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LM27313

GND

SHDN

51k

SHDN

GND

5 V

2.2 PF

13.3k

120 pF

MBR0530

R1/205k

L1/10 PH

4.7 PF

20V

OUT

130 mA

(TYP)

LM27313

GND

SHDN

51k

SHDN

GND

5 V

2.2 PF

13.3k

220 pF

MBR0520

R1/117k

L1/10 PH

4.7 PF

12V

OUT

260 mA

(TYP)

LM27313

www.ti.com

SNVS487D –DECEMBER 2006–REVISED APRIL 2013

LM27313/LM27313-Q1

Check for Samples: LM27313

FEATURES

DESCRIPTION

The LM27313 switching regulator is a current-mode

• LM27313-Q1 is an Automotive Grade Product

boost converter with a fixed operating frequency of

that is AEC-Q100 Grade 1 Qualified (-40°C to

1.6 MHz.

+125°C Operating Junction Temperature)

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

• 30V DMOS FET Switch

the minimal losses of the 800 mA switch, and small

• 1.6 MHz Switching Frequency

inductors and capacitors result in extremely high

• Low R

(ON) DMOS FET

power density. The 30V internal switch makes these

solutions perfect for boosting to voltages of 5V to

• Switch Current up to 800 mA

28V.

• Wide Input Voltage Range (2.7V–14V)

This part has a logic-level shutdown pin that can be

• Low Shutdown Current (<1 µA)

used to reduce quiescent current and extend battery

• 5-Lead SOT-23 Package

life.

• Uses Tiny Capacitors and Inductors

Protection is provided through cycle-by-cycle current

• Cycle-by-Cycle Current Limiting

limiting and thermal shutdown. Internal compensation

• Internally Compensated

simplifies design and reduces component count.

APPLICATIONS

• White LED Current Source

• PDA’s and Palm-Top Computers

• Digital Cameras

• Portable Phones, Games and Media Players

• GPS Devices

Typical Application Circuits

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 (20 pages)

PAGE 1
LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 LM27313/LM27313-Q1 Check for Samples: LM27313 FEATURES DESCRIPTION • The LM27313 switching regulator is a current-mode boost converter with a fixed operating frequency of 1.6 MHz. 1 2 • • • • • • • • • • LM27313-Q1 is an Automotive Grade Product that is AEC-Q100 Grade 1 Qualified (-40°C to +125°C Operating Junction Temperature) 30V DMOS FET Switch 1.
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LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com Connection Diagram Figure 1. 5-Lead SOT-23 Package – Top View See Package Number DBV PIN DESCRIPTIONS 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 to set VOUT. Shutdown control input. Connect to VIN if this feature is not used. Analog and power input. These devices have limited built-in ESD protection.
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LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 Operating Ratings VIN 2.7V to 14V VSW(MAX) 30V VSHDN 0V to VIN Junction Temperature, TJ (1) -40°C to 125°C θJ-A (SOT-23-5) (1) 265°C/W The maximum power dissipation which can be safely dissipated for any application is a function of the maximum junction temperature, TJ(MAX) = 125°C, the junction-to-ambient thermal resistance for the SOT-23 package, θJ-A = 265°C/W, and the ambient temperature, TA.
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LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics Unless otherwise specified: VIN = 5V, SHDN pin is tied to VIN, TJ = 25°C. Iq VIN (Active) vs Temperature Oscillator Frequency vs Temperature Figure 2. Figure 3. Max. Duty Cycle vs Temperature Feedback Voltage vs Temperature 88.5 MAX DUTY CYCLE (%) 88.4 88.3 88.2 88.1 88.0 87.9 87.8 -40 -25 0 25 50 75 100 125 TEMPERATURE (oC) 4 Figure 4. Figure 5.
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LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 5V, SHDN pin is tied to VIN, TJ = 25°C. RDS(ON) vs VIN Efficiency vs Load Current (VOUT = 12V) Figure 8. Figure 9. Efficiency vs Load Current (VOUT = 15V) Efficiency vs Load Current (VOUT = 20V) 100 100 90 90 VIN = 10V VIN = 5V 70 VIN = 3.3V 60 50 40 30 50 40 30 10 10 0 200 400 800 600 1000 VIN = 3.
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LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com Block Diagram Theory of Operation The LM27313 is a switching converter IC that operates at a fixed frequency of 1.6 MHz using current-mode control for fast transient response over a wide input voltage range and incorporate pulse-by-pulse current limiting protection.
PAGE 7
LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 APPLICATION INFORMATION SELECTING THE EXTERNAL CAPACITORS The LM27313 requires ceramic capacitors at the input and output to accommodate the peak switching currents the part needs to operate. Electrolytic capacitors have resonant frequencies which are below the switching frequency of the device, and therefore can not provide the currents needed to operate.
PAGE 8
LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com Figure 13. Recommended PCB Component Layout Some additional guidelines to be observed: 1. Keep the path between L1, D1, and C2 extremely short. Parasitic trace inductance in series with D1 and C2 will increase noise and ringing. 2. The feedback components R1, R2 and CF must be kept close to the FB pin of the LM27313 to prevent noise injection on the high impedance FB pin. 3.
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LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 INDUCTANCE VALUE The first question we are usually asked is: “How small can I make the inductor?” (because they are the largest sized component and usually the most costly). The answer is not simple and involves trade-offs in performance. More inductance means less inductor ripple current and less output voltage ripple (for a given size of output capacitor).
PAGE 10
LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com 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 Figure 15 below which shows typical values of switch current as a function of effective (actual) duty cycle: SWITCH CURRENT LIMIT (mA) 1600 1400 1200 1000 VIN = 5V VIN = 3.3V 800 600 VIN = 2.
PAGE 11
LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 Figure 16. Max. Load Current 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 12
LM27313 SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 www.ti.com Figure 17. Discontinuous Design, 5V–12V Boost The voltage across the inductor during ON time is 4.8V. Minimum inductance value is found by: L = V x (dt/dl) L = 4.8V x (0.524 µs / 0.8 mA) = 3.144 µH (17) (18) In this case, a 3.3 µH inductor could be used, assuming it provided at least that much inductance up to the 800 mA current value. This same analysis can be used to find the minimum inductance for any boost application.
PAGE 13
LM27313 www.ti.com SNVS487D – DECEMBER 2006 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision C (April 2013) to Revision D • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
PAGE 16
PACKAGE MATERIALS INFORMATION www.ti.com 26-Sep-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) LM27313XMFX SOT-23 DBV 5 3000 178.0 8.4 LM27313XQMF/NOPB SOT-23 DBV 5 1000 178.0 LM27313XQMFX/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.
PAGE 17
PACKAGE MATERIALS INFORMATION www.ti.com 26-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM27313XMFX SOT-23 DBV 5 3000 210.0 185.0 35.0 LM27313XQMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM27313XQMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.
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