12V 2 AMP POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

78ST212

Series

Standard Application

Pin-Out Information

Pin

Function

1

2

GND

3

Ordering Information

78ST2

C

78ST212

C2

+

Vout

GND

GND

Vin

C1

1

2

3

Applications with Airflow

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

Symbols

Conditions

Min

Typ

Max

Units

Output Current

0.1*

—

2.0

A

With forced air cooling

Input Voltage Range

0.1

14.5

—

28

V

Output Voltage Tolerance

—

±1.0

±2.0

%Vo

Line Regulation

—

±0.4

±0.8

Load Regulation

0.1

—

±0.2

±0.4

—

1.0

—

Transient Response

50% load change

—

100

—

µSec

(with 100µF output cap)

—

3.0

—

Efficiency

η

—

87

—

%

Switching Frequency

0.95

1.0

1.05

MHz

Absolute Maximum

—

-40

—

+65

°C

Operating Temperature Range

Recommended Operating

Free Air Convection, (40-60LFM)

-40

—

+55**

°C

Temperature Range

Thermal Resistance

Free Air Convection, (40-60LFM)

—

35

—

°C/W

Storage Temperature

—

-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.)