MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
_______________General Description ____________________________Features
The MAX860/MAX861 charge-pump voltage converters
8-Pin, 1.11mm High MAX Package
invert input voltages ranging from +1.5V to +5.5V, or
double input voltages ranging from +2.5V to +5.5V.
Invert or Double the Input Supply Voltage
Because of their high switching frequencies, these
Three Selectable Switching Frequencies
devices use only two small, low-cost capacitors. Their
50mA output makes switching regulators unnecessary,
High Frequency Reduces Capacitor Size
eliminating inductors and their associated cost, size,
87% Efficiency at 50mA
and EMI. Greater than 90% efficiency over most of the
load-current range, combined with a typical operating
200A Quiescent Current (MAX860)
current of only 200A (MAX860), provides ideal perfor-
mance for both battery-powered and board-level volt-
1A Shutdown Supply Current
age-conversion applications.
600mV Voltage Drop at 50mA Load
A frequency-control (FC) pin provides three switching-
frequencies to optimize capacitor size and quiescent 12 Output Resistance
current and to prevent interference with sensitive cir-
cuitry. Each device has a unique set of three available
______________Ordering Information
frequencies. A shutdown (SHDN) pin reduces current
consumption to less than 1A. The MAX860/MAX861
PART TEMP RANGE PIN-PACKAGE
are suitable for use in applications where the ICL7660
MAX860ISA -25C to +85C 8 SO
and MAX660's switching frequencies are too low. The
MAX860/MAX861 are available in 8-pin MAX and
MAX860IUA -25C to +85C 8 MAX
SO packages.
MAX860C/D 0C to +70C Dice*
________________________Applications
MAX860ESA -40C to +85C 8 SO
Portable Computers
MAX860MJA -55C to +125C 8 CERDIP
Medical Instruments
MAX860MSA/PR3 -55C to +125C 8 SO
Interface Power Supplies
MAX861ISA -25C to +85C 8 SO
Hand-Held Instruments
MAX861IUA -25C to +85C 8 MAX
Operational-Amplifier Power Supplies
MAX861C/D 0C to +70C Dice*
MAX861ESA -40C to +85C 8 SO
__________Typical Operating Circuit
MAX861MJA -55C to +125C 8 CERDIP
*Dice are tested at T = +25C, DC parameters only.
A
INPUT
1 MAX860 8
Contact factory for availability.
FC V
DD VOLTAGE
MAX861
+1.5V TO +5.5V
7
2
C1+ SHDN
3 6
__________________Pin Configuration
GND LV
INVERTED
NEGATIVE
C1 10F 4 5
C1- OUT
OUTPUT
10F
C2
TOP VIEW
VOLTAGE INVERTER
+
INPUT
FC 1 8 V
DD
VOLTAGE
DOUBLED
1 8
MAX860
+2.5V TO +5.5V FC V
DD POSITIVE
MAX860
SHDN
C1+ 2 7
MAX861
OUTPUT
2 7
MAX861
C1+ SHDN
10F LV
GND 3 6
3 6
C2
GND LV
C1- OUT
4 5
C1 10F 4 5
C1- OUT
SO/MAX
POSITIVE VOLTAGE DOUBLER
MAX is a registered trademark of Maxim Integrated Products, Inc.
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-0239; Rev 3; 8/13MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
ABSOLUTE MAXIMUM RATINGS
Supply Voltage (V to GND or GND to OUT)...................+6.0V Operating Temperature Ranges
DD
Input Voltage Range (LV, FC, SHDN ) ...................(OUT - 0.3V) MAX86_I_A ......................................................-25C to +85C
to (V + 0.3V) MAX86_ESA.....................................................-40C to +85C
DD
Continuous Output Current (OUT, V ) .............................60mA MAX86_M_A ..................................................-55C to +125C
DD
Output Short-Circuit to GND (Note 1).......................................1s Storage Temperature Range .............................-65C to +160C
Continuous Power Dissipation (T = +70C) Lead Temperature (soldering, 10s) .................................+300C
A
SO (derate 5.88mW/C above +70C).........................471mW Soldering Temperature (reflow) .......................................+240C
MAX (derate 4.2mW/C above +70C) ......................362mW
CERDIP (derate 8.00mW/C above +70C).................640mW
Note 1: OUT may be shorted to GND for 1sec without damage, but shorting OUT to V may damage the device and should be
DD
avoided. Also, for temperatures above +85C, OUT must not be shorted to GND or V , even instantaneously, or device
DD
damage may result.
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 Circuit (Inverter), V = +5V, SHDN= V , FC = LV = GND, C1 = C2 = 10F (Note 2), T = T to T , unless
DD DD A MIN MAX
otherwise noted. Typical values are at T = +25C.)
A
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Inverter, LV = GND 1.5 5.5
Supply Voltage V R = 1k V
DD L
Doubler, LV = OUT 2.5 5.5
FC = V = 5V 0.2 0.3
DD
FC = V = 3V 0.07
DD
MAX860I/E
FC = GND 0.6 1.0
FC = OUT 1.4 2.5
FC = V 0.4
DD
MAX860M FC = GND 1.3
No-Load Supply Current
I FC = OUT 3.3 mA
DD
(Note 3)
FC = V 0.3 0.4
DD
MAX861I/E FC = GND 1.1 2.0
FC = OUT 2.5 5.0
FC = V 0.5
DD
MAX861M FC = GND 2.6
FC = OUT 6.5
V = 5V, V more negative than -3.75V 50 100
DD OUT
Output Current I mA
OUT
V = 3V, V more negative than -2.5V 10 30
DD OUT
I = 50mA 12 25
Output Resistance L
R
OUT
(Note 4)
I = 10mA, V = 2V 20 35
L DD
2
Maxim Integrated