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LM2671 Datasheet(PDF) 3 Page - Texas Instruments

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Part No. LM2671
Description  LM2671 SIMPLE SWITCHER짰 Power Converter High Efficiency 500-mA Step-Down Voltage Regulator With Features
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2671 Datasheet(HTML) 3 Page - Texas Instruments

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DAP
1
CB
VSW
2
NC
VSW
3
NC
VIN
4
SS
NC
5
NC
GND
6
SYNC
GND
7
NC
NC
8
FB
ON/OFF
16
15
14
13
12
11
10
9
Not to scale
1
CB
8
VSW
2
SS
7
VIN
3
SYNC
6
GND
4
FB
5
ON/OFF
3
LM2671
www.ti.com
SNVS008L – SEPTEMBER 1998 – REVISED JUNE 2016
Product Folder Links: LM2671
Submit Documentation Feedback
Copyright © 1998–2016, Texas Instruments Incorporated
5 Description (continued)
Other features include a ensured ±1.5% tolerance on output voltage within specified input voltages and output
load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50-μA
standby current. The output switch includes current limiting, as well as thermal shutdown for full protection under
fault conditions.
6 Pin Configuration and Functions
D or P Package
8-Pin SOIC or PDIP
Top View
NHN Package
16-Pin WSON
Top View
Connect DAP to pin 11 and 12
Pin Functions
PIN
I/O
DESCRIPTION
NAME
SOIC, PDIP
WSON
CB
1
1
I
Bootstrap capacitor connection for high-side driver. Connect a high-quality,
100-nF capacitor from CB to VSW Pin.
SS
2
4
I
Soft-start Pin. Connect a capacitor from this pin to GND to control the output
voltage ramp. If the feature not desired, the pin can be left floating.
SYNC
3
6
I
This input allows control of the switching clock frequency. If left open-circuited
the regulator is switched at the internal oscillator frequency, typically 260 kHz.
FB
4
8
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
5
9
I
Enable input to the voltage regulator. High = ON and low = OFF. Pull this pin
high or float to enable the regulator
VSW
8
15, 16
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.
GND
6
11, 12
Power ground pins. Connect to system ground. Ground pins of CIN and COUT.
Path to CIN must be as short as possible.
VIN
7
14
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.
NC
2, 3, 5, 7,
10, 13
No connect pins


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