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LMR10515

www.ti.com

SNVS728C –OCTOBER 2011–REVISED APRIL 2013

LMR10515 SIMPLE SWITCHER

5.5Vin, 1.5A Step-Down Voltage Regulator

in SOT-23 and WSON

Check for Samples: LMR10515

FEATURES

PERFORMANCE BENEFITS

• Input Voltage Range of 3V to 5.5V

• Extremely easy to use

• Output Voltage Range of 0.6V to 4.5V • Tiny overall solution reduces system cost

• Output Current up to 1.5A

DESCRIPTION

• 1.6MHz (LMR10515X) and 3 MHz (LMR10515Y)

The LMR10515 regulator is a monolithic, high

Switching Frequencies

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

• Low Shutdown Iq, 30 nA Typical

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

• Internal Soft-Start

all the active functions to provide local DC/DC

conversion with fast transient response and accurate

• Internally Compensated

regulation in the smallest possible PCB area. With a

• Current-Mode PWM Operation

minimum of external components, the LMR10515 is

• Thermal Shutdown

easy to use. The ability to drive 1.5A loads with an

internal 130 mΩ PMOS switch results in the best

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

power density available. The world-class control

(3 x 3 x 0.8 mm) Packaging

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

• Fully Enabled for WEBENCH

Power Designer

supporting exceptionally high frequency conversion

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

APPLICATIONS

to the minimum output voltage of 0.6V. The

LMR10515 is internally compensated, so it is simple

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

to use and requires few external components.

Rails

Switching frequency is internally set to 1.6 MHz, or

• Space Constrained Applications

3.0 MHz, allowing the use of extremely small surface

• Battery Powered Equipment

mount inductors and chip capacitors. Even though the

operating frequency is high, efficiencies up to 93%

• Industrial Distributed Power Applications

are easy to achieve. External shutdown is included,

• Power Meters

featuring an ultra-low stand-by current of 30 nA. The

• Portable Hand-Held Instruments

LMR10515 utilizes current-mode control and internal

compensation to provide high-performance regulation

over a wide range of operating conditions. Additional

features include internal soft-start circuitry to reduce

inrush current, pulse-by-pulse current limit, thermal

shutdown, and output over-voltage 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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LMR10515 www.ti.com SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 LMR10515 SIMPLE SWITCHER® 5.5Vin, 1.5A Step-Down Voltage Regulator in SOT-23 and WSON Check for Samples: LMR10515 FEATURES PERFORMANCE BENEFITS • • • • • • 1 23 • • • • • • • Input Voltage Range of 3V to 5.5V Output Voltage Range of 0.6V to 4.5V Output Current up to 1.5A 1.
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LMR10515 SNVS728C – 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 70 60 50 1.8Vout 3.3Vout 40 0.00 80 0.25 0.50 0.75 1.00 1.25 LOAD CURRENT (A) 1.8Vout 3.3Vout 40 1.50 0.00 0.25 0.50 0.75 1.00 1.25 LOAD CURRENT (A) 1.
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LMR10515 www.ti.com SNVS728C – 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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LMR10515 SNVS728C – 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 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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LMR10515 www.ti.com SNVS728C – 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 80 70 60 50 1.8Vout 3.3Vout 40 0.00 1.8Vout 3.3Vout 40 0.25 0.50 0.75 1.00 1.
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LMR10515 SNVS728C – 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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LMR10515 www.ti.com SNVS728C – 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 LMR10515Y 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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LMR10515 SNVS728C – 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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LMR10515 www.ti.com SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 APPLICATIONS INFORMATION THEORY OF OPERATION The following operating description of the LMR10515 will refer to the Simplified Block Diagram Figure 20 and to the waveforms in Figure 21. The LMR10515 supplies a regulated output voltage by switching the internal PMOS control switch at constant frequency and variable duty cycle. A switching cycle begins at the falling edge of the reset pulse generated by the internal oscillator.
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LMR10515 SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com THERMAL SHUTDOWN Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn’t turn on until the junction temperature drops to approximately 150°C. EN R3 VIN 3.3 PH (³;´ YHUVLRQ) U1 6 4, 5 2 EN SW 1.0 PH VINA/VIND GND VOUT L1 3 FB 1.8V R1 1 20k C3 22 PF C1 2.2 PF C2 D1 R2 10k 2.
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LMR10515 www.ti.com SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 ΔiL = 0.1 x (IOUT) → 0.2 x (IOUT) If ΔiL = 20% of 1.50A, the peak current in the inductor will be 1.8A. The minimum specified current limit over all operating conditions is 1.8A. One can either reduce ΔiL, or make the engineering judgment that zero margin will be safe enough. The typical current limit is 2.5A. The LMR10515 operates at frequencies allowing the use of ceramic output capacitors without compromising transient response.
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LMR10515 SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com When using MLCCs, the ESR is typically so low that the capacitive ripple may dominate. When this occurs, the output ripple will be approximately sinusoidal and 90° phase shifted from the switching action. Given the availability and quality of MLCCs and the expected output voltage of designs using the LMR10515, there is really no need to review any other capacitor technologies.
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LMR10515 www.ti.com SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 Power loss (PLOSS) is the sum of two basic types of losses in the converter: switching and conduction. Conduction losses usually dominate at higher output loads, whereas switching losses remain relatively fixed and dominate at lower output loads.
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LMR10515 SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com Table 1. Power Loss Tabulation (continued) FSW 1.6MHz IQ 3.3mA PQ 16.5mW 20mW TRISE 4nS PSWR TFALL 4nS PSWF 20mW RDS(ON) 150mΩ PCOND 156mW INDDCR 70mΩ PIND 110mW D 0.
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LMR10515 www.ti.com SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 where TC is the temperature of the exposed pad and can be measured on the bottom side of the PCB. Therefore: Tj = (RθJC x PLOSS) + TC From the previous example: Tj = (RθJC x PINTERNAL) + TC Tj = 18°C/W x 0.213W + TC The second method can give a very accurate silicon junction temperature. The first step is to determine RθJA of the application. The LMR10515 has over-temperature protection circuitry.
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LMR10515 SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com FB 1 GND 2 6 EN GND 5 VINA PLANE SW 3 4 VIND Figure 24. 6-Lead WSON PCB Dog Bone Layout LMR10515X Design Example 1 FB EN R3 LMR10515 100k GND L1 VIN SW VIN = 5V C1 3.3 PH 2.2A 22 PF 10V VO = 1.2V @ 1.5A R1 15k D1 1.5A 20V R2 15k C2 2 x 22 PF 6.3V Figure 25. LMR10515X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.5A LMR10515X Design Example 2 FB EN R3 LMR10515 100k VIN GND L1 SW VIN = 5V C1 2.7 PH 2.3A 22 PF 10V D1 1.
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LMR10515 www.ti.com SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 LMR10515Y Design Example 3 FB EN LMR10515 100k R3 GND L1 VO = 3.3V @ 1.5A SW VIN VIN = 5V 1.6 PH 2.0A 22 PF 10V C1 D1 1.5A 20V R1 45.3k R2 10k C2 2 x 22 PF 6.3V Figure 27. LMR10515Y (3MHz): Vin = 5V, Vo = 3.3V @ 1.5A LMR10515Y Design Example 4 FB EN R3 LMR10515 100k VIN GND L1 SW VIN = 5V C1 1.6 PH 2.0A 22 PF 10V D1 1.5A 20V VO = 1.2V @ 1.5A R1 10k R2 10k C2 2 x 22 PF 6.3V Figure 28.
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LMR10515 SNVS728C – OCTOBER 2011 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision B (April 2013) to Revision C • 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 11-Apr-2013 Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
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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) LMR10515XMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 LMR10515XMFE/NOPB SOT-23 DBV 5 250 178.0 LMR10515XMFX/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) LMR10515XMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LMR10515XMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 LMR10515XMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LMR10515XSD/NOPB WSON NGG 6 1000 213.0 191.0 55.0 LMR10515XSDE/NOPB WSON NGG 6 250 213.0 191.0 55.0 LMR10515XSDX/NOPB WSON NGG 6 4500 367.
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MECHANICAL DATA NGG0006A SDE06A (Rev A) www.ti.
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