IC STEP-DOWN SWIFT CONV 10-MSOP

TPS54040DGQ

Manufacturer Part NumberTPS54040DGQ
DescriptionIC STEP-DOWN SWIFT CONV 10-MSOP
ManufacturerTexas Instruments
SeriesSWIFT™, Eco-Mode™
TypeStep-Down (Buck)
TPS54040DGQ datasheet
 


Specifications of TPS54040DGQ

Internal Switch(s)YesSynchronous RectifierNo
Number Of Outputs1Voltage - Output0.8 ~ 39 V
Current - Output500mAFrequency - Switching100kHz ~ 2.5MHz
Voltage - Input3.5 ~ 42 VOperating Temperature-40°C ~ 150°C
Mounting TypeSurface MountPackage / Case10-MSOP Exposed Pad, 10-HMSOP, 10-eMSOP
Mounting StyleSMD/SMTDuty Cycle (max)98 %
Input / Supply Voltage (max)42 VInput / Supply Voltage (min)3.5 V
Maximum Operating Temperature+ 150 CMinimum Operating Temperature- 40 C
Output Current0.5 AOutput Voltage0.8 V to 39 V
Supply Current116 uASwitching Frequency2500 KHz
Dc To Dc Converter TypeStep DownPin Count10
Input Voltage42VSwitching Freq2500KHz
Package TypeHTSSOP EPOutput TypeAdjustable
Switching RegulatorYesMountingSurface Mount
Input Voltage (min)3.5VOperating Temperature ClassificationAutomotive
Lead Free Status / RoHS StatusLead free / RoHS CompliantPower - Output-
Other names296-24228-5  
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SWIFT™ DC/DC CONVERTER WITH ECO-MODE™
FEATURES
1
3.5V to 42V Input Voltage Range
2
200-mΩ High-Side MOSFET
High Efficiency at Light Loads with a Pulse
Skipping Eco-Mode™
116 A Operating Quiescent Current
1.3 A Shutdown Current
100kHz to 2.5MHz Switching Frequency
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
UV and OV Power Good Output
Adjustable UVLO Voltage and Hysteresis
DESCRIPTION
The TPS54040 device is a 42V, 0.5A, step down regulator with an integrated high side MOSFET. Current mode
control provides simple external compensation and flexible component selection. A low ripple pulse skip mode
reduces the no load, regulated output supply current to 116 A. Using the enable pin, shutdown supply current is
reduced to 1.3 A, when the enable pin is low.
Under voltage lockout is internally set at 2.5V, but can be increased using the enable pin. The output voltage
startup ramp is controlled by the slow start pin that can also be configured for sequencing/tracking. An open
drain power good signal indicates the output is within 93% to 107% of its nominal voltage.
A wide switching frequency range allows efficiency and external component size to be optimized. Frequency fold
back and thermal shutdown protects the part during an overload condition.
The TPS54040 is available in 10 pin thermally enhanced MSOP Power Pad™ package.
SIMPLIFIED SCHEMATIC
VIN
PWRGD
TPS54040
EN
BOOT
PH
SS /TR
RT /CLK
COMP
VSENSE
GND
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
Eco-Mode, PowerPAD, SwitcherPro, SWIFT are trademarks of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
0.5A, 42V STEP DOWN
0.8-V Internal Voltage Reference
MSOP10 Package With PowerPAD™
Supported by SwitcherPro™ Software Tool
(http://focus.ti.com/docs/toolsw/folders/print/s
witcherpro.html)
For SWIFT™ Documentation, See the TI
Website at
http://www.ti.com/swift
APPLICATIONS
12-V and 24-V Industrial and Commercial Low
Power Systems
Aftermarket Auto Accessories: Video, GPS,
Entertainment
100
90
80
70
60
50
40
30
20
10
0
0
0.1
TPS54040
SLVS918 – MARCH 2009
EFFICIENCY
vs
LOAD CURRENT
V = 12 V,
I
V = 5.0 V,
O
f
= 700 kHz
sw
0.2
0.3
0.4
0.5
Load Current - A
Copyright © 2009, Texas Instruments Incorporated

TPS54040DGQ Summary of contents

  • Page 1

    ... Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. Eco-Mode, PowerPAD, SwitcherPro, SWIFT are trademarks of Texas Instruments. 2 PRODUCTION DATA information is current as of publication date. ...

  • Page 2

    ... For the most current package and ordering information see the Package Option Addendum at the end of this document, or see the TI website at www.ti.com. (2) The DGQ package is also available taped and reeled. Add an R suffix to the device type (i.e., TPS54040DGQR). ABSOLUTE MAXIMUM RATINGS Over operating temperature range (unless otherwise noted). ...

  • Page 3

    ... Error amplifier source/sink COMP to switch current transconductance CURRENT LIMIT Current limit threshold THERMAL SHUTDOWN Thermal shutdown Copyright © 2009, Texas Instruments Incorporated PACKAGE DISSIPATION RATINGS THERMAL IMPEDANCE JUNCTION TO AMBIENT TEST CONDITIONS No voltage hysteresis, rising and falling 25°C, 3.5 V ≤ VIN ≤ VSENSE = 0.83 V, VIN = 12 V, 25° ...

  • Page 4

    ... V(PWRGD) < 0.5 V, II(PWRGD) = 100 A Product Folder Link(s): TPS54040 www.ti.com MIN TYP MAX UNIT 100 2500 kHz 450 581 720 kHz 300 2200 kHz 40 ns 1.9 2.2 V 0.5 0 100 1.0 V 112 92% 94% 109% 107 Ω 0.95 1.5 V Copyright © 2009, Texas Instruments Incorporated ...

  • Page 5

    ... SS/ voltage on this pin overrides the internal reference, it can be used for tracking and sequencing. VIN 2 I Input supply voltage, 3 VSENSE 7 I Inverting node of the transconductance ( gm) error amplifier. Copyright © 2009, Texas Instruments Incorporated DEVICE INFORMATION MSOP10 (TOP VIEW Thermal Pad 3 8 (11) ...

  • Page 6

    ... PWM Latch Slope Compensation Frequency Shift Clamp Oscillator with PLL 5 RT/CLK Product Folder Link(s): TPS54040 www.ti.com VIN 2 Thermal UVLO Shutdown Shutdown Logic Boot Charge Boot Current UVLO Sense 1 BOOT PH 10 POWERPAD 11 GND 9 TPS54040 Block Diagram Copyright © 2009, Texas Instruments Incorporated ...

  • Page 7

    ... SWITCHING FREQUENCY vs RT/CLK RESISTANCE HIGH FREQUENCY RANGE 2500 2000 1500 1000 500 100 RT/CLK - Resistance - kW Figure 5. Copyright © 2009, Texas Instruments Incorporated TYPICAL CHARACTERISTICS VOLTAGE REFERENCE vs JUNCTION TEMPERATURE 0.816 0.808 0.800 0.792 0.784 -50 75 100 125 150 SWITCHING FREQUENCY vs JUNCTION TEMPERATURE 610 ...

  • Page 8

    ... Product Folder Link(s): TPS54040 - 100 125 T - Junction Temperature - °C J Figure Threshold +50 mV I(EN) - 100 125 T - Junction Temperature - °C J Figure 10 100 125 T - Junction Temperature - °C J Figure 12. Copyright © 2009, Texas Instruments Incorporated www.ti.com 150 150 150 ...

  • Page 9

    ... T - Junction Temperature - °C J Figure 15. VIN SUPPLY CURRENT vs JUNCTION TEMPERATURE 140 0.83 V I(VSENSE) 130 120 110 100 90 -50 - Junction Temperature - °C J Figure 17. Copyright © 2009, Texas Instruments Incorporated 100 100 125 150 0 SHUTDOWN SUPPLY CURRENT vs INPUT VOLTAGE (V 2 1 100 125 150 0 ...

  • Page 10

    ... Product Folder Link(s): TPS54040 I VSENSE Rising VSENSE Falling VSENSE Rising VSENSE Falling - 100 125 T - Junction Temperature - °C J Figure 20. - 100 125 T - Junction Temperature - °C J Figure 22. = 0 100 125 T - Junction Temperature - °C J Figure 24. Copyright © 2009, Texas Instruments Incorporated www.ti.com 150 150 150 ...

  • Page 11

    ... The overload recovery circuit will slow start the output from the fault voltage to the nominal regulation voltage once a fault condition is removed. A frequency foldback circuit reduces the switching frequency during startup and overcurrent fault conditions to help control the inductor current. Copyright © 2009, Texas Instruments Incorporated OVERVIEW Product Folder Link(s): ...

  • Page 12

    ... PLL remains operating when in sleep mode. When operating at light load currents in the pulse skip mode, the switching transitions occur synchronously with the external clock signal. 12 Submit Documentation Feedback DETAILED DESCRIPTION Figure 25), then the peak switch current starts to decrease, Product Folder Link(s): TPS54040 www.ti.com Copyright © 2009, Texas Instruments Incorporated ...

  • Page 13

    ... MOSFET can remain on for 100% of the duty cycle to maintain output regulation, until the BOOT to PH voltage falls below 2.1V. Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) VOUT ...

  • Page 14

    ... Submit Documentation Feedback DETAILED DESCRIPTION (continued 5.4 5.2 5 4.8 4.6 0.15 0.20 0 Product Folder Link(s): TPS54040 www.ti.com Figure 26 and Figure Start Stop 0.05 0.10 0.15 0. Output Current - A O Figure 27. 5.0V Start/Stop Voltage Copyright © 2009, Texas Instruments Incorporated 27. ...

  • Page 15

    ... Another technique to add input voltage hysteresis is shown in resistance values are high from the previous method and a wider voltage hysteresis is needed. The resistor R3 sources additional hysteresis current into the EN pin. Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) Figure 28 to set the external hysteresis for the input voltage. Use ...

  • Page 16

    ... TPS54040 SLVS918 – MARCH 2009................................................................................................................................................................................................... START STOP OUT I + HYS R3 V ENA START ENA Submit Documentation Feedback DETAILED DESCRIPTION (continued) TPS54040 VIN Ihys VOUT R3 Figure 29. Adding Additional Hysteresis ENA R3 Product Folder Link(s): TPS54040 www.ti.com (4) (5) Copyright © 2009, Texas Instruments Incorporated ...

  • Page 17

    ... SS/TR pin to a voltage slightly greater than the VSENSE pin voltage using an internal pull down of 100 A when the error amplifier is changed to a high voltage from a fault condition. When the fault condition is removed, the output will slow start from the fault voltage to nominal output voltage. Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) 30. ...

  • Page 18

    ... TPS54040 devices. The power good is Figure 31. TPS54040 EN EN1 SS /TR PWRGD Figure 32. Sequential Startup using EN and PWRGD Figure 34. Ratio-Metric Startup using Coupled SS/TR Product Folder Link(s): TPS54040 PWRGD1 VOUT1 VOUT2 EN1, EN2 VOUT1 VOUT2 pins Copyright © 2009, Texas Instruments Incorporated www.ti.com ...

  • Page 19

    ... The SS/TR pin voltage needs to be greater than 1.3V for a complete handoff to the internal voltage reference as shown in Figure 23. Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) Equation 6. ...

  • Page 20

    ... Figure 36. Ratio-metric Startup with Tracking Resistors 20 Submit Documentation Feedback DETAILED DESCRIPTION (continued) Iss deltaV VOUT1 VOUT2 Figure 37. Ratiometric Startup with Tracking Resistors EN VOUT1 Figure 38. Simultaneous Startup With Tracking Resistor Product Folder Link(s): TPS54040 EN VOUT1 VOUT2 VOUT2 Copyright © 2009, Texas Instruments Incorporated www.ti.com (7) (8) (9) (10) ...

  • Page 21

    ... The frequency shift effectively increases the off time allowing the current to ramp down. Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) ...

  • Page 22

    ... Rdc V Vd OUT ÷ ) ÷ - ´ Rhs Vd ø L ö + Vd) OUTSC ÷ ) ÷ ø Skip Shift Input Voltage - V I Product Folder Link(s): TPS54040 www.ti.com Equation 5 Copyright © 2009, Texas Instruments Incorporated and (12) (13) ...

  • Page 23

    ... Figure 44 clock in continuous conduction mode (ccm) discontinuous conduction (dcm) and pulse skip mode (psm). Clock Source Figure 42. Synchronizing to a System Clock Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) and Figure 45 show the device synchronized to an external system TPS54040 10 pF ...

  • Page 24

    ... Also, the PWRGD is pulled low, if the UVLO or thermal shutdown are asserted or the EN pin pulled low. 24 Submit Documentation Feedback DETAILED DESCRIPTION (continued) PH EXT IL Figure 45. Plot of Synchronizing in PSM Product Folder Link(s): TPS54040 PH EXT IL Figure 44. Plot of Synchronizing in dcm Copyright © 2009, Texas Instruments Incorporated www.ti.com ...

  • Page 25

    ... COMP Figure 46. Small Signal Model for Loop Response Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) model the open loop gain and frequency response of the amplifier. The o PH Power Stage gm 1.9 A/V ...

  • Page 26

    ... Response for Peak Current Mode Control Equation 18 and Equation 19 show how to relate the frequency response of Figure 48. The open-loop gain and bandwidth are modeled using the R Product Folder Link(s): TPS54040 www.ti.com Figure 46) is the power stage Equation 15. fz (14) (15) (16) (17) Copyright © 2009, Texas Instruments Incorporated O ...

  • Page 27

    ... VSENSE Vref R2 Figure 48. Types of Frequency Compensation Aol A0 A1 Figure 49. Frequency Response of the Type 2A and Type 2B Frequency Compensation Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) are provided as a reference for those who prefer to compensate using the Type COMP ...

  • Page 28

    ... ( ´ ´ ´ ´ ( ´ ´ Submit Documentation Feedback DETAILED DESCRIPTION (continued) ö ÷ ø ö s ÷ p ´ ø type 2a O type 2b type 1 Product Folder Link(s): TPS54040 www.ti.com (18) (19) (20) (21) (22) (23) (24) (25) (26) (27) Copyright © 2009, Texas Instruments Incorporated ...

  • Page 29

    ... Choosing the lower of the two values and adding some margin a switching frequency of 700kHz is used. To determine the timing resistance for a given switching frequency, use The switching frequency is set by resistor R Figure 50. High Frequency, 5V Output Power Supply Design with Adjusted UVLO. Copyright © 2009, Texas Instruments Incorporated APPLICATION INFORMATION 5.0 V ΔVout = 4% ...

  • Page 30

    ... IND = 0.3 and the minimum inductor value is calculated For this Vout Vinmax ƒsw ´ OUT ö ´ Vinmax - V OUT ÷ ÷ ´ ´ ø Product Folder Link(s): TPS54040 28. = 0.3 may be used. IND Copyright © 2009, Texas Instruments Incorporated www.ti.com (28) (29) (30) (31) ...

  • Page 31

    ... Cout > ´ ´ ¦ ORIPPLE I RIPPLE Copyright © 2009, Texas Instruments Incorporated Equation 32 Figure is the maximum allowable output voltage ripple, and I oripple yields 0.49 F. Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 shows the minimum output capacitance 51. The output capacitor must also be ...

  • Page 32

    ... Submit Documentation Feedback - Vout ´ ¦ Equation 37 Equation ( Cj ´ ƒsw ´ Vin + Vƒd ´ Vƒ Equation 38. Product Folder Link(s): TPS54040 is used to calculate the total power 37, the selected diode will dissipate 0.290 2 ) Equation Copyright © 2009, Texas Instruments Incorporated www.ti.com (35) (36) (37) 39. ...

  • Page 33

    ... Bootstrap Capacitor Selection A 0.1- F ceramic capacitor must be connected between the BOOT and PH pins for proper operation recommended to use a ceramic capacitor with X5R or better grade dielectric. The capacitor should have a 10V or higher voltage rating. Copyright © 2009, Texas Instruments Incorporated ( ) Vin min ...

  • Page 34

    ... Assume the power stage transconductance, Product Folder Link(s): TPS54040 www.ti.com calculated as 52.5 kΩ. The Equation 41 Equation 43 and Equation 44, to estimate Equation 43 yields 33.7 kHz and for an initial crossover frequency. Equation 46 yields 2754 pF for Copyright © 2009, Texas Instruments Incorporated and (41) (42) (43) (44) ...

  • Page 35

    ... With an input voltage of 34V, the power supply enters discontinuous mode when the output current is less than 50mA. The power supply enters EcoMode when the output current is lower than 30mA. The input current draw at no load is 235 A. APPLICATION CURVES Figure 51. Load Transient Figure 53. Output Ripple CCM Copyright © 2009, Texas Instruments Incorporated ö V out ÷ ´ ...

  • Page 36

    ... Figure 56. Input Ripple CCM 5.0 V OUT 0.10 0.15 0.20 0.25 0.30 0.35 0.40 0. Output Current - A O Figure 58. Efficiency vs Load Current Phase Gain 1-10 1-10 1-10 1- Frequency - Hz Copyright © 2009, Texas Instruments Incorporated 0.50 180 150 120 -30 -60 -90 -120 -150 -180 6 ...

  • Page 37

    ... Load Current - A Figure 61. Regulation vs Load Current Copyright © 2009, Texas Instruments Incorporated 0.1 0.08 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 12 0.3 0.35 0.4 0.45 0.5 ...

  • Page 38

    ... There will be additional power losses in the regulator circuit due to the inductor ac and dc losses, the catch diode and trace resistance that will impact the overall efficiency of the regulator. 38 Submit Documentation Feedback - 9 10 ´ Product Folder Link(s): TPS54040 www.ti.com (49) (50) (51) (52) (53) (54) (55) Copyright © 2009, Texas Instruments Incorporated ...

  • Page 39

    ... Resistors Slow Start Capacitor Estimated Circuit Area The estimated printed circuit board area for the components used in the design of does not include test points or connectors. Copyright © 2009, Texas Instruments Incorporated Vout Output Capacitor Route Boot Capacitor Trace on another layer to provide wide path for ...

  • Page 40

    ... VIN VIN Cd GND EN SS/TR Css Figure 64. +24V to - 12V Inverting Power Supply from SLVA317 Application Note 40 Submit Documentation Feedback + C Cboot IN Lo BOOT PH R2 VSENSE COMP Rcomp RT/CLK RT Czero Product Folder Link(s): TPS54040 www.ti.com GND VOUT Cpole Copyright © 2009, Texas Instruments Incorporated ...

  • Page 41

    ... PACKAGING INFORMATION (1) Orderable Device Status TPS54040DGQ ACTIVE TPS54040DGQR ACTIVE (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design ...

  • Page 42

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing TPS54040DGQR MSOP- DGQ Power PAD TPS54040DGQR MSOP- DGQ Power PAD PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 10 2500 330.0 12.4 5.3 10 2500 330.0 12 ...

  • Page 43

    ... Device Package Type TPS54040DGQR MSOP-PowerPAD TPS54040DGQR MSOP-PowerPAD PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) DGQ 10 2500 DGQ 10 2500 Pack Materials-Page 2 17-Dec-2010 Width (mm) Height (mm) 364.0 364.0 27.0 346.0 346.0 35.0 ...

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    ... Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’ ...