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PDF MAX860 Data sheet ( Hoja de datos )
| Número de pieza | MAX860 | |
| Descripción | 50mA / Frequency-Selectable / Switched-Capacitor Voltage Converters | |
| Fabricantes | Maxim Integrated | |
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Hay una vista previa y un enlace de descarga de MAX860 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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19-0239; Rev 1; 11/96
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
_______________General Description
The MAX860/MAX861 charge-pump voltage converters
invert input voltages ranging from +1.5V to +5.5V, or
double input voltages ranging from +2.5V to +5.5V.
Because of their high switching frequencies, these
devices use only two small, low-cost capacitors. Their
50mA output makes switching regulators unnecessary,
eliminating inductors and their associated cost, size,
and EMI. Greater than 90% efficiency over most of the
load-current range, combined with a typical operating
current of only 200µA (MAX860), provides ideal perfor-
mance for both battery-powered and board-level volt-
age-conversion applications.
A frequency-control (FC) pin provides three switching-
frequencies to optimize capacitor size and quiescent
current and to prevent interference with sensitive cir-
cuitry. Each device has a
frequencies. A shutdown
(uS—nHi—qD—uNe–)speitnorfetdhureceesavcauilrarebnlet
consumption to less than 1µA. The MAX860/MAX861
are suitable for use in applications where the ICL7660
and MAX660's switching frequencies are too low. The
MAX860/MAX861 are available in 8-pin µMAX and
SO packages.
________________________Applications
Portable Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies
__________Typical Operating Circuit
____________________________Features
o 8-Pin, 1.11mm High µMAX Package
o Invert or Double the Input Supply Voltage
o Three Selectable Switching Frequencies
o High Frequency Reduces Capacitor Size
o 87% Efficiency at 50mA
o 200µA Quiescent Current (MAX860)
o 1µA Shutdown Supply Current
o 600mV Voltage Drop at 50mA Load
o 12Ω Output Resistance
______________Ordering Information
PART
MAX860ISA
MAX860IUA
MAX860C/D
MAX860ESA
MAX860MJA
MAX861ISA
MAX861IUA
MAX861C/D
MAX861ESA
MAX861MJA
TEMP. RANGE
-25°C to +85°C
-25°C to +85°C
0°C to +70°C
-40°C to +85°C
-55°C to +125°C
-25°C to +85°C
-25°C to +85°C
0°C to +70°C
-40°C to +85°C
-55°C to +125°C
PIN-PACKAGE
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP†
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP†
* Dice are tested at TA = +25°C, DC parameters only.
† Contact factory for availability.
1
2
3
C1 10µF 4
FC
MAX860
MAX861
VDD
C1+ SHDN
GND LV
C1- OUT
8
7
6
5
VOLTAGE INVERTER
INPUT
VOLTAGE
+1.5V TO +5.5V
INVERTED
NEGATIVE
OUTPUT
10µF
C2
INPUT
VOLTAGE
+2.5V TO +5.5V
C1
1
2
3
10µF 4
FC
MAX860
MAX861
VDD
C1+ SHDN
GND LV
C1- OUT
8
7
6
5
DOUBLED
POSITIVE
OUTPUT
10µF
C2
POSITIVE VOLTAGE DOUBLER
__________________Pin Configuration
TOP VIEW
FC 1
C1+ 2
GND 3
C1- 4
MAX860
MAX861
8 VDD
7 SHDN
6 LV
5 OUT
SO/µMAX
________________________________________________________________ Maxim Integrated Products 1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
1 page  
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
____________________________Typical Operating Characteristics (continued)
(All curves generated using the inverter circuit shown in the Typical Operating Circuits with LV = GND and TA = +25°C, unless other-
wise noted. Test results also valid for doubler mode with LV = OUT and TA = +25°C. All capacitor values used are those recom-
mended in Table 3, unless otherwise noted. The output resistance curves represent the resistance of the device itself, which is RO in
the equation for ROUT shown in the Capacitor Selection section.)
MAX861
OUTPUT CURRENT vs. CAPACITANCE
HIGH-FREQUENCY MODE
90
fOSC = 250kHz
80 FC = OUT
70
LV = GND
INVERTER MODE
60
VIN = +4.5V,
VOUT = -3.5V
50
40 VIN = +4.5V, VOUT = -4V
30
VIN = +3V, VOUT = -2.4V
20
10 VIN = +3V, VOUT = -2.7V
0
0.33
1 2.2 4.7 10
CAPACITANCE (µF)
22
MAX861
OUTPUT CURRENT vs. CAPACITANCE
MEDIUM-FREQUENCY MODE
80
fOSC = 100kHz
70 FC = GND
LV = GND
60 INVERTER MODE
VIN = +4.5V,
VOUT = -3.5V
50
VIN = +3V,
40 VOUT = -2.4V
30
VIN = +4.5V,
VOUT = -4V
20
10 VIN = +3V, VOUT = -2.7V
0
0.33
1 2.2 4.7 10
CAPACITANCE (µF)
22
______________________________________________________________Pin Description
PIN NAME
INVERTER
FUNCTION
DOUBLER
1 FC Frequency Control, see Table 1
Frequency Control, see Table 1
2 C1+ Flying-Capacitor Positive Terminal
Flying-Capacitor Positive Terminal
3 GND Ground
Positive Input Supply
4 C1- Flying-Capacitor Negative Terminal
Flying-Capacitor Negative Terminal
5 OUT Negative Output
Ground
6 LV Low-Voltage-Operation Input. Connect to GND. Low-Voltage-Operation Input. Connect to OUT.
7
–S—H—D—N–
Active-Low Shutdown Input. Connect to VDD if not
Active-Low Shutdown Input. Connect to GND pin if not
used. Connect to GND to disable the charge pump. used. Connect to OUT to disable the charge pump.
8 VDD Positive Input Supply
Doubled Positive Output
_______________________________________________________________________________________ 5
5 Page 
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
___________________________________________Package Information (continued)
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet MAX860.PDF ] | |
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