Data Sheet No.PD60211 rev.D
IR3312(S)
PROGRAMMABLE CURRENT SENSING HIGH SIDE SWITCH
Features
•
•
•
•
•
•
•
Load current feedback
Programmable over current shutdown
Active clamp
E.S.D protection
Input referenced to Vcc
Over temperatue shutdown
Reverse battery protection
Product Summary
R
ds(on)
V
cc.op.
Current ratio
I
shutdown
Active clamp
Load Dump
Package
20m
Ω
6 to 28V
2800
3 to 30A
35V
40V
Description
The IR 3312(S) is a Fully Protected 4 terminal high side switch.
The input signal is referenced to Vcc. When the input voltage
Vcc - Vin is higher than the specified Vih threshold, the output
power MOSFET is turned-on. When Vcc - Vin is lower than
the specified Vil threshold, the output MOSFET is turned-off.
A sense current proportional to the current in the power Mosfet
is sourced to the Ifb pin. Over-current shutdown occurs when
Vifb - Vin > 4.5 V. The current shutdown threshold is adjusted
by selecting the proper RIfb. Either over-current and over-tem-
perature latches off the switch. The device is reset by pulling
the input pin high. Other integrated protections ( ESD, reverse
battery, active clamp ) make the IR3312(S) very rugged and
suitable for the automotive environment.
5 Lead TO220
IR3312
D
2
Pak
5 Lead
(SMD220)
IR3312S
Typical Connection
VCC
IN
Ifb
10 k
IR 3312
OUT
LOAD
Battery
RIfb
on
off
System
Ground
Power
Ground
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IR3312(S)
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters
are referenced to Vcc lead. (TAmbient = 25
o
C unless otherwise specified).
Symbol
Vcc - Vin max
Vcc-VIfb max
Vcc - Vout max.
Ids cont.
Ids1 cont
Ids pulsed
ESD 1
ESD 2
Pd
TJ max.
Min RIfb
Ifb max
Parameter
Maximum input voltage
Maximum Ifb voltage
Maximum output voltage
Diode max. permanent current (Rth = 60 °C/W) (1)
Diode max. permanent current (Rth = 5 °C/W) (1)
Diode max. pulsed current (1)
Electrostatic discharge ( human body model )C=100pF, R=1500Ω,
Electrostatic discharge (machine model)C=200pF,R=0Ω, L=10µH
Power dissipation ( Rth = 60 °C/W )
Max. storage and junction temperature
Minimum resistor on the Ifb pin
Max. Ifb current
Min.
-16
-0.3
-0.3
—
—
—
—
—
—
-40
0.3
-20
Max.
50
50
33
2.8
25
100
4
0.5
2
150
—
+20
Units
V
A
kV
W
°C
kΩ
mA
Thermal Characteristics
Symbol
R th
R th
R th
R th
1
2
1
2
Parameter
Thermal resistance junction to Ambient - TO220
Thermal resistance junction to case - TO220
Thermal resistance with standard footprint - SMD220
Thermal resistance with 1" square footprint - SMD220
Thermal resistance junction to case - SMD220
Typ.
60
0.7
60
35
0.7
Max.
—
—
—
—
—
Units
°C/W
R th 3
Recommended Operating Conditions
These values are given for a quick design. For operation outside these conditions, please consult the application notes.
Symbol
Vcc -Vin
Vcc -VIfb
Vcc
Iout
Iout 85°C amb.
RIfb
Pulse min.
Fmax
Fmax Prot.
Parameter
Continuous input voltage
Continuous Ifb pin voltage
Supply to power ground voltage
Continuous output
current ( Rth/amb < 5 °C/W, Tj = 125°C)
Continuous output
current ( Rth/amb < 60 °C/W, Tj = 125°C)
Ifb resistor to program Isd and scale (2 & 3)
Minimum turn-on pulse width
Maximum operating frequency
Maximum frequency with protections activated
Min.
6
0.3
6
—
—
0.5
1
—
—
Max.
28
28
28
14
3.9
3.5
—
500
200
Units
V
A
kΩ
ms
Hz
1) Limited by junction temperature. Pulsed current is also limited by wiring
2) <500 Ohm or shorting Ifb to gnd may damage the part with Isd around 37A
3) >5000 Ohm or leaving Ifb open will shutdown the part. No current will flow in the load.
2
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IR3312(S)
Protection Characteristics
Symbol
VIfb -Vin
@ Isd
Tsd
Treset
OV
Isdf
Isd_1k
Min.Pulse
WAIT
Tj = 25
o
C (unless otherwise specified), RIfb = 500 to 5kOhm.
Parameter
Over-current shutdown threshold
Over-temp. shutdown threshold
Protection reset time
Over voltage shutdown (not latched)
Fixed over current shutdown
Adjustable over current shutdown 1K
Minimum pulse width (no WAIT state)
WAIT function timer
Min.
4
—
—
33
30
9
200
0.5
10
Typ.
4.5
165
50
36
37
12
500
1.2
16
Max. Units Test Conditions
5.4
—
300
41
45
16
1200
3.5
28
V
°C
µS
V
A
A
µs
ms
mΩ
see Fig. 7
see Fig. 7
VIfb<Vin
RIfb=1k
see Fig. 6
see Figs. 6 and 7
Vcc-Vin=-12V, Iload=5A
Rev.Rdson Rds(on) reverse battery protection
Static Electrical Characteristics
(Tj = 25
o
C, Vcc = 14V unless otherwise specified.)
Symbol
Iq
Iin
Vih
Vil
Vhys
Iout qs
Rds1 on
Rds2 on
Rds3 on
Vclamp1
Vclamp2
Vsd
Vaval.
Parameter
Total quiescent current (Iout +Ifb)
Input current
High level input threshold voltage (4)
Low level input threshold voltage (4)
Input hysterisis = Vih-Vil
Output quiescent current
ON state resistance (5)
ON state resistance (5)
ON state resistance (5)
Vcc to Vout active clamp voltage
Vcc to Vout active clamp voltage
Body diode forward voltage
Vcc to Vout avalanche voltage
Min.
—
1.5
—
3.5
0.4
—
10
10
20
33
—
—
40
Typ.
22
4
5
4
1
9
15
16
28.5
35
36
0.85
43
Max. Units Test Conditions
50
6
5.5
—
1.5
15
20
28
38
—
40
1
50
µ
A
mA
V
µA
Vcc-Vin=0; Vcc-VIfb=0;
Vcc-Vout=12V
Iout=15A, Vcc-Vin=14V
Iout=10A, Vcc -Vin=6V
Iout=15A, Tj = 150
o
C
Iout = 10mA
Iout=30A,Vcc-VIfb<20V
Iout=5A
Iout=100mA,Vcc-Vfb> 35V
Vcc-Vin=0, Vcc- Vout=12V
Vcc-VIfb=12V
Vcc-Vin=14V
mΩ
V
Switching Electrical Characteristics
Vcc = 14V, Resistive Load = 0.4Ω, T
j
= 25
o
C, (unless otherwise specified).
Symbol Parameter
Tdon
Tr1
Tr2
E on
Td off
Tf
Eoff
Turn-on delay time to Vcc-Vout= 0.9 Vcc
Rise time to Vcc-Vout=5V
Rise time to Vcc -Vout = 0.1Vcc
Turn ON energy
Turn-off delay to Vcc -Vout = 0.1Vcc
Fall time to Vcc-Vout = 0.9 Vcc
Turn OFF energy
Min.
2
0.2
5
—
5
2
—
Typ. Max. Units Test Conditions
9
1
15
0.75
14
7
0.5
20
5
60
1.5
60
25
1
µs
see figure 2
mJ
µs
mJ
see figure 3
4) Input thresholds are measured directly between the input pin and the tab. Any parasitic resistance in common between the load
current path and the input signal path can significantly affect the thresholds.
5) Rds(on) is measured between the Tab and the Out pin, 5mm away from the package.
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IR3312(S)
Current Sense Characteristics
Symbol Parameter
Ratio
I load / IIfb current ratio
Min.
2,400
-5
-0.45
—
Typ.
2,800
0
0
5
Max. Units Test Conditions
3,300
+5
0.45
15
—
%
A
µs
T
j
= 25
o
C ,Rfb = 500Ω,
I = 30A
T
j
= -40 T
0
+150
o
C
I = 2A
90% of the I load step
Ratio_TC Iload/Ifb variation over temperature
offset
Load current diagnostic offset
Trst
Ifb response time (low signal)
Functional Block Diagram
VCC
charge
pump
4mA
70V
active clamp
disconnection
driver
On/Off
fast turn-off
70V
33V
+
-
33V
Reset
36V
33V
Q
latch
Set
Wait
timer
1.5 ms
4V
-
+
80Ω
I out > 30 A
Tj > 165 °C
reverse
battery
protection
43V
timer
300 us
-
+
Min. pulse
IN
4
Ifb
OUT
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IR3312(S)
Lead Assignments
3 (Vcc)
3 (Vcc)
1 - In
2 - Ifb
3 - Vcc (tab)
4 - NC
5 - Out
12345
12345
5 Lead - TO220
IR3312
Part Number
5 Lead - D
2
PAK (SMD220)
IR3312S
Vcc-Vin
Vcc-Vin
max
Vcc-Vin1
max
Vcc-Vin (op)
Vih
Vil
Vhys
Iin
Iin
Vcc-Vin
Vcc
In
IR3312
Vcc-Vout
Vcc-Vout
max
Vclamp1
Vclamp2
Vcc
90%
max
Iin1,2
Iin(on)
VIfb
Ifb
Ifb
Out
Iout
Iout
max
-Ids
cont.
-Ids
pulsed
Iout
85°C
Isd
Iq
Vcc-Vout
5V
10 %
DV/dt(on)
Td on
Tr1
Tr2
Figure 1 - Voltages and currents definitions
Figure 2 - Switching time definitions (turn-on)
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