鈥?/div>
Adjustable Output Voltage
Remote Sense (both outputs)
Standby Function
Over-Temperature Protection
Soft-Start
Internal Sequencing
23-pin SIPPackage
The PT6920 is a new series of 25W
dual output ISRs designed to power the
latest generation DSP chips. Both out-
put voltages are independently adjustable
with external resistors. In addition, the
second output voltage of the PT6921 can
be selected for 2.5V or 1.8V to accom-
modate the next generation of DSP
chips. The internal power sequencing of
both outputs meet the latest require-
ments of TI鈥檚 鈥楥6000 series DSPs.
Patent Pending*
Pin-Out Information
Pin Function
Pin
13
14
15
16
17
18
19
20
21
22
23
Ordering Information
Function
V
1out
V
1out
V
1out
V
1
Adjust
Do Not Connect
Standard Application
C 1 = Req鈥檇 560碌F electrolytic
C 2 = Req鈥檇 330碌F electrolytic
C 3 = Optional 100碌F electrolytic
1
2
3
V2 Sense
V1 Sense
V
1
Remote Sense
Do Not Connect
STBY
V
in
V
in
V
in
GND
GND
GND
GND
GND
V
1out
PT6921t
= +3.3 Volts
t
+2.5/+1.8 Volts
PT6922t
= +3.3 Volts
t
+1.5 Volts
4
5
6
7
8
9
10
11
GND
STBY
3
22
1
18-21
V
2out
V
2out
V
2out
V
2out
V
2
Remote Sense
V
2
Adjust
*
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
Horizontal Through-Hole
Horizontal Surface Mount
V2
OUT
V1
OUT
R1
V
IN
4,5,6
PT6920
7-11
16
23
12-15
R3
C1
C2
R4
R2
+
C3
+
N
A
C
GND
12
(For dimensions and PC board layout,
see Package Styles 1100 and 1110.)
Note: for PT6921 only:
with pin 23 open, V2out=2.5V
with pin 23 shorted to pin 22, V2out=1.8V
Preliminary Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
PT6920 SERIES
Symbols
I
o
Conditions
T
a
=
+60擄C, 200 LFM, pkg N
V
1
= 3.3V
V
2
= 2.5V
V
2
= 1.8V
V
2
= 1.2V
Min
0.1
0
0
0
0.1
0
0
0
4.5
V
o
-0.1
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
475
0
0
-40
鈥?/div>
Typ
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鹵7
鹵7
鹵17
鹵4
50
25
25
60
60
75
600
鈥?/div>
鈥?/div>
鈥?/div>
29
Max
5.5
2.2
1.75
1.2
6.0
2.2
1.75
1.2
5.5
V
o
+0.1
鹵17
鹵13
鹵33
鹵10
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
725
+85
+65
+125
鈥?/div>
Units
A
A
A
A
A
A
A
A
V
V
mV
mV
mV
mV
mV
mV
碌Sec
mV
mV
%
kHz
擄C
擄C
擄C
grams
T
a
=
+25擄C, natural convection V
1
= 3.3V
V
2
= 2.5V
V
2
= 1.8V
V
2
= 1.2V
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
2
= 330碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Storage Temperature
Weight
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
茠
o
T
a
T
a
T
s
鈥?/div>
0.1A
鈮?/div>
I
o
鈮?/div>
I
max
V
in
= +5V, I
o
= I
max,
both outputs
0擄C
鈮?/div>
T
a
鈮?/div>
+65擄C
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V, I
o
= I
max
V
in
= +5V, 0.1
鈮?/div>
I
o
鈮?/div>
I
max
V
in
= +5V, I
o
= I
max
V
1
= 3.3V
V
2
= 2.5V
V
1
= 3.3V
V
2
= 2.5V
V
1
= 3.3V
V
2
= 2.5V
I
o
step between 0.5xI
max
and I
max
V
o
over/undershoot
V
1
= 3.3V
V
2
= 2.5V
V
in
= +5V, I
o
= 4A total
4.5V
鈮?/div>
V
in
鈮?/div>
5.5V
0.1A
鈮?/div>
I
o
鈮?/div>
I
max
鈥?/div>
Forced airflow = 200 LFM
Over V
in and
I
o
Ranges
鈥?/div>
Vertical/Horizontal
Note:
The PT6920 series requires a 560碌F electrolytic capacitor on the input and a 330碌F electrolytic capacitor on the output for proper operation in all applications.
* This product is the subject of one or more patents. Other patents pending.
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.powertrends.com
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