PT78ST100 Datasheet, PDF (1/4 Pages) Texas Instruments – 1.5 Amp Positive Step-Down Integrated Switching Regulator

PT78ST100 Series
1.5 Amp Positive Step-Down
Integrated Switching Regulator
SLTS059A
(Revised 6/30/2000)
• Very Small Footprint
• High Efficiency > 85%
• Self-Contained Inductor
• Internal Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
• Wide Input Range
The PT78ST100 is a series of wide-
input range, 3-terminal regulators.
Standard Application
Vin
C1
COM
1 _PT78ST100 3
Vout
+
2
C2
COM
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin Function
1
V_in
2 GND
3
V_out
Specifications
Pkg Style 500
Characteristics
(T_a = 25°C unless noted)
Symbols
Conditions
Output Current
Short Circuit Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
I_o
I_sc
V_in
∆V_o
Reg_line
Reg_load
Over Vin range
Vin = Vin min
0.1 ≤ I_o ≤ 1.5A
V_o= 3.3V
V_o= 5V
V_o= 12V
Over V_in range, I_o=1.5A
T_a = 0°C to +60°C
Over V_in range
0.1 ≤ I_o ≤ 1.5A
Vo Ripple/Noise
V_n
Transient Response
t_tr
(with 100µF output cap)
Efficiency
η
Switching Frequency
ƒ_o
Absolute Maximum
T_a
Operating Temperature Range
V_in= 9V, I_o= 1.5A
V_in= 16V, I_o= 1.5A
V_o= 5V
V_o= 12V
50% load change
V_o over/undershoot
V_in= 10V, I_o= 1A
V_in= 10V, I_o= 1A
V_in= 17V, I_o= 1A
V_o= 3.3V
V_o= 5V
V_o= 12V
Over V_in range, I_o=1.5A
—
Recommended Operating
T_a
Temperature Range
Thermal Resistance
θ_ja
Storage Temperature
T_s
Mechanical Shock
—
Free Air Convection, (40-60LFM)
At Vin= 24V, Io=1.0A
Free Air Convection, (40-60LFM)
—
Per Mil-STD-883D, Method 2002.3
Mechanical Vibration
—
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, soldered in a PC board
Weight
—
—
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The PT78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
These ISRs have a maximum output current
of 1.5 Amps and an output voltage that is laser
trimmed to a variety of industry standard volt-
ages.
These 78 series regulators have excel-
lent line and load regulation with internal
short- circuit and over-temperature protec-
tion, and are offered in a variety of standard
output voltages. These ISRs are very flex-
ible and may be used in a wide variety of
applications.
Ordering Information
PT78ST1 XX Y
Output Voltage
33 = 3.3 Volts
36 = 3.6 Volts
05 = 5.0 Volts
51 = 5.1 Volts
53 = 5.25 Volts
06 = 6.0 Volts
65 = 6.5 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
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
PT78ST100 SERIES
Min
Typ
0.1*
—
—
3.5
9
—
9
—
16
—
—
±1.0
—
±0.2
—
±0.1
—
65
90
—
100
—
5
—
80
—
85
—
90
600
650
-40
—
-40
—
—
45
-40
—
—
500
—
5
—
6.5
Max
1.5
—
26
38
38
±2.0
±0.4
±0.2
—
—
—
—
—
—
700
+85
+80**
—
+125
—
—
—
Units
A
Apk
V
V
V
%Vo
%Vo
%Vo
mVpp
mVpp
µSec
%Vo
%
%
%
kHz
°C
°C
°C/W
°C
G’s
G’s
grams
For technical support and more information, see inside back cover or visit www.ti.com/powertrends