MAX860 Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

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 T_A = +25°C, DC parameters only.
† Contact factory for availability.
1
FC
MAX860
MAX861
V_DD
8
2 _C1+
SHDN ⁷
3 _GND
LV ⁶
C1 10µF 4 _C1-
OUT ⁵
VOLTAGE INVERTER
INPUT
VOLTAGE
+1.5V TO +5.5V
INVERTED
NEGATIVE
OUTPUT
10µF
C2
INPUT
VOLTAGE
+2.5V TO +5.5V
1
2
FC
MAX860
MAX861
V_DD
8
7
C1+
SHDN
3 _GND
LV ⁶
C1 10µF 4 _C1-
5
OUT
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
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