TEXAS INSTRUMENTS PTN78020A Technical data

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1

6

2

3

7

V

I

C2*
4x 4.7 F
Ceramic
(Required)

m

C1*
100 F
Electrolytic
(Required)

m

C3*
100 F
(Required)

m

GND GND

V

O

PTN78020A

(Top View)

*See the for capacitor recommendation.Application Information

#R

SET

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

STANDARD APPLICATION

4 5

R

SET

#

1 %, 0.05 W

(Required)

L
O
A
D

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25-W, WIDE-INPUT ADJUSTABLE POSITIVE-TO-NEGATIVE VOLTAGE

FEATURES APPLICATIONS

• 4-A Output Current

• Wide-Input Voltage

(9 V to 29 V)

• Wide-Output Voltage Adjust

(–15 V to –3 V)

• High Efficiency (Up to 87%)

• Output Current Limit

• Overtemperature Shutdown

• Undervoltage Lockout

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

• Surface-Mount Package Available

PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 2005

REGULATOR MODULE

• General-Purpose, Industrial Controls,

HVAC Systems, Test and Measurement,
Medical Instrumentation, AC/DC Adaptors,
Vehicles, Marine, and Avionics

DESCRIPTION

The PTN78020A is a series of high-efficiency buck-boost-integrated switching regulators (ISR), that represent the
third generation in the evolution of high-performance power modules designed for industrial use. The wide-input
voltage range makes these modules suitable for a variety of applications that operate off 12–V, 24–V, and
tightly-regulated 28–V dc power. In new designs, they should be considered in place of the PT6640 and
PT78NR100 series of single in-line pin (SIP) products. The PTN78020A is smaller and lighter than its
predecessors, and has either similar or improved electrical performance characteristics. The caseless,
double-sided package has excellent thermal characteristics, and is compatible with TI's roadmap for RoHS and
lead-free compliance.

The PTN78020A operates over an input voltage range of 9 V to 29 V, and provides high-efficiency,
positive-to-negative voltage conversion for loads of up to 4 A. The output voltage is set using a single external
resistor, and may be adjusted to any value within the range, –15 V to –3 V.

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.

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.

Copyright © 2005, Texas Instruments Incorporated

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PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 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

PTN78020 (Basic Model)

Output Voltage Part Number Description Package Designator

PTN78020AAH Horizontal T/H (Pb-free) EUK-7

–15 V to –3 V PTN78020AAS

PTN78020AAZ

(1) Add a T suffix for tape and reel option on SMD packages.
(2) Standard option specifies Sn/Pb solder ball material.
(3) Lead (Pb) - free option specifies Sn/Ag solder ball material.

(1) (2)
(1) (3)

Horizontal SMD (standard) EUL-7

Horizontal SMD (Pb-free) EUL-7

ABSOLUTE MAXIMUM RATINGS

(1)

over operating free-air temperature range unless otherwise noted
all voltages with respect to GND

T

A

T

S

P

O

(1) Stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. These are stress ratings

Operating free-air temperature Over VIrange –40°C to 85°C

Solder reflow temperature

Surface temperature of module body or
pins

Horizontal SMD (suffix AS) 235°C

Horizontal SMD (suffix AZ) 260 ° C
Storage temperature –40°C to 125°C
Output power |V

| ≥ 12 V 25 W

O

only, and functional operation of the device at these or any other conditions beyond those indicated under recommended operating
conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

RECOMMENDED OPERATING CONDITIONS

MIN MAX UNIT

V

I

T

A

Input voltage 9 32 – |VO| V
Operating free-air temperature -40 85 °C

PACKAGE SPECIFICATIONS

PTN78020x (Suffix AH, AS, & AZ)

Weight 7.3 grams
Flammability Meets UL 94 V-O

Mechanical shock

Per Mil-STD-883D, Method 2002.3, 1 ms, ½ sine,
mounted

Mechanical vibration Mil-STD-883D, Method 2007.2, 20-2000 Hz

(1) Qualification limit.

Horizontal T/H (suffix AH) 250 Gs

Horizontal SMD (suffix AS and AZ) 125 Gs

Horizontal T/H (suffix AH) 20 Gs

Horizontal SMD (suffix AS and AZ) 10 Gs

UNIT

(1)

(1)
(1)
(1)

2

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PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 2005

ELECTRICAL CHARACTERISTICS

operating at 25°C free-air temperature, VI= 20 V, VO= –5 V, IO= IO(max), CI= 100 µF and 4x 4.7 µF, C
otherwise noted)

PARAMETER TEST CONDITIONS MIN TYP MAX UNIT

VO= -3 V 0.1 4

I

O

V

I

Output current A

Input voltage range Over IOrange V

TA= 25 ° C, natural convec­tion airflow

Set-point voltage tolerance TA= 25°C ±2%
Temperature variation -40°C to +85°C -0.5%

V

O

Line regulation Over VIrange -10 mV
Load regulation Over IOrange -10 mV

Total output voltage variation -3%

Includes set point, line, load

-40 < TA< 85°C

VO(adj) Output voltage adjust range 9 V ≤ VI≤ (32 – |VO|) V -15 - 3 V

η Efficiency

VI= 12 V, R

VI= 12 V, R

VI= 20 V, R

VI= 24 V, R

= 100 Ω, VO= –15 V 87%

SET

= 2 k Ω, VO= –12 V 86%

SET

= 28.7 k Ω, VO= –5 V 82%

SET

= 221 k Ω, VO= –3.3 V 77%

SET

Output voltage ripple 20-MHz bandwidth 1% V

I

O (LIM)

Current limit threshold ∆ VO= –50 mV 8.5 A

1 A/µs load step from 50% to 100%
IOmax

Transient response

VOover/undershoot 5 %V

F

S

Switching frequency Over VIand IOranges 440 550 660 kHz

UVLO Undervoltage lockout VIincreasing 5.5 V

C

I

External input capacitance µF

Ceramic 18.8
Nonceramic 100
Ceramic 200

C

O

External output capacitance Nonceramic 100

Equivalent series resistance (nonceramic) 10

MTBF Calculated reliability 5.6

Per Telcordia SR-332, 50% stress,
TA= 40°C, ground benign

VO= -5 V 0.1 4

VO= -12 V 0.1 2.1

VO= -15 V 0.1 1.67

VO= -3 V 9 29

VO= -5 V 9 27

VO= -12 V 9 20

VO= -15 V 9 17

Recovery time 200 µs

(4)
(4)

(5)
(6)

= 100 µF (unless

O

(1)
(1)
(1)
(1)
(2)
(2)
(2)
(2)
(3)

(3)

O

2,000

V

(PP)

O

µF

m Ω

6

10

Hrs

(1) The maximum output current is 4 A, or a maximum output power of 25 W, whichever is less.
(2) The maximum input voltage is limited and defined to be (32 – |VO|) volts.
(3) The set-point voltage tolerance is affected by the tolerance and stability of R

tolerance of 1% with 100 ppm/°C or better temperature stability.

(4) A minimum 100-µF electrolytic and four 4.7-µF ceramic capacitors are required across the input (V

Locate the ceramic capacitors close to the module.

. The stated limit is unconditionally met if R

SET

and GND) for proper operation.

I

SET

(5) 100 µF of output capacitance is required for proper operation. See the application information for further guidance.
(6) This is the typical ESR for all the electrolytic (nonceramic) capacitance. Use 17 m Ω as the minimum when using max-ESR values to

calculate.

has a

3

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PTN78020A

(Top View)

1

2

7

6

543

PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 2005

PIN ASSIGNMENT

TERMINAL FUNCTIONS

TERMINAL

NAME NO.

V

O

V

I

N/C 3 This pin is active and must be isolated from any electrical connection.

VOAdjust 4 I

N/C 5 This pin is active and must be isolated from any electrical connection.
GND 6 I/O The common ground connection for VIand VOpower connections.

1, 7 O

2 I The positive input voltage power node to the module, which is referenced to common GND.

I/O DESCRIPTION

The negative output voltage power connection. It is also the reference for the VOAdjust control input. For
proper operation, pins 1 and 7 must be connected.

A 1% resistor must be connected between pin 4 and pin 7 to set the output voltage of the module lower
than -3 V. If left open-circuit, the output voltage defaults to -3 V. The temperature stability of the resistor
should be 100 ppm/°C (or better). The set-point range is -15 V to -3 V. The standard resistor value for a
number of common output voltages is provided in the application information.

4

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0

1 2

3

4

50

40

55

45

65

60

70

75

80

85

95

90

100

V = -5 V

O

V = -3 V

O

V = -12 V

O

V = -15 V

O

Efficiency - %

I - Output Current - A

O

0

1 2

3

4

I - Output Current - A

O

0

50

100

150

250

200

300

V = -5 V

O

V = -3 V

O

V = -12 V

O

V = -15 V

O

V - Output Voltage Ripple - mV

O PP

0 1 2 3 4

I - Output Current - A

O

0

1

0.5

1.5

2

3

2.5

3.5

4

4.5

5

V = -5 V

O

V = -3 V

O

V = -12 V

O

V = -15 V

O

P - Power Dissipation - W

D

0 0.4 0.8 1.2 1.6

I - Output Current - A

O

20

30

50

40

60

70

80

90

V = -15 V

O

200 LFM

100 LFM

Nat conv

Ambient Temperature - C

o

0 0.3 0.6 0.9 1.51.2 1.8 2.1

I - Output Current - A

O

20

30

50

40

60

70

80

90

Ambient Temperature - C

o

200 LFM

100 LFM

Nat conv

V = -12 V

O

0

1 2

3

4

I - Output Current - A

O

20

30

50

40

60

70

80

90

V = -5 V

O

200 LFM

100 LFM

Nat conv

Ambient Temperature - C

o

SLTS244A – APRIL 2005 – REVISED MAY 2005

TYPICAL CHARACTERISTICS (9-V INPUT)

(1) (2)

EFFICIENCY OUTPUT VOLTAGE RIPPLE POWER DISSIPATION

vs vs vs

OUTPUT CURRENT OUTPUT CURRENT OUTPUT CURRENT

Figure 1. Figure 2. Figure 3.

PTN78020A

TEMPERATURE DERATING TEMPERATURE DERATING TEMPERATURE DERATING

vs vs vs

OUTPUT CURRENT OUTPUT CURRENT OUTPUT CURRENT

Figure 4. Figure 5. Figure 6.

(1) The electrical characteristic data has been developed from actual products tested at 25 ° C. This data is considered typical for the

converter. Applies to Figure 1 , Figure 2 , and Figure 3 .

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.
Applies to Figure 4 , Figure 5 , and Figure 6 .

5

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0 1 2 3 4

50

40

55

45

65

60

70

75

80

85

95

90

100

V = -5 V

O

V = -3 V

O

V = -12 V

O

V = -15 V

O

Efficiency - %

I - Output Current - A

O

0

1 2

3

4

I - Output Current - A

O

0

50

100

150

250

200

300

V = -5 V

O

V = -3 V

O

V = -12 V

O

V = -15 V

O

V - Output Voltage Ripple - mV

O PP

0 1 2 3 4

I - Output Current - A

O

0

1

0.5

1.5

2

3

2.5

3.5

4

4.5

5

V = -5 V

O

V = -3 V

O

V = -12 V

O

V = -15 V

O

P - Power Dissipation - W

D

0 0.3 0.6 0.9 1.51.2 1.8 2.1

I - Output Current - A

O

20

30

50

40

60

70

80

90

V = -12 V

O

200 LFM

100 LFM

Nat conv

Ambient Temperature - C

o

0 0.4 0.8 1.2 1.6

I - Output Current - A

O

20

30

50

40

60

70

80

90

V = -15 V

O

200 LFM

100 LFM

Nat conv

Ambient Temperature - C

o

0 1 2 3 4

I - Output Current - A

O

20

30

50

40

60

70

80

90

V = -5 V

O

200 LFM

100 LFM

Nat conv

Ambient Temperature - C

o

PTN78020A

SLTS244A – APRIL 2005 – REVISED MAY 2005

EFFICIENCY OUTPUT VOLTAGE RIPPLE POWER DISSIPATION

vs vs vs

OUTPUT CURRENT OUTPUT CURRENT OUTPUT CURRENT

Figure 7. Figure 8. Figure 9.

TYPICAL CHARACTERISTICS (12-V INPUT)

(1) (2)

TEMPERATURE DERATING TEMPERATURE DERATING TEMPERATURE DERATING

vs vs vs

OUTPUT CURRENT OUTPUT CURRENT OUTPUT CURRENT

Figure 10. Figure 11. Figure 12.

(1) The electrical characteristic data has been developed from actual products tested at 25 ° C. This data is considered typical for the

converter. Applies to Figure 7 , Figure 8 , and Figure 9 .

(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum

operating temperatures. Derating limits apply to modules soldered directly to a 100 mm x 100 mm, double-sided PCB with 2 oz. copper.
Applies to Figure 10 , Figure 11 , and Figure 12 .

6