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Table Of Contents

GND

= 5V

= 3.3V @ 2.0A

LM2832

www.ti.com

SNVS455A –AUGUST 2006–REVISED APRIL 2013

LM2832 High Frequency 2.0A Load - Step-Down DC-DC Regulator

Check for Samples: LM2832

FEATURES

DESCRIPTION

The LM2832 regulator is a monolithic, high frequency,

• Input Voltage Range of 3.0V to 5.5V

PWM step-down DC/DC converter in a 6 Pin WSON

• Output Voltage Range of 0.6V to 4.5V

and a 8 Pin eMSOP-PowerPAD package. It provides

• 2.0A Output Current

all the active functions to provide local DC/DC

conversion with fast transient response and accurate

• High Switching Frequencies

regulation in the smallest possible PCB area. With a

– 1.6MHz (LM2832X)

minimum of external components, the LM2832 is

– 0.55MHz (LM2832Y)

easy to use. The ability to drive 2.0A loads with an

internal 150 mΩ PMOS switch using state-of-the-art

– 3.0MHz (LM2832Z)

0.5 µm BiCMOS technology results in the best power

• 150mΩ PMOS Switch

density available. The world-class control circuitry

• 0.6V, 2% Internal Voltage Reference

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

exceptionally high frequency conversion over the

• Internal Soft-Start

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

• Current Mode, PWM Operation

minimum output voltage of 0.6V. Switching frequency

• Thermal Shutdown

is internally set to 550 kHz, 1.6 MHz, or 3.0 MHz,

• Over Voltage Protection

allowing the use of extremely small surface mount

inductors and chip capacitors. Even though the

operating frequency is high, efficiencies up to 93%

APPLICATIONS

are easy to achieve. External shutdown is included,

• Local 5V to Vcore Step-Down Converters

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

• Core Power in HDDs

LM2832 utilizes current-mode control and internal

compensation to provide high-performance regulation

• Set-Top Boxes

over a wide range of operating conditions. Additional

• USB Powered Devices

features include internal soft-start circuitry to reduce

• DSL Modems

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

shutdown, and output over-voltage protection.

Typical Application Circuit

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 (35 pages)

PAGE 1
LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 LM2832 High Frequency 2.0A Load - Step-Down DC-DC Regulator Check for Samples: LM2832 FEATURES DESCRIPTION • • • • The LM2832 regulator is a monolithic, high frequency, PWM step-down DC/DC converter in a 6 Pin WSON and a 8 Pin eMSOP-PowerPAD 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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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com Connection Diagrams FB 1 GND 2 DAP 6 EN VIND 1 5 VINA VINA 2 8 SW 7 GND DAP SW 3 4 VIND Figure 1. 6-Pin WSON GND 3 6 FB EN 4 5 GND Figure 2. 8-Pin eMSOP-PowerPAD PIN DESCRIPTIONS 8-PIN eMSOP-PowerPAD Pin Name Function 1 VIND Power Input supply. 2 VINA Control circuitry supply voltage. Connect VINA to VIND on PC board. 3, 5, 7 GND Signal and power ground pin.
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LM2832 www.ti.com Absolute Maximum Ratings (1) SNVS455A – AUGUST 2006 – REVISED APRIL 2013 (2) VIN -0.5V to 7V FB Voltage -0.5V to 3V EN Voltage -0.5V to 7V SW Voltage -0.5V to 7V ESD Susceptibility 2kV Junction Temperature (3) 150°C −65°C to +150°C Storage Temperature Soldering Information (1) (2) (3) Infrared or Convection Reflow (15 sec) 220°C Absolute maximum ratings indicate limits beyond which damage to the device may occur.
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LM2832 SNVS455A – 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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LM2832 www.ti.com SNVS455A – 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, Y and Z" Vin = 3.3V, Vo = 1.8V η vs Load "X" Vin = 5V, Vo = 1.8V & 3.3V Figure 3. Figure 4. η vs Load - "Y" Vin = 5V, Vo = 3.3V & 1.8V η vs Load "Z" Vin = 5V, Vo = 3.3V & 1.8V Figure 5. Figure 6.
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LM2832 SNVS455A – 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. Load Regulation Vin = 5V, Vo = 3.3V (All Options) Oscillator Frequency vs Temperature - "X" 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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LM2832 www.ti.com SNVS455A – 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. RDSON vs Temperature (eMSOP-PowerPAD-8 Package) LM2832X IQ (Quiescent Current) 3.6 3.5 IQ (mA) 3.4 3.3 3.2 3.1 3.0 -45 -40 -10 20 50 80 110 125 130 TEMPERATURE (ºC) Figure 15. Figure 16.
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LM2832 SNVS455A – 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. Gain vs Frequency (Vin = 5V, Vo = 1.2V @ 1A) Phase Plot vs Frequency (Vin = 5V, Vo = 1.2V @ 1A) Figure 21. Figure 22.
PAGE 9
LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 APPLICATIONS INFORMATION THEORY OF OPERATION The LM2832 is a constant frequency PWM buck regulator IC that delivers a 2.0A load current. The regulator has a preset switching frequency of 1.6MHz or 3.0MHz. This high frequency allows the LM2832 to operate with small surface mount capacitors and inductors, resulting in a DC/DC converter that requires a minimum amount of board space.
PAGE 10
LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com CURRENT LIMIT The LM2832 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 3.25A (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.
PAGE 11
LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 The LM2832 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.
PAGE 12
LM2832 SNVS455A – AUGUST 2006 – 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 LM2832, there is really no need to review any other capacitor technologies.
PAGE 13
LM2832 www.ti.com SNVS455A – 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.
PAGE 14
LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com Table 1. Power Loss Tabulation VIN 5.0V VOUT 3.3V IOUT 1.75A POUT 5.78W PDIODE 262mW VD 0.45V FSW 550kHz IQ 2.5mA PQ 12.5mW 10mW TRISE 4nS PSWR TFALL 4nS PSWF 10mW RDS(ON) 150mΩ PCOND 306mW INDDCR 50mΩ PIND 153mW D 0.
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LM2832 www.ti.com SNVS455A – 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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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.
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LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 WSON Package Figure 26. Internal WSON Connection For certain high power applications, the PCB land may be modified to a "dog bone" shape (see Figure 27). 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 27.
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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2832X Design Example 1 FB EN LM2832 R3 GND L1 VIN VO = 1.2V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 28. LM2832X (1.6MHz): Vin = 5V, Vo = 1.2V @ 2.0A Table 2. Bill of Materials 18 Part ID Part Value Manufacturer U1 2.0A Buck Regulator TI Part Number LM2832X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.4Vf Schottky 2A, 20VR Diodes Inc.
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LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 LM2832X Design Example 2 FB EN LM2832 R3 GND L1 VIN VO = 0.6V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 29. LM2832X (1.6MHz): Vin = 5V, Vo = 0.6V @ 2.0A Table 3. Bill of Materials Part ID Part Value Manufacturer U1 2.0A Buck Regulator TI Part Number LM2832X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.4Vf Schottky 2A, 20VR Diodes Inc.
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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2832X Design Example 3 FB EN LM2832 R3 GND L1 VIN VO = 3.3V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 30. LM2832X (1.6MHz): Vin = 5V, Vo = 3.3V @ 2.0A Table 4. Bill of Materials 20 Part ID Part Value Manufacturer U1 2.0A Buck Regulator TI Part Number LM2832X C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.4Vf Schottky 2A, 20VR Diodes Inc.
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LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 LM2832Y Design Example 4 FB EN LM2832 R3 GND L1 VIN VO = 3.3V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 31. LM2832Y (550kHz): Vin = 5V, Vout = 3.3V @ 2.0A Table 5. Bill of Materials Part ID Part Value Manufacturer U1 1.5A Buck Regulator TI Part Number LM2832Y C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.
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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2832Y Design Example 5 FB EN LM2832 R3 GND L1 VIN VO = 1.2V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 32. LM2832Y (550kHz): Vin = 5V, Vout = 1.2V @ 2.0A Table 6. Bill of Materials 22 Part ID Part Value Manufacturer U1 1.5A Buck Regulator TI Part Number LM2832Y C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.3Vf Schottky 1.
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LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 LM2832Z Design Example 6 FB EN LM2832 R3 GND L1 VIN VO = 3.3V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 33. LM2832Z (3MHz): Vin = 5V, Vo = 3.3V @ 2.0A Table 7. Bill of Materials Part ID Part Value Manufacturer U1 2.0A Buck Regulator TI Part Number LM2832Z C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.4Vf Schottky 2A, 20VR Diodes Inc. B220/A L1 3.
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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2832Z Design Example 7 FB EN LM2832 R3 GND L1 VIN VO = 1.2V @ 2.0A SW VIN = 5V R1 C1 D1 C2 R2 Figure 34. LM2832Z (3MHz): Vin = 5V, Vo = 1.2V @ 2.0A Table 8. Bill of Materials 24 Part ID Part Value Manufacturer U1 2.0A Buck Regulator TI Part Number LM2832Z C1, Input Cap 22µF, 6.3V, X5R TDK C3216X5ROJ226M C3216X5ROJ226M C2, Output Cap 2x22µF, 6.3V, X5R TDK D1, Catch Diode 0.4Vf Schottky 2A, 20VR Diodes Inc.
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LM2832 www.ti.com SNVS455A – AUGUST 2006 – REVISED APRIL 2013 LM2832X Dual Converters with Delayed Enabled Design Example 8 VIN U1 C1 R3 VIND VINA L1 VO = 3.3V @ 2.0A SW EN R1 D1 LM2832 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 @ 2.0A SW R4 LM2832 D2 C4 R5 EN GND FB Figure 35. LM2832X (1.6MHz): Vin = 5V, Vo = 1.2V @ 2.0A & 3.3V @2.0A Table 9. Bill of Materials Part ID Part Value Manufacturer Part Number U1, U2 2.
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LM2832 SNVS455A – AUGUST 2006 – REVISED APRIL 2013 www.ti.com LM2832X Buck Converter & Voltage Double Circuit with LDO Follower Design Example 9 VO = 5.0V @ 150mA L2 U2 LDO D2 C6 U1 C3 LM2832 VIN = 5V VIND SW VINA GND C1 EN C5 C4 L1 R1 FB VO = 3.3V @ 2.0A C2 D1 R2 Figure 36. LM2832X (1.6MHz): Vin = 5V, Vo = 3.3V @ 2.0A & LP2986-5.0 @ 150mA Table 10. Bill of Materials 26 Part ID Part Value Manufacturer Part Number U1 2.0A Buck Regulator TI LM2832X U2 200mA LDO TI LP2986-5.
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LM2832 www.ti.com SNVS455A – AUGUST 2006 – 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.com 1-Nov-2013 (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-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 LM2832XMY MSOPPower PAD DGN 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM2832XMY/NOPB MSOPPower PAD DGN 8 1000 178.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM2832XMYX/NOPB MSOPPower PAD DGN 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 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 LM2832ZMYX/NOPB MSOPPower PAD DGN 8 3500 330.0 12.4 5.3 3.4 1.4 8.0 12.0 Q1 LM2832ZSD/NOPB WSON NGG 6 1000 178.0 12.4 3.3 3.3 1.0 8.0 12.0 Q1 LM2832ZSDX/NOPB WSON NGG 6 4500 330.0 12.4 3.3 3.3 1.0 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2832ZSDX/NOPB WSON NGG 6 4500 367.0 367.0 35.
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MECHANICAL DATA DGN0008A MUY08A (Rev A) BOTTOM VIEW www.ti.
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MECHANICAL DATA NGG0006A SDE06A (Rev A) www.ti.
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