IC Phoenix
 
Home ›  MM29 > MAX1680ESA+-MAX1680ESA+T-MAX1681ESA+-MAX1681ESA+T,125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1680ESA+-MAX1680ESA+T-MAX1681ESA+-MAX1681ESA+T Fast Delivery,Good Price
Part Number:
If you need More Quantity or Better Price,Welcom Any inquiry.
We available via phone +865332716050 Email
Partno Mfg Dc Qty AvailableDescript
MAX1680ESA+MAIXMN/a2500avai125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1680ESA+ |MAX1680ESAMAXIMN/a790avai125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1680ESA+T |MAX1680ESATMAXN/a2500avai125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1680ESA+T |MAX1680ESATMAXIMN/a5000avai125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1681ESA+ |MAX1681ESAMAXIMN/a920avai125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
MAX1681ESA+TMAXIMN/a7500avai125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters


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 ..
MAX16820ATT+T ,2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimmingfeatures a 10% current ripple. MAX16819ATT+T -40°C to +125°C 6 TDFN-EP* +ATBThese devices operate u ..
MAX16821AATI+ ,High-Power Synchronous HB LED Drivers with Rapid Current PulsingApplicationsENDH● Front Projectors/Rear-Projection TVsVLEDI.C. L1● Portable and Pocket Projectors● ..
MAX16821BATI+ ,High-Power Synchronous HB LED Drivers with Rapid Current PulsingFeatures● Up to 30A Output CurrentThe MAX16821A, MAX16821B, and MAX16821C pulse-● True-Differential ..
MAX16823ATE+ ,High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detectionfeatures include an ● Overtemperature Shutdownactive-high, open-drain LEDGOOD output for open LED ..
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
MAX4471ESA ,Single/Dual/Quad / !.8V/750nA / SC70 / Rail-to-Rail Op AmpsApplications Ordering InformationBattery-Powered Electrometer Amplifiers TEMP. PIN- TOPSystemsPARTS ..
MAX4471ESA ,Single/Dual/Quad / !.8V/750nA / SC70 / Rail-to-Rail Op AmpsELECTRICAL CHARACTERISTICS(V = +5V, V = 0, V = 0, V = V /2, R = ∞ to V /2, T = +25°C, unless otherw ..
MAX4471ESA+ ,Single/Dual/Quad, +1.8V/750nA, SC70, Rail-to-Rail Op Amps


MAX1680ESA+-MAX1680ESA+T-MAX1681ESA+-MAX1681ESA+T
125mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
_______________General Description
The MAX1680/MAX1681 inductorless switched-capaci-
tor voltage converters either invert an input voltage of2.0V 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% Efficiency25mA, Frequency-Selectable, itched-Capacitor Voltage Converters
MAX1681
FSELIN
CAP+SHDN
GNDC1F
+VINPUT
+3V TO +5.5V
INVERTED
OUTPUT
VOLTAGEC2FF
CAP-
INVERTER CONFIGURATION
OUT
MAX1681
FSELIN
CAP+SHDN
GNDFF
DOUBLED
OUTPUT
VOLTAGE
+VINPUT
+4V TO +5.5V
NOTE: USE 4.7mF CAPACITORS FOR MAX1680
INPUT VOLTAGE RANGE: +2.5V TO +5.5V.
NOTE: USE 4.7mF CAPACITORS FOR MAX1680
INPUT VOLTAGE RANGE: +2.0V TO +5.5V.F
CAP-
DOUBLER CONFIGURATION
OUT
__________________________________________________Typical Operating Circuits

19-1247; Rev 0; 7/97
PART
MAX1680C/D

MAX1680ESA
MAX1681C/D
0°C to +70°C
-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE

Dice*
8 SO
Dice*
______________Ordering Information

*Contact factory for dice specifications.
Pin Configuration appears at end of data sheet.

MAX1681ESA-40°C to +85°C8 SO
25mA, Frequency-Selectable, itched-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
ILOAD= 125mA
Inverter configuration, = 1kΩ, LV = GND
LV = GND (Note 3)
FSEL = IN or LV
SHDN = IN
OUT = GND, SHDN = IN
CONDITIONS

187250313VIH-3.75-4.56VLOADOutput Voltage Under Load
(Note 2)3.05.5
2.05.51VILShutdown, FSEL Thresholds-11IFSELInput Bias Current (FSEL)3.510ROUTOutput Resistance (Note 2)15ROUT(SHUT)Output Resistance to Ground
in Shutdown1I+SHDNShutdown Current-11ISHDNInput Bias Current (SHDN)
UNITSMINTYPMAXSYMBOLPARAMETER

Doubler configuration, = 1kΩ, LV = OUT4.05.5
VIN2.55.5Input Voltage Range
MAX16805.410.8
FSEL = IN
(125kHz)
FSEL = LV
(250kHz)
MAX168121.6
FSEL = IN
(500kHz)
Supply Current
FSEL = LV
(1MHz)
Note 1:
Shorting OUT to IN may damage the device and should be avoided.= +25°C= +25°C= +25°C= +25°C
MAX1681
MAX1680
MAX1681
MAX1680= +25°C= +25°C= +25°C= +25°C
FSEL = LV157348
FSEL = IN
MAX1680174
FSEL = LV5701490
kHz
FSEL = IN
MAX1681
fOSCSwitching Frequency
285745
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)25mA, Frequency-Selectableitched-Capacitor Voltage Converters
FSEL = IN
FSEL = LV
MAX1681
ILOAD= 125mA
Inverter configuration, = 1kΩ, LV = GND
Doubler configuration, = 1kΩ, LV = OUT
MAX1681FSEL = LV
FSEL = IN
MAX1680
LV = GND (Note 3)
FSEL = IN or LV
SHDN = IN
OUT = GND, SHDN = IN
CONDITIONS

FSEL = IN
(500kHz)
Supply Current
FSEL = LV
(1MHz)
kHz
fOSC5701490174
Switching FrequencyVIH-3.75VLOADOutput Voltage Under Load
(Note 2)
3.05.5V
VIN-11VILShutdown, FSEL Thresholds-11IFSELInput Bias Current (FSEL)10ROUTOutput Resistance (Note 2)5ROUT(SHUT)Output Resistance in
Shutdown1I+SHDNShutdown Current1ISHDNInput Bias Current (SHDN)
UNITSMINTYPMAXSYMBOLPARAMETER

MAX1681
MAX1680
2.55.5Input Voltage Range
MAX1681
MAX1680
MAX1680
FSEL = IN
(125kHz)
FSEL = LV
(250kHz)
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.= 100Ωto GND, FSEL = INMAX1680
MAX1681%80Power Efficiency
UNITSMINTYPMAXSYMBOLPARAMETERCONDITIONS
25mA, Frequency-Selectable, itched-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.)
OUTPUT SOURCE RESISTANCE
vs. SUPPLY VOLTAGE
AX1680/81TO
C04
SUPPLY VOLTAGE (V)
(W
OUTPUT SOURCE RESISTANCE vs.
TEMPERATURE
1680/81TO
C05
TEMPERATURE (°C)
(WVINPUT = 3V
VINPUT = 5V
MAX1680 EFFICIENCY vs.
LOAD CURRENT (INVERTER CONFIGURATION)
AX1680/81TOC
LOAD CURRENT (mA)
(%
VINPUT = 5.5V
VINPUT = 4V
VINPUT = 3V
FSEL = IN
OUTPUT VOLTAGE DROP
vs. LOAD CURRENT
AX1680/81TOC01
LOAD CURRENT (mA)
(m
VINPUT = 3V
VINPUT = 5V
OSCILLATOR FREQUENCY CHANGE
vs. SUPPLY VOLTAGE
1680/81TO
C02
SUPPLY VOLTAGE (V)
(%
MAX1680
MAX1681
OSCILLATOR FREQUENCY CHANGE
vs. TEMPERATURE
AX1680/81TOC
TEMPERATURE (°C)
(%
MAX1680
MAX1681
25mA, Frequency-Selectableitched-Capacitor Voltage Converters MAX1681 EFFICIENCY vs.
LOAD CURRENT (DOUBLER CONFIGURATION)
X1680/81TOC07
LOAD CURRENT (mA)
(%
VINPUT = 5.5V
VINPUT = 4V
VINPUT = 3V
FSEL = IN1
MAX1680 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
1680/81TO
C08
SUPPLY VOLTAGE (V)
(m
DOUBLER MODE
FSEL = LV
INVERTER MODE
FSEL = IN
INVERTER MODE
FSEL = LV
DOUBLER MODE
FSEL = IN
MAX1681 SUPPLY CURRENT vs.
SUPPLY VOLTAGE
AX1680/81TO
C09
SUPPLY VOLTAGE (V)
(m
DOUBLER MODE
FSEL = LV
INVERTER MODE
FSEL = IN
INVERTER MODE
FSEL = LV
DOUBLER MODE
FSEL = IN4682101214181620
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)

X1680/81TO
C10
CAPACITANCE (mF)
(W
VINPUT = 3V, FSEL = LV
VINPUT = 5V, FSEL = LV
VINPUT = 3V, FSEL = IN
VINPUT = 5V, FSEL = IN4682101214181620
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)

1680/81TO
C13
CAPACITANCE (mF)
(W
VINPUT = 3V, FSEL = LV
VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
VINPUT = 3V, FSEL = IN4682101214181620
MAX1680 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (DOUBLER CONFIGURATION)

AX1680/81TOC11
CAPACITANCE (mF)
(WVINPUT = 3V, FSEL = LV
VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
VINPUT = 3V, FSEL = IN4682101214181620
MAX1681 OUTPUT SOURCE RESISTANCE vs.
CAPACITANCE (INVERTER CONFIGURATION)

AX1680/81TOC12
CAPACITANCE (mF)
(W
VINPUT = 3V, FSEL = LV
VINPUT = 5V, FSEL = LV
VINPUT = 5V, FSEL = IN
VINPUT = 3V, FSEL = IN
____________________________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
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 Frequencies25mA, Frequency-Selectable, itched-Capacitor Voltage Converters
______________________________________________________________Pin Description

Selects operating frequency. MAX1680: 250kHz when FSEL is low, 125kHz when FSEL is high. MAX1681:
1MHz when FSEL is low, 500kHz when FSEL is high.FSEL1
Positive Charge-Pump Capacitor ConnectionCAP+2
Negative Charge-Pump Capacitor ConnectionCAP-4
Power-Supply Ground InputGND3
Logic Voltage Input. Connect LV to GND.LV6
Power-Supply Positive Voltage InputIN8
SHDN7
Negative Voltage OutputOUT5
Power-Supply Positive Voltage Input
Power-Supply Ground Connection
Connect LV to OUT.
Not available; connect to OUT.
Shutdown Input. Driving SHDN high disables the
charge pump, and the output goes to 0V. SHDN is a
CMOS input.
Positive Voltage Output
MAX1680

250FSEL = LV
125FSEL = IN
FSEL CONNECTION
MAX1681

FREQUENCY (kHz)
INVERTERDOUBLER
PIN
FUNCTION
NAME
ic,good price


TEL:86-533-2716050      FAX:86-533-2716790
   

©2020 IC PHOENIX CO.,LIMITED