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LMR10530

www.ti.com

SNVS814A –JUNE 2012–REVISED APRIL 2013

LMR10530 SIMPLE SWITCHER

5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10

Check for Samples: LMR10530

FEATURES

DESCRIPTION

The LMR10530 regulator is a monolithic, high

• Input Voltage Range of 3.0V to 5.5V

frequency, PWM step-down DC/DC converter

• Output Voltage Range of 0.6V to 4.5V

available in a 10-pin WSON package. It contains all

• 1.5 MHz (LMR10530X) and 3 MHz (LMR10530Y)

the active functions to provide local DC/DC

Switching Frequencies

conversion with fast transient response and accurate

regulation in the smallest possible PCB area. With a

• WSON-10 (3 x 3 x 0.8 mm) Packaging

minimum of external components, the LMR10530 is

• 3.0A Steady-State Output Current

easy to use. The ability to drive 3.0A loads with an

• Low Shutdown Iq, 300 nA Typical

internal 56 mΩ PMOS switch using state-of-the-art

0.5µm BiCMOS technology results in the best power

• 56mΩ PMOS Switch

density available. The control circuitry allows on-times

• Internal Soft-Start

as low as 30ns, thus supporting exceptionally high

• Internally Compensated Peak Current-Mode

frequency conversion over the entire 3V to 5.5V input

Control

operating range down to the minimum output voltage

of 0.6V. Switching frequency is internally set to

• Cycle-by-cycle Current Limit and Thermal

1.5MHz or 3.0MHz, allowing the use of extremely

Shutdown

small surface mount inductors and capacitors. Even

• WEBENCH

enabled

though the operating frequency is high, efficiencies

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

PERFORMANCE BENEFITS

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

300nA. The LMR10530 utilizes peak current-mode

• Extremely Easy to Use

control and internal compensation to provide high-

• Tiny Overall Solution Reduces System Cost

performance regulation over a wide range of

operating conditions. Additional features include

APPLICATIONS

internal soft-start circuitry to reduce inrush current,

cycle-by-cycle current limit, frequency foldback,

• Point-of-load Conversions from 3.3V and 5V

thermal shutdown, and output over-voltage

Rails

protection.

• Space Constrained Applications

System Performance

Efficiency vs Load Current Efficiency vs Load Current

LMR10530X V

= 5V LMR10530Y V

= 5V

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 (31 pages)

PAGE 1
LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 LMR10530 SIMPLE SWITCHER® 5.5Vin, 3.0A Step-Down Voltage Regulator in WSON-10 Check for Samples: LMR10530 FEATURES DESCRIPTION • • • The LMR10530 regulator is a monolithic, high frequency, PWM step-down DC/DC converter available in a 10-pin WSON package. It contains 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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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com Typical Application Circuit 9,10 VIN SW VIND L1 7,8 VOUT D1 R3 R1 2 EN C1 LMR10530 FB 1 5 C2 VINC NC C3 SGND 3 4 R2 PGND 6 Connection Diagram VINC 1 10 VIND EN 2 9 VIND SGND 3 8 SW NC 4 7 SW FB 5 6 PGND DAP 10-Pin WSON See Package Number DSC PIN DESCRIPTIONS 2 Pin(s) Name Description 1 VINC Input supply for internal bias and control circuitry. Need to locally bypass this pin to GND.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – 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) VINC, VIND -0.5V to 7V FB Voltage -0.5V to 3V EN Voltage -0.5V to VIN+o.3V SW Voltage -0.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com Electrical Characteristics Unless otherwise specified under the Conditions column, VIN = 5V. 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, and are provided for reference purposes only.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified, VIN = 5V and TA = 25°C Efficiency vs Load Current - "LMR10530X" and "LMR10530Y" Efficiency vs Load Current - "LMR10530X" Figure 1. Figure 2. Efficiency vs Load Current - "LMR10530Y" Oscillator Frequency vs Temperature - "LMR10530X" Figure 3. Figure 4. Oscillator Frequency vs Temperature - "LMR10530Y" Current Limit vs Temperature Figure 5. Figure 6.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, VIN = 5V and TA = 25°C RDS(ON) vs Temperature LMR10530X IQ (Switching) Figure 7. Figure 8. LMR10530Y IQ (Switching) VFB vs Temperature Figure 9. Figure 10. Frequency Foldback Figure 11.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, VIN = 5V and TA = 25°C. Loop Gain and Phase - "LMR10530X" Loop Gain and Phase - "LMR10530Y" Figure 12. Figure 13. Load Step Response - "LMR10530X" Line Transient Response - "LMR10530X" Figure 14. Figure 15. Startup by EN - "LMR10530X" Shutdown by EN - "LMR10530X" Figure 16. Figure 17.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, VIN = 5V and TA = 25°C 8 Startup with EN tied to VIN - "LMR10530X" Short-circuit Triggering - "LMR10530X" Figure 18. Figure 19. Short-circuit Release - "LMR10530X" Recovery from Thermal Shutdown - "LMR10530X" Figure 20. Figure 21.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 Block Diagram Figure 22.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com APPLICATION INFORMATION THEORY OF OPERATION The LMR10530 is a constant frequency PWM buck regulator IC that delivers a 3.0A load current. The regulator is available in preset switching frequencies of 1.5MHz or 3.0MHz. This high frequency allows the LMR10530 to operate with small surface mount capacitors and inductors, resulting in a DC/DC converter that requires a minimum amount of board space.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 SOFT-START/SHUTDOWN The LMR10530 has both enable and shutdown modes that are controlled by the EN pin. Connecting a voltage source greater than 1.8V to the EN pin enables the operation of the LMR10530, while reducing this voltage below 0.4V places the part in a low quiescent current (300nA typical) shutdown mode. There is no internal pullup on EN pin, therefore an external signal is required to initiate switching.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com Figure 25. Startup Response to VIN with CFF Figure 26. Startup Response to VIN with 100µs rise time FREQUENCY FOLDBACK The LMR10530 uses frequency foldback to help limit switch current and power dissipation during start-up, shortcircuit and over load conditions by sensing if the feedback voltage is below 0.32V (typical). The LMR10530 will reduce the switching frequency from the nominal fixed value (1.5MHz or 3.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 LOAD STEP RESPONSE The LMR10530 has a fixed internal loop compensation, which results in a small-signal loop bandwidth highly related to the output voltage level. In general, the loop bandwidth at low voltage is larger than at high voltage due to the increased overall loop gain. The limited bandwidth at high output voltage may pose a challenge when loop step response is concerned.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com Figure 28. Loop Gain and Phase without CFF Figure 29.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 Figure 30. Load Step Response without CFF Figure 31. Load Step Response with CFF OUTPUT OVER-VOLTAGE PROTECTION The LMR10530 has a built in output over-voltage comparator that compares the FB pin voltage to a threshold voltage that is 15% higher than the internal reference VREF. Once the FB pin voltage exceeds this threshold level (typically 0.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com CURRENT LIMIT The LMR10530 uses cycle-by-cycle current limiting to protect the internal power switch. During each switching cycle, a current limit comparator detects if the power switch current exceeds 4.4A (typical), and turns off the switch until the next switching cycle begins. THERMAL SHUTDOWN Thermal shutdown limits total power dissipation by turning off the internal power switch when the IC junction temperature typically exceeds 165°C.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 The LMR10530 operates at frequencies allowing the use of ceramic output capacitors without compromising transient response. Ceramic capacitors allow higher inductor ripple without significantly increasing output ripple. See the Output Capacitor section for more details on calculating output voltage ripple.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com larger output capacitance is required to ensure sufficient phase margin. Capacitance can often, but not always, be increased significantly with little detriment to the regulator stability. Like the input capacitor, recommended multilayer ceramic capacitors are X7R or X5R types. Again, verify actual capacitance at the desired operating voltage and temperature. Check the RMS current rating of the capacitor.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 Often this is the single most significant power loss in the circuit. Care should be taken to choose a Schottky diode with a low forward voltage drop. Another significant external power loss is the conduction loss in the output inductor.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com PCB LAYOUT CONSIDERATIONS When planning layout there are a few things to consider to achieve a clean, regulated output. The most important consideration is the close coupling of the GND connections of the input capacitor Cin and the catch diode D1. These ground ends should be close to one another and be connected to the GND plane with at least two through-holes. Place these components as close to the IC as possible.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 LMR10530X Design Example 1 VIN 9,10 SW VIND L1 7,8 VOUT D1 R3 2 1 C1 R1 EN LMR10530X FB VINC C3 NC SGND 5 C2 4 R2 PGND 3 6 Figure 32. LMR10530X (1.5MHz): VIN = 3.3V, Output = 1.2V/3.0A Table 2. Bill of Materials Part ID Part Value Manufacturer Part Number U1 3.0A Buck Regulator TI LMR10530X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5R0J226M C2, Output Cap 47µF, 6.3V, X5R TDK C3216X5R0J476M C3, Bypass Cap 0.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com LMR10530X Design Example 2 Figure 33. LMR10530X (1.5MHz): VIN = 5V, Output = 3.3V/3.0A Table 3. Bill of Materials 22 Part ID Part Value Manufacturer Part Number U1 3.0A Buck Regulator TI LMR10530X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5R0J226M C2, Output Cap 47µF, 6.3V, X5R TDK C3216X5R0J476M C3, Bypass Cap 0.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 LMR10530Y Design Example 3 VIN 9,10 SW VIND L1 7,8 VOUT D1 R3 2 1 C1 R1 EN LMR10530Y FB VINC C3 NC SGND 5 C2 4 R2 PGND 3 6 Figure 34. LMR10530Y (3MHz): VIN = 3.3V, Output = 1.2V/3.0A Table 4. Bill of Materials Part ID Part Value Manufacturer Part Number U1 3.0A Buck Regulator TI LMR10530Y C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5R0J226M C2, Output Cap 47µF, 6.3V, X5R TDK C3216X5R0J476M C3, Bypass Cap 0.
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LMR10530 SNVS814A – JUNE 2012 – REVISED APRIL 2013 www.ti.com LMR10530Y Design Example 4 Figure 35. LMR10530Y (3MHz): VIN = 5V, Output = 3.3V/3.0A Table 5. Bill of Materials 24 Part ID Part Value Manufacturer Part Number U1 3.0A Buck Regulator TI LMR10530Y C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5R0J226M C2, Output Cap 47µF, 6.3V, X5R TDK C3216X5R0J476M C3, Bypass Cap 0.
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LMR10530 www.ti.com SNVS814A – JUNE 2012 – REVISED APRIL 2013 REVISION HISTORY Changes from Original (April 2013) to Revision A • 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.
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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) W Pin1 (mm) Quadrant LMR10530XSD/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LMR10530XSDX/NOPB WSON DSC 10 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LMR10530YSD/NOPB WSON DSC 10 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.
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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) LMR10530XSD/NOPB WSON DSC 10 1000 210.0 185.0 35.0 LMR10530XSDX/NOPB WSON DSC 10 4500 367.0 367.0 35.0 LMR10530YSD/NOPB WSON DSC 10 1000 210.0 185.0 35.0 LMR10530YSDX/NOPB WSON DSC 10 4500 367.0 367.0 35.
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