this
function.
Input Under-Voltage Input:
The UV pin is used to detect an input source under-voltage
condition in ground referenced applications. When the UV pin voltage drops below the UV
threshold, the
FT
pin pulls low indicating a fault condition. The input voltage UV threshold is
programmable through an external resistor divider. Connect UV to VC to disable this function.
Negative Sense Input & Clamp-
Connect SN to D pin. The polarity of the voltage difference
between SP and SN provides an indication of current flow direction through the MOSFET.
FT
BK
SL
9
VC
GND
10
11
OV
12
UV
13
SN
14
Package Pin-out
17 Pin LGA (5mm x 7mm)
Top view
Picor Corporation • picorpower.com
PI2121
Rev. 1.2
Page
2 of 21
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Absolute Maximum Ratings
Drain-to-Source Voltage (V
DS
)
Source Current (I
S
) Continuous
Source Current (I
S
) Pulsed (10μs)
Thermal Resistance R
θJA
(3)
Thermal Resistance R
θJ-PCB
(3)
VC
SP, SN, OV,
SL
UV,BK,
FT
GND
Storage Temperature
Operating Junction Temperature
Lead Temperature (Soldering, 20 sec)
ESD Rating
8V @ 25°C
24A
100A
54°C/W
14°C/W
-0.3V to 17.3V / 40mA
-0.3V to 8.0V / 10mA
-0.3V to 17.3V / 10mA
-0.3V / 5A peak
-65
o
C to 150
o
C
-40
o
C to Over Temperature Fault (T
FT
)
260
o
C
1kV HBM
Electrical Specifications
Unless otherwise specified: -40°C < T
J
< 125°C, VC =12V, C
Vc
= 1uF, C
SL =
10pF
Parameter
VC Supply
Operating Supply Range
(4)
Quiescent Current
VC Clamp Voltage
VC Clamp Shunt Resistance
VC Under-voltage Rising Threshold
VC Under-voltage Falling Threshold
VC Under-voltage Hysteresis
Internal N-Channel MOSFET
Drain-to-Source Breakdown Voltage
Source Current Continuous
Drain Leakage Current
Drain-to-Source On Resistance
Body Diode Forward Voltage
FAULT
Under-Voltage Rising Threshold
Under-Voltage Falling Threshold
Under-Voltage Threshold Hysteresis
Under-Voltage Bias Current
Over-Voltage Rising Threshold
Over-Voltage Falling Threshold
Picor Corporation • picorpower.com
Symbol
V
VC-GND
I
VC
V
VC-CLM
R
VC
V
VCUVR
V
VCUVF
V
VCUV-HS
Min
4.5
Typ
Max
13.2
Units
V
mA
V
Ω
V
V
mV
Conditions
No VC limiting resistors
Normal Operating Condition, No
Faults
I
VC
=10mA
Delta I
VC
=10mA
3.7
15
15.5
4.3
4.0
4.15
150
4.2
16
7.5
4.5
BV
DSS
I
S
I
DLK
R
DSon
V
f-BD
V
UVR
V
UVF
V
UV-HS
I
UV
V
OVR
V
OVF
8
24
10
1.5
0.7
500
440
-1
500
440
475
PI2121
V
A
μA
mΩ
V
mV
mV
mV
1
540
μA
mV
mV
In OFF state, I
D
=250µA ,
Tj=25°C;
Figure 10, page 11
In ON state, Tj=25°C
In OFF state, V
DS
=8V, Tj=25°C
In ON state, I
S
=20A, Tj=25°C
VC-V(S)
≥
5V
In ON state, I
S
=4A, Tj=25°C
2.0
1.0
540
475
25
Rev. 1.2
Page
3 of 21
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Electrical Specifications
Unless otherwise specified: -40°C < T
J
< 125°C, VC =12V, C
Vc
= 1uF, C
SL =
10pF
Parameter
Symbol Min
Typ
Max
Units
FAULT
(Continued)
Over-Voltage Threshold Hysteresis
Over-Voltage Bias Current
Fault Output Low Voltage
Fault Output High Leakage Current
Fault Delay Time
Over Temperature Fault
(1)
Over Temperature Fault Hysteresis
(1)
Common Mode Input Voltage
Differential Operating Input Voltage
SP Input Bias Current
SN Input Bias Current
SN Voltage
Reverse Comparator Threshold
Reverse Comparator Hysteresis
Reverse to Slave Low Delay Time
Reverse to Slave Low Delay Time
Forward Comparator Threshold
Forward Comparator Hysteresis
Forward Over Current Comparator
Threshold
Forward Over Current Comparator
Hysteresis
SLAVE
Slave Source Current
Slave Output Voltage High
Slave Output Voltage Low
Slave Hold-off Voltage at VC UVLO
Slave Threshold
Slave Fall Time
Slave Low to FET Turn Off Delay
(1)
Time
Master Mode
Slave Low to FET Turn Off Delay
(1)
Time
Slave Mode
V
OV-HS
I
OV
V
FTL
I
FT-LC
t
FT-DEL
T
FT
T
FT-HS
V
CM
V
SP-SN
I
SP
I
SN
V
SN
V
RVS-TH
V
RVS-HS
t
RVS-MS
t
RVS-SL
V
FWD-TH
V
FWD-HS
V
OC-TH
V
OC-HS
2
-5
60
-8
66
-10
2
160
530
6
-6
-0.1
-50
-50
-37
3.5
8
5.5
-2
5
200
700
9
-2
70
-4
20
40
160
-10
5.5
125
-1
0.2
25
1
0.5
10
60
mV
μA
V
μA
μs
°C
°C
V
mV
μA
μA
V
mV
mV
ns
ns
mV
mV
mV
mV
Conditions
I
FT
=2mA, VC>3.5V
V
FT
=14V
Includes output glitch filter
DIFFERENTIAL AMPLIFIER AND COMPARATORS
SP to GND & SN to GND
SP-SN
SP=SN=1.25V
SP=SN=1.25V
SP=0V
V
CM
= 3.3V @ 25°C
V
CM
= 3.3V @ 25°C
V
SP-SN
= -50mV step, V
BK
=0
(minimum blanking)
V
SP-SN
= -50mV step, V
BK
= V
VC
(maximum blanking)
V
CM
= 3.3V @ 25°C
V
CM
= 3.3V @ 25°C
V
CM
= 3.3V @ 25°C
V
CM
= 3.3V @ 25°C
V
SL
= 1V, Normal Operating
Conditions, No Faults
Normal Operating Conditions,
No Faults
I
SL
=4mA
I
SL
=5μA,1.5V<VC<3.5V
VBK=0
VBK=0
VBK=VC
I
SL
V
SL-Hi
V
SL-Lo
V
SL-UV
V
SL-TH
t
SL-FL
t
G-SL
t
G-SL
-60
4.3
0.2
0.7
1.75
15
20
100
-25
5.5
0.5
1
2
25
30
130
μA
V
V
V
V
ns
ns
ns
Picor Corporation • picorpower.com
PI2121
Rev. 1.2
Page
4 of 21
END OF LIFE
Electrical Specifications
Unless otherwise specified: -40°C < T
J
< 125°C, VC =12V, C
Vc
= 1uF, C
SL =
10pF
Parameter
Symbol Min
Typ
Max
Units
BLANK
Blank Source Current
Blank Output Voltage
Blank Slave Mode Threshold
I
BK
V
BK
V
BK-TH
1.2
-60
-45
0.77
1.45
-30
0.9
1.7
μA
V
V
V
BK
=0V
Conditions
I
BK
=5μA Connected to GND
Note 1:
These parameters are not production tested but are guaranteed by design, characterization and
correlation with statistical process control.
Note 2:
Current sourced by a pin is reported with a negative sign.
Note 3:
Thermal resistance characterized on PI2121-EVAL1 evaluation board with 0 LFM airflow.
Note 4:
Refer to the
Auxiliary Power Supply
section in the
Application Information
for details on the VC
requirement to fully enhance the internal MOSFET.
Picor Corporation • picorpower.com
PI2121
Rev. 1.2
Page
5 of 21
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