Datasheet PT6931N, PT6932A, PT6932C, PT6932N, PT6931A Datasheet (Texas Instruments)

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PT6930 Series

Standard Application

5V TO 3.3V/2.5V 25 WATT DUAL OUTPUT
INTEGRATED SWITCHING REGULATOR

Ordering Information

PT6931

❏❏

❏❏

❏ = +3.3 Volts

+2.5/+1.8 Volts

PT6932

❏❏

❏❏

❏ = +3.3 Volts

+1.5 Volts

C1 = Req’d 560µF electrolytic

(1)

C2 = Req’d 330µF electrolytic

(1)

C3 = Optional 100µF electrolytic

Features

• Dual Outputs:

+3.3V/6A
+2.5V/2.2A or +1.8V/1.5A

• Adjustable Output Voltage

• Remote Sense (both outputs)

• Standby Function

• Over-Temperature Protection

• Soft-Start

• Internal Sequencing

• 23-pin Excalibur™ Package

Pin Function

1V

1

Remote Sense

2 Do Not Connect

3 STBY

4V

in

5V

in

6V

in

7 GND

8 GND

9 GND

10 GND

11 GND

12 V

1out

Pin Function

13 V

1out

14 V

1out

15 V

1out

16 V

1

Adjust

17 Do Not Connect

18 V

2out

19 V

2out

20 V

2out

21 V

2out

22 V

2

Remote Sense

23 V

2

Adjust*

Pin-Out Information

The PT6930 is a new series of 25W
dual output ISRs designed to power the
latest generation DSP chips. Both output
voltages are independently adjustable
with external resistors. In addition, the
second output voltage of the PT6931 can
be selected for either 2.5V or 1.8V to
accommodate the next generation of
DSP chips. The internal power
sequencing of both outputs meet the
requirements of TI’s ‘C6000 series DSPs.

(For dimensions and PC board layout,
see Package Styles 1320 and 1330.)

PT6930

C2

+

GND

V

IN

GND

4,5,6

7-11

12-15

18-21

16

C1

22

C3

+

23

1

3

STBY

V2

SENSE

V1

SENSE

V1

OUT

V2

OUT

PT Series Suffix

(PT1234X)

Case/Pin
Configuration

Vertical Through-Hole

N

Horizontal Through-Hole

A

Horizontal Surface Mount

C

*Note: for PT6931 only:

with pin 23 open, V2out=2.5V
with pin 23 shorted to pin 22, V2out=1.8V

SLTS062 - DECEMBER 1999

Application Notes

Mechanical Outline

Product Selector Guide

Patent pending on package assembly

New Space-Saving Package

Preliminary Specifications

Characteristics

PT6930 SERIES

(Ta= 25°C unless noted) Symbols Conditions Min Typ Max Units

Output Current I

o

T

a

= +60°C, 200 LFM, pkg N V

1

= 3.3V 0.1

(2)

—5.5

(3)

V

2

= 2.5V 0 — 2.2

(3)

A

V

2

= 1.8V 0 — 1.75

(3)

V

2

= 1.2V 0 — 1.2

(3)

T

a

= +25°C, natural convection V

1

= 3.3V 0.1 — 6.0

V

2

= 2.5V 0 — 2.2

A

V

2

= 1.8V 0 — 1.75

V

2

= 1.2V 0 — 1.2

Input Voltage Range V

in

0.1A ≤ I

o

≤ I

max

4.5 — 5.5 V

Output Voltage Tolerance ∆V

o

V

in

= +5V, Io = I

max,

both outputs

V

o-0.1 — Vo+0.1 V

0°C ≤ Ta ≤ +65°C

Line Regulation Reg

line

4.5V ≤ V

in

≤ 5.5V, I

o

= I

max

V

1

= 3.3V — ±7 ±17

mV

V

2

= 2.5V — ± 7 ±13

Load Regulation Reg

load

V

in

= +5V, 0.1 ≤ I

o

≤ I

max

V

1

= 3.3V — ±17 ±33

mV

V

2

= 2.5V — ± 4 ±10

Vo Ripple/Noise V

n

V

in

= +5V, Io = I

max

V

1

= 3.3V — 50 —

mV

V

2

= 2.5V — 2 5 —

Transient Response t

tr

Io step between 0.5xI

max

and I

max

— 25 — µSec

with C

2

= 330µF V

os

Vo over/undershoot V

1

= 3.3V — 60 —

mV

V

2

= 2.5V — 6 0 —

Efficiency η V

in

= +5V, Io = 4A total — 75 — %

Switching Frequency ƒ

o

4.5V ≤ V

in

≤ 5.5V

475

600 725

kHz

0.1A ≤ I

o

≤ I

max

Absolute Maximum T

a

—

-40

(4)

— +85

(5)

°C

Operating Temperature Range

Storage Temperature T

s

— -40 — +125 °C

Weight — Vertical/Horizontal — 29 — grams

Notes:

(1) The PT6930 series requires a 560µF electrolytic capacitor on the input and a 330µF electrolytic capacitor on the output for proper operation in all applications.
(2) I

o

min current of 0.25A can be divided btween both outputs; V1, or V2. The ISR will operate down to no-load with reduced specifications.

(3) I

o

max listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum.
(4) For operating temperatures below 0°C, use tantalum type capacitors on both the input and output.
(5) See Safe Operating Area curves for appropriate derating.

For assistance or to order, call [phone]

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CHARACTERISTIC DATA

20.0

30.0

40.0

50.0

60.0

70.0

80.0

90.0

0.0 1.0 2.0 3.0 4.0 5.0 6.0

Output Current (A)

Ambient Temperature ( C)

200LFM
120LFM
60LFM
Nat conv

Airflow

PT6930 Series

Note:Note:

Note:Note:

Note: All data listed in the above graphs has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.

PT6931, V2out = 2.5V , I2out = 2.2A (See Foot Note)

Total Efficiency vs I1out

Total Power Dissipation vs I1out

Safe Operating Area vs I1out

V1out Ripple vs I1out

40

50

60

70

80

90

0123456

Output Current (A)

Efficiency (%)

4.5V

5.0V

5.5V

Vin

0

10

20

30

40

0123456

Output Current (A)

Ripple (mV)

5.5V

5.0V

4.5V

Vin

0

2

4

6

8

0123456

Output Current (A)

PDiss (Watts)

5.5V

5.0V

4.5V

Vin

For assistance or to order, call [phone]

3

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

Application Notes

PT6920/PT6930 Series

More Application Notes

Adjusting the Output Voltage of the PT6920 and
PT6930 Dual Output Voltage ISRs

Each output voltage from the PT6920 and PT6930 series of
ISRs can be independantly adjusted higher or lower than the
factory trimmed pre-set voltage. V

1

(the voltage at V1out), or

V

2

(the voltage at V2out) may each be adjusted either up or

down using a single external resistor

2

. Table 1 gives the adjust-

ment range for both V

1

and V2 for each model in the series as

V

a

(min) and Va(max). Note that V2 must always be lower

than V

1

3.

V

1

Adjust Up: To increase the output, add a resistor R4 be-

tween pin 16 (V

1

Adjust) and pins 7-11 (GND) 2.

V

1

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

(V1 Adjust) and pin 1 (V1 Remote Sense) 2.

V

2

Adjust Up: Add a resistor R2 between pin 23 (V2 Adjust)

and pins 7-11 (GND)

2

.

V

2

Adjust Down: Add a resistor (R1) between pin 23 (V2 Adjust)

and pin 22 (V

2

Remote Sense) 2.

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

Notes:

1. The output voltages, V1out and V2out, may be adjusted
independantly.

2. Use only a single 1% resistor in either the (R3) or R4 loca­tion to adjust V1, and in the (R1) or R2 location to adjust V2.
Place the resistor as close to the ISR as possible.

3. V

2

must always be at least 0.2V lower than V1.

4. V

2

on both the PT6921 and PT6931 models may be
adjusted from 2.5V to 1.8V by simply connecting pin 22
(V2 Remote Sense) to pin 23 (V2 Adjust). For more details,
consult the data sheet.

Table 1

PT6920 ADJUSTMENT RANGE AND FORMULA PARAMETERS

Output Bus V1 out V2 out
Series Pt #
Standard Case PT6921/22 PT6921 PT6922
Excalibur Case PT6931/32 PT6931 PT6932
Adj. Resistor (R3)/R4 (R1)/R2 (R1)/R2

Vo(nom) 3.3V 2.5V 1.5
Va(min) 2.3V 1.8V 1.2
Va(max) 3.6V 3.0V 3.0
Ro (k

ΩΩ

ΩΩ

Ω) 12.1 10.0 9.76

Rs (k

ΩΩ

ΩΩ

Ω) 12.1 11.5 6.49

Figure 1

C

1

+

C

2

+

C

3

+

R4

(R3) (R1)

R2

L
O
A
D

L
O
A
D

Adj Down

Adjust Up

Vin

COM COM

V2

out

V1

out

PT6920

18 - 21

237 - 11

4,5,6

Vin

V2

out

GND Vo2(adj)

V1(sns)

1

16

Vo

1

(adj)

12 - 15

V1

out

V2(sns)

22

STBY

3

Adjust V1

out

Adjust V2

out

5. If V1 is increased above 3.3V, the minimum input voltage to
the ISR must also be increased. The minimum required
input voltage must be (V1 + 1.2)V or 4.5V, whichever is
greater. Do not exceed 5.5V

6. Never connect capacitors to either the V

1

Adjust or
V2 Adjust pins. Any capacitance added to these control pins
will affect the stability of the respective regulated output.

7. Adjusting either voltage (V1 or V2) may increase the power
dissipation in the regulator, and correspondingly change the
maximum current available at either output. Consult the
factory for application assistance.

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) =

R

o

(Va – 1)

– R

s

kΩ

Vo – V

a

R2 or R4 =

R

o

– R

s

kΩ

Va – V

o

Where: Vo= Original output voltage, (V1 or V2)

V

a

= Adjusted output voltage

R

o

= The resistance value from Table 1

R

s

= The series resistance from Table 1

For assistance or to order, call [phone]

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Application

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Notes

PT6920/PT6930 Series

1.2 (0.0)kΩ

1.25 (3.3)kΩ

1.3 (8.2)kΩ

1.35 (16.3)kΩ

1.4 (32.6)kΩ

1.45 (81.4)kΩ

1.5

1.55 189.0kΩ

1.6 91.1kΩ

1.65 58.6kΩ

1.7 42.3kΩ

1.75 32.6kΩ

1.8 (0.0)kΩ 26.0kΩ

1.85 (1.6)kΩ 21.4kΩ

1.9 (3.5)kΩ 17.9kΩ

1.95 (5.8)kΩ 15.2kΩ

2.0 (8.5)kΩ 13.0kΩ

2.05 (11.8)kΩ 11.3kΩ

2.1 (16.0)kΩ 9.8kΩ

2.15 (21.4)kΩ 8.5kΩ

2.2 (28.5)kΩ 7.5kΩ

2.25 (38.5)kΩ 6.5kΩ

2.3 (3.6)kΩ (53.5)kΩ 5.7kΩ

2.35 (5.1)kΩ (78.5)kΩ 5.0kΩ

2.4 (6.7)kΩ (129.0)kΩ 4.4kΩ

2.45 (8.5)kΩ (279.0)kΩ 3.8kΩ

2.5 (10.6)kΩ 3.3kΩ

2.55 (12.9)kΩ 189.0kΩ 2.8kΩ

2.6 (15.6)kΩ 88.5kΩ 2.4kΩ

2.65 (18.6)kΩ 55.2kΩ 2.0kΩ

2.7 (22.2)kΩ See Note 3 38.5kΩ 1.6kΩ

2.75 (26.4)kΩ 28.5kΩ 1.3kΩ

2.8 (31.5)kΩ 21.8kΩ 1.0kΩ

2.85 (37.6)kΩ 17.1kΩ 0.7kΩ

2.9 (45.4)kΩ 13.5kΩ 0.5kΩ

2.95 (55.3)kΩ 10.7kΩ 0.2kΩ

3.0 (68.6)kΩ 8.5kΩ 0.0kΩ

3.05 (87.1)kΩ

3.1 (115.0)kΩ

3.15 (161.0)kΩ

3.2 (254.0)kΩ

3.25 (532.0)kΩ

3.3

3.4 109.0kΩ See Note 5

3.5 48.4kΩ

3.6 28.2kΩ

R1/R3 = (Red) R2/R4 = Black

Table 2

PT6920/PT6930 ADJUSTMENT RESISTOR VALUES

Output Bus V1out V2out
Series Pt#
Standard Case PT6921/6922 PT6921 PT6922
Excalibur Case PT6931/6932 PT6931 PT6932
Adj Resistor (R3)/R4 (R1)/R2 (R1)/R2
Vo(nom) 3.3Vdc 2.5Vdc 1.5Vdc

Va(req’d)

For assistance or to order, call [phone]

5

Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com

Application Notes

PT6920/PT6930 Series

More Application Notes

Using the Standby Function on the PT6920 and
PT6930 Dual Output Voltage Converters

Both output voltages of the 23-pin PT6920/6930 dual output
converter may be disabled using the regulator’s standby function.
This function may be used in applications that require power­up/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 V1out (pins 12–15) and
V

2

out (pins 18–21) whenever a valid supply voltage is applied to

V

in

(pins 4, 5, & 6) with respect to GND (pins 7-11). If a low

voltage

2

is then applied to pin-3 both regulator outputs will be
simultaneously disabled and the input current drawn by the ISR
will typcially drop to less than 30mA (50mA max). 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). It may also be
driven directly from a dedicated

TTL3 compatible gate. Table 1

provides details of the threshold requirements.

Table 1 Inhibit Control Thresholds

2,3

Parameter Min Max

Enable (VIH) 1.8V Vin
Disable (VIL) –0.1V 0.8V

Notes:

1. The Standby/Inhibit control logic is similar for all Power

Trends’ modules, but the flexibility and threshold tolerances
will be different. For specific information on this function
for other regulator models, consult the applicable application
note.

2. The Standby control pin is ideally controlled using an open-

collector (or open-drain) discrete transistor and requires no
external pull-up resistor. To disable the regulator output, the
control pin must be pulled to less than 0.8Vdc with a low­level 0.5mA sink to ground.

3. The Standby input on the PT6920/6930 series may be

driven by a differential output device, making it directly
compatible with TTL logic. The control input has an inter­nal pull-up to the input voltage V

in

. A voltage of 1.8V or
greater ensures that the regulator is enabled. Do not use
devices that can drive the Standby control input above 5.5V
or Vin.

Figure 1

Turn-On Time: Turning Q1 in Figure 1 off removes the low-

voltage signal at pin 3 and enables both outputs from the
PT6920/6930 regulator. Following a delay of about 5–10ms,
V

1

out and V2out rise together until the lower voltage, V2out,

reaches its set output. V

1

out then continues to rise until both
outputs reach full regulation voltage. The total power-up time is
less than 15ms, and is relatively independant of load, tempera­ture, and output capacitance. Figure 2 shows waveforms of the
input current Iin, and output voltages V1out and V2out, for a
PT6921 (3.3V/2.5V). The turn-off of Q

1

corresponds to
t =0 secs. The waveforms were measured with a 5Vdc input
voltage, and with resistive loads of 5.5A and 2.2A at the V1out
and V

2

out outputs respectively.

Figure 2

C

1

+

C

2

+

Inhibit

V

in

V2out

COMCOM

Q1
BSS138

+5V V

in

PT6921

18 - 21

237 - 11

4,5,6

Vin

V2

out

GND Vo2(adj)

V1(sns)

1

16

V0

1

(adj)

12 - 15

V1

out

V2(sns)

22

STBY

3

V1out

C

3

+

02468101214

t (milli - secs)

V

1

(

2V/Div

)

V(2V/Div

)

I(4A/Div

)