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100

0 0.5 1 1.5 2 2.5

Output Current (A)

Efficiency (%)

= 24 V, V

OUT

= 15 V, f

= 1 MHz

= 24 V, V

OUT

= 12 V, f

= 800 kHz

G000

VOUTVIN

LMZ35003

VADJ

AGND PGND

OUT

PWRGD

RT/CLK

INH/UVLO

SS/TR

STSEL

SET

OUT

LMZ35003

www.ti.com

SNVS988 –JULY 2013

2.5A SIMPLE SWITCHER® Power Module with 7V-50V Input in QFN Package

Check for Samples: LMZ35003

FEATURES

DESCRIPTION

• Complete Integrated Power Solution Allows

The LMZ35003 SIMPLE SWITCHER® power module

Small Footprint, Low-Profile Design

is an easy-to-use integrated power solution that

• Wide Input Voltage Range from 7 V to 50 V

combines a 2.5-A DC/DC converter with a shielded

• Output Adjustable from 2.5 V to 15 V

inductor and passives into a low profile, QFN

package. This total power solution allows as few as

• 65-V Surge Capability

five external components and eliminates the loop

• Efficiencies Up To 96%

compensation and magnetics part selection process.

• Adjustable Switching Frequency

The small 9 mm × 11 mm × 2.8 mm, QFN package is

(300 kHz to 1 MHz)

easy to solder onto a printed circuit board and allows

• Synchronizes to an External Clock

a compact point-of-load design with greater than 90%

• Adjustable Slow-Start

efficiency and excellent power dissipation capability.

The LMZ35003 offers the flexibility and the feature-

• Output Voltage Sequencing and Tracking

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

• Power Good Output

powering a wide range of ICs and systems.

• Programmable Undervoltage Lockout (UVLO)

Advanced packaging technology affords a robust and

reliable power solution compatible with standard QFN

• Output Overcurrent Protection

mounting and testing techniques.

• Over Temperature Protection

• Pre-bias Output Start-up

SIMPLIFIED APPLICATION

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

• Enhanced Thermal Performance: 14°C/W

• Meets EN55022 Class B Emissions

- Integrated Shielded Inductor

• For Design Help visit

http://www.ti.com/LMZ35003

APPLICATIONS

• Industrial and Motor Controls

• Automated Test Equipment

• Medical and Imaging Equipment

• High Density Power Systems

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.

Summary of content (30 pages)

PAGE 1
LMZ35003 www.ti.com SNVS988 – JULY 2013 2.5A SIMPLE SWITCHER® Power Module with 7V-50V Input in QFN Package Check for Samples: LMZ35003 FEATURES 1 • • • • • • • • • • • • • • • • • • Complete Integrated Power Solution Allows Small Footprint, Low-Profile Design Wide Input Voltage Range from 7 V to 50 V Output Adjustable from 2.
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LMZ35003 SNVS988 – JULY 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.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 ELECTRICAL CHARACTERISTICS -40°C ≤ TA ≤ +85°C, VIN = 24 V, VOUT = 5.0 V, IOUT = 2.5 A, RT = Open CIN = 2 x 2.
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LMZ35003 SNVS988 – JULY 2013 www.ti.com THERMAL INFORMATION LMZ35003 THERMAL METRIC (1) RKG UNIT 41 PINS Junction-to-ambient thermal resistance (2) θJA 14 (3) ψJT Junction-to-top characterization parameter ψJB Junction-to-board characterization parameter (4) (1) (2) (3) (4) 3.3 °C/W 6.8 For more information about traditional and new thermal metrics, see the IC Package Thermal Metrics application report, SPRA953.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 PIN DESCRIPTIONS TERMINAL NAME DESCRIPTION NO. 1 4 5 AGND 30 32 33 These pins are connected to the internal analog ground (AGND) of the device. This node should be treated as the zero volt ground reference for the analog control circuitry. Pad 37 should be connected to PCB ground planes using multiple vias for good thermal performance. Not all pins are connected together internally.
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LMZ35003 SNVS988 – JULY 2013 www.ti.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 TYPICAL CHARACTERISTICS (VIN = 12 V) 100 (1) (2) 40 VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz VOUT = 2.5 V, fSW = 400 kHz Output Voltage Ripple (mV) 95 90 80 75 70 65 VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz VOUT = 2.5 V, fSW = 400 kHz 60 55 50 0 0.5 1 1.5 Output Current (A) 2 30 20 10 0 2.5 0 0.5 Figure 1. Efficiency vs. Output Current Ambient Temperature (°C) Power Dissipation (W) 1.
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LMZ35003 SNVS988 – JULY 2013 www.ti.com TYPICAL CHARACTERISTICS (VIN = 24 V) (1) (2) (3) 60 100 VOUT = 15 V, fSW = 1 MHz VOUT = 12 V, fSW = 800 kHz VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz VOUT = 2.5 V, fSW = 400 kHz 95 80 75 70 VOUT = 15 V, fSW = 1 MHz VOUT = 12 V, fSW = 800 kHz VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz VOUT = 2.5 V, fSW = 400 kHz 60 55 50 0 0.5 1 1.5 Output Current (A) 2 40 30 20 10 0 2.5 0 Figure 7. Efficiency vs. Output Current 1 1.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 TYPICAL CHARACTERISTICS (VIN = 36 V) (1) (2) (3) 60 100 VOUT = 15 V, fSW = 1 MHz VOUT = 12 V, fSW = 800 kHz VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz VOUT = 2.5 V, fSW = 400 kHz 95 80 75 70 VOUT = 15 V, fSW = 1 MHz VOUT = 12 V, fSW = 800 kHz VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz VOUT = 2.5 V, fSW = 400 kHz 60 55 50 0 0.5 1 1.5 Output Current (A) 2 40 30 20 10 0 2.5 0 Figure 13. Efficiency vs. Output Current 1 1.
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LMZ35003 SNVS988 – JULY 2013 www.ti.com TYPICAL CHARACTERISTICS (VIN = 48 V) 70 100 95 80 75 70 65 VOUT = 15 V, fSW = 1 MHz VOUT = 12 V, fSW = 800 kHz VOUT = 5.0 V, fSW = 500 kHz VOUT = 3.3 V, fSW = 400 kHz 60 55 50 0 0.5 1 1.5 Output Current (A) 2 50 40 30 20 10 0 2.5 0 0.5 G000 Figure 19. Efficiency vs. Output Current 1 1.5 Output Current (A) 2 G000 Figure 20. Voltage Ripple vs. Output Current 6 90 VOUT = 15 V, fSW = 1 MHz VOUT = 12 V, fSW = 800 kHz VOUT = 5.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 CAPACITOR RECOMMENDATIONS FOR THE LMZ35003 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.
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LMZ35003 SNVS988 – JULY 2013 www.ti.com APPLICATION INFORMATION LMZ35003 OPERATION The LMZ35003 can operate over a wide input voltage range of 7V to 50V and produce output voltages from 2.5V to 15V. The performance of the device varies over this wide operating range, and there are some important considerations when operated near the boundary limits. This section offers guidance in selecting the optimum components depending on the application and operating conditions.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 ADJUSTING THE OUTPUT VOLTAGE The LMZ35003 is designed to provide output voltages from 2.5V to 15V. The output voltage is determined by the value of RSET, which must be connected between the VOUT node and the VADJ pin (Pin 36). For output voltages greater than 5.0V, improved operating performance can be obtained by increasing the operating frequency. This adjustment requires the addition of RRT between RT/CLK (Pin 31) and AGND (Pin 30).
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LMZ35003 SNVS988 – JULY 2013 www.ti.com Undervoltage Lockout (UVLO) Threshold At turn-on, the VON UVLO threshold determines the input voltage level where the device begins power conversion. During the power-down sequence, the VOFF UVLO threshold determines the input voltage where power conversion ceases. The turn-on and turn-off thresholds are set by two resistors, RUVLO1 and RUVLO2 as shown in Figure 26.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 Switching Frequency Nominal switching frequency of the LMZ35003 is set from the factory at 400 kHz. This switching frequency is optimum for output voltages below 5.0 V. For output voltages 5.0V and above, better operating performance can be obtained raising the operating frequency. This is easily done by adding a resistor, RRT in , from the RT/CLK pin (Pin 31) to the AGND pin (Pin 30).
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LMZ35003 SNVS988 – JULY 2013 www.ti.com Application Schematics VIN 7-36 V LMZ35003 VIN 4.7 F 50 V PWRGD 174kΩ VOUT 3.3V @ 2.5A VOUT INH/UVLO 47 F 6.3 V 31.6kΩ 40.2kΩ 47 F 6.3 V VADJ RT/CLK SS/TR STSEL AGND PGND Figure 28. Typical Schematic VIN = 7 V to 36 V, VOUT = 3.3 V VIN 15-50 V LMZ35003 VIN 2.2 F 100 V 2.2 F 100 V PWRGD VOUT 12 V @ 2.5 A VOUT 174kΩ INH/UVLO 47 F 16 V 140kΩ 15.4kΩ 47 F 16 V VADJ RT/CLK SS/TR 22 nF 267kΩ STSEL AGND PGND Figure 29.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 VIN 8-50 V LMZ35003 VIN 2.2 F 100 V 2.2 F 100 V 174kΩ PWRGD VOUT 5 V @ 2.5 A VOUT INH/UVLO 52.3kΩ 31.6kΩ 47 F 6.3 V 47 F 6.3 V VADJ RT/CLK SS/TR 1100kΩ STSEL AGND PGND Figure 30. Typical Schematic VIN = 8 V to 50 V, VOUT = 5 V Power-Up Characteristics When configured as shown in the front page schematic, the LMZ35003 produces a regulated output voltage following the application of a valid input voltage.
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LMZ35003 SNVS988 – JULY 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.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 Slow Start (SS/TR) For outputs voltages of 5V or less, the slow start capacitance built into the LMZ35003 is sufficient to provide for a turn-on ramp rate that does not induce large surge currents while charging the output capacitors. Connecting the STSEL pin (Pin 29) to AGND while leaving SS pin (Pin 28) open enables the internal SS capacitor with a slow start interval of approximately 5 ms.
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LMZ35003 SNVS988 – JULY 2013 www.ti.com Overcurrent Protection For protection against load faults, the LMZ35003 incorporates cycle-by-cycle current limiting. During an overcurrent condition the output current is limited and the output voltage is reduced, as shown in Figure 36. As the output voltage drops more than 8% below the set point, the PWRGD signal is pulled low. If the output voltage drops more than 25%, the switching frequency is reduced to reduce power dissipation within the device.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 Light-Load Behavior The LMZ35003 is a non-synchronous converter. One of the characteristics of a non-synchronous converter is that as the load current on the output is decreased, a point is reached where the energy delivered by a single switching pulse is more than the load can absorb. This causes the output voltage to rise slightly.
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LMZ35003 SNVS988 – JULY 2013 www.ti.com Thermal Shutdown The internal thermal shutdown circuitry forces the device to stop switching if the junction temperature exceeds 180°C typically. The device reinitiates the power up sequence when the junction temperature drops below 165°C typically. Layout Considerations To achieve optimal electrical and thermal performance, an optimized PCB layout is required. Figure 40 and Figure 41 show two layers of a typical PCB layout.
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LMZ35003 www.ti.com SNVS988 – JULY 2013 EMI The LMZ35003 is compliant with EN55022 Class B radiated emissions. Figure 42 and Figure 43 show typical examples of radiated emissions plots for the LMZ35003 operating from 24 V and 12 V respectively. Both graphs include the plots of the antenna in the horizontal and vertical positions. Figure 42. Radiated Emissions 24-V Input, 5-V Output, 2-A Load (EN55022 Class B) Figure 43.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 20-Feb-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.