Texas Instruments PT6424D, PT6424E, PT6424P, PT6425D, PT6425E Datasheet

For assistance or to order, call [phone]

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

26

Application Notes

Mechanical Outline

Product Selector Guide

Revised 5/15/98

Standard Application

C1 = Required 100µF electrolytic
C2 = Required 100µF electrolytic

Ordering Information

PT6424¨ = +1.5 Volts
PT6425¨ = +3.3 Volts
PT6426¨ = +1.8 Volts
PT6427¨ = +2.1 Volts
PT6428¨ = +1.2 Volts
PT6429¨ = +2.5 Volts

Pin-Out Information

Pin Function

1 Remote Sense
2 Do not connect
3 Do not connect
4V

in

5V

in

6V

in

7

GND

8

GND

9

GND

10

GND

11 V

out

12 V

out

13 V

out

14 V

out

Adjust

• Adjustable Output Voltage

• 85% Efficiency

• Small SIP Footprint

• Input Voltage Range: 4.5V to 5.5V

• Remote Sense Capability

The PT6420 is a new addition to
the Power Trends high performance
+5V to +3.3V, 3Amp family of 14-Pin
SIP (Single In-line Package) Integrated
Switching Regulators (ISRs). Only two
external capacitors are required for
proper operation.

Please note that this product does
not include short circuit protection.

3 AMP ADJUSTABLE INTEGRATED
SWITCHING REGULATOR

PT6420 Series

PT Series Suffix

(PT1234X)

Case/Pin
Configuration

Vertical Through-Hole

P

Horizontal Through-Hole

D

Horizontal Surface Mount

E

PT6420

POWER TRENDS

Note: Back surface
of product is
conducting metal.

PT6420

C2

100µF

+

COM

V

OUT

4,5,6

7,8,9,10

11,12,13

14

C1

100µF

+

V

IN

COM

R1

(VOUP)

R2

(VODOWN)

Remote

Sense

1

Pkg Style 310

Specifications

Characteristics

PT6420 SERIES

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

Output Current I

o

4.5V ≤ V

in

≤ 5.5V 0 — 3.0 A

Current Limit I

cl

V

in

= +5V — 3.6 5.0 A

Input Voltage Range V

in

0.1A ≤ I

o

≤ 3.0A 4.5 — 5.5 V

Output Voltage Tolerance ∆V

o

V

in

= +5V, Io = 3.0A

V

o-0.05 3.3 Vo+0.05 V

0°C ≤ Ta ≤ +70°C

Line Regulation Reg

line

4.5V ≤ V

in

≤ 5.5V, I

o

= 3.0A — ±10 ±25 mV

Load Regulation Reg

load

Vin = +5V, 0.3 ≤ I

o

≤ 3.0A — ±10* ±25* mV

Vo Ripple/Noise V

n

V

in

= 5V, Io = 3.0A — 66 165 mVpp

Transient Response t

tr

Io step between 1.5A and 3.0A — 200 — µSec

with C2 = 100µF V

os

Vo over/undershoot — 200 — mV

Efficiency η V

in

= +5V, Io = 1.5A Vo= 3.3V — 85 — %

V

o= 1.8V — 74 — %

V

o= 2.1V — 77 — %

Vo= 1.2V — 63 — %

Switching Frequency ƒ

o

4.5V ≤ V

in

≤ 5.5V

500 650 800 kHz

0.3A ≤ I

o

≤ 3.0A

Absolute Maximum T

a

0—+85°C

Operating Temperature Range
Recommended Operating T

a

Free Air Convection (40-60 LFM)

0 — +70** °C

Temperature Range At Vin= 5V, Io=2.5A

Thermal Resistance θ

ja

Free Air Convection (40-60 LFM) — 25 — °C/W

Storage Temperature T

s

— -40 — +125 °C

Mechanical Shock Per Mil-STD-883D, Method 2002.3 , 1 msec,

— 500 — G’s

Half Sine, mounted to a fixture

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

20-2000 Hz, Soldered in a PC board

—15—G’s

Weight — — — 6.5 — grams
*When used with remote sense function.
**See Thermal Derating chart.

Note:

The PT6420 Series requires two 100µF electrolytic or tantalum capacitors for proper operation in all applications.

For assistance or to order, call [phone]

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

www.powertrends.com

27

5V to 3.x Converters

5V Bus Products

DATA SHEETS

CHARACTERISTIC DATA

0

0.5

1

1.5

2

2.5

3

4.5 4.75 5 5.25 5.5

PT6427, 2.1 VDC (See Note 1)

Efficiency vs Output Current

Ripple vs Output Current

Power Dissipation vs Output Current

Note 1:Note 1:

Note 1:Note 1:

Note 1: All data listed in the above graphs except for derating data has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)

40

50

60

70

80

90

100

0 0.5 1 1.5 2 2.5 3

4.5V

5.0V

5.5V

Vin

0

0.2

0.4

0.6

0.8

1

1.2

1.4

1.6

1.8

2

0 0.5 1 1.5 2 2.5 3

5.5V

5.0V

4.5V

Vin

Efficiency - %Ripple-(mV)PD-(Watts)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

PT6420 Series

Thermal Derating (Ta) (See Note 2)

Iout-(Amps)

Vin-(Volts)

Efficiency vs Output Current

Ripple vs Output Current

Power Dissipation vs Output Current

Efficiency - %Ripple-(mV)PD-(Watts)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Thermal Derating (Ta) (See Note 2)

Iout-(Amps)

Vin-(Volts)

PT6425, 3.3 VDC (See Note 1)

Efficiency vs Output Current

Ripple vs Output Current

Power Dissipation vs Output Current

Efficiency - %Ripple-(mV)PD-(Watts)

Iout-(Amps)

Iout-(Amps)

Iout-(Amps)

Thermal Derating (Ta) (See Note 2)

Iout-(Amps)

Vin-(Volts)

PT6428 1.2 VDC (See Note 1)

0

0.5

1

1.5

2

2.5

3

4.5 4.75 5 5.25 5.5

40

50

60

70

80

90

100

0.0 0.5 1.0 1.5 2.0 2.5 3.0

4.5V

5.0V

5.5V

Vin

85°C

0.0

0.5

1.0

1.5

2.0

2.5

3.0

0.0 0.5 1.0 1.5 2.0 2.5 3.0

5.5V

5.0V

4.5V

Vin

0

20

40

60

80

100

0 0.5 1 1.5 2 2.5 3

5.5V

5.0V

4.5V

Vin

40

50

60

70

80

90

100

0 0.5 1 1.5 2 2 .5 3

4.5V

5.0V

5.5V

Vin

0

0.5

1

1.5

2

2.5

3

4.5 4.75 5 5.25 5.5

85°C

0

0.5

1

1.5

2

2.5

00.511.522.53

5.5V

5.0V

4.5V

Vin

0

20

40

60

80

100

00.511.522.53

5.5V

5.0V

4.5V

Vin

85°C

0

20

40

60

80

100

00.511.522.53

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

PT6420 Series

More Applcation Notes

Adjusting the Output Voltage of the PT6420 Series
3AMP 5V Bus Converters

The output voltage of the Power Trends PT6420 Series ISRs
may be adjusted higher or lower than the factory trimmed pre­set voltage with the addition of a single external resistor. Table 1
accordingly gives the allowable adjustment range for each model
in the series as Va (min) and Va (max).

Adjust Up: (See note 1)
An increase in the output voltage is obtained by adding a resistor
R1, between pin 14 (Vo adjust) and pins 11-13 (V

out

).

Adjust Down: (See note 1)
Add a resistor (R2), between pin 14 (V

o

adjust) and pins 7-10

(GND).

Refer to Figure 1 and Table 2 for both the placement and value
of the required resistor; either R1 or (R2) as appropriate.

Notes:

1. The direction in which each resistor adjusts the output of the
PT6420 series differs from many other Power Trends prod­ucts. These output voltage adjustment notes are therefore
specific only to the PT6420 models.

2. Use only a single 1% resistor in either the R1 or (R2) loca­tion. Place the resistor as close to the ISR as possible.

3. Never connect capacitors from V

o

adjust to either GND,

V

out

, or the Remote Sense pin. Any capacitance added to

the Vo adjust pin will affect the stability of the ISR.

4. The PT6420 incorporates a Remote Sense (See Figure 1).
If this feature is being used, connecting the resistor R1
between pin 14 (V

o

adjust) and pin 1 (Remote Sense) can

benefit load regulation.

5. An increase in the output voltage may place additional limits
on the input voltage range of the part. The revised mini­mum input voltage will be (V

out

+ 1.2) or 4.5V, whichever is

higher. Do not exceed 5.5Vdc.

Table 1

PT6420 ADJUSTMENT RANGE

Series Pt # PT6428 PT6424 PT6426 PT6427 PT6429 PT6425
Vo (nom) 1.2 1.5 1.8 2.1 2.5 3.3

Va (min) 1.1 1.3 1.5 1.8 2.1 2.8
Va (max) 1.4 1.8 2.2 2.6 3.1 3.8

Figure 1

R1
Adjust Up

C1
100

µ

F

C2
100

µ

F

Vo

COMCOM

Vin

+ +

(R2)
Adj Down

L
O
A
D

PT6420

11,12,13

147,8,9,10

4,5,6

Vin Vo

GND Vo

(adj)

1

Vsense

The values of R1 [adjust up], and (R2) [adjust down], can
also be calculated using the following formulae.

12.45 V

o

R1 =

(V

a

– Vo)

– 49.9 k

Ω

12.45 (2Va – Vo)
– 49.9 k

Ω

(R2) =

V

o

– V

a

Where: Vo= Original output voltage

V

a

= Adjusted output voltage

For assistance or to order, call [phone]

4

Application

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

Notes

PT6420 Series

Table 2

PT6420 ADJUSTMENT RESISTOR VALUES

Series Pt # PT6428 PT6424 PT6426 PT6427 PT6429 PT6425
Vo (nom) 1.2 1.5 1.8 2.1 2.5 3.3
Va (req’d)

1.1 (74.6)kΩ

1.15 (224.0)kΩ

1.2

1.25 249.0kΩ

1.3 99.5kΩ (18.6)kΩ

1.35 49.7kΩ (49.7)kΩ

1.4 24.8kΩ (112.0)kΩ

1.45 (299.0)kΩ

1.5 (0.0)kΩ

1.55 324.0kΩ (14.8)kΩ

1.6 137.0kΩ (37.3)kΩ

1.65 74.6kΩ (74.6)kΩ

1.7 43.5kΩ (149.0)kΩ

1.75 24.8kΩ (373.0)kΩ

1.8 12.4kΩ (12.4)kΩ

1.85 398.0kΩ (29.8)kΩ

1.9 174.0kΩ (55.9)kΩ

1.95 99.5kΩ (99.5)kΩ

2.0 62.2kΩ (187.0)kΩ

2.05 39.7kΩ (448.0)kΩ

2.1 24.8kΩ (3.0)kΩ

2.15 14.1kΩ 473.0kΩ (14.1)kΩ

2.2 6.1kΩ 212.0kΩ (29.0)kΩ

2.25 124.0kΩ (49.7)kΩ

2.3 80.8kΩ (80.8)kΩ

2.35 54.7kΩ (133.0)kΩ

2.4 37.3kΩ (236.0)kΩ

2.45 24.8kΩ (548.0)kΩ

2.5 15.5kΩ

2.55 8.2kΩ 573.0kΩ

2.6 2.4kΩ 261.0kΩ

2.65 158.0kΩ

2.7 106.0kΩ

2.75 74.6kΩ

2.8 53.9kΩ (7.4)kΩ

2.85 39.0kΩ (16.5)kΩ

2.9 27.9kΩ (27.9)kΩ

2.95 19.3kΩ (42.6)kΩ

3.0 12.4kΩ (62.2)kΩ

3.1 2.0kΩ (131.0)kΩ

3.2 (336.0)kΩ

3.3

3.4 361.0kΩ

3.5 156.0kΩ

3.6 87.0kΩ

3.7 52.8kΩ

3.8 32.3kΩ

R1 = Black R2 = (Red)

IMPORTANT NOTICE

T exas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue
any product or service without notice, and advise customers to obtain the latest version of relevant information
to verify, before placing orders, that information being relied on is current and complete. All products are sold
subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those
pertaining to warranty, patent infringement, and limitation of liability.

TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in
accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent
TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily
performed, except those mandated by government requirements.

CERT AIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF
DEATH, PERSONAL INJURY, OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL
APPLICATIONS”). TI SEMICONDUCTOR PRODUCTS ARE NOT DESIGNED, AUTHORIZED, OR
WARRANTED TO BE SUITABLE FOR USE IN LIFE-SUPPORT DEVICES OR SYSTEMS OR OTHER
CRITICAL APPLICATIONS. INCLUSION OF TI PRODUCTS IN SUCH APPLICA TIONS IS UNDERSTOOD T O
BE FULLY AT THE CUSTOMER’S RISK.

In order to minimize risks associated with the customer’s applications, adequate design and operating
safeguards must be provided by the customer to minimize inherent or procedural hazards.

TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent
that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other
intellectual property right of TI covering or relating to any combination, machine, or process in which such
semiconductor products or services might be or are used. TI’s publication of information regarding any third
party’s products or services does not constitute TI’s approval, warranty or endorsement thereof.

Copyright  1999, Texas Instruments Incorporated