MAX1876EEG
Analog Devices Inc./Maxim Integrated
PWM STEP-DOWN CONTROLLER
Nan stok12085 pcs
Current Limit, Enable, Frequency Control, Reset
2
-
Yes
Yes
-
Buck
MAX1876
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154", 3.90mm Width)
24-QSOP
Step-Down
100kHz ~ 600kHz
2
Positive
4.75V ~ 23V
RFQ
MAX1847EEE
Analog Devices Inc./Maxim Integrated
INVERTING PWM CONTROLLER
Nan stok13330 pcs
Enable, Frequency Control
1
98%
No
Yes
-
Flyback
MAX1847
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-QSOP
Step-Up/Step-Down
100kHz ~ 500kHz
1
Negative
3V ~ 16.5V
RFQ
TL494CDG
onsemi
IC REG CTRLR BCK/PSH-PULL 16SOIC
Nan stok5260 pcs
Dead Time Control, Frequency Control
1
48%
Yes
No
-
Buck, Push-Pull
TL494
Tube
Transistor Driver
SWITCHMODE™
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Down, Step-Up/Step-Down
200kHz
2
Positive
7V ~ 40V
RFQ
LT8390EFE
Analog Devices Inc.
IC REG CTRLR BUCK/BOOST
Nan stok17050 pcs
Current Limit, Frequency Control, Soft Start
1
95%
Yes
Yes
-
Buck-Boost
LT8390
Tube
Transistor Driver
-
-40°C ~ 125°C
Surface Mount
28-TSSOP (0.173", 4.40mm Width) Exposed Pad
28-TSSOP-EP
Step-Up/Step-Down
190kHz ~ 630kHz
1
Positive
4V ~ 60V
RFQ
MIC2166YMME
Microchip Technology
IC REG CTRLR BUCK 10MSOP
Nan stok33244 pcs
Enable, Power Good
1
82%
Yes
No
-
Buck
MIC2166
Tube
Transistor Driver
Hyper Speed Control®
-40°C ~ 125°C (TJ)
Surface Mount
10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
10-MSOP-EP
Step-Down
600kHz
1
Positive
4.5V ~ 28V
RFQ
UC2578DP
Texas Instruments
IC REG CTRLR BUCK 16SOIC
Nan stok4120 pcs
Current Limit, Soft Start
1
90%
No
No
-
Buck
UC2578
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Down
110kHz
1
Positive
14V ~ 72V
RFQ
TPS40009DGQRG4
Texas Instruments
IC REG CTRLR BUCK 10MSOP
Nan stok14790 pcs
Current Limit, Enable, Soft Start
1
93%
Yes
No
-
Buck
TPS40009
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
10-HVSSOP
Step-Down
600kHz
1
Positive
2.25V ~ 5.5V
RFQ
NCP81109FMNTXG
onsemi
IC REG BUCK ADJUSTABLE 14A 48QFN
Nan stok8910 pcs
-
-
-
-
-
-
-
NCP81109
Tape & Reel (TR)
-
-
-
Surface Mount
48-VFQFN Exposed Pad
48-QFN (6x6)
-
-
-
-
-
RFQ
TLE83862ELXUMA1
Infineon Technologies
IC REG CTRLR BOOST 14-SSOP
Nan stok32569 pcs
Enable, Frequency Control, Soft Start
1
93%
No
Yes
-
Boost
TLE83862
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 150°C (TJ)
Surface Mount
14-LSSOP (0.154', 3.90mm Width) Exposed Pad
PG-SSOP-14-EP
Step-Up
100kHz ~ 700kHz
1
Positive
4.75V ~ 45V
RFQ
UC2843D
Texas Instruments
IC REG CTRLR MULT TOP 14SOIC
Nan stok63830 pcs
Frequency Control
1
97%
No
No
-
Boost, Buck, Buck-Boost, Flyback, Forward
UC2843
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
12V ~ 28V
RFQ
LTC3869EUFD#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 28QFN
Nan stok7104 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
2
95%
Yes
No
-
Buck
LTC3869
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Down
250kHz ~ 780kHz
2
Positive
4V ~ 38V
RFQ
UC2846DW
Texas Instruments
IC REG CTRLR MULT TOP 16SOIC
Nan stok18401 pcs
Current Limit, Enable, Frequency Control, Soft Start
1
50%
Yes
Yes
-
Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
UC2846
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.295", 7.50mm Width)
16-SOIC
Step-Up, Step-Up/Step-Down
500kHz
2
Positive
6.95V ~ 40V
RFQ
UC3844BVDR2
onsemi
IC REG CTRLR PWM CM 14-SOIC
Nan stok4490 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC3844
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 36V
RFQ
LTC3780EUH#PBF
Analog Devices Inc.
IC REG CTRLR BUCK-BOOST 32QFN
Nan stok3763 pcs
Current Limit, Enable, Power Good, Soft Start
1
99%
Yes
No
-
Buck-Boost
LTC3780
Tube
Transistor Driver
-
-40°C ~ 85°C (TJ)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Up/Step-Down
200kHz ~ 400kHz
1
Positive
4V ~ 30V
RFQ
MCP1630V-E/MS
Microchip Technology
IC REG CTRLR MULT TOPOLOGY 8MSOP
Nan stok27250 pcs
-
1
-
Yes
No
-
Buck, Boost, Buck-Boost, Flyback, SEPIC
MCP1630
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
8-TSSOP, 8-MSOP (0.118', 3.00mm Width)
8-MSOP
Step-Up, Step-Down, Step-Up/Step-Down
-
1
Positive, Isolation Capable
3V ~ 5.5V
RFQ
LT1245CN8#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 8DIP
Nan stok10165 pcs
Frequency Control
1
48%
No
No
-
Buck
LT1245
Tube
Transistor Driver
-
0°C ~ 100°C (TJ)
Through Hole
8-DIP (0.300", 7.62mm)
8-PDIP
Step-Down
500kHz
1
Positive, Isolation Capable
8.2V ~ 25V
RFQ
ISL6740IV-T
Intersil
SWITCHING CONTROLLER
Nan stok28074 pcs
Enable, Frequency Control, Soft Start
1
83%
Yes
Yes
-
Full-Bridge, Half-Bridge, Push-Pull
ISL6740
Bulk
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
Step-Up/Step-Down
Up to 1MHz
2
Positive, Isolation Capable
9V ~ 16V
RFQ
RT8203GA
Richtek USA Inc.
IC REG CTRLR BUCK 28SSOP
Nan stok13290 pcs
Current Limit, Enable, On Time Control, Phase Control, Power Good
1
80%, 84%, 88%, 92%
Yes
No
-
Buck
RT8203
Tape & Reel (TR)
Transistor Driver
-
-10°C ~ 85°C (TA)
Surface Mount
28-SSOP (0.154', 3.90mm Width)
28-SSOP
Step-Down
200kHz, 300kHz, 400kHz, 500kHz
4
Positive
7V ~ 24V
RFQ
XRP6124HVES0.5-F
MaxLinear, Inc.
IC REG CTRLR BUCK SOT23-5
Nan stok5340 pcs
Enable
1
-
No
No
-
Buck
XRP6124
Bulk
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
SC-74A, SOT-753
SOT-23-5
Step-Down
100kHz ~ 1MHz
1
Positive
4.5V ~ 30V
RFQ
UC3845BN
STMicroelectronics
IC REG CTRLR BOOST/FLYBACK 8DIP
Nan stok68450 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC3845
Tube
Transistor Driver
-
-40°C ~ 150°C (TJ)
Through Hole
8-DIP (0.300', 7.62mm)
8-Mini DIP
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
S-8357B52MC-NJLT2G
ABLIC Inc.
IC REG CTRLR BOOST SOT23-5
Nan stok36390 pcs
Enable
1
83%
No
No
-
Boost
S-8357
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SC-74A, SOT-753
SOT-23-5
Step-Up
100kHz
1
Positive
0.9V ~ 10V
RFQ
UC3573DTR
Texas Instruments
IC REG CTRLR BUCK 8SOIC
Nan stok25530 pcs
Current Limit, Ramp
1
92%
No
No
-
Buck
UC3573
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
100kHz
1
Positive
4.75V ~ 30V
RFQ
MAX1714AEEP-T
Analog Devices Inc./Maxim Integrated
SWITCHING CONTROLLER, CURRENT-MO
Nan stok10982 pcs
-
-
-
-
-
-
-
MAX1714
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
SP6120BEY-L
MaxLinear, Inc.
IC REG CTRLR BUCK 16TSSOP
Nan stok14590 pcs
Enable, Frequency Control, Soft Start
1
95%
Yes
No
-
Buck
SP6120
Tube
Transistor Driver
AnyFET™
-40°C ~ 85°C (TA)
Surface Mount
16-TSSOP (0.173', 4.40mm Width)
16-TSSOP
Step-Down
300kHz
1
Positive
3V ~ 5.5V
RFQ
IRU3037CSPBF
Infineon Technologies
IC REG CTRLR BUCK/BOOST 8SOIC
Nan stok13110 pcs
Enable, Soft Start
1
90%
Yes
No
-
Buck, Boost
IRU3037
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Down
200kHz
1
Positive
4.2V ~ 25V
RFQ
ISL8105AIRZ
Intersil
SWITCHING CONTROLLER, VOLTAGE-MO
Nan stok32334 pcs
Current Limit, Enable
1
100%
Yes
No
-
Buck
ISL8105
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-VFDFN Exposed Pad
10-DFN (3x3)
Step-Down
600kHz
1
Positive
6.5V ~ 14.4V
RFQ
ISL6545IBZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 8SOIC
Nan stok15695 pcs
Current Limit, Enable
1
100%
Yes
No
-
Buck
ISL6545
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
300kHz
1
Positive
4.5V ~ 14.4V
RFQ
LTC3891EUDC#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 20QFN
Nan stok5138 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
1
99%
Yes
No
-
Buck
LTC3891
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
20-WFQFN Exposed Pad
20-QFN (3x4)
Step-Down
105kHz ~ 835kHz, 350kHz ~ 535kHz
1
Positive
4V ~ 60V
RFQ
MAX1966ESA+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 8SOIC
Nan stok11637 pcs
Enable
1
95%
Yes
No
-
Buck
MAX1966
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
102kHz
1
Positive
2.7V ~ 5.5V
RFQ
SG3525AP
STMicroelectronics
IC REG CTRLR BCK/PSH-PULL 16SOIC
Nan stok33847 pcs
Enable, Soft Start
1
49%
Yes
Yes
-
Buck, Push-Pull
SG3525
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SO
Step-Down, Step-Up/Step-Down
100Hz ~ 400kHz
2
Positive
8V ~ 35V
RFQ
LTC3850IUFD#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 28QFN
Nan stok10223 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
2
97.2%
Yes
No
-
Buck
LTC3850
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Down
250kHz ~ 780kHz
2
Positive
4V ~ 30V
RFQ
LTC1435AIS#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SOIC
Nan stok4768 pcs
Enable, Soft Start
1
99%
Yes
No
-
Buck
LTC1435
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SO
Step-Down
Up to 400kHz
1
Positive
3.5V ~ 30V
RFQ
TL1454ACPWR
Texas Instruments
IC REG CTRLR MULT TOP 16TSSOP
Nan stok17015 pcs
Dead Time Control, Frequency Control
1
100%
Yes
No
-
Buck, Boost, Flyback
TL1454
Tape & Reel (TR)
Transistor Driver
-
-20°C ~ 85°C (TA)
Surface Mount
16-TSSOP (0.173', 4.40mm Width)
16-TSSOP
Step-Up, Step-Down, Step-Up/Step-Down
50kHz ~ 2MHz
2
Positive, Isolation Capable
3.6V ~ 20V
RFQ
ISL6721ABZ-T
Renesas Electronics America Inc
IC REG CTRLR BOOST/FLYBK 16SOIC
Nan stok7721 pcs
Current Limit, Frequency Control, Power Good, Soft Start
1
75%
No
Yes
-
Boost, Flyback
ISL6721
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive, Isolation Capable
9V ~ 18V
RFQ
LT8390AEUFD#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK-BOOST 28
Nan stok3414 pcs
Current Limit, Frequency Control, Soft Start
1
95%
Yes
Yes
-
Buck-Boost
LT8390
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Up/Step-Down
645kHz ~ 2.1MHz
1
Positive
4V ~ 60V
RFQ
LM5032MTC
Texas Instruments
IC REG CTRLR FWRD CONV 16TSSOP
Nan stok8920 pcs
Frequency Control, Soft Start
2
76%
No
Yes
-
Forward Converter
LM5032
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173", 4.40mm Width)
16-TSSOP
Step-Up/Step-Down
200kHz, 600kHz
2
Positive
13V ~ 100V
RFQ
UC3843ADR2G
onsemi
IC REG CTRLR BUCK 14SOIC
Nan stok12120 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC3843
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
UC3843DTR
Texas Instruments
IC REG CTRLR MULT TOP 14SOIC
Nan stok55670 pcs
Frequency Control
1
97%
No
No
-
Boost, Buck, Buck-Boost, Flyback, Forward
UC3843
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
12V ~ 28V
RFQ
UCC28C45D
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
Nan stok29914 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback, Forward Converter
UCC28C45
Tube
Transistor Driver
-
-40°C ~ 105°C (TJ)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive
7.6V ~ 18V
RFQ
MC33060AD
onsemi
IC REG CTRLR FLYBACK 14SOIC
Nan stok8320 pcs
-
1
96%
No
No
-
Flyback
MC33060
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up/Step-Down
25kHz
1
Positive or Negative, Isolation Capable
7V ~ 40V
RFQ
ISL6721AAVZ-T
Renesas Electronics America Inc
IC REG CTRLR BOOST/FLYBK 16TSSOP
Nan stok9878 pcs
Current Limit, Frequency Control, Power Good, Soft Start
1
75%
No
Yes
-
Boost, Flyback
ISL6721
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
16-TSSOP (0.173', 4.40mm Width)
16-TSSOP
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive, Isolation Capable
9V ~ 18V
RFQ
LTC1874EGN#PBF
Linear Technology
LTC1874 - DUAL OUTPUT STEP-DN CO
Nan stok6367 pcs
Current Limit, Enable
1
100%
No
No
-
Buck
LTC1874
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-SSOP
Step-Down
550kHz
2
Positive
2.5V ~ 9.8V
RFQ
ISL8841AABZ
Intersil
ISL8841 - SINGLE-ENDED CURRENT M
Nan stok27885 pcs
-
-
-
-
-
-
-
ISL8841
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
LT8390IFE#PBF
Analog Devices Inc.
IC REG CTRLR BUCK/BOOST 28TSS
Nan stok4172 pcs
Current Limit, Frequency Control, Soft Start
1
95%
Yes
Yes
-
Buck-Boost
LT8390
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-TSSOP (0.173", 4.40mm Width) Exposed Pad
28-TSSOP-EP
Step-Up/Step-Down
190kHz ~ 630kHz
1
Positive
4V ~ 60V
RFQ
LT3845AEFE#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 16TSSOP
Nan stok7221 pcs
Enable, Frequency Control, Soft Start
1
-
Yes
Yes
-
Buck
LT3845
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173", 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Down
300kHz
1
Positive
4V ~ 60V
RFQ
MAX1523EUT
Analog Devices Inc./Maxim Integrated
MAX1523 SIMPLE BOOST CONTROLLER
Nan stok18564 pcs
Enable, Soft Start
1
90%
No
No
-
Boost, Flyback, SEPIC
MAX1523
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SOT-23-6
SOT-23-6
Step-Up, Step-Up/Step-Down
-
1
Positive
2.5V ~ 5.5V
RFQ
UCC3803N
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8DIP
Nan stok11866 pcs
Frequency Control
1
99%
No
No
-
Buck, Boost, Flyback, Forward Converter
UCC3803
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Through Hole
8-DIP (0.300', 7.62mm)
8-PDIP
Step-Up, Step-Down, Step-Up/Step-Down
31kHz
1
Positive
3.6V ~ 12V
RFQ
ISL6520CBZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 8SOIC
Nan stok17860 pcs
Phase Control
1
100%
Yes
No
-
Buck
ISL6520
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
300kHz
1
Positive
4.5V ~ 5.5V
RFQ
LT1737CS#PBF
Analog Devices Inc.
IC REG CTRLR FLYBACK 16SOIC
Nan stok6856 pcs
Enable, Soft Start
1
90%
No
No
-
Flyback
LT1737
Tube
Transistor Driver
-
0°C ~ 100°C (TJ)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SO
Step-Up/Step-Down
90kHz ~ 115kHz
1
Positive or Negative, Isolation Capable
4.1V ~ 20V
RFQ
UCC2897RTJT
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 20QFN
Nan stok10989 pcs
Enable, On Time Control, Soft Start
1
74%
Yes
Yes
-
Flyback, Forward Converter
UCC2897
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
20-WFQFN Exposed Pad
20-QFN (4x4)
Step-Up/Step-Down
250kHz
1
Positive, Isolation Capable
8.5V ~ 14.5V
RFQ