AW32812CSR [AWINIC]
Over-Voltage Protection Load Switch with Surge Protection;型号: | AW32812CSR |
厂家: | AWINIC |
描述: | Over-Voltage Protection Load Switch with Surge Protection |
文件: | 总20页 (文件大小:1499K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
Over-Voltage Protection Load Switch with Surge Protection
FEATURES
GENERAL DESCRIPTION
Surge protection
IEC 61000-4-5: > 100V
The AW328xx family OVP load switch features
surge protection, an internal clamp circuit protects
the device from surge voltages up to 100V.
Integrated low Rdson nFET switch: typical 28mΩ
4.5A continuous current capability
The AW328xx features an ultra-low 28m (typ.)
Rdson nFET load switch. When input voltage
exceeds the OVP threshold, the switch is turned off
very fast to prevent damage to the protected
downstream devices. The IN pin is capable of
withstanding fault voltages up to 29VDC.
Default Over-Voltage Protection (OVP) threshold
AW32801: 5.95V
AW32805: 6.8V
AW32809: 9.98V
AW32812: 14V
The default OVP threshold is 5.95V (AW32801),
6.8V (AW32805), 9.98V (AW32809) and 14V
(AW32812), the OVP threshold can be adjusted
from 4V to 20V through external OVLO pin.
OVP threshold adjustable range: 4V to 20V
Input system ESD protection
IEC 61000-4-2 Contact discharge: ±8kV
IEC 61000-4-2 Air gap discharge: ±15kV
The device features an open-drain output ACOK,
Input maximum voltage rating: 29VDC
Fast turn-off response: typical 125ns
Over-Temperature Protection (OTP)
Under-Voltage Lockout (UVLO)
when VIN_UVLO < VIN < VIN_OVLO and the switch is
on, ACOK will be driven low to indicate a good
power input, otherwise it is high impedance.
This device features over-temperature protection
that prevents itself from thermal damaging.
1.34mm × 1.78mm WLCSP-12 package
The AW328xx is available in a RoHS compliant
12-bump 1.34mm × 1.78mm WLCSP.
APPLICATIONS
Smartphones
Tablets
5V to 20V Charging Ports
TYPICAL APPLICATION CIRCUIT
USB
Port
Charger
OUT
IN
COUT
1µF
CIN
0.1µF
50V
TVS
Battery
AW32801
AW32805
AW32809
AW32812
R1
R2
PMIC
OVLO
EN
Controller
ACOK
GND
Optional
Figure 1 Typical Application Circuit of AW328XX
Note: R1 and R2 are used for OVP threshold adjustment, to use default OVP threshold, connect OVLO to ground.
All trademarks are the property of their respective owners.
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1
Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
DEVICE COMPARISON TABLE
VIN_OVLO (V)
Min.
6.66
VIN_OVLO
hysteresis (mV)
Device
Condition
VIN rising
VIN rising
VIN rising
VIN rising
Typ.
6.80
9.98
14.0
5.95
Max.
6.94
AW32805
AW32809
AW32812
AW32801
150
210
300
100
9.78
13.7
5.83
10.18
14.3
6.07
PIN CONFIGURATION AND TOP MARK
AW328XX Pin Configuration
(TOP VIEW)
AW328XX MARKING
(TOP VIEW)
2
3
4
2
3
4
1
1
OUT
GND
EN
OUT
A
B
C
A
B
C
28XX
YYYY
IN
IN
GND
GND
ACOK
OVLO
OUT
IN
28XX – AW32801/AW32805/AW32809/AW32812
YYYY – Production Tracking Code
Figure 2 Pin Configuration and Top Mark
PIN DEFINITION
PIN
NAME
DESCRIPTION
A1
Enable pin, active low
EN
B1
Power good flag, active-low, open-drain
OVP threshold adjustment pin
Switch input and device power supply
Switch output
ACOK
OVLO
IN
C1
C2, C3, B3
A2, A3, B2
A4, B4, C4
OUT
GND
Device ground
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
FUNCTIONAL BLOCK DIAGRAM
OUT
IN
Clamp
Detect
Gate Driver &
Charge pump
VIN Divider
Selection
OVLO
OV comp
Logic Control
ACOK
Bandgap
& Ibias
UV&OT comp
Oscillator
EN
GND
Figure 3 FUNCTIONAL BLOCK DIAGRAM
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
TYPICAL APPLICATION CIRCUITS
USB
Port
Charger
OUT
IN
COUT
1µF
CIN
0.1µF
50V
TVS
Battery
PMIC
AW32801
AW32805
AW32809
AW32812
OVLO
EN
Controller
ACOK
GND
Figure 4 AW328XX Application Circuit
(Using default OVP threshold by connecting OVLO to ground)
USB
Port
Charger
OUT
IN
COUT
1µF
CIN
0.1µF
50V
TVS
Battery
AW32801
AW32805
AW32809
AW32812
R1
R2
PMIC
OVLO
EN
Controller
ACOK
GND
Figure 5 AW328XX Application Circuit
(Using external OVP threshold by connecting OVLO to R1 and R2)
Notice for Typical Application Circuits:
1. When the default OVP threshold is used, connect OVLO pin to GND directly or through a 0Ω resistor.
OVLO pin cannot be left floating.
2. If R1 and R2 are used to adjust the OVP threshold, in order to speed up the OVP response, R1 + R2 <
100kΩ is recommended. It is better to use 1% precision resistors to improve the OVP threshold precision.
3. If ACOK is not used, it can be left floating, or short to GND.
4. CIN = 0.1μF is recommended for typical application, larger CIN is also acceptable. The rated voltage of CIN
should be larger than the TVS maximum clamping voltage, if no TVS is applied and only AW328XX is
used, the rated voltage of CIN should be 50V.
5. COUT = 1μF is recommended for typical application, larger COUT is also acceptable. The rated voltage of
COUT should be larger than the OVP threshold. For example, if the OVP threshold is 6.8V, the rated
voltage of COUT should be 10V or higher.
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
ORDERING INFORMATION
Moisture
Marking Sensitivity
Level
Environmental
Information
Part Number
Temperature
-40°C ~85°C
-40°C ~85°C
-40°C ~85°C
-40°C ~85°C
Package
Delivery Form
1.34mm×1.78mm
WLCSP-12
3000 units/
AW32801CSR
2801
2805
2809
2812
MSL1
MSL1
MSL1
MSL1
ROHS+HF
Tape and Reel
1.34mm×1.78mm
WLCSP-12
3000 units/
AW32805CSR
AW32809CSR
AW32812CSR
ROHS+HF
ROHS+HF
ROHS+HF
Tape and Reel
1.34mm×1.78mm
WLCSP-12
3000 units/
Tape and Reel
1.34mm×1.78mm
WLCSP-12
3000 units/
Tape and Reel
AW328XX
Shipping
R: Tape & Reel
Package Type
CS: CSP
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
ABSOLUTE MAXIMUM RATINGS(NOTE1)
PARAMETERS
RANGE
Supply Voltage Range VIN
-0.3V to 29V
-0.3V to 29V
-0.3V to 6V
OVLO
Input Voltage Range
Output Voltage Range
EN
-0.3V to 6V
See(NOTE 2)
ACOK
OUT
Maximum Input Peak Pulse Voltage VIN_PUL (20μs pulse width, repeat
42V
100 times)
(NOTE 3)
Maximum Continuous Current From IN to OUT ISW
4.5A
8A
Peak Current From IN to OUT IPEAK (10ms)
Maximum Continuous Forward Current Through the Switch Body Diode
IDIODE
1.5A
(NOTE 4)
Junction-to-ambient Thermal Resistance θJA
85°C /W
-40°C to 85°C
165°C
Operating Free-air Temperature Range
Maximum Junction Temperature TJMAX
Storage Temperature TSTG
-65°C to 150°C
260°C
Lead Temperature (Soldering 10 Seconds)
ESD
Contact Discharge
IEC61000-4-2 System ESD on IN (NOTE 5)
Air Gap Discharge
±8kV
±15kV
±4kV
Human Body Model (All pins, per MIL-STD-883J Method 3015.9) (NOTE 6)
Charged Device Model (All pins, per JEDEC EIA/JESD22-C101F)
Machine Model (All pins, per JEDEC EIA/JESD22-A115)
Latch-Up
±1.5kV
±400V
+IT:800mA
-IT:-800mA
Test Condition: JEDEC STANDARD No.78C SEPTEMBER 2011
NOTE1: Conditions out of those ranges listed in "absolute maximum ratings" may cause permanent damages
to the device. In spite of the limits above, functional operation conditions of the device should within the
ranges listed in "recommended operating conditions". Exposure to absolute-maximum-rated conditions for
prolonged periods may affect device reliability.
NOTE2: -0.3V to 29V or VIN + 0.3V, whichever is smaller.
NOTE3: Limited by thermal design.
NOTE4: Thermal resistance from junction to ambient is highly dependent on PCB layout.
NOTE5: Test is under CIN = 1μF.
NOTE6: The human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
ELECTRICAL CHARACTERISTICS
TA = -40°C to 85°C unless otherwise noted. Typical values are guaranteed for VIN = 5V, CIN = 0.1μF, IIN≤ 4.5A
and TA = 25°C .
PARAMETER
TEST CONDITION
MIN
TYP
MAX UNIT
VIN_CLAMP
VIN
Rdson
IQ
Input Clamp Voltage
Input Voltage Range
Switch On Resistance
Input Quiescent Current
IIN = 10mA
30.3
V
2.5
28
37
V
VIN = 5V, IOUT = 1A, TA = 25°C
VIN = 5V, IOUT = 0A
28
65
mΩ
μA
100
Input
Current
at VOVLO = 3V, VIN = 5V, VOUT
0V
=
IIN_OVLO
VOVLO_TH
VOVLO_RNG
69
110
1.24
20
μA
V
Over-voltage Condition
OVLO Set Threshold
2.5V < VIN < 20V
1.16
4
1.20
OVP Threshold Adjustable
Range
2.5V < VIN < 20V
V
VIN Rising
Hysteresis
0.3
0.42
0.1
0.50
External
OVLO
Select
VOVLO_SEL
V
Threshold
IOVLO
COUT
OVLO Pin Leakage Current VOVLO = VOVLO_TH
Output Load Capacitance
-0.1
0.1
μA
μF
100
Protection
VIN Rising
VIN Falling
VIN Rising
VIN Falling
VIN Rising
VIN Falling
VIN Rising
VIN Falling
6.66
6.51
9.78
9.57
13.7
13.4
5.83
5.73
6.80
6.65
9.98
9.77
14.0
13.7
5.95
5.85
2.25
2.10
130
6.94
10.18
14.3
AW32805
AW32809
Default OVP Trip Level
AW32812
VIN_OVLO
V
V
6.07
AW32801
VIN Rising
UVLO Trip Level
2.40
2.20
VIN_UVLO
VIN Falling
TSDN
Shutdown Temperature
°C
°C
Shutdown
Hysteresis
Temperature
TSDN_HYS
20
Digital Logical Interface
VOL
ISINK = 1mA
VIO = 5V, ACOK De-asserted
0.4
0.5
V
μA
V
ACOK Output Low Voltage
ACOK Leakage Current
EN Input High Voltage
EN Input Low Voltage
EN Leakage Current
ILEAK_ACOK
-0.5
1.2
VIH
VIL
0.5
10
V
ILEAK_EN
VEN = 5V
-1
μA
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
ELECTRICAL CHARACTERISTICS (CONTINUED)
TA = -40°C to 85°C unless otherwise noted. Typical values are guaranteed for VIN = 5V, CIN = 0.1μF, IIN≤ 4.5A
and TA = 25°C .
PARAMETER
TEST CONDITION
MIN
TYP
MAX UNIT
Timing Characteristics (Figure 6)
From VIN > VIN_UVLO to 10%
VOUT, EN Low
tDEB
Debounce Time
Start-up Time
15
30
ms
ms
From VIN > VIN_UVLO to ACOK
low, EN Low
tSTAT
RL = 100Ω, CL = 22μF, VOUT
from 10% VIN to 90% VIN
tON
Switch Turn-on Time
Switch Turn-off Time
1
ms
ns
RL = 100ΩCL = 0μF, VIN
>
tOFF
125
VIN_OVLO to VOUT Stop Rising
TIMING DIAGRAM
OVP trip level
VIN
tDEB
tDEB
VOUT
tON
tON
tOFF
VEN
VACOK
tSTART
tSTART
Figure 6 AW328XX Timing Diagram
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
TYPICAL CHARACTERISTICS
Table 1 TABLE OF FIGURES
INDEX
FIG No.
Normalized Rdson vs. Output Current
Normalized Rdson vs. Temp. (IOUT = 1A)
Normalized Rdson vs. Input Voltage (IOUT = 1A)
Input Supply Current vs. Supply Voltage
Normalized Internal OVP Threshold vs. Temp.
Normalized External OVLO Set OVP Threshold vs. Temp.
Normalized Debounce Time vs. Temp.
Over-Voltage Response (AW32805)
Power-up (COUT = 1μF, 100mA load)
Power-up (COUT = 100μF, 100mA load)
108V Surge Without Device
FIGURE 7
FIGURE 8
FIGURE 9
FIGURE 10
FIGURE 11
FIGURE 12
FIGURE 13
FIGURE 14
FIGURE 15
FIGURE 16
FIGURE 17
FIGURE 18
108V Surge With Device (AW32805)
VIN = 5V, VEN = 0V, VOVLO = 0V, CIN = 0.1μF, COUT = 1μF, and TA = 25℃ unless otherwise specified.
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2.0
1.5
1.0
0.5
0.0
Normalized to TA = 25°C
Normalized to IOUT = 1A
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
Output Current (A)
-40
-15
10
35
60
85
Temperature (°C)
Figure 8. Normalized Rdson vs. Temp. (IOUT = 1A)
Figure 7. Normalized Rdson vs. Output Current
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
TYPICAL CHARACTERISTICS (CONTINUED)
VIN = 5V, VEN = 0V, VOVLO = 0V, CIN = 0.1μF, COUT = 1μF, and TA = 25℃ unless otherwise specified.
3.0
2.5
2.0
1.5
1.0
0.5
0.0
300
250
200
150
100
50
–40°C
25°C
85°C
Normalized to VIN = 5V
0
0
2
4
6
8 10 12 14 16 18 20
0
5
10
15
20
25
30
Input Voltage (V)
Input Voltage (V)
Figure 9. Normalized Rdson vs. Input Voltage (IOUT = 1A)
Figure 10. Input Supply Current vs. Supply Voltage
1.10
1.10
Normalized to TA = 25°C
Normalized to TA = 25°C
1.05
1.05
1.00
0.95
0.90
1.00
0.95
0.90
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
Figure 11. Normalized Internal OVP Threshold vs.
Temp.
Figure 12. Normalized External OVLO Set OVP
Threshold vs. Temp.
2.00
8V
VIN
5V / div
5V
Normalized to TA = 25°C
1.50
VOUT
5V / div
1.00
0.50
0.00
ACOK
2V / div
IOUT
100mA / div
-40
-15
10
35
60
85
10µs / div
Temperature (°C)
Figure 13. Normalized Debounce Time vs. Temp.
Figure 14. Over-Voltage Response (AW32805)
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
TYPICAL CHARACTERISTICS (CONTINUED)
VIN = 5V, VEN = 0V, VOVLO = 0V, CIN = 0.1μF, COUT = 1μF, and TA = 25℃ unless otherwise specified.
VIN
VIN
5V / div
5V / div
VOUT
VOUT
5V / div
5V / div
ACOK
2V / div
ACOK
2V / div
IOUT
IOUT
500mA / div
100mA / div
5ms / div
5ms / div
Figure 15. Power-up (COUT = 1μF, 100mA load)
Figure 16. Power-up (COUT = 100μF, 100mA load)
VIN
10V / div
VOUT
10V / div
IIN
20V / div
20A / div
20µs / div
10µs / div
Figure 17. 108V Surge Without Device
Figure 18. 108V Surge With Device (AW32805)
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
DETAILED FUNCTIONAL DESCRIPTION
Device Operation
If the AW328xx is enabled and the input voltage is between UVLO and OVP threshold, the internal charge
pump begins to work after debounce time, the gate of the nFET switch will be slowly charged high till the
switch is fully on. ACOK will be driven low about 30ms after VIN valid, indicating the switch is on with a good
power input. If the input voltage exceeds the OVP trip level, the switch will be turned off in about 125ns. If EN
is pulled high, or input voltage falls below UVLO threshold, or over-temperature happens, the switch will also
be turned off.
Surge Protection
The AW328xx integrates a clamp circuit to suppress input surge voltage. For surge voltages between VIN_OVLO
and VIN_CLAMP, the switch will be turned off but the clamp circuit will not work. For surge voltages greater than
VIN_CLAMP, the internal clamp circuit will detect surge voltage level and discharge the surge energy to ground.
The device can suppress surge voltages up to 100V.
Over-Voltage Protection
If the input voltage exceeds the OVP rising trip level, the switch will be turned off in about 125ns. The switch
will remain off until VIN falls below the OVP falling trip level.
OVP Threshold Adjustment
If OVLO pin is not grounded, and by connecting external resistor divider to OVLO pin as shown in the typical
application circuit, between IN and GND, the OVP threshold can be adjusted as following:
R1+R2
VIN_OVLO
=
VOVLO_TH
R2
The adjustment range is 4V to 20V. When the OVLO pin voltage VOVLO exceeds VOVLO_SEL(0.42V typical),
VOVLO is compared with the reference voltage VOVLO_TH (1.2V typical) to judge whether input supply is
over-voltage. For example, if we select R1 = 51kΩ and R2 = 12.4kΩ, then the new OVP threshold calculated
from the above formula is 6.14V.
ACOK Output
The device features an open-drain output ACOK, it should be connected to the system I/O rail through a
pull-up resistor. If the device is enabled and VIN_UVLO < VIN < VIN_OVLO, ACOK will be driven low indicating the
switch is on with a good power input. If OVP, UVLO, or OT occurs, or EN is pulled high, the switch will be
turned off and ACOK will be pulled high.
USB On-The-Go (OTG) Operation
If VIN = 0V and OUT is supplied by OTG voltage, the body diode of the load switch conducts current from OUT
to IN and the voltage drop from OUT to IN is approximately 0.7V. When VIN > VIN_UVLO, internal charge pump
begins to open the load switch after debounce time. After switch is fully on, current is supplied through switch
channel and the voltage drop from OUT to IN is minimum.
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
PCB LAYOUT CONSIDERATION
To make full use of the performance of AW328XX, the guidelines below should be followed.
1. All the peripherals should be placed as close to the device as possible. Place the input capacitor CIN on
the top layer (same layer as the AW328XX) and close to IN pin, and place the output capacitor COUT on
the top layer (same layer as the AW328XX) and close to OUT pin.
2. Red bold paths on figure 4 and 5 are power lines that will flow large current, please route them on PCB as
straight, wide and short as possible.
3. If R1 and R2 are used, route OVLO line on PCB as short as possible to reduce parasitic capacitance.
4. The power trace from USB connector to AW328XX may suffer from ESD event, keep other traces away
from it to minimize possible EMI and ESD coupling.
5. Use rounded corners on the power trace from USB connector to AW328XX to decrease EMI coupling.
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
TAPE AND REEL INFORMATION
Carrier Tape
pin1
Unit: mm.
Pin 1 direction
Pin 1
User Direction of Feed
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
Reel
Unit: mm
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
PACKAGE DESCRIPTION
BOTTOM VIEW
e2
TOP VIEW
E
e3
Ball
A1
C
B
e3
D
12X Ø0.268±0.020
A
1
2
3
4
Symbol
NOM
0.575
0.195
0.340
0.040
1.340
1.780
0
Tolerance
±0.055
±0.020
±0.025
±0.010
±0.025
±0.025
NA
A
SIDE VIEW
A1
A2
A3
D
E
e1
0.200
0.400
NA
NA
e2
e3
Unit: mm
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
LAND PATTERN DATA
1.200
0.200
0.400
0.400
0.800
Ø0.240
Copper Pad
Diameter
Ø0.340
Solder Mask
Opening
NSMD Pad Type
Unit: mm
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
REFLOW
Figure 19
Package Reflow Standard Profile
Reflow Note
Spec
Average ramp-up rate (217°C to peak)
Time of Preheat temp. (from 150°C to 200°C )
Time to be maintained above 217°C
Peak Temperature
Max. 3°C /sec
60-120sec
60-150sec
>260°C
Time within 5°C of actual peak temp
Ramp-down rate
20-40sec
Max. 6°C /sec
Max. 8min
Time from 25°C to peak temp
NOTE 1: All data are compared with the package-top temperature, measured on the package surface;
NOTE 2: AW328XX adopted the Pb-Free assembly.
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
REVISION HISTORY
Version
V0.9
Date
Change Record
November 2016
October 2016
Datasheet v0.9 released.
Datasheet v1.0 released.
V1.0
1. Datasheet template changed.
2. Input voltage range modified.
3. Notice for typical application circuits added.
V1.1
February 2018
4. VIN_PUL, IPEAK, IDIODE added in absolute maximum ratings table
5. PCB layout consideration added.
6. Land pattern data added.
7. Reflow information added.
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
AW32801/AW32805/
AW32809/AW32812
Feb. 2018 V1.1
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Copyright © 2014 SHANGHAI AWINIC TECHNOLOGY CO., LTD
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