Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPTN78000AAH

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FEATURES APPLICATIONS

DESCRIPTION

C2*

2 x 4.7 F

Ceramic

(Required)

C1*

100 F

Electrolytic

(Required)

C3*

100 F

Electrolytic

(Required)

GND

PTN78000A

(Top View)

*See the for capacitor recommendation.Application Information

SET

is required to adjust the output voltage lower than -3 V. See the for values.Application Information

STANDARD APPLICATION

SET

1 %, 0.05 W

(Required)

PTN78000A

SLTS246B–APRIL 2005 – REVISED JANUARY 2006

1.5-A, WIDE-INPUT ADJUSTABLE BUCK-BOOST SWITCHING REGULATOR

• General-Purpose, Industrial Controls,

• 1.5-A Output Current

HVAC Systems, Test and Measurement,

• Wide-Input Voltage

Medical Instrumentation, AC/DC Adaptors,

(7 V to 29 V)

Vehicles, Marine, and Avionics

• Wide-Output Voltage Adjust

(–15 V to –3 V)

• High Efficiency (Up to 84%)

• Output Current Limit

• Overtemperature Shutdown

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

• Surface-Mount Package Available

The PTN78000A is a series of high-efficiency, buck-boost integrated switching regulators (ISR), that represent

the third generation in the evolution of the PT78NR100 series of products. In new designs, it should be

considered in place of t he PT78NR100 series of single in-line pin (SIP) products. The PTN78000A is smaller and

lighter than its predecessor, and has either similar or improved electrical performance characteristics. 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, the PTN78000A provides high-efficiency, positive-to-negative voltage

conversion for loads of up to 1.5 A. The output voltage is set using a single external resistor, and may be set to

any value within the range, –15 V to –3 V.

The PTN78000A has undervoltage lockout, and is suited to a wide variety of general-purpose applications that

operate off 12-V, 24-V, or tightly regulated 28-V dc power.

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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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 1.5-A, WIDE-INPUT ADJUSTABLE BUCK-BOOST SWITCHING REGULATOR FEATURES • • • • • • • • APPLICATIONS 1.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 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.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 ELECTRICAL CHARACTERISTICS operating at 25°C free-air temperature, VI = 12 V, VO = –5 V, IO = IO (max), C1 = 100 μF, C2 = 2x 4.7 μF, C3 = 100 μF (unless otherwise noted) PARAMETER IO Output current VI Input voltage range VO VO Adj TEST CONDITIONS TA = 85°C, natural convection airflow Over IO range IO (LIM) TYP 0.6 VO = –12 V 0.1 0.75 (1) VO = –5 V 0.1 1.5 (1) VO = –3.3 V 0.1 1.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 PIN ASSIGNMENT 1 2 5 PTN78000A (Top View) 4 3 TERMINAL FUNCTIONS TERMINAL NAME NO. I/O 1 O VI 2 I N/C 3 VO Adjust 4 I GND 5 I/O VO 4 DESCRIPTION The negative output voltage power node with respect to the GND node. It is also the reference for the VO Adjust control inputs. The positive input voltage power node to the module, which is referenced to common GND.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (7-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT 75 VO = -12 V 70 65 VO = -15 V 60 VO = -5 V VO = -3 V 55 50 45 0 0.3 0.6 0.9 1.2 VO = -12 V 120 VO = -15 V 100 80 60 40 VO = -5 V 20 VO = -3 V 0 0 1.5 1 VO = -5 V 0.5 VO = -3 V 0 1.2 0 1.5 0.3 0.6 0.9 1.2 1.5 Figure 2. Figure 3.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (12-V INPUT) (1) (2) OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT 75 70 VO = -12 V 65 VO = -15 V 60 VO = -5 V 55 VO = -3 V 50 45 0 0.5 1 1.5 100 2 VO = -15 V 90 80 70 VO = -12 V 60 50 40 VO = -5 V 30 20 VO = -3 V 10 0 0 IO - Output Current - A VO = -5 V 0.6 0.4 VO = -3 V 0.2 0 0 0.5 1 1.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 TYPICAL CHARACTERISTICS (24-V INPUT) (1) (2) EFFICIENCY vs OUTPUT CURRENT OUTPUT VOLTAGE RIPPLE vs OUTPUT CURRENT 80 VO = -5 V Efficiency - % 75 70 65 VO = -3 V 60 55 50 45 0 0.3 0.6 0.9 1.2 70 2 1.8 60 VO = -5 V 50 PD - Power Dissipation - W VO - Output Voltage Ripple - mVPP 85 POWER DISSIPATION vs OUTPUT CURRENT 40 30 20 VO = -3 V 10 0 VO = -5 V 1.2 1 0.8 VO = -3 V 0.6 0.4 0.2 0 0 1.5 1.6 1.4 0.3 0.9 0.6 1.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 APPLICATION INFORMATION Adjusting the Output Voltage of the PTN78000A Wide-Output Adjust Power Modules General A resistor must be connected directly between the VO Adjust control (pin 4) and the output voltage (pin 7) to set the output voltage lower than –3 V. The adjustment range is from –15 V to –3 V. If pin 4 is left open, the output voltage defaults to the highest value, –3 V.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 Table 2. Output Voltage Set-Point Resistor Values VO Required RSET VO Required RSET VO Required RSET –15.0 V 99 Ω –11.9 V 2.09 kΩ –8.8 V 6.21 kΩ –14.9 V 147 Ω –11.8 V 2.18 kΩ –8.6 V 6.63 kΩ –14.8 V 196 Ω –11.7 V 2.27 kΩ –8.4 V 7.09 kΩ –14.7 V 245 Ω –11.6 V 2.36 kΩ –8.2 V 7.58 kΩ –14.6 V 296 Ω –11.5 V 2.45 kΩ –8.0 V 8.11 kΩ –14.5 V 347 Ω –11.4 V 2.55 kΩ –7.8 V 8.68 kΩ –14.4 V 400 Ω –11.3 V 2.
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PTN78000A SLTS246B – APRIL 2005 – REVISED JANUARY 2006 www.ti.com CAPACITOR RECOMMENDATIONS FOR THE PTN78000 WIDE-OUTPUT ADJUST POWER MODULES Input Capacitor The minimum requirements for the input bus is 100 μF of nonceramic capacitance and 9.4 μF (2 x 4.7 μF) of ceramic capacitance, in either an X5R or X7R temperature characteristic, and 100 μF of electrolytic capacitance. Ceramic capacitors should be located within 0.5 inch (1,27 cm) of the regulator's input pins.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 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.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 Power-Up Characteristics When configured per the standard application, the PTN78000A 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.
PAGE 13
PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 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.
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PTN78000A www.ti.com SLTS246B – APRIL 2005 – REVISED JANUARY 2006 L1 1 - 5 mH VI 2 VI PTN78000A GND C2 100 mF Electrolytic (Required) 1 4 C3 2 x 4.7 mF Ceramic (Required) (See Note A) C4 100 mF (Required) (See Note B) RSET GND C5 4.7 mF Ceramic C6 (See Note C) GND A. See specifications for required value and type. B. See Application Information for suggested value and type. C. Recommended for applications with load transients. Figure 20.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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IMPORTANT NOTICE 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.