78ST212 Datasheet, PDF (1/3 Pages) Texas Instruments – 12V 2 AMP POSITIVE STEP-DOWN INTEGRATED SWITCHING REGULATOR

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78ST212 Series
12V 2 AMP POSITIVE STEP-DOWN
INTEGRATED SWITCHING REGULATOR
Revised 6/30/98
• 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.
Standard Application
Vin
C1
GND
1 _78ST212 3
2
C2
Vout
+
GND
Pin-Out Information
Pin Function
1
V_in
2 GND
3
V_out
C₁ = Optional 1µF ceramic
C₂ = Required 100µF electrolytic
Specifications
Characteristics
(T_a = 25°C unless noted)
Output Current
Input Voltage Range
Output Voltage Tolerance
Line Regulation
Load Regulation
Vo Ripple/Noise
Transient Response
(with 100µF output cap)
Efficiency
Switching Frequency
Absolute Maximum
Operating Temperature Range
Recommended Operating
Temperature Range
Thermal Resistance
Storage Temperature
Mechanical Shock
Mechanical Vibration
Weight
Symbols
I_o
Vin
∆Vo
Reg_line
Regload
Vn
ttr
η
ƒo
Ta
Ta
θja
Ts
—
—
—
Conditions
Over V_in range
With forced air cooling
0.1 ≤ Io ≤ 2.0A
Over Vin range, Io= 2.0A
T_a= 0°C to +55°C
Over V_in range
0.1 ≤ Io ≤ 2.0A
Vin=17V, Io=2.0A, Vo=12V
50% load change
V_o over/undershoot
V_in=17V, I_o=2.0A
Over Vin and Io ranges
—
Free Air Convection, (40-60LFM)
at Vin= 24V, Io=2A
Free Air Convection, (40-60LFM)
—
Per Mil-STD-883D, Method 2002.3
Per Mil-STD-883D, Method 2007.2,
20-2000 Hz, Soldered in a PC board
—
*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.
Ordering Information
78ST2 XX Y C
Output Voltage
12 = 12.0 Volts
Package Suffix
V = Vertical Mount
H = Horizontal Mount
(For dimensions and PC board
layout see Package Style 600.)
78ST212 SERIES
Min
Typ
0.1*
—
14.5
—
—
±1.0
—
±0.4
—
±0.2
—
1.0
—
100
—
3.0
—
87
0.95
1.0
-40
—
-40
—
—
35
-40
—
—
500
—
10
—
11
Max
2.0
28
±2.0
±0.8
±0.4
—
—
—
—
1.05
+65
+55**
—
+125
—
—
—
Units
A
V
%Vo
%V_o
%Vo
%Vo
µSec
%V_o
%
MHz
°C
°C
°C/W
°C
G’s
G’s
Grams
Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555 [phone] Fax: [phone] http://www.powertrends.com