SLUS670C JULY   2005  – January 2015 TPS51120

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 Recommended Operating Conditions
    3. 6.3 Thermal Information
    4. 6.4 Electrical Characteristics
    5. 6.5 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  PWM Operation
      2. 7.3.2  Adaptive On-Time Control
      3. 7.3.3  Light Load Operation
      4. 7.3.4  Forced PWM Operation
      5. 7.3.5  5-V, 100-mA, LDO and Switchover (VREG5)
      6. 7.3.6  3.3-V, 100-mA, LDO and Switchover (VREG3)
      7. 7.3.7  2-V, 50-uA Sink - Source Reference (VREF2)
      8. 7.3.8  Low-Side Driver
      9. 7.3.9  High-Side Driver
      10. 7.3.10 Soft-Start
      11. 7.3.11 Soft-Stop
      12. 7.3.12 Powergood
      13. 7.3.13 Current Sensing and Overcurrent Protection
      14. 7.3.14 Overvoltage Protection
      15. 7.3.15 Undervoltage Protection
      16. 7.3.16 5-V Supply and UVLO Protection
      17. 7.3.17 VIN Line Sag Protection (Dynamic UVP)
      18. 7.3.18 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Current Mode
        1. 7.4.1.1 Current Mode Operation
      2. 7.4.2 D-Cap Mode
        1. 7.4.2.1 D-Cap Mode Operation
    5. 7.5 Programming
  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
      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 Trademarks
    2. 11.2 Electrostatic Discharge Caution
    3. 11.3 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RHB|32
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 VBST1, VBST2 –0.3 36 V
VBST1, VBST2 wrt LL –0.3 6
VIN, EN5 –0.3 30
SKIPSEL, TONSEL, EN1, EN2, CS1, CS2, V5FILT, VFB1, VFB2, EN3, VO1, VO2 –0.3 6
Output voltage DRVH1, DRVH2 –1 36 V
DRVH1, DRVH2 (wrt LL) –0.3 6
LL1, LL2 –1 30
VREF2, VREG3, VREG5, PGOOD1, PGOOD2, DRVL1, DRVL2, COMP1, COMP2 –0.3 6
PGND1, PGND2 –0.3 0.3
Source/sink current VREF2 1 mA
VBST 100
VREG5, VREG3 (source only) 200
TA Operating ambient temperature –40 85 °C
TJ Junction temperature –40 125
Lead temperature 1.6 mm (1/16 inch) from case for 10 seconds 255
Tstg Storage temperature –55 150
(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. All voltage values are with respect to the network ground terminal unless otherwise noted.

6.2 Recommended Operating Conditions

MIN MAX UNIT
Input voltage, V5FILT 4.5 5.5 V
Input voltage range VBST1, VBST2 -0.1 34 V
VBST1, VBST2 wrt LL -0.1 5.5
VIN, EN5 -0.1 28
SKIPSEL, TONSEL, EN1, EN2, CS1, CS2, V5FILT, VFB1, VFB2, EN3 -0.1 5.5
VO1, VO2 -0.1 5.5
Output voltage range DRVH1, DRVH2 -0.8 34 V
DRVH1, DRVH2 (wrt LL) -0.1 5.5
LL1, LL2 -0.8 28
VREF2, VREG5, VREG3, PGOOD1, PGOOD2, DRVL1, DRVL2, COMP1, COMP2 -0.1 5.5
PGND1, PGND2 -0.1 0.1
Source/sink current VREF2 0.08 mA
VBST 50
VREG5, VREF3 (source only) 100
Operating ambient temperature range, TA -40 85 °C

6.3 Thermal Information

THERMAL METRIC(1) TPS51120 UNIT
RHB
32 PINS
RθJA Junction-to-ambient thermal resistance 38.5 °C/W
(1) For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.

6.4 Electrical Characteristics

over operating free-air temperature range, VVIN = 12 V, VVREG5 = VV5FILT = 5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
IINCCAP Supply current VIN current, VREG5=VREG3=No Load, EN3=EN5=FLOAT, EN1=EN2=5V, CS=5V, COMP connected to Cap Current mode 750 1500 μA
IINNOCAP Supply current VIN current, VREG5=VREG3=No Load, EN3=EN5=FLOAT; EN1=EN2=5V, CS=5V, COMP=5V D-CAP mode 700 1400
IIN5(STBY) Stand-by current VIN current, VREG5=No Load EN3=0V, EN5=FLOAT, EN1=EN2=0 5-V only 30 45
IIN3(STBY) Stand-by current VIN current, VREG3=No Load EN3=FLOAT, EN5=0, EN1=EN2=0 3.3-V only 12 20
IIN532(STBY) Stand-by current VIN current, VREG5=VREG3=VREF2=No Load EN3=EN5=FLOAT, EN1=EN2=0 100 160
IIN(SHDN) Shut down current VIN current, EN3=EN5=EN1=EN2=0V 10 20
VOUT and VREF2 VOLTAGES
VOUT Output voltage VFB2 = 3.3 V, TA= 25°C, No Load 3.241 3.300 3.359 V
VFB2 = 3.3 V, TA= 0 to 85°C, No Load 3.234 3.300 3.366
VFB2 = 3.3 V, TA= -40 to 85°C, No Load 3.224 3.300 3.376
VFB1 = 5 V, TA= 25°C, No Load 4.910 5.000 5.090
VFB1 = 5 V, TA= 0 to 85°C, No Load 4.900 5.000 5.100
VFB1 = 5 V, TA= -40 to 85°C, No Load 4.885 5.000 5.115
Adjustable mode output range 1.0 5.5
VADJ Output regulation voltage Adjustable mode 1.00 V
VADJ T Output regulation voltage tolerance Adjustable mode, TA= 25°C -0.9% 0.9%
Adjustable mode, TA= 0 to 85°C -1.3% 1.3%
Adjustable mode, TA= -40 to 85°C -1.6% 1.6%
VVREF2 2-V output regulation voltage IVREF2 ± 50 μA, TA= 25°C 1.97 2.00 2.03 V
VVREF2T 2-V output regulation voltage tolerance IVREF2 ± 50 μA, TA= 0 to 85°C 1.96 2.04
IVREF2 ± 50 μA, TA= -40 to 85°C 1.95 2.05
IVFB VFB input current VFBx=1.02V, COMPx=open 0.02 μA
VFBx=1.02V, COMPx=5V 0.02
RDISCHARG Discharge switch resistance VOx=0.5V, TA= 25°C 10 20 Ω
VREG3 VOLTAGE
VVREG3 VREG3 Output Regulation Voltage IVREG3 = 20 mA, 6V < VIN < 28V, TA= 25°C 3.25 3.30 3.35 V
VVREG3T VREG3 Output Voltage Tolerance IVREG3 = 1 - 50 mA , 6V < VIN < 28V, TA= 0 to 85°C 3.21 3.37
IVREG3 = 1 - 100 mA , 6V < VIN < 28V, TA= -40 to 85°C 3.16 3.39
IVREG3 VREG3 Output Current TA = 25°C, VREG3=3.14V(1) 170 mA
VLDO3SW VREG3 Bootstrap Switch Threshold Rising edge of VO2, VREG3 drops to VO2 voltage 2.85 3.10 V
Hysteresis 120 mV
RLDO3SW VREG3 Bootstrap Switch Resistance 1.3 3.0 Ω
VREG5 VOLTAGE
VVREG5 VREG5 Output Regulation Voltage IVREG5 = 20 mA, 6V < VIN < 28V, TA= 25°C 4.925 5.00 5.075 V
VVREG5T VREG5 Output Voltage Tolerance IVREG5 = 1 - 50 mA , 6V < VIN < 28V, TA= 0 to 85°C 4.89 5.11
IVREG5 = 1 - 100 mA , 6V < VIN < 28V, TA= -40 to 85°C 4.80 5.15
IVREG5 VREG5 Output Current TA = 25°C, VREG5=4.75 V(1) 200 mA
VLDO5SW VREG5 Bootstrap Switch Threshold Rising edge of VO1, VREG5 drops to VO1 voltage 4.30 4.85 V
Hysteresis 140 mV
RLDO5SW VREG5 Bootstrap Switch Resistance 1.3 3.0 Ω
TRANSCONDUCTANCE AMPLIFIER
Gm Gain TA = 25°C 280 μS
ICOMPSINK COMP Maximum Sink Current VFBx=1.05V, COMPx=1.28V 8 12 16 μA
ICOMPSRC COMP Maximum Source Current VFBx=0.95V, COMPx=1.28V -15 -11 -7
VCOMPHI COMP High Clamp Voltage CSx=0V, VFBx=0.95V 1.26 1.34 1.42 V
VCOMPLO COMP Low Clamp Voltage CSx=0V, VFBx=1.05V 1.08 1.12 1.20
OUTPUT DRIVER
RDRVH DRVH resistance Source, VVBST-DRVH = 1V 3.5 7 Ω
Sink, VDRVH-LL = 1V 1.5 3
RDRVL DRVL resistance Source, VVREG5-DRVL = 1V 3.5 7
Sink, VDRVL-PGND = 1V 1.5 3
TD Dead time DRVH-off to DRVL-on, TA= 25°C 20 ns
DRVL-off to DRVH-on, TA= 25°C 30 60
VDTH DRVH-off threshold LL to GND(1) 2 V
VDTL DRVL-off threshold DRVL to GND (1) 1.1
INTERNAL BST DIODE
VFBST Forward Voltage VVREG5-VBST, IF = 10 mA, TA= 25°C 0.7 0.8 0.9 V
IRBST Reverse Current VBST = 34 V, VREG5=5V 0.1 1.0 μA
IBST(LEAK) VBST Leakage current VBST=34V, LL=28V, EN3=EN5=EN1=EN2=0V 0.1 1.0
ON-TIME TIMER, INTERNAL SOFT-START and HOUSEKEEPING CLOCK
TON1a On time, 5V, 180 kHz VLL1=12V, VOUT1=5V, TONSEL=5V, TA= 25°C 2150 2340 2530 ns
TON1b On time, 5V, 220 kHz VLL1=12V, VOUT1=5V, TONSEL=FLOAT, TA= 25°C 1790 1950 2110
TON1c On time, 5V, 280 kHz VLL1=12V, VOUT1=5V, TONSEL=2V, TA= 25°C 1370 1490 1610
TON1d On time, 5V, 380 kHz VLL1=12V, VOUT1=5V, TONSEL=GND, TA= 25°C 1020 1110 1200
TON2a On time, 3.3V, 270 kHz VLL2=12V, VOUT2=3.3V, TONSEL=5V, TA= 25°C 940 1030 1120
TON2b On time, 3.3V, 330 kHz VLL2==12V, VOUT1=3.3V, TONSEL=FLOAT, TA= 25°C 780 850 920
TON2c On time, 3.3V, 430 kHz VLL2==12V, VOUT1=3.3V, TONSEL=2V, TA= 25°C 580 650 720
TON2d On time, 3.3V, 580 kHz VLL2==12V, VOUT1=3.3V, TONSEL=GND, TA= 25°C 430 480 530
TON(MIN)1 Minimum on time, 5V TA = 25°C, TONSEL=GND, VLL1=28V, VO1=1V 70
TON(MIN)2 Minimum on time, 3.3V TA = 25°C, TONSEL=GND, VLL2=28V, VO2=1V 45
TOFF(MIN) Minimum off time TA = 25°C, VFB=0.9V, LL=0.5V 480
TSS Internal Soft Start Timer TA = 25°C, ENx>3V 772 clks
SLSS Internal Soft Start Slope TA = 25°C, ENx>3V, Slope wrt. VFB(1) 0.3 V/ms
FCLK HK clock frequency 230 290 350 kHz
UVLO/LOGIC THRESHOLD
VENLDOH LDO enable threshold EN3, EN5, low to high 0.3 0.6 0.8 V
Hysteresis 0.2
VENLDOFL3 EN3 pullup voltage EN3 = FLOAT (OPEN)(1) 1.7
VENLDOFL5 EN5 pullup voltage EN5= FLOAT (OPEN)(1) 3.3
IENLDOFL EN3, EN5 pullup current VENx < 0.5V 1.5 4.0 μA
VUV(VREG5) VREG5 UVLO threshold Wake up 3.8 4.0 4.2 V
Hysteresis 100 200 300 mV
VSKIPSEL SKIPSEL threshold Auto-SKIP Mode Enabled 0 0.7 V
Auto-SKIP Mode Enabled, Faults Off 1.3 2.2
PWM-Only Mode Enabled 2.7 5.5
VTONSEL TONSEL threshold Fast Switching Frequency 0 0.7
Medium Switching Frequency #2 1.3 2.2
Medium Switching Frequency #1 2.7 3.0
Slow Switching Frequency 4.5 5.5
ISEL SKIPSEL/TONSEL input current SKIPSEL, TONSEL=0V 1 3 μA
SKIPSEL, TONSEL=5V 1 2
VENSWSTAT EN1, EN2 SS Start Voltage BJT Base input, Switcher begins to Track ENx 0.5 0.9 1.2 V
VENSWEND EN1, EN2 SS End Voltage ‘Logic High’ Level for Switcher Enable when using Internal Softstart, 0°C ≤ TA ≤ 85°C 2.75 2.90
IENSW1,2 EN1, EN2 Pullup Current EN1, EN2=0.6V 1 2 3 μA
VTHVFB1 VFB1 threshold 5.0V preset output V5FILT -0.3 V
VTHVFB2 VFB2 threshold 3.3V preset output V5FILT -0.3
CURRENT SENSE
VOCL Current limit threshold Resistor sense scheme , VPGND - VCS voltage, PGOOD=Hi 67 80 93 mV
ITRIP CS Sink Current RDS(ON) sense scheme, PGOOD=Hi, TA= 25°C 9 10 11 μA
TCITRIP ITRIP temperature Coefficient RDS(ON) sense scheme, On the basis of 25°C 4500 ppm/°C
VOCLoff OCP Comparator Offset (VVREG5-CS-VPGND-LL) voltage, VVREG5-CS = 80mV,
RDS(ON) sense		 -10 0 10 mV
VR(trip) Current limit threshold setting range VV5FILT-VCS voltage 30 150
VZC Zero cross detection Comparator offset VPGNDx-VLLx voltage, SKIPSEL=0V -5 1 5
POWERGOOD COMPARATOR
VTH(PG) PGOOD Threshold Power Bad Threshold ±7% ±10% ±13%
Hysteresis ±5%
IPG(MAX PGOOD Sink Current PGOOD=0.5 V 2.5 5.0 mA
TPGDEL PGOOD Delay Timer Delay for PGOOD in, ‘clks’=HK Clock 256 clks
UNDERVOLTAGE and OVERVOLTAGE PROTECTION
VOVP VFBx OVP Trip Threshold OVP detect 110% 115% 120%
TOVPDEL VFBx OVP Delay Time 2 ms
VUVP VFBx UVP Trip Threshold UVP detect 65% 70% 75%
Hysteresis 6%
TUVPDEL VFBx UVP Delay Timer ‘clks’=HK Clock 128 clks
THERMAL SHUTDOWN
TSDN1 Thermal shutdown threshold Shutdown temperature 145 °C
Hysteresis 10
(1) Ensured by design. Not production tested.

6.5 Typical Characteristics

vin_vs_jt_lus670.gifFigure 1. VIN Supply Current vs Junction Temperature
iin532_vs_tj_lus670.gifFigure 3. VIN Standby Current vs Junction Temperature
isd_vs_tj_lus670.gifFigure 5. VIN Shutdown Current vs Junction Temperature
ibat_vs_vin_lus670.gifFigure 7. No-Load Battery Current vs Input Voltage
swg_vs_vin_lus670.gifFigure 9. Switching Frequency vs Input Voltage
swf_vs_vin_lus670.gifFigure 11. Switching Frequency vs Input Voltage
swg_vs_io_lus670.gifFigure 13. Switching Frequency vs Output Current
swf_vs_io_lus670.gifFigure 15. Switching Frequency vs Output Current
ov_vs_tj_lus670.gifFigure 17. OVP/UVP Threshold Voltage vs Junction Temperature
load3_vs_io_lus670.gifFigure 19. VREG3 Output Voltage vs Output Current
load5_vs_a_lus670.gifFigure 21. 5-V Output Voltage vs Output Current
line5_vs_vin_lus670.gifFigure 23. 5-V Output Voltage vs Input Voltage
five_eff_lus670.gifFigure 25. 5-V Efficiency vs Output Current
iin_vs_vin_lus670.gifFigure 2. VIN Supply Current vs Input Voltage
iin53_vs_vin_lus670.gifFigure 4. VIN Standby Current vs Input Voltage
isd_vs_vin_lus670.gifFigure 6. VIN Shutdown Current vs Input Voltage
cs_vs_tj_lus670.gifFigure 8. Current Sense Current vs Junction Temperature
sw2v_vs_vin.gifFigure 10. Switching Frequency vs Input Voltage
sw5v_vs_vin_lus670.gifFigure 12. Switching Frequency vs Input Voltage
sw2v_vs_io_lus670.gifFigure 14. Switching Frequency vs Output Current
sw5v_vs_io_lus670.gifFigure 16. Switching Frequency vs Output Current
load5_vs_io_lus670.gifFigure 18. VREG5 Output Voltage vs Output Current
load2_vs_io_lus670.gifFigure 20. VREF2 Output Voltage vs Output Current
load3_vs_a_lus670.gifFigure 22. 3.3-V Output Voltage vs Output Current
line3_vs_vin_lus670.gifFigure 24. 3.3-V Output Voltage vs Input Voltage
three_eff_lus670.gifFigure 26. 3.3-V Efficiency vs Output Current