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LM2621 Datasheet(PDF) 3 Page - Texas Instruments

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Part # LM2621
Description  Low Input Voltage, Step-Up DC-DC Converter
Download  17 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM2621 Datasheet(HTML) 3 Page - Texas Instruments

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SW
8
BOOT
7
VDD
6
SGND
5
PGND
EN
FREQ
FB
1
2
3
4
LM2621
www.ti.com
SNVS033D – MAY 2004 – REVISED NOVEMBER 2015
5 Pin Configuration and Functions
DGK Package
8-Pin VSSOP
Top View
Pin Functions
PIN
TYPE(1)
DESCRIPTION
NAME
NO.
PGND
1
GND
Power Ground
EN
2
I
Active-Low Shutdown Input
FREQ
3
A
Frequency Adjust. An external resistor connected between this pin and Pin 6 (VDD) sets the switching
frequency of the LM2621.
FB
4
A
Output Voltage Feedback
SGND
5
GND
Signal Ground
VDD
6
PWR
Power Supply for Internal Circuitry
BOOT
7
PWR
Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch
SW
8
PWR
Drain of the Internal MOSFET Power Switch
(1)
I = Input, O = Output, PWR = Power, GND = Ground, A = Analog
6 Specifications
6.1 Absolute Maximum Ratings
See
(1) (2)
MIN
MAX
UNIT
SW Pin Voltage
–0.5
14.5
V
BOOT, VDD, EN and FB Pins
–0.5
10
V
FREQ Pin
100
µA
Power Dissipation (TA=25°C)
(3)
500
mW
TJmax
(3)
150
°C
Lead Temp. (Soldering, 5 sec)
260
°C
Storage temperature, Tstg
–65
150
°C
(1)
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2)
If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and
specifications.
(3)
The maximum power dissipation must be derated at elevated temperatures and is dictated by Tjmax (maximum junction temperature),
θJA (junction to ambient thermal resistance), and TA (ambient temperature). The maximum allowable power dissipation at any
temperature is Pdmax = (Tjmax - TA)/ θJA or the number given in the Absolute Maximum Ratings, whichever is lower.
Copyright © 2004–2015, Texas Instruments Incorporated
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