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