Converter. LM2663 Datasheet

LM2663 Datasheet PDF


LM2663
January 1999
LM2662/LM2663
Switched Capacitor Voltage Converter
General Description
The LM2662/LM2663 CMOS charge-pump voltage con-
verter inverts a positive voltage in the range of 1.5V to 5.5V
to the corresponding negative voltage. The LM2662/LM2663
uses two low cost capacitors to provide 200 mA of output
current without the cost, size, and EMI related to inductor
based converters. With an operating current of only 300 µA
and operating efficiency greater than 90% at most loads, the
LM2662/LM2663 provides ideal performance for battery
powered systems. The LM2662/LM2663 may also be used
as a positive voltage doubler.
The oscillator frequency can be lowered by adding an exter-
nal capacitor to the OSC pin. Also, the OSC pin may be used
to drive the LM2662/LM2663 with an external clock. For
LM2662, a frequency control (FC) pin selects the oscillator
frequency of 20 kHz or 150 kHz. For LM2663, an external
shutdown (SD) pin replaces the FC pin. The SD pin can be
used to disable the device and reduce the quiescent current
to 10 µA. The oscillator frequency for LM2663 is 150 kHz.
Features
n Inverts or doubles input supply voltage
n Narrow SO-8 Package
n 3.5typical output resistance
n 86% typical conversion efficiency at 200 mA
n (LM2662) selectable oscillator
frequency: 20 kHz/150 kHz
n (LM2663) low current shutdown mode
Applications
n Laptop computers
n Cellular phones
n Medical instruments
n Operational amplifier power supplies
n Interface power supplies
n Handheld instruments
Basic Application Circuits
Voltage Inverter
Splitting VIN in Half
DS100003-1
Positive Voltage Doubler
DS100003-2
DS100003-3
© 1999 National Semiconductor Corporation DS100003
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Part LM2663
Description Switched Capacitor Voltage Converter
Feature LM2663; LM2662/LM2663 Switched Capacitor Voltage Converter January 1999 LM2662/LM2663 Switched Capacitor V.
Manufacture National Semiconductor
Datasheet
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LM2662/LM2663 Switched Capacitor Voltage Converter January LM2663 Datasheet





LM2663
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage (V+ to GND, or GND to OUT)
6V
LV (OUT − 0.3V) to (GND + 3V)
FC, OSC, SD
The least negative of (OUT − 0.3V)
or (V+ − 6V) to (V+ + 0.3V)
V+ and OUT Continuous Output Current
250 mA
Output Short-Circuit Duration to GND (Note 2)
1 sec.
Power Dissipation (TA = 25˚C) (Note 3)
TJ Max (Note 3)
θJA (Note 3)
Operating Junction Temperature
Range
735 mW
150˚C
170˚C/W
−40˚C to +85˚C
Storage Temperature Range
−65˚C to +150˚C
Lead Temperature (Soldering, 10 seconds)
300˚C
ESD Rating
2 kV
Electrical Characteristics
Limits in standard typeface are for TJ = 25˚C, and limits in boldface type apply over the full operating temperature range.
Unless otherwise specified: V+ = 5V, FC = Open, C1 = C2 = 47 µF.(Note 4)
Symbol
Parameter
Condition
Min Typ Max Units
V+ Supply Voltage
RL = 1k
Inverter, LV = Open
Inverter, LV = GND
3.5
1.5
5.5
5.5 V
Doubler, LV = OUT
2.5
5.5
IQ Supply Current
No Load
LV = Open
FC = V+ (LM2662)
SD = Ground (LM2663)
1.3 4
mA
FC = Open
0.3 0.8
ISD Shutdown Supply Current
(LM2663)
10 µA
VSD Shutdown Pin Input Voltage Shutdown Mode
(LM2663)
Normal Operation
2.0 (Note 5)
V
0.3
IL
ROUT
fOSC
Output Current
Output Resistance (Note 6)
Oscillator Frequency (Note 7)
IL = 200 mA
OSC = Open
FC = Open
FC = V+
200
3.5
7 20
55 150
mA
7
kHz
fSW Switching Frequency (Note 8) OSC = Open FC = Open
FC = V+
3.5 10
27.5 75
kHz
IOSC
OSC Input Current
FC = Open
FC = V+
±2
µA
±10
PEFF
VOEFF
Power Efficiency
Voltage Conversion Efficiency
RL (500) between V+ and OUT
IL = 200 mA to GND
No Load
90 96
86
99 99.96
%
%
Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
beyond its rated operating conditions.
Note 2: OUT may be shorted to GND for one second without damage. However, shorting OUT to V+ may damage the device and should be avoided. Also, for tem-
peratures above 85˚C, OUT must not be shorted to GND or V+, or device may be damaged.
Note 3: The maximum allowable power dissipation is calculated by using PDMax = (TJMax − TA)/θJA, where TJMax is the maximum junction temperature, TA is the
ambient temperature, and θJA is the junction-to-ambient thermal resistance of the specified package.
Note 4: In the test circuit, capacitors C1 and C2 are 47 µF, 0.2maximum ESR capacitors. Capacitors with higher ESR will increase output resistance, reduce output
voltage and efficiency.
Note 5: In doubling mode, when Vout > 5V, minimum input high for shutdown equals Vout − 3V.
Note 6: Specified output resistance includes internal switch resistance and capacitor ESR.
Note 7: For LM2663, the oscillator frequency is 150 kHz.
Note 8: The output switches operate at one half of the oscillator frequency, fOSC = 2fSW.
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LM2663
Test Circuits
DS100003-4
FIGURE 1. LM2662 and LM2663 Test Circuits
Typical Performance Characteristics (Circuit of Figure 1)
Supply Current vs
Supply Voltage
Supply Current vs
Oscillator Frequency
DS100003-5
Output Source
Resistance vs Supply
Voltage
DS100003-37
DS100003-38
DS100003-39
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