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Solutions Search - Buck Regulator Plus LDO

Low Noise Power Supplies Come in Many Flavors: Part 3 - Buck Converters

Kevin B. Scott - Senior Strategic Marketing Engineer
Tim Sourdif - Senior Design Engineer
Mar 23rd 2017
In Part 1 of the series, we looked at linear regulators for lowest output noise performance. In Part 2, charge pump solutions with integrated post linear regulators we highlighted. In these previous examples, circuit efficiency was a lower priority. But what if low output voltage noise and high efficiency are both desired? ...

Blog Post 

 

DC2243A - LT3668EMSE DLT3668EMSE Demo Board | Buck Plus Dual Post-Regulator LDOs, 7V ≤ VIN ≤ 40V; VOUT1 = 6V @ 0.4A, VOUT2 = 5V @ 0.2A, VOUT3 = 5V @ 0.2Aemo Board | 7V ≤ VIN ≤ 40V; VOUT1 = 6V @ 0.4A, VOUT2 = 5V @ 0.2A, VOUT3 = 5V @ 0.2A

Mar 30th 2015
Demonstration circuit 2243A is a triple power supply that includes one 400mA step-down regulator and two 200mA low dropout (LDO) linear tracking regulators featuring the LT®3668. The demo circuit is designed for one 6V and dual 5V outputs from a 7V to 40V input. Two LDO outputs are configured as post-regulators of the switching ...

Demo Board 

 

40V, 400mA(IOUT), 2.2MHz Step-Down Regulator with Dual Tracking LDOs

Oct 20th 2014
MILPITAS, CA - October 20, 2014 - Linear Technology Corporation announces the LT3668, a 400mA, 40V step-down switching regulator with dual tracking LDO outputs packaged in an MSOP-16E. The LT3668 offers a complete, robust power solution for applications that require the power supply of a sensor to tightly track the power supply ...

Press Release 

 

LT3668 5V/0.75A Supply with Two 0.2A Tracking Outputs

Oct 15th 2014
The LT®3668 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear tracking regulators (LDOs).This provides a complete and robust power solution for applications that require the power supply of a sensor to tightly track the power supply of a measurement ASIC. ...

Circuit 

 

DC1869A - LT3667 Demo Board | Buck Plus Dual Fault-Protected LDOs, 6V ≤ VIN ≤40V, Vout1 = 5V, Vout2/Vout3 = 3.3V/2.5V @ 200mA

Sep 8th 2014
Demonstration circuit 1869A is a triple power supply including one 400mA step-down regulator and two 200mA low dropout linear regulators (LDOs) featuring the LT®3667. The demo circuit is designed for 5.0V, 3.3V and 2.5V outputs from a 6V to 40V input. Two LDO outputs are configured as post-regulators of the switching regulator ...

Demo Board LTspice 

 

40V, 400mA (IOUT), 2.2MHz Triple Output Step-Down DC/DC Converter with 60V Transient Protection

Apr 1st 2014
MILPITAS, CA - April 1, 2014 - Linear Technology Corporation announces the LT3667, a 400mA, 40V step-down switching regulator with dual LDO outputs packaged in a 3mm x 5mm QFN or MSOP-16E. The LT3667 offers a highly compact, triple output solution for automotive and industrial applications. The LT3667 operates from a VIN range ...

Press Release 

 

LT3667 Dual 5V/200mA Step-Down Converter

Feb 3rd 2014
The LT®3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). ...

Circuit 

 

LT3667 Pulsed Power Supply for 4mA to 20mA Current Loops

Feb 3rd 2014
The LT®3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). ...

Circuit 

 

LT3667 40Vin to 5V, 3.3V and 2.5V Step-Down Converter

Feb 3rd 2014
The LT®3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). ...

Circuit LTspice 

 

LT3667 5V, 3.3V and 2.5V Step-Down Converter with 100mA LDO Current Limits

Feb 3rd 2014
The LT®3667 is a monolithic triple power supply composed of a 400mA buck switching regulator and two 200mA low dropout linear regulators (LDOs). ...

Circuit LTspice 

 

36VIN μModule Regulator with Configurable Array of Five Low Noise 1A Linear Regulators for Multirail Logic Devices

Mar 12th 2013
MILPITAS, CA – March 12, 2013 – Linear Technology Corporation introduces the LTM8001, a step-down µModule® (micromodule) regulator consisting of an array of five low noise 1A linear regulators. The linear regulators are also configurable to deliver 2A, 3A, 4A or 5A, depending on the number and combination of current shared outputs. ...

Press Release 

 

DC1818A - LTM8001EY Demo Board | 5A Buck uModule Regulator, 6V ≤ VIN ≤ 36V, VOUT = Up to 5-Output Configurable LDO Array

Feb 14th 2013
Demo circuit 1818A features the LTM8001 μModule regulator that includes a 5A switching regulator and an array of five 1.1A low noise LDOs. The demo board operates from a 6V to 36V input and is configured so the switching regulator provides an output that also powers the LDOs. The LDOs in turn provide three outputs – ...

Demo Board 

 

DC1754A - LTC3104EDE Demo Board | 2.5V to 15V input, 3.3V at 300mA (Buck) and 1.8V at 10mA (LDO)

Jan 25th 2012
Demonstration Circuit 1754A features the LTC®3104, a high efficiency, monolithic synchronous step-down converter using a current mode architecture capable of supplying 300mA of output current. The IC operates with a fixed frequency oscillator at 1.2MHz. The LTC3104 also incorporates a programmable LDO which can be operated ...

Demo Board 

 

15V, 300mA Synchronous Buck Converters with Only 1.8μA Quiescent Current

Nov 28th 2011
MILPITAS, CA – November 28, 2011 – Linear Technology announces the LTC3103 and the LTC3104, 15V, fixed frequency synchronous buck converters capable of delivering 300mA of continuous current to output voltages from 0.6V to 13.8V. The LTC3103 consumes just 1.8µA of quiescent current, while the LTC3104 (which offers a 10mA ...

Press Release 

 

DC1781A - LT3507AEFE Demo Board | 7V to 36VIN, VOUT1 =1.8V @ 2.7A, VOUT2 =3.3V @1.5A, VOUT3 = 5.0V @1.8A, VOUT4 =2.5V @ 0.3A

Sep 26th 2011
Demo circuit 1781A is a Triple Monolithic Step-Down Regulator with LDO featuring the LT3507A. The demo circuit is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a 7V to 36V input. The current capability of each channel is 2.7A, 1.5A, 1.8A and 0.3A respectively. Independent input voltage, feedback, soft-start and power good ...

Demo Board LTspice 

 

DC1428A - LT3645EMSE Demo Board | VIN = 5V to 36V, VOUT1 = 3.3V @ 300mA, VOUT2= 2.5V @ 200mA

Jun 14th 2011
Demonstration circuit 1428A features the dual output LT®3645 step-down regulator plus linear regulator. The circuit is designed to convert a 5V to 36V (55V transients) input source to 3.3V at 500mA using the buck regulator and this output is linear regulated down to provide 2.5V at 200mA. Thus the two outputs provide 300mA ...

Demo Board LTspice 

 

36V, with 55V Transient Protection, 500mA(IOUT), Step-Down DC/DC Converter with Integrated LDO

May 12th 2011
MILPITAS, CA – May 12, 2011 – Linear Technology Corporation announces the LT3645, a 500mA (IOUT), 36V step-down switching regulator and integrated LDO packaged in a 3mm x 3mm QFN or MSOP-12E. The LT3645 operates from a VIN range of 3.6V to 36V with transient protection to 55V, making it ideal for load dump and cold-crank ...

Press Release 

 

DC1161B - LT3507EUHF Demo Board | 7V to 36VIN, VOUT1 =1.8V @ 2.4A, VOUT2 =3.3V @1.3A, VOUT3 = 5.0V @1.4A, VOUT4 =2.5V @ 0.2A

May 10th 2011
Demo circuit 1161B is a triple monolithic step-down regulator with LDO featuring LT®3507. The demo circuit is designed for 1.8V, 3.3V, 5.0V and 2.5V outputs from a 7V to 36V input. The current capability of each channel is 2.4A, 1.3A, 1.4A and 0.2A respectively. Independent input voltage, feedback, soft-start and power good ...

Demo Board LTspice 

 

DC1541A-A - LT3694EFE Demo Board | Triple Output, 4.5V ≤ VIN ≤ 36V (70V Transients), VOUT1 = 3.3V@1.7A (Buck), VOUT2 = 2.5V@450mA (LDO), VOUT3=1.8V@450mA(LDO)

Mar 18th 2011
Demonstration circuit 1541A-A is an adjustable output voltage, 2.6A output current Monolithic Buck Regulator with dual LDO regulators featuring the LT3694. The buck regulator is capable of generating up to 2.6A at its output and the two LDO regulators (which are powered from the buck output) are capable of providing 450mA each. ...

Demo Board LTspice 

 

36V, with 70V Transient Protection, 2.6A(IOUT), 2.5MHz Step-Down DC/DC Converter with Dual Linear Controllers

Nov 18th 2010
MILPITAS, CA - November 18, 2010 - Linear Technology Corporation announces the LT3694, a 2.6A, 36V step-down switching regulator with dual linear controllers, packaged in a 4mm x 5mm QFN or TSSOP-20E. The LT3694 operates from a VIN range of 4V to 36V with transient protection to 70V, making it ideal for load dump and cold-crank ...

Press Release 

 

36V, 1.5A Buck and 1.5A Boost 2MHz Step-Down DC/DC Converters & LDO Controller in 4mm x 4mm QFN

Dec 3rd 2008
MILPITAS, CA - December 3, 2008 - Linear Technology Corporation announces the LT3570, a 36V, 1.5A(ISW) buck and boost regulator combined with a linear controller packaged in a 4mm x 4mm QFN or TSSOP-20E. The LT3570 operates from a VIN range of 2.5V to 36V (40VMAX), making it ideal for the load dump and cold-crank conditions ...

Press Release 

 

DC1106A - LT3570EUF Demo Board | Buck + Boost + LDO Controller, 4V to 36Vin Buck with Vout1 = 3.3V@1A, 3.3V to 10Vin Boost with Vout2 = 12V@275mA, 100mA LDO

Oct 8th 2008
Demonstration circuit 1106 is a 1.5A Buck Converter, 1.5A Boost Converter, and LDO Controller featuring the LT3570. The Buck is designed to convert a 4V to 36V source to 3.3V at 1A. The LDO is powered from the output of the buck and converts 3.3V to 2.5V at 100mA. The boost converts a 3.3V to 10V source to 12V at 275mA. ...

Demo Board LTspice 

 

Synchronous 700mA (ISW) Boost & 250mA (IOUT) Buck Regulators & 100mA LDO in a 3mm x 3mm QFN

May 22nd 2008
MILPITAS, CA - May 22, 2008 - Linear Technology Corporation announces the LTC3100, a triple output converter which includes a 700mA (ISW) synchronous boost regulator, a 250mA (IOUT) synchronous buck regulator and a 100mA (IOUT) LDO in a 3mm x 3mm QFN-16 package. Both the boost and the buck regulators switch at 1.5MHz and use ...

Press Release 

 

DC1326A - LTC3100EUD Demo Board | 1.5MHz Synchronous Dual Channel DC/DC Converter and 100mA LDO

May 8th 2008
Demonstration circuit 1326A consists of three voltage regulators; a synchronous boost, a synchronous buck and a linear LDO. Jumpers are provided for selecting a total of nine output voltages (3 boost output voltages: 1.8V/3.3V/5V, 3 buck output voltages: 1.2V/1.5V/1.8V, and 3 LDO output voltages: 1.5V/2.85V/3V). The high efficiency ...

Demo Board LTspice 

 

2.5MHz, 36V Triple Step-Down DC/DC Converter with LDO Controller

Apr 24th 2008
MILPITAS, CA - April 24, 2008 - Linear Technology announces the LT3507, a triple channel current mode PWM step-down DC/DC converter with three internal 36V power switches and an LDO controller, all packaged in a 38-lead 5mm x 7mm QFN package. One channel is capable of delivering up to 2.4A of output current while the other two switching ...

Press Release 

 

400mA, 2.25MHz Synchronous Step-Down DC/DC Converter with Dual 150mA LDOs in a 2mm x 3mm DFN

Mar 13th 2008
MILPITAS, CA - March 13, 2008 - Linear Technology announces the LTC3670, a 400mA, 2.25MHz, synchronous buck regulator and two 150mA LDOs packaged in a 2mm x 3mm DFN. The LTC3670’s switching regulator and both LDOs are adjustable down to 0.8V, offering a very compact triple output converter for handheld applications. Its input voltage ...

Press Release 

 

25V, 2A(IOUT), 2.2MHz Step-Down DC/DC Converter with Linear Controller in 3mm x 3mm DFN

Feb 7th 2008
MILPITAS, CA – February 7, 2008 – Linear Technology announces the LT1939, a 2A, 25V step-down switching regulator and a linear controller in a 3mm x 3mm DFN package. The LT1939 operates from a VIN range of 3V to 25V, making it suitable for regulating power from a wide variety of sources, including protected automotive batteries, ...

Press Release 

 

DC1277A - LTC3670EDDB Demo Board | 2.25MHz, Buck Plus Two 150mA LDOs, 2.5V ≤ VIN ≤ 5.5V, Vout1 = 1.2V @ 400mA, Vout2 = 2.8V @ 150mA, Vout3 = 3.3V @ 150mA

Jan 23rd 2008
Demo Circuit 1277A is a demo board that features the LTC®3670, a triple power supply composed of a 400mA synchronous buck regulator and two 150mA low dropout linear regulators (LDOs). The input supply range is 2.5V to 5.5V and it provides 1.2V @ 400mA, 2.8V @ 150mA and 3.3V @ 150mA. The output regulation of the LDOs is subject ...

Demo Board 

 

DC1293A - LT1939EDD | Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller

Jan 8th 2008
DC1293A - Demo Board for:LT1939 - Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller ...

Demo Board LTspice 

 

36V, 2A(IOUT), 2.2MHz Step-Down DC/DC Converter with Linear Controller in 3mm x 3mm DFN

Oct 23rd 2007
MILPITAS, CA – October 23, 2007 – Linear Technology announces the LT3500, a 2A, 36V step-down switching regulator and a linear controller in a 3mm x 3mm DFN package. The LT3500 operates from a VIN range of 3V to 36V (40VMAX), making it ideal for load dump and cold-crank conditions found in automotive applications. Its 2.3A internal ...

Press Release 

 

DC1069A - LT3500EDD| 36V (40V Transient), 2.2MHz Step-Down Switching Regulator

Oct 12th 2007
Demo circuit 1069A is a monolithic step-down switching regulator with LDO featuring LT3500. The demo circuit is designed for 5.0V and 3.3V outputs from a 6V to 36V input. The LDO output is configured as a postregulator of the switching regulator output. The total current capability is up to 2A. The switching regulator can be ...

Demo Board LTspice 

 

400mA, 2.25MHz Synchronous Step-Down DC/DC Converter with Dual 150mA LDOs in a 2mm x 2mm DFN

Sep 5th 2007
MILPITAS, CA - September 5, 2007 - Linear Technology announces the LTC3672B-1 and LTC3672B-2. Both parts have a 400mA, 2.25 MHz, synchronous buck regulator and two 150mA LDOs packaged in a 2m x 2mm DFN. The LTC3672B-1 has a fixed 1.8V output on the switching regulator and fixed 1.2V and 2.8V outputs for the LDOs, whereas the LTC3672B-2 ...

Press Release 

 

DC1324A - LTC3672BEDC-2 | Synch 400mA, 2.25MHz Step-Down DC/DC Reg w/ Dual 150mA LDOs

Jul 30th 2007
DC1324A - Demo Board for:LTC3672B-2 - Monolithic Fixed-Output 400mA Buck Regulator with Dual 150mA LDOs in 2mm x 2mm DFN ...

Demo Board 

 

DC970A-B - LTC3541-1 Demo Board | 3V ≤ VIN ≤ 5.5V, Vout1 (Buck) = 1.8V or 2.5V @ 500mA, Vout2 (VLDO) = 0.8V/1.2V/1.5V/1.8V @ 300mA

Feb 13th 2007
Demonstration circuit DC970A-A and DC970A-B feature the LTC3541 and LTC3541-1 respectfully, and provide a high efficiency, synchronous buck plus VLDO linear regulator. For the LTC3541, the buck regulator powers up before the linear regular, and for the LTC3541-1, the linear regulator powers up first. The DC970A has an input ...

Demo Board LTspice 

 

DC970A-A - LTC3541 Demo Board | 3V ≤ VIN ≤ 5.5V, Vout1 (Buck) = 1.8V or 2.5V @ 500mA, Vout2 (VLDO) = 0.8V/1.2V/1.5V/1.8V @ 300mA

Feb 13th 2007
Demonstration circuit DC970A-A and DC970A-B feature the LTC3541 and LTC3541-1 respectfully, and provide a high efficiency, synchronous buck plus VLDO linear regulator. For the LTC3541, the buck regulator powers up before the linear regular, and for the LTC3541-1, the linear regulator powers up first. The DC970A has an input ...

Demo Board LTspice 

 

500mA, 2.25MHz Synchronous Step-Down DC/DC Converter with a 300mA VLDO Regulator

Jan 24th 2007
MILPITAS, CA - January 24, 2007 - Linear Technology announces the LTC3541, a 500mA high efficiency, 2.25 MHz, synchronous buck regulator and a 300mA VLDO™ in a single package. The LTC3541 provides two high efficiency voltage rails from a single input requiring only a single inductor. The synchronous buck regulator delivers ...

Press Release 

 

DC893A - LTC3446EDE Demo Board | 2.9V ≤ VIN ≤ 5.5V, Vout1 = 1.8V @ 400mA, Vout2/Vout3 = 1.2V/1.5V @ 300mA

Sep 12th 2006
Demonstration circuit 893A is a triple output converter using the LTC3446 1A monolithic synchronous buck regulator with dual 300mA very low drop-out linear regulators (VLDOs). The DC893A has an input voltage range of 2.9V to 5.5V, and is capable of delivering up to 400mA of load current on the buck output and up to 300mA on ...

Demo Board 

 

1A Step-Down DC/DC Converter Plus Two 300mA VLDO Regulators in a 3mm x 4mm DFN

Aug 30th 2006
MILPITAS, CA - August 30, 2006 - Linear Technology Corporation announces the LTC3446, a 1A, 2.25 MHz, synchronous buck regulator with two 300mA VLDOs in a single monolithic IC. The input voltage range of 2.5V to 5.5V makes this triple output regulator ideal for single cell Li-Ion/Polymer, or multicell alkaline/NiCad/NiMH powered ...

Press Release 

 

DC698A - LTC3445EUF Demo Board | I2C-Controllable Buck Plus Dual LDO & PowerPath, 2.5V ≤ VIN ≤ 5.5V, Vout1 = 0.85 to 1.55 @ 0.6A, Vout2 = 1.3V @ 50mA, Vout3 = 1.1V @ 50mA

Dec 6th 2004
Demonstration Circuit 698 is an I2C-controlled high efficiency 600mA synchronous current mode buck regulator and two 50mA linear regulators featuring the LTC®3445. The LTC3445 also features backup/main battery power path selection. The input voltage range is 2.5V to 5.5V. The buck regulator has a programmable output range ...

Demo Board 

 

DC463A - LTC3700EMS | Step-Down Regulator With LDO, 5 - 9Vin1, 3.3Vout1 @ 1A, Jmpr Sel. 3.3 - 5Vin2, 2.5Vout2 @ 150mA

May 21st 2002
DC463A - Demo Board for:LTC3700 - Constant Frequency Step-Down DC/DC Controller with LDO Regulator ...

Demo Board 

 

DC357A-A - LTC1704EGN | 550kHz Synchronous Buck, Burst Mode With Linear Regulator

Apr 1st 2002
DC357A-A - Demo Board for:LTC1704 - 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller ...

Demo Board 

 

DC357A-B - LTC1704BEGN | 550kHz Synchronous Buck With Linear Regulator

Apr 1st 2002
DC357A-B - Demo Board for:LTC1704 - 550kHz Synchronous Switching Regulator Controller Plus Linear Regulator Controller ...

Demo Board