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PT79SR112T View Datasheet(PDF) - Texas Instruments

Part NamePT79SR112T TI
Texas Instruments TI
Description-1.5 AMP NEGATIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR
PT79SR112T Datasheet PDF : 3 Pages
1 2 3
For assistance or to order, call (800) 531-5782
PT79SR100 S e r i e s
-1.5 AMP NEGATIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Application Notes
Mechanical Outline
Product Selector Guide
Revised 5/15/98
High Efficiency > 85%
Self-Contained Inductor
Short Circuit Protection
Over-Temperature Protection
The PT79SR100 Series is a new
line of Negative Input/Negative Out-
put 3-terminal Integrated Switching
Regulators (ISRs). These ISRs have a
maximum output current of -1.5 Amps
and an output voltage that is laser
trimmed to most industry standard volt-
ages. They have excellent line and load
regulation, and are ideal for applications,
such as RS232 and Ethernet communica-
tions, ECL logic, and op-amp circuitry.
Standard Application
COM
Pin-Out Information
COM
Pin Function
1 GND
2
-Vin
3
-Vout
C1
-Vin
1
D1
2 PT79SR1 3
C2
-Vout
C1 = Optional ceramic (1µF)
C2 = Optional ceramic (1-5µF)
D1 = Zener diode required to clamp
turn-on overshoot
(See Application Note)
Specifications
Characteristics
(Ta = 25°C unless noted)
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage Tolerance
Symbols
Io
Isc
Vin
Vo
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
Regline
Regload
Vn
ttr
Efficiency
η
Switching Frequency
ƒo
Absolute Maximum
Ta
Operating Temperature Range
Recommended Operating
Ta
Temperature Range
Thermal Resistance
θja
Temperature Coefficient
Tc
Storage Temperature
Ts
Mechanical Shock
Mechanical Vibration
Weight
* ISR will operate down to no load with reduced specifications.
Pkg Style 500
Conditions
Over Vin range
Vin=Vo-4V
Io=-0.1 to -1.5 A
-0.1 Io -1.5 A
Vo=-5V
Vo=-15V
Over Vin range, Io=-1.5 A
Ta=-20°C to shutdown
Over Vin range
-0.1 Io -1.5 A
Vin=-15V, Io=-1.0 A,Vo=-5V
50% load change
Vo=overshoot/undershoot
Vin=-10V, Io=-1.0A, Vo=-5V
Over Vin and Io ranges
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
Free Air Convection, (40-60LFM)
Over Vin and Io ranges
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
** See Thermal Derating chart.
Ordering Information
PT79SR1 XX Y
Output Voltage
05 = -5.0 Volts
52 = -5.2 Volts
08 = -8.0 Volts
09 = -9.0 Volts
12 = -12.0 Volts
15 = -15.0 Volts
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
PT79SR100 SERIES
Min
Typ
-0.1*
-3.5
-9
-19
±1.0
±1.0
±0.5
35
100
30
85
0.95
1.0
-40
-40
45
±0.5
-40
500
5
7.0
Max
-1.5
-30
-30
±3.0
±2.0
±1.0
1.05
+85
+60**
±1.5
+125
Units
A
Apk
V
V
%Vo
%Vo
%Vo
mVpp
µSec
%Vo
%
MHz
°C
°C
°C/W
mV/°C
°C
G’s
G’s
Grams
22
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
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