TEXAS INSTRUMENTS SLTS154 Technical data

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PT6980 Series

10-A 12V-Input Dual Output
Integrated Switching Regulator

Description

The PT6980 Excalibur™ series of
power modules are dual output integrated
switching regulators (ISRs) specifically
designed to power mixed signal ICs.
Operating from a 12-V input bus, the dual
output provides power for both the digital
I/O logic and a DSP core from a single
module. Both output voltages are internally
sequenced during power-up and power­down to comply with the requirements of
the latest DSP chips. Each output is inde­pendently adjustable or can be set to at
least one alternative bus voltage with a
simple pin-strap. The modules are made
available in a space-saving solderable case.
The features include output current limit
and short-circuit protection.

Features

• Dual Outputs

(See Ordering Information)

• Ideal Power Source for DSPs

• 12V Input

• Outputs Adjustable

• Remote Sensing (Vo

& Vo2)

1

• Standby Function

Ordering Information

PT6981o = +2.5/1.8 Volts
PT6982o = +3.3/2.5 Volts
PT6983o = +3.3/1.8 Volts
PT6984o = +3.3/1.2 Volts
PT6985o = +2.5/1.2 Volts

PT Series Suffix

Case/Pin Order Package
Configuration Suffix Code

Vertical N (ELF)
Horizontal A (ELG)
SMD C (ELH)

(Reference the applicable package code drawing
for the dimensions and PC layout)

(PT1234x )

SLTS154

Revised (10/2/2001)

• Soft-Start

• Internal Sequencing

• Short Circuit Protection

• 23-pin Space-Saving Package

• Solderable Copper Case

Pin-Out Information

Pin Function

1Vo1 Sense

2 No Connect

3 STBY

4V

in

5V

in

6V

in

7GND

8GND

9GND

10 GND

11 GND

12 Vo

1

* Vo

and Vo2 can be pin-strapped to another voltage.

1

See application note on output voltage adjustment.

Pin Function

13 Vo

1

14 Vo

1

15 Vo

1

16 Vo1 Adjust *

17 No Connect

18 Vo

2

19 Vo

2

20 Vo

2

21 Vo

2

22 Vo2 Sense

23 Vo2 Adjust *

Standard Application

For technical support and more information, see inside back cover or visit www.ti.com

STBY

V

IN

GND

Vo2 Sense

Vo1 Sense

22

3

4,5,6

C

1

PT6980

7-11

1

18-21

12-15

16

23

+

C

2

+

C

3

GND

Vo

Vo

2

1

C1 = Req’d 560µF electrolytic
C2 = Req’d 330µF electrolytic

C3 = Optional 100µF electrolytic

PT6980 Series

10-A 12V-Input Dual Output
Integrated Switching Regulator

General Specifications (Unless otherwise stated, T

Characteristic Symbol Conditions Min Typ Max Units

Short Circuit Current I
Switching Frequency ƒ
Standby (Pin 3) Referenced to GND (pin 7)

Input High Voltage V
Input Low Voltage V
Input Low Current I

Standby Input Current Iin standby pin 3 to GND — 4 6 mA
External Output Capacitance C

Maximum Operating T
Temperature Range

Storage Temperature T
Mechanical Shock Per Mil-STD-883D, Method 2002.3

Mechanical Vibration Per Mil-STD-883D, Method 2007.2

Weight — Vertical/Horizontal — 2 6 — grams
Flammability — Meets UL 94V-O

Notes: (1) The Standby (pin 3) has an internal pull-up to Vin, and if it is left open circuit the module will operate when input power is applied.Refer to the application

Input/Output Capacitors: The PT6980 series requires a 330µF electrolytic capacitor at both the input and output for proper operation (300µF for Oscon® or low ESR
tantalum). In addition, the input capacitance must be rated for a minimum of 1.0Arms ripple current. For transient or dynamic load applications, additional capacitance
may be required. Refer to the application notes for more information.

notes for interface considerations.
(2) The total combined ESR of all output capacitance at 100kHz must be (less than) <50 mΩ.
(3) For operating temperatures below 0°C, Cin and Cout must have stable characteristics. Use either tantalum or Oscon® capacitors.
(4) See Safe Operating Area curves for the specific output voltage combination, or contact the factory for the appropriate derating.

sc

o

IH
IL

IL

2

C

3

a

s

=25°C, Vin =12V)

a

PT6980 Series

Io1 + I o2 combined — 19 — A
Over Vin range 500 550 600 kHz

— — Open
–0.1 — +0.4
— -0.5 – mA

(2)

330
0 — 330

Over Vin Range –40

— –40 — +125 °C

1 msec, ½ Sine, mounted — 500 — G ’s

20-2000 Hz, Soldered in a PC board — 15 — G ’s

— 15,000

(3)

— +85

(1)

V

(2)

µF

(4)

°C

Power-up Sequencing and Vo1/Vo2 Loading

Power-up Sequencing

The PT6980 series of regulators provide two output voltages,

and Vo2. Each of the output voltage combinations

Vo

1

offered by the PT6980 series provides power for both a low­voltage processor core, and the associated digital support
circuitry. In addition, each output is internally sequenced
during power-up and power-down to comply with the
requirements of most DSP and µP IC’s, and their accompa­nying chipsets. Figure 1 shows the typical waveforms of the
output voltages, Vo1 and Vo2, from the instance that either
input power is applied or the module is enabled via the
Standby pin. Following a delay of about 25 milli-secs, the
voltages at Vo1 and Vo2 rise together until Vo2 reaches its
set-point. Then Vo1 continues to rise until both output
voltages have reached full voltage.

Figure 1; PT6980 Series Power-up

V1 (1V/Div)

Vo

/Vo2 Loading

1

The output voltages from the PT6980 series regulators are
independently regulated. The voltage at Vo

is produced

1

by a highly efficient switching regulator. The lower output
voltage, Vo2, is derived from Vo1. The regulation method
used for Vo2 also provides control of this output voltage
during power-down. Vo2 will sink current if the voltage at
Vo1 attempts to fall below it.

The load specifications for each model of the PT6980
series gives both a ‘Typical’ (Typ) and ‘Maximum’ (Max)
load current for each output. For operation within the
product’s rating, the load currents at Vo

and Vo2 must

1

comply with the following limits:-

•Io2 must be less than Io2(max).

• The sum-total current from both outputs (Io

+ Io2)

1

must not exceed Io1(max).

In the case that either Vo

or Vo2 are adjusted to some

1

other value than the default output voltage, the absolute
maximum load current for Io2 must be revised to comply
with the following equation.

HORIZ SCALE: 5ms/Div

V2 (1V/Div)

Vstby (10V/Div)

Io2 (max) =

Consult the specification table for each model of the series

Vo

2.5
– Vo

1

Adc

2

for the actual numeric values.

For technical support and more information, see inside back cover or visit www.ti.com

PT6981

)

(A)

)

(A)

(typ) ]

(typ) ]

10.5-A 12V-Input Dual Output
Integrated Switching Regulator

PT6981 Performance Specifications (Unless otherwise stated, T

=25°C, Vin =12V, C1 =560µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)

a

PT6981 (2.5V/1.8V)

Characteristic Symbol Conditions Min Typ Max Units

Output Current Io

Io
Io

Io
Input Voltage Range V
Set Point Voltage Tolerance V

Temperature Variation Reg

Line Regulation Reg

Load Regulation Reg
Total Output Voltage Variation ∆V

1
2

1
2

in

tol Vo

o

temp

line

load

tot Includes set-point, line, load Vo

o

Ta =25°C, natural convection Vo1 (2.5V) 0.1

Ta =60°C, 200LFM airflow Vo1 (2.5V) 0.1

Vo2 (1.8V) 0 2.5

Vo2 (1.8V) 0 2.5

Over Io Range 10.8 — 13.2 VDC

–40° >Ta > +85°C Vo

Over Vin range Vo

Over Io range Vo

–40° >Ta > +85°C Vo

(i)

(i)

— ±12 ±38

1

Vo

— ± 9 ±27

2

— ±0.5 —

1

Vo

— ±0.5 —

2

— ±10 ±15 mV

1

Vo

—±5±7

2

— ±10 ±15

1

Vo

—±5±7

2

— ±44 —

1

— ±28 —

2

(ii)

8

(ii)

(ii)

8

(ii)

10.5

2.5

10.5

2.5

(iii)

A

(iii)

(iii)

A

(iii)

mV

%V

o

mV

mV

Efficiency η —80—%
Vo Ripple (pk-pk) V

Transient Response t

∆V

r

tr

tr

20MHz bandwidth Vo

—35—

1

Vo

—35—

2

1A/µs load step, 50% to 100% Iotyp — 6 0 — µs
Vo over/undershoot Vo

— ±50 —

1

Vo

— ±20 —

2

mV

mV

pp

Notes: (i) Io1(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.

(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io

and Io2 must be less than Io1max, and Io2 must be less than Io2max.

1

PT6981 Typical Characteristics

Efficiency vs Io1 (See Note A)

90

85

80

75

70

65

Efficiency - %

60

55

50

012345678

Vo1 Output Ripple vs Io1 (See Note A)

70

60

50

40

30

Ripple - mV

20

10

0

012345678

Io1 (A

Io1 (A) [ Io2 fixed at Io

2

Io

Power Dissipation vs Io1 (See Note A)

7

6

2

0.5
1

1.5
2

2.5

5

4

3

Pd - Watts

2

1

0

012345678

Safe Operating Area, Vin =12V (See Note B)

90

80

70

60

50

40

Ambient Temperature (°C)

30

20

012345678

Io1 (A) [ Io2 fixed at Io

Io1 (A

2

Airflow

200LFM
120LFM
60LFM
Nat conv

Io

2

2.5
2

1.5
1

0.5

0.1

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

PT6982

)

(A)

)

(A)

(typ) ]

(typ) ]

10.5-A 12V-Input Dual Output
Integrated Switching Regulator

PT6982 Performance Specifications (Unless otherwise stated, T

=25°C, Vin =12V, C1 =560µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)

a

PT6982 (3.3V/2.5V)

Characteristic Symbol Conditions Min Typ Max Units

Output Current Io

Io

Io

Io
Input Voltage Range V
Set Point Voltage Tolerance V

Temperature Variation Reg

Line Regulation Reg

Load Regulation Reg

Total Output Voltage Variation ∆V

1
2

1
2

in

tol Vo

o

temp

line

load

tot Includes set-point, line, load Vo

o

Ta =25°C, natural convection Vo1 (3.3V) 0.1

Ta =60°C, 200LFM airflow Vo1 (3.3V) 0.1

Vo2 (2.5V) 0 2

Vo2 (2.5V) 0 2

Over Io Range 10.8 — 13.2 VDC

–40° >Ta > +85°C Vo

Over Vin range Vo

Over Io range Vo

–40° >Ta > +85°C Vo

(i)

(i)

— ±16 ±50

1

Vo

— ±12 ±38

2

— ±1.0 —

1

Vo

— ±0.5 —

2

— ±10 ±15

1

Vo

—±5±7

2

— ±10 ±15

1

Vo

— ±10 ±13

2

— ±69 —

1

— ±39 —

2

(ii)

8.5

(ii)

(ii)

8.5

(ii)

10.5

2.25

10.5

2.25

(iii)

A

(iii)

(iii)

A

(iii)

mV

%V

o

mV

mV

mV

Efficiency η —84—%

Ripple (pk-pk) V

V

o

Transient Response t

Notes: (i) Io

(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.

1

(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io

and Io2 must be less than Io1max, and Io2 must be less than Io2max.

1

∆V

r

tr

tr

20MHz bandwidth Vo

—35—

1

Vo

—35—

2

1A/µs load step, 50% to 100% Iotyp — 6 0 — µs
Vo over/undershoot Vo

— ±50 —

1

Vo

— ±30 —

2

mV

mV

pp

PT6982 Typical Characteristics

Efficiency vs Io1 (See Note A)

90

85

80

75

70

65

Efficiency - %

60

55

50

012345678

Vo1 Output Ripple vs Io1 (See Note A)

70

60

50

40

30

Ripple - mV

20

10

0

012345678

Io1 (A

Io1 (A) [ Io2 fixed at Io

2

Power Dissipation vs Io1 (See Note A)

7

6

Io

2

1

1.5
2

5

4

3

Pd - Watts

2

1

0

012345678

Safe Operating Area, Vin =12V (See Note B)

90

80

70

60

50

40

Ambient Temperature (°C)

30

20

012345678

Io1 (A) [ Io2 fixed at Io

Io1 (A

2

Io

Airflow

200LFM
120LFM
60LFM
Nat conv

2

2

1.5
1

0.1

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

PT6983

)

(A)

)

(A)

(typ) ]

(typ) ]

9.5-A 12V-Input Dual Output
Integrated Switching Regulator

PT6983 Performance Specifications (Unless otherwise stated, T

=25°C, Vin =12V, C1 =560µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)

a

PT6983 (3.3V/1.8V)

Characteristic Symbol Conditions Min Typ Max Units

Output Current Io

Io

Io

Io
Input Voltage Range V
Set Point Voltage Tolerance V

Temperature Variation Reg

Line Regulation Reg

Load Regulation Reg

Total Output Voltage Variation ∆V

1
2

1
2

in

tol Vo

o

temp

line

load

tot Includes set-point, line, load Vo

o

Ta =25°C, natural convection Vo1 (3.3V) 0.1

Ta =60°C, 200LFM airflow Vo1 (3.3V) 0.1

Vo2 (1.8V) 0 2

Vo2 (1.8V) 0 2

Over Io Range 10.8 — 13.2 VDC

–40° >Ta > +85°C Vo

Over Vin range Vo

Over Io range Vo

–40° >Ta > +85°C Vo

(i)

(i)

— ±16 ±50

1

Vo

— ± 9 ±27

2

— ±1.0 —

1

Vo

— ±0.5 —

2

— ±10 ±15 mV

1

Vo

—±5±7

2

— ±10 ±15

1

Vo

—±5±7

2

— ±69 —

1

— ±28 —

2

(ii)

7.5

(ii)

(ii)

7.5

(ii)

(iii)

9.5
2

9.5
2

A

(iii)

(iii)

A

(iii)

mV

%V

o

mV

mV

Efficiency η —81—%

Ripple (pk-pk) V

V

o

Transient Response t

Notes: (i) Io

(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.

1

(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io

and Io2 must be less than Io1max, and Io2 must be less than Io2max.

1

∆V

r

tr

tr

20MHz bandwidth Vo

—35—

1

Vo

—35—

2

1A/µs load step, 50% to 100% Iotyp — 6 0 — µs
Vo over/undershoot Vo

— ±50 —

1

Vo

— ±20 —

2

mV

mV

pp

PT6983 Typical Characteristics

Efficiency vs Io1 (See Note A)

90

85

80

75

70

65

Efficiency - %

60

55

50

01234567

Vo1 Output Ripple vs Io1 (See Note A)

70

60

50

40

30

Ripple - mV

20

10

0

01234567

Io1 (A

Io1 (A) [ Io2 fixed at Io

2

Power Dissipation vs Io1 (See Note A)

8

7

Io

2

1

1.5
2

6

5

4

Pd - Watts

3

2

1

0

01234567

Safe Operating Area, Vin =12V (See Note B)

90

80

70

60

50

40

Ambient Temperature (°C)

30

20

01234567

Io1 (A) [ Io2 fixed at Io

Io1 (A

2

Io

Airflow

200LFM
120LFM
60LFM
Nat conv

2

2

1.5
1

0.1

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

PT6984

)

(A)

(typ) ]

)

(A)

(typ) ]

8.6-A 12V-Input Dual Output
Integrated Switching Regulator

PT6984 Performance Specifications (Unless otherwise stated, T

=25°C, Vin =12V, C1 =560µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)

a

PT6984 (3.3V/1.2V)

Characteristic Symbol Conditions Min Typ Max Units

Output Current Io

Io

Io

Io
Input Voltage Range V
Set Point Voltage Tolerance V

Temperature Variation Reg

Line Regulation Reg

Load Regulation Reg

Total Output Voltage Variation ∆V

1
2

1
2

in

tol Vo

o

temp

line

load

tot Includes set-point, line, load Vo

o

Ta =25°C, natural convection Vo1 (3.3V) 0.1

Ta =60°C, 200LFM airflow Vo1 (3.3V) 0.1

Vo2 (1.2V) 0 1.6

Vo2 (1.2V) 0 1.6

Over Io Range 10.8 — 13.2 VDC

–40° >Ta > +85°C Vo

Over Vin range Vo

Over Io range Vo

–40° >Ta > +85°C Vo

(i)

(i)

— ±16 ±50

1

Vo

— ± 6 ±18

2

— ±1.0 —

1

Vo

— ±0.5 —

2

— ±10 ±15 mV

1

Vo

—±5±7

2

— ±10 ±15

1

Vo

—±5±7

2

— ±69 —

1

— ±22 —

2

(ii)

7

(ii)

(ii)

7

(ii)

(iii)

8.6

1.6

8.6

1.6

A

(iii)

(iii)

A

(iii)

mV

%V

o

mV

mV

Efficiency η —78—%

Ripple (pk-pk) V

V

o

Transient Response t

Notes: (i) Io

(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.

1

(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io

and Io2 must be less than Io1max, and Io2 must be less than Io2max.

1

∆V

r

tr

tr

20MHz bandwidth Vo

—35—

1

Vo

—35—

2

1A/µs load step, 50% to 100% Iotyp — 6 0 — µs
Vo over/undershoot Vo

— ±50 —

1

Vo

— ±20 —

2

mV

mV

pp

PT6984 Typical Characteristics

Efficiency vs Io1 (See Note A)

90

85

80

75

70

65

Efficiency - %

60

55

50

01234567

Vo1 Output Ripple vs Io1 (See Note A)

70

60

50

40

30

Ripple - mV

20

10

0

01234567

Io1 (A

Io1 (A) [ Io2 fixed at Io

2

Io

2

0.5

0.75
1

1.25

1.6

Power Dissipation vs Io1 (See Note A)

8

7

6

5

4

Pd - Watts

3

2

1

0

01234567

Safe Operating Area, Vin =12V (See Note B)

90

80

70

60

50

40

Ambient Temperature (°C)

30

20

01234567

Io1 (A) [ Io2 fixed at Io

Io1 (A

2

Io

Airflow

200LFM
120LFM
60LFM
Nat conv

2

1.6

1.25

1.0

0.75

0.5

0.1

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

PT6985

)

(A)

(typ) ]

)

(A)

(typ)

)

9-A 12V-Input Dual Output
Integrated Switching Regulator

PT6985 Performance Specifications (Unless otherwise stated, T

=25°C, Vin =12V, C1 =560µF, C2 =330µF, Io1 =Io1typ, and Io2 =Io2typ)

a

PT6985 (2.5V/1.2V)

Characteristic Symbol Conditions Min Typ Max Units

Output Current Io

Io

Io

Io
Input Voltage Range V
Set Point Voltage Tolerance V

Temperature Variation Reg

Line Regulation Reg

Load Regulation Reg

Total Output Voltage Variation ∆V

1
2

1
2

in

tol Vo

o

temp

line

load

tot Includes set-point, line, load Vo

o

Ta =25°C, natural convection Vo1 (2.5V) 0.1

Ta =60°C, 200LFM airflow Vo1 (2.5V) 0.1

Vo2 (1.2V) 0 2

Vo2 (1.2V) 0 2

Over Io Range 10.8 — 13.2 VDC

–40° >Ta > +85°C Vo

Over Vin range Vo

Over Io range Vo

–40° >Ta > +85°C Vo

(i)

(i)

— ±12 ±38

1

Vo

— ± 6 ±18

2

— ±0.5 —

1

Vo

— ±0.5 —

2

— ±10 ±15 mV

1

Vo

—±5±7

2

— ±10 ±15

1

Vo

—±5±7

2

— ±44 —

1

— ±22 —

2

(ii)

7

(ii)

(ii)

7

(ii)

(iii)

9

2.2
9

2.2

A

(iii)

(iii)

A

(iii)

mV

%V

o

mV

mV

Efficiency η —77—%

Ripple (pk-pk) V

V

o

Transient Response t

Notes: (i) Io

(min) current of 0.1A can be divided between both outputs, Vo1 or Vo2. The module will operate at no load with reduced specifications.

1

(ii) The typical current is that which can be drawn simultaneously from both outputs under the stated operating conditions.
(iii) The sum of Io

and Io2 must be less than Io1max, and Io2 must be less than Io2max.

1

∆V

r

tr

tr

20MHz bandwidth Vo

—35—

1

Vo

—35—

2

1A/µs load step, 50% to 100% Iotyp — 6 0 — µs
Vo over/undershoot Vo

— ±50 —

1

Vo

— ±20 —

2

mV

mV

pp

PT6985 Typical Characteristics

Efficiency vs Io1 (See Note A)

90

85

80

75

70

65

Efficiency - %

60

55

50

01234567

Vo1 Output Ripple vs Io1 (See Note A)

30

25

20

15

Ripple - mV

10

5

0

01234567

Io1 (A

Io1 (A) [ Io2 fixed at Io

2

Io

2

Power Dissipation vs Io1 (See Note A)

7

6

5

1

1.5
2

4

3

Pd - Watts

2

1

0

01234567

Safe Operating Area, Vin =12V (See Note B)

90

80

70

60

50

40

Ambient Temperature (°C

30

20

01234567

Io1 (A) [ Io2 fixed at Io

Io1 (A

]

2

Airflow

200LFM
120LFM
60LFM
Nat conv

Io

2

2

1.5
1

0.1

Note A: Characteristic data has been developed from actual products tested at 25°C. This data is considered typical data for the Converter.
Note B: SOA curves represent the conditions at which internal components are at or below the manufacturer’s maximum operating temperatures

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6980 Series

Capacitor Recommendations for the

Dual-Output PT6980 Regulator Series

Input Capacitors:

The recommended input capacitance is determined by 1.0
ampere minimum ripple current rating and 330µF minimum

capacitance . Ripple current and <100mΩ equivalent se-

ries resistance (ESR) values are the major considerations,
along with temperature, when designing with different
types of capacitors. Tantalum capacitors have a recommended

minimum voltage rating of 2 × the maximum DC voltage +

AC ripple. This is necessary to insure reliability for input
voltage bus applications

Output Capacitors: C

(Required), C3(Optional)

2

The ESR of the required capacitor (C2) must not be greater

than 50mΩ. Electrolytic capacitors have poor ripple per-

formance at frequencies greater than 400kHz but excellent
low frequency transient response. Above the ripple fre­quency, ceramic capacitors are necessary to improve the
transient response and reduce any high frequency noise
components apparent during higher current excursions.
Preferred low ESR type capacitor part numbers are identified
in Table 1. The optional 100µF capacitor (C3) for V2out can

have an ESR of up to 200mΩ for optimum performance

and ripple reduction. (Note: Vendor part numbers for the

optional capacitor, C3, are not identified in the table. Use the
same series selected for C2)

Tantalum Capacitors

Tantalum type capacitors may be used at the output, but
only the AVX TPS series, Sprague 593D/594/595 series,
or Kemet T495/T510 series. The AVX TPS series, Kemet
or Sprague series tantalums are recommended over many
other types due to their higher rated surge, power dissipation,
and ripple current capability. As a caution, the TAJ series
by AVX is not recommended. This series has considerably
higher ESR, reduced power dissipation and lower ripple
current capability. The TAJ Series is also less reliable than
the AVX TPS series when determining power dissipation
capability. Tantalum or Oscon® types are recommended
for applications where ambient temperatures fall below 0°C.

Capacitor Table

Table 1 identifies the characteristics of capacitors from a
number of vendors with acceptable ESR and ripple current
(rms) ratings. The number of capacitors required at both the
input and output buses is identified for each capacitor type.

This is not an extensive capacitor list. Capacitors from other
vendors are available with comparable specifications. Those listed
are for guidance. The RMS ripple current rating and ESR
(Equivalent Series Resistance at 100kHz) are critical parameters
necessary to insure both optimum regulator performance and
long capacitor life.

Table 1: Input/Output Capacitors

roticapaC

/rodneV

tnenopmoC

seireS

cinosanaP

CF

detinU

noc-imehC

/ZXL/VXL

SF/XF

nocihciN

/LP

MP

cinosanaP

CF

gtMecafruS

/SSnocsOVS

XVA

mulatnaT

SPT

temeK

015T
594T

eugarpS

D495

N/R –Not recommended. The voltage rating does not meet the minimin operating limits.

gnikroW

egatloV)Fµ(eulaV

V53
V53
V05

V53
V05
V01
V02

V53
V52
V53

V53
V53
V53

V01
V01

V01
V01

V01
V01

V01Fµ033540.0 Ω Am0532

scitsiretcarahCroticapaCytitnauQ

tnelaviuqE)RSE(

ecnatsiseRseireS

Fµ086
Fµ065
Fµ086

Fµ086
Fµ086
Fµ093
Fµ051

065Fµ
028Fµ
065Fµ

033Fµ

0001Fµ

074Fµ

033Fµ

Fµ033

Fµ033
Fµ022

Fµ033
Fµ022

340.0 Ω

830.0 Ω

840.0 Ω

830.0 Ω

840.0 Ω

030.0 Ω

420.0 Ω

840.0 Ω

940.0 Ω

8400.0 Ω

560.0 ÷2Ω

830.0 Ω

340.0 Ω

520.0 Ω

520.0 Ω

060.0 ÷2Ω

060.0 ÷2Ω

330.0 Ω

70.0 Ω÷ 530.0=2 Ω

elppiRmumixaMC°58

)smrI(tnerruC

Am0961
Am5561
Am5381

Am0661
Am0481
Am0803
Am0023

Am0631
Am0431
Am0631

Am5021>
Am0002
Am0961

Am0053>

Am0083>

Am0052>

Am0003>

Am0041

Am0002>

lacisyhP

tupnI

)mm(eziS

51x61

02x5.21

02x61

02x5.21

02x61

5.01x8

5.01x8

51x61
51x61
51x61

5.61x5.21

5.61x81

5.61x61

5.01x0.01

3.01x3.01

xL3.7
xW3.4

W7.5xL3.7

H0.4x

xL3.7
xW0.6

H1.4

tuptuO

suB

suB

1

1

1

1

1

1

1

1

1

1

R/N

1

4

2

1

1

1

1

1

1

212

1
1

R/N

1

R/N

1

R/N

2

R/N

2

R/N

1

R/N

2

R/N1 T2R0100X733D495

rebmuNrodneV

S186V1CFUEE
S165V1CFUEE

186H1CFUEE

LL02X211M186BV53ZXL

LL02X61M186BV05ZXL
M093XF01
M051XF02

6HHM165V1LPU

6HHM128E1LPU

6HHM165V1MPU

QL133V1CFVEE

N1201V1CFVEE

N174V1CFVEE

M033SS01
M033VS01

)VS(tnuoMecafruS

0600R010M733VSPT
0600R010M722VSPT

SA010M733X015T
SA010M722X594T

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6980 Series

Adjusting the Output Voltage of the PT6980
Dual-Output Voltage Regulators

Each output voltage from the PT6980 series of integrated
switching regulators (ISRs) can be independently adjusted
higher or lower than the factory trimmed pre-set voltage.
The voltages, Vo
down using a single external resistor 1. Table 1 gives the
adjustment range for both Vo
the series as V
always be lower than Vo1 2.

Vo

Adjust Up: To increase the output, add a resistor R

1

between pin 16 (V1 Adjust) and pins 7-11 (GND) 1.

Vo

Adjust Down: Add a resistor (R3), between pin 16

1

(Vo1 Adjust) and pin 1 (Vo1 Sense) 1.

Vo

Adjust Up: Add a resistor R2 between pin 23

2

(Vo2 Adjust) and pins 7-11 (GND) 1.

Vo

Adjust Down: Add a resistor (R1) between pin 23

2

(Vo2 Adjust) and pin 22 (Vo2 Sense) 1.

Refer to Figure 1 and Table 2 for both the placement and value of
the required resistor.

Notes:

1. Use only a single 1% resistor in either the (R
location to adjust Vo1, and in the (R1) or R2 location to
adjust Vo
possible.

2. Vo2 must always be at least 0.2V lower than Vo1.

and Vo2 may be adjusted either up or

1

and Vo2 for each model in

(min) and Va(max). Note that Vo2 must

a

. Place the resistor as close to the ISR as

2

1

) or R

3

4

4

3. Both the Vo1 and Vo2 may be adjusted down to an
alternative bus voltage by making, (R

) or (R1)

3

respectively, a zero ohm link. Refer to the Table 1
footnotes for guidance.

4. Never connect capacitors to either the Vo

Adjust pins. Any capacitance added to these control

Vo

2

Adjust or

1

pins will affect the stability of the respective regulated
output.

5. Adjusting either voltage (Vo1 or Vo2) may increase the
power dissipation in the regulator, and change the
maximum current available at either output. Consult
the note on p.2 of the data sheet regarding Vo

/Vo

1

2

loading.

The adjust up and adjust down resistor values can also be
calculated using the following formulas. Be sure to select
the correct formula parameter from Table 1 for the output
and model being adjusted.

(R1) or (R3) =

(R2) or (R4) =

V

V

10 · V

– V

a

o

a

– V

o

a

r

– R

– R

kΩ

s

kΩ

s

– Vr )

10 (V

Where: Vo= Original output voltage, (Vo1 or Vo2)

Va= Adjusted output voltage
Vr= The reference voltage from Table 1
Rs= The series resistance from Table 1

Figure 1

Vo2 (sns)

4,5,6

V

IN

C

Vin

+

1

GND Vo2 (adj)

STBY

3

PT6980

237 - 11

Vo

Vo

Vo1 (adj)

16

Adj Down

18 - 21

2

12 - 15

1

(R3) (R1)

R4

R2

+

C

2

C

3

1

22

Vo1 (sns)

Adjust Up

COM COM

Adjust Vo

For technical support and more information, see inside back cover or visit www.ti.com

1

Adjust Vo

2

Vo

2

Vo

1

L

L

O

+

O

A

A

D

D

Application Notes

PT6980 Series

Table 1

ADJUSTMENT RANGE AND FORMULA PARAMETERS

Vo1 Bus Vo2 Bus
Series Pt # PT6981/85 PT6982/83/84 PT6984/85 PT6981/83 PT6936
Adj. Resistor (R3)/R4 (R3)/R4 (R1)/R2 (R1)/R2 (R1)/R2

Vo(nom) 2.5V 3.3V 1.2V 1.8V 2.5V
Va(min) 1.8V
Va(max) 3.6V 3.6V 1.5V
Vr 1.27V 1.27V 0.6125V 1.0V 1.0V

ΩΩ

Rs (k

Ω) 7.5 15.4 20.0 16.9 11.5

ΩΩ

*

2.5V

*

1.0V

(2)

†

#

†

1.5V

2.4V 3.0

1.8V

†

Ref. Note 3: * (R3) = Zero-ohm link

†(R1) = Zero-ohm link

#

(R2) = Zero-ohm link

Table 2

ADJUSTMENT RESISTOR VALUES

Vo1 Bus
Series Pt # PT6981/85 PT6982/83/84
Adj. Resistor (R3)/R4 (R3)/R4

Vo(nom) 2.5V 3.3V

Va(req’d)

1.8 (0.0)

1.85 (1.4)kΩ

1.9 (3.0)kΩ

1.95 (4.9)kΩ

2.0 (7.1)kΩ

2.05 (9.8)kΩ

2.1 (13.3)kΩ

2.2 (23.5)kΩ

2.3 (44.0)kΩ

2.4 (106.0)kΩ

2.5 (0.0)kΩ

2.6 120.0kΩ (3.6)kΩ

2.7 56.0kΩ (8.4)kΩ

2.8 34.8kΩ (15.2)kΩ

2.9 24.3kΩ (25.4)kΩ

3.0 17.9kΩ (42.3)kΩ

3.1 13.7kΩ (76.1)kΩ

3.2 10.6kΩ (178.0)kΩ

3.3 8.4kΩ

3.4 6.6kΩ 112.0k

3.5 5.2kΩ 48.1k

3.6 4.1kΩ 26.9k

R1/R3 = (Blue), R2/R4 = Black

Vo2 Bus
Series Pt # PT6984/85 PT6981/83 PT6982
Adj. Resistor (R1)/R2 (R1)/R2 (R1)/R2

Vo(nom) 1.2V 1.8V 2.5V

Va(req’d)

1.0 (0.0)kΩ

1.05 (9.2)kΩ

1.1 (28.8)kΩ

1.15 (87.5)kΩ

1.2

1.25 101.5kΩ

1.3 41.2kΩ

1.35 20.8kΩ

1.4 10.6kΩ

1.45 4.5kΩ

1.5 0.0kΩ (0.0)kΩ

1.55 (5.1)kΩ

1.6 (13.1)kΩ

1.65 (26.4)kΩ

1.7 (53.1)kΩ

1.75 (133.0)kΩ

1.8 (0.0)kΩ

1.85 183.0kΩ (1.6)kΩ

1.9 83.1kΩ (3.5)kΩ

1.95 49.8kΩ (5.8)kΩ

2.0 33.1kΩ (8.5)kΩ

2.05 23.1kΩ (11.8)kΩ

2.1 16.4kΩ (16.0)kΩ

2.2 8.1kΩ (28.5)kΩ

2.3 3.1kΩ (53.5)kΩ

2.4 0.0kΩ (129.0)kΩ

2.5

2.6 88.5kΩ

2.7 38.5kΩ

2.8 21.8kΩ

2.9 13.5kΩ

3.0 8.5kΩ

For technical support and more information, see inside back cover or visit www.ti.com

Application Notes

PT6980 Series

Using the Standby Function on the PT6980
Series of Dual-Output Voltage Regulators

Both output voltages of the 23-pin PT6980 dual-output
converter may be disabled using the regulator’s ‘Standby’
function. This function may be used in applications that
require power-up/shutdown sequencing, or wherever there
is a requirement to control the output voltage On/Off status
with external circuitry.

The standby function is provided by the STBY* control
(pin 3). If pin 3 is left open-circuit the regulator operates
normally, and provides a regulated output at both Vo
12–15) and Vo2 (pins 18–21) whenever a valid supply volt­age is applied to Vin (pins 4, 5, & 6) with respect to GND

1

(pins 7-11). If a low voltage

is then applied to pin-3 both
regulator outputs will be simultaneously disabled and the
input current drawn by the ISR will drop to a typical value
of 4mA. The standby control may also be used to hold-off
both regulator outputs during the period that input power is
applied.

The standby pin is ideally controlled using an open-collector
(or open-drain) discrete transistor (See Figure 1). The
open-circuit voltage is the input voltage +V

. Table 1 gives

in

the circuit parameters for this control input.

Table 1 Standby Control Parameters

Parameter Min TYP Max

Enable (VIH) — — Open circuit
Disable (VIL) –0.1V — 0.4V
V

(open circuit) — +Vin

STBY

I

STBY(IIL

) — — –0.5mA

1, 2

2

(pins

1

1

—

Figure 1

1

22

V1(sns)

V

in

Inhibit

V2(sns)

4, 5, 6

V

PT6984

IN

GND V2(adj)

STBY

Q1
BSS138

3

+

C

1

18–21

Vo

2

12–15

Vo

1

(adj)

V

1

237–11

16

+

C

2

Vo

Vo

+

C

3

COMCOM

Turn-On Time: Turning Q1 in Figure 1 off removes the low-
voltage signal at pin 3 and enables the PT6980 series
regulator. Following a delay of about 25ms, Vo

and Vo

1

rise together until the lower voltage, Vo2, reaches its set
output. Vo

continues to rise until both outputs reach full

1

regulation voltage. The total power-up time is less than
40ms, and is relatively independent of load, temperature,
and output capacitance. Figure 2 shows waveforms of the
output voltages, Vo
The turn-off of Q

and Vo2, for a PT6984 (3.3V/1.2V).

1

corresponds to the rise in V

1

STBY

. The
waveforms were measured with a 12V input voltage, and
with resistive loads of 5A and 1.25A at the Vo

and Vo

1

2

outputs respectively.

Figure 2

2

1

2

Notes:

1. The standby control input is Not compatible with TTL or

other devices that incorporate a totem-pole output drive. Use
only a true open-collector device, preferably a discrete bipolar
transistor (or MOSFET). To ensure the regulator output is
disabled, the control pin must be pulled to less than 0.4Vdc
with a low-level 0.5mA sink to ground.

2 The standby control input

requires no external pull-up resistor.
The open-circuit voltage of the STBY* pin is the input
voltage +V

.

in

3. When the regulator output is disabled the current drawn from
the input source is typically reduced to 4mA.

V1 (1V/Div)

V2 (1V/Div)

Vstby (10V/Div)

HORIZ SCALE: 5ms/Div

For technical support and more information, see inside back cover or visit www.ti.com

PACKAGE OPTION ADDENDUM

www.ti.com

13-Oct-2005

PACKAGING INFORMATION

Orderable Device Status

PT6981C ACTIVE SIP MOD

(1)

Package

Type

Package

Drawing

Pins Package

Qty

Eco Plan

ELH 23 10 TBD Call TI Level-3-215C-168HRS

ULE

PT6982C ACTIVE SIP MOD

ELH 23 10 TBD Call TI Level-3-215C-168HRS

ULE

PT6982N ACTIVE SIP MOD

ELF 23 10 TBD Call TI Level-1-215C-UNLIM

ULE

PT6983A ACTIVE SIP MOD

ELG 23 10 TBD Call TI Level-1-215C-UNLIM

ULE

PT6983C ACTIVE SIP MOD

ELH 23 10 TBD Call TI Level-3-215C-168HRS

ULE

PT6983N ACTIVE SIP MOD

ELF 23 10 TBD Call TI Level-1-215C-UNLIM

ULE

PT6984C ACTIVE SIP MOD

ELH 23 10 TBD Call TI Level-3-215C-168HRS

ULE

PT6984N ACTIVE SIP MOD

ELF 23 10 TBD Call TI Level-1-215C-UNLIM

ULE

(1)

The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in

a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.

(2)

Lead/Ball Finish MSL Peak Temp

(3)

(2)

Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check

http://www.ti.com/productcontent for the latest availability information and additional product content details.

TBD: The Pb-Free/Green conversion plan has not been defined.
Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements

for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered
at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes.
Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame
retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material)

(3)

MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder

temperature.

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Addendum-Page 1

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