SLUS909B May   2009  – August 2014 TPS53126

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematics
  5. 5 Revision History
  6. 6 Pin Configurations and Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 Handling Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 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  Drivers
      3. 8.3.3  PWM Frequency And Adaptive On-time Control
      4. 8.3.4  5 Volt Regulator
      5. 8.3.5  Soft Start
      6. 8.3.6  Pre-Bias Support
      7. 8.3.7  Switching Frequency Selection
      8. 8.3.8  Output Discharge Control
      9. 8.3.9  Overcurrent Limit
      10. 8.3.10 Over/under Voltage Protection
      11. 8.3.11 UVLO Protection
      12. 8.3.12 Thermal Shutdown
    4. 8.4 Device Functional Modes
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 350 kHz Operation Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Choose Inductor
        2. 9.2.2.2 Choose Output Capacitor
        3. 9.2.2.3 Choose Input Capacitor
        4. 9.2.2.4 Choose Bootstrap Capacitor
        5. 9.2.2.5 Choose VREG5 and V5FILT Capacitors
        6. 9.2.2.6 Choose Output Voltage Set Point Resistors
        7. 9.2.2.7 Choose Over Current Limit Set Point Resistors
      3. 9.2.3 350 kHz Application Curves
    3. 9.3 700 Khz Operation Application
      1. 9.3.1 Design Parameters
      2. 9.3.2 Detailed Design Procedure
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Trademarks
    2. 12.2 Electrostatic Discharge Caution
    3. 12.3 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RGE|24
  • PW|24
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)
MIN MAX UNIT
Input voltage VIN, EN1, EN2 –0.3 26 V
VBST1, VBST2 –0.3 32
VBST1, VBST2 (wrt SWx) –0.3 6
V5FILT, VFB1, VFB2, TRIP1, TRIP2, VO1, VO2, TEST1, TEST2 –0.3 6
SW1, SW2 –2 26
Output voltage DRVH1, DRVH2 –1 32 V
DRVH1, DRVH2 (wrt SWx) –0.3 6
DRVL1, DRVL2, VREG5 –0.3 6
PGND1, PGND2 –0.3 0.3
TA Operating ambient temperature range –40 85 °C
TJ Junction temperature range –40 150 °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.

7.2 Handling Ratings

MIN MAX UNIT
Tstg Storage temperature range –55 150 °C
V(ESD) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001, all pins(1) –2000 2000 V
Charged device model (CDM), per JEDEC specification JESD22-C101, all pins(2) –500 500
(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

MIN MAX UNIT
Supply input voltage range VIN 4.5 24 V
V5FILT 4.5 5.5
Input voltage range VBST1, VBST2 –0.1 30 V
VBST1, VBST2 (wrt SWx) –0.1 5.5
VFB1, VFB2, VO1, VO2, TEST1, TEST2 –0.1 5.5
TRIP1, TRIP2 –0.1 0.3
EN1, EN2 –0.1 24
SW1, SW2 –1.8 24
Output voltage range DRVH1, DRVH2 –0.1 30 V
VBST1, VBST2 (wrt SWx) –0.1 5.5
DRVL1, DRVL2, VREG5 –0.1 5.5
PGND1, PGND2 –0.1 0.1
TA Operating free-air temperature –40 85 °C
TJ Operating junction temperature –40 125 °C

7.4 Thermal Information

THERMAL METRIC(1) TPS53126 UNIT
PW (24 PINS) RGE( 24 PINS)
RθJA Junction-to-ambient thermal resistance 88.9 35.4 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 26.5 39.1
RθJB Junction-to-board thermal resistance 43.5 13.6
ψJT Junction-to-top characterization parameter 1.1 0.5
ψJB Junction-to-board characterization parameter 43.0 13.6
RθJC(bot) Junction-to-case (bottom) thermal resistance n/a 3.8
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

over recommended free-air temperature range, VIN = 12 V (Unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
IIN VIN supply current VIN current, TA = 25°C, VREG5 tied to V5FLT, EN1 = EN2 = 5V, VFB1 = VFB2 = 0.8V, SW1 = SW2 = 0.5V 450 800 μA
IVINSDN VIN shutdown current VIN current, TA = 25°C, No load, EN1 = EN2 = 0 V, VREG5 = ON 30 60 μA
VFB VOLTAGE and DISCHARGE RESISTANCE
VBG Bandgap initial regulation accuracy TA = 25°C -1.0% 1.0%
VVFBTHLx VFBx threshold voltage TA = 25°C, TEST2 = 0 V, SWinj = OFF 755 765 775 mV
TA = –40°C to 85°C, TEST2 = 0 V, SWinj = OFF(1) 752 778
VVFBTHHx VFBx threshold voltage TA = 25°C, TEST2 = V5FILT, SWinj = OFF 748 758 768 mV
TA = –40°C to 85°C, TEST2 = V5FILT, SWinj = OFF(1) 745 771
IVFB VFB input current VFBx = 0.8 V, TA = 25°C –0.01 ±0.1 μA
RDischg VO discharge resistance ENx = 0 V, VOx = 0.5 V, TA = 25°C 40 80 Ω
VREG5 OUTPUT
VVREG5 VREG5 output voltage TA = 25°C, 5.5 V < VIN < 24 V,
0 < IVREG5 < 10 mA		 4.6 5.0 5.2 V
VLN5 Line regulation 5.5 V < VIN < 24 V, IVREG5 = 10 mA 20 mV
VLD5 Load regulation 1 mA < IVREG5 < 10 mA 40 mV
IVREG5 Output current VIN = 5.5 V, VVREG5 = 4 V, TA = 25°C 170 mA
OUTPUT: N-CHANNEL MOSFET GATE DRIVERS
RDRVH DRVH resistance Source, IDRVHx = –100 mA 5.5 11 Ω
Sink, IDRVHx = 100 mA 2.5 5
RDRVL DRVL resistance Source, IDRVLx = –100 mA 4 12 Ω
Sink, IDRVLx = 100 mA 2 4
INTERNAL BOOST DIODE
VFBST Forward voltage VVREG5-VBSTx, IF = 10 mA, TA = 25°C 0.7 0.8 0.9 V
IVBSTLK VBST leakage current VBSTx = 29 V, SWx = 24 V, TA = 25°C 0.1 1 μA
SOFT START
Tss Internal SS time Internal soft start VFBx = 0.735 V 0.85 1.2 1.4 ms
UVLO
VUV5VFILT V5FILT UVLO threshold Wake up 3.7 4.0 4.3 V
Hysteresis 0.2 0.3 0.4
LOGIC THRESHOLD
VENH ENx H-level input voltage EN ½ 2.0 V
VENL ENx L-level input voltage EN ½ 0.3 V
CURRENT SENSE
ITRIP TRIP source current VTRIPx = 0.1 V, TA = 25°C 8.5 10 11.5 μA
TCITRIP ITRIP temperature coefficient On the basis of 25°C(1) 4000 ppm/°C
VOCLoff OCP compensation offset (VTRIPx-GND-VPGNDx-SWx) voltage,
VTRIPx-GND = 60 mV, TA = 25°C		 –15 0 15 mV
(VTRIPx-GND-VPGNDx-SWx) voltage,
VTRIPx-GND = 60 mV		 –20 20
VRtrip Current limit threshold setting range VTRIPx-GND voltage 30 300 mV
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
VOVP Output OVP trip threshold OVP detect 110% 115% 120%
VUVP Output UVP trip threshold UVP detect 65% 70% 75%
Hysteresis (recovery < 20 μs) 10%
THERMAL SHUTDOWN
TSDN Thermal shutdown threshold Shutdown temperature(1) 150 °C
Hysteresis(1) 20
(1) Ensured by design. Not production tested.

7.6 Timing Requirements

TEST CONDITIONS MIN TYP MAX UNIT
OUTPUT: N-CHANNEL MOSFET GATE DRIVERS
tD Dead time DRVHx-low to DRVLx-on 20 50 80 ns
DRVLx-low to DRVHx-on 20 40 80
OUTPUT UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
tOVPDEL Output OVP prop delay time 1.5 μs
tUVPDEL Output UVP delay time 17 30 40 μs
tUVPEN Output UVP enable delay time UVP enable delay 1.2 2 2.5 ms

7.7 Switching Characteristics

over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
ON-TIME TIMER CONTROL
tON1L CH1 on time SW1 = 12 V, VO1 = 1.8 V, TEST2 = 0 V 490 ns
tON2L CH2 on time SW2 = 12 V, VO2 = 1.8 V, TEST2 = 0 V 390 ns
tOFF1L CH1 min off time SW1 = 0.7 V, TA = 25°C, VFB1 = 0.7 V, TEST2 = 0 V 285 ns
tOFF2L CH2 min off time SW2 = 0.7 V, TA = 25°C, VFB2 = 0.7 V, TEST2 = 0 V 285 ns
tON1H CH1 on time SW1 = 12 V, VO1 = 1.8 V, TEST2 = V5FILT 165 ns
tON2H CH2 on time SW2 = 12 V, VO2 = 1.8 V, TEST2 = V5FILT 140 ns
tOFF1H CH1 min off time SW1 = 0.7 V, TA = 25°C, VFB1 = 0.7 V, TEST2 = V5FILT 216 ns
tOFF2H CH2 min off time SW2 = 0.7 V, TA = 25°C, VFB2 = 0.7 V, TEST2 = V5FILT 216 ns

7.8 Typical Characteristics

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Figure 1. VIN Supply Current vs Junction Temperature
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Figure 3. Trip Source Current vs Junction Temperature
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Figure 5. VREG5 Voltage vs Input Voltage
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CH2 = 1.05 V, IO = 4 A
Figure 7. VFB2 Voltage vs Junction Temperature
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CH2 = 1.05 V, IO = 4 A
Figure 9. VFB2 Voltage vs Junction Temperature
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CH2 = 1.05 V
Figure 11. VFB2 Voltage vs Input Voltage
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CH2 = 1.05 V
Figure 13. VFB2 Voltage vs Input Voltage
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Figure 2. VIN Shutdown Current vs Junction Temperature
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Figure 4. VREG5 Voltage vs Junction Temperature
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CH1 = 1.8 V, IO = 4 A
Figure 6. VFB1 Voltage vs Junction Temperature
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CH1 = 1.8 V, IO = 4 A
Figure 8. VFB1 Voltage vs Junction Temperature
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CH1 = 1.8 V
Figure 10. VFB1 Voltage vs Input Voltage
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CH1 = 1.8 V
Figure 12. VFB1 Voltage vs Input Voltage