Not Recommended for New Designs
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-T
emperature Protection
Fast Transient Response
Pin-Out Information
Pin
Vin
C1
1
PT78NR100
+
3
GND
-Vout
2
C2
-Vout
3
+
COM
PT78NR1 XX
+Vin
2
Standard Application
Ordering Information
Function
1
The PT78NR100 Series creates a
negative output voltage from a positive input voltage greater than 7V.
These easy-to-use, 3-terminal, Integrated 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.
COM
C1 = Required 100µF electrolytic (1)
C2 = Required 100µF electrolytic (1)
Specifications
Pkg Style 500
Y
Output Voltage
Package Suffix
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
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
PT78NR100 SERIES
Characteristics
(Ta= 25°C unless noted)
Symbols
Conditions
Output Current
Io
Over Vin range
Min
Vo=-5V
Vo=-6V
Vo=-7, -8, -9V
Vo=-10V
Vo=-12V
Vo=-13.9, -15V
Typ
Max
Units
0.05 (2)
0.05 (2)
0.05 (2)
0.05 (2)
0.05 (2)
0.05 (2)
—
—
—
—
—
—
1.00
0.8
0.55
0.5
0.40
0.30
A
Short Circuit Current
Isc
Vin=10V
—
4×Imax
—
Apk
Inrush Current
Iir
tir
Vin=10V
On start-up
—
—
4
0.5
—
—
A
mSec
Input Voltage Range
Vin
0.1 ≤ Io ≤ Imax
7
7
7
7
—
—
—
—
25
21
18
15
V
V
V
V
Output Voltage Tolerance
∆Vo
Over Vin range
Ta=-20°C to +70°C
—
±1.0
±3.0
%Vo
Line Regulation
Regline
Over Vin range
—
±0.5
±1.0
%Vo
Load Regulation
Regload
0.1 ≤ Io ≤ Imax
—
±0.5
±1.0
%Vo
Vo Ripple/Noise
Vn
Vin=10V, Io=Imax
—
±2
—
%Vo
Transient Response
(with 100µF output cap)
ttr
50% load change
Vo over/undershoot
—
—
100
5.0
250
—
µSec
%Vo
%
Vo=-5V
Vo=-6, -7, -8, -9V
Vo=-10, -12V
Vo=-13.9, -15V
Efficiency
η
Vin=10V, Io=0.5×Imax, Vo = -5V
—
75
—
Switching Frequency
ƒo
Over Vin and Io ranges
600
650
700
kHz
Absolute Maximum
Operating Temperaturte Range
Ta
Free Air Convection, (40-60LFM)
Over Vin Range
-40
—
+85 (3)
°C
Thermal Resistance
θja
Free Air Convection, (40-60LFM)
—
45
—
°C/W
Storage Temperature
Ts
—
-40
—
+125
°C
Mechanical Shock
—
Per Mil-STD-883D, Method 2002.3
—
500
—
G’s
Mechanical Vibration
—
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
—
5
—
G’s
Weight
—
—
—
6.5
Grams
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, C1 must have a ripple current rating ≥600 mArms, and an ESR ≤0.2Ω.
(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
