Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsLMZ31506RUQT

100

0 1 2 3 4 5 6

Output Current (A)

Efficiency (%)

= V

= 5 V

= V

= 12 V

OUT

= 3.3 V

= 630 kHz

G000

LMZ31506

PWRGD

SENSE+

VOUT

VIN

PVIN

INH/UVLO

RT/CLK

VADJ

SS/TR

STSEL

AGND

PGND

SET

OUT

ISHARE

LMZ31506

www.ti.com

SNVS993 –JUNE 2013

6A SIMPLE SWITCHER

Power Module with 2.95V-14.5V Input and Current Sharing

in QFN Package

Check for Samples: LMZ31506

FEATURES

DESCRIPTION

The LMZ31506 SIMPLE SWITCHER® power module

• Complete Integrated Power Solution Allows

is an easy-to-use integrated power solution that

Small Footprint, Low-Profile Design

combines a 6-A DC-to-DC converter with power

• 9mm x 15mm x 2.8mm package

MOSFETs, a shielded inductor, and passives into a

- Pin Compatible with LMZ31503

low profile, QFN package. This total power solution

allows as few as three external components and

• Efficiencies Up To 96%

eliminates the loop compensation and magnetics part

• Wide-Output Voltage Adjust

selection process.

0.6 V to 5.5 V, with 1% Reference Accuracy

The 9×15×2.8 mm QFN package is easy to solder

• Supports Parallel Operation for Higher Current

onto a printed circuit board and allows a compact

• Optional Split Power Rail allows

point-of-load design with greater than 90% efficiency

input voltage down to 1.6 V

and excellent power dissipation with a thermal

• Adjustable Switching Frequency

impedance of 13°C/W junction to ambient. The

device delivers the full 6-A rated output current at

(250 kHz to 780 kHz)

85°C ambient temperature without airflow.

• Synchronizes to an External Clock

The LMZ31506 offers the flexibility and the feature-

• Adjustable Slow-Start

set of a discrete point-of-load design and is ideal for

• Output Voltage Sequencing / Tracking

powering performance DSPs and FPGAs. Advanced

• Power Good Output

packaging technology afford a robust and reliable

power solution compatible with standard QFN

• Programmable Undervoltage Lockout (UVLO)

mounting and testing techniques.

• Output Overcurrent Protection (Hiccup Mode)

• Over-Temperature Protection

SIMPLIFIED APPLICATION

• Pre-bias Output Start-up

• Operating Temperature Range: –40°C to 85°C

• Enhanced Thermal Performance: 13°C/W

• Meets EN55022 Class B Emissions

- Integrated Shielded Inductor

APPLICATIONS

• Broadband & Communications Infrastructure

• Automated Test and Medical Equipment

• Compact PCI, PCI Express and PXI Express

• DSP and FPGA Point of Load Applications

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.

2SIMPLE SWITCHER is a registered trademark of Texas Instruments.

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.

Summary of content (33 pages)

PAGE 1
LMZ31506 www.ti.com SNVS993 – JUNE 2013 6A SIMPLE SWITCHER® Power Module with 2.95V-14.5V Input and Current Sharing in QFN Package Check for Samples: LMZ31506 FEATURES DESCRIPTION • The LMZ31506 SIMPLE SWITCHER® power module is an easy-to-use integrated power solution that combines a 6-A DC-to-DC converter with power MOSFETs, a shielded inductor, and passives into a low profile, QFN package.
PAGE 2
LMZ31506 SNVS993 – JUNE 2013 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
PAGE 3
LMZ31506 www.ti.com SNVS993 – JUNE 2013 THERMAL INFORMATION LMZ31506 THERMAL METRIC (1) RUQ47 UNIT 47 PINS Junction-to-ambient thermal resistance (2) θJA 13 (3) θJCtop Junction-to-case (top) thermal resistance θJCbot Junction-to-case (bottom) thermal resistance θJB Junction-to-board thermal resistance ψJT Junction-to-top characterization parameter (6) ψJB Junction-to-board characterization parameter (7) (1) (2) (3) (4) (5) (6) (7) 9 (4) (5) 3.8 °C/W 6 2.
PAGE 4
LMZ31506 SNVS993 – JUNE 2013 www.ti.com ELECTRICAL CHARACTERISTICS Over –40°C to 85°C free-air temperature, PVIN = VIN = 12 V, VOUT = 1.8 V, IOUT = 6 A, CIN1 = 2 x 22 µF ceramic, CIN2 = 68 µF poly-tantalum, COUT1 = 4 x 47 µF ceramic (unless otherwise noted) PARAMETER TEST CONDITIONS IOUT Output current TA = 85°C, natural convection VIN Input bias voltage range PVIN Input switching voltage range MIN TYP A Over IOUT range 4.5 14.5 V Over IOUT range 1.6 (1) 14.5 (2) V VIN = increasing 4.
PAGE 5
LMZ31506 www.ti.com SNVS993 – JUNE 2013 ELECTRICAL CHARACTERISTICS (continued) Over –40°C to 85°C free-air temperature, PVIN = VIN = 12 V, VOUT = 1.
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LMZ31506 SNVS993 – JUNE 2013 www.ti.com PIN DESCRIPTIONS TERMINAL NAME DESCRIPTION NO. 1 2 AGND 34 Zero VDC reference for the analog control circuitry. Connect AGND to PGND at a single point. Connect near the output capacitors. See Figure 43 for a recommended layout. 45 8 INH/UVLO ISHARE 9 5 Inhibit and UVLO adjust pin. Use an open drain or open collector output logic to control the INH function. A resistor divider between this pin, AGND and VIN adjusts the UVLO voltage.
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LMZ31506 www.ti.com SNVS993 – JUNE 2013 PIN DESCRIPTIONS (continued) TERMINAL NAME DESCRIPTION NO. 21 24 25 VOUT 26 27 Output voltage. Connect output capacitors between these pins and PGND.
PAGE 8
LMZ31506 SNVS993 – JUNE 2013 www.ti.com 100 95 90 85 80 75 70 65 60 55 50 45 40 VOUT = 5.0 V, fSW = 780 kHz VOUT = 3.3 V, fSW = 630 kHz VOUT = 2.5 V, fSW = 480 kHz VOUT = 1.8 V, fSW = 480 kHz VOUT = 1.2 V, fSW = 480 kHz VOUT = 0.8 V, fSW = 480 kHz 80 VOUT = 5.0 V, fSW = 780 kHz VOUT = 3.3 V, fSW = 630 kHz VOUT = 2.5 V, fSW = 480 kHz VOUT = 1.8 V, fSW = 480 kHz VOUT = 1.2V, fSW = 480 kHz VOUT = 0.8V, fSW = 330 kHz 0 1 2 3 4 Output Current (A) 5 70 60 50 40 30 20 10 0 6 0 1 2 G000 Figure 1.
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LMZ31506 www.ti.com SNVS993 – JUNE 2013 100 95 90 85 80 75 70 65 60 55 50 45 40 VOUT = 3.3 V, fSW = 630 kHz VOUT = 2.5 V, fSW = 480 kHz VOUT = 1.8 V, fSW = 480 kHz VOUT = 1.2 V, fSW = 480 kHz VOUT = 0.8 V, fSW = 480 kHz VOUT = 0.6V, fSW = 250 kHz 0 1 2 3 4 Output Current (A) 5 50 40 30 20 10 0 6 VOUT = 3.3 V, fSW = 630 kHz VOUT = 2.5 V, fSW = 480 kHz VOUT = 1.8 V, fSW = 480 kHz VOUT = 1.2 V, fSW = 480 kHz VOUT = 0.8 V, fSW = 480 kHz VOUT = 0.6 V, fSW = 250 kHz 0 1 2 G000 Figure 6.
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LMZ31506 SNVS993 – JUNE 2013 www.ti.com 100 95 90 85 80 75 70 65 60 55 50 45 40 VOUT = 5.0 V, fSW = 780 kHz VOUT = 3.3 V, fSW = 630 kHz VOUT = 2.5 V, fSW = 480 kHz VOUT = 1.8 V, fSW = 480 kHz VOUT = 1.2 V, fSW = 480 kHz VOUT = 0.8 V, fSW = 480 kHz 80 VOUT = 5.0 V, fSW = 780 kHz VOUT = 3.3 V, fSW = 630 kHz VOUT = 2.5 V, fSW = 480 kHz VOUT = 1.8 V, fSW = 480 kHz VOUT = 1.2V, fSW = 480 kHz VOUT = 0.8V, fSW = 330 kHz 0 1 2 3 4 Output Current (A) 5 70 60 50 40 30 20 10 0 6 0 1 2 G000 Figure 11.
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LMZ31506 www.ti.com SNVS993 – JUNE 2013 APPLICATION INFORMATION ADJUSTING THE OUTPUT VOLTAGE The VADJ control sets the output voltage of the LMZ31506. The output voltage adjustment range is from 0.6V to 5.5V. The adjustment method requires the addition of RSET, which sets the output voltage, the connection of SENSE+ to VOUT, and in some cases RRT which sets the switching frequency. The RSET resistor must be connected directly between the VADJ (pin 43) and AGND (pin 45).
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LMZ31506 SNVS993 – JUNE 2013 www.ti.com CAPACITOR RECOMMENDATIONS FOR THE LMZ31506 POWER SUPPLY Capacitor Technologies Electrolytic, Polymer-Electrolytic Capacitors When using electrolytic capacitors, high-quality, computer-grade electrolytic capacitors are recommended. Polymer-electrolytic type capacitors are recommended for applications where the ambient operating temperature is less than 0°C.
PAGE 13
LMZ31506 www.ti.com SNVS993 – JUNE 2013 Table 4. Recommended Input/Output Capacitors (1) CAPACITOR CHARACTERISTICS VENDOR SERIES PART NUMBER WORKING VOLTAGE (V) CAPACITANCE (µF) ESR (2) (mΩ) Murata X5R GRM32ER61E226K 16 22 2 TDK X5R C3225X5R0J476K 6.3 47 2 Murata X5R GRM32ER60J476M 6.3 47 2 Sanyo POSCAP 16TQC68M 16 68 50 Kemet T520 T520V107M010ASE025 10 100 25 Sanyo POSCAP 6TPE100MI 6.3 100 25 Sanyo POSCAP 2R5TPE220M7 2.
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LMZ31506 SNVS993 – JUNE 2013 www.ti.com Transient Waveforms Figure 17. PVIN = 5V, VOUT = 0.6V, 2A Load Step Figure 18. PVIN = 5V, VOUT = 0.8V, 2A Load Step Figure 19. PVIN = 12V, VOUT = 1.2V, 2A Load Step Figure 20. PVIN = 5V, VOUT = 1.
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LMZ31506 www.ti.com SNVS993 – JUNE 2013 Figure 21. PVIN = 12V, VOUT = 1.8V, 2A Load Step Figure 22. PVIN = 5V, VOUT = 1.8V, 2A Load Step Application Schematics LMZ31506 VIN VIN / PVIN 4.5 V to 14.5 V PWRGD PVIN + CIN2 68 F CIN1 47 F VOUT 1.8 V SENSE+ INH/UVLO VOUT SS/TR + COUT1 4x 47 F COUT2 220 F RT/CLK RRT 200 k VADJ RSET 715 STSEL AGND PGND Figure 23. Typical Schematic PVIN = VIN = 4.5 V to 14.5 V, VOUT = 1.
PAGE 16
LMZ31506 SNVS993 – JUNE 2013 www.ti.com LMZ31506 VIN VIN / PVIN 4.5 V to 14.5 V PWRGD PVIN + CIN2 68 F CIN1 47 F VOUT 3.3 V SENSE+ INH/UVLO VOUT COUT1 + 2x 47 F SS/TR COUT2 100 F RT/CLK VADJ RRT 121 k RSET 316 STSEL AGND PGND Figure 24. Typical Schematic PVIN = VIN = 4.5 V to 14.5 V, VOUT = 3.3 V VIN 4.5 V to 14.5 V CIN3 4.7 F VIN LMZ31506 PVIN 3.3 V + PWRGD PVIN CIN2 68 F CIN1 47 F VOUT 1.2 V SENSE+ INH/UVLO VOUT SS/TR COUT1 + 4x 47 F COUT2 330 F RT/CLK RRT 200 k VADJ RSET 1.
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LMZ31506 www.ti.com SNVS993 – JUNE 2013 VIN and PVIN Input Voltage The LMZ31506 allows for a variety of applications by using the VIN and PVIN pins together or separately. The VIN voltage supplies the internal control circuits of the device. The PVIN voltage provides the input voltage to the power converter system. If tied together, the input voltage for the VIN pin and the PVIN pin can range from 4.5 V to 14.5 V. If using the VIN pin separately from the PVIN pin, the VIN pin must be between 4.5 V and 14.
PAGE 18
LMZ31506 SNVS993 – JUNE 2013 www.ti.com Parallel Operation Up to six LMZ31506 devices can be paralleled for increased output current. Multiple connections must be made between the paralleled devices and the component selection is slightly different than for a stand-alone LMZ31506 device. A typical LMZ31506 parallel schematic is shown in Figure 26. Refer to application note, SLVA574 for information and design help when paralleling multiple LMZ31506 devices.
PAGE 19
LMZ31506 www.ti.com SNVS993 – JUNE 2013 Power-Up Characteristics When configured as shown in the front page schematic, the LMZ31506 produces a regulated output voltage following the application of a valid input voltage. During the power-up, internal soft-start circuitry slows the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input source.
PAGE 20
LMZ31506 SNVS993 – JUNE 2013 www.ti.com Output On/Off Inhibit (INH) The INH pin provides electrical on/off control of the device. Once the INH pin voltage exceeds the threshold voltage, the device starts operation. If the INH pin voltage is pulled below the threshold voltage, the regulator stops switching and enters low quiescent current state. The INH pin has an internal pull-up current source, allowing the user to float the INH pin for enabling the device.
PAGE 21
LMZ31506 www.ti.com SNVS993 – JUNE 2013 Slow Start (SS/TR) Connecting the STSEL pin to AGND and leaving SS/TR pin open enables the internal SS capacitor with a slow start interval of approximately 1.1 ms. Adding additional capacitance between the SS pin and AGND increases the slow start time. Table 6 shows an additional SS capacitor connected to the SS/TR pin and the STSEL pin connected to AGND. See Table 6 below for SS capacitor values and timing interval. SS/TR CSS (Optional) AGND STSEL Figure 32.
PAGE 22
LMZ31506 SNVS993 – JUNE 2013 www.ti.com Synchronization (CLK) An internal phase locked loop (PLL) has been implemented to allow synchronization between 250 kHz and 780 kHz, and to easily switch from RT mode to CLK mode. To implement the synchronization feature, connect a square wave clock signal to the RT/CLK pin with a duty cycle between 20% to 80%. The clock signal amplitude must transition lower than 0.8 V and higher than 2.0 V.
PAGE 23
LMZ31506 www.ti.com SNVS993 – JUNE 2013 Sequencing (SS/TR) Many of the common power supply sequencing methods can be implemented using the SS/TR, INH and PWRGD pins. The sequential method is illustrated in Figure 36 using two LMZ31506 devices. The PWRGD pin of the first device is coupled to the INH pin of the second device which enables the second power supply once the primary supply reaches regulation. Figure 37 shows sequential turn-on waveforms of two LMZ31506 devices.
PAGE 24
LMZ31506 SNVS993 – JUNE 2013 www.ti.com Programmable Undervoltage Lockout (UVLO) The LMZ31506 implements internal UVLO circuitry on the VIN pin. The device is disabled when the VIN pin voltage falls below the internal VIN UVLO threshold. The internal VIN UVLO rising threshold is 4.5 V(max) with a typical hysteresis of 150 mV.
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LMZ31506 www.ti.com SNVS993 – JUNE 2013 Layout Considerations To achieve optimal electrical and thermal performance, an optimized PCB layout is required. Figure 43 and Figure 44 show two layers of a typical PCB layout. Some considerations for an optimized layout are: • Use large copper areas for power planes (PVIN, VOUT, and PGND) to minimize conduction loss and thermal stress. • Place ceramic input and output capacitors close to the device pins to minimize high frequency noise.
PAGE 26
LMZ31506 SNVS993 – JUNE 2013 www.ti.com EMI The LMZ31506 is compliant with EN55022 Class B radiated emissions. Figure 46 and Figure 45 show typical examples of radiated emissions plots for the LMZ31506 operating from 5V and 12V respectively. Both graphs include the plots of the antenna in the horizontal and vertical positions. Figure 45. Radiated Emissions 5-V Input, 1.8-V Output, 6-A Load (EN55022 Class B) 26 Figure 46. Radiated Emissions 12-V Input, 1.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Oct-2014 In no 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 by TI to Customer on an annual basis.
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IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.