SNVS459A October   2006  – September 2017 LM2853

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  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 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1  Input Capacitor (CIN)
      2. 8.1.2  Soft-Start Capacitor (CSS)
      3. 8.1.3  Soft-Start Capacitor (CSS) and Fault Conditions
      4. 8.1.4  Compensation
      5. 8.1.5  Output Filter Values
      6. 8.1.6  Choosing an Inductance Value
      7. 8.1.7  Output Filter Inductors
      8. 8.1.8  Output Filter Capacitors
      9. 8.1.9  Split-Rail Operation
      10. 8.1.10 Switch Node Protection
    2. 8.2 Typical Application
  9. 9 Layout
    1. 9.1 Layout Guidelines
    2. 9.2 Example Circuit Schematic and Bill of Materials
  10. 10Device and Documentation Support
    1. 10.1 Receiving Notification of Documentation Updates
    2. 10.2 Community Resources
    3. 10.3 Trademarks
    4. 10.4 Electrostatic Discharge Caution
    5. 10.5 Glossary
  11. 11Mechanical, 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)
MIN MAX UNIT
AVIN, PVIN, EN, SNS, SW, SS –0.3 6 V
Power Dissipation Internally Limited V
14-Pin Exposed Pad HTSSOP Package (PWP) Infrared (15 sec) 220 °C
Vapor Phase (60 sec) 215 °C
Soldering (10 sec) 260 °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.

6.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±2 kV
(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) (1)
MIN MAX UNIT
PVIN to GND 1.5 5.5 V
AVIN to GND 3 5.5 V
Operation junction temperature, TJ –40 125 °C

6.4 Thermal Information

THERMAL METRIC(1) LM2853 UNIT
PWP (HTSSOP)
14 PINS
RθJA Junction-to-ambient thermal resistance 38 °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

Specifications with standard typeface are for TJ = 25°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. Unless otherwise specified AVIN = PVIN = 5 V.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SYSTEM PARAMETERS
VOUT Voltage tolerance (2) VOUT = 0.8 V option TJ = –40°C to 125°C 0.782 0.8 0.818 V
VOUT = 1 V option TJ = –40°C to 125°C 0.9775 1 1.0225
VOUT = 1.2 V option TJ = –40°C to 125°C 1.1730 1.2 1.227
VOUT = 1.5 V option TJ = –40°C to 125°C 1.4663 1.5 1.5337
VOUT = 1.8 V option TJ = –40°C to 125°C 1.7595 1.8 1.8405
VOUT = 2.5 V option TJ = –40°C to 125°C 2.4437 2.5 2.5563
VOUT = 3 V option TJ = –40°C to 125°C 2.9325 3 3.0675
VOUT = 3.3 V option TJ = –40°C to 125°C 3.2257 3.3 3.3743
ΔVOUT/ΔAVIN Line regulation (2) VOUT = 0.8 V, 1 V, 1.2 V, 1.5 V, 1.8 V or 2.5 V
3 V ≤ AVIN ≤ 5.5 V		 TJ = –40°C to 125°C 0.2 1.1 %
VOUT = 3 V or 3.3 V
3.5 V ≤ AVIN ≤ 5.5 V		 TJ = –40°C to 125°C 0.2 1.1 %
ΔVOUT/ΔIO Load regulation Normal operation 2 mV/A
VON UVLO Threshold (AVIN) Rising TJ = –40°C to 125°C 2.47 3 V
Falling hysteresis TJ = –40°C to 125°C 50 155 260 mV
RDS(ON)-P PFET On resistance Isw = 3A TJ = –40°C to 125°C 40 120 mΩ
RDS(ON)-N NFET On resistance Isw = 3A TJ = –40°C to 125°C 32 100 mΩ
RSS Soft-Start resistance 450 kΩ
ICL Peak current limit threshold 3.6 5 A
IQ Operating current Non-switching TJ = –40°C to 125°C 0.85 2 mA
ISD Shutdown quiescent current EN = 0 V TJ = –40°C to 125°C 12 50 µA
RSNS Sense pin resistance 432 kΩ
PWM
fosc Switching frequency . TJ = –40°C to 125°C 325 550 725 kHz
Drange Duty cycle range TJ = –40°C to 125°C 0 100 %
ENABLE CONTROL (3)
VIH EN Pin minimum high input TJ = –40°C to 125°C 75 % of AVIN
VIL EN Pin maximum low input TJ = –40°C to 125°C 25 % of AVIN
IEN EN Pin pullup current EN = 0 V 1.5 µA
THERMAL CONTROLS
TSD Thermal shutdown threshold 165 °C
TSD-HYS Hysteresis for thermal shutdown 10 °C
(1) Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating Range indicates conditions for which the device is intended to be functional, but does not ensure specific performance limits. For ensured specifications and test conditions, see the Electrical Characteristics.
(2) VOUT measured in a non-switching, closed-loop configuration at the SNS pin.
(3) The enable pin is internally pulled up, so the LM2853 is automatically enabled unless an external enable voltage is applied.

6.6 Typical Characteristics

LM2853 20201507.png
VOUT = 1.8 V
Figure 1. Efficiency vs ILOAD
LM2853 20201509.png
VOUT = 2.5 V
Figure 3. Efficiency vs ILOAD
LM2853 20201508.png
VOUT = 3.3 V
Figure 5. Efficiency vs ILOAD
LM2853 20201510.png Figure 7. IQ vs VIN and Temperature
LM2853 20201505.png
Figure 2. NFET RDS(ON) vs Temperature
LM2853 20201504.png
Figure 4. PFET RDS(ON) vs Temperature
LM2853 20201506.png
Figure 6. Switching Frequency vs Temperature
LM2853 20201511.png Figure 8. ISD vs VIN and Temperature