AUIR3240S_15 [INFINEON]
LOW QUIESCENT CURRENT MOSFET DRIVER;
| 型号： | AUIR3240S_15 |
| 厂家： | 
Infineon |
| 描述： | LOW QUIESCENT CURRENT MOSFET DRIVER 驱动 |
| 文件： | 总17页 (文件大小：452K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Automotive grade
AUIR3240S
LOW QUIESCENT CURRENT MOSFET DRIVER
Features
Product Summary
•
•
•
•
•
•
Very low quiescent current on state
Boost converter with integrated diode
Operating voltage 4-36V
Vgate 11.5V min.
Iqcc On 50µA max.
Standard level gate voltage
Wide operating voltage 4-36V
Temperature monitoring with NTC interface
Lead-Free, Halogen Free, RoHS compliant
Applications
•
Battery switch for Stop and Start system
Package
Description
The AUIR3240S is a high side mosfet driver for battery
switch application where a very low quiescent current is
required when the driver is on. The AUIR3240S is a
combination of a boost DC/DC converter using an external
inductor and a gate driver. It drives standard level Mosfet
even at low battery voltage. The input is active low to
reduce current consumption.
SO8
Typical Connection
Main Battery
Loads
GATE
NTC
NTC
Cout
VCC
SW
RS
Rs Ntc
V DG IN
R Ntc NTC EN
500µH
Current measurement
/IN
Rin
Rs
GND
1
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AUIR3240S
†
Qualification Information
Automotive
(per AEC-Q100††)
Qualification Level
Comments: This family of ICs has passed an Automotive
qualification. IR’s Industrial and Consumer qualification level
is granted by extension of the higher Automotive level.
MSL2, 260°C
SOIC-8L
Moisture Sensitivity Level
(per IPC/JEDEC J-STD-020)
Class M0 (+/-50V)
(per AEC-Q100-003)
Class H0 (+/-50V)
Machine Model
ESD
Human Body Model
Charged Device Model
(
)
per AEC-Q100-002
Class C4 (+/-1000V)
(per AEC-Q100-011)
IC Latch-Up Test
RoHS Compliant
Yes
Yes
†
††
Qualification standards can be found at International Rectifier’s web site http://www.irf.com/
Exceptions to AEC-Q100 requirements, if any, are noted in the qualification report.
2
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AUIR3240S
Absolute Maximum Ratings
Absolute maximum ratings indicate sustained limits beyond which damage to the device may occur. All voltage parameters
are referenced to Ground lead. (Tambient=25°C unless otherwise specified).
Symbol
Vcc-gnd
Vgate-Vsw
Vsw-gnd
Vrs-gnd
Vntc
Vntc_en
Vin
Isw
Parameter
Maximum Vcc voltage
Maximum Vgate-Vsw voltage
Maximum Sw voltage
Maximum Rs voltage
Maximum Ntc voltage
Maximum NTC_EN voltage
Maximum IN pin voltage
Maximum continuous current in SW pin
Max. storage & operating temperature junction temperature
Min. Max. Units
-0.3
-1
65
65
65
6
65
6
6
200
150
-0.3
-0.3
-0.3
-0.3
-0.3
V
mA
°C
Tj max.
-40
Thermal Characteristics
Symbol
Parameter
Typ. Max. Units
100 °C/W
Rth
Thermal resistance junction to ambient
Recommended Operating Conditions
Symbol
VIH
Parameter
Min. Max. Units
High level input voltage
Low level input voltage
Serial NTC resistor
Input resistor
2.5
0
4
5.5
0.9
10
V
VIL
Rs NTC
Rin
kΩ
4
10
3
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AUIR3240S
Static Electrical Characteristics
Tj=-40..125°C, Vcc=6..16V (unless otherwise specified), typical value are given for Vcc=14V and Tj=25°C.
Symbol
Vcc op.
Iq Vcc Off
Parameter
Operating voltage range
Supply current when Off, Tj=25°C
Supply current when Off, Tj=125°C
Supply current when On, Tj=25°C
Supply current when On, Tj=125°C
Min. Typ. Max. Units Test Conditions
85
110
2
3
6
12
17
55
30
2
12.5
1.1
1
4
15
50
36
120
200
10
10
20
40
20
60
65
2.5
13.5
1.3
1.2
1.2
13
15
20
30
35
55
1
V
See page 10
Vin=5V, NTC_EN=0V
K1 off, K2 on
Vin=0V, NTC_EN=0V
K1 off, see page 8
Vin=0V, Vgate=14V
K1 off, see page 8
I=10mA
Iq Vcc On
µA
Iq gate On Quiescent current on Gate, Tj=25°C
Quiescent current on Gate, Tj=125°C
Vbr gate
OV
Breakdown voltage between and Vcc
Over-voltage protection
Input current
V
Iin
µA
Vin=5V
Vin th
Vgs th
Vrs th
IN threshold voltage
1
Gate output threshold
Rs threshold, Tj=-40°C
Rs threshold, Tj=25°C
Rs threshold, Tj=125°C
Rdson of K1, Tj=-40°C
Rdson of K1, Tj=25°C
Rdson of K1, Tj=125°C
Rdson of K2, Tj=-40°C
Rdson of K2, Tj=25°C
Rdson of K2, Tj=125°C
Forward voltage of rectifier diode
Quiescent current in NTC
11.5
0.9
0.85
0.75
Igate=0µA
V
0.95
8
Rdson K1
Rdson K2
I=100mA
11
15
20
25
40
0.7
0.1
Ω
Vf
Iq ntc
V
I=100mA
V NTC=16V,
Vntc_en=0V
Vntc>6V
1
µA
1.15
1.9
1.9
2.2
I Ntc
Out Ntc current R ntc=7k, Vdg in=5V
1
1.5
2.05
mA
V
Vth_ntc_en NTC_EN threshold voltage
I ratio ntc
I=500µA
Current ratio between NTC_EN and NTC
Vntc>6V
Timing Converter Characteristics
Tj=-40..125°C, Vcc=6..16V (unless otherwise specified), typical value are given for Vcc=14V and Tj=25°C.
Symbol
Toff
Tdon K1
Tdoff K1
Parameter
Off time
Turn-on delay of K1
Turn-off delay of K1
Min. Typ. Max. Units Test Conditions
5
7.5
0.2
10
10
µs
Switching Characteristics
Tj=-40..125°C, Vcc=6..16V (unless otherwise specified), typical value are given for Vcc=14V and Tj=25°C.
Symbol
Tdon K2
Tf K2
Parameter
Turn-on delay of K2
Fall time of K2 90% to 10% of Vgate-Vcc
Gate low short circuit pulsed current
Min. Typ. Max. Units Test Conditions
1
2.5
6
4
20
C=100nF
µs
Iout- K2
100
350
mA
Vgate=14V
4
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AUIR3240S
Lead Definitions
Pin number
Symbol Description
1
NTC
An NTC resistor can be connected between this pin and the Vcc line close to the tab
to sense the temperature of the Mosfet
NTC_EN is the input of the NTC system.
Active low input pin to enable the boost converter or short the gate to Vcc
Ground pin
Current sense input pin
Output of K1
2
3
4
5
6
7
8
NTC_EN
/IN
GND
RS
SW
VCC
GATE
Power supply
Output of the boost converter
Lead Assignments
8 7 6 5
1- NTC
2- NTC_EN
3- /IN
4- GND
5- RS
6- SW
1 2 3 4
SO8
7- VCC
8- GATE
5
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AUIR3240S
Block diagram
Main Battery
Gate
NTC
75V
NTC
NTC EN
6V
17V
+
-
K2
12.5V
75V
Vcc
75V
D
75V
SW
Current mirror
500µH
Vcc>OV
K1
/IN
6V
Rs
toff
7.5µs
+
-
1V
6V
50Ω
Gnd
6
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AUIR3240S
Description
The topology of the AUIR3240S is a boost DC/DC converter working in current mode. K1 is switched on when the gate
voltage is lower than Vgs threshold. When Rs pin reaches Vrs th, K1 is turned off and the inductor charge the gate
capacitor through D. The system cannot restart during Toff after Vrs th has been reached. The DC/DC restart only when
the Gate and the Vcc voltage difference is lower than 12.5V in order to achieve low quiescent current on the power
supply.
To turn off the power Mosfet, the input must be pull high. Then the DC/DC converter is turned and K2 shorts the gate to
Vcc.
Vin
Ipeak
Irs
Vgs threshold
Vgs
Parameters definition
Current definition
Iq gate On
Iq NTC
NTC
GATE
Iq Vcc Off
Iq Vcc On
I out leakage
VCC
SW
NTC EN
/IN
RS
GND
7
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AUIR3240S
Timing definition
Vin
T
Ipeak
Ik1
Toff
Vgate peak
Vgsth
Vgate-
Vcc
Ipeak=Vrs th/Rs
IL
tdischarge
ton
Vgs threshold
Vgate-Vcc
Tdon K1
Tdoff K1
Vrsth
Vrs
Low quiescent current operation when On.
The AUIR3240S is able to operate with a very low quiescent current on the Vcc pin. Nevertheless the supply current
depends also on the leakage of the power mosfet named “I out leakage” on the diagram below.
The leakage current is given when K1 is off. When K1 is on, the current flowing in Vcc is the current charging the inductor.
Therefore the average current on the Vcc is the combination of the current when K1 is ON and OFF. The average current
on the Vcc pin can be calculated using:
8
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AUIR3240S
With Vgate: the average voltage on the output.
Vgate peak can be calculated by:
During On operation, the DC/DC works in pulse mode, meaning each time the Vgate-Vcc voltage comes below 12.5V, the
AUIR3240S switches on K1 to recharge the gate voltage. When the Iout leakage is low enough to maintain the DC/DC in
discontinuous mode, the frequency is calculate by:
Peak current control
The current in the inductor is limited by the 1V comparator which monitors the voltage across Rs. Due to the delay in the
loop (tdoff K1), the inductor current will exceed the threshold set by:
At low voltage, the current waveform in the inductor is not anymore linear, but exponential because the sum of the resistor
of K1, the inductor and RS are not any more negligible.
Vrsth
Vrs
t Vrsth
t on
tdoff K1
The peak current and ton can be calculated as follow:
Where Rl is the resistor of the inductor
With :
The peak current can be solved by:
9
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AUIR3240S
Output voltage Characteristic
In most of case when the output of the AUIR3240S is able to recharge the capacitor higher than Vgsth, the output voltage
will oscillate between Vgsth and Vgate peak. Vgate peak can be calculated by:
Minimum operating voltage
While the AUIR3240S operating voltage is specified between 4V and 36V. The minimum voltage is limited by the fact that
the Rs voltage must reach the Vrsth taking account all resistors which limit the inductor current.
Over-Voltage protection
The AUIR3240S integrates an over-voltage protection in order to protect K1. When Vcc exceed the Over-voltage
threshold, the DC/DC is stopped.
NTC interface
The NTC interface allows the system to have a temperature measurement of the mosfet using one resistor and one NTC.
The NTC must be connected to Vcc and close to the tab of the power Mosfet to have a good temperature sensing. The
system works as a current mirror between NTC_EN and NTC pins. The typical ratio is 2, with 500µA flowing into
NTC_EN, 1mA will flow in the NTC. The current in the NTC is fixed by adjusting R_Ntc and V_Dg_In. With 7k and 5V, the
current in the NTC will be 1mA. The NTC function activated only if NTC_EN is powered.
If the NTC feature function is not used, NTC EN and NTC must be remained floating. The low consumption is achieved
only when the NTC interface is not activated.
Output current measurement
The average current into Rs can be measured by adding a low pass filter before the ADC of the micro controller. Then the
average output current can be evaluated using :
I out av = I Rs av * Vcc / ( Vgate - Vcc )
Knowing the output current can be useful to do a diagnostic on the power Mosfet. If the gate is short, the output current
will be significantly higher than in normal operation.
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AUIR3240S
Figures are given for typical value, Vcc=14V and Tj=25°C otherwise specified
4
3
2
1
0
4
3
2
1
0
-50
0
50
100
0
5
10
15
20
Tj, junction temperature (°C)
Vcc, Supply voltage (V)
Figure 1 – Iq Vcc on (µA) Vs Tj (°C)
Figure 2 – Iq Vcc on (µA) Vs Vcc(V)
15
10
5
6
5
4
3
2
1
0
0
-50
0
50
100
0
5
10
15
20
Tj, junction temperature (°C)
Vcc, Supply voltage (V)
Figure 3 – Iq Gate on (µA) Vs Tj (°C)
Figure 4 – Iq Gate on (µA) Vs Vcc(V)
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AUIR3240S
150
100
50
1000
900
800
700
600
500
400
300
200
100
0
0
-50
0
50
100
-50
0
50
100
Tj, junction temperature (°C)
Tj, junction temperature (°C)
Figure 5 – Iq Vcc off (µA) Vs Tj (°C)
Figure 6 – Vf (mV) Vs Tj (°C)
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AUIR3240S
Case Outline – SO8
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AUIR3240S
Tape & Reel SO8
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AUIR3240S
Part Marking Information
Ordering Information
Standard Pack
Form
Base Part Number
Package Type
Complete Part Number
Quantity
95
Tube
Tape and reel
AUIR3240S
AUIR3240S
SOIC8
2500
AUIR3240STR
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AUIR3240S
IMPORTANT NOTICE
Unless specifically designated for the automotive market, International Rectifier Corporation and its subsidiaries (IR)
reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and
services at any time and to discontinue any product or services without notice. Part numbers designated with the “AU”
prefix follow automotive industry and / or customer specific requirements with regards to product discontinuance and
process change notification. All products are sold subject to IR’s terms and conditions of sale supplied at the time of order
acknowledgment.
IR warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with
IR’s standard warranty. Testing and other quality control techniques are used to the extent IR deems necessary to
support this warranty. Except where mandated by government requirements, testing of all parameters of each product is
not necessarily performed.
IR assumes no liability for applications assistance or customer product design. Customers are responsible for their
products and applications using IR components. To minimize the risks with customer products and applications,
customers should provide adequate design and operating safeguards.
Reproduction of IR information in IR data books or data sheets is permissible only if reproduction is without alteration and
is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with
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service voids all express and any implied warranties for the associated IR product or service and is an unfair and
deceptive business practice. IR is not responsible or liable for any such statements.
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the body, or in other applications intended to support or sustain life, or in any other application in which the failure of the
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IR products are neither designed nor intended for use in automotive applications or environments unless the specific IR
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designation “AU”. Buyers acknowledge and agree that, if they use any non-designated products in automotive
applications, IR will not be responsible for any failure to meet such requirements.
For technical support, please contact IR’s Technical Assistance Center
http://www.irf.com/technical-info/
WORLD HEADQUARTERS:
101 N. Sepulveda Blvd., El Segundo, California 90245
Tel: (310) 252-7105
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AUIR3240S
Revision History
Revision
Date
Notes/Changes
A
B
December 10th, 2011
March, 28th 2012
Initial release
Page4 correct temperature condition
for Vrsth +125°C
Update maximum operating
temperature
C
April, 2nd 2012
D
E
F
July, 17th 2012
November, 19th 2012
October, 17th 2013
Update page 4, Tdon K1 typ.
Update formula page 9 tVrsth
Update NTC interface current
page10
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