SLVSBV4B April   2013  – October 2015 TPS56428

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 PWM Operation
      2. 8.3.2 PWM Frequency and Adaptive On-Time Control
      3. 8.3.3 Advanced Auto-Skip Eco-mode™ Control
      4. 8.3.4 Soft Start and Pre-Biased Soft Start
    4. 8.4 Device Functional Modes
      1. 8.4.1 Power Good
      2. 8.4.2 Output Discharge Control
      3. 8.4.3 Current Protection
      4. 8.4.4 UVLO Protection
      5. 8.4.5 Thermal Shutdown
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Output Filter Selection
        2. 9.2.2.2 Input Capacitor Selection
        3. 9.2.2.3 Bootstrap Capacitor Selection
        4. 9.2.2.4 VREG5 Capacitor Selection
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Information
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

7 Specifications

7.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)(1)
VALUE UNIT
MIN MAX
Input voltage range VIN, EN –0.3 20 V
VBST –0.3 26 V
VBST (10 ns transient) –0.3 28 V
VBST (vs SW) –0.3 6.5 V
VFB, PG –0.3 6.5 V
SW –2 20 V
SW (10 ns transient) –3 22 V
Output voltage range VREG5 –0.3 6.5 V
GND –0.3 0.3 V
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, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 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.

7.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
VIN Supply input voltage range 4.5 18 V
VI Input voltage range VBST –0.1 24 V
VBST (10 ns transient) -0.1 27
VBST(vs SW) –0.1 6.0
PG –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
VO Output voltage range VREG5 –0.1 5.7 V
IO Output Current range IVREG5 0 5 mA
TA Operating free-air temperature –40 85 °C
TJ Operating junction temperature –40 150 °C

7.4 Thermal Information

THERMAL METRIC(1) TPS56428 UNIT
DDA RHL
8 PINS 14 PINS
RθJA Junction-to-ambient thermal resistance 44.4 45.2 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 51.6 50.7 °C/W
RθJB Junction-to-board thermal resistance 27.8 21.4 °C/W
ψJT Junction-to-top characterization parameter 8.7 0.9 °C/W
ψJB Junction-to-board characterization parameter 27.7 21.6 °C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance 5.3 3.5 °C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 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 = 0.7 V		 170 350 μA
IVINSDN Shutdown supply current VIN current, TA = 25°C, EN = 0 V 3.8 10 μA
LOGIC THRESHOLD
VENH EN high-level input voltage EN 1.6 V
VENL EN low-level input voltage EN 0.6 V
REN EN pin resistance to GND VEN = 12 V 180 350 700 kΩ
VFB VOLTAGE AND DISCHARGE RESISTANCE
VFBTH VFB threshold voltage TA = 25°C, VO = 1.05 V, IO = 10 mA,
advanced Eco-mode™ operation		 606 mV
TA = 25°C, VO = 1.05 V, continuous mode operation 593 600 607
TA = –40°C to 85°C , VO = 1.05V, continuous mode operation(1) 588 600 612
IVFB VFB input current VFB = 0.7 V, TA = 25°C 0 ±0.15 µA
SW DISCHARGE
IDischg SW discharge current EN=0V SW=1V, TA = 25°C 1.0 1.5 mA
VREG5 OUTPUT
VVREG5 VREG5 output voltage TA = 25°C, 6.0 V < VIN < 18 V,
0 < IVREG5 < 5 mA		 5.2 5.5 5.7 V
IVREG5 Output current VIN = 6 V, VREG5 = 4.0 V, TA = 25°C 20 mA
MOSFET
RDS(on)h High side switch resistance 25°C, VBST - SW = 5.5 V 68 mΩ
RDS(on)l Low side switch resistance 25°C 37 mΩ
CURRENT LIMIT
Iocl Current limit L out = 1.5 µH (1) 4.8 5.6 7.0 A
THERMAL SHUTDOWN
TSDN Thermal shutdown threshold Shutdown temperature(1) 165 °C
Hysteresis(1) 35
ON-TIME TIMER CONTROL
tON On time VIN = 12 V, VO = 1.05 V 150 ns
tOFF(MIN) Minimum off time TA = 25°C, VFB = 0.5 V 260 310 ns
SOFT START
tss Soft-start time Internal soft-start time 0.7 1.0 1.3 ms
POWER GOOD
VTHPG PG threshold VFB rising(good) 85% 90% 95%
VFB falling(Fault) 85%
IPG IPG PG sink current PG=0.5V 2 4 mA
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
VOVP Output OVP threshold OVP Detect (L>H) 125%
VUVP Output UVP threshold UVP detect (H>L) 65%
tUVPDEL Output UVP delay To Hiccup state 7 µs
tUVPEN Output UVP Enable delay Relative to soft start time x1.7
UVLO
UVLO UVLO threshold Wake up VREG5 voltage 3.45 3.75 4.05 V
Hysteresis VREG5 voltage 0.13 0.32 0.48
(1) Not production tested.

7.6 Typical Characteristics

VIN = 12 V, TA = 25°C (unless otherwise noted)
TPS56428 C004_SLVSBV4.png Figure 1. Supply Current vs Junction Temperature
TPS56428 fig3_SLVSBV4.png Figure 3. EN Current vs EN Voltage
TPS56428 C007_SLVSBV4.png Figure 5. Output Voltage vs Input Voltage
TPS56428 fig2_SLVSBV4.png Figure 2. VIN Shutdown Current vs Junction Temperature
TPS56428 C010_a_SLVSBV4.png Figure 4. Output Voltage vs Output Current
TPS56428 vfb_SLVSBV4.png Figure 6. VFB Voltage vs Junction Temperature