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Maxim > Solutions > Power Solutions for Nonportable Applications

Step-Down Controllers

DATA SHEETS
Display Title / Parts Key Advantages
QV  PDF Evaluation Kit for the MAX15023
MAX15023EVKIT
QV  PDF Evaluation Kit for the MAX15026B
MAX15026BEVKIT
QV  PDF Wide 4.5V to 28V Input, Dual-Output Synchronous Buck Controller
MAX15023

Low-Cost, Dual DC-DC Controller Operates from 4.5V to 28V Suitable for Multiple Applications
QV  PDF Low-Cost, Small, 4.5V to 28V Wide Operating Range, DC-DC Synchronous Buck Controller
MAX15026

Low-Cost, Versatile DC-DC Controller Operates from 4.5V to 28V Suitable for Multiple Applications
QV  PDF Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications
MAX15034

Dual Converter Configurable for 25A Per Output or a Single 50A Output
QV    6A, 2MHz Step-Down Regulator with Integrated Switches
MAX15039

Smallest, Most Efficient, 3A Step-Down Regulator Switches Frequencies Up to 2.4MHz
QV    4A, 2MHz Step-Down Regulator with Integrated Switches
MAX15038

Smallest, Most Efficient, 3A Step-Down Regulator Switches Frequencies Up to 2.4MHz
QV  PDF Evaluation Kit for the MAX15003
MAX15003EVKIT
QV  PDF Dual-Output Buck Controller with Tracking/Sequencing
MAX15002

Flexible, Dual Controller Delivers 15A Per Output with Sequencing and Tracking Control
QV  PDF Triple-Output Buck Controller with Tracking/Sequencing
MAX15003

Flexible, Triple Controller Delivers 15A per Output with Sequencing and Tracking Control
QV  PDF Low-Cost, Dual-Output, Step-Down Controller with Fast Transient Response
MAX8664

Lowest Cost, Dual-Output Regulator for a Wide Range of Applications
QV  PDF 3A, 2MHz Step-Down Regulator with Integrated Switches
MAX8643A

Smallest, Most-Efficient 3A Step-Down Regulator Up to a 2.4MHz Frequency
QV  PDF Evaluation Kit for the MAX8566
MAX8566EVKIT
QV  PDF Dual, 3A, 2MHz Step-Down Regulator
MAX8833

Smallest, Most Efficient, Dual 3A Regulator with Integrated Switches in 5mm × 5mm TQFN Package
QV    1- to 8-Phase, Master-Slave CPU Core Regulator with Integrated Power MOSFETs
MAX8657, MAX8658, MAX8659

25A/Phase VRM Regulator Chipset for VRD10/VRD11 and K8
Has Reference Input to Support Up to 200A Output
QV  PDF Digital Power-Supply Controller/Monitor with PMBus Interface
MAX8688

Complete Control/Monitoring of Any Power Supply with PMBus Interface
QV  PDF Dual, 5A, 2MHz Step-Down Regulator
MAX8855

Smallest, Most Efficient 5A Regulator with Integrated Switches in 5mm x 5mm TQFN Package
QV  PDF Configurable, Single-/Dual-Output, Synchronous Buck Controller for High-Current Applications
MAX5066
QV  PDF Electronically Programmable Voltage Reference
DS4305, DS4305K

Nonvolatile Sample and Infinite-Hold Adjustable Voltage Reference for Automated Factory Calibration
QV  PDF High-Efficiency, 10A, PWM Internal-Switch Step-Down Regulator
MAX8566
QV  PDF Electronically Programmable Voltage Reference
DS4303, DS4303K

Nonvolatile Sample and Infinite-Hold Adjustable Voltage Reference for Automated Factory Calibration
QV  PDF 0.6V to 5.5V Output, Parallelable, Average-Current-Mode DC-DC Controllers
MAX5060, MAX5061
QV  PDF 6A, 2MHz Step-Down Regulator with Integrated Switches
MAX8646

Smallest, Most Efficient 6A Step-Down Regulator and Up to 2.4MHz Frequency
QV  PDF Step-Down Controllers with Prebias Startup, Lossless Sensing, Synchronization, and OVP
MAX8543, MAX8544
QV  PDF Low-Cost, Current-Mode PWM Buck Controller with Foldback Current Limit
MAX1954A
QV  PDF Dual-Synchronous Buck Controllers for Point-of-Load, Tracking, and DDR Memory Power Supplies
MAX8537, MAX8538, MAX8539
QV  PDF Dual-Phase, +0.6V to +3.3V Output Parallelable, Average-Current-Mode Controllers
MAX5065, MAX5067

Dual-Phase, +0.6V to +3.3V Output, Parallelable, Average-Current-Mode Controllers
QV  PDF 4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications
MAX8553, MAX8554

4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications Offer Fastest Transient Response
QV  PDF VRM 9.0/VRM 9.1, Dual-Phase, Parallelable, Average-Current-Mode Controller
MAX5037A
QV  PDF Dual-Phase, Parallelable, Average-Current-Mode Controllers
MAX5038A, MAX5041A
QV  PDF 3A, 2MHz Step-Down Regulator with Integrated Switches
MAX8643

Smallest, Most Efficient 3A Step-Down Regulator Up to a 2.4MHz Frequency
QV  PDF Low-Cost, Wide Input Range, Step-Down Controllers with Foldback Current Limit
MAX8545, MAX8546, MAX8548

2.7V to 28V Input, 15A, Step-Down, DC-DC Controllers for Desktop and Graphic Card Supplies have Foldback Current Protection
QV  PDF Dual-Phase, Parallelable, Average Current-Mode Controllers
MAX5038, MAX5041
QV  PDF VRM 9.0, Dual-Phase, Parallelable, Average Current-Mode Controller
MAX5037
QV  PDF Low-Cost, High-Frequency, Current-Mode PWM Buck Controllers
MAX1953, MAX1954, MAX1957
QV  PDF Tracking, Sinking and Sourcing, Synchronous Buck Controller for DDR Memory and Termination Supplies
MAX1917

Reduce Capacitors and Cost of DDR Supplies



Key Specifications:   Step-Down Switching Regulators
Part Number VIN (min) (V) VIN (max) (V) Min. VOUT (V) Max. VOUT (V) Preset VOUT (V) IOUT (A) Output Adj. Method Operating Current, ICC (max) (mA) Number of DC-DC Outputs Number of LDO/Op Amp Outputs Operating Freq. (kHz) Features EV-Kit Industry Qualified Package Operating Temp. Range (°C)
MAX15002  4.5 23 0.6 18  -  20 Resistor 6 2 1 2200
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 No  -  THIN QFN/40 -40 to +125
MAX15003  4.5 23 0.6 19  -  15 Resistor 8 3 1 2200
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Reset Output
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  THIN QFN/48 -40 to +125
MAX8833  2.35 3.6 0.6 3.3  -  3 Resistor 3.5 2  -  2000
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Internal Power Switches
•Low Battery/ Power OK Output
•Shutdown
•Soft Start
•Synchronous Rectifier
 No  -  THIN QFN/32 -40 to +85
MAX8855  2.35 3.6 0.6 3.3  -  5 Resistor 3.5 2  -  2000
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Internal Power Switches
•Low Battery/ Power OK Output
•Shutdown
•Soft Start
•Synchronous Rectifier
 No  -  THIN QFN/32 -40 to +85
MAX8664  4.5 28 0.6 25  -  25 Resistor 1.8 2  -  1000
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 No  -  QSOP/20 -40 to +85
MAX8643  2.35 3.6 0.6 2.5  -  3 Digital/VID 6.5 1  -  2000
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Internal Power Switches
•Low Battery/ Power OK Output
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  THIN QFN/24 -40 to +85
MAX8646  2.35 3.6 0.6 2.5  -  6 Digital/VID 6.5 1  -  2000
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Internal Power Switches
•Low Battery/ Power OK Output
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  THIN QFN/24 -40 to +85
MAX5066  4.75 28 0.61 5.5  -  25 Resistor 20 1  -  1000
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Reset Output
•Shutdown
•Soft Start
•Synchronous Rectifier
 No Automotive - General TSSOP/28 -40 to +125
-40 to +85
MAX8566  2.3 3.6 0.6 3.1  -  10 Resistor 2.2 1  -  2400
•Adjustable Frequency
•Current Limit
•External Synchronization
•Internal Power Switches
•Low Battery/ Power OK Output
•Output Undervoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  THIN QFN/32 -40 to +85
MAX8543  3 13.2 0.8 11  -  25 Resistor 3 1  -  1000
•Adjustable Frequency
•Current Limit
•External Synchronization
•Fixed Frequency/ PWM Operation
•Output Overvoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  QSOP/16 -40 to +85
MAX8544  3 13.2 0.8 11  -  25 Resistor 3 1  -  1000
•Adjustable Frequency
•Current Limit
•External Synchronization
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  QSOP/20 -40 to +85
MAX8537  4.5 23 0.8 3.6  -  30 Resistor 7 2  -  1400
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Output Undervoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  QSOP/28 -40 to +85
MAX8538  4.5 23 0.8 3.6  -  30 Resistor 7 2  -  1400
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Output Undervoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  QSOP/28 -40 to +85
MAX8539  4.5 23 0.8 3.6  -  30 Resistor 7 2  -  1400
•Adjustable Frequency
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Output Undervoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  QSOP/28 -40 to +85
MAX5037A  4.75 28 1.1 1.85  -  60 Digital/VID 6 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Soft Start
•Synchronous Rectifier
 Yes  -  MQFP/44
THIN QFN/44 		-40 to +85
MAX5038A  4.75 28 1.2 3.3 1.2
1.5
1.8
2.5
3.3 		60 Preset 10 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Soft Start
•Synchronous Rectifier
 Yes  -  SSOP/28 -40 to +85
MAX5041A  4.75 28 1 3.3  -  60 Resistor 10 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Soft Start
•Synchronous Rectifier
 Yes  -  SSOP/28 -40 to +85
MAX5065  4.75 28 0.6 3.3  -  60 Resistor 10 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 No Automotive - General SSOP/28 -40 to +85
MAX8553  4.5 28 0 3.6  -  25 Dyn. REF In
Resistor 		1.2 1  -  200
300
400
550
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
•Voltage or PWM Controllable Output
 Yes  -  QSOP/16 -40 to +85
MAX8554  4.5 28 0.6 3.5  -  25 Resistor 1.2 1  -  200
300
400
550
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  QSOP/16 -40 to +85
MAX8545  2.7 28 0.8 23  -  15 Resistor 1.2 1  -  300
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  uMAX/10 -40 to +85
MAX8546  2.7 28 0.8 23  -  15 Resistor 1.2 1  -  300
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  uMAX/10 -40 to +85
MAX8548  2.7 28 0.8 23  -  15 Resistor 1.2 1  -  100
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  uMAX/10 -40 to +85
MAX5037  4.75 28 1.1 1.85  -  60 Digital/VID 6 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Soft Start
•Synchronous Rectifier
 Yes  -  MQFP/44
THIN QFN/44 		-40 to +85
MAX5038  4.75 28 1.2 3.3 1.2
1.5
1.8
2.5
3.3 		60 Preset 10 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Soft Start
•Synchronous Rectifier
 Yes  -  SSOP/28 -40 to +85
MAX5041  4.75 28 1 3.3  -  60 Resistor 10 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•Fixed Frequency/ PWM Operation
•Soft Start
•Synchronous Rectifier
 Yes  -  SSOP/28 -40 to +85
MAX1953  3 5.5 0.8 4.5  -  4 Resistor 1 1  -  1000
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  uMAX/10 -40 to +85
MAX1954  3 13.2 0.8 4.5  -  25 Resistor 1 1  -  300
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  uMAX/10 -40 to +85
MAX1957  3 5.5 0.4 4.5  -  3 Resistor 1 1  -  300
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Shutdown
•Soft Start
•Synchronous Rectifier
 Yes  -  uMAX/10 -40 to +85
MAX1917  4.5 22 0.4 5  -  25 Dyn. REF In
Resistor 		0.8 1 1 200
300
400
550
•Adjustable Frequency
•Current Limit
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Shutdown
•Soft Start
•Synchronous Rectifier
•Voltage or PWM Controllable Output
 Yes  -  QSOP/16 -40 to +85
MAX5060  4.75 28 0.6 5.5  -  30 Resistor 5.5 1  -  1500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Soft Start
•Synchronous Rectifier
 No Automotive - General THIN QFN/28
THIN QFN/32 		-40 to +125
MAX5061  4.75 28 0.6 5.5  -  30 Resistor 5.5 1  -  1500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Soft Start
•Synchronous Rectifier
 No Automotive - General TSSOP/16 -40 to +125
MAX5067  4.75 28 0.6 3.3  -  60 Resistor 10 1  -  250
500
•Adjustable Frequency
•Average Current Mode Control
•Current Limit
•Dual/Multi-Phase Controller
•External Synchronization
•Fixed Frequency/ PWM Operation
•Low Battery/ Power OK Output
•Output Overvoltage Protection
•Shutdown
•Soft Start
•Synchronous Rectifier
 No Automotive - General THIN QFN/44 -40 to +85
See All Step-Down Switching Regulators (223)

Key Specifications:   Switch-Mode DC-DC Power Supplies
Part Number Topology VIN (min) (V) VIN (max) (V) Number of DC-DC Outputs Preset VOUT (V) Digital/VID Programmed Output Min. Adjustable VOUT (V) Max. Adjustable VOUT (V) IOUT (A) Operating Current, ICC (max) (mA) Operating Freq. (kHz) Internal Power Switch(es) Industry Qualified Package
MAX15002  Step-Down 4.5 23 2  -   -  0.6 18 20 6 2200 No  -  THIN QFN/40
MAX15003  Step-Down 4.5 23 3  -  No 0.6 19 15 8 2200 No  -  THIN QFN/48
MAX8833  Step-Down 2.35 3.6 2  -  No 0.6 3.3 3 3.5 2000 Yes  -  THIN QFN/32
MAX8855  Step-Down 2.35 3.6 2  -  No 0.6 3.3 5 3.5 2000 Yes  -  THIN QFN/32
MAX8664  Step-Down 4.5 28 2  -   -  0.6 25 25 1.8 1000 No  -  QSOP/20
MAX8643  Step-Down 2.35 3.6 1  -  Yes  -   -  3 6.5 2000 Yes  -  THIN QFN/24
MAX8646  Step-Down 2.35 3.6 1  -  Yes  -   -  6 6.5 2000 Yes  -  THIN QFN/24
MAX5066  Step-Down 4.75 28 1  -  No 0.61 5.5 25 20 1000 No Automotive - General TSSOP/28
MAX8566  Step-Down 2.3 3.6 1  -  No 0.6 3.1 10 2.2 2400 Yes  -  THIN QFN/32
MAX8543  Step-Down 3 13.2 1  -  No 0.8 11 25 3 1000 No  -  QSOP/16
MAX8544  Step-Down 3 13.2 1  -  No 0.8 11 25 3 1000 No  -  QSOP/20
MAX8537  Step-Down 4.5 23 2  -  No 0.8  -  30 7 1400 No  -  QSOP/28
MAX8538  Step-Down 4.5 23 2  -  No 0.8  -  30 7 1400 No  -  QSOP/28
MAX8539  Step-Down 4.5 23 2  -  No 0.8  -  30 7 1400 No  -  QSOP/28
MAX5037A  Step-Down 4.75 28 1  -  Yes 1.1 1.85 60 6 250
500 		No  -  MQFP/44
THIN QFN/44
MAX5038A  Step-Down 4.75 28 1 1.2
1.5
1.8
2.5
3.3 		No  -   -  60 10 250
500 		No  -  SSOP/28
MAX5041A  Step-Down 4.75 28 1  -  No 1 3.3 60 10 250
500 		No  -  SSOP/28
MAX5065  Step-Down 4.75 28 1  -  No 0.6 3.3 60 10 250
500 		No Automotive - General SSOP/28
MAX8553  Step-Down 4.5 28 1  -  No 0 3.6 25 1.2 200
300
400
550 		No  -  QSOP/16
MAX8554  Step-Down 4.5 28 1  -  No 0.6 3.5 25 1.2 200
300
400
550 		No  -  QSOP/16
MAX8545  Step-Down 2.7 28 1  -  No 0.8 23 15 1.2 300 No  -  uMAX/10
MAX8546  Step-Down 2.7 28 1  -  No 0.8 23 15 1.2 300 No  -  uMAX/10
MAX8548  Step-Down 2.7 28 1  -  No 0.8 23 15 1.2 100 No  -  uMAX/10
MAX5037  Step-Down 4.75 28 1  -  Yes 1.1 1.85 60 6 250
500 		No  -  MQFP/44
THIN QFN/44
MAX5038  Step-Down 4.75 28 1 1.2
1.5
1.8
2.5
3.3 		No  -   -  60 10 250
500 		No  -  SSOP/28
MAX5041  Step-Down 4.75 28 1  -  No 1 3.3 60 10 250
500 		No  -  SSOP/28
MAX1953  Step-Down 3 5.5 1  -  No 0.8 4.5 4 1 1000 No  -  uMAX/10
MAX1954  Step-Down 3 13.2 1  -  No 0.8 4.5 25 1 300 No  -  uMAX/10
MAX1957  Step-Down 3 5.5 1  -  No 0.4 4.5 3 1 300 No  -  uMAX/10
MAX1917  Step-Down 4.5 22 1  -  No 0.4 5 25 0.8 200
300
400
550 		No  -  QSOP/16
MAX5060  Step-Down 4.75 28 1  -  No 0.6 5.5 30 5.5 1500 No Automotive - General THIN QFN/28
THIN QFN/32
MAX5061  Step-Down 4.75 28 1  -  No 0.6 5.5 30 5.5 1500 No Automotive - General TSSOP/16
MAX5067  Step-Down 4.75 28 1  -  No 0.6 3.3 60 10 250
500 		No Automotive - General THIN QFN/44
MAX15023  Step-Down 4.5 28 2  -  No 0.6 23 15 6 1000 No  -  THIN QFN/24
MAX15034  Step-Down 4.75 28 1
2 		 -  No 0.61 5.5 50 17 1000 No  -  TSSOP/28
See All Switch-Mode DC-DC Power Supplies (429)

Key Specifications:   Voltage References
Part Number Output Voltage (V) Tempco (max) (ppm/°C) Initial Accuracy (% max @ +25°C) Supply Current - Series Only (max) (µA) Supply Voltage - Series Only (min) (V) Supply Voltage - Series Only (max) (V) Noise 0.1Hz to 10Hz (µVp-p typ) Features Package Operating Temp. Range (°C)
DS4305  Programmable 24 0.03 2,000 4 5.5 160
•Series
 SOT-23/5
SOT23/3 		-40 to +125
DS4303  Programmable 30 0.03 1,600 2.4 3.6 200
•Series
 SOT-23/5 -40 to +85
See All Voltage References (159)


         


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