Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder HTSSOP 14

PVIN

AVIN

SGND

PGND

SNS

LM2852Y

= 2.7 nF

= 22 PF

= 3.3V

OUT

= 2.5V

LOAD

= 0A to 2A

= 100 PF

= 10 PH

LM2852

www.ti.com

SNVS325D –JANUARY 2005–REVISED APRIL 2013

LM2852 2A 500/1500kHz Synchronous SIMPLE SWITCHER® Buck Regulator

Check for Samples: LM2852

FEATURES

DESCRIPTION

The LM2852 SIMPLE SWITCHER® synchronous

• Input Voltage Range of 2.85 to 5.5V

buck regulator is a high frequency step-down

• Factory EEPROM Set Output Voltages from

switching voltage regulator capable of driving up to a

0.8V to 3.3V in 100mV Increments

2A load with excellent line and load regulation. The

• Maximum Load Current of 2A

LM2852 can accept an input voltage between 2.85V

and 5.5V and deliver an output voltage that is factory

• Voltage Mode Control

programmable from 0.8V to 3.3V in 100mV

• Internal Type-Three Compensation

increments. The LM2852 is available with a choice of

• Switching Frequency of 500kHz or 1.5MHz

two switching frequencies - 500kHz (LM2852Y) or

1.5MHz (LM2852X). It also features internal, type-

• Low Standby Current of 10µA

three compensation to deliver a low component count

• Internal 60 mΩ MOSFET Switches

solution. The exposed-pad HTSSOP-14 package

• Standard Voltage Options

enhances the thermal performance of the LM2852.

0.8/1.0/1.2/1.5/1.8/2.5/3.3 Volts

APPLICATIONS

• Low Voltage Point of Load Regulation

• Local Solution for FPGA/DSP/ASIC Core

Power

• Broadband Networking and Communications

Infrastructure

• Portable Computing

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 (23 pages)

PAGE 1
LM2852 www.ti.com SNVS325D – JANUARY 2005 – REVISED APRIL 2013 LM2852 2A 500/1500kHz Synchronous SIMPLE SWITCHER® Buck Regulator Check for Samples: LM2852 FEATURES DESCRIPTION • • The LM2852 SIMPLE SWITCHER® synchronous buck regulator is a high frequency step-down switching voltage regulator capable of driving up to a 2A load with excellent line and load regulation. The LM2852 can accept an input voltage between 2.85V and 5.5V and deliver an output voltage that is factory programmable from 0.8V to 3.
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LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.com Figure 1. Efficiency vs ILOAD 96 PVIN = 3.3V EFFICIENCY (%) 94 92 90 88 86 84 0.1 1.0 10 ILOAD (A) Connection Diagram AVIN 1 14 SNS EN 2 13 NC SGND 3 12 NC 11 PGND LM2852 SS 4 NC 5 10 PGND PVIN 6 9 SW PVIN 7 8 SW Figure 2. 14-Pin HTSSOP – Top View See Package Number PWP0014A PIN DESCRIPTIONS AVIN (Pin 1): Chip bias input pin. This provides power to the logic of the chip.
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LM2852 www.ti.com SNVS325D – JANUARY 2005 – 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) −0.3V to 6.5V PVIN, AVIN, EN, SNS ESD Susceptibility (3) 2kV Power Dissipation Internally Limited Storage Temperature Range −65°C to +150°C Maximum Junction Temp.
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LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.com Electrical Characteristics AVIN = PVIN = 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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LM2852 www.ti.com SNVS325D – JANUARY 2005 – REVISED APRIL 2013 LM2852Y Typical Performance Characteristics (500kHz) Efficiency vs ILoad VOUT = 1.5V Efficiency vs ILoad VOUT = 2.5V 92 96 PVIN = 3.3V PVIN = 3.3V 90 94 86 84 92 EFFICIENCY (%) EFFICIENCY (%) 88 PVIN = 5.0V 82 90 PVIN = 5.0V 88 80 86 78 84 76 0.1 1.0 0.1 10 1.0 10 ILOAD (A) ILOAD (A) Figure 3. Figure 4. Efficiency vs ILoad VOUT = 3.3V Frequency vs Temperature 95 560 94 550 VIN = 3.3V PVIN = 5.
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LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.com LM2852X Typical Performance Characteristics (1500kHz) Efficiency vs ILoad VOUT = 1.5V Efficiency vs ILoad VOUT = 2.5V 100 85 PVIN = 3.3V PVIN = 3.3V 80 90 70 65 60 80 EFFICIENCY (%) EFFICIENCY (%) 75 PVIN = 5.0V PVIN = 5.0V 70 60 55 50 50 45 0.1 1.0 40 0.1 10 ILOAD (A) Figure 7. Figure 8. Efficiency vs ILoad VOUT = 3.3V Frequency vs Temperature 1600 85 1550 FREQUENCY (kHz) EFFICIENCY (%) 80 PVIN = 5.
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LM2852 www.ti.com SNVS325D – JANUARY 2005 – REVISED APRIL 2013 LM2852 Typical Performance Characteristics (Both Y and X Versions) Shutdown Current vs VIN Quiescent Current (Non-Switching) vs VIN 1100 17 1000 15 125oC 900 13 o 85 C IQ (PA) IQ SHUTDOWN (PA) 125oC 11 o 800 85oC 25 C 25oC 700 9 -40oC 7 5 2.5 3 3.5 4 4.5 5 -40oC 600 500 2.5 5.5 3 3.5 4 4.5 5 5.5 VIN (V) VIN (V) Figure 11. Figure 12.
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LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.
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LM2852 www.ti.com SNVS325D – JANUARY 2005 – REVISED APRIL 2013 APPLICATIONS INFORMATION The LM2852 is a DC-DC synchronous buck regulator belonging to Texas Instrument’s SIMPLE SWITCHER family. Integration of the PWM controller, power switches and compensation network greatly reduces the component count required to implement a switching power supply. A typical application requires only four components: an input capacitor, a soft-start capacitor, an output filter capacitor and an output filter inductor.
PAGE 10
LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.com COMPENSATION The LM2852 provides a highly integrated solution to power supply design. The compensation of the LM2852, which is type-three, is included on-chip. The benefit to integrated compensation is straightforward, simple power supply design. Since the output filter capacitor and inductor values impact the compensation of the control loop, the range of L, C and CESR values is restricted in order to ensure stability.
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LM2852 www.ti.com SNVS325D – JANUARY 2005 – REVISED APRIL 2013 CHOOSING AN INDUCTANCE VALUE The current ripple present in the output filter inductor is determined by the input voltage, output voltage, switching frequency and inductance according to the following equation: 'IL = D x (VIN - VOUT) fxL where • • • • • • ΔIL is the peak-to-peak current ripple. D is the duty cycle VOUT/VIN. VIN is the input voltage applied to the PVIN pin. VOUT is the output voltage of the switcher.
PAGE 12
LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.com OUTPUT FILTER CAPACITORS The capacitors that may be used in the output filter with the LM2852 are limited in value and ESR range according to Table 1. Below are some examples of capacitors that can typically be used in an LM2852 application. Table 3.
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LM2852 www.ti.com SNVS325D – JANUARY 2005 – REVISED APRIL 2013 2. All ground connections must be tied together. Use a broad ground plane, for example a completely filled back plane, to establish the lowest resistance possible between all ground connections. 3. The sense pin connection should be made as close to the load as possible so that the voltage at the load is the expected regulated value.
PAGE 14
LM2852 SNVS325D – JANUARY 2005 – REVISED APRIL 2013 www.ti.com REVISION HISTORY Changes from Revision C (April 2013) to Revision D • 14 Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2852XMXA-0.8/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 0.8 LM2852XMXA-1.0/NOPB ACTIVE HTSSOP PWP 14 94 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852X 1.0 LM2852XMXA-1.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2852XMXAX-2.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852XMXAX-3.0/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM LM2852XMXAX-3.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2852YMXAX-1.3/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM 2852Y 1.3 LM2852YMXAX-1.5/NOPB ACTIVE HTSSOP PWP 14 2500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 2852Y -1.5 LM2852YMXAX-1.
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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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 LM2852XMXAX-0.8/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2852XMXAX-1.0/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2852XMXAX-1.2/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.
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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 LM2852YMXAX-1.2/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2852YMXAX-1.3/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2852YMXAX-1.5/NOP HTSSOP B PWP 14 2500 330.0 12.4 6.95 8.3 1.6 8.0 12.0 Q1 LM2852YMXAX-1.
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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) LM2852XMXAX-2.5 HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-2.5/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-3.0/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852XMXAX-3.3/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-0.8/NOPB HTSSOP PWP 14 2500 367.0 367.0 35.0 LM2852YMXAX-1.0/NOPB HTSSOP PWP 14 2500 367.
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MECHANICAL DATA PWP0014A MXA14A (Rev A) www.ti.
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