PT79SR100_09 Datasheet, PDF (1/8 Pages) Texas Instruments – Self-Contained Inductor

PT79SR100 Series
-1.5 Amp Negative Step-Down
Integrated Switching Regulator
• High Efficiency > 85%
• Self-Contained Inductor
• Short Circuit Protection
• Over-Temperature Protection
The PT79SR100 is a line of
Negative Input/Negative Output
3-terminal Integrated Switching
SLTS061A
(Revised 6/30/2000)
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
(T_a = 25°C unless noted)
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage Tolerance
Symbols
Io
Isc
V_in
∆V_o
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
Reg_line
Regload
Vn
ttr
Efficiency
η
Switching Frequency
ƒ_o
Absolute Maximum
Ta
Operating Temperature Range
Recommended Operating
T_a
Temperature Range
Thermal Resistance
θ_ja
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
I_o=-0.1 to -1.5 A
-0.1 ≥ Io ≥ -1.5 A
V_o=-5V
Vo=-15V
Over Vin range, I_o=-1.5 A
Ta=-20°C to shutdown
Over V_in 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 V_in and I_o 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
06 = -6.0 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
%V_o
%Vo
mVpp
µSec
%Vo
%
MHz
°C
°C
°C/W
mV/°C
°C
G’s
G’s
Grams
For technical support and more information, see inside back cover or visit www.ti.com/powertrends