Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost SOT 23 5

0 20 40 60 80 100 120 140 160

LOAD (mA)

EFFICIENCY (%)

LOAD CURRENT (mA)

100

200

300

400

100

500

LMR62014

www.ti.com

SNVS735B –OCTOBER 2011–REVISED APRIL 2013

LMR62014 SIMPLE SWITCHER

20Vout, 1.4A Step-Up Voltage Regulator in SOT-23

Check for Samples: LMR62014

FEATURES

DESCRIPTION

The LMR62014 switching regulator is a current-mode

• Input Voltage Range of 2.7V to 14V

boost converter operating at fixed frequency of

• Output Voltage up to 20V

1.6 MHz.

• Switch Current up to 1.4A

The use of SOT-23 package, made possible by the

• 1.6 MHz Switching Frequency

minimal power loss of the internal 1.4A switch, and

• Low Shutdown Iq, <1 µA

use of small inductors and capacitors result in the

industry's highest power density. The LMR62014 is

• Cycle-by-Cycle Current Limiting

capable of greater than 90% duty cycle, making it

• Internally Compensated

ideal for boosting to voltages up to 20V.

• 5-Pin SOT-23 Packaging (2.92 x 2.84 x 1.08mm)

These parts have a logic-level shutdown pin that can

• Fully Enabled for WEBENCH

Power Designer

be used to reduce quiescent current and extend

battery life.

PERFORMANCE BENEFITS

Protection is provided through cycle-by-cycle current

• Extremely Easy to Use

limiting and thermal shutdown. Internal compensation

simplifies design and reduces component count.

• Tiny Overall Solution Reduces System Cost

APPLICATIONS

• Boost Conversions from 3.3V, 5V, and 12V

Rails

• Space Constrained Applications

• Embedded Systems

• LCD Displays

• LED Applications

System Performance

Efficiency vs Load Current Efficiency vs Load Current

= 3.3V, V

OUT

= 12V V

= 5V, V

OUT

= 12V

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.

2SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.

3All other 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 (22 pages)

PAGE 1
LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 LMR62014 SIMPLE SWITCHER® 20Vout, 1.4A Step-Up Voltage Regulator in SOT-23 Check for Samples: LMR62014 FEATURES DESCRIPTION • • • • • • • • • The LMR62014 switching regulator is a current-mode boost converter operating at fixed frequency of 1.6 MHz. 1 23 Input Voltage Range of 2.7V to 14V Output Voltage up to 20V Switch Current up to 1.4A 1.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com L1/10 PH 5VIN U1 VIN SHDN GND R3 51k C1 2.2 PF D1 SW LMR62014 SHDN GND R1/117k FB R2 13.3k CF 220 pF 12V OUT 500 mA (TYP) C2 4.7 PF Connection Diagram Figure 1. 5-Lead SOT-23 (Top View) See DBV Package PIN DESCRIPTIONS 2 Pin Name 1 SW 2 GND 3 FB 4 SHDN 5 VIN Function Drain of the internal FET switch. Analog and power ground. Feedback point that connects to external resistive divider. Shutdown control input.
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LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 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. Absolute Maximum Ratings (1) (2) Storage Temperature Range −65°C to +150°C Operating Junction Temperature Range −40°C to +125°C Lead Temp. (Soldering, 5 sec.) Power Dissipation 300°C (3) Internally Limited FB Pin Voltage −0.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Electrical Characteristics Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range (−40°C ≤ TJ ≤ +125°C). Unless otherwise specified: VIN = 5V, VSHDN = 5V, IL = 0A. Symbol VIN Parameter Min (1) Conditions Input Voltage VOUT (MIN) Minimum Output Voltage Under Load Typical (2) 2.7 RL = 43Ω (3) VIN = 2.7V 5.4 7 VIN = 3.3V 8 10 VIN = 5V RL = 15Ω (3) VIN = 2.
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LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics Unless otherwise specified: VIN = 5V, SHDN pin tied to VIN. Iq Vin (Active) vs Temperature 2.15 1.56 OSCILLATOR FREQUENCY (MHz) 1.58 2.1 IQ VIN ACTIVE (mA) Oscillator Frequency vs Temperature 2.2 2.05 2 1.95 1.9 1.85 1.8 -50 -25 0 25 50 75 VIN = 5V 1.54 1.52 VIN = 3.3V 1.5 1.48 1.46 1.44 1.42 1.4 -50 100 125 150 -25 0 TEMPERATURE ( C) Figure 2.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 5V, SHDN pin tied to VIN. RDS(ON) vs Temperature Current Limit vs Temperature 0.5 2.6 0.45 2.5 0.4 CURRENT LIMIT (A) Vin = 3.3V RDS(ON) (:) 0.35 0.3 Vin = 5V 0.25 0.2 0.15 2.4 2.3 2.2 0.1 2.1 0.05 0 2 -40 0 -25 25 50 75 100 125 -40 -25 o 0 25 50 75 100 125 TEMPERATURE (oC) TEMPERATURE ( C) Figure 8. Figure 9.
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LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 5V, SHDN pin tied to VIN. Efficiency vs Load Current VIN = 2.7V, VOUT = 12V 80 70 70 60 60 50 EFFICIENCY (%) EFFICIENCY (%) 80 Efficiency vs Load Current VIN = 3.3V, VOUT = 12V 40 30 50 40 30 20 20 10 10 0 10 20 30 40 0 50 0 20 40 60 80 100 120 140 160 LOAD (mA) LOAD (mA) Figure 14. Figure 15.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.
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LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 THEORY OF OPERATION The LMR62014 is a switching converter IC that operates at a fixed frequency (1.6 MHz) for fast transient response over a wide input voltage range and incorporates pulse-by-pulse current limiting protection.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com FEED-FORWARD COMPENSATION Although internally compensated, the feed-forward capacitor Cf is required for stability (see Basic Application Circuit). Adding this capacitor puts a zero in the loop response of the converter. The recommended frequency for the zero fz should be approximately 6 kHz.
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LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 SETTING THE OUTPUT VOLTAGE The output voltage is set using the external resistors R1 and R2 (see Basic Application Circuit). A value of approximately 13.3 kΩ is recommended for R2 to establish a divider current of approximately 92 µA. R1 is calculated using the formula: R1 = R2 X (VOUT/1.23 − 1) (2) Figure 19.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com To better understand these trade-offs, a typical application circuit (5V to 12V boost with a 10 µH inductor) will be analyzed. We will assume: VIN = 5V, VOUT = 12V, VDIODE = 0.5V, VSW = 0.5V (5) Since the frequency is 1.6 MHz (nominal), the period is approximately 0.625 µs. The duty cycle will be 62.5%, which means the ON time of the switch is 0.390 µs.
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LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 MAXIMUM SWITCH CURRENT The maximum FET switch current available before the current limiter cuts in is dependent on duty cycle of the application. This is illustrated in the graphs below which show typical values of switch current as a function of effective (actual) duty cycle: 3000 SW CURRENT LIMIT (mA) 2500 VIN = 5V 2000 VIN = 3.3V 1500 1000 VIN = 2.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com MAX LOAD CURRENT (mA) 1200 1000 800 VOUT = 5V 600 VOUT = 8V 400 VOUT = 10V VOUT = 12V 200 VOUT = 18V 0 2 3 4 5 6 7 8 9 10 11 VIN (V) Figure 22. Max. Load Current (typ) vs VIN DESIGN PARAMETERS VSW AND ISW The value of the FET "ON" voltage (referred to as VSW in the equations) is dependent on load current. A good approximation can be obtained by multiplying the "ON Resistance" of the FET times the average inductor current.
PAGE 15
LMR62014 www.ti.com SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 L1/10 PH 3.3 VIN U1 VIN SHDN R3 51k D1 SW LMR62014 C1 2.2 PF SHDN GND R1/84k FB R2 13.3k GND 9V OUT 240 mA (typ) CF 330 pF D2 D4 D3 D5 C2 4.7 PF R4 R5 EFFICIENCY (%) Efficiency vs Load Current 100 90 80 70 60 50 40 30 20 10 0 3.3 - 9V Boost 0 50 100 150 200 250 300 LOAD (mA) Figure 23.
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LMR62014 SNVS735B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision A (April 2013) to Revision B • 16 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 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) LMR62014XMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 LMR62014XMFE/NOPB SOT-23 DBV 5 250 178.0 LMR62014XMFX/NOPB SOT-23 DBV 5 3000 178.0 3.2 3.2 1.4 4.0 8.0 Q3 8.4 3.2 3.2 1.4 4.0 8.0 Q3 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) LMR62014XMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMR62014XMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 LMR62014XMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.
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