Standard Application
C
1
= Required 330µF electrolytic
C
2
= Required 330µF electrolytic
Q
1
= NFET-or Open Collector Gate
6 AMP 12V INPUT
INTEGRATED SWITCHING REGULATOR
P T 6 6 2 0
S e r i e s
PT6620
4,5,6
7,8,9,10
11,12,13
V
IN
COM
COM
V
OUT
C
2
+
C
1
+
1
3
STBY
Q
1
REMOTE SENSE
LOAD
Ordering Information
PT6621
¨ = +3.3 Volts
PT6622
¨ = +1.5 Volts
PT6623
¨ = +2.5 Volts
PT6624
¨ = +3.6 Volts
PT6625
¨ = +5.0 Volts
PT6626
¨ = +9.0 Volts
•
Single Device: 6A Output
•
Input Voltage Range: 9V to 14V
•
Adjustable Output Voltage
•
83% Efficiency
•
Remote Sense Capability
•
Standby Function
•
Over-Temperature Protection
The PT6620 series is a new addition
to Power Trends’ line of 12V bus Inte-
grated Switching Regulators (ISRs).
Designed for stand-alone operation in
applications requiring as much as 6A of
output current, the PT6620 is packaged
in a 14-Pin SIP (Single In-line Package)
and is available in a surface-mount con-
figuration.
Only two external capacitors are
required for proper operation. Please
note that this product does not include
short circuit protection.
PT Series Suffix
(PT1234
X
)
Case/Pin
Heat
Heat Spreader
Configuration
Spreader with Side Tabs
Vertical Through-Hole
P
R
Horizontal Through-Hole
D
G
Horizontal Surface Mount
E
B
Pin
Function
1
Remote Sense
2
Do Not Connect
3
STBY*- Standby
4
V
in
5
V
in
6
V
in
7
GND
8
GND
9
GND
10
GND
11
V
out
12
V
out
13
V
out
14
V
out
Adjust
Pin-Out Information
For assistance or to order, call
(800) 531-5782
48
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
Note: Back surface
of product is
conducting metal
Pkg Style 400
Specifications
Characteristics
PT6620 SERIES
(T
a
= 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
I
o
T
a
= 60°C, 200 LFM, pkg P
0.1*
—
6.0**
A
T
a
= 25°C, natural convection
0.1*
—
6.5**
A
Input Voltage Range
V
in
0.1A
≤
I
o
≤
6.0A
V
o
≤
+5V
+9
—
+14
V
+6V
≤
V
o
≤
+9V
V
o
+3
—
+14
V
Output Voltage Tolerance
∆
V
o
V
in
= +12V, I
o
= 6.0A
T
a
= 0 to 60°C
V
o
-0.1
—
V
o
+0.1
V
Output Voltage Adjust Range
V
oadj
Pin 14 to V
o
or ground
V
o
= +3.3V
2.3
—
4.5
V
o
= +1.5V
1.4
—
2.7
V
o
= +2.5V
1.9
—
3.7
V
V
o
= +3.6V
2.5
—
4.8
V
o
= +5.0V
2.9
—
6.5
V
o
= +9.0V
5.2
—
10.0
Line Regulation
Reg
line
+9V
≤
V
in
≤
+14V, I
o
= 6.0A
—
±0.5
±1.0
%V
o
Load Regulation
Reg
load
V
in
= +12V, 0.1
≤
I
o
≤
6.0A
—
±0.5
±1.0
%V
o
V
o
Ripple/Noise
V
n
V
in
= +12V, I
o
= 6.0A V
o
< +6V
—
50
—
mVpp
V
o
> +6V
—
1.0
—
%V
o
Transient Response
t
tr
I
o
step between 3.0A and 6.0A
—
100
—
µSec
with C
2
= 330µF
V
os
V
o
over/undershoot
—
150
—
mV
Efficiency
η
V
in
= +12V, I
o
= 3.0A V
o
= +3.3/3.6V
—
84
—
%
V
o
= +1.5V
—
68
—
%
V
o
= +2.5V
—
76
—
%
V
o
= +5.0V
—
86
—
%
V
o
= +9.0V
—
93
—
%
V
in
= +12V, I
o
=6.0A V
o
= +3.3/3.6V
—
83
—
%
V
o
= +1.5V
—
66
—
%
V
o
= +2.5V
—
75
—
%
V
o
= +5.0V
—
85
—
%
V
o
= +9.0V
—
92
—
%
*
ISR will operate down to no load with reduced specifications.
**
See SOA curves - Output power is limited to 30W maximum.
Note: The PT6620 Series requires a 330µF(output) and 330µF(input) electrolytic capacitors for proper operation in all applications.
Revised 2/5/99
Application Notes
Mechanical Outline
Product Selector Guide
C H A R A C T E R I S T I C D A T A
P T 6 6 2 0
S e r i e s
For assistance or to order, call
(800) 531-5782
49
12V Bus Products
DA
T
A
SHEETS
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
PT6621P, 3.3V
Note:
SOA curves represent operating conditions at which internal components are at or below manufacturer’s maximum rated operating temperatures.
Efficiency vs Output Current
Efficiency (%)
Output Current (A)
Ambient Temperature (°C)
Output Current (A)
Airflow
Recommended Maximum
Operating Temperature
Ambient Temperature (°C)
Output Current (A)
Airflow
PT6620 Series @V
PT6620 Series @V
PT6620 Series @V
PT6620 Series @V
PT6620 Series @Vin=+12V
in=+12V
in=+12V
in=+12V
in=+12V
Recommended Maximum
Operating Temperature
Specifications (continued)
Characteristics
PT6620 SERIES
(T
a
= 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Switching Frequency
ƒ
o
9V
≤
V
in
≤
14V
500
650
775
kHz
0.1A
≤
I
o
≤
6.0A
PT6622
500
550
600
kHz
Recommended Operating
T
a
Free Air Convection (40-60 LFM)
-40
—
+65**
°C
Temperature Range
Over V
in
and
I
o
ranges with heat tab
Absolute Maximum
T
a
-40
—
+85
°C
Operating Temperature Range
Storage Temperature
T
s
—
-40
—
+125
°C
Mechanical Shock
—
Per Mil-STD-883D, Method 2002.3
—
500
—
G’s
Mechanical Vibration
—
Per Mil-STD-883D, Method 2007.2,
—
7.5
—
G’s
20-2000 Hz, soldered in a PC board
Weight
—
—
—
14
—
grams
**
See SOA curves - Output power is limited to 30W maximum.
Note:
The PT6620 Series requires a 330µF(output) and 100µF(input) electrolytic capacitors for proper operation in all applications.
PT6622P, 1.5V
Output Ripple vs Output Current
Power Dissipation vs Output Current
Output Current (A)
Output Current (A)
Ripple (mVpp)
Pd (Watts)
Safe Operating Area Curves @V
Safe Operating Area Curves @V
Safe Operating Area Curves @V
Safe Operating Area Curves @V
Safe Operating Area Curves @Vin=+12V
in=+12V
in=+12V
in=+12V
in=+12V
20
30
40
50
60
70
80
90
0
1
2
3
4
5
6
7
Nat conv
60LFM
120LFM
200LFM
20
30
40
50
60
70
80
90
0
1
2
3
4
5
6
7
N at c onv
60LF M
120LF M
200LF M
Ambient Temperature (°C)
Output Current (A)
Airflow
Recommended Maximum
Operating Temperature
PT6625P, 5.0V
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
0
1
2
3
4
5
6
7
N a t c o n v
6 0 L F M
1 2 0 L F M
2 0 0 L F M
40
50
60
70
80
90
100
0
1
2
3
4
5
6
PT6621
PT6622
PT6623
PT6625
PT6626
0
5
10
15
20
25
30
0
1
2
3
4
5
6
PT6621
PT6622
PT6623
PT6625
PT6626
0
1
2
3
4
5
0
1
2
3
4
5
6
P T6621
P T6622
P T6623
P T6625
P T6626
For assistance or to order, call
(800) 531-5782
3
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
A p p l i c a t i o n
N o t e s
PT6620 Series
More Application Notes
Adjusting the Output Voltage of the
PT6620 7Amp12V Bus Converter Series
The output voltage of the Power Trends PT6650 Series ISRs
may be adjusted higher or lower than the factory trimmed pre-
set voltage with the addition of a single external resistor. Table 1
accordingly gives the allowable adjustment range for each model
in the series as V
a
(min) and V
a
(max).
Adjust Up:
An increase in the output voltage is obtained by
adding a resistor R2, between pin 14 (V
o
adjust) and pins 7-10
(GND).
Adjust Down:
Add a resistor
(R1)
, between pin 14 (V
o
adjust)
and pins 11-13 (V
out
).
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. Use only a single 1% resistor in either the
(R1)
or R2 loca-
tion. Place the resistor as close to the ISR as possible.
2. Never connect capacitors from V
o
adjust to either GND,
V
out
, or the Remote Sense pin. Any capacitance added to
the V
o
adjust pin will affect the stability of the ISR.
3. If the Remote Sense feature is being used, connecting the
resistor
(R1)
between pin 14 (V
o
adjust) and pin 1 (Remote
Sense) can benefit load regulation.
4. The minimum input voltage required by the part is V
out
+ 3,
or 9V, whichever is higher.
5. The maximum output current must be limited to the equiva-
lent of 30Watts.
i.e.
I
out
(max)
=
12
Adc,
V
a
where V
a
is the adjusted output voltage.
Figure 1
C
in
330
µ
F
+
C
out
330
µ
F
+
(R1)
Adj Down
R 2
Adjust Up
Vo
C O M
C O M
Vin
PT6620
1 1 , 1 2 , 1 3
1 4
7,8,9,10
4,5,6
Vin
V o
G N D
Vo(adj)
S T B Y
3
V s e n s e
1
L
O
A
D
The values of
(R1)
[adjust down], and R2 [adjust up], can
also be calculated using the following formulae.
R
o
(V
a
– 1.25)
(R1)
=
(V
o
– V
a
)
– R
s
k
Ω
1.25 R
o
– R
s
k
Ω
R2
=
V
a
- V
o
Where:
V
o
= Original output voltage
V
a
= Adjusted output voltage
R
o
= The resistance value in Table 1
R
s
= The series resistance from Table 1
Table 1
PT6620 ADJUSTMENT AND FORMULA PARAMETERS
Series Pt #
PT6622
PT6623
PT6621
PT6624
PT6625
PT6626
Vo (nom)
1.5V
2.5V
3.3V
3.6V
5.0V
9.0V
Va (min)
1.4V
1.9V
2.3V
2.5V
2.9V
5.2V
Va (max)
2.7V
3.7V
4.5V
4.8V
6.5V
10.0V
Ro (k
Ω
Ω
Ω
Ω
Ω
)
4.99
10.0
12.1
12.1
16.2
12.1
Rs (k
Ω
Ω
Ω
Ω
Ω
)
2.49
4.99
12.1
12.1
12.1
12.1
For assistance or to order, call
(800) 531-5782
4
A p p l i c a t i o n
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902 http://www.powertrends.com
N o t e s
PT6620 Series
Table 2
PT6620 ADJUSTMENT RESISTOR VALUES
Series Pt #
PT6622
PT6623
PT6621
PT6624
PT6625
Series Pt #
PT6625
PT6626
Current
7.5Adc
7.5Adc
7.5Adc
7.5Adc
6.0Adc
Current
6Adc
3.3Adc
V
o
(nom)
1.5Vdc
2.5Vdc
3.3Vdc
3.6Vdc
5.0Vdc
V
o
(nom)
5.0Vdc
9.0Vdc
V
a
(req’d)
V
a
(req’d)
1.4
(5.0)k
Ω
5.2
89.1k
(0.5)k
Ω
1.5
5.3
55.4k
(1.1)k
Ω
1.6
59.9k
5.4
38.5k
(1.9)k
Ω
1.7
28.7k
5.5
28.4k
(2.6)k
Ω
1.8
18.3k
5.6
21.7k
(3.4)k
Ω
1.9
13.1k
(5.8)k
Ω
5.7
16.8k
(4.2)k
Ω
2.0
10.0k
(10.0)k
Ω
5.8
13.2k
(5.1)k
Ω
2.1
7.9k
(16.3)k
Ω
5.9
10.4k
(6.1)k
Ω
2.2
6.4k
(26.7)k
Ω
6.0
8.2k
(7.1)k
Ω
2.3
5.3k
(47.5)k
Ω
(0.6)k
Ω
6.1
6.3k
(8.1)k
Ω
2.4
4.4k
(
110.0)k
Ω
(3.4)k
Ω
6.2
4.8k
(9.3)k
Ω
2.5
3.8k
(6.8)k
Ω
(1.7)k
Ω
6.3
3.5k
(10.5)k
Ω
2.6
3.2k
120.0k
(11.2)k
Ω
(4.2)k
Ω
6.4
2.4k
(11.9)k
Ω
2.7
57.5k
(17.1)k
Ω
(7.4)k
Ω
6.5
1.4k
(13.3)k
Ω
2.8
36.7k
(25.4)k
Ω
(11.3)
Ω
6.6
(14.9)k
Ω
2.9
26.3k
(37.8)k
Ω
(16.4)k
Ω
(0.6)k
Ω
6.7
(16.6)k
Ω
3.0
20.0k
(58.5)k
Ω
(23.2)k
Ω
(2.1)k
Ω
6.8
(18.4)k
Ω
3.1
15.8k
(99.8)k
Ω
(32.7)k
Ω
(3.7)
Ω
6.9
(20.5)k
Ω
3.2
12.9k
(224.0)k
Ω
(46.9)k
Ω
(5.5)k
Ω
7.0
(22.7)k
Ω
3.3
10.6k
(70.6)k
Ω
(7.4)k
Ω
7.1
(25.2)k
Ω
3.4
8.9k
139.0k
(118.0)k
Ω
(9.7)k
Ω
7.2
(27.9)k
Ω
3.5
7.5k
63.5k
(260.0)k
Ω
(12.2)k
Ω
7.3
(31.0)k
Ω
3.6
6.4k
38.3k
(15.1)k
Ω
7.4
(34.4)k
Ω
3.7
5.4k
25.7k
139.0k
(18.4)k
Ω
7.5
(38.3)k
Ω
3.8
18.2k
63.5k
(22.3)k
Ω
7.6
(42.8)k
Ω
3.9
13.1k
38.3k
(26.9)k
Ω
7.8
(53.9)k
Ω
4.0
9.5k
25.7k
(32.5)k
Ω
8.0
(69.6)k
Ω
4.1