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78ST212VC

Part # 78ST212VC
Description REGULATOR 12V 2A 3PSIP VRT
Category IC
Availability In Stock
Qty 5
Qty Price
1 - 1 $43.99362
2 - 2 $34.99493
3 - 3 $32.99522
4 + $30.66222
Manufacturer Available Qty
POWER TRENDS
Date Code: 9500
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

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
C
1
= Optional 1µF ceramic
C
2
= Required 100µF electrolytic
Pin-Out Information
Pin Function
1
V
in
2 GND
3
V
out
Ordering Information
78ST2 C
78ST212
C2
+
Vout
GNDGND
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 I
o
Over V
in
range
0.1* 2.0 A
With forced air cooling
Input Voltage Range V
in
0.1 I
o
2.0A 14.5 28 V
Output Voltage Tolerance V
o
Over V
in
range, I
o
= 2.0A
±1.0 ±2.0 %Vo
T
a
= 0°C to +55°C
Line Regulation Reg
line
Over V
in
range ±0.4 ±0.8 %V
o
Load Regulation Regload 0.1 I
o
2.0A ±0.2 ±0.4 %V
o
V
o
Ripple/Noise V
n
V
in
=17V, I
o
=2.0A, V
o
=12V 1.0 %V
o
Transient Response t
tr
50% load change 100 µSec
(with 100µF output cap) V
o
over/undershoot 3.0 %V
o
Efficiency η V
in
=17V, I
o
=2.0A 87 %
Switching Frequency ƒ
o
Over V
in
and I
o
ranges 0.95 1.0 1.05 MHz
Absolute Maximum T
a
-40 +65 °C
Operating Temperature Range
Recommended Operating T
a
Free Air Convection, (40-60LFM)
-40 +55** °C
Temperature Range at V
in
= 24V, I
o
=2A
Thermal Resistance θja Free Air Convection, (40-60LFM) 35 °C/W
Storage Temperature T
s
-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.)
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
DATA SHEETS
CHARACTERISTIC DATA
Note 1: All data listed in the above graphs, except for derating data, has been developed from actual products tested at 25°C. This data is considered typical data for the ISR.
Note 2: Thermal derating graphs are developed in free air convection cooling of 40-60 LFM. (See Thermal Application Notes.)
78ST212_ 12.0 VDC (See Note 1)
Efficiency vs Output Current
Ripple vs Output Current
Thermal Derating (T
a
) (See Note 2)
Power Dissipation vs Output Current
Efficiency (%)Ripple (mV)Iout (A)PD (Watts)
Iout (A)
Iout (A)
Iout (A)
Vin (Volts)
78ST212 Series
40
50
60
70
80
90
100
0.0 0.5 1.0 1.5 2.0
15V
18V
21V
24V
28V
Vin
0
10
20
30
40
50
60
0.0 0.5 1.0 1.5 2.0
15V
18V
21V
24V
28V
Vin
0.0
0.5
1.0
1.5
2.0
2.5
3.0
0.0 0.5 1.0 1.5 2.0
15V
18V
21V
24V
28V
Vin
0.0
0.5
1.0
1.5
2.0
14 16 18 20 22 24 26 28
85°C
60°C
70°C
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