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LMR10510

www.ti.com

SNVS727B –OCTOBER 2011–REVISED APRIL 2013

LMR10510 SIMPLE SWITCHER

5.5Vin, 1A Step-Down Voltage Regulator

in SOT-23 and WSON

Check for Samples: LMR10510

FEATURES

DESCRIPTION

The LMR10510 regulator is a monolithic, high

• Input Voltage Range of 3V to 5.5V

frequency, PWM step-down DC/DC converter in a 5

• Output Voltage Range of 0.6V to 4.5V

pin SOT-23 and a 6 Pin WSON package. It provides

• Output Current up to 1A

all the active functions to provide local DC/DC

conversion with fast transient response and accurate

• 1.6MHz (LMR10510X) and 3 MHz (LMR10510Y)

regulation in the smallest possible PCB area. With a

Switching Frequencies

minimum of external components, the LMR10510 is

• Low Shutdown Iq, 30 nA Typical

easy to use. The ability to drive 1.0A loads with an

• Internal Soft-Start

internal 130 mΩ PMOS switch results in the best

power density available. The world-class control

• Internally Compensated

circuitry allows on-times as low as 30ns, thus

• Current-Mode PWM Operation

supporting exceptionally high frequency conversion

• Thermal Shutdown

over the entire 3V to 5.5V input operating range down

to the minimum output voltage of 0.6V. The

• SOT-23 (2.92 x 2.84 x 1 mm) and WSON

LMR10510 is a constant frequency PWM buck

(3 x 3 x 0.8 mm) Packaging

regulator IC that delivers a 1.0A load current. The

• Fully Enabled for WEBENCH

Power Designer

regulator has a preset switching frequency of 1.6MHz

or 3.0MHz. This high frequency allows the LMR10510

APPLICATIONS

to operate with small surface mount capacitors and

inductors, resulting in a DC/DC converter that

• Point-of-Load Conversions from 3.3V, and 5V

requires a minimum amount of board space. The

Rails

LMR10510 is internally compensated, so it is simple

• Space Constrained Applications

to use and requires few external components. Even

• Battery Powered Equipment

though the operating frequency is high, efficiencies

up to 93% are easy to achieve. External shutdown is

• Industrial Distributed Power Applications

included, featuring an ultra-low stand-by current of 30

• Power Meters

nA. The LMR10510 utilizes current-mode control and

• Portable Hand-Held Instruments

internal compensation to provide high-performance

regulation over a wide range of operating conditions.

PERFORMANCE BENEFITS Additional features include internal soft-start circuitry

to reduce inrush current, pulse-by-pulse current limit,

• Extremely easy to use

thermal shutdown, and output over-voltage

• Tiny overall solution reduces system cost

protection.

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.

2WEBENCH is a registered trademark 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 (26 pages)

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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 LMR10510 SIMPLE SWITCHER® 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and WSON Check for Samples: LMR10510 FEATURES DESCRIPTION • • • • The LMR10510 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 5 pin SOT-23 and a 6 Pin WSON package. It provides all the active functions to provide local DC/DC conversion with fast transient response and accurate regulation in the smallest possible PCB area.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com System Performance Efficiency vs Load Current - "Y" VIN = 5V 100 100 90 90 EFFICIENCY (%) EFFICIENCY (%) Efficiency vs Load Current - "X" VIN = 5V 80 70 60 50 80 70 60 50 1.8Vout 3.3Vout 40 1.8Vout 3.3Vout 40 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 LOAD CURRENT (A) 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 PIN DESCRIPTIONS 5-Pin SOT-23 Pin Name Function 1 SW 2 GND Switch node. Connect to the inductor and catch diode. 3 FB Feedback pin. Connect to external resistor divider to set output voltage. 4 EN Enable control input. Logic high enables operation. Do not allow this pin to float or be greater than VIN + 0.3V. 5 VIN Input supply voltage. Signal and power ground pin.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Electrical Characteristics (1) (2) VIN = 5V unless otherwise indicated under the Conditions column. 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 specified through test, design, or statistical correlation.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics Unless stated otherwise, all curves taken at VIN = 5.0V with configuration in typical application circuit shown in Figure 22. TJ = 25°C, unless otherwise specified. η vs Load "Y" Vin = 5V, Vo = 3.3V & 1.8V 100 100 90 90 EFFICIENCY (%) EFFICIENCY (%) η vs Load "X" Vin = 5V, Vo = 1.8V & 3.3V 80 70 60 50 40 80 70 60 50 1.8Vout 3.3Vout 40 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) Unless stated otherwise, all curves taken at VIN = 5.0V with configuration in typical application circuit shown in Figure 22. TJ = 25°C, unless otherwise specified. Oscillator Frequency vs Temperature - "X" Oscillator Frequency vs Temperature - "Y" 3.45 OSCILLATOR FREQUENCY (MHz) OSCILLATOR FREQUENCY (MHz) 1.81 1.76 1.71 1.66 1.61 1.56 1.51 1.46 1.41 1.36 -45 -40 -10 20 50 3.35 3.25 3.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 Typical Performance Characteristics (continued) Unless stated otherwise, all curves taken at VIN = 5.0V with configuration in typical application circuit shown in Figure 22. TJ = 25°C, unless otherwise specified. Line Regulation Vo = 1.8V, Io = 500mA LMR10510Y IQ (Quiescent Current) 4.6 4.5 IQ (mA) 4.4 4.3 4.2 4.1 4.0 -45 -40 -10 20 50 80 110 125 130 TEMPERATURE (ºC) Figure 15. Figure 16.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Simplified Block Diagram EN VIN + ENABLE and UVLO ThermalSHDN I SENSE - + - I LIMIT - 1 .15 x VREF + OVPSHDN Ramp Artificial Control Logic cv I SENSE R R Q + FB S 1.6 MHz PFET - + DRIVER Internal - Comp SW VREF = 0.6V SOFT - START Internal - LDO GND Figure 20.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 VSW D = TON/TSW VIN SW Voltage TOFF TON 0 VD IL t TSW IPK Inductor Current t 0 Figure 21. Typical Waveforms SOFT-START This function forces VOUT to increase at a controlled rate during start up. During soft-start, the error amplifier’s reference voltage ramps from 0V to its nominal value of 0.6V in approximately 600 µs. This forces the regulator output to ramp up in a controlled fashion, which helps reduce inrush current.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Design Guide INDUCTOR SELECTION The Duty Cycle (D) can be approximated quickly using the ratio of output voltage (VO) to input voltage (VIN): D= VOUT VIN The catch diode (D1) forward voltage drop and the voltage drop across the internal PMOS must be included to calculate a more accurate duty cycle.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 When selecting an inductor, make sure that it is capable of supporting the peak output current without saturating. Inductor saturation will result in a sudden reduction in inductance and prevent the regulator from operating correctly. Because of the speed of the internal current limit, the peak current of the inductor need only be specified for the required maximum output current. For example, if the designed maximum output current is 1.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com ID1 = IOUT x (1-D) The reverse breakdown rating of the diode must be at least the maximum input voltage plus appropriate margin. To improve efficiency, choose a Schottky diode with a low forward voltage drop. OUTPUT VOLTAGE The output voltage is set using the following equation where R2 is connected between the FB pin and GND, and R1 is connected between VO and the FB pin. A good value for R2 is 10kΩ.
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LMR10510 www.ti.com D= SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 VOUT + VD + VDCR VIN + VD + VDCR - VSW The conduction losses in the free-wheeling Schottky diode are calculated as follows: PDIODE = VD x IOUT x (1-D) Often this is the single most significant power loss in the circuit. Care should be taken to choose a Schottky diode that has a low forward voltage drop. Another significant external power loss is the conduction loss in the output inductor.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Thermal Definitions TJ = Chip junction temperature TA = Ambient temperature RθJC = Thermal resistance from chip junction to device case RθJA = Thermal resistance from chip junction to ambient air Heat in the LMR10510 due to internal power dissipation is removed through conduction and/or convection. Conduction: Heat transfer occurs through cross sectional areas of material.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 The first step is to determine RθJA of the application. The LMR10510 has over-temperature protection circuitry. When the silicon temperature reaches 165°C, the device stops switching. The protection circuitry has a hysteresis of about 15°C. Once the silicon temperature has decreased to approximately 150°C, the device will start to switch again.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com FB 1 GND 2 6 EN GND 5 VINA PLANE SW 3 4 VIND Figure 25. 6-Lead WSON PCB Dog Bone Layout LMR10510X Design Example 1 FB EN R3 VIN = 5V C1 LMR10510 100k GND L1 VIN SW 3.3 PH 1.5A 22 PF 10V D1 1.5A 20V VO = 1.2V @ 1.0A R1 15k R2 15k C2 22 PF 6.3V Figure 26. LMR10510X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.0A LMR10510X Design Example 2 FB EN R3 VIN = 5V LMR10510 100k VIN GND L1 SW 2.2 PH 1.8A C1 22 PF 10V D1 1.
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LMR10510 www.ti.com SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 LMR10510Y Design Example 3 FB EN R3 VIN = 5V LMR10510 100k GND L1 VIN SW 1.6 PH 2.0A C1 22 PF 10V D1 1.5A 20V VO = 3.3V @ 1.0A R1 45.3k R2 100k C2 22 PF 6.3V Figure 28. LMR10510Y (3MHz): Vin = 5V, Vo = 3.3V @ 1.0A LMR10510Y Design Example 4 FB EN R3 VIN = 5V C1 LMR10510 100k VIN 22 PF 10V GND L1 SW 1.6 PH 2.0A D1 1.5A 20V VO = 1.2V @ 1.0A R1 10k R2 10k C2 22 PF 6.3V Figure 29. LMR10510Y (3MHz): Vin = 5V, Vo = 1.
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LMR10510 SNVS727B – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision A (April 2013) to Revision B • 18 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 (3) 11-Apr-2013 MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) Multiple Top-Side Markings will be inside parentheses. Only one Top-Side Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Top-Side Marking for that device.
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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) LMR10510XMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 LMR10510XMFE/NOPB SOT-23 DBV 5 250 178.0 LMR10510XMFX/NOPB SOT-23 DBV 5 3000 178.
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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) LMR10510XMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMR10510XMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 LMR10510XMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMR10510YMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMR10510YMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.
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MECHANICAL DATA NGG0006A SDE06A (Rev A) www.ti.
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