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LM2670SX-ADJ Arkusz danych(PDF) 3 Page - Texas Instruments

Numer części LM2670SX-ADJ
Szczegółowy opis  LM2670 SIMPLE SWITCHER짰 High Efficiency 3-A Step-Down Voltage Regulator With Sync
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
Logo TI1 - Texas Instruments

LM2670SX-ADJ Arkusz danych(HTML) 3 Page - Texas Instruments

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DAP
1
NC
14
Switch_output
2
Input
13
Switch_output
3
Input
12
Switch_output
4
CBOOST/CB
11
NC
5
NC
10
NC
6
SYNC
9
GND
7
Feedback/FB
8
ON/OFF
Not to scale
Thermal
Pad
1
Switch_output
2
Input
3
CBOOST/CB
4
GND
5
SYNC
6
Feedback/FB
7
ON/OFF
Not to scale
3
LM2670
www.ti.com
SNVS036K – APRIL 2000 – REVISED JUNE 2016
Product Folder Links: LM2670
Submit Documentation Feedback
Copyright © 2000–2016, Texas Instruments Incorporated
5 Pin Configuration and Functions
KTW Package
7-Pin TO-263
Top View
NDZ Package
7-Pin TO-220
Top View
NHM Package
14-Pin VSON
Top View
Connect DAP to pin 9 on PCB
Pin Functions
PIN
I/O
DESCRIPTION
NAME
TO-263,
TO-220
VSON
Switch output
1
12, 13, 14
O
Source pin of the internal High Side FET. This is a switching node. Attached this pin to
an inductor and the cathode of the external diode.
Input
2
2, 3
I
Supply input pin to collector pin of high side FET. Connect to power supply and input
bypass capacitors CIN. Path from VIN pin to high frequency bypass CIN and GND must
be as short as possible.
CBOOST/CB
3
4
I
Boot-strap capacitor connection for high-side driver. Connect a high-quality, 100-nF
capacitor from CB to VSW Pin.
GND
4
9
Power ground pins. Connect to system ground. Ground pins of CIN and COUT. Path to
CIN must be as short as possible.
SYNC
5
6
I
Synchronization pin. Use this pin to synchronize the frequency to an external clock.
The external frequency must be higher than the LM2670 internal oscillation frequency.
Feedback/FB
6
7
I
Feedback sense input pin. Connect to the midpoint of feedback divider to set VOUT for
ADJ version or connect this pin directly to the output capacitor for a fixed output
version.
ON/OFF
7
8
I
Enable input to the voltage regulator. High = ON and low = OFF. Pull this pin high or
float to enable the regulator.
NC
1, 5, 10, 11
No connect pins


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