鈥?/div>
Low Voltage Input (7V)
85% Efficiency
Internal Short-Circuit Protection
Over-T
emperature Protection
Laser-Trimmed Output Voltage
The PT5120 series is a low voltage in-
put (typically 7V) version of Power
Trends鈥?easy-to-use, 1A positive step-
down, 3-terminal Integrated Switching
Regulators (ISRs). These ISRs are de-
signed with premium low-threshold
FETs for those power regulation appli-
cations requiring very low input/output
voltage differentials such as battery
powered equipment.
Pin-Out Information
Pin
1
2
3
3
Ordering Information
PT5121!
= + 5 Volts
PT5123!
= + 3.3 Volts
PT Series Suffix
(PT1234X)
Case/Pin
Configuration
Vertical Through-Hole
Horizontal Through-Hole
Horizontal Surface Mount
Function
V
in
GND
V
out
Standard Application
Vin
1
N
A
C
PT5120
2
Vout
+
GND
Pkg Style 100
PT5120
C1
GND
C2
C
1
= Optional 1碌F ceramic
C
2
= Required 100碌F electrolytic
Specifications
Characteristics
(T
a
=25擄C unless noted)
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage T
olerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
with C
o
= 100碌F
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
PT5120 SERIES
Symbols
I
o
I
sc
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
V
os
畏
茠
o
T
a
T
a
Free Air Convection,
(40-60LFM)
Free Air Convection
(40-60LFM)
V
o
= 3.3V
V
o
= 5V
V
o
= 3.3V
V
o
= 5V
Conditions
Over V
in
range
V
in
= V
in
min
0.1
鈮?/div>
I
o
鈮?/div>
1.0 A
V
o
= 3.3V
V
o
= 5V
Min
0.1*
鈥?/div>
7
7
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
575
500
-20
-20
-20
鈥?/div>
鈥?/div>
-40
Per Mil-STD-883D, Method 2002.3
1 msec, Half Sine, mounted to a fixture
Per Mil-STD-883D, Method 2007.2
20-2000 Hz, Soldered in a PC board
鈥?/div>
鈥?/div>
鈥?/div>
Typ
鈥?/div>
3.5
鈥?/div>
鹵1.5
鹵0.5
鹵0.5
鹵2
100
5.0
82
85
725
650
鈥?/div>
鈥?/div>
鈥?/div>
45
50
鈥?/div>
500
5
4.5
Max
1.0
鈥?/div>
26
38
鹵3.0
鹵1.0
鹵1.0
鈥?/div>
200
鈥?/div>
鈥?/div>
鈥?/div>
875
800
+85
+80**
+80**
鈥?/div>
鈥?/div>
+125
鈥?/div>
鈥?/div>
鈥?/div>
Units
A
Apk
V
V
%V
o
%V
o
%V
o
%V
o
碌Sec
%V
o
%
%
kHz
擄C
擄C
擄C/W
擄C
G鈥檚
G鈥檚
grams
Over V
in
Range, I
o
= 1.0 A
T
a
= 0擄C to +60擄C
Over V
in
range
0.1
鈮?/div>
I
o
鈮?/div>
1.0 A
V
in
=V
in
min, I
o
=1.0 A
25% load change
V
o
over/undershoot
V
in
=9V, I
o
=0.5A, V
o
=3.3V
V
in
=9V, I
o
=0.5A, V
o
=5V
Over V
in
and I
o
ranges, V
o
= 3.3V
V
o
= >5V
胃
ja
T
s
* ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note:
The PT5120 Series requires a 100碌F electrolytic or tantalum output capacitor for proper operation in all applications.
2
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.ti.com/powertrends
PT5121C 產(chǎn)品屬性
35
電源 - 板載
DC DC Converters
PT5120
非隔離（POL）
1
38V
5V
-
-
1A
5W
*
*
表面貼裝
3-SIP SMD 模塊
-
托盤
-20°C ~ 85°C
85%
5W
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