Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder SOT 6

0.00 0.05 0.10 0.15 0.20 0.25 0.30

100

EFFICIENCY (%)

LOAD CURRENT (A)

1.2Vout

3.3Vout

0.00 0.05 0.10 0.15 0.20 0.25 0.30

100

EFFICIENCY (%)

LOAD CURRENT (A)

1.2Vout

3.3Vout

LMR14203

www.ti.com

SNVS732C –OCTOBER 2011–REVISED APRIL 2013

LMR14203 SIMPLE SWITCHER

42Vin, 0.3A Step-Down Voltage Regulator in SOT-23

Check for Samples: LMR14203

FEATURES

DESCRIPTION

The LMR14203 is a PWM DC/DC buck (step-down)

• Input Voltage Range of 4.5V to 42V

regulator. With a wide input range from 4.5V-42V, it is

• Output Voltage Range of 0.765V to 34V

suitable for a wide range of applications such as

• Output Current up to 0.3A

power conditioning from unregulated sources. They

feature a low R

DSON

(0.9Ω typical) internal switch for

• 1.25 MHz Switching Frequency

maximum efficiency (85% typical). Operating

• Low Shutdown Iq, 16 µA Typical

frequency is fixed at 1.25 MHz allowing the use of

• Short Circuit Protected

small external components while still being able to

have low output voltage ripple. Soft-start can be

• Internally Compensated

implemented using the shutdown pin with an external

• Soft-Start Function

RC circuit allowing the user to tailor the soft-start time

• Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)

to a specific application.

• Fully Enabled for WEBENCH® Power Designer

The LMR14203 is optimized for up to 300 mA load

current.

PERFORMANCE BENEFITS

Additional features include: thermal shutdown, V

• Tight Accuracy for Powering Digital ICs

under-voltage lockout, and gate drive under-voltage

• Extremely Easy to Use

lockout. The LMR14203 is available in a low profile

SOT-6L package.

• Tiny Overall Solution Reduces System Cost

APPLICATIONS

• Point-of-Load Conversions from 5V, 12V, and

24V Rails

• Space Constrained Applications

• Battery Powered Equipment

• Industrial Distributed Power Applications

• Power Meters

• Portable Hand-Held Instruments

System Performance

Efficiency vs Load Current Efficiency vs Load Current

= 12V, V

OUT

= 1.2V and 3.3V V

= 24V, V

OUT

= 1.2V and 3.3V

Please 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.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (17 pages)

PAGE 1
LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 LMR14203 SIMPLE SWITCHER® 42Vin, 0.3A Step-Down Voltage Regulator in SOT-23 Check for Samples: LMR14203 FEATURES DESCRIPTION • • • • • • • • • • The LMR14203 is a PWM DC/DC buck (step-down) regulator. With a wide input range from 4.5V-42V, it is suitable for a wide range of applications such as power conditioning from unregulated sources. They feature a low RDSON (0.9Ω typical) internal switch for maximum efficiency (85% typical).
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LMR14203 SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com CBOOT L1 VOUT LMR14203 VIN VIN CB SHDN SW GND FB D1 R1 R2 CIN COUT Connection Diagram Top View LMR14203 CB 1 GND 2 FB 3 PIN 1 ID 6 SW 5 VIN 4 SHDN Figure 1. 6 Lead SOT Package See Package Number DDC0006A Pin Descriptions Pin Name Function 1 CB 2 GND SW FET gate bias voltage. Connect CBOOT cap between CB and SW. 3 FB 4 SHDN 5 VIN Power input voltage pin: 4.5V to 42V normal operating range.
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LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 Absolute Maximum Ratings (1) (2) VIN -0.3V to +45V SHDN -0.3V to (VIN+0.3V) <45V SW Voltage -0.3V to +45V CB Voltage above SW Voltage 7V FB Voltage -0.3V to +5V Maximum Junction Temperature 150°C Power Dissipation (3) Internally Limited For soldering specifications:http://www.ti.com/lit/SNOA549 ESD Susceptibility (4) Human Body Model (1) (2) (3) (4) 1.
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LMR14203 SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Electrical Characteristics Specifications in standard type face are for TJ = 25°C and those with boldface type apply over the full Operating Temperature Range ( TJ = −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.
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LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics Efficiency vs. Load Current (VOUT = 3.3V) Input UVLO Voltage vs. Temperature 100 VIN = 12V EFFICIENCY (%) 80 VIN = 36V 60 VIN = 24V 40 20 0 0.0 0.1 0.2 0.3 LOAD CURRENT (A) Figure 2. Figure 3. Switch Current Limit vs. SHDN Pin Voltage (Soft-start Implementation) SHDN Pin Current vs. SHDN Pin Voltage SWITCH CURRENT LIMIT (mA) 800 600 400 200 0 1.0 1.6 2.2 2.8 3.4 4.
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LMR14203 SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Load Transient Waveforms Start-Up Waveform VIN = 12V, VOUT = 3.3V, IOUT = 300 mA to 200 mA to 300 mA Top trace: VOUT, 20 mV/div, AC Coupled Bottom trace: IOUT, 100 mA/div, DC Coupled T = 200 µs/div Figure 7. VIN = 12V, VOUT = 3.3V, IOUT = 50 mA Top trace: VOUT, 1V/div, DC Coupled Bottom trace: SHDN, 2V/div, DC Coupled T = 40 µs/div Figure 8.
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LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 APPLICATION INFORMATION Protection The LMR14203 has dedicated protection circuitry running during normal operation to protect the IC. The thermal shutdown circuitry turns off the power device when the die temperature reaches excessive levels. The UVLO comparator protects the power device during supply power startup and shutdown to prevent operation at voltages less than the minimum input voltage.
PAGE 8
LMR14203 SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com available with a bigger winding area. A good tradeoff between the efficiency and the core size is letting the inductor copper loss equal 2% of the output power. See AN-1197 SNVA038 for more information on selecting inductors. A good starting point for most applications is a 10 µH to 22 µH with a 0.7A or greater current rating for the LMR14203. Using such a rating will enable the LMR14203 to current limit without saturating the inductor.
PAGE 9
LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 Typical Applications C BOOT LMR14203 L1 15 PH 3.3V OUT 0.15 PF 4.5V to 42V IN VIN CB SHDN SW GND FB D1 60V 500 mA R1 3.4k R2 1.02k CIN 2.2 PF COUT 47 PF Figure 9. Application Circuit, 3.3V Output L1 15 PH CBOOT LMR14203 5V OUT 0.15 PF 7V to 42V IN VIN CB SHDN SW GND FB D1 60V 500 mA R1 5.62k R2 1.02k CIN 2.2 PF COUT 47 PF Figure 10. Application Circuit, 5V Output L1 47 PH CBOOT LMR14203 15V to 42V IN 12V OUT 0.
PAGE 10
LMR14203 SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com L1 47 PH CBOOT LMR14203 0.15 PF 18V to 42V IN VIN CB SHDN SW GND FB 15V OUT D1 60V 500 mA R1 28k R2 1.5k CIN 2.2 PF COUT 22 PF Figure 12. Application Circuit, 15V Output L1 10 PH CBOOT LMR14203 4.5V to 12V IN 0.8V OUT 0.15 PF VIN CB SHDN SW GND FB D1 60V 500 mA R1 30.9 CIN 2.2 PF R2 787 COUT 100 PF Figure 13. Application Circuit, 0.
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LMR14203 www.ti.com SNVS732C – OCTOBER 2011 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision B (April 2013) to Revision C • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing LMR14203XMK/NOPB SOT DDC 6 LMR14203XMKE/NOPB SOT DDC LMR14203XMKX/NOPB SOT DDC SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 6 250 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 6 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMR14203XMK/NOPB SOT DDC 6 1000 210.0 185.0 35.0 LMR14203XMKE/NOPB SOT DDC 6 250 210.0 185.0 35.0 LMR14203XMKX/NOPB SOT DDC 6 3000 210.0 185.0 35.
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