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PDF MAX828 Data sheet ( Hoja de datos )
| Número de pieza | MAX828 | |
| Descripción | Switched Capacitor Voltage Converters | |
| Fabricantes | ON | |
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MAX828 MAX829
Switched Capacitor
Voltage Converters
The MAX828/829 are CMOS “charge–pump” voltage converters in
ultra–small SOT–23 5 lead packages. They invert and/or double an
input voltage which can range from +1.5V to +5.5V. Conversion
efficiency is typically >95%. Switching frequency is 12kHz for the
MAX828 and 35kHz for the MAX829.
External component requirement is only two capacitors (3.3µF
nominal) for standard voltage inverter applications. With a few
additional components a positive doubler can also be built. All other
circuitry, including control, oscillator, power MOSFETs are integrated
on–chip. Supply current is 50 µA (MAX828) and 115 µA (MAX829).
The MAX828 and MAX829 are available in a SOT–23 5 lead
surface mount package.
Features
• Charge Pump in SOT–23 5 Lead Package
• >95% Voltage Conversion Efficiency
• Voltage Inversion and/or Doubling
• Low 50 µA (MAX828) Quiescent Current
• Operates from +1.5V to +5.5V
• Up to 25 mA Output Current
• Only Two External Capacitors Required
• Tested Operating Temperature Range: –40°C to +85°C
Typical Applications
• LCD Panel Bias
• Cellular Phones
• Pagers
• PDAs, Portable Dataloggers
• Battery–Powered Devices
TYPICAL OPERATING CIRCUIT
+
C1
Voltage Inverter
C+ Vin
C–
GND
OUT
INPUT
V–
OUTPUT
C2
+
http://onsemi.com
SOT–23–5
SN SUFFIX
CASE TBD
PRELIMINARY INFORMATION
PIN CONFIGURATION
(Top View)
OUT 1
5 C+
Vin 2
C– 3
4 GND
SOT–23–5*
NOTE: *SOT–23–5 is equivalent to EIAJ–SC74A
ORDERING INFORMATION
Device
Package
Shipping
MAX828SNTR SOT–23–5 3000 Tape/Reel
MAX829SNTR SOT–23–5 3000 Tape/Reel
© Semiconductor Components Industries, LLC, 1999
February, 2000 – Rev. 0
1
Publication Order Number:
MAX828/D
1 page  
MAX828 MAX829
+Rout
Rout OF SINGLE DEVICE
NUMBER OF DEVICES
Vin+
3
C1
+
4
MAX828
MAX829
“1”
2
51
3
C1
+
4
5
MAX828
MAX829
“n”
...
2
Vout
1
Diode Protection for Heavy Loads
When heavy loads require the OUT pin to sink large
currents being delivered by a positive source, diode
protection may be needed. The OUT pin should not be
allowed to be pulled above ground. This is accomplished by
connecting a Schottky diode (1N5817) as shown in Figure
7.
GND
4
MAX828
MAX829
Vout = Vin–
C2
+
Figure 5. Paralleling MAX828s or MAX829s to
Reduce Output Resistance
Voltage Doubler/Inverter
Another common application of the MAX828/829 is
shown in Figure 6. This circuit performs two functions in
combination. C1 and C2 form the standard inverter circuit
described above. C3 and C4 plus the two diodes form the
voltage doubler circuit. C1 and C3 are the pump capacitors
and C2 and C4 are the reservoir capacitors. Because both
sub–circuits rely on the same switches if either output is
loaded, both will droop toward GND. Make sure that the
total current drawn from both the outputs does not total more
than 40mA.
Vin+
3
C1
+
4
MAX828
MAX829
2
D1, D2 = 1N4148
D1
OUT
1
Figure 7. High V– Load Current
Layout Considerations
As with any switching power supply circuit good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
5
1
Vout = Vin–
C2
+
D2 Vout = (2Vin) –
+
C3
+ C4 (VFD1) – (VFD2)
Figure 6. Combined Doubler and Inverter
http://onsemi.com
5
5 Page 
Notes
MAX828 MAX829
http://onsemi.com
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX828.PDF ] | |
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