SNVS325E January   2005  – January 2016 LM2852

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1. 3.1 Efficiency vs ILOAD
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 LM2852Y Typical Characteristics (500 kHz)
    7. 6.7 LM2852X Typical Characteristics (1500 kHz)
    8. 6.8 LM2852 Typical Characteristics (Both Y and X Versions)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Split-Rail Operation
      2. 7.3.2 Switch Node Protection
    4. 7.4 Device Functional Modes
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Input Capacitor (CIN)
        2. 8.2.2.2 Soft-Start Capacitor (CSS)
        3. 8.2.2.3 Soft-Start Capacitor (CSS) and Fault Conditions
        4. 8.2.2.4 Compensation
        5. 8.2.2.5 Output Filter Values
        6. 8.2.2.6 Choosing an Inductance Value
        7. 8.2.2.7 Output Filter Inductors
        8. 8.2.2.8 Output Filter Capacitors
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)(2)
MIN MAX UNIT
PVIN, AVIN, EN, SNS 6.5 V
Power dissipation Internally limited
14-Pin exposed pad HTSSOP package Infrared (15 sec) 220 °C
Vapor phase (60 sec) 215 °C
Maximum junction temperature 150 °C
Storage temperature, Tstg −65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and specifications.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2000 V
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
PVIN to GND 1.5 5.5 V
AVIN to GND 2.85 5.5 V
Junction temperature −40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) LM2852 UNIT
PWP (HTTSOP)
14 PINS
RθJA Junction-to-ambient thermal resistance 39.2 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 24.1 °C/W
RθJB Junction-to-board thermal resistance 20.1 °C/W
ψJT Junction-to-top characterization parameter 0.6 °C/W
ψJB Junction-to-board characterization parameter 19.8 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 1.7 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report.

6.5 Electrical Characteristics

AVIN = PVIN = 5 V unless otherwise indicated under the Test Conditions column. Limits apply over the junction temperature (TJ) range of –40°C to 125°C (unless otherwise noted). 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.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SYSTEM PARAMETERS
VOUT Voltage
tolerance(1)		 VOUT = 0.8-V option 0.782 0.818 V
VOUT = 1-V option 0.9775 1.0225
VOUT = 1.2-V option 1.173 1.227
VOUT = 1.5-V option 1.4663 1.5337
VOUT = 1.8-V option 1.7595 1.8405
VOUT = 2.5-V option 2.4437 2.5563
VOUT = 3-V option 2.9325 3.0675
VOUT = 3.3-V option 3.2257 3.3743
ΔVOUT/ ΔAVIN Line regulation(1) VOUT = 0.8 V, 1 V, 1.2 V, 1.5 V, 1.8 V or 2.5 V,
2.85 V ≤ AVIN ≤ 5.5 V		 TJ = –40°C to 125°C 0.6%
TJ = 25°C 0.2%
VOUT = 3.3 V,
3.5 V ≤ AVIN ≤ 5.5 V		 TJ = –40°C to 125°C 0.6%
TJ = 25°C 0.2%
ΔVOUT/ΔIO Load regulation Normal operation TJ = 25°C 8 mV/A
VON UVLO threshold (AVIN) Rising TJ = –40°C to 125°C 2.85 V
TJ = 25°C 2.47
Falling hysteresis TJ = –40°C to 125°C 85 210 mV
TJ = 25°C 150
rDSON-P PFET ON resistance Isw = 2 A TJ = –40°C to 125°C 140 mΩ
TJ = 25°C 75
rDSON-N NFET ON resistance Isw = 2 A TJ = –40°C to 125°C 120 mΩ
TJ = 25°C 55
RSS Soft-start resistance TJ = 25°C 400 kΩ
ICL Peak current limit threshold LM2852X TJ = –40°C to 125°C 2.75 4.95 A
TJ = 25°C 4
LM2852Y TJ = –40°C to 125°C 2.25 3.65
TJ = 25°C 3
IQ Operating current Non-switching TJ = –40°C to 125°C 2 mA
TJ = 25°C 0.85
ISD Shutdown quiescent current EN = 0 V TJ = –40°C to 125°C 25 µA
TJ = 25°C 10
RSNS Sense pin resistance TJ = 25°C 400 kΩ
PWM
fosc LM2852X 1500-kHz option. TJ = –40°C to 125°C 1050 1825 kHz
TJ = 25°C 1500
LM2852Y 500-kHz option. TJ = –40°C to 125°C 325 625 kHz
TJ = 25°C 500
Drange Duty cycle 0% 100%
ENABLE CONTROL(2)
VIH EN pin minimum high input 75 % of AVIN
VIL EN pin maximum low input 25 % of AVIN
IEN EN pin pullup current EN = 0 V TJ = 25°C 1.2 µA
THERMAL CONTROLS
TSD TJ for thermal shutdown TJ = 25°C 165 °C
TSD-HYS Hysteresis for thermal shutdown TJ = 25°C 10 °C
(1) VOUT measured in a non-switching, closed-loop configuration at the SNS pin.
(2) The enable pin is internally pulled up, so the LM2852 is automatically enabled unless an external enable voltage is applied.

6.6 LM2852Y Typical Characteristics (500 kHz)

LM2852 20127004.gif Figure 1. Efficiency vs ILoad VOUT = 1.5 V
LM2852 20127006.gif Figure 3. Efficiency vs ILoad VOUT = 3.3 V
LM2852 20127024.gif Figure 2. Efficiency vs ILoad VOUT = 2.5 V
LM2852 20127009.gif Figure 4. Frequency vs Temperature

6.7 LM2852X Typical Characteristics (1500 kHz)

LM2852 20127025.gif Figure 5. Efficiency vs ILoad VOUT = 1.5 V
LM2852 20127027.gif Figure 7. Efficiency vs ILoad VOUT = 3.3 V
LM2852 20127026.gif Figure 6. Efficiency vs ILoad VOUT = 2.5 V
LM2852 20127028.gif Figure 8. Frequency vs Temperature

6.8 LM2852 Typical Characteristics (Both Y and X Versions)

LM2852 20127010.gif Figure 9. NMOS Switch RDSON vs Temperature
LM2852 20127011.gif Figure 10. PMOS Switch RDSON vs Temperature