MAX861IUA-T Datasheet, PDF (9/11 Pages) Maxim Integrated Products – 50mA, Frequency-Selectable, Switched-Capacitor Voltage Converters

MAX860/MAX861
50mA, Frequency-Selectable,
Switched-Capacitor Voltage Converters
+V_IN
8
2
MAX860
7
D1, D2 = 1N4148
C1
3 MAX861
D1
4
5
V_OUT = -V_IN
C2
D2
V_OUT = (2V_IN) -
C3
C4 ^{(VFD1) - (VFD2)}
Figure 3. Combined Doubler and Inverter
Table 5. Product Selection Guide
PART
NUMBER
OUTPUT
CURRENT
(mA)
OUTPUT SWITCHING
RESISTANCE FREQUENCY
(Ω)
(kHz)
MAX660
100
6.5
5/40
MAX665
100
6.5
5/40
MAX860
50
12
6/50/130
MAX861
50
12
13/100/250
ICL7660
10
55
5
sure the sum of the currents drawn from the two out-
puts does not exceed 60mA. Connect LV as with a
standard inverter circuit (see Pin Description).
Compatibility with
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.
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have an OSC pin
and ICL7660 nor-
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MAX860/MAX861
on the MAX860/
MAX861 floating.
The MAX860/MAX861 operate with FC either floating or
connected to V_DD, OUT, or GND; each connection
defines the oscillator frequency. Thus, any of the nor-
mal MAX660, MAX665, or ICL7660 connections to pin 1
will work with the MAX860/MAX861, without modifica-
tions. Changes to the FC connection are only required
if you want to adjust the operating frequency.
___________________Chip Topography
FC
V_DD
C1+
GND
C1-
0.084"
(2.13mm)
SHDN
LV
OUT
0.058"
(1.47mm)
PROCESS: BiCMOS
SUBSTRATE CONNECTED TO V_DD
Maxim Integrated
9