IC DC-DC CONV STP-DN SYNC 10SON

TPS54040QDRCRQ1

Manufacturer Part NumberTPS54040QDRCRQ1
DescriptionIC DC-DC CONV STP-DN SYNC 10SON
ManufacturerTexas Instruments
SeriesSWIFT™, Eco-Mode™
TypeStep-Down (Buck)
TPS54040QDRCRQ1 datasheet
 


Specifications of TPS54040QDRCRQ1

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-SON
Lead Free Status / RoHS StatusLead free / RoHS CompliantPower - Output-
Other namesTPS54040QDRCRQ1  
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0.5-A 42-V STEP-DOWN SWIFT™ DC/DC CONVERTER WITH Eco-mode™
FEATURES
1
Qualified for Automotive Applications
3.5-V to 42-V Input Voltage Range
200-mΩ High-Side MOSFET
High Efficiency at Light Loads with a Pulse
Skipping Eco-Mode™ Control Scheme
116-μA Operating Quiescent Current
1.3-μA Shutdown Current
100-kHz to 2.5-MHz Switching Frequency
Synchronizes to External Clock
Adjustable Slow Start/Sequencing
Undervoltage and Overvoltage Power Good
Output
DESCRIPTION
The TPS54040 device is a 42-V 0.5-A 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 μA. Using the enable pin, shutdown supply current is
reduced to 1.3 μA, when the enable pin is low.
Undervoltage lockout is internally set at 2.5 V, 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 a 10-pin thermally enhanced MSOP PowerPAD™ package (DGQ) and a 10-pin
SON package (DRC).
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.
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.
SLVSA26B – JANUARY 2010 – REVISED MARCH 2011
Check for Samples:
TPS54040-Q1
Adjustable Undervoltage Lockout Voltage and
Hysteresis
0.8-V Internal Voltage Reference
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
Copyright © 2010–2011, Texas Instruments Incorporated
TPS54040-Q1
EFFICIENCY
vs
LOAD CURRENT
V = 12 V,
I
V = 5.0 V,
O
f
= 700 kHz
sw
0.1
0.2
0.3
0.4
0.5
Load Current - A

TPS54040QDRCRQ1 Summary of contents

  • Page 1

    ... APPLICATIONS • 12-V and 24-V Industrial and Commercial Low Power Systems • Aftermarket Auto Accessories: Video, GPS, Entertainment 100 Copyright © 2010–2011, Texas Instruments Incorporated TPS54040-Q1 EFFICIENCY vs LOAD CURRENT 5 700 kHz sw 0.1 0.2 0.3 0.4 0.5 Load Current - A ...

  • Page 2

    ... Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. (2) See Enable and Adjusting Undervoltage Lockout 2 Submit Documentation Feedback ORDERING INFORMATION ORDERABLE PART NUMBER Reel of 2500 TPS54040QDGQRQ1 Reel of 3000 TPS54040QDRCRQ1 (1) 200ns 30ns Maximum dc voltage, Tj=-40C for details. Product Folder Link(s): TPS54040-Q1 www.ti.com TOP-SIDE MARKING ...

  • Page 3

    ... Error amplifier bandwidth Error amplifier source/sink COMP to switch current transconductance CURRENT LIMIT Current limit threshold Copyright © 2010–2011, Texas Instruments Incorporated (1) (2) (3) should be determined with a junction temperature of 150°C. This is the point where A TEST CONDITIONS No voltage hysteresis, rising and falling 25° ...

  • Page 4

    ... ELECTRICAL CHARACTERISTICS (continued –40°C to 150°C, VIN = 3.5 to 42V (unless otherwise noted) J PARAMETER THERMAL SHUTDOWN Thermal shutdown 4 Submit Documentation Feedback TEST CONDITIONS Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54040-Q1 www.ti.com MIN TYP MAX UNIT 182 °C ...

  • Page 5

    ... POWER GOOD (PWRGD PIN) V VSENSE threshold VSENSE Hysteresis Output high leakage On resistance Minimum VIN for defined output Copyright © 2010–2011, Texas Instruments Incorporated SLVSA26B – JANUARY 2010 – REVISED MARCH 2011 TEST CONDITIONS VIN = 12 V VIN = 200 kΩ T VIN = 12 V VIN = 12 V ...

  • Page 6

    ... Input supply voltage, 3 VSENSE 7 I Inverting node of the transconductance ( gm) error amplifier. 6 Submit Documentation Feedback DEVICE INFORMATION MSOP10 (TOP VIEW Thermal Pad 3 8 (11 PIN FUNCTIONS DESCRIPTION Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54040-Q1 www.ti.com PH GND COMP VSENSE PWRGD ...

  • Page 7

    ... FUNCTIONAL BLOCK DIAGRAM Shutdown UV Logic OV Voltage Reference ERROR AMPLIFIER VSENSE 7 4 SS/TR Shutdown 8 COMP Maximum Overload Recovery Copyright © 2010–2011, Texas Instruments Incorporated PWRGD Enable Comparator Shutdown Enable Threshold Minimum Clamp Pulse Skip PWM Comparator Logic And PWM Latch Slope ...

  • Page 8

    ... Product Folder Link(s): TPS54040-Q1 www.ti.com I - 100 125 T - Junction Temperature - °C J Figure 100 125 T - Junction Temperature - °C J Figure 4. FREQUENCY RANGE 25°C J 400 500 600 700 800 900 1000 1100 RT/CLK - Resistance - kW Figure 6. Copyright © 2010–2011, Texas Instruments Incorporated 150 150 1200 ...

  • Page 9

    ... T - Junction Temperature - °C J Figure 9. EN PIN CURRENT vs JUNCTION TEMPERATURE -0 Threshold -50 mV I(EN) -0.85 -0.9 -0. -50 - Junction Temperature - °C J Figure 11. Copyright © 2010–2011, Texas Instruments Incorporated EA TRANSCONDUCTANCE vs JUNCTION TEMPERATURE 150 130 110 -50 100 125 150 EN PIN CURRENT vs JUNCTION TEMPERATURE -3. I(EN) -3.5 -3.75 -4 -4.25 75 ...

  • Page 10

    ... VIN SUPPLY CURRENT vs INPUT VOLTAGE 140 I(VSENSE) 130 120 110 100 90 0 100 125 150 Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54040-Q1 www.ti.com 0.2 0.4 0.6 0 SENSE Figure 14 Input Voltage - V I Figure 16 0.83 V ...

  • Page 11

    ... SS/TR TO VSENSE OFFSET vs VSENSE 500 400 300 200 100 0 0 100 200 300 400 500 VSENSE - mV Figure 23. Copyright © 2010–2011, Texas Instruments Incorporated PWRGD THRESHOLD vs JUNCTION TEMPERATURE 115 110 105 100 VSENSE Rising -50 -25 125 100 150 INPUT VOLTAGE (UVLO) vs JUNCTION TEMPERATURE 3 2.75 2 ...

  • Page 12

    ... 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. 12 Submit Documentation Feedback OVERVIEW Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54040-Q1 www.ti.com ...

  • Page 13

    ... 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. Copyright © 2010–2011, Texas Instruments Incorporated SLVSA26B – JANUARY 2010 – REVISED MARCH 2011 ...

  • Page 14

    ... MOSFET can remain on for 100% of the duty cycle to maintain output regulation, until the BOOT to PH voltage falls below 2.1V. 14 Submit Documentation Feedback VOUT (ac Figure 25. Pulse Skip Mode Operation Product Folder Link(s): TPS54040-Q1 www.ti.com Copyright © 2010–2011, Texas Instruments Incorporated ...

  • Page 15

    ... Start with a 10 kΩ for the R2 resistor and use the calculate R1. To improve efficiency at light loads consider using larger value resistors. If the values are too high the regulator will be more susceptible to noise and voltage errors from the VSENSE input current will be noticeable Copyright © 2010–2011, Texas Instruments Incorporated 5 3 ...

  • Page 16

    ... VIN Ihys Figure TPS54040 VIN Ihys VOUT R3 Figure 29. Adding Additional Hysteresis Product Folder Link(s): TPS54040-Q1 www.ti.com to adjust the input voltage UVLO by using Equation 3 to set the 29. This method may be used, if the Copyright © 2010–2011, Texas Instruments Incorporated (1) (2) (3) ...

  • Page 17

    ... DETAILED DESCRIPTION (continued START STOP OUT I + HYS R3 V ENA START ENA ENA Copyright © 2010–2011, Texas Instruments Incorporated SLVSA26B – JANUARY 2010 – REVISED MARCH 2011 Product Folder Link(s): TPS54040-Q1 TPS54040-Q1 (4) (5) Submit Documentation Feedback 17 ...

  • Page 18

    ... Submit Documentation Feedback ) is 2μA. The slow start capacitor should SS 30. EN SS/TR V SENSE VOUT Product Folder Link(s): TPS54040-Q1 www.ti.com Equation Copyright © 2010–2011, Texas Instruments Incorporated 6. (6) ...

  • Page 19

    ... SS/TR pins together. The regulator outputs will ramp up and reach regulation at the same time. When calculating the slow start time the pull up current source must be doubled in Copyright © 2010–2011, Texas Instruments Incorporated Figure 31 using two TPS54040 devices. The power good is Figure 31 ...

  • Page 20

    ... Vout1 and Vout2 Equation 7 through Equation 9 is greater than the value calculated in deltaV Product Folder Link(s): TPS54040-Q1 www.ti.com VOUT 1 VOUT 2 R3 for deltaV. Equation 9 will result in a Equation 10 to ensure the device can Copyright © 2010–2011, Texas Instruments Incorporated (7) (8) (9) (10) ...

  • Page 21

    ... DETAILED DESCRIPTION (continued) EN Figure 36. Ratiometric Startup with VOUT2 Leading Figure 37. Ratiometric Startup with VOUT1 Leading VOUT1 Figure 38. Simultaneous Startup With Tracking Resistor Copyright © 2010–2011, Texas Instruments Incorporated VOUT1 VOUT2 EN VOUT1 Product Folder Link(s): TPS54040-Q1 TPS54040-Q1 SLVSA26B – JANUARY 2010 – REVISED MARCH 2011 ...

  • Page 22

    ... T = 25°C J 400 300 200 100 0 200 300 125 150 175 200 Product Folder Link(s): TPS54040-Q1 www.ti.com SWITCHING FREQUENCY 25°C J 400 500 600 700 800 900 1000 1100 RT/CLK - Resistance - kW Figure 40. Low Range RT Copyright © 2010–2011, Texas Instruments Incorporated (11) 1200 ...

  • Page 23

    ... ON ƒ frequency divide equals ( DIV 2500 2000 1500 1000 500 0 Figure 41. Maximum Switching Frequency vs. Input Voltage Copyright © 2010–2011, Texas Instruments Incorporated 13, to calculate the maximum switching frequency one must take into ) Rdc V Vd ö OUT ÷ ) ÷ ...

  • Page 24

    ... Source Figure 42. Synchronizing to a System Clock 24 Submit Documentation Feedback and Figure 45 show the device synchronized to an external system TPS54040 PLL R fset RT/CLK EXT 50 W Product Folder Link(s): TPS54040-Q1 www.ti.com Figure 42 through a 50Ω resistor to Copyright © 2010–2011, Texas Instruments Incorporated ...

  • Page 25

    ... The PWRGD defined state once the VIN input voltage is greater than 1.5V but with reduced current sinking capability. The PWRGD will achieve full current sinking capability as VIN input voltage approaches 3V. Copyright © 2010–2011, Texas Instruments Incorporated PH EXT Figure 44 ...

  • Page 26

    ... This equivalent model is only valid for continuous conduction mode designs. 26 Submit Documentation Feedback model the open loop gain and frequency response of the amplifier. The o Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54040-Q1 www.ti.com with a L ...

  • Page 27

    ... ESR zero at the lower frequencies (see Figure 47. Simple Small Signal Model and Frequency Response for Peak Current Mode Control Copyright © 2010–2011, Texas Instruments Incorporated PH Power Stage gm 1.9 A/V ps VSENSE ...

  • Page 28

    ... Figure 48. The open-loop gain and bandwidth are modeled using the R are provided as a reference for those who prefer to compensate using the Type COMP Product Folder Link(s): TPS54040-Q1 www.ti.com Type 2B Type Copyright © 2010–2011, Texas Instruments Incorporated (14) (15) (16) (17) O ...

  • Page 29

    ... ( ´ ´ ´ ´ ( ´ ´ Copyright © 2010–2011, Texas Instruments Incorporated ö ÷ ø ö s ÷ ´ ø P2 type 2a O type 2b type 1 Product Folder Link(s): TPS54040-Q1 TPS54040-Q1 SLVSA26B – JANUARY 2010 – REVISED MARCH 2011 BW Submit Documentation Feedback (18) ...

  • Page 30

    ... TPS54040. For this example, the output voltage is 5.0 V Equation 13 Equation 11 shown in Figure 50. 3 Product Folder Link(s): TPS54040-Q1 www.ti.com Equation 12. To ensure overcurrent or the solid curve in Figure 41 or the curve in Figure 39. Copyright © 2010–2011, Texas Instruments Incorporated to ...

  • Page 31

    ... The regulator usually needs two or more clock cycles for the control loop Copyright © 2010–2011, Texas Instruments Incorporated ) Equation 28 ...

  • Page 32

    ... Product Folder Link(s): TPS54040-Q1 www.ti.com shows the minimum output capacitance 51. The output capacitor must also be Equation 33 is the output under light load the yields a minimum capacitance is the ripple Equation 36 can be used Equation 36 yields Copyright © 2010–2011, Texas Instruments Incorporated is (32) (33) (34) ...

  • Page 33

    ... The input voltage ripple can be calculated using Using the design example values, Ioutmax = 0.5 A, Cin = 4.4μF, ƒsw = 500 kHz, yields an input voltage ripple of 40.6 mV and a rms input ripple current of 0.247A. Copyright © 2010–2011, Texas Instruments Incorporated Vout ´ ...

  • Page 34

    ... Product Folder Link(s): TPS54040-Q1 www.ti.com DIALECTRIC COMMENTS GRM32 series GRM31 series VJ X7R series X7R C series C4532 C series C3225 X7R dielectric series Equation 6. For the Copyright © 2010–2011, Texas Instruments Incorporated (38) (39) (40) ...

  • Page 35

    ... ´ ´ p ´ Copyright © 2010–2011, Texas Instruments Incorporated can be used to calculate the resistance values necessary. For the example Equation Equation 43 or Equation 44 Equation 45. Assume the power stage transconductance, V ö out ÷ ´ gmea ø ...

  • Page 36

    ... Figure 51. Load Transient Figure 53. Output Ripple CCM 36 Submit Documentation Feedback and Equation 48 to calculate the C6, to set the compensation pole. Figure 52. Startup With VIN Figure 54. Output Ripple, DCM Copyright © 2010–2011, Texas Instruments Incorporated Product Folder Link(s): TPS54040-Q1 www.ti.com (47) (48) ...

  • Page 37

    ... Figure 55. Output Ripple, PSM Figure 57. Input Ripple DCM 100 Vin = 24 V Vin = Vin = 0.02 0.04 0. Output Current - A O Figure 59. Light Load Efficiency Copyright © 2010–2011, Texas Instruments Incorporated Figure 56. Input Ripple CCM 100 0.05 Figure 58. Efficiency vs Load Current Vin = 12 V Vin = 15 V ...

  • Page 38

    ... Load Current - A Figure 61. Regulation vs Load Current 38 Submit Documentation Feedback 0 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 12 0.35 0.4 0.45 0.5 Figure 62. Regulation vs Input Voltage Product Folder Link(s): TPS54040-Q1 www.ti.com Input Voltage - V I Copyright © 2010–2011, Texas Instruments Incorporated 42 ...

  • Page 39

    ... AMAX 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. Copyright © 2010–2011, Texas Instruments Incorporated - 9 10 ´ ...

  • Page 40

    ... GND EN COMP SS/TR VSENSE PWRGD RT/CLK Frequency Set Resistor Figure 63. PCB Layout Example Product Folder Link(s): TPS54040-Q1 www.ti.com Output Inductor Catch Diode Compensation Resistor Network Divider Thermal VIA Signal VIA 2 Figure This area Copyright © 2010–2011, Texas Instruments Incorporated ...

  • Page 41

    ... VIN VIN Cd GND EN SS/TR Css Figure 64. +24V to - 12V Inverting Power Supply from SLVA317 Application Note Copyright © 2010–2011, Texas Instruments Incorporated + Cboot BOOT VSENSE COMP Rcomp RT/CLK RT Czero Product Folder Link(s): TPS54040-Q1 TPS54040-Q1 SLVSA26B – JANUARY 2010 – REVISED MARCH 2011 ...

  • Page 42

    ... Package Type Package Status TPS54040QDGQRQ1 ACTIVE MSOP- PowerPAD TPS54040QDRCRQ1 ACTIVE SON (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 43

    Catalog - TI's standard catalog product PACKAGE OPTION ADDENDUM Addendum-Page 2 3-Mar-2011 ...

  • Page 44

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing TPS54040QDGQRQ1 MSOP- DGQ Power PAD TPS54040QDRCRQ1 SON DRC PACKAGE MATERIALS INFORMATION Pins SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 10 2500 330.0 12.4 5.3 10 3000 330.0 12.4 3.3 ...

  • Page 45

    ... Device Package Type TPS54040QDGQRQ1 MSOP-PowerPAD TPS54040QDRCRQ1 SON PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) DGQ 10 2500 DRC 10 3000 Pack Materials-Page 2 2-Mar-2011 Width (mm) Height (mm) 370.0 355.0 55.0 370.0 355.0 55.0 ...

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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’ ...