SLVSAY5D July   2011  – August 2016 TPS54527

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 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Soft Start and Pre-Biased Soft Start
      2. 7.3.2 Current Protection
      3. 7.3.3 UVLO Protection
      4. 7.3.4 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Operation
      2. 7.4.2 PWM Frequency and Adaptive On-Time Control
  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 Output Voltage Resistors Selection
        2. 8.2.2.2 Output Filter Selection
        3. 8.2.2.3 Input Capacitor Selection
        4. 8.2.2.4 Bootstrap Capacitor Selection
        5. 8.2.2.5 VREG5 Capacitor Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Consideration
  11. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 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)
MIN MAX UNIT
Input voltage VIN, EN –0.3 20 V
VBST –0.3 26
VBST (10-ns transient) –0.3 28
VBST (vs SW) –0.3 6.5
VFB, SS –0.3 6.5
SW –2 20
SW (10-ns transient) –3 22
Output voltage VREG5 –0.3 6.5 V
GND –0.3 0.3
Voltage from GND to thermal pad, Vdiff –0.2 0.2 V
Operating junction temperature, TJ –40 150 °C
Storage temperature, Tstg –55 150 °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) ±2000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM 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
VIN Supply input voltage 4.5 18 V
Input voltage VBST –0.1 24 V
VBST (10 ns transient) –0.1 27
VBST(vs SW) –0.1 5.7
SS –0.1 5.7
EN –0.1 18
VFB –0.1 5.5
SW –1.8 18
SW (10 ns transient) –3 21
GND –0.1 0.1
VOUT Output voltage VREG5 –0.1 5.7 V
IOUT Output current IVREG5 0 5 mA
TA Operating free-air temperature –40 85 °C
TJ Operating junction temperature –40 150 °C

6.4 Thermal Information

THERMAL METRIC(1) TPS54527 UNIT
DDA (SO PowerPAD)
8 PINS
RθJA Junction-to-ambient thermal resistance 43.5 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 49.4 °C/W
RθJB Junction-to-board thermal resistance 25.6 °C/W
ψJT Junction-to-top characterization parameter 7.4 °C/W
ψJB Junction-to-board characterization parameter 25.5 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 5.2 °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

over operating free-air temperature range, VIN = 12 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
IVIN Operating non-switching supply current VIN current, TA = 25°C, EN = 5 V, VFB = 0.8 V 900 1400 µA
IVINSDN Shutdown supply current VIN current, TA = 25°C, EN = 0 V 3.6 10 µA
LOGIC THRESHOLD
VENH EN high-level input voltage EN 1.6 V
VENL EN low-level input voltage EN 0.6 V
VFB VOLTAGE AND DISCHARGE RESISTANCE
VFBTH VFB threshold voltage TA = 25°C, VOUT = 1.05 V, continuous mode 757 765 773 mV
TA = –40°C to 85°C , VOUT = 1.05 V, continuous mode(1) 751 765 779 mV
IVFB VFB input current VFB = 0.8 V, TA = 25°C 0 ±0.15 µA
VREG5 OUTPUT
VREG5 VREG5 output voltage TA = 25°C, 6 V < VIN < 18 V, 0 < IVREG5 < 5 mA 5.2 5.5 5.7 V
VLN5 Line regulation 6 V < VIN < 18 V, IVREG5 = 5 mA 25 mV
VLD5 Load regulation 0 mA < IVREG5 < 5 mA 100 mV
IVREG5 Output current VIN = 6 V, VREG5 = 4 V, TA = 25°C 60 mA
MOSFET
RDS(ON)H High side switch resistance TA = 25°C, VBST – SW = 5.5 V 65 mΩ
RDS(ON)L Low side switch resistance TA = 25°C 36 mΩ
CURRENT LIMIT
Iocl Current limit L out = 1.5 µH(1) 5.6 6.4 7.9 A
THERMAL SHUTDOWN
TSDN Thermal shutdown threshold Shutdown temperature (1) 165 °C
Hysteresis (1) 35
SOFT START
ISSC SS charge current VSS = 1 V 4.2 6 7.8 µA
ISSD SS discharge current VSS = 0.5 V 0.1 0.2 mA
UVLO
UVLO UVLO threshold Wake up VREG5 voltage 3.45 3.75 4.05 V
Hysteresis VREG5 voltage 0.19 0.32 0.45
(1) Not production tested.

6.6 Timing Requirements

MIN NOM MAX UNIT
ON-TIME TIMER CONTROL
tON ON time VIN = 12 V, VOUT = 1.05 V 150 ns
tOFF(MIN) Minimum OFF time TA = 25°C, VFB = 0.7 V 260 330 ns

6.7 Typical Characteristics

VIN = 12 V, TA = 25°C (unles otherwise noted)
TPS54527 supcur_tj_lvsay5.gif Figure 1. VIN Current vs Junction Temperature
TPS54527 cur_vi_lvsay5.gif Figure 3. EN Current vs EN Voltage
TPS54527 vo_io_lvsay5.gif Figure 5. 1.05-V Output Voltage vs Output Current
TPS54527 eff_io_lvsay5.gif Figure 7. Efficiency vs Output Current
TPS54527 fsw_io_lvsay5.gif Figure 9. Switching Frequency vs Output Current
TPS54527 sdown_cur_lvsay5.gif Figure 2. VIN Shutdown Current vs Junction Temperature
TPS54527 vfb_tj_lvsay5.gif Figure 4. VFB Voltage vs Junction Temperature
TPS54527 vo_vi_lvsay5.gif Figure 6. 1.05-V Output Voltage vs Input Voltage
TPS54527 fsw_vi_lvsay5.gif Figure 8. Switching Frequency vs Input Voltage