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FPF2147 [ONSEMI]

提供反向电流阻隔的全功能负载开关;
FPF2147
型号： FPF2147
厂家： ONSEMI    ONSEMI
描述：

提供反向电流阻隔的全功能负载开关

开关 驱动 接口集成电路 驱动器
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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  
ꢂꢁꢈꢃ“ꢂꢁꢂꢃ  
0.10 C  
ꢂꢁꢀꢂ“ꢂꢁꢂꢃ  
NOTES:  
0.08 C  
SIDE VIEW  
C
ꢂꢁꢂꢀꢃ“ꢂꢁꢂꢀꢃ  
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.  
ꢀꢁꢂꢂ“ꢂꢁꢂꢃ  
ꢄꢁꢅꢂ“ꢂꢁꢂꢃ  
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)  
ꢂꢁꢇꢀ“ꢂꢁꢂꢃ  
(6X)  
ꢂꢁꢆꢂ“ꢂꢁꢂꢃ  
(0.60)  
4
(6X)  
C A B  
ꢂꢁꢇꢂ“ꢂꢁꢂꢃ  
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.  
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