鈥?/div>
Series
2.0 AMP NEGATIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
SLTS079
(Revised 5/31/2000)
High Efficiency
Self-Contained Inductor
Short Circuit Protection
Over-T
emperature Protection
The PT79ST2 Series are
Negative 3-terminal Integrated
Switching Regulators (ISR).
These ISRs have a maximum
output current of 鈥?.0 Amps and
an output voltage that is laser
trimmed. They have excellent
line and load regulation with
internal short circuit and over-
temperature protection. With
high conversion efficiency,
these ISRs can power a diver-
sity of circuits used in a wide
variety of industrial applica-
tions.
Standard Application
COM
COM
Pin-Out Information
Pin
1
+
Ordering Information
Function
GND
鈥揤
in
鈥揤
out
PT79ST2
XX
Output Voltage
53
= 鈥?.13 Volts
Y
Package Suffix
V
= Vertical Mount
C
1
1
C
2
2
C
3
V
out
2
3
V
in
PT79ST2
3
(For dimensions and PC board
layout, see Package Style 500)
C1 = Optional ceramic (1碌F)
C2 = Required Electrolytic (100碌F)
C3 = Optional ceramic (1鈥?碌F)
Specifications
Characteristics
(T
a
= 25擄C unless noted)
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
(with req鈥檇 output capacitor)
Efficiency
Switching Frequency
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
PT79ST2 SERIES
Symbols
I
o
I
sc
V
in
鈭哣
o
Reg
line
Reg
load
V
n
t
tr
畏
Conditions
Over V
in
range
V
in
=V
o
鈥?V
鈥?.1
鈮?/div>
I
o
鈮?/div>
鈥?.0 Amp,
V
o
= 鈥?.13V
Min
鈥?.1*
鈥?/div>
鈥?
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
600
0
鈥?/div>
-40
鈥?/div>
鈥?/div>
鈥?/div>
Typ
鈥?/div>
鈥?.5
鈥?/div>
鹵1.0
40
30
70
100
5
85
650
鈥?/div>
45
鈥?/div>
500
5
7.0
Max
鈥?.0
鈥?/div>
鈥?0
鹵3.0
75
50
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
700
+65
鈥?/div>
+125
鈥?/div>
鈥?/div>
鈥?/div>
Units
A
Apk
V
%V
o
mV
mV
mV
pp
碌Sec
%V
o
%
kHz
擄C
擄C/W
擄C
G鈥檚
G鈥檚
Grams
Over Vin range, I
o
= 鈥?.0 Amp
T
a
= 0擄C to shutdown
Over V
in
range
鈥?.1
鈮?/div>
I
o
鈮?/div>
鈥?.0 Amp
V
in
= 鈥?V, I
o
= 鈥?.0 A,V
o
= 鈥?.13V
50% load change
V
o
=over/undershoot
V
in
= 鈥?0V, I
o
= 鈥?.0 A,V
o
= 鈥?.13V
Over V
in
range, I
o
= 鈥?.0A
Free Air Convection, (40-60LFM)
Over V
in
and I
o
ranges
Free Air Convection, (40-60LFM)
鈥?/div>
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
鈥?/div>
茠
o
T
a
胃
ja
T
s
鈥?/div>
鈥?/div>
鈥?/div>
* ISR will operate down to no load with reduced specifications.
Power Trends, Inc.
27715 Diehl Road, Warrenville, IL 60555
(800) 531-5782
Fax: (630) 393-6902
http://www.ti.com/powertrends
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