MAX8529EEG+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK/BCK-BST 24QSOP
Na lageru7170 pcs
Current Limit, Enable, Frequency Control, Reset
2
-
Yes
Yes
-
Buck, Buck-Boost
MAX8529
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154', 3.90mm Width)
24-QSOP
Step-Down, Step-Up/Step-Down
600kHz ~ 1.2MHz
2
Positive
4.75V ~ 23V
RFQ
MIC2194BM
Microchip Technology
IC REG CTRLR BUCK/BUCK-BST 8SOIC
Na lageru8270 pcs
Enable
1
100%
No
No
-
Buck, Buck-Boost
MIC2194
Bulk
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down, Step-Up/Step-Down
400kHz
1
Positive
2.9V ~ 14V
RFQ
ISL6742BAAZA
Renesas Electronics America Inc
IC REG CTRLR MULT TOP 16QSOP
Na lageru9337 pcs
Frequency Control, Ramp, Soft Start
1
99%
Yes
No
-
Full-Bridge, Half-Bridge
ISL6742
Tube
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-QSOP
Step-Up/Step-Down
Up to 2MHz
1
Positive, Isolation Capable
9V ~ 16V
RFQ
LTC7801IUFD#PBF
Analog Devices Inc.
IC REG CTRLR SYNC BUCK 24QFN
Na lageru3611 pcs
Current Limit, Power Good, Soft Start, Tracking
1
100%
No
No
-
Buck
LTC7801
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
24-WFQFN Exposed Pad
24-QFN (4x5)
Step-Down
50kHz ~ 900kHz
1
Positive
4V ~ 140V
RFQ
S-8521A36MC-AXVT2G
ABLIC Inc.
IC REG CTRLR BUCK SOT23-5
Na lageru61170 pcs
Enable
1
100%
No
No
-
Buck
S-8521
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
SC-74A, SOT-753
SOT-23-5
Step-Down
180kHz
1
Positive
2.5V ~ 10V
RFQ
LTC3890IUH#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK/SEPIC 32QFN
Na lageru3081 pcs
Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
2
99%
Yes
No
-
Buck
LTC3890
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 125°C (TJ)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
105kHz ~ 835kHz, 350kHz ~ 535kHz
2
Positive
4V ~ 60V
RFQ
LTC3866EUF#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 24QFN
Na lageru9478 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
1
-
Yes
No
-
Buck
LTC3866
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
24-WFQFN Exposed Pad
24-QFN (4x4)
Step-Down
250kHz ~ 770kHz
1
Positive
4.5V ~ 38V
RFQ
LM2647MTC
Texas Instruments
IC REG CTRLR BUCK 28TSSOP
Na lageru6180 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
2
75%
Yes
No
-
Buck
LM2647
Tube
Transistor Driver
-
-5°C ~ 125°C (TJ)
Surface Mount
28-TSSOP (0.173', 4.40mm Width)
28-TSSOP
Step-Down
200kHz ~ 500kHz
2
Positive
5.5V ~ 28V
RFQ
S-8352A50MC-K3JT2G
ABLIC Inc.
IC REG CTRLR BOOST SOT23-5
Na lageru42440 pcs
Enable
1
75%
No
No
-
Boost
S-8352
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
RT8120BGSP
Richtek USA Inc.
IC REG CTRLR BUCK 8SOP
Na lageru11240 pcs
Enable, Phase Control
1
85%
Yes
No
-
Buck
RT8120
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width) Exposed Pad
8-SOP-EP
Step-Down
300kHz
1
Positive
3V ~ 13.2V
RFQ
HIP6311ACB
Renesas Electronics America Inc
IC REG CTRLR BUCK 20SOIC
Na lageru5540 pcs
Enable, Frequency Control, Power Good
4
-
-
No
-
Buck
HIP6311
Tube
PWM Signal
-
0°C ~ 70°C (TA)
Surface Mount
20-SOIC (0.295", 7.50mm Width)
20-SOIC
Step-Down
50kHz ~ 1.5MHz
4
Positive
4.75V ~ 5.25V
RFQ
TL5001AIDR
Texas Instruments
IC REG CTRLR BCK/BST/FLYBK 8SOIC
Na lageru38646 pcs
Dead Time Control, Frequency Control
1
100%
No
No
-
Buck, Boost, Flyback
TL5001
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
20kHz ~ 500kHz
1
Positive
3.6V ~ 40V
RFQ
LTC3854EMSE#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 12MSOP
Na lageru15272 pcs
Enable, Soft Start
1
98%
Yes
No
-
Buck
LTC3854
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
12-TSSOP (0.118', 3.00mm Width) Exposed Pad
12-MSOP-EP
Step-Down
400kHz
1
Positive
4.5V ~ 38V
RFQ
MAX16990AUBA/V+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BOOST/SEPIC 10UMAX
Na lageru17228 pcs
Current Limit, Enable, Frequency Control, Power Good
1
93%
No
Yes
-
Boost, SEPIC
MAX16990
Tube
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width) Exposed Pad
10-uMAX-EP
Step-Up, Step-Up/Step-Down
220kHz ~ 1MHz
1
Positive
4.5V ~ 36V
RFQ
S-8352B30MA-K4PT2G
ABLIC Inc.
IC REG CTRLR BOOST SOT23-3
Na lageru52900 pcs
-
1
75%
No
No
-
Boost
S-8352
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
TO-236-3, SC-59, SOT-23-3
SOT-23-3
Step-Up
100kHz
1
Positive
0.9V ~ 10V
RFQ
ISL6526AIRZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 16QFN
Na lageru10260 pcs
Enable, Phase Control
1
100%
Yes
No
-
Buck
ISL6526
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-VQFN Exposed Pad
16-QFN (5x5)
Step-Down
600kHz
1
Positive
2.97V ~ 3.63V
RFQ
TPS40197RGYR
Texas Instruments
IC REG CTRLR BUCK 16QFN
Na lageru20836 pcs
Enable, Power Good
1
85%
Yes
No
-
Buck
TPS40197
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-VFQFN Exposed Pad
16-VQFN (4x3.5)
Step-Down
520kHz
1
Positive
4.5V ~ 14V
RFQ
ISL6740IBZ-T
Renesas Electronics America Inc
IC REG CTRLR MULT TOP 16SOIC
Na lageru13470 pcs
Enable, Frequency Control, Soft Start
1
83%
Yes
Yes
-
Full-Bridge, Half-Bridge, Push-Pull
ISL6740
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 105°C (TA)
Surface Mount
16-SOIC (0.154', 3.90mm Width)
16-SOIC
Step-Up/Step-Down
Up to 1MHz
2
Positive, Isolation Capable
9V ~ 16V
RFQ
SMBV1008LT1
onsemi
SS SOT23 TUNE DIO SPCL TR
Na lageru2428250 pcs
-
-
-
-
-
-
-
SMBV1008
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
UC2843AQD8R
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
Na lageru58530 pcs
Frequency Control
1
96%
No
No
-
Boost, Buck, Flyback, Forward
UC2843
Tape & Reel (TR)
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
ISL6527CB
Intersil
SWITCHING CONTROLLER
Na lageru5610 pcs
Enable, Phase Control
1
100%
Yes
No
-
Buck
ISL6527
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Down
300kHz
1
Positive
2.97V ~ 3.63V
RFQ
LM3475MFX
Texas Instruments
IC REG CTRLR BUCK SOT23-5
Na lageru5030 pcs
Enable
1
100%
No
No
-
Buck
LM3475
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
SC-74A, SOT-753
SOT-23-5
Step-Down
-
1
Positive
2.7V ~ 10V
RFQ
LTC3856EUH#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 38QFN
Na lageru6937 pcs
Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
2
94%
Yes
No
-
Buck
LTC3856
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 125°C (TJ)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
250kHz ~ 770kHz
2
Positive
4.5V ~ 38V
RFQ
LTC1435ACS#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SOIC
Na lageru4746 pcs
Enable, Soft Start
1
99%
Yes
No
-
Buck
LTC1435
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SO
Step-Down
Up to 400kHz
1
Positive
3.5V ~ 30V
RFQ
UCC3805PW
Texas Instruments
IC REG CTRLR MULT TOP 8TSSOP
Na lageru14324 pcs
Frequency Control
1
49%
No
No
-
Buck, Boost, Flyback, Forward Converter
UCC3805
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-TSSOP (0.173', 4.40mm Width)
8-TSSOP
Step-Up, Step-Down, Step-Up/Step-Down
31kHz
1
Positive
3.6V ~ 12V
RFQ
ISL8117FVEZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 16QFN
Na lageru14229 pcs
Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
1
-
Yes
Yes
-
Buck
ISL8117
Tray
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173', 4.40mm Width) Exposed Pad
16-HTSSOP
Step-Down
100kHz ~ 2MHz
1
Positive
4.5V ~ 60V
RFQ
L6911DTR
STMicroelectronics
IC REG CTRLR BUCK 20SOIC
Na lageru13790 pcs
Current Limit, Frequency Control, Phase Control, Power Good, Soft Start
1
100%
Yes
No
-
Buck
L6911
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 125°C (TJ)
Surface Mount
20-SOIC (0.295", 7.50mm Width)
20-SO
Step-Down
200kHz
1
Positive
5V ~ 12V
RFQ
ISL6439CBZ
Intersil
SWITCHING CONTROLLER
Na lageru12251 pcs
Enable, Phase Control
1
100%
Yes
No
-
Buck
ISL6439
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Down
300kHz
1
Positive
2.97V ~ 3.63V
RFQ
LTC3780EUH
Analog Devices Inc.
IC POWER MANAGEMENT
Na lageru17770 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
ISL8105AIRZ
Intersil
SWITCHING CONTROLLER, VOLTAGE-MO
Na lageru32334 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
LM5033SD
Texas Instruments
IC REG CTRLR PUSH-PULL 10WSON
Na lageru10540 pcs
Frequency Control, Soft Start
1
-
Yes
Yes
-
Full-Bridge, Half-Bridge, Push-Pull
LM5033
Tape & Reel (TR)
PWM Signal
-
-40°C ~ 125°C (TJ)
Surface Mount
10-WDFN Exposed Pad
10-WSON (4x4)
Step-Up/Step-Down
200kHz, 600kHz
2
Positive
15V ~ 90V
RFQ
LTC3832EGN#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK/BOOST 16SSOP
Na lageru8851 pcs
Current Limit, Enable, Frequency Control, Soft Start
1
95%
Yes
No
-
Buck
LTC3832
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-SSOP
Step-Down
300kHz
1
Positive
3V ~ 8V
RFQ
FAN5037M
Fairchild Semiconductor
SWITCHING CONTROLLER
Na lageru90190 pcs
-
1
85%
No
No
-
Buck
FAN5037
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down
-
1
Positive
4.75V ~ 5.25V
RFQ
FAN5066M
onsemi
IC REG CTRLR BUCK 20SOIC
Na lageru8960 pcs
Enable, Power Good
1
95%
Yes
No
-
Buck
FAN5066
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
20-SOIC (0.295', 7.50mm Width)
20-SOIC
Step-Down
80kHz ~ 1MHz
1
Positive
4.75V ~ 5.25V
RFQ
LTC1771ES8#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 8SOIC
Na lageru8681 pcs
Enable, Soft Start
1
100%
No
No
-
Buck
LTC1771
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SO
Step-Down
-
1
Positive
2.8V ~ 18V
RFQ
MAX1967EUB-T
Analog Devices Inc./Maxim Integrated
PWM STEP-DOWN CONTROLLER
Na lageru23224 pcs
Current Limit, Enable, Dead Time Control, Pulse Skipping, Ramp, Soft Start
1
95%
Yes
No
-
Buck
MAX1967
Bulk
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
10-uMAX
Step-Down
102kHz
1
Positive
2.7V ~ 28V
RFQ
MAX15301AA02+CJK
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK PMBUS 32TQFN
Na lageru6827 pcs
Current Limit, Enable, Power Good
1
95%
Yes
Yes
PMBus
Buck
MAX15301
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
32-WFQFN Exposed Pad
32-TQFN (5x5)
Step-Down
300kHz ~ 1MHz
1
Positive
4.5V ~ 14V
RFQ
LTC1625CS#PBF
Analog Devices Inc.
IC REG CTRLR BUCK/BOOST 16SOIC
Na lageru4768 pcs
Enable, Soft Start
1
99%
Yes
Yes
-
Buck, Boost
LTC1625
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
150kHz
1
Positive or Negative
3.7V ~ 36V
RFQ
UC2845DTR
Texas Instruments
IC REG CTRLR MULT TOP 14SOIC
Na lageru58230 pcs
Frequency Control
1
48%
No
No
-
Boost, Buck, Flyback, Forward
UC2845
Tape & Reel (TR)
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
SG2524D
Texas Instruments
IC REG CTRLR MULT TOP 16SOIC
Na lageru67590 pcs
Current Limit, Frequency Control
1
45%
No
No
-
Buck, Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
SG2524
Tube
Transistor Driver
-
-25°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.154", 3.90mm Width)
16-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
450kHz
2
Positive, Isolation Capable
8V ~ 40V
RFQ
UCC28C40QDRQ1
Texas Instruments
AUTOMOTIVE BICMOS LOW-POWER CURR
Na lageru35860 pcs
Overcurrent, Ramp
1
96%
Yes
No
-
Buck, Flyback
UCC28C40
Tape & Reel (TR)
PWM
Automotive, AEC-Q100
-40°C ~ 125°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down, Step-Up/Step-Down
53kHz
1
Positive
6.6V ~ 18V
RFQ
RT8237CZQW(2)
Richtek USA Inc.
IC REG CTRLR BUCK 10WDFN
Na lageru12590 pcs
Current Limit, Enable, Phase Control, Power Good
1
-
Yes
No
-
Buck
RT8237
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
10-WFDFN Exposed Pad
10-WDFN (3x3)
Step-Down
290kHz ~ 430kHz
1
Positive
4.5V ~ 5.5V
RFQ
SP6123ACN-L/TR
MaxLinear, Inc.
IC REG CTRLR BUCK 8SOIC
Na lageru4090 pcs
-
1
93%
Yes
No
-
Buck
SP6123
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Down
500kHz
1
Positive
3V ~ 5.5V
RFQ
ISL6522CB-TR5190
Intersil
VOLTAGE MODE PWM CONTROLLER
Na lageru14456 pcs
-
-
-
-
-
-
-
-
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
UCD7230PWPR
Texas Instruments
IC REG CTRLR BUCK 20HTSSOP
Na lageru32260 pcs
Current Limit, Enable
1
-
Yes
No
-
Buck
UCD7230
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
20-PowerTSSOP (0.173', 4.40mm Width)
20-HTSSOP
Step-Down
Up to 2MHz
1
Positive
4.5V ~ 15.5V
RFQ
MIC38C45YM-TR
Microchip Technology
IC REG CTRLR MULT TOPOLOGY 8SOIC
Na lageru36470 pcs
Frequency Control
1
50%
Yes
No
-
Buck, Boost, Flyback, Forward Converter
MIC38C45
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
500kHz
1
Positive, Isolation Capable
7.6V ~ 20V
RFQ
ISL6721AB
Intersil
SWITCHING CONTROLLER
Na lageru23242 pcs
Current Limit, Frequency Control, Power Good, Soft Start
1
75%
No
Yes
-
Boost, Flyback
ISL6721
Tube
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
LTC3709EG
Analog Devices Inc.
IC ADC SMPL
Na lageru16070 pcs
Enable, Power Good, Soft Start, Tracking
2
90%
Yes
No
-
Buck
LTC3709
Bulk
Transistor Driver
PolyPhase®
-40°C ~ 85°C (TA)
Surface Mount
36-SSOP (0.209", 5.30mm Width)
36-SSOP
Step-Down
-
1
Positive
3.9V ~ 37V
RFQ
S-8337AAIA-T8T1G
ABLIC Inc.
IC REG CTRLR BOOST 8TSSOP
Na lageru35800 pcs
Current Limit, Enable, Frequency Control
1
89%
No
No
-
Boost
S-8337
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-TSSOP (0.173', 4.40mm Width)
8-TSSOP
Step-Up
257.4kHz ~ 1.134MHz
1
Positive
1.8V ~ 6V
RFQ
LT3837IFE#TRPBF
Analog Devices Inc.
IC REG CTRLR FLYBACK 16TSSOP
Na lageru5180 pcs
Enable, Frequency Control, On Time Control
1
88%
Yes
Yes
-
Flyback
LT3837
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-Up/Step-Down
100kHz
1
Positive, Isolation Capable
4.5V ~ 20V
RFQ