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PDF MAX1680 Data sheet ( Hoja de datos )
| Número de pieza | MAX1680 | |
| Descripción | Switched-Capacitor Voltage Converters | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-1247; Rev 0; 7/97
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
_______________General Description
The MAX1680/MAX1681 inductorless switched-capaci-
tor voltage converters either invert an input voltage of
+2.0V to +5.5V or double it while supplying up to
125mA output current. They have a selectable-frequen-
cy option that allows the use of small capacitors: 4.7µF
(MAX1680), 1µF (MAX1681). With their high output cur-
rent capability, these charge-pump devices are suit-
able replacements for inductor-based regulators, which
require more expensive external components and addi-
tional board space.
The devices’ equivalent output resistance (typically
3.5Ω) allows them to deliver as much as 125mA with
only a 440mV drop. A shutdown feature reduces quies-
cent current to less than 1µA. The MAX1680/MAX1681
are available in 8-pin SO packages. For devices that
deliver up to 50mA in smaller µMAX packages, refer to
the MAX860/MAX861 data sheet.
____________________________Features
o Selectable Switching Frequencies:
125kHz/250kHz (MAX1680)
500kHz/1MHz (MAX1681)
o Allow Use of Small Capacitors
(1µF for the MAX1681)
o 125mA Output Current
o 3.5Ω Output Impedance
o 1µA Logic-Controlled Shutdown
o Configurable as Voltage Inverters or Doublers
o +2.0V to +5.5V Input Voltage Range
o Available in 8-Pin SO Packages
o 90% Efficiency
________________________Applications
Local Negative Supplies
Interface Power Supplies
Op-Amp Power Supplies
MOSFET Bias
______________Ordering Information
PART
MAX1680C/D
MAX1680ESA
MAX1681C/D
MAX1681ESA
TEMP. RANGE
0°C to +70°C
-40°C to +85°C
0°C to +70°C
-40°C to +85°C
*Contact factory for dice specifications.
PIN-PACKAGE
Dice*
8 SO
Dice*
8 SO
Pin Configuration appears at end of data sheet.
__________________________________________________Typical Operating Circuits
FSEL IN
CAP+ SHDN
+VINPUT
+3V TO +5.5V
1µF
FSEL
CAP+
IN
SHDN
C2
1µF
DOUBLED
OUTPUT
VOLTAGE
C1
MAX1681
C1
1µF
GND LV
INVERTED
1µF
+VINPUT
+4V TO +5.5V
MAX1681
LV
GND
CAP- OUT
OUTPUT
C2 VOLTAGE
1µF
CAP- OUT
1µF
INVERTER CONFIGURATION
NOTE: USE 4.7µF CAPACITORS FOR MAX1680
INPUT VOLTAGE RANGE: +2.0V TO +5.5V.
DOUBLER CONFIGURATION
NOTE: USE 4.7µF CAPACITORS FOR MAX1680
INPUT VOLTAGE RANGE: +2.5V TO +5.5V.
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
http://www.Datasheet4U.com
1 page  
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
____________________________Typical Operating Characteristics (continued)
(All curves generated using the inverter configuration shown in the Typical Operating Circuits with LV = GND, FSEL = IN or LV,
C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF (MAX1681), and TA = +25°C, unless otherwise noted. Test results are also valid for
the doubler configuration with LV = OUT and TA = +25°C.)
MAX1681 EFFICIENCY vs.
LOAD CURRENT (DOUBLER CONFIGURATION)
100
80
60
VINPUT = 3V
40 VINPUT = 4V
20
0
1
VINPUT = 5.5V
FSEL = IN
10 100
LOAD CURRENT (mA)
1000
MAX1680 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
9
DOUBLER MODE
8 FSEL = LV
7
6 INVERTER MODE
FSEL = LV
5
DOUBLER MODE
4 FSEL = IN
3
2
1
INVERTER MODE
FSEL = IN
0
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
MAX1681 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
30
DOUBLER MODE
25 FSEL = LV
20 INVERTER MODE
FSEL = LV
DOUBLER MODE
15 FSEL = IN
10
5
INVERTER MODE
FSEL = IN
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)
10
9
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)
10
VINPUT = 3V, FSEL = LV
9
VINPUT = 3V, FSEL = LV
8
VINPUT = 5V, FSEL = LV
7
6 VINPUT = 3V, FSEL = IN
8
7 VINPUT = 5V, FSEL = LV
6 VINPUT = 3V, FSEL = IN
VINPUT = 5V, FSEL = IN
5
5 VINPUT = 5V, FSEL = IN
44
3
0 2 4 6 8 10 12 14 16 18 20
CAPACITANCE (µF)
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)
10
3
0 24
6 8 10 12 14 16 18 20
CAPACITANCE (µF)
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)
10
99
8
7
6
5
4
3
0
24
VINPUT = 3V, FSEL = LV
VINPUT = 3V, FSEL = IN
VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
6 8 10 12 14 16 18 20
CAPACITANCE (µF)
8
VINPUT = 3V, FSEL = LV
7
VINPUT = 3V, FSEL = IN
6
5 VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
4
3
0
24
6 8 10 12 14 16 18 20
CAPACITANCE (µF)
_______________________________________________________________________________________ 5
http://www.Datasheet4U.com
5 Page 
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
________________________________________________________Package Information
______________________________________________________________________________________ 11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX1680.PDF ] | |
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