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LM2621 数据表(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LM2621
功能描述  Low Input Voltage, Step-Up DC-DC Converter
PDF  10 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM2621 数据表(HTML) 4 Page - National Semiconductor (TI)

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Pin Description
Pin
Name
Function
1
PGND
Power Ground
2
EN
Active-Low Shutdown Input
3
FREQ
Frequency Adjust. An external resistor connected between this pin and Pin 6 (V
DD) sets the
switching frequency of the LM2621.
4
FB
Output Voltage Feedback
5
SGND
Signal Ground
6V
DD
Power Supply for Internal Circuitry
7
BOOT
Bootstrap Supply for the Gate Drive of Internal MOSFET Power Switch
8
SW
Drain of the Internal MOSFET Power Switch
Typical Performance Characteristics
Efficiency vs Load Current
V
OUT = 5.0V
DS100934-1
Efficiency vs Load Current
V
OUT = 3.3V
DS100934-2
V
FB vs Temperature
DS100934-3
I
OP vs Temperature
DS100934-4
I
SD vs Temperature
DS100934-5
I
SD vs VDD
DS100934-6
I
OP vs VDD
DS100934-7
V
IN_ST vs Load Current
V
OUT= 3.3V
DS100934-8
Switching Frequency vs R
FQ
DS100934-9
www.national.com
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