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MAX1680ESAMAXIMN/a1300avai125mA / Frequency-Selectable / Switched-Capacitor Voltage Converters
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MAX1681ESAN/a13avai125mA / Frequency-Selectable / Switched-Capacitor Voltage Converters
MAX1681ESAMAXIMN/a1746avai125mA / Frequency-Selectable / Switched-Capacitor Voltage Converters
MAX1681ESAMAXIM ?N/a28avai125mA / Frequency-Selectable / Switched-Capacitor Voltage Converters


MAX1681ESA ,125mA / Frequency-Selectable / Switched-Capacitor Voltage ConvertersApplications ______________Ordering InformationLocal Negative SuppliesPART TEMP. RANGE PIN-PACKAGEM ..
MAX1681ESA ,125mA / Frequency-Selectable / Switched-Capacitor Voltage ConvertersMAX1680/MAX168119-1247; Rev 0; 7/97125mA, Frequency-Selectable, Switched-Capacitor Voltage Converte ..
MAX1681ESA ,125mA / Frequency-Selectable / Switched-Capacitor Voltage ConvertersELECTRICAL CHARACTERISTICS(Typical Operating Circuits (inverter configuration), FSEL = LV = GND, V ..
MAX1681ESA+ ,125mA, Frequency-Selectable, Switched-Capacitor Voltage ConvertersMAX1680/MAX168119-1247; Rev 0; 7/97125mA, Frequency-Selectable, Sw itched-Capacitor Voltage Convert ..
MAX1681ESA+T ,125mA, Frequency-Selectable, Switched-Capacitor Voltage ConvertersGeneral Description ________
MAX16820ATT+ ,2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 DimmingApplicationsTypical Operating Circuit● Architectural, Industrial, and Ambient Lighting● MR16 and Ot ..
MAX4468EKA+T ,Low-Cost, Micropower, SC70/SOT23-8, Microphone Preamplifiers with Complete ShutdownMAX4465–MAX446919-1950; Rev 1; 4/01Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with ..
MAX4468EKA-T ,Low-Cost / Micropower / SC70/SOT23-8 / Microphone Preamplifiers with Complete ShutdownMAX4465–MAX446919-1950; Rev 1; 4/01Low-Cost, Micropower, SC70/SOT23-8, MicrophonePreamplifiers with ..
MAX4469EKA-T ,Low-Cost / Micropower / SC70/SOT23-8 / Microphone Preamplifiers with Complete ShutdownELECTRICAL CHARACTERISTICS(V = +5V, V = 0, V = V /2, R = ∞ to V /2, SHDN = GND (MAX4467/MAX4468 onl ..
MAX4469EKA-T ,Low-Cost / Micropower / SC70/SOT23-8 / Microphone Preamplifiers with Complete ShutdownApplicationsMAX4465EUK-T -40°C to +85°C 5 SOT23-5Microphone PreamplifiersMAX4466EXK-T -40°C to +85° ..
MAX4470EUK-T ,Single/Dual/Quad / !.8V/750nA / SC70 / Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS (continued)(V = +5V, V = 0, V = 0, V = V /2, R = ∞ to V /2, T = +25°C, u ..
MAX4470EXK+T ,Single/Dual/Quad, +1.8V/750nA, SC70, Rail-to-Rail Op Amps


MAX1680ESA-MAX1681ESA
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.
________________________Applications

Local Negative Supplies
Interface Power Supplies
Op-Amp Power Supplies
MOSFET Bias
____________________________Features
Selectable Switching Frequencies:
125kHz/250kHz (MAX1680)
500kHz/1MHz (MAX1681)
Allow Use of Small Capacitors
(1µF for the MAX1681)
125mA Output Current3.5ΩOutput Impedance1µA Logic-Controlled ShutdownConfigurable as Voltage Inverters or Doublers+2.0V to +5.5V Input Voltage RangeAvailable in 8-Pin SO Packages90% Efficiency
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters

19-1247; Rev 0; 7/97
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(Typical Operating Circuits(inverter configuration), FSEL = LV = GND, VIN= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681), TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
IN..............................................................................-0.3V to +6V
LV....................................................(VOUT- 0.3V) to (VIN+ 0.3V)
CAP+...........................................................-0.3V to (VIN+ 0.3V)
SHDN, FSEL......................................(VLV- 0.3V) to (VIN+ 0.3V)
OUT, CAP-..................................................................-6V to 0.3V
Continuous Output Current ..............................................135mA
Output Short-Circuit Duration to GND (Note 1) ...................1sec
Continuous Power Dissipation (TA= +70°C)
SO (derate 5.88mW/°C above +70°C)..........................471mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
Note 1:
Shorting OUT to IN may damage the device and should be avoided.
ELECTRICAL CHARACTERISTICS
(Typical Operating Circuits (inverter configuration), FSEL = LV = GND, VIN= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681), TA= -40°C to +85°C, unless otherwise noted.) (Note 4)
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
ELECTRICAL CHARACTERISTICS (continued)

(Typical Operating Circuits(inverter configuration), FSEL = LV = GND, VIN= 5V, C1 = C2 = 10µF (MAX1680), C1 = C2 = 2.2µF
(MAX1681), TA= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
Note 2:
C1 and C2 are low-ESR (<0.2Ω) capacitors. Capacitor ESR adds to the circuit’s output resistance. Using capacitors with
higher ESR reduces output voltage and efficiency. The specified output resistance includes the C1 and C2 0.2ΩESR.
Note 3:
The typical threshold for VINPUTother than +5V is 0.35VINPUT(VIL= VIH).
Note 4:
Specifications to -40°C are guaranteed by design, not production tested.
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
__________________________________________Typical Operating Characteristics

(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.)
MAX1680/MAX1681
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.)
_______________Detailed Description
The MAX1680/MAX1681 switched-capacitor voltage
converters either invert or double the input voltage.
They have low output resistance (3.5Ω) and can deliver
up to 125mA output current. These devices operate at
one of two selectable frequencies: 125kHz/250kHz
(MAX1680) and 500kHz/1MHz (MAX1681). This pro-
vides the flexibility to optimize capacitor size, operating
supply current, and overall circuit efficiency. Frequency
selection also allows for minimizing coupling into other
sensitive circuits. These devices contain no internal
divider; the oscillator frequency equals the switching
frequency. The devices can easily be cascaded to pro-
duce a higher output voltage, or paralleled to deliver
more current.
The MAX1680/MAX1681 feature a shutdown mode that
reduces supply current to <1µA (SHDN = high). OUT,
in the inverter configuration, pulls to ground in shut-
down mode. Shutdown is not available in the doubler
configuration; connect SHDN to OUT.
__________Applications Information
Voltage Inverter

A simple voltage inverter is the most common
MAX1680/MAX1681 application. It requires three exter-
nal capacitors (including the input bypass capacitor)
as shown in the Typical Operating Circuits(inverter
configuration). Although the output is not regulated, low
output resistance produces a typical drop of only 0.44V
with a 125mA load. This low output resistance makes
the devices fairly insensitive to changes in load (see
the graphs for Output Source Resistance vs.
Temperature and Supply Voltage in the Typical
Operating Characteristicssection).
Voltage Doubler

The MAX1680/MAX1681 can be configured as a volt-
age doubler with two external capacitors as shown in
the Typical Operating Circuits(doubler configuration).
When loaded, the output voltage drop is similar to that
of the voltage inverter. The minimum input supply range
is slightly higher than in the inverter configuration.
Calculate ripple voltage using the equation in the
Capacitor Selectionsection.
Frequency Control

A frequency-control pin, FSEL, provides design flexibili-
ty. Each device has two selectable frequencies:
125kHz/250kHz (MAX1680) and 500kHz/1MHz
(MAX1681). This allows optimization of capacitor size
and supply current for a given output load. Table 1
summarizes the frequency options .
Table 1. Nominal Switching Frequencies
MAX1680/MAX1681
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
______________________________________________________________Pin Description
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