MAX860 Maxim, MAX860 Datasheet
MAX860
Manufacturer Part Number
MAX860
Description
50mA / Frequency-Selectable / Switched-Capacitor Voltage Converters
Manufacturer
Maxim
Datasheet
1.MAX860.pdf
(12 pages)
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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 unique set of three available
frequencies. A shutdown (S
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
19-0239; Rev 1; 11/96
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
__________Typical Operating Circuit
_______________General Description
+2.5V TO +5.5V
VOLTAGE
Portable Computers
Medical Instruments
Interface Power Supplies
Hand-Held Instruments
Operational-Amplifier Power Supplies
INPUT
C1
C1
POSITIVE VOLTAGE DOUBLER
10 F
10 F
________________________________________________________________ Maxim Integrated Products
VOLTAGE INVERTER
1
2
3
4
1
2
3
4
Switched-Capacitor Voltage Converters
GND
C1-
GND
C1-
C1+
C1+
FC
FC
MAX860
MAX861
MAX860
MAX861
—
H
—
SHDN
SHDN
D
OUT
OUT
—
V
V
LV
LV
DD
DD
N
–
) pin reduces current
8
7
6
5
8
7
6
5
C2
C2
10 F
10 F
INPUT
VOLTAGE
+1.5V TO +5.5V
INVERTED
NEGATIVE
OUTPUT
DOUBLED
POSITIVE
OUTPUT
50mA, Frequency-Selectable,
____________________________Features
* Dice are tested at T
† Contact factory for availability.
__________________Pin Configuration
______________Ordering Information
MAX860ISA
MAX860IUA
MAX860C/D
MAX860ESA
MAX860MJA
MAX861ISA
MAX861IUA
MAX861C/D
MAX861ESA
MAX861MJA
8-Pin, 1.11mm High µMAX Package
Invert or Double the Input Supply Voltage
Three Selectable Switching Frequencies
High Frequency Reduces Capacitor Size
87% Efficiency at 50mA
200µA Quiescent Current (MAX860)
1µA Shutdown Supply Current
600mV Voltage Drop at 50mA Load
12Ω Output Resistance
TOP VIEW
PART
GND
C1+
C1-
FC
-25°C to +85°C
-25°C to +85°C
-40°C to +85°C
-55°C to +125°C
-25°C to +85°C
-25°C to +85°C
-40°C to +85°C
-55°C to +125°C
A
1
2
3
4
TEMP. RANGE
0°C to +70°C
0°C to +70°C
= +25°C, DC parameters only.
SO/ MAX
MAX860
MAX861
7
6
5
8
PIN-PACKAGE
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP †
8 SO
8 µMAX
Dice*
8 SO
8 CERDIP †
V
SHDN
LV
OUT
DD
1
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