78ST105 Datasheet, PDF (1/5 Pages) Texas Instruments – 1.5 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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78ST100 Series
1.5 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
Standard Application
Vin
C1
GND
1 _78ST100 3
Vout
+
2
C2
GND
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
• Very Small Footprint
• High Efficiency > 85%
• Self-Contained Inductor
• Internal Short-Circuit Protection
• Over-Temperature Protection
• Fast Transient Response
• Wide Input Range
Pin-Out Information
Pin Function
1
V_in
2 GND
3
V_out
The 78ST100 is a series of wide input
voltage, 3-terminal Integrated Switching
Regulators (ISRs). These ISRs have a maxi-
mum output current of 1.5A and an output
voltage that is laser trimmed to a variety of
industry standard voltages.
These 78 series regulators have excellent
line and load regulation with internal short-
circuit and over-temperature protection, are
very flexible, and may be used in a wide
variety of applications.
Ordering Information
78ST1 XX Y C
Output Voltage
33 = 3.3 Volts
36 = 3.6 Volts
05 = 5.0 Volts
51 = 5.1 Volts
65 = 6.5 Volts
07 = 7.0 Volts
08 = 8.0 Volts
09 = 9.0 Volts
12 = 12.0 Volts
Package Suffix
V = Vertical Mount
S = Surface Mount
H = Horizontal
Mount
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
V_in = V_in 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 V_in= 24V, I_o=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 78ST100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
78ST100 SERIES
Min
Typ
0.1*
—
—
3.5
7
—
7
—
14.5
—
—
±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
30
30
±2.0
±0.4
±0.2
—
—
—
—
—
—
700
+85
+80**
—
+125
—
—
—
Units
A
Apk
V
V
V
%Vo
%Vo
%Vo
mVpp
mV_pp
µSec
%Vo
%
%
%
kHz
°C
°C
°C/W
°C
G’s
G’s
grams
2
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