鈥?/div>
Adjustable Output Voltage
Remote Sense (both outputs)
Standby Function
Over-T
emperature Protection
Soft-Start
Internal Sequencing
23-pin SIPPackage
The PT6920 is a series of 25W
dual output ISRs that were purposely
designed to power the latest genera-
tion DSP chips. Both output voltages
are independently adjustable, allowing
either output voltages to be changed
to accomodate a DSP upgrade. The
internal power sequencing of both
outputs meet the requirements of TI鈥檚
鈥楥6000 series DSPs.
Patent Pending*
Pin-Out Information
Standard Application
C 1 = Req鈥檇 560碌F electrolytic
(1)
C 2 = Req鈥檇 330碌F electrolytic
(1)
C 3 = Optional 100碌F electrolytic
Ordering Information
Pin
13
14
15
16
17
18
19
20
21
22
23
Pin Function
1
V2 Sense
V1 Sense
Function
V
1out
V
1out
V
1out
V
1
Adjust
Do Not Connect
V
1
Remote Sense
Do Not Connect
2
3
4
5
6
7
8
9
GND
STBY
V
in
V
in
V
in
GND
GND
GND
GND
GND
V
1out
PT6921J
= +3.3 Volts
J
+2.5/+1.8 Volts
PT6922J
= +3.3 Volts
J
+1.5 Volts
STBY
3
22
1
18-21
V2
OUT
V1
OUT
R1
V
IN
4,5,6
PT6920
7-11
16
23
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
N
Horizontal Through-Hole
A
Horizontal Surface Mount
C
12-15
R3
C1
C2
R4
R2
+
C3
+
GND
10
11
12
Note:
for PT6921 only:
with pin 23 open, V2out=2.5V
with pin 23 shorted to pin 22, V2out=1.8V
(For dimensions and PC board layout,
see Package Styles 1100 and 1110.)
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
鈥?0
-40
鈥?/div>
(4)
(2)
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>
29
Max
5.5
(3)
2.2
(3)
1.75
(3)
1.2
(3)
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
(5)
+125
鈥?/div>
Units
A
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 T
olerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
2
= 330碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating T
emperature Range
Storage T
emperature
Weight
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
茠
o
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
A
V
V
mV
mV
mV
碌Sec
mV
%
kHz
擄C
擄C
grams
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
Over V
in
Range
鈥?/div>
Vertical/Horizontal
Notes:
(1)
(2)
(3)
(4)
(5)
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.
I
o
min current of 0.1A can be divided btween both outputs; V
1
, or V
2
. The ISR will operate down to no-load with reduced specifications.
I
o
max listed for each output assumes the maximum current drawn simultaneously on both outputs. Consult the factory for the absolute maximum.
For operating temperatures below 0擄C, use tantalum type capacitors on both the input and output.
See Safe Operating Area curves for appropriate derating.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
next
標(biāo)準(zhǔn)包裝 8
類別 電源 - 板載
家庭 DC DC Converters
系列 PT6920
類型 非隔離（POL）
輸出數(shù) 2
電壓 - 輸入（最?。?/label>4.5V
電壓 - 輸入（最大） 5.5V
Voltage - Output 1 3.3V
Voltage - Output 2 1.5V
Voltage - Output 3 -
電流 - 輸出（最大） 6A，1.2A
電源（瓦） - 制造商系列 25W
電壓 - 隔離 -
特點 -
安裝類型 表面貼裝
封裝/外殼 23-SIP SMD 模塊
尺寸/尺寸 -
包裝 托盤
工作溫度 -40°C ~ 85°C
效率 75%
電源（瓦特）- 最大 25W
型號
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描述
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