Wide Vin DC/DC Converters: Reliable Power for Demanding Applications

Wide Vin DC/DC Converters: Reliable

Power for Demanding Applications

This webinar will be available afterwards at www.designworldonline.com & email

Q&A at the end of the presentation

Hashtag for this webinar: #DWwebinar

Before We Start

http://www.designworldonline.com/

Moderator Presenter

Mary GannonDesign World

Jim MacDonald

Texas Instruments

Wide Vin DC/DC Converters

Reliable Power Solutions for Demanding Applications

• Wide Vin DC/DC converter overview• Wide Vin power for Industrial systems• Wide Vin power for Automotive

systems• Wide Vin power for Communications

systems• Additional Wide Vin resources

Agenda

TI’s Wide Vin DC/DC Converter ProductsReliable Power Solutions for Demanding Applications

Applications Power Challenges ProductsIndustrial12V, 24V & higher Bus Voltages

Automotive & Transportation12V/24V off-battery systems

Communications24V/48V battery-backed systems

Multiple Input Sources

Varying Input Voltages

Large transients and/or noisy & harsh conditions

Boost and Buck-boost Controllers and Regulators

Buck Controllers & Regulators

Integrated Power Modules

Vin (V)

100V

80V

60V

40V

20V

CommercialAuto

ConsumerAuto

Mass Transit(Busses, Trains)

Avionics & Defense

FactoryAutomation

BTSRepeaters

Base Stations

Networking& Storage

Automotive Industrial Comms & Cloud

10V12V

24V 24V28V

24V 24V

48V 48V

Nominal bus voltageBus operating rangePotential transient rangeAuto start-stop range4-20mA loop range

Wide Vin Benefit:Optimized for Use Across Multiple Markets and Applications

Wide Vin Benefit:High Voltage Rating Eliminates Protection Circuits & Saves PCB Area

VIN

DC/DCVIN_BAT

RTN

VIN

DC/DCVIN_BAT

RTN

VIN

Wide VinDC/DC

VIN_BAT

RTN

Transient Absorbers Disconnect FET Wide Vin DC-DC

Pro:• Does not interrupt dc/dc power during

OV transients

Pro:• Not dissipative OV protection. Can

survive for longer duration OV conditions.

Pro:• Automatic OV protection up to 65V/75V• Operation not interrupted in OV condition• No extra design work required.

Cons:• Selection can be complicated;

Dependent on energy (Volt/time)• Dissipates energy (bigger size)• Longer duration OV (e.g. ISO 7637

Pulse 5b) conditions not taken care of in reasonable size/cost

Cons:• Needs multiple components including a

disconnect FET. • Creates voltage drop (power dissipation)

in normal operation. • PMOS tends to be bigger. NMOS needs

charge pump. • Interrupts power flow during OV

Cons:• May exhibit slightly lower efficiency when

operating from lower input voltages such as 3.3V and 5V

Wide Vin Power for Industrial Systems

Challenge #1: Designing a Reliable & Low Cost System Bias Supply

System Bias

Supply

Digital Isolator

• The system bias rail(s) must be derived from the system backplane, which is typically 24V but can experience transients of 40V or higher

• Isolation is often required for noise immunity or safety• The use of opto-isolators is often avoided due to reliability

Industrial Automation Equipment

System Need: Application Challenges:• Most systems require a low current bias

supply for the micro-controller and/or FPGA to initiate system start-up correctly each time

Wide Vin Bias Supply System Examples

36-75Vin Vout

LM5112LM5017

9VPRI 9VSEC

Digital Controller

UCD3138

LM5101

LM5017 Flybuck SW1

SW1M

DR_HS

DR_LS

-VEE

+VCC

-VEE

+VCC

Vin

Isolated bias supply for DC/DC power modules

Isolated bias supply for IGBT-based AC motor drives

Multi-output bias supply for PLC I/O modules

LM5017/8/9 Fly-buck™ Bias Supply ICs

+

+

+

+

VI

N

BST

RON

RTN

SW

VCC

FBUVLO

VIN

VOUT1

VOUT2

RFB1RUV1

RON

COUT1

CBST

D1

CIN

COUT2

RFB2

RUV2

X1

Rr

NP

NSLM5017

CVCC+

D2

LM5017 Feature System Benefits

7.5V to 100V operating range Works with all major bus voltages

Integrated synchronous FETs High efficiency, fewer components

Constant on-time (COT) architecture

No loop compensation needed

100/300/600mA current rating Addresses bias needs up to ~6W

Switching frequency up to 1MHz

Reduces PCB footprint

Ultra-fast transient response Fewer output capacitors needed

Isolated bias w/ no opto-isolator

Higher reliability, fewer components

+

+

+

VINBST

RON

RTN

SW

VCC

FB

VINVOUT

RFB1

Rr

RUV1

RON

COUT

CBST

CIN

RFB2

RUV2

L

UVLO

+

CVCC

LM5017

Input Voltage (V)

Ma

x O

utp

ut

Cu

rre

nt

(mA

)

10048

LM5017LM25017

LM5018LM25018

LM5019LM25019

7.5

100

300

600

Synchronous Buck CircuitSmall & efficient bias supply from a 24V or 48V input bus

Isolated Fly-buck CircuitIdeal for isolated and multi-output bias supplies; no opto needed!

Fly-buck Isolated Bias Supply Basics

Flybuck Buck

+

-Vin

Vout

Vin

Vpri

Vsec

1

N

• The Fly-buck converter is evolved from a synchronous buck converter by adding coupled windings to the inductor to have flyback-like isolated outputs.

• The isolated outputs can be multiple by adding more secondary windings to the transformer

• A simple and low part count solution for multi-output/isolated power supply design

Flybuck Flyback

OutputsMultiple isolated and one non-isolated

Isolated outputs can be negativeSame capabilities

Input Range Vin-min must be > primary output Vin-min smaller or larger than Vout

Size Smaller solution, smaller transformer

Cost Fewer component count, lower cost

Transformer 2-winding transformer 3-winding transformer larger and more expensive

FET Switch Stress Vin Vin + Vout/N

Performance Good regulation achievable, 5% on both primary and secondary outputs

Similar regulation through tertiary winding.

High output accuracy using opto, but large deviation under light load condition

Fly-buck vs. Flyback Solution Comparison: Summary

• The Fly-buck can provide a simple, small and cost effective power solution making it a suitable flyback alternative

• The Fly-buck can provide a simple, small and cost effective power solution making it suitable as a flyback alternative (typically)

• A Fly-buck vs. Flyback Comparison:o Spec: Nominal Vin=24V, Vo1=12V, Vo2=-12V, 250mA max load on each output

Fly-buck 1:1 single secondary

winding transformer Primary side regulation Primary: 12V, non-

isolated Secondary: -12V,

isolated

Flyback 1:1:1 two secondary

windings transformer Secondary side

regulation through opto-coupler

Secondary: +/-12V, isolated

Fly-buck vs. Flyback Solution Comparison: Case Study

Fly-buck vs. Flyback Solution Comparison: PCB Design

LM5017 Flybuck Component Count 23 Effective Area 1.4x1.2 inch Max height: 8mm

LM5000 Flyback Component Count 45 Effective Area 1.8x1.8 inch Max height: 10mm

Fly-buck offers a smaller solution size vs. Flyback

Fly-buck uses fewer components than the Flyback, and no opto-isolator is needed.

Effective Area

Effective Area

Fly-buck vs. Flyback Solution Comparison: Performance

LM5017 Flybuck

0.000 0.050 0.100 0.150 0.200 0.25010.20010.40010.60010.80011.00011.20011.40011.60011.80012.000

Vo1-Vo2

Io1=Io2 (A)

Vo (V

)

Vo2 has an additional diode drop, and the delta grows bigger at higher load

4%Δ

0.000 0.050 0.100 0.150 0.200 0.25011.500

11.600

11.700

11.800

11.900

12.000

12.100

Vo1-Vo2

Io1=Io2 (A)

Vo (V

)

LM5000 Flyback

Vo2 is lower at light load, but it can be improved by adding pre-load

0.000 0.050 0.100 0.150 0.200 0.25070.0%

75.0%

80.0%

85.0%

90.0%

73.3%

81.5%84.5%

86.2% 87.1%

78.1%

83.8%86.4% 87.7% 87.9%

FlybuckFlyback

Io1=Io2 (A)

Efficie

ncy

+2%

Vo1 and Vo2 are equally loaded from 0A to 250mA

Flybuck can achieve +/-5% accuracy under balanced load, and has slightly higher efficiency than Flyback

Challenge #2: Designing a Boost Supply with Overload Protection

Traditional boost solutions: • Require fuse and/or hotswap

controllers to protect against inrush or over-current faults

• Fuses require system service after a fault

• Interaction between ICs must be considered

Hot swap controller

Boost controller Load

Optionalfuse

SUPPLY

Boost controller w/ disconnect switch Load

Boost with Disconnect Switch:• Limits inrush current during start-up and

overloads• Eliminates the need for hot swap

controllers• Disconnects the load during catastrophic

faults• Avoids unnecessary fuse replacements• Reduces system cost & footprint

System Need: Application Challenges:

SUPPLY

• Ability to power motors without reducing system reliability

• Boost converters inherently have no overload or short-circuit protection (current can flow from input to output

System Examples Where Load Disconnect is Needed

DC/DCLM5121

24V@2A12V

Supply Print Motor

Point-of-sale systems Currency handler

Industrial injection molding machine

LM5121 Synchronous Boost Controller with Disconnect Switch

VCC

LM5121

CSN

DG

SYNCIN/RT

RES

SSUVLO

VIN

AGND

BST

MODE

PGNDSLOPE

COMP

FB

HO

LO

SW

+

DS

VOUTVSUPPLY

CSP

DisconnectSwitch


Wide input voltage range: 4.5V to 65V Output voltage: adjustable up to 100V

Supports high voltage input and output with no external protection circuitry needed

Synchronous operation High efficiency, bypass operation (Vout = Vin)

Load disconnect FET Input to output isolation during shutdown

Inrush current limit Avoid unnecessary input fuse replacements

Hiccup mode over-current protection

Protects against temporary over-load faults

Circuit breaker function Disconnects catastrophic faults from input

VOUTVIN

The disconnect FET enabled a back-to-back MOSFET connection that isolates the load from the source during output fault conditions and eliminates the need for a fuse

LM5121 Eval Board with input disconnect FET

+ -

CS AMP

A=10

RS

Circuit BreakerComparator

1.6V/0.11V

+-

LM5121

+

VIN

CSP CSN DG DS

DisconnectSwitch

SenseResistor

• If the voltage across the sense resistor exceeds the circuit breaker threshold (~160mV), the internal comparator and FET will quickly turn off the external disconnect FET

• When the sense resistor voltage drops below circuit breaker disable threshold (~10mV), the disconnect FET is turned on again

Circuit Breaker FunctionProtects against output short-circuits and other catastrophic faults

How does it work?

Challenge #3: Achieving High Power Density and Low EMI

System Need: Application Challenges:• High density power circuits

that free up valuable PCB real estate for critical system functions

• Discrete power ICs require multiple external components and can be complex to design & debug

• Integrated DC/DC converter modules can be difficult to manufacture (hidden connections are difficult to inspect)

• Power circuits (in general) generate EMI that can degrade performance of sensitive system signals

LGA Power Modules• Can be difficult to

manufacture (hard to inspect all connections)

Discrete DC/DC Converter• More complex design/layout

Many systems have minimal PCB area left for the power circuits

LMZ1/2 Power Modules: High Performance and Easy to Design

1A 2A 3A 4A 5A

Current

8A 10A

LMZ10504 (≈42oC case)

Competitors (≈46oC case)

Operating Conditions: VIN=5.0V, VOUT=1.8V, IOUT= 4A

LMZ136106-36Vin, 10ADemo board

Fully WEBENCH® enabled for easy designSimulation, thermal analysis, and

Easy-to-use leaded packages• Single exposed pad with IC leads• Easy prototyping and manufacturing

High PCB DensityAs few as 5 external components

Low Radiated EMIMeets EN55022 Class B

Best-in-class Thermal Performance No airflow or heat sink required

Wide Vin Power for Automotive Systems

Challenge #1: Handling the Automotive Battery RangeCompliance to load dump and cold cranking requires a wide input range

40V for 12V batteries60V for 24V battery

As low as 3V

Automotive battery voltage transients

12V Lead Acid Battery Application Challenges

• Battery voltage varies due to engine cranking, load dump, jump starts, and accidental reverse battery connection– Cold crank voltage < 5V– Load dumps cause 40V transients– 24V commercial vehicle load dump

transients can exceed 60V

Wide Vin power management ICs can increase reliability and reduce system cost

Wide Vin Power Solutions for Automotive

ProtectionBattery

conditioning

Buck converters

PMU

Typ 8V, 5V or 3.3VWide Vin

converters & controllers

Voltage reference

Boost

3V-42VE.g. 10V minboost output

Optional reverse polarity or over-voltage/current protection

Boost or buck-boost needed if output voltage level must be maintained during cranking

Wide Vin buck converter is needed here to survive battery voltage transients

Battery:12 or 24V

Standard Vin

<28V

Wide Vin required

≥28V

LDOs

Challenge #2: Dealing with Start-stop

• Automotive manufacturers will add Idle start-stop (ISS) capability to increase fuel efficiency

• ~15M vehicles will have ISS by 2015

Market Need: Application Challenges:• A start-stop event could push the battery

voltage as low as 3V (similar to a warm crank condition)

• Vehicles must maintain a stable ~12V output to ensure normal AVN operation despite voltage drops

• Must be scalable to address different system needs; <100W for sub-systems up to ≥400W for a centralized voltage stabilizer system for the whole vehicle

• Small form factor: must not add significant size or weight to the vehicle or sub-system

Voltage Stabilizer

Boost

3V-42VE.g. 10V minboost output

12V Battery

To power system or

sub-system

LM5122: Stackable Synchronous Boost Controller

MASTER

VCCCSN

SYNCIN/RT

RES

SS

UVLO

VIN

SYNCOUT

BST

SLOPE

COMPFB

HO

LO

SW

+

VOUT

VCCCSN

SYNCIN/RT

RES

SS

UVLO

VIN

BST

SLOPECOMP

FB

HO

LO

SW

VCC

SLAVE

VSUPPLY

VSUPPLY

CSP

CSP

OPT

OPT


Wide Vin range: 4.5V to 65V (3V after start-up)

Handles load dump and start-stop voltage range

Synchronous operation High efficiency, bypass operation (Vout = Vin)

Stackable w/ current sharing

Scales easily from 1-phase to 8+ phases

100% duty cycle bypass mode

Low dropout when not boosting battery voltage

Low shutdown current: 9uA

Low battery drain when not operating

LM5122EV-1PH: 1-phase design for ≤100W

PMP7837: 4-phase ref design for 450W

Up to 98% Efficiency! Scalable from 1 to 4+ phases!

http://www.ti.com/tool/PMP7837

http://www.ti.com/tool/lm5122evm-1ph





Challenge #3: Fitting Wide Vin Power in Tight SpacesApplication example: rear-view camera module

• Total solution size must fit into tiny space

• Operates directly from battery; cold crank down to 4.5V and load-dump up to 42V

• High efficiency (low thermal dissipation)

• Does not interfere with radio frequency band

• Low EMI to avoid degrading video quality

The National Highway Traffic Safety Administration will require all vehicles to have a rear-view visibility system starting in May 2018

Market Need: Application Challenges:

Wide Vin Power Solution for Rear-view Cameras

DS90UB913A-Q1Serializer

LM34919C2.9V Buck Converter

TPS622311.8V Buck Converter

RC Filters

AptinaAR0132AT

Image Sensor

12bit Data & PixCLK, FV, LV

AptinaAP0101AT

Image Signal Processor (ISP)

10bit Data &

PixCLK, FV, LV

VDD, IOVDD, IO

VAA

VDD, IO

2.9V 1.8V

2.8V

12V

SMB Conn.

Coaxial Cable

Power

FPD-Link III

Serial Data

Power/Serializer Board Camera Board

Camera Board Front

Power/Serializer Front

Camera Board Front

http://www.ti.com/tool/PMP9300TI DESIGN: Schematic/BOM/Gerber On line

VIN

SW

BST

LM34919C

VCC

SS

RON

4.5V - 40VInput

C1 RON

R2

R1

C2

VOUTL1

C3

C4

D1

C6

RTN

ISEN

SGND

FB

PGD R3PGOOD

VDD

SHUTDOWN

Key Challenge LM34919CQ Benefits

Small package size

1.75x2mm uSMD package

Wide Vin range 4.5V to 50V input works from battery

Low part count Constant on time topology minimizes external components

No AM interference

2.6MHz switching frequency

Low EMI Meets CISPR 25 Class 5

~22mm

Ultra small package(1.75x2mm)



Wide Vin Power for Communications

Systems

Challenge #1: High Current Power From a 48V Bus

• Generally constant frequency is desired (for minimizing/managing switching noise)

• Potential for high step-down ratios (low duty cycles)

• Efficiency and complexity choices (1-stage vs. 2-stage conversion)

• Transient response (trying to minimize number of capacitors)

• Stability over all operating conditions

Creating a high current system supply from a high input voltage (36V or 48V)

System Need: Application Challenges:

48V

Buck DC/DC

Buck DC/DC

28V (PA #1)

24V(Antenna)

Isolated Power Module

12V (to uP board)

Buck DC/DC 5V/3.3V(Misc)

Selecting the Right Wide Vin Buck ControllerHigh Duty Cycle

Low Duty Cycle

More stableFast TransientsCurrent sharing

More flexible

Benefits:• Inherent feed-forward• Simpler loop compensation

Considerations/tradeoffs:• Can be noise sensitive• Not ideal for high Vin to low Vout

Benefits:• Inherent feed-forward• Simpler loop compensation• Eliminates leading edge “spike”

(excellent for high Vin to low Vout)

Considerations/tradeoffs:• Max frequency and duty cycle limits

Voltage Mode

Benefits:• Good regulation & noise margin• More “tunable” for specific needs

Considerations/tradeoffs:• Need feed-forward if Vin can change• Tougher to compensate loop• Current sharing needs extra circuitry

Top Parts:TPS40170TPS40200

Top Parts:TPS43340TPS43350

Current Mode

Constant On-time (or DCAP)

Benefits:• Easy to use (no loop compensation)• Fast transient response

Considerations/tradeoffs:• Not constant frequency• Not synchronizable• Requires ripple to regulate

Top Parts:LM3150LM5085

Emulated Current Mode

Top Parts:LM5116LM5117LM5119LM5008

TI’s Most Popular Wide-Vin Buck ControllersDevices for operation from <60V supply

Devices optimized for supplies up to 75V/100V

CSD18501Q5A SON5x6 40 20 2.5 3.2 155 42 5.9 8.1 70 725 Now NowCSD18503Q5A SON5x6 40 20 3.4 4.3 145 27 4.3 4.5 52 510 Now NowCSD18504Q5A SON5x6 40 20 5.3 6.6 75 16 2.4 3.2 39 310 Now NowCSD18540Q5B SON5x6 60 20 1.6 2.0 188 58 11.0 12.8 120 498 15-Feb 14Q2CSD18532Q5B SON5x6 60 20 2.5 3.2 169 44 6.9 10.0 111 470 Now Now

CSD18532NQ5B SON5x6 60 20 2.7 3.4 165 49 7.9 16.0 139 495 Now NowCSD18531Q5A SON5x6 60 20 3.5 4.6 134 36 5.9 6.9 100 380 Now NowCSD18533Q5A SON5x6 60 20 4.7 5.9 103 29 5.4 6.6 68 292 Now NowCSD18563Q5A SON5x6 60 20 6.0 7.5 98 29 5.4 6.6 57 292 Now NowCSD18534Q5A SON5x6 60 20 7.8 9.8 69 17 3.5 3.2 54 167 Now Now

CSD18537NQ5A SON5x6 60 20 11 14 55 14 2.3 4.7 54 136 Now NowCSD19502Q5B SON5x6 80 20 3.4 4.1 138 48 8.6 14 275 925 Now NowCSD19532Q5B SON5x6 100 20 4.0 4.9 130 48 8.7 13 249 706 Now NowCSD19531Q5A SON5x6 100 20 5.3 6.4 110 37 7.0 11 226 540 Now NowCSD19533Q5A SON5x6 100 20 7.8 9.4 75 27 4.9 7.9 163 395 Now NowCSD19534Q5A SON5x6 100 20 12.4 15.5 53 15 2.7 4.5 97 228 Now 10-Feb

60-100V NexFETs for Wide Vin Controller Applications

Ideal for 24V/36V buck designs up to 10A

High-side

Low-side

• Scalable from 40V to 100V• Industry-standard SON 5x6mm package• Ultra-low Qg and Qgd and low thermal resistance

Part Number PackageBVDSS

(V)VGS

(V)

RDS(ON)

Typ (10V)(mΩ)

RDS(ON)

Max (10V)(mΩ)

ID @ 25ºC (silicon)

Qg(10)Typ(nC)

QgdTyp(nC)

QgsTyp(nC)

Qrr - 300A/µs

Typ(nC)

CossTyp(pF)

Alpha Samples

RTM

CSD18509Q5B SON5x6 40 20 1.0 1.25 264 160 21.0 34.0 40 1100 30-Jan 14Q2

CSD18563Q5A

CSD18537NQ5A

Using a Wide Vin Controller with 60V NexFETsVIN: 24V/36VVOUT: 5VIOUT: 5ALOUT: 10µH (14mΩ)Freq: 100kHz

• >92% Peak Efficiency with 36VIN/5VOUT

• >93% Peak Efficiency with 24VIN/5VOUT

Challenge #2: Low Noise Power for Sensitive Signals

• VCOs, RF circuits, and data converters require low noise power supplies to reach their stated performance

System Need: Application Challenges:• DC/DC converters generate ripple that can

degrade the signal and/or reduce transmit/receive speed

• Linear regulators dissipate heat

0

10

20

30

40

50

60

70

80

10 100 1,000 10,000 100,000 1,000,000 10,000,000

PSRR

[dB]

Frequency [Hz]

DAC9881 PSRR vs 5V (analog supply) Input Spectrum

0.00

0.01

0.10

1.00

10.00

100.00

1000.00

10 100 1K 10K 100K 1M 10M

Freq (Hz)

uV

/ sq

rt(H

z)

If we used a DC/DC converter as the power supply, the ripple at higher frequencies could degrade system performance as they would not be properly filtered by the DAC alone.

For example, the PSRR on the DAC9881 is low at higher frequencies. That means that it has a limited ability to filter out any high frequency input ripple and prevent it from affecting bits.

Know What to Look For in a Linear Regulator

PSRR (in dB) denotes the LDO’s ability to reject noise from the input power supply. The higher the absolute value, the better the LDO can attenuate ripple from the input source, prohibiting it from affecting the output rail.

Output noise voltage (µVRMS) represents the noise generated from the LDO itself. The lower this value, the less impact the LDO will have on the integrity of the desired output rail.

Creating a low noise supply from >30V input

Filtering out power supply noise (ripple)

Preventing any noise from disrupting the signal

Best Used When…

• Low current needed• Don’t like switchers• Need small size/cost

• High current needed• Need high efficiency• Need low ripple

• Low to medium current• Radio signals involved

Key Specs to review

Output noise should not be too high

• Need high PSRR (at the switching frequency)

• Look for lowest output noise• Also want high PSRR over a

wide bandwidth

Don’t forget Every volt dropped through the regulator means efficiency loss

Try to minimize dropout to keep heat down

VIN

EN

NR/SS

VOUT

FB

GND

COUT

TPS7A30ON

OFF

CIN

VIN

EN

NR/SS

VOUT

FB

GND

TPS7A49ON

OFF

CIN

VIN

EN

NR/SS

PH

VSense

GND

TPS54060ON

OFF

COUTVIN - 18V – 30V

+18V

-18V

+12V

-12V

-18V Switcher@300kHz

+18V Switcher @ 300kHz

-12V LDO

+12V LDO

By virtue of high PSRR and low output noise density, TPS7A49 & TPS730 are able to filter out switching noise and provide clean positive and negative rails

Filtering Switching Power Supply Noise (Ripple)• For high current needs, the power dissipation of a linear regulator may

be too high• Combining a switching converter with a high PSRR linear regulator can

achieve an excellent balance of high efficiency and low noise

TPS7A40 LM2936HV TPS7A16 TPS709 TPS7A49 TPS7A30 TPS7A47 TPS7A33

IOUT (A) 0.05 0.05 0.1 0.15 0.15 0.2 1 1

VIN (V) 7-100 5.5-60 3-60 2.7-30 3-36 -3 to -36 3-36 -3 to -36

VOUT (V) 1.1-90 3-5 1.2-18.5 1.2-5 1.2-33 -1.18 to -33 1.4-34 -1.2 to -33

Output Noise 58uVrms 500uVrms - 190uVrms 12.7uVrms 14uVrms 4uVrms 16uVrms

PSRR @ 100kHz

65dB @ 100Hz

60dB @ 120Hz50dB @ 100Hz

52dB @ 1kHz

53dB 55dB 60dB 64dB

VOUT Accuracy (%)

2.5 +/-2 2 2 1.5 1 1

Dropout (mV) 780 @50mA

200 265mV @100mA

245 @50mA

260mV @100mA

215 @ 100mA

307 @ 1A 307 @ 1A

Package(bold: smallest)

8MSOP-PowerPAD

SOT-223, 8SOIC,

8VSSOP, TO-252

8MSOP-PowerPAD

6-SONSOT-223SOT-23

8MSOP-PowerPAD

8MSOP-PowerPAD 20-SON

20-SON7-TO-220

Solution Size3x5mm +3 caps +

2 resistors

5mm x 3mm + 2 caps

3x5mm +3 caps +1 resistor

2x2mm +2 caps

3x5mm +4 caps +

2 resistors

3x5mm +4 caps +

2 resistors

5x5mm +3 caps

5x5mm +3 caps

Wide Vin Linear Regulator Selection GuideLook for Wide Vin parts when the input can experience transients

Pick parts with high PSRR when you need to filter out switching noise

Look for parts with low output noise when dealing with very sensitive RF signals that require a low noise floor

Tools to Help You Start Your Next Wide Vin Circuit Design

Learn with Wide Vin Videos

Start a design today with WEBENCH® Designer

Get design tips from TI experts on E2E Power Forum

Jump start your system design with TI Designs

Order TI eval modules optimized for your systems

LM27403 Tiny 30A POL Module

LM5017 Multi-output Fly-buck EVM

For More

Informationwww.ti.com/WideVin

http://www.ti.com/WideVin

Thank You

Questions?

Mary GannonDesign [email protected]: 440.234.4531Twitter: @DW_MaryGannon

Jim MacDonaldTexas [email protected]: 669-721-7458

mailto:[email protected]

mailto:[email protected]

Thank You This webinar will be available at designworldonline.com & email

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Wide Vin DC/DC Converters: Reliable Power for Demanding Applications

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Transcript of Wide Vin DC/DC Converters: Reliable Power for Demanding Applications