Data Sheet

ICL7660S, ICL7660A
FN3179 Rev 7.00 Page 5 of 13
January 23, 2013
Functional Block Diagram
VOLTAGE
LEVEL
TRANSLATOR
SUBSTRATE
NETWORK
OSC
LV
V+
CAP+
CAP-
7
OSCILLATOR
AND DIVIDE-BY-
2 COUNTER
6
INTERNAL SUPPLY
REGULATOR
3
LOGIC
Q
3
3
Q
1
V
OUT
3
8
2
Q
2
3
4
5
Q
4
GND
Typical Performance Curves
See Figure 12, “ICL7660S Test Circuit” on page 7) and Figure 13 “ICL7660A Test Circuit” on page 7
FIGURE 1. OPERATING VOLTAGE AS A
FUNCTION OF TEMPERATURE
FIGURE 2. OUTPUT SOURCE RESISTANCE AS A
FUNCTION OF SUPPLY VOLTAGE
FIGURE 3. OUTPUT SOURCE RESISTANCE AS A
FUNCTION OF TEMPERATURE
FIGURE 4. POWER CONVERSION EFFICIENCY AS A
FUNCTION OF OSCILLATOR FREQUENCY
-55 -25 0 25 50 100 125
12
10
8
6
4
2
0
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
SUPPLY VOLTAGE RANGE
(NO DIODE REQUIRED)
250
200
150
100
50
0
02 4681012
SUPPLY VOLTAGE (V)
OUTPUT SOURCE RESISTANCE (Ω)
T
A
= +125°C
T
A
= +25°C
T
A
= -55°C
350
300
250
200
150
100
50
0
OUTPUT SOURCE RESISTANCE (Ω)
-50 -25 0 25 50 75 100 125
TEMPERATURE (°C)
I
OUT
= 20mA,
V+ = 12V
I
OUT
= 20mA,
V+ = 5V
I
OUT
= 20mA,
V+ = 5V
I
OUT
= 3mA,
V+ = 2V
98
96
94
92
90
88
86
84
82
80
POWER CONVERSION EFFICIENCY (%)
100 1k 10k 50k
OSC FREQUENCY f
OSC
(Hz)
V+ = 5V
T
A
= +25°C
I
OUT
= 1mA