FPF2142 [ONSEMI]
全功能负载开关,带逆向电流阻隔;型号: | FPF2142 |
厂家: | ONSEMI |
描述: | 全功能负载开关,带逆向电流阻隔 开关 驱动 接口集成电路 驱动器 |
文件: | 总14页 (文件大小:968K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
Is Now Part of
To learn more about ON Semiconductor, please visit our website at
www.onsemi.com
Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers
will need to change in order to meet ON Semiconductor’s system requirements. Since the ON Semiconductor
product management systems do not have the ability to manage part nomenclature that utilizes an underscore
(_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain
device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated
device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please
email any questions regarding the system integration to Fairchild_questions@onsemi.com.
ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number
of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right
to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON
Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON
Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer’s
technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA
Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended
or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out
of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor
is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner.
November 2008
FPF2140/42/43/44/46/47
tm
Full Function Load Switch with Reverse Current Blocking
Features
General Description
1.8 to 5.5V Input Voltage Range
Controlled Turn-On
The FPF2140/42/43/44/46/47 is a series of load switches which
provides full protection to systems and loads which may
encounter large current conditions. These devices contain a
0.12Ω current-limited P-channel MOSFET which can operate
over an input voltage range of 1.8-5.5V. Internally, current is
prevented from flowing when the MOSFET is off and the output
voltage is higher than the input voltage. Switch control is by a
logic input (ON) capable of interfacing directly with low voltage
control signals. Each part contains thermal shutdown protection
which shuts off the switch to prevent damage to the part when a
continuous over-current condition causes excessive heating.
200mA and 400mA Current Limit Options
Undervoltage Lockout
Thermal Shutdown
<2µA Shutdown Current
Auto Restart
Fast Current limit Response Time
5µs to Moderate Over Currents
30ns to Hard Shorts
When the switch current reaches the current limit, the part
operates in a constant-current mode to prohibit excessive
currents from causing damage. For the FPF2140/42/44/46, if
the constant current condition still persists after 30ms, the part
will shut off the switch and pull the fault signal pin (FLAGB) low.
The FPF2140/44 have an auto-restart feature which will turn the
switch on again after 450ms if the ON pin is still active. The
FPF2142/46 do not have this auto-restart feature so the switch
will remain off until the ON pin is cycled. For the FPF2143/47, a
current limit condition will immediately pull the fault signal pin
low and the part will remain in the constant-current mode until
the switch current falls below the current limit. The minimum
current limit is 200mA for the FPF2140/42/43 while that for the
FPF2144/46/47 is 400mA.
Fault Blanking
Reverse Current Blocking
Power Good Function
RoHS Compliant
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Hot Swap Supplies
These parts are available in a space-saving 6 pin 2X2 MLP
package.
Pin 1
TOP
BOTTOM
Ordering Information
Current Limit
Blanking Time
[ms]
Auto-Restart
Time
Current Limit
ON Pin
Activity
Part
[mA]
[ms]
FPF2140
FPF2142
FPF2143
FPF2144
FPF2146
FPF2147
200/300/400
200/300/400
200/300/400
400/600/800
400/600/800
400/600/800
15/30/60
15/30/60
0
225/450/900
Active HI
Active HI
Active HI
Active HI
Active HI
Active HI
NA
NA
15/30/60
15/30/60
0
225/450/900
NA
NA
©2008 Fairchild Semiconductor Corporation
FPF2140/42/43/44/46/47 Rev. I
1
www.fairchildsemi.com
Typical Application Circuit
TO LOAD
VIN
VOUT
FPF2140/2/3/4/6/7
FLAGB
PGOOD
ON
OFF ON
GND
Functional Block Diagram
VIN
UVLO
REVERSE
CURRENT
BLOCKING
CONTROL
LOGIC
ON
THERMAL
SHUTDOWN
CURRENT
LIMIT
VOUT
FLAGB
PGOOD
GND
2
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Pin Configuration
ON
6
1
PGOOD
7
GND
2
3
5
4
VIN
FLAGB
VOUT
2X2 MicroFET-6
Pin Description
Pin
Name
Function
Power Good output: Open drain output which indicate that output voltage has reached
90% of input voltage
1
PGOOD
2
3
VIN
Supply Input: Input to the power switch and the supply voltage For the IC
Switch Output: Output of the power switch
VOUT
Fault Output: Active LO, open drain output which indicates an over current supply under
voltage or over temperature state.
4
FLAGB
5, 7
6
GND
ON
Ground
ON Control Input
Absolute Maximum Ratings
Parameter
Min
Max
6
Unit
V
VIN, VOUT, ON, FLAGB, PGOOD to GND
Power Dissipation
-0.3
1.2
150
86
W
Operating and Storage Junction Temperature
Thermal Resistance, Junction to Ambient
-65
°C
°C/W
V
Jedec A114A
Jedec C101C
Jedec A115
HBM
4000
2000
400
CDM
V
Electrostatic Discharge Protection
MM
V
Air Discharge
Contact Discharge
15000
8000
V
IEC 61000-4-2
V
Recommended Operating Range
Parameter
Min
Max
5.5
Unit
VIN
1.8
-40
V
Ambient Operating Temperature, TA
85
°C
Electrical Characteristics
VIN =1.8to5.5V,TA =-40to+85°Cunlessotherwisenoted.TypicalvaluesareatVIN =3.3VandTA = 25°C.
Parameter
Symbol
Conditions
Min Typ Max Units
Basic Operation
Operating Voltage
VIN
1.8
40
5.5
V
V
IN = 1.8V
70
75
85
100
Quiescent Current
IQ
IOUT = 0mA
VIN = 3.3V
VIN = 5.5V
µA
120
3
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Electrical Characteristics Cont.
VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C.
Parameter
Symbol
Conditions
VIN = 3.3V, IOUT = 200mA, TA = 25°C
VIN = 3.3V, IOUT = 200mA, TA = 85°C
VIN = 3.3V, IOUT = 200mA, TA = -40°C to +85°C
VIN = 1.8V
Min Typ Max Units
120
135
160
180
180
On-Resistance
RON
mΩ
65
0.8
1.4
ON Input Logic High Voltage
(ON)
VIH
VIL
V
V
VIN = 5.5V
VIN = 1.8V
0.5
1
ON Input Logic Low Voltage
VIN = 5.5V
ON Input Leakage
VON = VIN or GND
-1
-2
1
µA
µA
V
V
ON = 0V, VIN = 5.5V,
OUT = short to GND
VIN Shutdown Current
2
V
IN = 5V, ISINK = 10mA
0.05
0.12
0.2
0.3
FLAGB Output Logic Low
Voltage
V
VIN = 1.8V, ISINK = 10mA
IN = VON = 5V
VIN = 5.5V
FLAGB Output High Leakage
Current
V
1
µA
%
PGOOD Threshold Voltage
90
1
PGOOD Threshold Voltage
Hysteresis
%
V
IN = 5V, ISINK = 10mA
0.05
0.12
0.1
0.2
V
V
PGOOD Output Logic Low
Voltage
VIN = 1.8V, ISINK = 10mA
PGOOD Output High Leakage
Current
V
IN = VON = 5V
1
µA
Reverse Block
V
V
ON = 0V, VOUT = 5.5V,
IN = short to GND
VOUT Shutdown Current
Protections
-2
2
µA
FPF2140, FPF2142,
FPF2143
200
400
300
600
400
800
VIN = 3.3V,
Current Limit
ILIM
mA
°C
V
OUT = 3.0V
FPF2144, FPF2146,
FPF2147
Shutdown Threshold TJ increasing
Return from Shutdown
Hysteresis
140
130
10
Thermal Shutdown
Under Voltage Lockout
VUVLO
VIN Increasing
1.55
1.65
1.75
V
Under Voltage Lockout
Hysteresis
50
mV
Dynamic
Delay On Time
tdON
tdOFF
tR
RL = 500Ω, CL = 0.1µF
25
45
µs
µs
µs
µs
Delay Off Time
RL = 500Ω, CL = 0.1µF
VOUT Rise Time
VOUT Fall Time
Over Current Blanking Time
Auto-Restart Time
RL = 500Ω, CL = 0.1µF
10
tF
RL = 500Ω, CL = 0.1µF
110
30
tBLANK
tRSTRT
FPF2140, FPF2142, FPF2144, FPF2146
FPF2140, FPF2144
15
60
ms
ms
225
450
900
VIN = VON = 3.3V. Moderate
Over-Current Condition
5
µs
ns
Short Circuit Response Time
V
IN = VON = 3.3V. Hard Short
30
Note 1: Package power dissipation on 1 square inch pad, 2 oz. copper board.
4
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Typical Characteristics
90
85
80
75
70
65
60
110
105
100
95
90
VIN = 5.5V
85
VIN = 3.3V
80
75
70
VIN = 1.8V
65
60
55
50
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
-40
-15
10
35
60
85
SUPPLY VOLTAGE (V)
TJ, JUNCTION TEMPERATURE (°C)
Figure 1. Quiescent Current vs. Input Voltage
Figure 2. Quiescent Current vs. Temperature
1.2
1.3
1.2
1.1
1
1.1
1
0.9
0.8
0.7
0.6
0.5
0.9
0.8
0.7
0.6
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Figure 3. VON High Voltage vs. Input Voltage
Figure 4. VON Low Voltage vs. Input Voltage
240
200
190
180
170
160
150
140
130
120
110
100
90
220
200
180
160
140
120
100
80
V = 1.8V
IN
V = 3.3V
IN
V = 5.5V
IN
80
60
1
2
3
4
5
6
-40
-15
10
35
60
85
V , SUPPLY VOLTAGE (V)
T , JUNCTION TEMPERATURE (°C)
IN
J
Figure 5. RON vs. VIN
Figure 6. RON vs. Temperature
5
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Typical Characteristics
700
600
500
400
300
200
100
0
350
300
250
200
150
100
50
FPF2144 / 46 / 47
IN = 5.5V
FPF2140 / 42 / 43
IN = 5.5V
V
V
0
0
1
2
3
4
5
6
0
1
2
3
4
5
6
VIN - VOUT (V)
VIN - VOUT (V)
Figure 7. Current Limit vs. Output Voltage
Figure 8. Current Limit vs. Output Voltage
320
635
FPF2140 / 42 / 43
FPF2144 / 46 / 47
630
625
620
615
610
605
600
595
590
585
580
575
315
310
305
300
295
290
-65
-40
-15
10
35
60
85
110
135
-65
-40
-15
10
35
60
85
110
135
TJ, JUNCTION TEMPERATURE (°C)
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. Current Limit vs. Temperature
Figure 10. Current Limit vs. Temperature
100
1000
VIN = 3.3 V
V = 3.3 V
IN
R = 500 Ohms
L
R = 500 Ohms
L
COUT = 0.1uF
T
F
tdOFF
100
10
1
tdON
TR
10
-40
-40
-15
10
35
60
85
-15
10
35
60
85
T , JUNCTION TEMPERATURE (°C)
T , JUNCTION TEMPERATURE (°C)
J
J
Figure 11. tdON / tdOFF vs. Temperature
Figure 12. TRISE / TFALL vs. Temperature
6
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Typical Characteristics
33
32.5
32
500
495
490
485
480
475
470
465
460
455
450
31.5
31
30.5
30
29.5
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (°C)
TJ, JUNCTION TEMPERATURE (°C)
Figure 13. TBLANK vs. Temperature
Figure 14. TRESTART vs. Temperature
C
C
IN = 10µF
OUT = 0.1µF
RL = 500Ω
IN = 3.3V
C
IN = 10µF
VON
2V/DIV
VON
2V/DIV
V
COUT = 0.1µF
RL = 500Ω
V
IN = 3.3V
IOUT
IOUT
10mA/DIV
10mA/DIV
VOUT
2V/DIV
100µs/DIV
500ns/DIV
Figure 16. tdOFF Response
Figure 15. tdON Response
VIN
2V/DIV
VIN = VON
2V/DIV
CIN = 10µF
V
IN = 3.3V
IOUT
IOUT
5A/DIV
500mA/DIV
VOUT
C
IN = 10µF
2V/DIV
V
V
IN = VON = 3.3V
OUT = GND
20µs/DIV
50µs/DIV
Figure 17. Short Circuit Response Time
(Output shorted to GND)
Figure 18. Current Limit Response Time
(Switch is powered into a short)
7
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Typical Characteristics
VIN
VIN
2V/DIV
2V/DIV
VON
2V/DIV
VON
2V/DIV
CIN = 10µF
OUT = 0.1µF
IN = 3.3V
IOUT
500mA/DIV
IOUT
500mA/DIV
CIN = 10µF
OUT = 10µF
IN = 3.3V
C
V
C
V
VOUT
VOUT
2V/DIV
2V/DIV
50µs/DIV
50µs/DIV
Figure 19. Current Limit Response Time
Figure 20. Current Limit Response Time
(Output is loaded by 2.2Ω, COUT = 0.1µF)
(Output is loaded by 2.2Ω, COUT = 10µF)
FPF2140/42/44/46
2
VDRV
VIN
5V/DIV
2V/DIV
CIN = 10µF
OUT = 0.1µF
RL = 500Ω
IN = 5.5V
C
TBLANK
VON
2V/DIV
V
VON
5V/DIV
IOUT
500mA/DIV
VOUT
5V/DIV
CIN = 10µF
OUT = 0.1µF
RL = 500Ω
C
VOUT
PGOOD
5V/DIV
V
IN = 3.3V
2V/DIV
20ms/DIV
Figure 22. TBLANK Response
10µs/DIV
Figure 21. PGOOD Response
2
FPF2140/44
TRESTART
VDRV
2V/DIV
VON
2V/DIV
IOUT
500mA/DIV
CIN = 10µF
C
OUT = 0.1µF
RL = 500Ω
IN = 3.3V
VOUT
2V/DIV
V
100ms/DIV
Figure 23. TRESTART Response
Note 2: VDRV signal forces the device to go into overcurrent condition by loading.
8
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
For preventing the switch from large power dissipation during
heavy load a short circuit detection feature is introduced. Short
circuit condition is detected by observing the output voltage.
The switch is put into short circuit current limiting mode if the
switch is loaded with a heavy load. When the output voltage
drops below VSCTH, short circuit detection threshold voltage,
the current limit value re-conditioned and short circuit current
limit value is decreased to 62.5% of the current limit value. This
keeps the power dissipation of the part below a certain limit
even at dead short conditions at 5.5V input voltage. The VSCTH
value is set to be 1V. At around 1.1V of output voltage the
switch is removed from short circuit current limiting mode and
the current limit is set to the current limit value.
Description of Operation
The FPF2140/42/43/44/46/47 are current limited switches that
protect systems and loads which can be damaged or disrupted
by the application of high currents. The core of each device is a
0.12Ω P-channel MOSFET and
a controller capable of
functioning over a wide input operating range of 1.8-5.5V. The
controller protects against system malfunctions through current
limiting, undervoltage lockout and thermal shutdown. The
current limit is preset for either 200mA or 400mA.
On/Off Control
The ON pin controls the state of the switch. Activating ON
continuously holds the switch in the on state so long as there is
no undervoltage on VIN or a junction temperature in excess of
140°C. ON is active HI and has a low threshold making it
capable of interfacing with low voltage signals. In addition,
excessive currents will cause the switch to turn off for FPF2140/
42 and FPF2144/46. The FPF2140/44 have an Auto-Restart
feature which will automatically turn the switch on again after
450ms. For the FPF2142/46, the ON pin must be toggled to
turn-on the switch again. With no auto-restart, the FPF2143/47
do not turn off in response to a over current condition but
instead remain operating in a constant current mode so long as
ON is active and the thermal shutdown or undervoltage lockout
have not activated.
Undervoltage Lockout
The undervoltage lockout turns-off the switch if the input
voltage drops below the undervoltage lockout threshold. With
the ON pin active the input voltage rising above the
undervoltage lockout threshold will cause a controlled turn-on of
the switch which limits current over-shoots.
Reverse Current Blocking
The entire FPF2140/47 family has a Reverse Current Blocking
feature that protects input source against current flow from
output to input. For a standard USB power design, this is an
important feature which protects the USB host from being
damaged due to reverse current flow on VBUS. The reverse
current blocking feature is active when the load switch is turned
off.
The ON pin control voltage and VIN pin have independent
recommended operating ranges. The ON pin voltage can be
driven by a voltage level higher than the input voltage.
If ON pin is LO and output voltage become greater than input
voltage, no current can flow from the output to the input . The
FLAGB operation is independent of the Reverse Current
blocking feature and will not report a fault condition if this
feature is activated.
Fault Reporting
Upon the detection of an over-current, an input undervoltage, or
an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2140/42/44/46, the FLAGB
goes LO at the end of the blanking time while FLAGB goes LO
immediately for the FPF2143/47. FLAGB remains LO through
the Auto-Restart Time for the FPF2140/44. For the FPF2142/
46, FLAGB is latched LO and ON must be toggled to release it.
With the FPF2143/47, FLAGB is LO during the faults and
immediately returns HI at the end of the fault condition. FLAGB
is an open-drain MOSFET which requires a pull-up resistor
between VIN and FLAGB. During shutdown, the pull-down on
FLAGB is disabled to reduce current draw from the supply.
Thermal Shutdown
The thermal shutdown protects the die from internally or
externally generated excessive temperatures. During an
over-temperature condition the FLAGB is activated and the
switch is turned-off. The switch automatically turns-on again if
temperature of the die drops below the threshold temperature.
Timing Diagram
Current Limiting
90%
The current limit guarantees that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. For the FPF2140/42/43 the minimum current
is 200mA and the maximum current is 400mA and for the
FPF2144/46/47 the minimum current is 400mA and the
maximum current is 800mA. The FPF2140/42/44/46 have a
blanking time of 30ms, nominally, during which the switch will
act as a constant current source. At the end of the blanking
time, the switch will be turned-off and the FLAGB pin will
activate to indicate that current limiting has occurred. The
FPF2143/47 have no current limit blanking period so
immediately upon a current limit condition FLAGB is activated.
These parts will remain in a constant current state until the ON
pin is deactivated or the thermal shutdown turns-off the switch.
VON
10%
90%
90%
VOUT
10%
10%
t
tF
R
tdON
td
OFF
tON
tOFF
where:
tdON
tR
tON
tdOFF
tF
=
=
=
=
=
=
Delay On Time
VOUT Rise Time
Turn On Time
Delay Off Time
VOUT Fall Time
Turn Off Time
tOFF
9
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Application Information
Typical Application
LOAD
VOUT
VIN
FPF2140/2/3/4/6/7
Typical value = 100KΩ
R1 = 100KΩ
Battery
1.8V-5.5V
PGOOD
ON
FLAGB
R2 = 499Ω
OFF ON
C1 = 4.7µF
C2 = 0.1µF
GND
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitor or a short-circuit, a capacitor needs to be placed
between VIN and GND. A 4.7µF ceramic capacitor, CIN, must be
placed close to the VIN pin. A higher value of CIN can be used to
further reduce the voltage drop experienced as the switch is
turned on into a large capacitive load.
When using the FPF2142/46 attention must be given to the
manual resetting of the part. The junction temperature will only
be allowed to increase to the thermal shutdown threshold. Once
this temperature has been reached, toggling ON will not turn-on
the switch until the junction temperature drops. For the
FPF2140/44, a short on the output will cause the part to operate
in a constant current state dissipating a worst case power as
calculated in (3) until the thermal shutdown activates. It will then
cycle in and out of thermal shutdown so long as the ON pin is
active and the short is present.
Output Capacitor
A 0.1uF capacitor COUT, should be placed between VOUT and
GND. This capacitor will prevent parasitic board inductances
from forcing VOUT below GND when the switch turns-off. For the
FPF2140/42/44/46, the total output capacitance needs to be
kept below a maximum value, COUT(max), to prevent the part
from registering an over-current condition and turning-off the
switch. The maximum output capacitance can be determined
from the following formula,
Board Layout
For best performance, all traces should be as short as possible.
To be most effective, the input and output capacitors should be
placed close to the device to minimize the effects that parasitic
trace inductances may have on normal and short-circuit
operation. Using wide traces for VIN, VOUT and GND will help
minimize parasitic electrical effects along with minimizing the
case to ambient thermal impedance.
(1)
ILIM(max) x tBLANK(min)
COUT(max) =
VIN
The middle pad (pin 7) should be connected to the GND plate
of PCB for improving thermal performance of the load switch.
An improper layout could result higher junction temperature and
triggering the thermal shutdown protection feature. This concern
applies specially with FPF2143 and FPF2147 where load switch
turns on into an overcurrent condition and switch supplies
constant current limit value. In this case power dissipation of the
switch (PD = (VIN - VOUT) x ILIM(max)) could exceed the
maximum absolute power dissipation of 1.2W.
Power Dissipation
During normal operation as a switch, the power dissipation is
small and has little effect on the operating temperature of the
part. The parts with the higher current limits will dissipate the
most power and that will only be,
(2)
P = (ILIM)2 x RDS = (0.8)2 x 0.12 = 76.8mW
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2140/44, the power dissipation will scale by the
Auto-Restart Time, tRSTRT, and the Over Current Blanking Time,
t
BLANK, so that the maximum power dissipated is,
tBLANK
tBLANK + tRSTRT
P(max) =
=
x VIN(max) x ILIM(max)
30
30 + 450
(3)
x 5.5 x 0.8 = 275mW
10
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
Application Notes
Startup Power Sequence
To Load
VOUT1
VIN1
FPF2140/2/
3/4/6/7
PGOOD
ON
VIN1
FLAGB
OFF ON
GND
100KΩ
To Load
VOUT2
VIN2
FPF2140/2/
3/4/6/7
PGOOD
ON
VIN2
FLAGB
GND
100KΩ
TP
Power good function in sequential startup. No battery is loaded to the output
Power Good
Sequential Startup using Power Good
FPF214X family has a "Power Good" feature. PGOOD pin is an
open-drain MOSFET which asserts high when the output
voltage reaches 90% of the input voltage.
The power good pin can be connected to another load switch's
enable pin to implement sequential startup. PGOOD pin asserts
low when the load switch is OFF. This feature allows driving a
subsequent circuit. The above diagram illustrates power good
function in sequential startup. As the VOUT1 of the first load
switch starts to ramp to the 90% of its input voltage the second
switch remains in OFF state. Whereas the VOUT1 passes the
90% threshold, power good signal becomes active and asserts
high. This signal will turn on the second load switch and VOUT2
will start to increase. The total startup time may vary according
to the difference between supply voltages that are used in the
application.
PGOOD pin requires an external pull up resistor that is
connected to the output voltage when there is no battery in the
load side and the logic level of the subsequent controller
permits. This would give logic levels similar to a CMOS output
stage for PGOOD, while still keeping the option to tie the pull-up
to a different supply voltage. A typical value of 100KΩ is
recommended to be used as pull up resistor. The PGOOD pin
status is independent of the ON pin position. This mean that
PGOOD pin stays low when the load switch is OFF. If the Power
Good feature is not used in the application the pin can be
connected directly to GND.
11
www.fairchildsemi.com
FPF2140/42/43/44/46/47 Rev. I
0.05 C
2.0
A
1.72
1.68
2X
B
4
6
0.15
1.21
2.0
0.90
2.25
0.52(6X)
0.05 C
1
3
PIN#1 IDENT
TOP VIEW
2X
0.42(6X)
0.65
RECOMMENDED
LAND PATTERN
ꢂꢁꢈꢃꢂꢁꢂꢃ
0.10 C
ꢂꢁꢀꢂꢂꢁꢂꢃ
NOTES:
0.08 C
SIDE VIEW
C
ꢂꢁꢂꢀꢃꢂꢁꢂꢀꢃ
A. PACKAGE DOES NOT FULLY CONFORM
TO JEDEC MO-229 REGISTRATION
SEATING
PLANE
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCES PER
ASME Y14.5M, 2009.
ꢀꢁꢂꢂꢂꢁꢂꢃ
ꢄꢁꢅꢂꢂꢁꢂꢃ
D. LAND PATTERN RECOMMENDATION IS
EXISTING INDUSTRY LAND PATTERN.
(0.70)
PIN #1 IDENT
(0.20)4X
E. DRAWING FILENAME: MKT-MLP06Krev5.
1
6
3
(0.40)
ꢂꢁꢇꢀꢂꢁꢂꢃ
(6X)
ꢂꢁꢆꢂꢂꢁꢂꢃ
(0.60)
4
(6X)
C A B
ꢂꢁꢇꢂꢂꢁꢂꢃ
0.10
0.65
1.30
0.05
C
BOTTOM VIEW
ON Semiconductor and
are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries.
ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor’s product/patent
coverage may be accessed at www.onsemi.com/site/pdf/Patent−Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein.
ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards,
regardless of any support or applications information provided by ON Semiconductor. “Typical” parameters which may be provided in ON Semiconductor data sheets and/or
specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer
application by customer’s technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not
designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification
in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized
application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and
expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such
claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This
literature is subject to all applicable copyright laws and is not for resale in any manner.
PUBLICATION ORDERING INFORMATION
LITERATURE FULFILLMENT:
N. American Technical Support: 800−282−9855 Toll Free
USA/Canada
Europe, Middle East and Africa Technical Support:
Phone: 421 33 790 2910
Japan Customer Focus Center
Phone: 81−3−5817−1050
ON Semiconductor Website: www.onsemi.com
Order Literature: http://www.onsemi.com/orderlit
Literature Distribution Center for ON Semiconductor
19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA
Phone: 303−675−2175 or 800−344−3860 Toll Free USA/Canada
Fax: 303−675−2176 or 800−344−3867 Toll Free USA/Canada
Email: orderlit@onsemi.com
For additional information, please contact your local
Sales Representative
© Semiconductor Components Industries, LLC
www.onsemi.com
相关型号:
©2020 ICPDF网 联系我们和版权申明