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LM2664 Datenblatt(PDF) 5 Page - Texas Instruments

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Teilenummer LM2664
Bauteilbeschribung  LM2664 Switched Capacitor Voltage Converter
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LM2664
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SNVS005E – NOVEMBER 1999 – REVISED DECEMBER 2014
6.5 Electrical Characteristics
MIN and MAX limits apply over the full operating temperature range. Unless otherwise specified: TJ = 25°C, V+ = 5 V, C1 = C2
= 3.3
μF.
(1)
PARAMETER
TEST CONDITIONS
MIN(2)
TYP(3)
MAX(2)
UNIT
V+
Supply voltage
1.8
5.5
V
IQ
Supply current
No load
220
500
µA
ISD
Shutdown supply current
1
µA
VSD
Shutdown pin input voltage
Normal operation
2(4)
V
Shutdown mode
0.8(5)
IL
Output current
40
mA
RSW
Sum of the Rds(on)of the four internal IL = 40 mA
4
8
Ω
MOSFET switches
ROUT
Output resistance(6)
IL = 40 mA
12
25
Ω
fOSC
Oscillator frequency
See(7)
80
160
kHz
fSW
Switching frequency
See(7)
40
80
kHz
PEFF
Power efficiency
RL (1 k) between GND and OUT
90%
94%
IL = 40 mA to GND
91%
VOEFF
Voltage conversion efficiency
No load
99%
99.96%
(1)
In the test circuit, capacitors C1 and C2 are 3.3-µF, 0.3-Ω maximum ESR capacitors. Capacitors with higher ESR will increase output
resistance, reduce output voltage and efficiency.
(2)
Min. and Max. limits are ensured by design, test, or statistical analysis.
(3)
Typical numbers are not ensured but represent the most likely norm.
(4)
The minimum input high for the shutdown pin equals 40% of V+.
(5)
The maximum input low for the shutdown pin equals 20% of V+.
(6)
Specified output resistance includes internal switch resistance and capacitor ESR. See the details in Application and Implementation for
simple negative voltage converter.
(7)
The output switches operate at one half of the oscillator frequency, ƒOSC = 2ƒSW.
Copyright © 1999–2014, Texas Instruments Incorporated
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