PT78NR100 Series
1 Amp Plus to Minus Voltage
Integrated Switching Regulator
SLTS058B
(Revised 8/31/2000)
•
•
•
•
•
•
Negative output from positive input
Wide Input Range
Self-Contained Inductor
Short Circuit Protection
Over-Temperature Protection
Fast Transient Response
The PT78NR100 Series creates a
negative output voltage from a posi-
tive input voltage greater than 7V.
These easy-to-use, 3-terminal, Inte-
grated Switching Regulators (ISRs)
have maximum output power of 5
watts and a negative output voltage
that is laser trimmed. They also have
excellent line and load regulation.
Pin-Out Information
Pin
1
Ordering Information
Function
+V
i
n
-V
out
GND
PT78NR1
XX
Output Voltage
03
= -3.0 Volts
05
= -5.0 Volts
52
= -5.2 Volts
06
= -6.0 Volts
07
= -7.0 Volts
08
= -8.0 Volts
09
= -9.0 Volts
10
= -10.0 Volts
12
= -12.0 Volts
14
= -13.9 Volts
15
= -15.0 Volts
PT78NR100 SERIES
Y
Package Suffix
V
= Vertical Mount
S
= Surface Mount
H
= Horizontal
Mount
Standard Application
Vin
+
1
2
3
2
PT78NR100
3
-Vout
C1
COM
C2
+
COM
C1 = Required 100µF electrolytic
(1)
C2 = Required 100µF electrolytic
(1)
Specifications
Characteristics
(T
a
= 25°C unless noted)
Output Current
Symbols
I
o
Conditions
Pkg Style 500
Min
V
o
=-5V
V
o
=-6V
V
o
=-7, -8, -9V
V
o
=-10V
V
o
=-12V
V
o
=-13.9, -15V
0.05
(2)
0.05
(2)
0.05
(2)
0.05
(2)
0.05
(2)
0.05
(2)
—
—
—
V
o
=-5V
V
o
=-6, -7, -8, -9V
V
o
=-10, -12V
V
o
=-13.9, -15V
7
7
7
7
—
—
—
—
—
—
—
600
-40
—
-40
—
—
—
Typ
—
—
—
—
—
—
4×I
max
4
0.5
—
—
—
—
±1.0
±0.5
±0.5
±2
100
5.0
75
650
—
45
—
500
5
6.5
Max
1.00
0.8
0.55
0.5
0.40
0.30
—
—
—
25
21
18
15
±3.0
±1.0
±1.0
—
250
—
—
700
+85
(3)
—
+125
—
—
Units
Over V
in
range
A
Short Circuit Current
Inrush Current
Input Voltage Range
I
sc
I
ir
t
ir
V
in
V
in
=10V
V
in
=10V
On start-up
0.1
≤
I
o
≤
I
max
Apk
A
mSec
V
V
V
V
%V
o
%V
o
%V
o
%V
o
µSec
%V
o
%
kHz
°C
°C/W
°C
G’s
G’s
Grams
Output Voltage Tolerance
Line Regulation
Load Regulation
V
o
Ripple/Noise
Transient Response
(with 100µF output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperaturte Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
∆V
o
Reg
line
Reg
load
V
n
t
tr
η
ƒ
o
T
a
Over V
in
range
T
a
=-20°C to +70°C
Over V
in
range
0.1
≤
I
o
≤
I
max
V
in
=10V, I
o
=I
max
50% load change
V
o
over/undershoot
V
in
=10V, I
o
=0.5×I
max,
V
o
= -5V
Over V
in
and I
o
ranges
Free Air Convection, (40-60LFM)
Over V
in
Range
Free Air Convection, (40-60LFM)
—
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
—
θ
ja
T
s
—
—
—
Notes:
(1)
The PT78NR100 Series requires a 100µF electrolytic or tantalum capacitor at both the input and output for proper operation in all applications. The input
capacitor, C
1
must have a ripple current rating
≥
600 mArms, and an ESR
≤
0.2
Ω
.
(2) The ISR will operate down to no load with reduced specifications.
(3) See Thermal Derating chart.
For technical support and more information, see inside back cover or visit www.ti.com/powertrends
TI [ TEXAS INSTRUMENTS ]
