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LMR64010

www.ti.com

SNVS736B –SEPTEMBER 2011–REVISED APRIL 2013

LMR64010 SIMPLE SWITCHER

40Vout, 1A Step-Up Voltage Regulator in SOT-23

Check for Samples: LMR64010

FEATURES

DESCRIPTION

The LMR64010 switching regulators is a current-

• Input Voltage Range of 2.7V to 14V

mode boost converter operating at a fixed frequency

• Output Voltage up to 40V

of 1.6 MHz.

• Switch Current up to 1A

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

• 1.6 MHz Switching Frequency

minimal power loss of the internal 1A switch, and use

• Low Shutdown Iq, <1 µA

of small inductors and capacitors result in the

industry's highest power density. The 40V internal

• Cycle-by-Cycle Current Limiting

switch makes these solutions perfect for boosting to

• Internally Compensated

voltages of 16V or greater.

• SOT-23-5 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

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 (21 pages)

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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 LMR64010 SIMPLE SWITCHER® 40Vout, 1A Step-Up Voltage Regulator in SOT-23 Check for Samples: LMR64010 FEATURES DESCRIPTION • • • • • • • • • The LMR64010 switching regulators is a currentmode boost converter operating at a fixed frequency of 1.6 MHz. 1 2 Input Voltage Range of 2.7V to 14V Output Voltage up to 40V Switch Current up to 1A 1.
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LMR64010 SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 www.ti.com L1/10 PH 5VIN VIN SHDN GND R3 51k U1 D1 SW LMR64010 SHDN GND C1 2.2 PF R1/205k FB CF 120 pF R2 13.3k 20V OUT 170 mA (TYP) C2 4.7 PF Top View Figure 1. 5-Lead SOT-23 Package See Package Number DBV0005A 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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LMR64010 www.ti.com SNVS736B – SEPTEMBER 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.) 300°C Power Dissipation (3) Internally Limited −0.
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LMR64010 SNVS736B – SEPTEMBER 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. Parameter VIN Test Conditions Input Voltage Min (1) Typ (2) 2.7 (3) ISW Switch Current Limit See RDS(ON) Switch ON Resistance ISW = 100 mA SHDNTH Shutdown Threshold Device ON 1.
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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics Unless otherwise specified: VIN = 5V, SHDN pin is tied to VIN. Iq VIN (Active) vs Temperature Oscillator Frequency vs Temperature Figure 2. Figure 3. Max. Duty Cycle vs Temperature Feedback Voltage vs Temperature 93.4 MAX DUTY CYCLE (%) 93.3 93.2 93.1 93.0 92.9 92.8 92.7 -40 -25 0 25 50 75 100 125 o TEMPERATURE ( C) Figure 4. Figure 5.
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LMR64010 SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 5V, SHDN pin is tied to VIN. 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 60 VIN = 3.3V 50 40 VIN = 10V 80 EFFICIENCY (%) EFFICIENCY (%) 80 VIN = 5V 70 VIN = 3.
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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless otherwise specified: VIN = 5V, SHDN pin is tied to VIN. Efficiency vs Load Current (VOUT = 35V) Efficiency vs Load Current (VOUT = 40V) 100 90 90 80 VIN = 10V VIN=10V 70 70 EFFICIENCY (%) EFFICIENCY (%) 80 60 50 40 30 60 50 40 30 20 20 10 10 0 0 0 50 100 150 0 200 LOAD CURRENT (mA) 50 100 150 200 LOAD CURRENT (mA) Figure 14. Figure 15.
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LMR64010 SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION Theory of Operation The LMR64010 is a switching converter IC that operates at a fixed frequency (1.6 MHz) using current-mode control for fast transient response over a wide input voltage range and incorporates pulse-by-pulse current limiting protection.
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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 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. Without it, the regulator loop can oscillate. The recommended frequency for the zero fz should be approximately 8 kHz.
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LMR64010 SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 www.ti.com 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 17.
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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 An important point to observe is that the LMR64010 will limit its switch current based on peak current. This means that since lp(max) is fixed, increasing L will increase the maximum amount of power available to the load. Conversely, using too little inductance may limit the amount of load current which can be drawn from the output.
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LMR64010 SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 www.ti.com MAXIMUM SWITCH CURRENT The maximum FET swtch 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 both the typical and specified values of switch current as a function of effective (actual) duty cycle: 1600 SWITCH CURRENT LIMIT (mA) 1400 VIN = 5V 1200 1000 VIN = 3.3V 800 VIN = 2.
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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 The equation shown to calculate maximum load current takes into account the losses in the inductor or turn-OFF switching losses of the FET and diode. For actual load current in typical applications, we took bench data for various input and output voltages and displayed the maximum load current available for a typical device in graph form: Figure 21. Max.
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LMR64010 SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 www.ti.com MINIMUM INDUCTANCE In some applications where the maximum load current is relatively small, it may be advantageous to use the smallest possible inductance value for cost and size savings. The converter will operate in discontinuous mode in such a case. The minimum inductance should be selected such that the inductor (switch) current peak on each cycle does not reach the 1A current limit maximum.
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LMR64010 www.ti.com SNVS736B – SEPTEMBER 2011 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision A (April 2013) to Revision B • 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) LMR64010XMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 LMR64010XMFE/NOPB SOT-23 DBV 5 250 178.0 LMR64010XMFX/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) LMR64010XMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMR64010XMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 LMR64010XMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.
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