Texas Instruments PT78HT205V, PT78HT233H, PT78HT233S, PT78HT253H, PT78HT253S Datasheet

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16

Application Notes

Mechanical Outline

Product Selector Guide

Revised 5/15/98

2 AMP POSITIVE STEP-DOWN

INTEGRATED SWITCHING REGULATOR

PT78HT200 Series

Standard Application

C1 = Optional 1µF ceramic

C2

= Required 100µF electrolytic

Pin-Out Information

Pin Function

1V

in

2 GND

3V

out

Ordering Information

PT78HT2

Output Voltage

XX

Y

33 = 3.3 Volts

05 = 5.0 Volts

53 = 5.25 Volts

65 = 6.5 Volts

Package Suffix

V = Vertical Mount

S = Surface Mount

H = Horizontal

Mount

• High Efficiency > 85%

• Wide Input Range

• Self-Contained Inductor

• Short-Circuit Protection

• Over-Temperature Protection

• Fast Transient Response

This is the new generation of the

PT78HT200 Series wide input range

3 terminal regulators. These ISRs have

a maximum output current of 2.0 Amps.

The output voltage is laser trimmed

for high accuracy.

These 78 series regulators have excel-

lent line and load regulation with internal

short-circuit and over-temperature protec-

tion, and are offered in a variety of standard

output voltages. These ISRs are very flex-

ible and may be used in a wide variety of

applications.

PT78HT200

C2

+

Vout

COMCOM

Vin

C1

1

2

3

Pkg Style 500

Specifications

Characteristics

PT78HT200 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

Short Circuit Current I

sc

V

in

= V

in

min — 6.0 — Apk

Input Voltage Range V

in

0.1 ≥ I

o

≥ 2.0A V

o

=3.3V 9 — 15 V

V

o

=5V 9 — 28 V

V

o

=6.5V 10.5 — 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 +60°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

= V

in

min, I

o

= 2.0A — ±1 — %Vo

Transient Response t

tr

50% load change — 100 — µSec

(with 100µF output cap) V

o

over/undershoot 5.0 %V

o

Efficiency η V

in

=9V, I

o

= 2.0A V

o

=5V — 80 — %

Switching Frequency ƒ

o

Over V

in

and I

o

ranges V

o

=5V, 6.5V 700 750 800 kHz

V

o

=3.3V 950 1,000 1,050 kHz

Absolute Maximum T

a

— -40 — +85 °C

Operating Temperature Range

Recommended Operating T

a

Free Air Convection, (40-60LFM)

-40 — +75** °C

Temperature Range Over V

in

and I

o

ranges

Thermal Resistance θ

ja

Free Air Convection, (40-60LFM) — 40 — °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,

—5

—

G’s

20-2000 Hz, soldered in a PC board

Weight — — — 6.5 — Grams

*ISR will operate down to no load with reduced specifications. **See Thermal Derating chart.

Note:

The PT78HT200 Series requires a 100µF electrolytic or tantalum output capacitor for proper operation in all applications.