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MAX1680 반도체 회로 부품 판매점

Switched-Capacitor Voltage Converters



Maxim Integrated 로고
Maxim Integrated
MAX1680 데이터시트, 핀배열, 회로
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
3.5) 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 3.5Output 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


MAX1680 데이터시트, 핀배열, 회로
125mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
ABSOLUTE MAXIMUM RATINGS
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.
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.
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.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Input Voltage Range
Inverter configuration,
RL = 1k, LV = GND
VIN
Doubler configuration,
RL = 1k, LV = OUT
MAX1680
MAX1681
MAX1680
MAX1681
2.0
3.0
2.5
4.0
5.5
5.5
V
5.5
V
5.5
Supply Current
MAX1680
I+
MAX1681
FSEL = IN
(125kHz)
FSEL = LV
(250kHz)
FSEL = IN
(500kHz)
FSEL = LV
(1MHz)
TA = +25°C
TA = +25°C
TA = +25°C
TA = +25°C
2.5 4.5
5.4
59
10.8
mA
10 18
21.6
20 36
43.2
Output Voltage Under Load
(Note 2)
VLOAD ILOAD = 125mA
-3.75 -4.56
V
Output Resistance (Note 2)
ROUT
FSEL = IN or LV
3.5 10
Output Resistance to Ground
in Shutdown
ROUT(SHUT)
SHDN = IN
1 5
Shutdown Current
Input Bias Current (SHDN)
Input Bias Current (FSEL)
Shutdown, FSEL Thresholds
Switching Frequency
I+SHDN
ISHDN
IFSEL
VIL
VIH
fOSC
OUT = GND, SHDN = IN
LV = GND (Note 3)
MAX1680
TA = +25°C
FSEL = LV
FSEL = IN TA = +25°C
MAX1681
FSEL = LV TA = +25°C
FSEL = IN TA = +25°C
-1
-1
4
187
157
94
79
750
570
375
285
1
1
1
1
250
125
1000
500
313
348
156
174
1250
1490
625
745
µA
µA
µA
V
kHz
2 _______________________________________________________________________________________
http://www.Datasheet4U.com




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