Texas Instruments LMZ14201 SIMPLE SWITCHER Manuale utente

LMZ14201

www.ti.com

SNVS649E –JANUARY 2010–REVISED MARCH 2013

LMZ14201 1A SIMPLE SWITCHER® Power Module with 42V Maximum Input Voltage

Check for Samples: LMZ14201

1FEATURES DESCRIPTION

2• Integrated Shielded Inductor The LMZ14201 SIMPLE SWITCHER power module

• Simple PCB Layout is an easy-to-use step-down DC-DC solution capable

of driving up to 1A load with exceptional power

• Flexible Startup Sequencing Using External conversion efficiency, line and load regulation, and

Soft-start and Precision Enable output accuracy. The LMZ14201 is available in an

• Protection Against Inrush Currents and Faults innovative package that enhances thermal

such as Input UVLO and Output Short Circuit performance and allows for hand or machine

• – 40°C to 125°C Junction Temperature Range soldering.

• Single Exposed Pad and Standard Pinout for The LMZ14201 can accept an input voltage rail

Easy Mounting and Manufacturing between 6V and 42V and deliver an adjustable and

highly accurate output voltage as low as 0.8V. The

• Fast Transient Response for Powering FPGAs LMZ14201 only requires three external resistors and

and ASICs four external capacitors to complete the power

• Low Output Voltage Ripple solution. The LMZ14201 is a reliable and robust

• Pin-to-pin Compatible Family: design with the following protection features: thermal

shutdown, input under-voltage lockout, output over-

– LMZ14203/2/1 (42V Max 3A, 2A, 1A) voltage protection, short-circuit protection, output

– LMZ12003/2/1 (20V Max 3A, 2A, 1A) current limit, and allows startup into a pre-biased

• Fully Enabled for Webench® Power Designer output. A single resistor adjusts the switching

frequency up to 1 MHz.

APPLICATIONS ELECTRICAL SPECIFICATIONS

• Point of Load Conversions from 12V and 24V

Input Rail • 6W Maximum Total Output Power

• Time Critical Projects • Up to 1A Output Current

• Space Constrained / High Thermal • Input Voltage Range 6V to 42V

Requirement Applications • Output Voltage Range 0.8V to 6V

• Negative Output Voltage Applications • Efficiency up to 90%

(See AN-2027) SNVA425 PERFORMANCE BENEFITS

• Operates at High Ambient Temperature with

no Thermal Derating

• High Efficiency Reduces System Heat

Generation

• Low Radiated Emissions (EMI) Complies with

EN55022 Class B Standard

• Low External Component Count

Figure 1. Easy To Use 7 Pin Package

PFM 7 Pin Package

10.16 x 13.77 x 4.57 mm (0.4 x 0.542 x 0.18 in)

θJA = 20°C/W, θJC = 1.9°C/W

RoHS Compliant

1Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2All trademarks are the property of their respective owners.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

0.0

10.0

30.0

40.0

50.0

70.0

0FREQUENCY (MHz)

RADIATED EMISSIONS (dBµV/m)

20.0

60.0

80.0

200 400 600 800 1000

EN 55022 CLASS B LIMIT

0.2

0.4

0.6

0.8

1.2

50 60 70 80 90 100 110 120

AMBIENT TEMPERATURE (°C)

OUTPUT CURRENT (A)

100

0 0.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

EFFICIENCY (%)

LMZ14201

SNVS649E –JANUARY 2010–REVISED MARCH 2013

www.ti.com

System Performance

Efficiency VIN = 24V VOUT = 5.0V

Thermal Derating Curve

VIN = 24V, VOUT = 5.0V,

Radiated Emissions (EN 55022 Class B)

from Evaluation Board

Product Folder Links: LMZ14201

Exposed Pad

Connect to GND

5 SS

6 FB

3 EN

1 VIN

2 RON

4 GND

7 VOUT

VIN

CIN

10 PF

Enable

RON

See Table RFBT

CFF 0.022 PF

See Table

CSS

0.022 PF

RFBB

See Table 100 PF

LMZ14201

VOUT

RON

VIN

GND

VOUT@ 1A

5V 5.62k 1.07k 100k 7.5...42V

VOUT RFBT RFBB RON VIN Range

3.3V 3.32k 1.07k 61.9k 6...42V

2.5V 2.26k 1.07k 47.5k 6...30V

1.8V 1.87k 1.50k 32.4k 6...25V

1.5V 1.00k 1.13k 28.0k 6...21V

1.2V 4.22k 8.45k 22.6k 6...19V

0.8V 0 39.2k 24.9k 6...18V

LMZ14201

www.ti.com

SNVS649E –JANUARY 2010–REVISED MARCH 2013

Simplified Application Schematic

Connection Diagram

Figure 2. Top View

7-Lead PFM

Pin Descriptions

Pin Name Description

1 VIN Supply input — Nominal operating range is 6V to 42V . A small amount of internal capacitance is contained within the

package assembly. Additional external input capacitance is required between this pin and exposed pad.

2 RON On Time Resistor — An external resistor from VIN to this pin sets the on-time of the application. Typical values range from

25k to 124k ohms.

3 EN Enable — Input to the precision enable comparator. Rising threshold is 1.18V nominal; 90 mV hysteresis nominal.

Maximum recommended input level is 6.5V.

4 GND Ground — Reference point for all stated voltages. Must be externally connected to EP.

5 SS Soft-Start — An internal 8 µA current source charges an external capacitor to produce the soft-start function. This node is

discharged at 200 µA during disable, over-current, thermal shutdown and internal UVLO conditions.

6 FB Feedback — Internally connected to the regulation, over-voltage, and short-circuit comparators. The regulation reference

point is 0.8V at this input pin. Connected the feedback resistor divider between the output and ground to set the output

voltage.

7 VOUT Output Voltage — Output from the internal inductor. Connect the output capacitor between this pin and exposed pad.

EP EP Exposed Pad — Internally connected to pin 4. Used to dissipate heat from the package during operation. Must be

electrically connected to pin 4 external to the package.

These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam

during storage or handling to prevent electrostatic damage to the MOS gates.

Product Folder Links: LMZ14201

LMZ14201

SNVS649E –JANUARY 2010–REVISED MARCH 2013

www.ti.com

Absolute Maximum Ratings (1)(2)

VIN, RON to GND -0.3V to 43.5V

EN, FB, SS to GND -0.3V to 7V

Junction Temperature 150°C

Storage Temperature Range -65°C to 150°C

ESD Susceptibility(3) ± 2 kV

For soldering specifications:

see product folder at www.ti.com and SNOA549

(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics.

(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

(3) The human body model is a 100pF capacitor discharged through a 1.5 kΩresistor into each pin. Test method is per JESD-22-114.

Operating Ratings (1)

VIN 6V to 42V

EN 0V to 6.5V

Operation Junction Temperature −40°C to 125°C

(1) Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which

operation of the device is intended to be functional. For ensured specifications and test conditions, see the Electrical Characteristics.

Product Folder Links: LMZ14201

LMZ14201

www.ti.com

SNVS649E –JANUARY 2010–REVISED MARCH 2013

Electrical Characteristics

Limits in standard type are for TJ= 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C

to +125°C. Minimum and Maximum limits are ensured through test, design or statistical correlation. Typical values represent

the most likely parametric norm at TJ= 25°C, and are provided for reference purposes only. Unless otherwise stated the

following conditions apply: VIN = 24V, Vout = 3.3V Min Typ Max

Symbol Parameter Conditions Units

(1) (2) (1)

SYSTEM PARAMETERS

Enable Control(3)

VEN EN threshold trip point VEN rising 1.10 1.18 1.25 V

VEN-HYS EN threshold hysteresis VEN falling 90 mV

Soft-Start

ISS SS source current VSS = 0V 5811 µA

ISS-DIS SS discharge current -200 µA

Current Limit

ICL Current limit threshold d.c. average 1.4 1.95 3.0 A

ON/OFF Timer

tON-MIN ON timer minimum pulse width 150 ns

tOFF OFF timer pulse width 260 ns

Regulation and Over-Voltage Comparator

VFB In-regulation feedback voltage VSS >+ 0.8V .777 0.798 0.818 V

TJ= -40°C to 125°C

IO= 1A

VSS >+ 0.8V 0.786 0.802 0.818 V

TJ= 25°C

IO= 10 mA

VFB-OV Feedback over-voltage 0.92 V

protection threshold

IFB Feedback input bias current 5 nA

IQNon Switching Input Current VFB= 0.86V 1 mA

ISD Shut Down Quiescent Current VEN= 0V 25 μA

Thermal Characteristics

TSD Thermal Shutdown Rising 165 °C

TSD-HYST Thermal shutdown hysteresis Falling 15 °C

θJA Junction to Ambient(4) 4 layer JEDEC Printed Circuit Board, 19.3 °C/W

100 vias, No air flow

2 layer JEDEC Printed Circuit Board, No 21.5 °C/W

air flow

θJC Junction to Case No air flow 1.9 °C/W

PERFORMANCE PARAMETERS

ΔVOOutput Voltage Ripple 8 mV PP

ΔVO/ΔVIN Line Regulation VIN = 12V to 42V, IO= 1A .01 %

ΔVO/IOUT Load Regulation VIN = 24V 1.5 mV/A

ηEfficiency VIN = 24V VO= 3.3V IO= 1A 92 %

(1) Min and Max limits are 100% production tested at 25°C. Limits over the operating temperature range are ensured through correlation

using Statistical Quality Control (SQC) methods. Limits are used to calculate Average Outgoing Quality Level (AOQL).

(2) Typical numbers are at 25°C and represent the most likely parametric norm.

(3) EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007. See AN-2024 and layout for information on device under test.

(4) θJA measured on a 1.705” x 3.0” four layer board, with one ounce copper, thirty five 12 mil thermal vias, no air flow, and 1W power

dissipation. Refer to PCB layout diagrams

Product Folder Links: LMZ14201

0.1

0.2

0.3

0.6

0.7

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

25°C

0.4

0.5

2.5

3.3

5.0

6.0

1.8

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

25°C

1.8

3.3

2.5

5.0

6.0

0.075

0.15

0.225

0.3

0.375

0.45

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

25°C

1.5

1.8

2.5

3.3

1.2

0.8

5.0

6.0

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

25°C

1.8

1.2

1.5

0.8

3.3

2.5

5.0

6.0

0.05

0.1

0.15

0.2

0.25

0.3

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

25°C

1.2

0.8

1.5

1.8

2.5

3.3

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

25°C

1.8

1.2

1.5

0.8

3.3

2.5

LMZ14201

SNVS649E –JANUARY 2010–REVISED MARCH 2013

www.ti.com

Typical Performance Characteristics

Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO= 100uF X7R Ceramic;

Tambient = 25 C for efficiency curves and waveforms.

Efficiency 6V Input @ 25°C Dissipation 6V Input @ 25°C

Figure 3. Figure 4.

Efficiency 12V Input @ 25°C Dissipation 12V Input @ 25°C

Figure 5. Figure 6.

Efficiency 24V Input @ 25°C Dissipation 24V Input @ 25°C

Figure 7. Figure 8.

Product Folder Links: LMZ14201

0.075

0.15

0.225

0.3

0.375

0.45

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

85°C

1.5

1.8

1.2

2.5

3.3

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

85°C

1.8

1.2

1.5

3.3

2.5

0.2

0.4

0.6

0.8

1.0

1.2

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

25°C

3.3

5.0

6.0

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

25°C

3.3

5.0

6.0

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

25°C

3.3

5.0

6.0

0.2

0.4

0.6

0.8

1.0

1.2

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

25°C

3.3

5.0

6.0

LMZ14201

www.ti.com

SNVS649E –JANUARY 2010–REVISED MARCH 2013

Typical Performance Characteristics (continued)

Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO= 100uF X7R Ceramic;

Tambient = 25 C for efficiency curves and waveforms.

Efficiency 36V Input @ 25°C Dissipation 36V Input @ 25°C

Figure 9. Figure 10.

Efficiency 42V Input @ 25°C Dissipation 42V Input @ 25°C

Figure 11. Figure 12.

Efficiency 6V Input @ 85°C Dissipation 6V Input @ 85°C

Figure 13. Figure 14.

Product Folder Links: LMZ14201

0.2

0.4

0.6

0.8

1.0

1.2

00.2 0.4 0.6 0.8 1

DISSIPATION (W)

85°C

3.3

5.0

6.0

2.5

1.8

OUTPUT CURRENT (A)

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

85°C

1.8

3.3

2.5

5.0

6.0

0.1

0.2

0.3

0.4

0.5

0.6

0 0.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

85°C

1.2

2.5

3.3

5.0

6.0

1.5

1.8

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

85°C

1.8

1.2

1.5

3.3

2.5

5.0

6.0

0.075

0.15

0.225

0.3

0.375

0.45

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

DISSIPATION (W)

85°C

1.5

1.8

1.2

2.5

3.3

5.0

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

85°C

1.8

1.2

1.5

3.3

2.5

5.0

LMZ14201

SNVS649E –JANUARY 2010–REVISED MARCH 2013

www.ti.com

Typical Performance Characteristics (continued)

Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO= 100uF X7R Ceramic;

Tambient = 25 C for efficiency curves and waveforms.

Efficiency 8V Input 85°C Dissipation 8V Input 85°C

Figure 15. Figure 16.

Efficiency 12V Input@ 85°C Dissipation 12V Input @ 85°C

Figure 17. Figure 18.

Efficiency 24V Input @ 85°C Dissipation 24V Input @ 85°C

Figure 19. Figure 20.

Product Folder Links: LMZ14201

3.26

3.28

3.30

3.32

3.34

3.36

0 0.2

OUTPUT CURRENT (A)

OUTPUT VOLTAGE (V)

85°C

0.4 0.6 0.8 1.0

812

3.24

3.26

3.28

3.30

3.32

3.34

0 0.2

OUTPUT CURRENT (A)

OUTPUT VOLTAGE (V)

25°C

0.4 0.6 0.8 1.0

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

85°C

3.3

5.0

6.0

0.2

0.4

0.6

0.8

1.0

1.2

00.2 0.4 0.6 0.8 1

DISSIPATION (W)

85°C

3.3

5.0

6.0

OUTPUT CURRENT (A)

0.2

0.4

0.6

0.8

1.0

1.2

00.2 0.4 0.6 0.8 1

DISSIPATION (W)

85°C

3.3

5.0

6.0

OUTPUT CURRENT (A)

EFFICIENCY (%)

100

00.2 0.4 0.6 0.8 1

OUTPUT CURRENT (A)

85°C

3.3

5.0

6.0

LMZ14201

www.ti.com

SNVS649E –JANUARY 2010–REVISED MARCH 2013

Typical Performance Characteristics (continued)

Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO= 100uF X7R Ceramic;

Tambient = 25 C for efficiency curves and waveforms.

Efficiency 36V Input @ 85°C Dissipation 36V Input @ 85°C

Figure 21. Figure 22.

Efficiency 42V Input @ 85°C Dissipation 42V Input @ 85°C

Figure 23. Figure 24.

Line and Load Regulation @ 25°C Line and Load Regulation @ 85°C

Figure 25. Figure 26.

Product Folder Links: LMZ14201

1.9

2.0

2.1

2.2

2.3

2.4

2.5

010 20 30 40 50

INPUT VOLTAGE (V)

CURRENT (A)

85°C

SHORT CIRCUIT

ONSET

1.8

1.9

2.0

2.1

2.2

2.3

2.4

010 20 30 40 50

INPUT VOLTAGE (V)

CURRENT (A)

25°C

SHORT CIRCUIT

ONSET

1.8

1.9

2.0

2.1

2.2

2.3

2.4

05 10 15 20 25

INPUT VOLTAGE (V)

CURRENT (A)

25°C

SHORT CIRCUIT

ONSET

0.2

0.4

0.6

0.8

1.2

50 60 70 80 90 100 110 120

AMBIENT TEMPERATURE (C)

OUTPUT CURRENT (A)

36VIN

6VIN

24VIN

12VIN

VOUT = 3.3V

ÆJA = 19°C/W

20 mV/Div 200 Ps/Div

0.5 A/Div

LMZ14201

SNVS649E –JANUARY 2010–REVISED MARCH 2013

www.ti.com

Typical Performance Characteristics (continued)

Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO= 100uF X7R Ceramic;

Tambient = 25 C for efficiency curves and waveforms.

Output Ripple Transient Response

24VIN 3.3VO1A, BW = 200 MHz 24VIN 3.3VO0.5A to 1A Step

Figure 27. Figure 28.

Thermal Derating VOUT = 3.3V Current Limit 1.8VOUT@ 25°C

Figure 29. Figure 30.

Current Limit 3.3VOUT@ 25°C Current Limit 3.3VOUT@ 85°C

Figure 31. Figure 32.

Product Folder Links: LMZ14201

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