1

RH1083M

7.5A Low Dropout

Positive Adjustable Regulator

DESCRIPTIO

The RH1083M positive adjustable regulator is designed to

provide 7.5A with higher efficiency than currently avail-

able devices. All internal circuitry is designed to operate

down to 1V input-to-output differential and the dropout

voltage is fully specified as a function of load current.

Dropout is guaranteed at a maximum of 1.5V at maximum

output current, decreasing at lower load currents. On-chip

trimming adjusts the output voltage to 1%. Current limit is

also trimmed, minimizing the stress on both the regulator

and power source circuitry under overload conditions.

The RH1083M is pin compatible with older 3-terminal

regulators. A 10

μFoutputcapacitorisrequiredonthisnew

device. However, this is usually included in most regulator

designs.

Unlike PNP regulators, where up to 10% of the output

current is wasted as quiescent current, the RH1083M

quiescent current flows into the load, increasing efficiency.

The wafer lots are processed to Linear Technology

Corporation’s in-house Class S flow-to-yield circuits us-

able in stringent military applications.

Since the TO-3 package on this product cannot meet the

cracked glass external visual criteria of MIL-STD-883

Method 2009, inspection for cracked glass at 100% exter-

nal visual will not be performed. Instead a 100% fine/gross

leak test will be performed just prior to shipment.

BUR -I CIRCUIT

A

G

A

U

A

R

BSOLUTEXI

TI

S

Power Dissipation .............................. Internally Limited

Input-to-Output Voltage Differential ........................ 30V

Operating Junction Temperature Range

Control Circuitry ............................ – 55

°C to 150°C

Power Transistor ........................... – 55

°C to 200°C

Storage Temperature Range ................ – 65

°C to 150°C

Lead Temperature (Soldering, 10 sec.)................ 300

°C

RH1083M

IN

OUT

ADJ

121

Ω

1k

RH1083 BI

18V

–18V

CAPACITOR(S) NOT SHOWN

2

1

CASE

IS OUTPUT

ADJ

K PACKAGE

2-LEAD TO-3 METAL CAN

(STEEL)

BOTTOM VIEW

, LTC and LT are registered trademarks of Linear Technology Corporation.

PACKAGE I FOR ATIO