LM3460-1.2, -1.5 Precision Controller for GTLp and GTL Bus Termination
May 1999
LM3460-1.2, -1.5
Precision Controller for GTLp and GTL Bus Termination
General Description
The LM3460 is a monolithic integrated circuit designed for
precision control of GTLplus and GTL Bus termination. This
controller is available in a tiny SOT23-5 package, and in-
cludes an internally compensated op amp, a bandgap refer-
ence, an NPN output transistor, and voltage setting resistors.
A trimmed precision bandgap voltage reference utilizes tem-
perature drift curvature correction for excellent voltage stabil-
ity over the operating range. The precision output control en-
ables the termination voltage to maintain tight regulation,
despite fast switching requirements on the bus.
The LM3460 controller is designed to be used with a high
current (
>
7A) NPN pass transistor to provide the high cur-
rent needed for the bus termination. The wide bandwidth of
the feedback loop provides excellent transient response,
and greatly reduces the output capacitance required, thus
reducing cost and board space requirements.
Features
n
Precision output (1%)
n
Output voltage can be adjusted
n
Extremely fast transient response in GTLp and GTL bus
termination
n
Tiny SOT23-5 package
n
Output voltage capability for GTL or GTLp
n
Low temperature coefficient
Applications
n
GTL bus termination (1.2V output 7A)
n
GTLp bus termination (1.5V output 7A)
n
Adjustable high-current linear regulator
Connection Diagram and Package Information
5-Lead Outline Package (M5)
Actual Size
DS012603-2
DS012603-1
DS012603-3
*
This resistor is not used on the LM3460-1.2.
*
No internal connection, but should be soldered to PC board for best heat
transfer.
LM3460 Functional Diagram
Top View
See NS package Number MA05B
Ordering Information
Voltage
1.5
1.5
1.2
1.2
Order Number
LM3460M5-1.5
LM3460M5X-1.5
LM3460M5-1.2
LM3460M5X-1.5
Package Marking
D06A
D06A
D09A
D09A
Supplied As
250 Unit Increments on Tape and Reel
3k Unit Increments on Tape and Reel
250 Unit Increments on Tape and Reel
3k Unit Increments on Tape and Reel
MARKING CODE:
The first letter
鈥矰鈥?/div>
identifies the part as a Driver, and the next two numbers define the voltage for the part. The fourth letter indicates the
grade, with
鈥矨鈥?/div>
designating the prime grade of product.
AVAILABILITY:
The SOT23-5 package is only available in quantity of 250 on tape and reel (designated by the letters
鈥矼5鈥?/div>
in the part number), or in quantity
of 3000 on tape and reel (indicated by the letters
鈥矼5X鈥?/div>
in the part number).
漏 1999 National Semiconductor Corporation
DS012603
www.national.com
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