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LM3489 데이터시트(PDF) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
부품명 LM3489
상세설명  Hysteretic PFET Buck Controller with Enable Pin
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3489 데이터시트(HTML) 2 Page - National Semiconductor (TI)

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Connection Diagram
Top View
20186909
8 Lead Plastic MSOP-8
NS package Number MUA08A
Package Marking and Ordering Information
Order Number
Package Type
Package Marking
Supplied As:
LM3489MM
MSOP-8
SKSB
1000 units on Tape and Reel
LM3489MMX
MSOP-8
SKSB
3500 units on Tape and Reel
Pin Descriptions
Pin #
Name
Description
1
ISENSE
The current sense input pin. This pin should be connected to the PFET drain
terminal directly or through a series resistor up to 600 ohm for 28V>Vin>35V.
2
GND
Signal ground.
3
EN
Enable pin. Connect EN pin to ground to shutdown the part or float to enable
operation (Internally pulled high). This pin can also be used to perform UVLO
function.
4
FB
The feedback input. Connect the FB to a resistor voltage divider between the
output and GND for an adjustable output voltage.
5
ADJ
Current limit threshold adjustment. Connected to an internal 5.5µA current source.
A resistor is connected between this pin and VIN. The voltage across this resistor
is compared with the ISENSE pin voltage to determine if an over-current condition
has occurred.
6
PGND
Power ground.
7
PGATE
Gate Drive output for the external PFET. PGATE swings between VIN and VIN-5V.
8
VIN
Power supply input pin.
www.national.com
2


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