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78ST212 Datasheet(PDF) 1 Page - Texas Instruments

Part No. 78ST212
Description  12V 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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78ST212 Datasheet(HTML) 1 Page - Texas Instruments

   
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For assistance or to order, call (800) 531-5782
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 (800) 531-5782 Fax: (630) 393-6902 http://www.powertrends.com
12V 2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
78ST212
Series
Standard Application
C1 = Optional 1µF ceramic
C2 = Required 100µF electrolytic
Pin-Out Information
Pin
Function
1
Vin
2
GND
3
Vout
Ordering Information
78ST2
C
78ST212
C2
+
Vout
GND
GND
Vin
C1
1
2
3
High Efficiency > 87%
Wide Input Range
Aluminum Heatsink for
Applications with Airflow
Self-Contained Inductor
Short Circuit Protection
Over-Temperature Protection
The 78ST212 is a series of wide
input voltage, 3-terminal Integrated
Switching Regulators (ISRs). With a
surge capability of 3A and an output
voltage that is laser trimmed, it is ideal
for inductive load applications such as
disk drive motors.
XX
Y
Output Voltage
12
= 12.0 Volts
Package Suffix
V
= Vertical Mount
H
= Horizontal Mount
Specifications
Characteristics
78ST212 SERIES
(T
a = 25°C unless noted)
Symbols
Conditions
Min
Typ
Max
Units
Output Current
Io
Over Vin range
0.1*
2.0
A
With forced air cooling
Input Voltage Range
Vin
0.1
≤ Io ≤ 2.0A
14.5
28
V
Output Voltage Tolerance
∆Vo
Over Vin range, Io= 2.0A
±1.0
±2.0
%Vo
Ta= 0°C to +55°C
Line Regulation
Regline
Over Vin range
±0.4
±0.8
%Vo
Load Regulation
Regload
0.1
≤ Io ≤ 2.0A
±0.2
±0.4
%Vo
Vo Ripple/Noise
Vn
Vin=17V, Io=2.0A, Vo=12V
1.0
%Vo
Transient Response
ttr
50% load change
100
µSec
(with 100µF output cap)
Vo over/undershoot
3.0
%Vo
Efficiency
η
Vin=17V, Io=2.0A
87
%
Switching Frequency
ƒo
Over Vin and Io ranges
0.95
1.0
1.05
MHz
Absolute Maximum
Ta
-40
+65
°C
Operating Temperature Range
Recommended Operating
Ta
Free Air Convection, (40-60LFM)
-40
+55**
°C
Temperature Range
at Vin= 24V, Io=2A
Thermal Resistance
θja
Free Air Convection, (40-60LFM)
35
°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,
—10
G’s
20-2000 Hz, Soldered in a PC board
Weight
11
Grams
*ISR will operate down to no load with reduced specifications.
**See Thermal Derating chart.
Note: The 78ST212 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.
Revised 6/30/98
(For dimensions and PC board
layout see Package Style 600.)


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