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LM2830

www.ti.com

SNVS454D –AUGUST 2006–REVISED APRIL 2013

LM2830 High Frequency 1.0A Load - Step-Down DC-DC Regulator

Check for Samples: LM2830

FEATURES

DESCRIPTION

The LM2830 regulator is a monolithic, high frequency,

• LM2830Z-Q1 and LM2830X-Q1 in the SOT-23

PWM step-down DC/DC converter in a 5 pin SOT-23

Package are Automotive Grade Products that

and a 6 Pin WSON package. It provides all the active

are AEC-Q100 Grade 1 Qualified (-40°C to

functions to provide local DC/DC conversion with fast

+125°C Operating Junction Temperature)

transient response and accurate regulation in the

• Space Saving SOT-23 Package

smallest possible PCB area. With a minimum of

external components, the LM2830 is easy to use. The

• Input Voltage Range of 3.0V to 5.5V

ability to drive 1.0A loads with an internal 130 mΩ

• Output Voltage Range of 0.6V to 4.5V

PMOS switch using state-of-the-art 0.5 µm BiCMOS

• 1.0A Output Current

technology results in the best power density

available. The world-class control circuitry allows on-

• High Switching Frequencies

times as low as 30ns, thus supporting exceptionally

– 1.6MHz (LM2830X)

high frequency conversion over the entire 3V to 5.5V

– 3.0MHz (LM2830Z)

input operating range down to the minimum output

• 130mΩ PMOS Switch voltage of 0.6V. Switching frequency is internally set

to 1.6 MHz, or 3.0 MHz, allowing the use of extremely

• 0.6V, 2% Internal Voltage Reference

small surface mount inductors and chip capacitors.

• Internal Soft-Start

Even though the operating frequency is high,

• Current Mode, PWM Operation

efficiencies up to 93% are easy to achieve. External

shutdown is included, featuring an ultra-low stand-by

• Thermal Shutdown

current of 30 nA. The LM2830 utilizes current-mode

• Over Voltage Protection

control and internal compensation to provide high-

performance regulation over a wide range of

APPLICATIONS

operating conditions. Additional features include

internal soft-start circuitry to reduce inrush current,

• Local 5V to Vcore Step-Down Converters

pulse-by-pulse current limit, thermal shutdown, and

• Core Power in HDDs

output over-voltage protection.

• Set-Top Boxes

• USB Powered Devices

• DSL Modems

• Automotive

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 (32 pages)

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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 LM2830 High Frequency 1.0A Load - Step-Down DC-DC Regulator Check for Samples: LM2830 FEATURES DESCRIPTION • The LM2830 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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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com Typical Application Circuit FB EN LM2830 R3 GND L1 VIN VO = 3.3V @ 1.0A SW VIN = 5V R1 C1 D1 C2 C3 R2 Connection Diagrams FB 1 GND 2 SW 3 EN 6 EN DAP 3 FB 2 GND 5 VINA 4 VIND VIN Figure 1. 6-Pin WSON See Package Number NGG 2 4 5 1 SW Figure 2.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 PIN DESCRIPTIONS (5-PIN SOT-23) Pin Name Function 1 SW 2 GND Output switch. 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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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com Electrical Characteristics 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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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 Typical Performance Characteristics All curves taken at VIN = 5.0V with configuration in typical application circuit shown in Applications Information section of this datasheet. TJ = 25°C, unless otherwise specified. η vs Load "X" Vin = 5V, Vo = 1.8V & 3.3V η vs Load "Z" Vin = 5V, Vo = 3.3V & 1.8V Figure 3. Figure 4. η vs Load "X and Z" Vin = 3.3V, Vo = 1.8V Load Regulation Vin = 3.3V, Vo = 1.8V (All Options) Figure 5. Figure 6.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) All curves taken at VIN = 5.0V with configuration in typical application circuit shown in Applications Information section of this datasheet. TJ = 25°C, unless otherwise specified. Oscillator Frequency vs Temperature - "X" Oscillator Frequency vs Temperature - "Z" 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.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 Typical Performance Characteristics (continued) All curves taken at VIN = 5.0V with configuration in typical application circuit shown in Applications Information section of this datasheet. TJ = 25°C, unless otherwise specified. LM2830Z IQ (Quiescent Current) Line Regulation Vo = 1.8V, Io = 500mA 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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LM2830 SNVS454D – AUGUST 2006 – 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 FB S R R Q 1.6 MHz + I SENSE PFET - + DRIVER Internal - Comp SW VREF = 0.6V SOFT - START Internal - LDO GND Figure 20.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 APPLICATIONS INFORMATION THEORY OF OPERATION The LM2830 is a constant frequency PWM buck regulator IC that delivers a 1.0A load current. The regulator has a preset switching frequency of 1.6MHz or 3.0MHz. This high frequency allows the LM2830 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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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com CURRENT LIMIT The LM2830 uses cycle-by-cycle current limiting to protect the output switch. During each switching cycle, a current limit comparator detects if the output switch current exceeds 1.75A (typ), and turns off the switch until the next switching cycle begins. THERMAL SHUTDOWN Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 The LM2830 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 for more details on calculating output voltage ripple.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com inductor to the output. A ceramic capacitor will bypass this noise while a tantalum will not. Since the output capacitor is one of the two external components that control the stability of the regulator control loop, most applications will require a minimum of 22 µF of output capacitance. Capacitance often, but not always, can be increased significantly with little detriment to the regulator stability.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – 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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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com Typical Application power losses are: Table 1. Power Loss Tabulation VIN 5.0V VOUT 3.3V IOUT 1.0A POUT 3.3W PDIODE 150mW VD 0.45V FSW 1.6MHz IQ 3.3mA PQ 17mW TRISE 4nS PSWR 6mW TFALL 4nS PSWF 6mW RDS(ON) 150mΩ PCOND 100mW INDDCR 70mΩ PIND 70mW D 0.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 Silicon Junction Temperature Determination Method 1: To accurately measure the silicon temperature for a given application, two methods can be used. The first method requires the user to know the thermal impedance of the silicon junction to top case temperature. Some clarification needs to be made before we go any further. RθJC is the thermal impedance from all six sides of an IC package to silicon junction.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com WSON Package Figure 23. Internal WSON Connection For certain high power applications, the PCB land may be modified to a "dog bone" shape (see Figure 24). By increasing the size of ground plane, and adding thermal vias, the RθJA for the application can be reduced. FB GND 6 EN 1 2 GND PLANE SW 3 5 VINA 4 VIND Figure 24.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 LM2830X Design Example 1 FB EN LM2830 R3 GND L1 VIN VO = 1.2V @ 1.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 25. LM2830X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.0A Table 2. Bill of Materials Part ID Part Value Manufacturer U1 1.0A Buck Regulator TI Part Number LM2830X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.5A, 30VR TOSHIBA CRS08 L1 3.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2830X Design Example 2 FB EN LM2830 R3 GND L1 VIN VO = 0.6V @ 1.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 26. LM2830X (1.6MHz): Vin = 5V, Vo = 0.6V @ 1.0A Table 3. Bill of Materials 18 Part ID Part Value Manufacturer U1 1.0A Buck Regulator TI Part Number LM2830X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 LM2830X Design Example 3 FB EN LM2830 R3 GND L1 VIN VO = 3.3V @ 1.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 27. LM2830X (1.6MHz): Vin = 5V, Vo = 3.3V @ 1.0A Table 4. Bill of Materials Part ID Part Value Manufacturer U1 1.0A Buck Regulator TI Part Number LM2830X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.5A, 30VR TOSHIBA CRS08 L1 2.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2830Z Design Example 4 FB EN LM2830 R3 GND L1 VIN VO = 3.3V @ 1.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 28. LM2830Z (3MHz): Vin = 5V, Vo = 3.3V @ 1.0A Table 5. Bill of Materials 20 Part ID Part Value Manufacturer U1 1.0A Buck Regulator TI Part Number LM2830Z C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.5A, 30VR TOSHIBA CRS08 L1 1.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 LM2830Z Design Example 5 FB EN LM2830 R3 GND L1 VIN VO = 1.2V @ 1.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 29. LM2830Z (3MHz): Vin = 5V, Vo = 1.2V @ 1.0A Table 6. Bill of Materials Part ID Part Value Manufacturer U1 1.0A Buck Regulator TI Part Number LM2830Z C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.5A, 30VR TOSHIBA CRS08 L1 1.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2830X Dual Converters with Delayed Enabled Design Example 6 VIN U1 C1 VIND R3 VINA L1 VO = 3.3V @ 1.0A SW R1 EN LM2830 D1 C2 R2 GND FB U3 4 R6 3 LP3470M5X-3.08 LP3470 RESET 5 2 1 VIN C7 U2 C3 VIND VINA L2 VO = 1.2V @ 1.0A SW R4 LM2830 D2 C4 EN R5 GND FB Figure 30. LM2830X (1.6MHz): Vin = 5V, Vo = 1.2V @ 1.0A & 3.3V @1.0A Table 7. Bill of Materials 22 Part ID Part Value Manufacturer Part Number U1, U2 1.
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LM2830 www.ti.com SNVS454D – AUGUST 2006 – REVISED APRIL 2013 LM2830X Buck Converter & Voltage Double Circuit with LDO Follower Design Example 7 VO = 5V @ 150mA U2 L2 LDO D2 C6 U1 C3 LM2830 VIN = 5V VIND SW VINA GND C5 C4 L1 R1 C1 VO = 3.3V @ 1.0A EN FB C2 D1 R2 Figure 31. LM2830X (1.6MHz): Vin = 5V, Vo = 3.3V @ 1.0A & LP2986-5.0 @ 150mA Table 8. Bill of Materials Part ID Part Value Manufacturer Part Number U1 1.0A Buck Regulator TI LM2830X U2 200mA LDO TI LP2986-5.
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LM2830 SNVS454D – AUGUST 2006 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D • 24 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 TBD: The Pb-Free/Green conversion plan has not been defined. 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 23-Oct-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) LM2830XMF SOT-23 DBV 5 1000 178.0 8.4 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 3.2 3.2 1.4 4.0 8.0 Q3 LM2830XMF/NOPB SOT-23 DBV 5 1000 178.0 8.4 3.2 3.2 1.4 4.0 8.0 Q3 LM2830XMFX/NOPB SOT-23 DBV 5 3000 178.0 8.4 3.2 3.2 1.4 4.0 8.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2830XMF SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2830XMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2830XMFX/NOPB SOT-23 DBV 5 3000 210.0 185.0 35.0 LM2830XQMF/NOPB SOT-23 DBV 5 1000 210.0 185.0 35.0 LM2830XQMFE/NOPB SOT-23 DBV 5 250 210.0 185.0 35.0 LM2830XQMFX/NOPB SOT-23 DBV 5 3000 210.0 185.
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MECHANICAL DATA NGG0006A SDE06A (Rev A) www.ti.
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