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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： | 5/11页 |
| 文件大小： | 316K |
| 代理商： | LM3351MWC |
Electrical Characteristics
2/3 Step-Down Voltage Converter (Continued)
Specifications in standard type face are for T
j = 25C, and those with boldface type apply over full operating temperature
range. Unless otherwise specified, V
high = 5V, VEnable = 5V, Iload = 50 mA, C1,C2,Cin and Cout = 1 F.
Symbol
Parameter
Conditions
Typ (Note 4)
Limits (Note 5)
Units
I
Q2
Quiescent Current
Normal Mode, I
Ioad = 0A; Current into
pin V
high
0.8
mA
1.0
mA(Max)
Z
out
Output Source
Impedance
I
load =50mA
1.8
3
(Max)
f
SW
Switching
Frequency
(Note 6)
200
kHz
125
kHz(Min)
275
kHz(Max)
V
Enable
Enable Threshold
Voltage
1.7
V
1.0
V(Min)
2.5
V(Max)
I
Enable
Leakage Current
Current into ENABLE pin; ENABLE =
5V and all other pins at ground
0.025
A
1
A(Max)
Pη
Power Efficiency
95
%
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Operating ratings indicate conditions for which the device is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see Electrical Characteristics. The guar-
anteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 2: For operation at elevated temperatures, LM3351 must be derated based on package thermal resistance of
θja and Tj max, Tj =TA+ θjaPD.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5 kW resistor into each pin.
Note 4: Typical numbers are at 25C and represent the most likely parametric norm.
Note 5: Limits are 100% production tested at 25C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Averaging Outgoing Quality Level (AOQL).
Note 6: The internal oscillator runs at 1.6 MHz, the output switches operate at one eighth of the oscillator frequency, fOSC = 8fSW.
Typical Performance Characteristics
V
out vs Iload (Step-Up)
DS100146-4
Pη vs Iload (Step-Up)
DS100146-5
Output Source Impedance vs
Temperature (Step-Up)
DS100146-6
LM3351
www.national.com
3
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