Texas Instruments PT5109N, PT5110A, PT5110C, PT5110N, PT5101S Datasheet

	For assistance or to order, call [phone]	Application Notes
		Mechanical Outline

P T 5 1 0 0	S e r i e s		Product Selector Guide
		1 AMP POSITIVE STEP-DOWN	Revised 5/15/98
		INTEGRATED SWITCHING REGULATOR

•85% Efficiency

•Internal Short-Circuit Protection

•Pin-Compatible with 3-Terminal Linear Regulators

•Laser-Trimmed Output Voltage

•Over-Temperature Protection

•Small Footprint

•Wide Input Range

The PT5100 Series is Power Trends’ line of economical, easy-to-

use, 1 Amp positive step-down, 3-ter- minal Integrated Switching Regulators (ISRs) designed for pin compatibility with linear regulators. These ISRs can be used in a wide variety of on-board power regulation applications including computer, data storage, industrial controls, medical, and battery powered equipment. The series of ISRs has excellent line and load regulation and laser-trimmed output voltage.

Pin-Out Information

Ordering Information

PT Series Suffix (PT1234X)

Pin

Function

PT5101¨ = + 5 Volts

Case/Pin

1

Vin

PT5102¨ = + 12 Volts

Configuration

N

Standard Application

2

GND

PT5103¨ = + 3.3 Volts

Vertical Through-Hole

PT5105¨ = + 6.5 Volts

Horizontal Through-Hole

A

3

Vout

PT5107¨ = + 15 Volts

Horizontal Surface Mount

C

Vin

Vout

1

PT5100

3

Pkg Style 100

PT5109¨ = + 5.6 Volts

PT5110¨ = + 9 Volts

+

C1

C2

PT5111¨ = + 10 Volts

2

COM

COM

PT5112¨ = + 8 Volts

C1 = Optional 1µF ceramic

C2 = Required 100µF electrolytic

Specifications

Characteristics

PT5100 SERIES

(Ta =25°C unless noted)

Symbols

Conditions

Min

Typ

Max

Units

Output Current

Io

Over Vin range

0.1*

—

1.0

A

Short Circuit Current

Isc

Vin = Vin min

—

3.5

—

Apk

Input Voltage Range

Vin

0.1 ≤ Io ≤ 1.0 A

Vo = 3.3V

9

—

26

V

Vo = 5V

9

38

V

Vo = 12V

16

38

V

Vo = 15V

19

38

V

Output Voltage Tolerance

Vo

Over Vin Range, Io = 1.0 A

—

±1.5

±3.0

%Vo

Ta = 0°C to +60°C

Line Regulation

Regline

Over Vin range

—

±0.5

±1.0

%Vo

Load Regulation

Regload

0.1 ≤ Io ≤ 1.0 A

—

±0.5

±1.0

%Vo

Vo Ripple/Noise

Vn

Vin=Vin min, Io=1.0 A

—

±2

—

%Vo

Transient Response

ttr

25% load change

—

100

200

µSec

with Co = 100µF

Vos

Vo over/undershoot

—

5.0

—

%Vo

Efficiency

η

Vin=9V, Io=0.5A, Vo=3.3V

—

82

—

%

Vin=9V, Io=0.5A, Vo=5V

—

85

—

%

Vin=16V, Io=0.5A, Vo=12V

—

90

—

%

Vin=19V, Io=0.5A, Vo=15V

—

92

—

%

Switching Frequency

ƒo

Over Vin and Io ranges, Vo= 3.3V

575

725

875

kHz

Vo = >5V

500

650

800

Absolute Maximum

Ta

-20

—

+85

°C

Operating Temperature Range

Recommended Operating

Ta

Free Air Convection,

Vo= 3.3V

-20

—

+80**

°C

Temperature Range

(40-60LFM)

Vo= 5V

-20

—

+80**

At Vin= 24V, Io=0.75A

Vo= 12V

-20

—

+80**

Thermal Resistance

θja

Free Air Convection

Vo = 3.3V

—

45

—

°C/W

(40-60LFM)

Vo = 5V

—

50

—

Vo = 12V/15V

—

60

—

Storage Temperature

Ts

-40

—

+125

°C

Mechanical Shock

Per Mil-STD-883D, Method 2002.3

—

500

—

G’s

1 msec, Half Sine, mounted to a fixture

Mechanical Vibration

Per Mil-STD-883D, Method 2007.2

—

5

—

G’s

20-2000 Hz, Soldered in a PC board

Weight

—

4.5

—

grams

* ISR will operate down to no load with reduced specifications.

**See Thermal Derating chart.

Note: The PT5100 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.

4	Power Trends, Inc. 27715 Diehl Road, Warrenville, IL 60555	[phone] Fax: [phone] http://www.powertrends.com