SLUS714E January   2007  – June 2019 TPS40077

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Application Diagram
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    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  Minimum Pulse Duration
      2. 7.3.2  Slew Rate Limit On VDD
      3. 7.3.3  Setting The Switching Frequency (Programming The Clock Oscillator)
      4. 7.3.4  Loop Compensation
      5. 7.3.5  Shutdown and Sequencing
      6. 7.3.6  Boost and LVBP Bypass Capacitance
      7. 7.3.7  Internal Regulators
      8. 7.3.8  Power Dissipation
      9. 7.3.9  Boost Diode
      10. 7.3.10 Synchronous Rectifier Control
    4. 7.4 Programming
      1. 7.4.1 Programming The Ramp Generator Circuit and UVLO
      2. 7.4.2 Programming Soft Start
      3. 7.4.3 Programming Short-Circuit Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 Buck Regulator 8-V to 16-V Input, 1.8-V Output at 10 A
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Power Train Components
            1. 8.2.1.2.1.1  Output Inductor, LOUT
            2. 8.2.1.2.1.2  Output Capacitor, COUT, ELCO and MLCC
            3. 8.2.1.2.1.3  Input Capacitor, CIN ELCO and MLCC
            4. 8.2.1.2.1.4  Switching MOSFET, QSW
            5. 8.2.1.2.1.5  Rectifier MOSFET, QSR
            6. 8.2.1.2.1.6  Timing Resistor, RT
            7. 8.2.1.2.1.7  Feed-Forward and UVLO Resistor, RKFF
            8. 8.2.1.2.1.8  Soft-Start Capacitor, CSS
            9. 8.2.1.2.1.9  Short-Circuit Protection, RILIM and CILIM
            10. 8.2.1.2.1.10 Boost Voltage, CBOOST and DBOOST (Optional)
            11. 8.2.1.2.1.11 Closing the Feedback Loop, RZ1, RP1, RPZ2, RSET1, RSET2, CZ2, CP2, and CPZ1
        3. 8.2.1.3 Application Curves
    3. 8.3 Additional System Examples
  9. 9 Layout
    1. 9.1 Layout Guidelines
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Community Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

8.2.1.1 Design Requirements

Table 3 lists the design specifications and Table 4 lists the bill of materials for this buck regulator application example.

Table 3. Characteristics

PARAMETER NOTES AND CONDITIONS MIN NOM MAX UNITS
INPUT CHARACTERSTICS
VIN Input voltage 8 12 16 V
IIN Input current VIN = NOM, IOUT = MAX 1.8 2 A
No-load input current VIN = NOM, IOUT = 0 A 62.6 3.6 mA
VIN_UVLO Input UVLO IOUT = MIN to MAX 5.4 6 6.6 V
VIN_ONV Input ONV IOUT = MIN to MAX 6.3 7 7.7 V
OUTPUT CHARACTERSTICS
VOUT Output voltage VIN = NOM, IOUT = NOM 1.75 1.8 1.85 V
Line regulation(1) VIN = MIN to MAX, IOUT = NOM 0.5%
Load regulation(1) VIN = NOM, IOUT = MIN to MAX 0.5%
VOUT_ripple Output voltage ripple VIN = NOM, IOUT = MAX 100 mVpp
IOUT Output current VIN = MIN to MAX 0 5 10 A
IOCP Output overcurrent inception point VIN = NOM, VOUT = VOUT – 5% 12.25 19.4 34 A
VOVP Output OVP IOUT = MIN to MAX NA NA NA
Transient response
ΔI  Load step IOUT_Max to 0.2 × IOUT _Max 8 A
Load slew rate 10 A/μs
Overshoot 200 mV
Settling time 1 ms
SYSTEM CHARACTERSTICS
fSW Switching frequency 240 300 360 kHz
ηpk Peak efficiency VIN = NOM, IOUT = MIN to MAX 90%
η Full-load efficiency VIN = NOM, IOUT = MAX 90%
Top Operating temperature range VIN = MIN to MAX, IOUT = MIN to MAX –40 25 85 °C
MECHANICAL CHARACTERSTICS
L Width 2 Inches
5.08 cm
W Length 3 Inches
7.62 cm
h Component height 0.41 Inch
1.04 cm
(1) Voltage accuracy is dependent on resistor tolerance and reference accuracy. Line and load regulation are calculated with respect to the actual set point voltage.

Table 4. Bill of Materials

REFDES COUNT VALUE DESCRIPTION SIZE PART NUMBER MFR
C1 1 470 μF Capacitor, aluminum, 470-μF, 25-V, 20% 0.457 x 0.406 EEVFK1E471P Panasonic
C2, C10 2 0.1 μF Capacitor, ceramic, 25-V, X7R, 20% 0603 Std Vishay
C3 1 15 nF Capacitor, ceramic, 25-V, X7R 20% 0603 Std Vishay
C4 1 47 pF Capacitor, ceramic, 25-V, X7R, 20% 0603 Std Vishay
C5 1 1.8 nF Capacitor, ceramic, 25-V, X7R 20% 0603 Std Vishay
C6 1 680 pF Capacitor, ceramic, 25-V, X7R 20% 0603 Std Vishay
C7 1 51 pF Capacitor, ceramic, 25-V, COG 20% 0603 Std Vishay
C8, C11 2 0.1 μF Capacitor, ceramic, 25-V, X7R, 20% 0603 Std Vishay
C9 1 1 μF Capacitor, ceramic, 25-V, X7R, 20% 0805 Std Vishay
C12, C14, C15 3 22 μF Capacitor, ceramic, 22-μF, 16-V, X5R, 20% 1812 C4532X5R1C226MT TDK
C13 1 2.2 nF Capacitor, ceramic, 25-V, X7R, 20% 0603 Std Vishay
C16 1 470 μF Capacitor, aluminum, SM, 6.3-V, 300-mΩ (FC series) 8 × 10 Std Panasonic
C17 1 47 μF Capacitor, ceramic, 47-uF, 6.3-V, X5R, 20% 1812 C4532X5R0J476MT TDK
D1 1 BAT54 Diode, Schottky, 200-mA, 30-V SOT23 BAT54 Vishay
J1, J2 2 ED1609-ND Terminal block, 2-pin, 15-A, 5,1-mm 0.40 × 0.35 ED1609 OST
J3 1 PTC36SAAN Header, 2-pin, 100-mil spacing, (36-pin strip) 0.100 × 2 PTC36SAAN Sullins
L1 1 2.5 μH Inductor, SMT, 2.5 μH, 16.5-A, 3.4- mΩ 0.515 × 0.516 MLC1550-252ML Coilcraft
Q1 1 Si7860DP MOSFET, N-channel, 30-V, 18-A, 8.0-mΩ PWRPAK S0-8 Si7860DP Vishay
Q2 1 Si7336ADP MOSFET, N-channel, 30-V, 18-A, 40-mΩ PWRPAK S0-8 Si7886ADP Vishay
Q3 1 FDV301N MOSFET, N-channel, 25-V, 220-mA, 5-Ω SOT23 FDV301N Fairchild
R1 1 10 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R2, R6 2 165 kΩ Resistor, Chip, 1/16-W, 20% 0603 Std Std
R3 1 32.4 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R4, R11 2 0 Ω Resistor, chip, 1/16-W, 20% 0603 Std Std
R5 1 21.5 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R7 1 51 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R8 1 3.3 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R9 1 1.8 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R10 1 330 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
R12 1 51 Ω Resistor, chip, 1/16-W, 20% 0603 Std Std
R13 1 1 kΩ Resistor, chip, 1/16-W, 20% 0603 Std Std
U1 1 TPS40077PWP IC, Texas Instruments PWP16 TPS40077PWP TI