TPS5210PWPR
Texas Instruments
IC REG CTRLR BUCK 28HTSSOP
I lager6738 pcs
Current Limit, Enable, Power Good, Soft Start
1
-
Yes
No
-
Buck
TPS5210
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 125°C (TJ)
Surface Mount
28-PowerTSSOP (0.173", 4.40mm Width)
28-HTSSOP
Step-Down
-
1
Positive
11.4V ~ 13V
RFQ
UCC3801DTRG4
Texas Instruments
IC REG CTRLR MULT TOPOLOGY 8SOIC
I lager14570 pcs
Frequency Control
1
49%
No
No
-
Buck, Boost, Flyback, Forward Converter
UCC3801
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Down, Step-Up/Step-Down
46kHz
1
Positive
7.4V ~ 12V
RFQ
UC2844BNG
onsemi
IC REG CTRLR PWM CM 8-DIP
I lager86440 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback
UC2844
Tube
Transistor Driver
-
-25°C ~ 85°C (TA)
Through Hole
8-DIP (0.300', 7.62mm)
8-PDIP
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 36V
RFQ
IRS27951STRPBF
Infineon Technologies
IC REG CTRLR BUCK/HALF-BRG 8SOIC
I lager12170 pcs
Enable, Frequency Control
2
50%
Yes
No
-
Buck, Half-Bridge
IRS27951
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 150°C (TJ)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Down, Step-Up/Step-Down
Up to 500kHz
2
Positive, Isolation Capable
12V ~ 18V
RFQ
TPS5103IDB
Texas Instruments
IC REG CTRLR BUCK 20SSOP
I lager13440 pcs
Current Limit, Frequency Control, Soft Start
1
-
Yes
No
-
Buck
TPS5103
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
20-SSOP (0.209', 5.30mm Width)
20-SSOP
Step-Down
200kHz
1
Positive
4.5V ~ 25V
RFQ
LTC1628IG-SYNC#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 28SSOP
I lager2732 pcs
Enable, Frequency Control, Power Good, Soft Start
2
99.4%
Yes
No
-
Buck
LTC1628
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.209", 5.30mm Width)
16-SSOP
Step-Down
220kHz
2
Positive
3.5V ~ 30V
RFQ
LTC3828EUH#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 32QFN
I lager3583 pcs
Enable, Phase Control, Power Good, Tracking
2
99.4%
Yes
No
-
Buck
LTC3828
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 85°C (TA)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
260kHz ~ 550kHz
2
Positive
4.5V ~ 28V
RFQ
LTC3773EG#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 36SSOP
I lager5414 pcs
Enable, Power Good, Tracking
3
98.5%
Yes
No
-
Buck
LTC3773
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
36-SSOP (0.209", 5.30mm Width)
36-SSOP
Step-Down
220kHz ~ 560kHz
3
Positive
3.3V ~ 36V
RFQ
LTC3773EG#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 36SSOP
I lager6236 pcs
Enable, Power Good, Tracking
3
98.5%
Yes
No
-
Buck
LTC3773
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
36-SSOP (0.209", 5.30mm Width)
36-SSOP
Step-Down
220kHz ~ 560kHz
3
Positive
3.3V ~ 36V
RFQ
LTC7815IUHF#PBF
Analog Devices Inc.
LOW IQ, 2.25MHZ, TRIPLE OUTPUT,
I lager4719 pcs
Power Good, Soft Start, Tracking
2
100%
Yes
No
-
Buck, Buck, Boost
LTC7815
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
38-WFQFN Exposed Pad
38-QFN (5x7)
Step-Up, Step-Up/Step-Down
320kHz ~ 2.25MHz
3
Positive
4.5V ~ 38V
RFQ
MCP1650S-E/MS
Microchip Technology
IC REG CTRLR MULT TOPOLOGY 8MSOP
I lager24524 pcs
Current Limit, Enable, Low Battery, Power Good
1
80%
No
No
-
Boost, Flyback, SEPIC
MCP1650
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-MSOP
Step-Up, Step-Up/Step-Down
750kHz
1
Positive
2.7V ~ 5.5V
RFQ
LT8390AIUFD#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK-BOOST 28
I lager3603 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
LTC3835IFE#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 20TSSOP
I lager4563 pcs
Enable, Phase Control, Power Good, Soft Start, Tracking
1
99.4%
Yes
No
-
Buck
LTC3835
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
20-TSSOP (0.173', 4.40mm Width) Exposed Pad
20-TSSOP-EP
Step-Down
250kHz ~ 530kHz
1
Positive
4V ~ 36V
RFQ
CS5211GDR14
onsemi
IC REG CTRLR BUCK 14SOIC
I lager8850 pcs
Frequency Control
1
-
Yes
No
-
Buck
CS5211
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Down
150kHz ~ 750kHz
1
Positive
4.5V ~ 14V
RFQ
LTC3854EDDB
Analog Devices Inc.
IC POWER MANAGEMENT
I lager12480 pcs
Enable, Soft Start
1
98%
Yes
No
-
Buck
LTC3854
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
12-WFDFN Exposed Pad
12-DFN (3x2)
Step-Down
400kHz
1
Positive
4.5V ~ 38V
RFQ
LTC1735CGN#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 16SSOP
I lager6712 pcs
Enable, Power Good, Soft Start
1
99.4%
Yes
No
-
Buck
LTC1735
Tube
Transistor Driver
-
0°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154', 3.90mm Width)
16-SSOP
Step-Down
300kHz
1
Positive
4V ~ 30V
RFQ
LTC3874IUFD#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 28QFN
I lager6519 pcs
Current Limit, Enable, Frequency Control, Phase Control
2
-
Yes
Yes
-
Buck
LTC3874
Tape & Reel (TR)
Transistor Driver
PolyPhase®
-40°C ~ 125°C (TJ)
Surface Mount
28-WFQFN Exposed Pad
28-QFN (4x5)
Step-Down
250kHz ~ 1MHz
2
Positive
4.5V ~ 38V
RFQ
LM34936RHFT
Texas Instruments
30-V WIDE VIN SYNCHRONOUS 4-SWIT
I lager8317 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
1
100%
Yes
Yes
-
Buck-Boost
LM34936
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
28-VFQFN Exposed Pad
28-VQFN (5x4)
Step-Up/Step-Down
100kHz ~ 600kHz
1
Positive
4.2V ~ 30V
RFQ
LTC3786EUD#PBF
Analog Devices Inc.
IC REG CTRLR MULT TOPOLOGY 16QFN
I lager7438 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start
1
96%
Yes
No
-
Boost, Flyback, SEPIC
LTC3786
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-WFQFN Exposed Pad
16-QFN (3x3)
Step-Up, Step-Up/Step-Down
105kHz ~ 760kHz
1
Positive
4.5V ~ 38V
RFQ
MP8670DN-LF-Z
Monolithic Power Systems Inc.
IC REG CTRLR BUCK 8SOIC
I lager13401 pcs
Enable
1
90%
No
Yes
-
Buck
MP8670
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width) Exposed Pad
8-SOICE
Step-Down
420kHz
1
Positive
4.5V ~ 30V
RFQ
UC2842AN
onsemi
IC REG CTRLR FLYBK ISO PWM 8-DIP
I lager7230 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC2842
Tube
Transistor Driver
-
-25°C ~ 85°C (TA)
Through Hole
8-DIP (0.300", 7.62mm)
8-PDIP
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
10V ~ 30V
RFQ
MAX17500BAUB+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BOOST/SEPIC 10UMAX
I lager27505 pcs
Enable
1
75%
No
No
-
Boost, SEPIC
MAX17500
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
10-TFSOP, 10-MSOP (0.118', 3.00mm Width)
10-uMAX/uSOP
Step-Up, Step-Up/Step-Down
50kHz ~ 2.5MHz
1
Positive, Isolation Capable
23.6V ~ 30V
RFQ
MAX15004AAUE/V+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR MULT TOP 16TSSOP
I lager10388 pcs
Enable, Frequency Control, Soft Start
1
50%
No
Yes
-
Boost, Flyback, SEPIC
MAX15004
Tube
Transistor Driver
Automotive, AEC-Q100
-40°C ~ 125°C (TJ)
Surface Mount
16-TSSOP (0.173', 4.40mm Width) Exposed Pad
16-TSSOP-EP
Step-Up, Step-Up/Step-Down
15kHz ~ 500kHz
1
Positive, Isolation Capable
4.5V ~ 40V
RFQ
LTC3834EUFD#PBF
Linear Technology
LTC3834 - IQ SYNCHRONOUS STEP-DO
I lager6885 pcs
Current Limit, Dead Time Control, Enable, Phase Control, Power Good, Soft Start, Tracking
1
99.4%
Yes
No
-
Buck
LTC3834
Bulk
Transistor Driver
-
-40°C ~ 85°C
Surface Mount
20-WFQFN Exposed Pad
20-QFN (4x5)
Step-Down
250kHz ~ 530kHz
1
Positive
4V ~ 36V
RFQ
ISL6526IBZ-T
Renesas Electronics America Inc
IC REG CTRLR BUCK 14SOIC
I lager17290 pcs
Enable, Phase Control
1
100%
Yes
No
-
Buck
ISL6526
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SOIC
Step-Down
600kHz
1
Positive
2.97V ~ 3.63V
RFQ
UC3843BDG
onsemi
IC REG CTRLR FLYBACK 14SOIC
I lager74920 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC3843
Tube
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
ADP1871ACPZ-0.6-R7
Analog Devices Inc.
IC REG CTRLR BUCK 10LFCSP
I lager26183 pcs
Enable
1
65%
Yes
No
-
Buck
ADP1871
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
10-VFDFN Exposed Pad, CSP
10-LFCSP-WD (3x3)
Step-Down
600kHz
1
Positive
2.95V ~ 20V
RFQ
ISL6224CA
Intersil
SWITCHING CONTROLLER
I lager9380 pcs
Enable, Phase Control, Power Good, Soft Start
1
94%
Yes
No
-
Buck
ISL6224
Tube
Transistor Driver
-
-10°C ~ 85°C (TA)
Surface Mount
16-SSOP (0.154", 3.90mm Width)
16-QSOP
Step-Down
300kHz, 600kHz
1
Positive
4.75V ~ 5.25V
RFQ
AP2014SG-13
Diodes Incorporated
IC REG CTRLR BUCK SOP-8L
I lager16430 pcs
Soft Start
1
90%
Yes
No
-
Buck
AP2014
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 125°C (TJ)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOP
Step-Down
200kHz
1
Positive
5V, 12V
RFQ
UCC38C42DR
Texas Instruments
IC OFFLINE CTRLR PWM UVLO 8SOIC
I lager55350 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback, Forward Converter
UCC38C42
Tape & Reel (TR)
Transistor Driver
-
0°C ~ 70°C (TJ)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
Up to 1MHz
1
Positive
9V ~ 18V
RFQ
UC2825DWTR
Texas Instruments
IC REG CTRLR MULT TOP 16SOIC
I lager11933 pcs
Current Limit, Enable, Frequency Control, Ramp, Soft Start
1
80%
No
No
-
Boost, Flyback, Forward Converter, Full-Bridge, Half-Bridge, Push-Pull
UC2825
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-SOIC (0.295', 7.50mm Width)
16-SOIC
Step-Up, Step-Up/Step-Down
340kHz ~ 460kHz
2
Positive
8.4V ~ 30V
RFQ
ISL6440IAZ
Renesas Electronics America Inc
IC REG CTRLR BUCK 24QSOP
I lager11772 pcs
Enable, Phase Control, Power Good, Soft Start
2
93%
Yes
No
-
Buck
ISL6440
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
24-SSOP (0.154", 3.90mm Width)
24-QSOP
Step-Down
300kHz
2
Positive
5.6V ~ 24V
RFQ
LTC1148CS#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 14SOIC
I lager5752 pcs
Current Limit, Enable
1
100%
Yes
No
-
Buck
LTC1148
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
14-SOIC (0.154', 3.90mm Width)
14-SO
Step-Down
Up to 250kHz
1
Positive
3.5V ~ 20V
RFQ
LTC3708EUH#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 32QFN
I lager5237 pcs
Enable, Power Good, Soft Start, Tracking
2
-
Yes
Yes
-
Buck
LTC3708
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
-
2
Positive
3.2V ~ 36V
RFQ
CS5322GDWR28
onsemi
SWITCHING CONTROLLER
I lager35493 pcs
-
-
-
-
-
-
-
CS5322
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
UC3843AD
onsemi
IC REG CTRLR 8SOIC
I lager4990 pcs
Frequency Control
1
96%
No
No
-
Boost, Flyback
UC3843
Tube
Transistor Driver
-
0°C ~ 70°C (TA)
Surface Mount
8-SOIC (0.154", 3.90mm Width)
8-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive, Isolation Capable
7.6V ~ 30V
RFQ
TPS53211RGTR
Texas Instruments
IC REG CTRLR BUCK 16QFN
I lager49580 pcs
Enable, Frequency Control, Phase Control, Power Good
1
70%
Yes
No
-
Buck
TPS53211
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
16-VFQFN Exposed Pad
16-VQFN (3x3)
Step-Down
250kHz ~ 1MHz
1
Positive
4.5V ~ 14V
RFQ
MAX5021EUA+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR MULT TOPOLOGY 8UMAX
I lager6890 pcs
-
1
50%
No
No
-
Flyback, Forward Converter
MAX5021
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
8-uMAX/uSOP
Step-Up/Step-Down
262kHz
1
Positive, Isolation Capable
11V ~ 28V
RFQ
LTC3892IUH-2#TRPBF
Analog Devices Inc.
IC REG CTRLR BUCK 32QFN
I lager4204 pcs
Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
2
99%
Yes
No
-
Buck
LTC3892
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
105kHz ~ 835kHz, 350kHz ~ 535kHz
2
Positive
4.5V ~ 60V
RFQ
SMBT1345LT1
onsemi
SS SOT23 GP XSTR SPCL TR
I lager1695950 pcs
-
-
-
-
-
-
-
SMBT1345
Bulk
-
*
-
-
-
-
-
-
-
-
-
RFQ
LTC3828EUH#PBF
Analog Devices Inc.
IC REG CTRLR BUCK 32QFN
I lager5847 pcs
Enable, Phase Control, Power Good, Tracking
2
99.4%
Yes
No
-
Buck
LTC3828
Tube
Transistor Driver
PolyPhase®
-40°C ~ 85°C (TA)
Surface Mount
32-WFQFN Exposed Pad
32-QFN (5x5)
Step-Down
260kHz ~ 550kHz
2
Positive
4.5V ~ 28V
RFQ
IRU3037CSTR
Infineon Technologies
IC REG CTRLR BUCK/BOOST 8SOIC
I lager5310 pcs
Enable, Soft Start
1
90%
Yes
No
-
Buck, Boost
IRU3037
Tape & Reel (TR)
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
NCP1583DR2G
onsemi
IC REG CTRLR BUCK 8SOIC
I lager7420 pcs
Enable, Phase Control
1
75%
Yes
No
-
Buck
NCP1583
Tape & Reel (TR)
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 ~ 13.2V
RFQ
TL2844BDR
Texas Instruments
IC REG CTRLR BST FLYBK CM 14SOIC
I lager114740 pcs
Frequency Control
1
48%
No
No
-
Boost, Flyback, Forward
TL2844
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
14-SOIC (0.154", 3.90mm Width)
14-SOIC
Step-Up, Step-Up/Step-Down
Up to 500kHz
1
Positive
10V ~ 30V
RFQ
LT8710EFE#PBF
Analog Devices Inc.
IC REG CTRLR MULT TOP 20TSSOP
I lager5406 pcs
Enable, Frequency Control, Soft Start
1
-
Yes
Yes
-
Boost, Flyback, SEPIC
LT8710
Tube
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
20-TSSOP (0.173', 4.40mm Width) Exposed Pad
20-TSSOP-EP
Step-Up, Step-Down, Step-Up/Step-Down
100kHz ~ 750kHz
1
Positive or Negative
4.5V ~ 80V
RFQ
MAX771ESA+
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BOOST 8SOIC
I lager5310 pcs
Enable
1
-
No
No
-
Boost
MAX771
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-SOIC (0.154', 3.90mm Width)
8-SOIC
Step-Up
300kHz
1
Positive
3V ~ 16.5V
RFQ
LTC7804IUD#TRPBF
Analog Devices Inc.
LOW IQ SYNCH BOOST CONTROLLER
I lager9933 pcs
-
1
100%
Yes
No
-
Boost
LTC7804
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 125°C (TJ)
Surface Mount
16-WFQFN Exposed Pad
16-QFN (3x3)
Step-Up
100kHz ~ 3MHz
1
Positive
4.5V ~ 40V
RFQ
LTC1909-8EG#PBF
Analog Devices Inc.
IC REG CTRLR BUCK SMBUS 28SSOP
I lager3119 pcs
Enable, Power Good, Soft Start
1
90%
Yes
No
I²C, SMBus
Buck
LTC1909
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
28-SSOP (0.209", 5.30mm Width)
28-SSOP
Step-Down
-
1
Positive
4V ~ 36V
RFQ
MAX5060ETI+T
Analog Devices Inc./Maxim Integrated
IC REG CTRLR BUCK 28TQFN
I lager7936 pcs
Current Limit, Enable, Frequency Control, Power Good
1
-
Yes
Yes
-
Buck
MAX5060
Tape & Reel (TR)
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
28-WFQFN Exposed Pad
28-TQFN (5x5)
Step-Down
125kHz ~ 1.5MHz
1
Positive
4.75V ~ 28V
RFQ
UCC2813PW-0
Texas Instruments
IC REG CTRLR MULT TOP 8TSSOP
I lager24440 pcs
Frequency Control
1
99%
No
No
-
Boost, Flyback, Forward Converter
UCC2813
Tube
Transistor Driver
-
-40°C ~ 85°C (TA)
Surface Mount
8-TSSOP (0.173', 4.40mm Width)
8-TSSOP
Step-Up, Step-Up/Step-Down
-
1
Positive
6.9V ~ 12V
RFQ