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FEATURES APPLICATIONS

DESCRIPTION

INH

100 F

Electrolytic

(Required)

(1)

100 F

Electrolytic

(Required)

(1)

GND

-V

PTN04050A

(TopView)

STANDARD APPLICATION

SET

(2)

1%,0.05W

(Required)

PTN04050A

SLTS250 – SEPTEMBER 2005

6-W, 3.3-V/5-V INPUT, WIDE ADJUST OUTPUT, POSITIVE-TO-NEGATIVE CONVERTER

• General-Purpose, Industrial Controls,

• Up to 6-W Output Power

HVAC Systems, Test and Measurement,

• Wide-Input Voltage

Medical Instrumentation, AC/DC Adaptors,

(2.9 V to 7 V)

Vehicles, Marine, and Avionics

• Wide-Output Voltage Adjust

(–15 V to –3.3 V)

• High Efficiency (Up to 84%)

• On/Off Inhibit

• Output Current Limit

• Undervoltage Lockout

• Overtemperature Shutdown

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

• Surface-Mount Package Available

The PTN04050A is an adjustable output, positive-to-negative, integrated switching regulator. In new designs, it

should be considered in place of the PT5020 series of positive-to-negative integrated switching regulator

products. The PTN04050A is smaller and lighter than its predecessor, with improved electrical performance

characteristics, while operating over a wider input voltage range, with an adjustable output voltage. The

caseless, double-sided package also exhibits improved thermal characteristics, and is compatible with TI's

roadmap for RoHS and lead-free compliance.

Operating from a wide-input voltage range of 2.9 V to 7 V, the PTN04050A provides high-efficient,

positive-to-negative voltage conversion for loads of up to 6 W. The output voltage is set using a single external

resistor, and may be set to any value within the range, –15 V to –3.3 V.

The PTN04050A features include on/off inhibit, undervoltage lockout, over-current protection, and is suited for a

wide variety of general-purpose applications that operate off 3.3-V or 5-V input.

(1) See the Application Information for capacitor recommendations.

(2) R

SET

is required to adjust the output voltage. See the Application Information for values.

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 (19 pages)

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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 6-W, 3.3-V/5-V INPUT, WIDE ADJUST OUTPUT, POSITIVE-TO-NEGATIVE CONVERTER FEATURES APPLICATIONS • • • • • • • • • • • Up to 6-W Output Power Wide-Input Voltage (2.9 V to 7 V) Wide-Output Voltage Adjust (–15 V to –3.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. ORDERING INFORMATION For the most current package and ordering information, see the Package Option Addendum at the end of this datasheet, or see the TI website at www.ti.com.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 ELECTRICAL CHARACTERISTICS operating at 25°C free-air temperature, VI = 5 V, VO = –12 V, IO = IO (max), CI = 100 µF, CO = 100 µF (unless otherwise noted) PARAMETER IO Output current TEST CONDITIONS MIN TYP MAX VO = –3.3 V to –6 V 0.2 (1) 1.0 (2) VO = –9 V 0.1 (1) 0.6 (2) VO = –12 V 0.1 (1) 0.5 (2) VO = –12.6 V to –15 V 0.1 (1) TA = 85°C, natural convection airflow UNIT A 0.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 PIN ASSIGNMENT TERMINAL FUNCTIONS TERMINAL NAME NO. GND 1 VI 2 Inhibit 3 I/O DESCRIPTION The common ground connection for the VI and VO power connections. It is also the reference for the VO Adjust control inputs. I The positive input voltage power node to the module, which is referenced to common GND. I The Inhibit pin is an open-collector/drain (non-TTL), negative logic input that is referenced to GND.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 TYPICAL CHARACTERISTICS (3.3-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT VO = -9 V 80 75 VO = -12 V 70 VO = -3.3 V VO = -15 V 65 60 0 0.2 0.4 0.8 0.6 150 VO = -12 V 110 VO = -15 V 90 70 VO = -5 V 50 30 VO = -3.3 V 0 1 0.4 0.8 0.6 VO = -15 V 1.4 VO = -9 V 1.2 1 0.8 0.6 0.4 VO = -5 V 0.2 0 VO = -3.3 V 0 1 0.2 0.4 0.6 0.8 1 IO - Output Current - A IO - Output Current - A Figure 1.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 TYPICAL CHARACTERISTICS (5-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT VO - Output Voltage Ripple - mVPP VO = -9 V 85 80 75 VO = -3.3 V VO = -5 V 70 VO = -15 V 65 60 0 0.2 0.4 0.6 0.8 1 1.6 130 VO = -12 V 110 VO = -15 V 90 70 VO = -5 V 50 30 VO = -3.3 V 0 0.4 1.2 1 0.8 0.6 0.4 VO = -5 V 0.2 0 0.8 0.6 VO = -9 V VO = -15 V VO = -3.3 V 0 0.2 0.4 0.6 0.8 1 IO - Output Current - A 1 IO - Output Current - A Figure 8. Figure 9.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 APPLICATION INFORMATION Adjusting the Output Voltage of the PTN04050A Wide-Output Adjust Power Modules General A resistor must be connected directly between the VO Adjust control (pin 4) and GND (pin 1) to set the output voltage of the module. The adjustment range is from –15 V to –3.3 V. If pin 4 is left open, the output voltage defaults to –1.79 V, which is beyond the recommended operating range.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 Table 2. Output Voltage Set-Point Resistor Values 8 VO Required RSET VO Required RSET VO Required RSET –15.0 V 523 Ω –11.9 V 2.00 kΩ –8.8 V 4.75 kΩ –14.9 V 562 Ω –11.8 V 2.05 kΩ –8.6 V 5.11 kΩ –14.8 V 604 Ω –11.7 V 2.15 kΩ –8.4 V 5.36 kΩ –14.7 V 634 Ω –11.6 V 2.21 kΩ –8.2 V 5.62 kΩ –14.6 V 681 Ω –11.5 V 2.26 kΩ –8.0 V 5.90 kΩ –14.5 V 715 Ω –11.4 V 2.32 kΩ –7.8 V 6.34 kΩ –14.4 V 750 Ω –11.3 V 2.37 kΩ –7.6 V 6.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 CAPACITOR RECOMMENDATIONS FOR THE PTN04050A NEGATIVE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum requirement for the input bus is 100 µF of capacitance. The minimum ripple current rating for any nonceramic capacitance must be at least 250 mA rms. The ripple current rating of electrolytic capacitors is a major consideration when they are used at the input. This ripple current requirement can be reduced by placing ceramic capacitors at the input.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 Designing for Load Transients The transient response of the dc/dc converter has been characterized using a load transient with a di/dt of 1 A/µs. The typical voltage deviation for this load transient is given in the data sheet specification table using the required value of output capacitance. As the di/dt of a transient is increased, the response of a converter's regulation circuit ultimately depends on its output capacitor decoupling network.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 Power-Up Characteristics When configured per the standard application, the PTN04050A power module produces a regulated output voltage following the application of a valid input source voltage. During 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.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 Output On/Off Inhibit For applications requiring output voltage on/off control, the PTN04050A power module incorporates an output on/off Inhibit control (pin 3). The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be turned off. The power module functions normally when the Inhibit pin is left open-circuit, providing a regulated output whenever a valid source voltage is connected to VI with respect to GND.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 Optional Input/Output Filters Power modules include internal input and output ceramic capacitors in all their designs. However, some applications require much lower levels of either input reflected or output ripple/noise. This application describes various filters and design techniques found to be successful in reducing both input and output ripple/noise. Input/Output Capacitors The easiest way to reduce output ripple and noise is to add one or more 4.
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PTN04050A www.ti.com SLTS250 – SEPTEMBER 2005 L1 1 - 5 mH VI 2 PTN04050A GND INH 3 C1 4.7 mF Ceramic VO VI L2 1 - 5 mH 5 Adjust 1 4 (1) (1) C2 100 mF (Required) C3 100 mF (Required) RSET C4 4.7 mF Ceramic C5 (2) GND GND (1) See Table 3 for suggested value and type. (2) Recommended for application with load transients. Figure 20. Adding π Filters 45 40 Attenuation − dB 35 1 MHz 30 25 20 600 kHz 15 10 0 0.5 1 1.5 2 Load Current − A 2.5 3 Figure 21.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 26-Aug-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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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.