TPS54040

Manufacturer Part NumberTPS54040
ManufacturerTexas Instruments
TPS54040 datasheet
 


Specifications of TPS54040

Iout(max)(a)0.5Vin(min)(v)3.5
Vin(max)(v)42Vout(min)(v)0.8
Vout(max)(v)39Iq(typ)(ma)0.116
Switching Frequency(max)(khz)2500Switch Current Limit(typ)(a)0.6
TopologyBuck,Inverting Buck-BoostOperating Temperature Range(c)-40 to 150
Pin/package10MSOP-PowerPADDuty Cycle(max)(%)98
Regulated Outputs(#)1  
1
Page 1
2
Page 2
3
Page 3
4
Page 4
5
Page 5
6
Page 6
7
Page 7
8
Page 8
9
Page 9
10
Page 10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
Page 1/48

Download datasheet (3Mb)Embed
Next
www.ti.com...................................................................................................................................................................................................
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

TPS54040 Summary of contents

  • Page 1

    ... 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 ...

  • 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

    ... COMP –2 A < I < COMP COMP 0.4 V VSENSE V = 0.8 V VSENSE 100 mV overdrive (COMP) VIN = 25°C J Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 (1) 57 °C/W MIN TYP MAX UNIT 3 2.5 V 1.3 4 116 136 0.9 1.25 1.55 V –3.8 –0.9 – ...

  • Page 4

    ... VSENSE = 0 V, V(SS/TR) = 0.4 V VSENSE = 0 V VSENSE falling VSENSE rising VSENSE rising VSENSE falling VSENSE falling VSENSE = VREF, V(PWRGD) = 5.5 V, 25°C I(PWRGD mA, VSENSE < 0.79 V 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 ...

  • Page 5

    ... Inverting node of the transconductance ( gm) error amplifier. Copyright © 2009, Texas Instruments Incorporated DEVICE INFORMATION MSOP10 (TOP VIEW Thermal Pad 3 8 (11 PIN FUNCTIONS DESCRIPTION Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 PH GND COMP VSENSE PWRGD Submit Documentation Feedback 5 ...

  • 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 LOW 500 25°C J 400 300 200 100 0 125 150 175 200 200 Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 - 100 T - Junction Temperature - °C J Figure ...

  • Page 8

    ... -3.5 -3.75 -4 -4.25 75 150 100 -50 125 SS/TR CHARGE CURRENT vs JUNCTION TEMPERATURE - -1.5 -2 -2.5 -3 150 75 100 125 -50 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. ...

  • Page 9

    ... Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 SWITCHING FREQUENCY vs VSENSE 25°C J 0.2 0.4 0 SENSE Figure 14 25° Input Voltage - V I Figure 16. ...

  • Page 10

    ... SS/TR TO VSENSE OFFSET vs TEMPERATURE 60 V (SS/TR -50 500 600 700 800 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 - ° ...

  • Page 11

    ... The device has an internal phase lock loop (PLL) on the RT/CLK pin that is used to synchronize the power switch turn falling edge of an external system clock. The TPS54040 has a default start up voltage of approximately 2.5V. The EN pin has an internal pull-up current source that can be used to adjust the input voltage under voltage lockout (UVLO) threshold with two external resistors ...

  • Page 12

    ... The TPS54040 operates in a pulse skip Eco mode at light load currents to improve efficiency by reducing switching and gate drive losses. The TPS54040 is designed so that if the output voltage is within regulation and the peak switch current at the end of any switching cycle is below the pulse skipping current threshold, the device enters Eco mode ...

  • Page 13

    ... A ceramic capacitor with an X7R or X5R grade dielectric with a voltage rating of 10V or higher is recommended because of the stable characteristics overtemperature and voltage. To improve drop out, the TPS54040 is designed to operate at 100% duty cycle as long as the BOOT to PH pin voltage is greater than 2.1V. When the voltage from BOOT to PH drops below 2.1V, the high side MOSFET is turned off using an UVLO circuit which allows the low side diode to conduct and refresh the charge on the BOOT capacitor ...

  • Page 14

    ... Figure 26. 3.3V Start/Stop Voltage Error Amplifier The TPS54040 has a transconductance amplifier for the error amplifier. The error amplifier compares the VSENSE voltage to the lower of the SS/TR pin voltage or the internal 0.8V voltage reference. The transconductance (gm) of the error amplifier is 97 A/V during normal operation. During the slow start operation, the transconductance is a fraction of the normal operating gm ...

  • Page 15

    ... The EN pin has an internal pull-up current source, I1, of 0.9 A that provides the default condition of the TPS54040 operating when the EN pin floats. Once the EN pin voltage exceeds 1.25V, an additional 2 hysteresis, Ihys, is added. This additional current facilitates input voltage hysteresis ...

  • Page 16

    ... 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

    ... Css(nF) = Vref (V) 0.8 ´ At power up, the TPS54040 will not start switching until the slow start pin is discharged to less than ensure a proper power up, see Figure Also, during normal operation, the TPS54040 will stop switching and the SS/TR must be discharged to 40 mV, when the VIN UVLO is exceeded, EN pin pulled below 1.25V thermal shutdown event occurs. ...

  • Page 18

    ... The sequential method can be implemented using an open drain output of a power on reset pin of another device. The sequential method is illustrated in coupled to the EN pin on the TPS54040 which will enable the second power supply once the primary supply reaches regulation. If needed, a 1nF ceramic capacitor on the EN pin of the second power supply will provide a 1ms start up delay ...

  • Page 19

    ... Vout2 Equation 9 is the voltage difference between Vout1 and Vout2 Equation 7 through Equation 9 is greater than the value calculated in Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 Figure 33. VOUT 1 VOUT 2 R3 for deltaV. Equation 9 ...

  • 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

    ... Figure 39. High Range RT Overcurrent Protection and Frequency Shift The TPS54040 implements current mode control which uses the COMP pin voltage to turn off the high side MOSFET on a cycle by cycle basis. Each cycle the switch current and COMP pin voltage are compared, when the peak switch current intersects the COMP voltage, the high side switch is turned off ...

  • 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

    ... Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) and Figure 45 show the device synchronized to an external system TPS54040 fset RT/CLK EXT 50 W Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 Figure 42 through a 50Ω resistor to PLL Submit Documentation Feedback 23 ...

  • 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

    ... SS/TR pin. Small Signal Model for Loop Response Figure 46 shows an equivalent model for the TPS54040 control loop which can be modeled in a circuit simulation program to check frequency response and dynamic load response. The error amplifier is a transconductance amplifier with A/V. The error amplifier can be modeled using an ideal voltage controlled current EA source ...

  • Page 26

    ... OUT ESR Small Signal Model for Frequency Compensation The TPS54040 uses a transconductance amplifier for the error amplifier and readily supports three of the commonly-used frequency compensation circuits. Compensation circuits Type 2A, Type 2B, and Type 1 are shown in Figure 48. Type 2 circuits most likely implemented in high bandwidth power-supply designs using low ESR output capacitors ...

  • Page 27

    ... Copyright © 2009, Texas Instruments Incorporated DETAILED DESCRIPTION (continued) are provided as a reference for those who prefer to compensate using the Type COMP Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 Type 2B Type Submit Documentation Feedback 27 ...

  • 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

    ... Figure 50. High Frequency, 5V Output Power Supply Design with Adjusted UVLO. Copyright © 2009, Texas Instruments Incorporated APPLICATION INFORMATION 5.0 V ΔVout = 4% 0 nom. 12V Vout 8 130 ns for the 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 TPS54040 SLVS918 – ...

  • Page 30

    ... H. 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

    ... 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 Equation 33 is the output under light load the OL Equation 33 ...

  • Page 32

    ... Vin max Input Capacitor The TPS54040 requires a high quality ceramic, type X5R or X7R, input decoupling capacitor of at least effective capacitance and in some applications a bulk capacitance. The effective capacitance includes any dc bias effects. The voltage rating of the input capacitor must be greater than the maximum input voltage. The capacitor must also have a ripple current rating greater than the maximum input current ripple of the TPS54040 ...

  • Page 33

    ... The large currents necessary to charge the capacitor may make the TPS54040 reach the current limit or excessive current draw from the input power supply may cause the input voltage rail to sag. Limiting the output voltage slew rate solves both of these problems. ...

  • Page 34

    ... The Under Voltage Lock Out (UVLO) can be adjusted using an external voltage divider on the EN pin of the TPS54040. The UVLO has two thresholds, one for power up when the input voltage is rising and one for power down or brown outs when the input voltage is falling. For the example design, the supply should turn on and start switching once the input voltage increases above 8 ...

  • Page 35

    ... Copyright © 2009, Texas Instruments Incorporated ö V out ÷ ´ gmea ø and Equation 48 to calculate the C6, to set the compensation pole. Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 Figure 52. Startup With VIN Figure 54. Output Ripple, DCM Submit Documentation Feedback (45) (46) (47) (48) 35 ...

  • Page 36

    ... Vin = 12 V Vin = -20 - 5.0 V OUT -60 0.08 0.10 100 Figure 60. Overall Loop Frequency Response Product Folder Link(s): TPS54040 www.ti.com 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 ...

  • Page 37

    ... 0.06 0.04 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.1 0.00 0.05 0.1 0.15 0.2 0.25 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 Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 Input Voltage - V I Figure 62. Regulation vs Input Voltage Submit Documentation Feedback 42 37 ...

  • 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) ...

  • Page 39

    ... BOOT PH VIN GND EN COMP SS/TR VSENSE PWRGD RT/CLK Frequency Set Resistor Figure 63. PCB Layout Example Product Folder Link(s): TPS54040 TPS54040 SLVS918 – MARCH 2009 Output Inductor Catch Diode Compensation Resistor Network Divider Thermal VIA Signal VIA 2 Figure This area ...

  • Page 40

    ... 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

    ... TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold Customer on an annual basis. OTHER QUALIFIED VERSIONS OF TPS54040 : Automotive: TPS54040-Q1 • ...

  • Page 42

    Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects PACKAGE OPTION ADDENDUM Addendum-Page 2 9-Feb-2012 ...

  • Page 43

    ... TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Type Drawing 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 Pack Materials-Page 1 20-Feb-2012 Pin1 (mm) (mm) (mm) ...

  • Page 44

    ... Device Package Type TPS54040DGQR MSOP-PowerPAD PACKAGE MATERIALS INFORMATION Package Drawing Pins SPQ Length (mm) DGQ 10 2500 Pack Materials-Page 2 20-Feb-2012 Width (mm) Height (mm) 364.0 364.0 27.0 ...

  • Page 45

    ...

  • Page 46

    ...

  • Page 47

    ...

  • Page 48

    ... 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’ ...