MAX860-MAX861 MAXIM [Maxim Integrated Products], MAX860-MAX861 Datasheet

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MAX860-MAX861

Manufacturer Part Number
MAX860-MAX861
Description
50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters
Manufacturer
MAXIM [Maxim Integrated Products]
Datasheet
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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MAX860-MAX861 Summary of contents

Page 1

... 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- ...

Page 2

... GND 10µF (Note 2 +25°C.) CONDITIONS Inverter GND R = 1kΩ L Doubler OUT MAX860I GND FC = OUT MAX860M FC = GND FC = OUT MAX861I GND FC = OUT MAX861M FC = GND FC = OUT V = 5V, V more negative than -3.75V DD OUT V = 3V, V more negative than -2 ...

Page 3

... L to OUT MAX860 1kΩ from OUT L to GND R = 2kΩ from OUT MAX861 1kΩ from OUT L to GND MAX860/MAX861 50mA to GND 68µ load LV = GND IH IL MAX86_I/E – — — — – < ...

Page 4

... SUPPLY VOLTAGE 500 DOUBLER OUT 400 300 INVERTER GND (V > 3V) DD 200 100 SUPPLY VOLTAGE (V) MAX860 OUTPUT CURRENT vs. CAPACITANCE MEDIUM-FREQUENCY MODE 50kHz OSC FC = GND GND INVERTER MODE +4.5V -3.5V IN OUT +3V -2.4V IN OUT ...

Page 5

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 T wise noted. Test results also valid for doubler mode with LV = OUT and ...

Page 6

... The lowest fundamental frequency of the switching noise is equal to the minimum specified switching frequency (e.g., 3kHz for the MAX860 with FC open). The spectrum of noise frequencies extends above this value because of harmonics in the switching waveform ...

Page 7

... Supply Current Smaller __________Applications Information Capacitor Selection The MAX860/MAX861 are tested using 10µF capacitors for both C1 and C2, although smaller or larger values can be used (Table 3). Smaller C1 values increase the output resistance; larger values reduce the output resistance. Above a certain point, increasing the ...

Page 8

... Pin Description ). MAX860 MAX861 OUT “n” -nV OUT IN Figure 2. Paralleling MAX860s or MAX861s to Reduce Output Resistance , but this is IN Paralleling Devices Combined Doubler/Inverter R OF SINGLE DEVICE OUT R = OUT NUMBER OF DEVICES … ...

Page 9

... MAX660/MAX665/ICL7660 The MAX860/MAX861 can be used in sockets designed for the MAX660, MAX665, and ICL7660 with a minimum of one wiring change. This section gives advice on installing a MAX860/MAX861 into a socket designed for one of the earlier devices. The MAX660, MAX665, and ICL7660 have an OSC pin – ...

Page 10

Frequency-Selectable, Switched-Capacitor Voltage Converters ________________________________________________________Package Information 10 ______________________________________________________________________________________ ...

Page 11

Switched-Capacitor Voltage Converters ___________________________________________Package Information (continued) ______________________________________________________________________________________ 50mA, Frequency-Selectable, 11 ...

Page 12

Frequency-Selectable, Switched-Capacitor Voltage Converters Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without ...

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