SLVS631C December   2005  – May 2015 TPS51117

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 Electrical Characteristics
    4. 6.4 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 Frequency and Adaptive On-Time Control
      2. 7.3.2  Low-Side Driver
      3. 7.3.3  High-Side Driver
      4. 7.3.4  Soft-Start
      5. 7.3.5  Powergood
      6. 7.3.6  Output Discharge Control (Soft-Stop)
      7. 7.3.7  Overcurrent Limit
      8. 7.3.8  Negative Overcurrent Limit (PWM-Only Mode)
      9. 7.3.9  Overvoltage Protection
      10. 7.3.10 Undervoltage Protection
      11. 7.3.11 Start-Up Sequence
      12. 7.3.12 UVLO Protection
      13. 7.3.13 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 PWM Operation
      2. 7.4.2 Light-Load Condition With Auto-Skip Function
  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 D-CAP Mode Operation
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Community Resources
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RGY|14
  • PW|14
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Specifications

6.1 Absolute Maximum Ratings(1)

MIN MAX UNIT
Input voltage VBST –0.3 36 V
VBST (with respect to LL) –0.3 6
EN_PSV, TRIP, V5DRV, V5FILT –0.3 6
VOUT –0.3 6
TON –0.3 6
Output voltage DRVH –1 36 V
DRVH (with respect to LL) –0.3 6
LL –1 30
PGOOD, DRVL –0.3 6
PGND –0.3 0.3
TA Operating free-air temperature –40 85 °C
TJ Junction temperature –40 125 °C
Lead temperature 1.6 mm (1/16 inch) from case for 10 seconds 260 °C
Tstg Storage temperature –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.

6.2 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
Supply input voltage 4.5 5.5 V
Input voltage VBST 4.5 34 V
VBST (with respect to LL) 4.5 5.5
EN_PSV, TRIP, V5DRV, V5FILT –0.1 5.5
VOUT –0.1 5.5
TON –0.1 5.5
Output voltage DRVH –0.8 34 V
DRVH (with respect to LL) –0.1 5.5
LL –0.8 28
PGOOD, DRVL –0.1 5.5
PGND –0.1 0.1
Operating free-air temperature, TA –40 85 °C

6.3 Electrical Characteristics

over operating free-air temperature range (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
IV5FILTPWM Supply current V5FILT + V5DRV current, PWM, EN_PSV = float, VFB = 0.77 V, LL = –0.1 V 400 750 μA
IV5FILTSKIP Supply current V5FILT + V5DRV current, auto-skip, EN_PSV = 5 V, VFB = 0.77 V, LL = 0.5 V 250 470 μA
IV5DRVSDN V5DRV shutdown current V5DRV current, EN_PSV = 0 V 0 1 μA
IV5FILTSDN V5FILT shutdown current V5FILT current, EN_PSV = 0 V 4.5 7.5 μA
VOUT AND VFB VOLTAGES
VOUT Output voltage Adjustable output range 0.75 5.5 V
VVFB VFB regulation voltage 750 mV
VVFB_TOL VFB regulation voltage tolerance TA = 25°C, bandgap initial accuracy –0.9% 0.9%
TA = 0°C to 85°C –1.3% 1.3%
TA = –40°C to 85°C –1.6% 1.6%
IVFB VFB input current VFB = 0.75 V, absolute value 0.02 0.1 μA
RDischg VOUT discharge resistance EN_PSV = 0 V, VOUT = 0.5 V 20 32 Ω
ON-TIME TIMER AND INTERNAL SOFT-START
TONN Nominal on-time VLL = 12 V, VOUT = 2.5 V, RTON = 250 kΩ 750 ns
TONF Fast on-time VLL = 12 V, VOUT = 2.5 V, RTON = 100 kΩ 264 330 396 ns
TONS Slow on-time VLL = 12 V, VOUT = 2.5 V, RTON = 400 kΩ 1169 ns
TON(MIN) Minimum on-time VOUT = 0.75 V, RTON = 100 kΩ to 28 V(1) 80 110 140 ns
TOFF(MIN) Minimum off-time VFB = 0.7 V, LL = –0.1 V,
TRIP = open 		440 ns
TSS Internal soft-start time Time from EN_PSV > 3 V to VFB regulation
value = 0.735 V		 0.82 1.2 1.5 ms
OUTPUT DRIVERS
RDRVH DRVH resistance Source, VVBST-DRVH = 0.5 V 5 7 Ω
Sink, VDRVH-LL = 0.5 V 1.5 2.5
RDRVL DRVL resistance Source, VV5DRV-DRVL = 0.5 V 5 7 Ω
Sink, VDRVL-PGND = 0.5 V 1.5 2.5
TD Dead time DRVH-low (DRVH = 1 V) to DRVL-high
(DRVL = 4 V), LL = –0.05 V		 10 20 50 ns
DRVL-low (DRVL = 1 V) to DRVH-high
(DRVH = 4 V), LL = –0.05 V		 30 40 60 ns
INTERNAL BST DIODE
VFBST Forward voltage VV5DRV-VBST, IF = 10 mA, TA = 25°C 0.7 0.8 0.9 V
IVBSTLK VBST leakage current VBST = 34 V, LL = 28 V 0.1 1 μA
UVLO/LOGIC THRESHOLD
VUVLO V5FILT UVLO Threshold Wake up 3.7 3.9 4.1 V
Hysteresis 200 300 400 mV
VEN_PSV EN_PSV logic input voltage EN_PSV low 0.7 1.0 1.3 V
Hysteresis 150 200 250 mV
EN_PSV float (set PWM_only mode) 1.7 1.95 2.25 V
EN_PSV high (set Auto_skip mode) 2.4 2.65 2.9 V
Hysteresis 100 175 250 mV
IEN_PSV EN_PSV source current EN_PSV = GND, absolute value(2) 1 μA
POWERGOOD COMPARATOR
VTHPG PG threshold PG in from lower (PGOOD goes high) 92.5% 95% 97.5%
PG low hysteresis (PGOOD goes low) –4% –5.5% –7%
PG in from higher (PGOOD goes high) 102% 105% 107%
PG high hysteresis (PGOOD goes low) 4% 5.5% 7%
IPGMAX PG sink current PGOOD = 0.5 V 2.5 7.5 mA
TPGDEL PG delay Delay for PGOOD in 45 63 85 μs
CURRENT SENSE
ITRIP TRIP source current VTRIP < 0.3 V, TA = 25°C 9 10 11 μA
TCITRIP ITRIP temperature coefffecient On the basis of 25°C 4500 ppm/°C
VRtrip Current limit threshold range setting range VTRIP-GND voltage(2), all temperatures 30 200 mV
VOCLoff Overcurrent limit comparator offset (VTRIP-GND-VPGND-LL) voltage VTRIP-GND = 60 mV –10 0 10 mV
VUCLoff Negative overcurrent limit comparator offset (VTRIP-GND-VLL-PGND) voltage VTRIP-GND = 60 mV,
EN_PSV = float		 –9.5 0.5 10.5 mV
VZCoff Zero crossing comparator offset VPGND-LL voltage, EN_PSV = 3.3 V –9.5 0.5 10.5 mV
UNDERVOLTAGE AND OVERVOLTAGE PROTECTION
VOVP VFB OVP trip threshold OVP detect 111% 115% 119%
TOVPDEL VFB OVP propagation delay See (2) 1.5 μs
VUVP VFB UVP trip threshold UVP detect 65% 70% 75%
Hysteresis 10%
TUVPDEL VFB UVP delay 22 32 42 μs
TUVPEN UVP enable delay After 1.7 × TSS, UVP protection engaged 1.4 2 2.6 ms
THERMAL SHUTDOWN
TSDN Thermal shutdown threshold Shutdown temperature(2) 160 °C
Hysteresis(2) 12
(1) Design constraint, ensure actual on-time is larger than the maximum value (that is, design RTON such that the minimum tolerance is 100 kΩ).
(2) Ensured by design. Not production tested.

6.4 Typical Characteristics

TPS51117 icc_jt_lvs631.gif
Figure 1. PWM Supply Current vs Junction Temperature
TPS51117 itp_tj_lvs631.gif
Figure 3. Trip Current vs Junction Temperature
TPS51117 tsw_res_lvs631.gif
Figure 5. Measured Switching Frequency vs Ton Resistance
TPS51117 sfa_io_lvs631.gif
Figure 7. Switching Frequency vs Output Current (1.05 V)
TPS51117 vo_io_lvs631.gif
Figure 9. 1.05-V Output Voltage vs Output Current
TPS51117 vo_vi_lvs631.gif
Figure 11. 1.05-V Output Voltage vs Input Voltage
TPS51117 eff_io_lvs631.gif
Figure 13. 1.05-V Efficiency vs Output Current
TPS51117 ld_trns_lvs631.gif
Figure 15. 1.05-V Load Transient Response
TPS51117 as_pwm_lvs631.gif
Figure 17. Mode Transition
Auto-Skip to PWM
TPS51117 sd_tj_lvs631.gif
Figure 2. V5FILT Shutdown Current vs Junction Temperature
TPS51117 ovp_tj_lvs631.gif
Figure 4. OVP/UVP Threshold vs Junction Temperature
TPS51117 fsw_vi_lvs631.gif
Figure 6. Switching Frequency vs Input Voltage
TPS51117 sf_io_lvs631.gif
Figure 8. Switching Frequency vs Output Current (2.5 V)
TPS51117 vo2_io_lvs631.gif
Figure 10. 2.5-V Output Voltage vs Output Current
TPS51117 vo2_vi_lvs631.gif
Figure 12. 2.5-V Output Voltage vs Input Voltage
TPS51117 eff2_io_lvs631.gif
Figure 14. 2.5-V Efficiency vs Output Current
TPS51117 ld2_trns_lvs631.gif
Figure 16. 2.5-V Load Transient Response
TPS51117 pwm_as_lvs631.gif
Figure 18. Mode Transition
PWM to Auto-Skip