AAT4684ITP-6.5-T1 [ANALOGICTECH]
Over-Voltage Protection Switch; 过电压保护器开关
| 型号： | AAT4684ITP-6.5-T1 |
| 厂家： | 
ADVANCED ANALOGIC TECHNOLOGIES |
| 描述： | Over-Voltage Protection Switch |
| 文件： | 总13页 (文件大小：286K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
General Description
Features
The AAT4684 OVPSwitch™ is a member of AnalogicTech’s
Application Specific Power MOSFET™ (ASPM™) product
family. It is a P-channel MOSFET power switch with pre-
cise over-voltage protection control, designed to protect
low-voltage systems against high-voltage faults up to
+28V. If the input voltage exceeds the programmed
over-voltage threshold, the P-channel MOSFET switch
will be turned off to prevent damage to the output load
circuits. The AAT4684 is available with an internally pro-
grammed over-voltage trip point or as an adjustable
version programmed by two external resistors.
• Over-Voltage Protection Up to +28V
• Fixed or Adjustable Over-Voltage Protection Threshold
• 3V Under-Voltage Lockout Threshold
• Fast OVP Response:
▪ 1μs (Max) to Over-Voltage Transient
• Low Operation Quiescent Current
▪ 30μA Typical
▪ 1μA Max in Shutdown (Disabled)
• 100mΩ Typical (130mΩ max) RDS(ON) at 4.5V
• 1.8A Maximum Continuous Current
• Temperature Range: -40°C to 85°C
• Available in TSOPJW-12 Package
The AAT4684 also includes an under-voltage lockout
(UVLO) protection circuit, which will put the device into
sleep mode at low input voltages only consuming < 1μA
of current.
Applications
• Cell Phones
The AAT4684 is offered in a small Pb-free, 12-pin
TSOPJW package and is specified for operation over the
-40°C to +85°C ambient temperature range.
• Digital Still Cameras
• GPS
• MP3 Players
• Personal Data Assistants (PDAs)
• USB Hot Swap/Live Insertion Device
Typical Application (Adjustable Version)
VIO +5V
VIN 3V – 28V
IN
Fault Flag
FLT
AAT4684
OVP
OUT
VOUT
1μF
EN
GND
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PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Pin Descriptions
Pin #
Fixed
Adj.
Symbol Function
1, 2, 9, 11, 12
1, 2, 9, 12
N/C
Not connected.
Over-voltage fault reporting output pin. FLT goes low when input voltage exceeds
the over-voltage threshold. An external pull up resistor to VIO (6.5V max) should be
added.
Enable pin, active low. An internal pull-down resistor is connected on this pin. Con-
nect to Ground for normal operation. Connect to high (6.5V max) to shut down the
device when it draws less than 1μA of current.
3
4
3
4
FLT
EN
5, 6
7, 8
10
5, 6
7, 8
10
OUT
IN
GND
OVP
Output pin. Connect a 0.1μF~47μF capacitor from OUT to GND.
Power input pin. Connect 1μF capacitor from IN to GND.
Ground connection pin.
n/a
11
Over-voltage protection threshold input pin (Adjustable version only).
Pin Configuration
TSOPJW-12
Fixed Version
(Top View)
TSOPJW-12
Adjustable Version
(Top View)
1
2
3
4
5
6
12
11
10
9
1
2
3
4
5
6
12
11
10
9
N/C
N/C
FLT
EN
N/C
N/C
GND
N/C
IN
N/C
N/C
FLT
EN
N/C
OVP
GND
N/C
IN
8
8
OUT
OUT
OUT
OUT
7
7
IN
IN
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4684.2007.11.1.1
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VIN
VOVP
VFLT, VEN
VOUT
IMAX
IN to GND
OVP to GND
FLT, EN to GND
OUT to GND
Maximum Continuous Switch Current
Operating Junction Temperature Range
-0.3 to 30
-0.3 to 6.5
-0.3 to 6.5
VIN + 0.3
1.8
V
V
V
V
A
TJ
-40 to 150
°C
Thermal Characteristics
Symbol
Description
Maximum Thermal Resistance2
Maximum Power Dissipation2, 3
Value
Units
θJA
PD
160
625
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions
specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Mounted on a FR4 board.
3. Derate 6.25mW/°C above 25°C.
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PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Electrical Characteristics1
VIN = 5V, TA = -40°C to 85°C unless otherwise noted. Typical values are at TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
VIN
Normal Operation Voltage Range
3.0
14
V
IQ
Operation Quiescent Current
VIN = 5V, EN = 0V, IOUT = 0
30
50
μA
ISD(OFF)
VUVLO
VUVLO_HYS
Adjustable
VOVP_TH
VOVP_HYS
Fixed
VIN_OVP_TH
Shutdown Supply Current
Under-Voltage Lockout Threshold
Under-Voltage Lockout Hysteresis
EN = IN, VIN = 5.5V, VOUT = 0
Rising Edge
1
3.3
μA
V
V
3.0
0.1
Over-Voltage Lockout Threshold, OVP Pin
Over-Voltage Lockout Threshold Hysteresis, OVP Pin
Rising Edge
Rising Edge
1.084
1.1
20
1.117
V
mV
Input Over-Voltage Lockout Threshold, IN Pin
6.5
V
Input Over-Voltage Lockout Threshold Hysteresis,
IN Pin
VIN_OVP_HYS
120
mV
MOSFET Switch
RDS(ON) PMOS On-Resistance
ID(OFF)
Logic
IOUT = 1800mA, TA = 25°C
EN = VIN
100
0.5
130
1
mΩ
μA
Switch Off-Leakage
VEN(L)
VEN(H)
IEN
EN Input Low Voltage
EN Input High Voltage
EN Input Leakage
0.4
V
V
μA
V
μA
ms
μs
1.6
5
VEN = 5.5V or 0V
IFLT = 1mA
2.0
0.4
1
FLTOL
FLTIOL
TBLK_FLT
TD_FLT
FLT Output Voltage Low
FLT Output Leakage Current
FLT Blanking Time
From De-assertion of OV
From Assertion of OV
10
1
15
FLT Assertion Delay Time from Over-Voltage (OV)
VIN = 5V, VOVP Rise to 1.13V
from 1.07V in 1ns
TRESP_OV
Over-Voltage Response Time
0.7
μs
TON
TR
TOFF
TF
Turn On Delay Time
Turn On RiseTime
Turn Off Delay Time
Turn Off Fall Time
VIN = 5V; RO = 10Ω; CO = 1μF
VIN = 5V; RO = 10Ω; CO = 1μF
VIN = 5V; RO = 10Ω; CO = 1μF
VIN = 5V; RO = 10Ω; CO = 1μF
10
1
6
ms
ms
ms
μs
20
1. The AAT4684 is guaranteed to meet performance specifications over the -40 to 85°C operating temperature range and is assured by design, characterization and correlation
with statistical process controls.
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4684.2007.11.1.1
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Typical Characteristics
Operation Quiescent Current
vs. Supply Voltage
Operation Quiescent Current
vs. Temperature
50
45
40
35
30
25
20
15
10
5
40
35
30
25
20
15
0
3
4
5
6
7
8
9
10
11
12
13
14
-40
-15
10
35
60
85
85
85
Supply Voltage (V)
Temperature (°C)
Shutdown Supply Current
vs. Supply Voltage
Shutdown Supply Current
vs. Temperature
3.0
2.4
1.8
1.2
0.6
0.0
0.35
0.28
0.21
0.14
0.07
0.00
2
4
6
8
10 12 14 16 18 20 22 24 26 28
-40
-15
10
35
60
Supply Voltage (V)
Temperature (°C)
Switch Off Leakage Current vs. Supply Voltage
PMOS On-Resistance vs. Temperature
160
140
120
100
80
0.014
0.012
0.010
0.008
0.006
0.004
0.002
0.000
60
-40
-15
10
35
60
2
4
6
8
10 12 14 16 18 20 22 24 26 28
Supply Voltage (V)
Temperature (°C)
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PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Typical Characteristics
FLT Blanking Time vs. Temperature
FLT Blanking Time
(VIN = 5.0V)
12
11
10
9
5.0V
VOUT
(1V/div)
4.3V
FLT
(2V/div)
0V
8
1.15V
OVP
(100mV/div)
7
-40
-15
10
35
60
85
Temperature (°C)
Time (2ms/div)
Undervoltage Lockout Threshold vs. Temperature
Over-Voltage Response Time vs. Temperature
800
750
700
650
600
550
4.00
3.50
VIN Rising
3.00
VIN Falling
2.50
2.00
1.50
-40
-15
10
35
60
85
-40
-15
10
35
60
85
Temperature (°C)
Temperature (°C)
Over-Voltage Lockout Threshold
(Adjustable Version) vs. Temperature
1.12
1.11
1.10
1.09
1.08
1.07
1.06
VOVP_TH
VOVP_HYS
-40
-15
10
35
60
85
Temperature (°C)
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4684.2007.11.1.1
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Typical Characteristics
EN Input High Voltage vs. Supply Voltage
EN Input Low Voltage vs. Supply Voltage
1.1
1.1
1.0
0.9
0.8
0.7
0.6
-40°C
25°C
-40°C
1.0
0.9
0.8
0.7
0.6
25°C
85°C
85°C
3
4
5
6
7
8
9
10
11
12
13
14
3
4
5
6
7
8
9
10
11
12
13
14
Supply Voltage (V)
Supply Voltage (V)
Turn Off Delay Time
(VIN = 5.0V, RO = 10Ω)
Turn On Delay Time
(VIN = 5.0V, RO = 10Ω)
VOUT
(2V/div)
4.84V
VOUT
(2V/div)
0V
EN
(2V/div)
0V
EN
(2V/div)
0V
Time (2ms/div)
Time (2ms/div)
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PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Functional Block Diagram
Fixed Option
IN
OUT
OVP Sense
and Control
OVP
FLT
GND
EN
exceeds the over-voltage protection trip voltage (inter-
nally set or externally by a voltage divider to the OVP
pin), the device immediately turns off the internal
P-channel FET, disconnecting the load from the abnormal
input and preventing damage to any downstream com-
ponents. Simultaneously, the fault flag is raised alerting
the system to a problem.
Functional Description
The AAT4684 provides up to 28V over-voltage protection
when powering low-voltage systems such as cell phones,
MP3, and PDAs or when charging Lithium-Ion batteries
from a badly regulated supply. The AAT4684 is inserted
between the power supply or charger source and the
load to be protected. The AAT4684 IC consists of a low
resistance P channel MOSFET, under-voltage lockout pro-
tection, over-voltage monitor, fast shut-down circuitry
and a fault output flag.
If an over-voltage condition is applied at the time of the
device enable, then the switch will remain OFF.
Under-Voltage Lockout (UVLO)
In normal operation the P channel MOSFET acts as a
slew-rate controlled load switch, connecting and discon-
necting the power supply from IN to OUT. A low resis-
tance MOSFET is used as to minimize the voltage drop
between the voltage source and the load and to reduce
the power dissipation. When the voltage on the input
The AAT4684 has a fixed 3.0V under-voltage lockout
level (UVLO). When the input voltage is less than the
UVLO level, the MOSFET is turned off. 100mV of hyster-
esis is included to ensure circuit stability.
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4684.2007.11.1.1
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Over-Voltage Protection
Application Information
The AAT4684 adjustable version has a 1.1V ±1.5% over-
voltage trip threshold on the OVP pin. With a resistor
divider on OVP pin from IN to GND, the over-voltage trip
point can be adjusted anywhere within the input voltage
range (see Table 1). Once the over-voltage trip level is
triggered, the PMOS switch controller will shut off the
PMOS in less than 1μs.
Over-Voltage Protection
The AAT4684 over-voltage protection circuit provides
fast protection against transient voltage spikes and short
duration spikes of high voltage from the power supply
lines. AAT4684 can quickly disconnect the input supply
from the load and not cause any damage to sensitive
components
The AAT4684 fixed version is also available where the
resistor divider is internally integrated with the input
voltage trip point at 6.5V. The fixed version of AAT4684
does not have a connection to the internal OVP circuitry
and the pin #11 is designed to be not connected.
In portable product applications, if the user removes the
battery pack during charging, this action can create
large transients and a high voltage spike can occur
which can damage other electronic devices in the prod-
uct such as the battery charger. 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 devices within the product can be damaged.
With the AAT4684 placed between the power lines and
the sensitive devices, the voltage spike can be kept
away and the input supply disconnected from other
devices in 0.7μs.
FLT Output
The FLT output is an active-low open-drain fault (OV)
reporting output. A pull-up resistor should be connected
from FLT to the logic I/O voltage of the host system. FLT
will be asserted immediately if an over-voltage fault
occurs (only about a 1μs inherited internal circuit delay).
A 10ms blanking is applied to FLT signal prior to de-
assertion.
Figure 2 shows the response time of over-voltage pro-
tection from the test circuit (Figure 1). The input volt-
age is rapidly increased from 5V to 12V by a voltage
surge or voltage spike. The voltage at the OVP pin is also
increased until the trip point is triggered. At this point,
the FLT pin is pulled low and the output voltage starts to
fall. Figure 3 shows a zoom-in scope capture of the OVP
response time; the output is disconnected from the input
in as little as 700ns.
EN Input
EN is an active-low enable input. EN is driven low, con-
nected to ground, or left floating for normal device
operation. Taking the EN high turns off the MOSFET. In
the case of an over-voltage or UVLO condition toggling
the EN will not override the fault condition and the
switch will remain off.
Adjustable Version - Over-Voltage
Protection Resistors
Device Operation
On initial power-up, if VIN < UVLO or if VOVP > VOVP_TH
The over-voltage protection threshold is programmed
with two resistors, R1 and R2. To limit the current going
through the external resistor string while maintaining
good noise immunity, use smaller resistor values, such
as 10KΩ for R2. Using a larger value will further reduce
the system current, but will also increase the impedance
of the OVP node, making it more sensitive to external
noise and interference. A suggested value for R2 is
110KΩ. Table 1 summarizes resistor values for various
over-voltage settings. Use 1% tolerance metal film
resistors for programming the desired OVP setting.
(1.1V), the PMOS is held off. If UVLO < VIN, VOVP
OVP_TH, and EN is low, the device enters startup after a
10ms internal delay.
<
V
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PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
R2 (KΩ)
R1 (KΩ)
VOVP Setting (V)
110
110
110
110
110
110
110
110
110
110
487
536
787
1050
1300
1540
1780
2050
2320
2550
6.0
6.5
9.0
11.5
14.0
16.5
19.0
21.5
24.0
26.5
Table 1: Recommended OVP Setting for AAT4684 Adjustable Version1.
SCOPE
+12V
LOAD
AAT4684
10Ω
gnd
1
8
2
7
Vin
Vout
Fault
3
4
6
5
GND
+5V
OVP
Figure 1: Over-Voltage Protection Response Time Test Circuit.
12V
1.23V
VIN
(5V/div)
OVP
(200mV/div)
1.03V
Output Load = 10Ω
No COUT
Output Load = 10Ω
COUT = 1µF
0.7µs
OVP
(50mV/div)
5V
OVP Trip Point (1.1V)
VOUT
(100mV/div)
VOUT
(5V/div)
FLT
(2V/div)
FLT
(2V/div)
Time (200µs/div)
Time (500ns/div)
Figure 2: Typical Over-Voltage Response Time.
Figure 3: Typical Over-Voltage Response Time
[zoom in].
1. Mimimum OVP voltage setting = 5V.
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4684.2007.11.1.1
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
will assume the load switch is mounted on a printed cir-
cuit board utilizing the minimum recommended footprint
as stated in the “Printed Circuit Board Layout
Recommendations” section of this datasheet. At any
given ambient temperature (TA), the maximum package
power dissipation can be determined by the following
equation:
Input Capacitor
A 1μF 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 opera-
tion, 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.
TJ(MAX) -TA
PD(MAX)
=
θJA
Constants for the AAT4684 are maximum junction tem-
perature (TJ(MAX) = 125°C) and package thermal resis-
tance (θJA = 160°C/W). Worst-case conditions are calcu-
lated at the maximum operating temperature, TA =
85°C. Typical conditions are calculated under normal
ambient conditions where TA = 25°C. At TA = 85°C,
PD(MAX) = 250mW. At TA = 25°C, PD(MAX) = 625mW.
Capacitors are typically manufactured in different volt-
age ratings. 16V, 25V, and 50V are good for OVP applica-
tions. If the maximum possible surge voltage is known,
select capacitors with a voltage rating at least 5V higher
than the maximum possible surge voltage. Otherwise,
50V rated capacitors are generally good for most OVP
applications to prevent any surge voltage.
The maximum continuous output current for the AAT4684
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 maxi-
mum room temperature.
Output Capacitor
In order to insure stability while current limit is active, a
small output capacitance of approximately 1μF is
required at the output. Likewise, with the output capac-
itor, there is no specific capacitor ESR requirement. If
desired, COUT may be increased to accommodate any
load transient condition.
For maximum current, refer to the following equation:
PD(MAX)
RDS
=
IOUT(MAX)
FAULT Flag
A FAULT flag is provided to alert the system if the
AAT4684’s input voltage has passed the pre-programmed
over-voltage trip point. Since the FAULT is open drain
pin, it should be pulled up to input/output voltage rail
and less than the maximum operating voltage of 6.5V.
Printed Circuit Board Layout
Recommendations
For proper thermal management and to take advantage
of the low RDS(ON) of the AAT4684, 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
AAT4684 TSOPJW-12 package, the ground plane area
connected to the ground pins should be made as large
as possible. For best performance, CIN and COUT should
be placed close to the package pins. Refer to Figures 3
and 4.
Thermal Considerations and
High Output Current Applications
The AAT4684 is designed to deliver a continuous output
load current. The limiting characteristic for maximum
safe operating output load current is package power dis-
sipation. In order to obtain high operating currents,
careful device layout and circuit operating conditions
must be taken into account. The following discussions
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PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Evaluation Board Schematic
+5V
DS1
Red LED
U1
8
TSOPJW-12
R3
3
12
5
6
4
IN
FLT
N/C
VIN
7
1
1.5K
IN
R1
N/C
N/C
OVP
N/C
OUT
OUT
EN
VOUT
2
C1
1μF
C2
1μF
11
9
10
GND
R2
110k
AAT4684
JP1
Enable
Adjustable version
Input Cap, C1
R1 (kΩ) VOVP_SETTING (V)
C1 1206 X7R 1uF 50V GRM31MR71H105KA88
(C1 1206 X7R 2.2uF 50V GRM31CR71H225KA88L)
(C1 1210 X7R 4.7uF 50V GRM32ER71H475KA88L)
487
6.0
6.5
9.0
536
787
Output Cap, C2
1050
1300
1780
2320
11.5
14.0
19.0
24.0
for under 13V application, C2 0805 X7R 1uF 16V GRM21BR71C105KA01
(for under 20V application, C2 0805 X7R 1uF 25V GRM219R71E105KA88)
For the fixed version, Open R1 and R2.
Figure 3: AAT4684 Evaluation Board Schematic.
Evaluation Board Layout
Figure 4: AAT4684 Evaluation Board
Component Side Layout.
Figure 5: AAT4684 Evaluation Board
Solder Side Layout.
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4684.2007.11.1.1
PRODUCT DATASHEET
AAT4684
OVPSwitchTM
Over-Voltage Protection Switch
Ordering Information
Package
OVP Trip Voltage
Marking
Part Number (Tape and Reel)
TSOPJW-12
TSOPJW-12
Adjustable
6.5V
YSXYY
AAT4684ITP-T1
AAT4684ITP-6.5-T1
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products that are in compliance with current RoHS standards, including the requirement that lead not
exceed 0.1% by weight in homogeneous materials. For more information, please visit our website at
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Package Information
TSOPJW-12
+ 0.10
- 0.05
0.20
0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC 0.50 BSC
7° NOM
0.04 REF
3.00 0.10
4° 4°
5
0.45 0.1
0.055 0.045
0.010
2.75 0.25
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
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conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fitness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to
support this warranty. Specific testing of all parameters of each device is not necessarily performed. AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other
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