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参数资料
| 型号： | LM3351MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 275 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | WAFER |
| 文件页数： | 6/11页 |
| 文件大小： | 316K |
| 代理商： | LM3351MWC |
Typical Performance Characteristics (Continued)
Pin Description
Pin
Name
Function
1
Cap1+
Positive terminal for the first charge
pump capacitor.
2
Cap1
Negative terminal for the first charge
pump capacitor.
3
Cap2+
Positive terminal for the second charge
pump capacitor.
4
Cap2
Negative terminal for the second charge
pump capacitor.
5V
low
In Step-Up mode, this will be the input
terminal. In Step-Down mode, this will
be the output terminal.
6
Gnd
Ground
7V
high
In Step-Down mode, this will be the
input terminal. In Step-Up mode, this
will be the output terminal.
8
Enable
Active high CMOS logic level Enable
Input. Connect to Voltage Input terminal
to enable the IC. Connect to Ground
(Pin 6) to disable.
Detailed Operation
OPERATING PRINCIPLE
The LM3351 is a charge-pump voltage converter that pro-
vides a voltage conversion ratio of 3/2 in step-up mode and
a conversion ratio of 2/3 in the step-down mode. Thus it can
be used in the step-down mode to provide a 3.3V output
from a regulated 5V input or in the step-up mode to provide
a 5V output from a regulated 3.3V input. Other values of in-
put voltages can be used as long as they are within the lim-
its.
The LM3351 contains an array of CMOS switches which are
operated in a certain sequence to provide the step-up or
step-down of the input supply. An internal RC oscillator pro-
vides the timing signals.
Energy transfer and storage are provided by four inexpen-
sive ceramic capacitors. The selection of these capacitors is
explained in the Capacitor Selection section under Applica-
tion Information.
V
out vs Iload (Step-Down)
DS100146-7
Pη vs Iload (Step-Down)
DS100146-8
Output Source Impedance vs
Temperature (Step-Down)
DS100146-9
Switching Frequency vs
Temperature
DS100146-10
LM3351
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