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LM2695MHX Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
No. de pieza LM2695MHX
Descripción Electrónicos  High Voltage (30V, 1.25A) Step Down Switching Regulator
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2695MHX Datasheet(HTML) 3 Page - National Semiconductor (TI)

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Pin Descriptions
Pin Number
Name
Description
Application Information
LLP-10
TSSOP-14
1
2
SW
Switching Node
Internally connected to the buck switch source.
Connect to the inductor, free-wheeling diode, and
bootstrap capacitor.
2
3
BST
Boost pin for bootstrap capacitor
Connect a 0.022 µF capacitor from SW to this pin.
The capacitor is charged from V
CC via an internal
diode during each off-time.
34
I
SEN
Current sense
The re-circulating current flows through the internal
sense resistor, and out of this pin to the
free-wheeling diode. Current limit is nominally set at
1.25A.
45
S
GND
Sense Ground
Re-circulating current flows into this pin to the
current sense resistor.
5
6
RTN
Circuit Ground
Ground for all internal circuitry other than the current
limit detection.
6
9
FB
Feedback input from the
regulated output
Internally connected to the regulation and
over-voltage comparators. The regulation level is
2.5V.
7
10
SS
Softstart
An internal 12.3 µA current source charges an
external capacitor to 2.5V, providing the softstart
function.
811
R
ON/SD
On-time control and shutdown
An external resistor from V
IN to this pin sets the
buck switch on-time. Grounding this pin shuts down
the regulator.
912
V
CC
Output from the startup regulator
Nominally regulates at 7.0V. An external voltage
(8V-14V) can be applied to this pin to reduce
internal dissipation. An internal diode connects V
CC
to V
IN.
10
13
V
IN
Input supply voltage
Nominal input range is 8.0V to 30V.
1,7,8,14
NC
No connection.
No internal connection.
EP
Exposed Pad
Exposed metal pad on the underside of the device.
It is recommended to connect this pad to the PC
board ground plane to aid in heat dissipation.
www.national.com
3


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