AAT4687_1_201963B.pdf

DATA SHEET
AAT4687-1: Over-Voltage Protection Switch
Applications
Description
 Cell phones
The AAT4687-1 OVPSwitch™ is a P-channel MOSFET power
switch with precise over-voltage protection control, designed to
protect low-voltage systems against high-voltage faults up to
+28 V. If the input voltage exceeds the fixed over-voltage
threshold, the P-channel MOSFET switch is turned off to prevent
the output load circuits from damage. The AAT4687-1 is available
with an internally programmed over-voltage trip point.
 Digital still cameras
 GPS
 MP3 players
 Personal data assistants (PDAs)
 USB hot-swap/live-insertion devices
Features
 Input voltage range up to 28 V
 Over-voltage protection threshold:
 5.9 V typical
 6 V maximum
 Fixed over-voltage protection threshold
 2 V typical under-voltage lockout threshold
 Fast OVP response:
 0.7 s typical to over-voltage transient
The AAT4687-1 includes an under-voltage lockout (UVLO)
protection circuit, which puts the device into sleep mode at low
input voltages, consuming less than 1 A of current. The
AAT4687-1 also includes an enable pin (EN) to enable or disable
the device and an over-voltage protection (OVP), overtemperature protection (OTP) fault indicator (FLT).
The AAT4687-1 is offered in a small 10-pin, 2.2 mm  2.0 mm
SC70JW package, and is specified for operation over the 40 °C
to +85 °C ambient temperature range.
A typical application circuit is shown in Figure 1. The pin
configuration is shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
 Low operation quiescent current:
 45 A typical
 1 A maximum in shutdown (disabled)
 Thermal shutdown protection
 120 m typical (140 m Max.) RDS(ON) at 5 V
VIO + 5 V
VIN
2.2 V ~ VOVP_MIN
VOUT
IN
 OVP, OTP fault indicator
 1.8 A maximum continuous current
 Temperature range: 40 °C to +85 °C
OUT
COUT
1 μF
AAT4687-1
CIN
1 μF
FLT
EN
GND
Fault Flag
 SC70JW (10-pin, 2.2 mm  2.0 mm) package (MSL1, 260 ºC
per JEDEC J-STD-020)
tc267
Figure 1. AAT4687-1 Typical Application Circuit
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201963B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 2, 2014
1
DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
N/C
GND
FLT
EN
IN
1
10
2
9
3
8
4
7
5
GND
GND
GND
OUT
OUT
6
tc268
Figure 2. AAT4687-1 Pinout – 10-Pin, 2.2 mm  2.0 mm SC70JW
(Top View)
Table 1. AAT4687-1 Signal Descriptions
Pin Number
Name
Description
1
N/C
No connect.
2, 8, 9, 10
GND
Ground connection pin.
FLT
Over-voltage or over-temperature fault reporting output pin. Open drain. FLT goes low when input voltage exceeds the
over-voltage threshold or an over-temperature fault occurs. An external pull-up resistor to VIO (6.5 V max) should be added.
EN
Enable input pin, active low. An internal pull-down resistor is connected on this pin. Connect to ground for normal
operation. Connect to high (6.5 V Max) to shut down the device, which then draws less than 1 A of current.
5
IN
Power input pin. Connect 1 F capacitor from IN to GND.
6, 7
OUT
3
4
Output. Connect a 0.1 F ~ 47 F capacitor from OUT to GND.
Electrical and Mechanical Specifications
Typical performance characteristics of the AAT4687-1 are shown
in Figures 3 through 19.
The absolute maximum ratings of the AAT4687-1 are provided in
Table 2, the thermal information is listed in Table 3, and electrical
specifications are provided in Table 4.
Table 2. AAT4687-1 Absolute Maximum Ratings (Note 1)
Minimum
Maximum
Units
IN to GND
Parameter
VIN
0.3
+30
V
OVP to GND
VOVP
0.3
+6.5
V
FLT, EN to GND
VFLT, VEN
0.3
+6.5
V
OUT to GND
VOUT
0.3
VIN + 0.3
V
Maximum continuous switch current
IMAX
1.8
A
Operating junction temperature range
TJ
40
150
ºC
Storage temperature
TSTG
40
150
ºC
Maximum soldering temperature (at leads)
TLEAD
300
ºC
Note 1:
Symbol
Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Table 3. AAT4687-1 Thermal Information
Parameter
Symbol
Value
Units
Maximum thermal resistance (Note 1)
JA
160
ºC/W
Maximum power dissipation (Note 1, Note 2)
PD
625
mW
Note 1:
Mounted on an FR4 board.
Note 2:
Derate 6.25 mW/°C above 25 °C.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
Table 4. AAT4687-1 Electrical Specifications (Note 1)
(VIN = 5 V, TA = –40 C to +85C, Unless Otherwise Noted, Typical Values are TA = +25 C)
Parameter
Input over-voltage protection range
Symbol
Test Condition
Min
Typical
VIN_MAX
Normal operating input voltage range
VIN
Operation quiescent current
IQ
VIN = 5 V, EN = 0 V, IOUT = 0 A
Shutdown supply current
ISD(OFF)
EN = VIN, VIN = 5.5 V, VOUT = 0 V
Under-voltage lockout threshold
VUVLO
Rising edge
Under-voltage lockout threshold hysteresis
VUVLO_HYS
Over-voltage lockout threshold, IN pin
VOVPT
Over-voltage lockout threshold hysteresis,
IN pin
VOVP_HYS
Max
Units
28
V
VOVP
2.2
_MIN
35
60
A
1
A
2.0
2.2
V
0.1
Rising edge
5.7
V
5.9
V
6
0.15
V
V
MOSFET Switch
PMOS On-resistance
RDS(ON)
IOUT = 1500 mA (Note 2), TA = +25 °C
Switch Off-leakage
ID(OFF)
EN = VIN
120
140
m
1
A
Logic
EN input low voltage
VEN(L)
EN input high voltage
VEN(H)
0.4
EN input leakage
IEN
VEN = 5.5 V or 0 V
FLT output voltage low
FLTOL
IFLT = 1 mA
FLT output leakage current
FLTIOL
1.6
V
V
0.5
2.0
A
0.4
V
1
A
15
ms
Timing
FLT blanking time
tBLK_FLT
From de-assertion of O V
5
10
FLT assertion delay time from over-voltage
(OV)
tD_FLT
From assertion of O V
Over-voltage release time
tRLS_OV
VIN fall from (6 V + TBD) to (VOVP_MIN  TBD)
Over-voltage response time
tRESP_OV
VIN rise from (VOVP_MIN  TBD) to (6 V + TBD)
0.7
s
Turn-on delay time
tON
VIN = 5V; ROUT = 10 ; COUT = 1 F
10
ms
Turn-on rise time
tR
VIN = 5V; ROUT = 10 ; COUT = 1 F
1
ms
Turn-off delay time
tOFF
VIN = 5V; ROUT = 10 ; COUT = 1 F
9
ms
Turn-off fall time
tF
VIN = 5V; ROUT = 10 ; COUT = 1 F
4.5
ms
s
1
5
10
15
ms
Thermal Protection
Shutdown temperature
TSHDN
150
°C
Over-temperature shutdown hysteresis
THYS
20
°C
Note 1:
Performance is guaranteed only under the conditions listed in this table.
Note 2:
Pulse test: pulse width = 300 s
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201963B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 2, 2014
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
Typical Performance Characteristics
(VIN = 5 V, TA = –40 C to +85C, Unless Otherwise Noted, Typical Values are TA = +25 C)
60
55
50
45
40
35
30
25
2
2.5
3
3.5
4
4.5
5
5.5
42
39
36
33
tc270
65
Operation Quiescent Currnet (μA)
45
70
tc269
Operation Quiescent Currnet (μA)
75
30
-40
6
-15
10
60
85
Temperature (°C)
Supply Voltage (V)
Figure 4. Operation Quiescent Current vs Temperature
Figure 3. Operation Quiescent Current vs Supply Voltage
0.8
30
0.7
Switch Off Currnet (μA)
25
20
15
10
5
0.6
0.5
0.4
0.3
0.2
0
0
4
8
12
16
20
24
tc272
0.1
tc271
Shutdown Supply Current (μA)
35
0
2
28
2.5
3
3.5
4
4.5
5
5.5
6
Supply Voltage (V)
Supply Voltage (V)
Figure 6. Switch Off Leakage vs Supply Voltage
Figure 5. Shutdown Supply Current vs Supply Voltage
OVP
1 V/div
160
120
VOUT
2 V/div
100
IOUT
500 mAV/div
60
-40
-15
10
35
60
Temperature (°C)
Figure 7. PMOS On-Resistance vs Temperature
(VIN = 5 V, ILOAD = 1.5 A)
FLT
5 V/div
tc274
80
tc273
On-Resistance (mΩ)
140
85
2 ms/div
Figure 8. FLT Blanking Time (VIN = 5 V)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
2.5
12
UVLO_High
UVLO Threshold (V)
2.3
10
9
UVLO_Low
2.1
1.9
8
-40
-15
10
35
60
1.5
-40
85
tc276
tc275
1.7
-15
35
6
750
5.9
OVP Threshold (V)
800
700
650
5.8
5.7
5.6
600
10
35
60
OVP_High
OVP_Low
tc277
-15
85
Figure 10. Under-Voltage Lockout Threshold vs Temperature
Figure 9. FLT Blanking Time vs Temperature
550
-40
60
Temperature (°°C)
Temperature (°C)
tRESP_OV (ns)
10
5.5
-40
85
-15
10
35
60
tc278
tBLK_FLT (ms)
11
85
Temperature (°°C)
Temperature (°C)
Figure 12. Over-Voltage Lockout Threshold vs Temperature
Figure 11. Over-Voltage Response Time vs Temperature
11
1.4
1.3
10
tRLS_OV (ms)
1.1
1
9
8
0.9
–40 ºC
25 ºC
85 ºC
7
0.7
2
2.5
3
3.5
4
4.5
5
5.5
Supply Voltage (V)
Figure 13. EN Input High Voltage vs Supply Voltage
6
6
-40
tc280
0.8
tc279
VEN(H) (V)
1.2
-15
10
35
60
85
Temperature (°°C)
Figure 14. Over-Voltage Release Time vs Temperature
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
1.4
1.3
VOUT
(2 V/div)
1.1
1
0V
EN
(2 V/div)
0.9
0V
–40 ºC
25 ºC
85 ºC
0.7
0.6
2
2.5
3
3.5
4
4.5
5
5.5
tc282
0.8
tc281
VEN(L) (V)
1.2
6
2 ms/div
Supply Voltage (V)
Figure 16. Turn On Delay Time (VIN = 5 V, ROUT = 10 )
Figure 15. EN Input Low Voltage vs Supply Voltage
VIN
(1 V/div)
5V
VOUT
(2 V/div)
VOUT
(2 V/div)
EN
(2 V/div)
tc283
tc284
FLT
(5 V/div)
0V
Time (5 μs/div)
2 ms/div
Figure 17. Turn Off Delay Time (VIN = 5 V, ROUT = 10 )
Figure 18. Over-Voltage Protection Response
VIN
(1 V/div)
VOUT
(2 V/div)
0.7 μs
tc285
FLT
(5 V/div)
300 ns/div
Figure 19. Over-Voltage Response Time
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
Metal Programmable
IN
OUT
FLT
OVP
Sense
and
Control
EN
GND
tc286
Figure 20. AAT4687-1 Functional Block Diagram
Functional Description
The AAT4687-1 provides up to 5.9 V over-voltage protection
when powering low-voltage systems such as cell phones, MP3
players, and PDAs or when charging Lithium-Ion batteries from
a poorly regulated supply. The AAT4687-1 is inserted between
the power supply or charger source and the load to be
protected. The AAT4687-1 IC includes a low resistance
P-channel MOSFET, under-voltage lockout protection, overvoltage monitor, fast shutdown circuitry, and a fault output flag.
In normal operation, the P-channel MOSFET acts as a slew-rate
controlled load switch, connecting and disconnecting the power
supply from IN to OUT. A low resistance MOSFET is used to
minimize the voltage drop between the voltage source and the
load and to reduce power dissipation. When the voltage on the
input exceeds the over-voltage protection trip voltage (set
internally), the device immediately turns off the internal
P-channel FET, disconnecting the load from the input and
preventing damage to downstream components.
Simultaneously, the fault flag is raised, alerting the system to a
problem.
If an over-voltage condition is applied at the time of the device
enable, the switch remains OFF.
A functional block diagram is shown in Figure 20. Figure 21
shows the timing diagram.
Under-Voltage Lockout (UVLO)
The AAT4687-1 has a fixed 2.0 V under-voltage lockout level
(UVLO). When the input voltage is less than the UVLO level, the
MOSFET is turned off. Hysteresis of 100 mV is included to
ensure circuit stability.
Over-Voltage Protection (OVP)
The AAT4687-1 has a resistor divider that is internally
integrated with the input voltage trip point at 5.9 V. Once the
over-voltage trip level is triggered, the PMOS switch controller
turns off the PMOS in less than 0.7 s.
Over-Temperature Protection (OTP)
If the ambient temperature of the device exceeds TSHDN, the
OVP switch is turned off, and the pin is driven low. The OVP
switch recovers automatically when the junction temperature
falls below TSHDN – 20 °C.
Fault Indicator (FLT)
The output is an active-low open-drain fault reporting output. A
pull-up resistor should be connected from FLT to the logic I/O
voltage of the host system. FLT is asserted immediately if an
over-voltage or over-temperature fault occurs.
Enable Control (EN)
EN is an active-low enable input. EN is driven low, connected to
ground, or left floating for normal device operation. Taking EN
high turns off the MOSFET. In the event of an over-voltage or
UVLO condition, toggling EN does not override the fault
condition, and the switch remains off.
Device Operation
On initial power-up, if VIN < VUVLO or if VOVP > VOVP_TH (5.9 V),
the PMOS is held off. If VUVLO < VIN, VOVP < VOVP_TH, and EN is
low, the device enters startup after a 10 ms internal delay.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201963B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 2, 2014
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
VOVPT
VOVPT
IN
tD_FLT
tBLK_FLT
FLT
tRESP_OV
tRLS_OV
OUT
50%
EN
tOFF
tON
90%
50%
10%
OUT
90%
50%
10%
tF
tR
tc244
Figure 21. AAT4687-1 Timing Diagram
Application Information
The AAT4687-1 over-voltage protection circuit provides fast
protection against transient voltage spikes and short duration
spikes of high voltage from the power supply lines. The
AAT4687-1 can quickly disconnect the input supply from the
load and avoid damage to sensitive components.
spike can occur that can damage other electronic components
(such as the battery charger ) in the product. A "hot plug" of the
AC/DC wall adapter into the AC outlet can create and release a
voltage spike from the transformer. As a result, some sensitive
components within the product can be damaged. With the
AAT4687-1 placed between the power lines and the sensitive
devices, they are insulated from the voltage spike and the input
supply is disconnected in 0.7 s.
In portable product applications, removing the battery pack
during charging can create large transients, and a high voltage
Figure 22 shows the over-voltage protection response time test
circuit.
Over-Voltage Protection
SCOPE
+12 V
LOAD
AAT4687-1
VIN
+5 V
1
2
3
4
8
7
6
5
GND
10
VOUT
GND
Fault
tc287
Figure 22. Over-Voltage Protection Response Time Test Circuit
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
Input Capacitor
A 1 F or larger capacitor is typically recommended for CIN. CIN
should be located as close to the device VIN pin as practically
possible. Ceramic, tantalum, or aluminum electrolytic
capacitors may be selected for CIN. There is no specific
capacitor equivalent series resistance (ESR) requirement for CIN.
However, for higher current operation, ceramic capacitors are
recommended for CIN due to their inherent capability over
tantalum capacitors to withstand input current surges from low
impedance sources such as batteries in portable devices.
Capacitors are typically manufactured in different voltage
ratings. If the maximum possible surge voltage is known, select
capacitors with a voltage rating at least 5 V higher than the
maximum possible surge voltage. Otherwise, 50 V rated
capacitors are generally good for most OVP applications to
prevent any surge voltage.
°C. Typical conditions are calculated under normal ambient
conditions where TA = +25 °C. At TA = +85 °C, PD(MAX)=
250 mW. At TA = +25 °C, PD(MAX) = 625 mW.
The maximum continuous output current for the AAT4687-1 is a
function of the package power dissipation and the RDS of the
MOSFET at TJ(MAX). The maximum RDS of the MOSFET at TJ(MAX)
is calculated by increasing the maximum room temperature.
For maximum current, refer to the following equation:
I OUT ( MAX ) 
PD( MAX )
RDS
The maximum allowable output current for the AAT4687-1 is
1.8 A. If the output current exceeds 1.8 A, the device is
damaged.
Printed Circuit Board Layout Recommendations
Output Capacitor
A 0.1 F  47 F output capacitor is required at the output.
Likewise, with the output capacitor, there is no specific
capacitor ESR requirement. COUT may be increased to
accommodate any load transient condition.
Thermal Considerations and Maximum Output Current
The AAT4687-1 delivers a continuous output load current. The
limiting characteristic for maximum safe operating output load
current is package power dissipation. In order to obtain high
operating currents, careful device layout and circuit operating
conditions must be taken into account. The following
description assumes the load switch is mounted on a printed
circuit board utilizing the minimum recommended footprint as
stated in the Printed Circuit Board Layout Recommendations
section. At any given ambient temperature (TA), the maximum
package power dissipation can be determined by the following
equation:
PD( MAX ) 
TJ ( MAX )  TA
 JA
Constants for the AAT4687-1 are maximum junction
temperature (TJ(MAX) = +125 °C) and package thermal
resistance (JA = 160 °C/W). Worst-case conditions are
calculated at the maximum operating temperature, TA = +85
For proper thermal management and to take advantage of the
low RDS(ON) of the AAT4687-1, certain circuit board layout rules
should be followed:
 VIN and VOUT should be routed using wider than normal traces,
and GND should be connected to a ground plane.
 To maximize package thermal dissipation and power handling
capacity of the AAT4687-1 SC70JW-10 package, the
ground plane area connected to the ground pins should be
as large as possible.
 For best performance, CIN and COUT should be placed close to
the package pins.
Evaluation Board Description
The AAT4687-1 Evaluation Board is used to test the
performance of the AAT4687-1. An Evaluation Board schematic
diagram is provided in Figure 23. Layer details for the
Evaluation Board are shown in Figure 24. The Evaluation Board
has additional components for easy evaluation; the bill of
materials required for the system is shown in Table 5.
Package Information
Package dimensions for the 10-pin SC70JW package are shown
in Figure 25. Tape and reel dimensions are shown in Figure 26.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
201963B • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • June 2, 2014
9
DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
+5 V
DS1
Red LED
VIN
VOUT
U1
AAT4687-1
5
8
9
10
1
C1
1 μF
IN
GND
GND
GND
NC
FLT
OUT
OUT
EN
GND
3
7
6
4
2
R3
1.5 kΩ
C2
1 μF
C3
JP1
Enable
tc288
Figure 23. AAT4687-1 Evaluation Board Schematic
Table 5. AAT4687-1 Evaluation Board Bill of Materials
Component
U1
Part number
AAT4687-1
R1
Description
Manufacturer
Over-voltage protection switch
Skyworks
Not populated
R2
Not populated
R3
RC0603FR-071K5L
Resistor 1.5 k 1/10 W 1% 0603 SMD
Yageo
C1
GRM31MR71H105K
Ceramic capacitor 1 F 1206 X7R 50 V 10%
Murata
C2
GRM21BR71C105K
Ceramic capacitor 1 F 0805 X7R 16 V 10%
Murata
C3
D1
Not populated
0805KRCT
Red LED 0805
(a) Component Side Layout
HB
(b) Solder Side Layout
Figure 24. AAT4687-1 Evaluation Board Layer Details
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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tc289
DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
2.20 ± 0.20
1.75 ± 0.10
0.40 BSC
Pin 1
Location
0.225 ± 0.075
Top View
0.45 ± 0.10
0.100
4º ± 4º
0.05 ± 0.05
0.15 ± 0.05
1.10 MAX
0.85 ± 0.15
2.00 ± 0.20
2.10 ± 0.30
7º ± 3º
Side View
End View
tc37
All dimensions in millimeters.
Figure 25 AAT4687-1 10-pin SC70JW Package Dimensions
4.00 ± 0.10
1.75 ± 0.05
1.30 ± 0.10
2.00 ± 0.05
1.55 ± 0.05
8.00 ± 0.30
3.50 ± 0.05
2.50 ± 0.10
Pin 1 Location
2.40 ± 0.10
0.20 ± 0.03
4.00 ± 0.10
All dimensions are in millimeters.
tc38
Figure 26. AAT4687-1 10-pin SC70JW Tape and Reel Dimensions
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • [email protected] • www.skyworksinc.com
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DATA SHEET • AAT4687-1: OVER-VOLTAGE PROTECTION SWITCH
Ordering Information
Model Name
AAT4687-1 over-voltage protection switch
Part Marking (Note 1)
U2XYY
Manufacturing Part Number (Note 2)
AAT4687-1IJQ -T1
Evaluation Board Part Number
AAT4687-1IJQ-EVB
Note 1: XYY = assembly and date code.
Note 2: Sample stock is generally held on part numbers listed in BOLD.
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June 2, 2014 • Skyworks Proprietary and Confidential Information • Products and Product Information are Subject to Change Without Notice • 201963B