MAX1680 Maxim, MAX1680 Datasheet
MAX1680
Manufacturer Part Number
MAX1680
Description
125mA / Frequency-Selectable / Switched-Capacitor Voltage Converters
Manufacturer
Maxim
Datasheet
1.MAX1680.pdf
(12 pages)
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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.
Pin Configuration appears at end of data sheet.
________________________Applications
19-1247; Rev 0; 7/97
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.
__________________________________________________Typical Operating Circuits
_______________General Description
Local Negative Supplies
Interface Power Supplies
Op-Amp Power Supplies
MOSFET Bias
NOTE: USE 4.7 F CAPACITORS FOR MAX1680
1 F
C1
INPUT VOLTAGE RANGE: +2.0V TO +5.5V.
________________________________________________________________ Maxim Integrated Products
Switched-Capacitor Voltage Converters
INVERTER CONFIGURATION
FSEL
CAP+
GND
CAP-
MAX1681
SHDN
OUT
LV
IN
1 F
125mA, Frequency-Selectable,
C2
1 F
+V
+3V TO +5.5V
INPUT
INVERTED
OUTPUT
VOLTAGE
+4V TO +5.5V
* Contact factory for dice specifications.
____________________________Features
______________Ordering Information
MAX1680C/D
MAX1680ESA
MAX1681C/D
MAX1681ESA
NOTE: USE 4.7 F CAPACITORS FOR MAX1680
+V
Selectable Switching Frequencies:
Allow Use of Small Capacitors
(1µF for the MAX1681)
125mA Output Current
3.5Ω Output Impedance
1µA Logic-Controlled Shutdown
Configurable as Voltage Inverters or Doublers
+2.0V to +5.5V Input Voltage Range
Available in 8-Pin SO Packages
90% Efficiency
INPUT
125kHz/250kHz (MAX1680)
500kHz/1MHz (MAX1681)
PART
INPUT VOLTAGE RANGE: +2.5V TO +5.5V.
1 F
1 F
C1
DOUBLER CONFIGURATION
-40°C to +85°C
-40°C to +85°C
TEMP. RANGE
0°C to +70°C
0°C to +70°C
FSEL
CAP+
GND
CAP-
MAX1681
SHDN
OUT
LV
IN
1 F
C2
Dice*
8 SO
Dice*
8 SO
PIN-PACKAGE
DOUBLED
OUTPUT
VOLTAGE
1
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