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LM3351MM Datasheet(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM3351MM
Description  Switched Capacitor Voltage Converter
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 3 page
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Electrical Characteristics
2/3 Step-Down Voltage Converter (Continued)
Specifications in standard type face are for T
j = 25˚C, 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 µF.
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
Ω (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
µA
1
µA(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 25˚C and represent the most likely parametric norm.
Note 5: Limits are 100% production tested at 25˚C. 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
www.national.com
3




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