100mA CHARGE PUMP DC-TO-DC
VOLTAGE CONVERTER
TC660
TYPICAL CHARACTERISTICS
(Cont.)
10)
100
OSCILLATOR FREQUENCY (kHz)
LV GROUNDED
OSCILATOR FREQUENCY (kHz)
80
LV OPEN
Oscillator Frequency
vs. Supply Voltage
11)
12
10
8
6
4
Oscillator Frequency
vs. Temperature
12)
100
OSCILLATOR FREQENCY (kHz)
Oscillator Frequency
vs. Temperature
80
60
FC = V+, OSC = OPEN
60
40
40
FC = V+, OSC = OPEN
20
FC= OPEN, OSC = OPEN
2
0
-40
20
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
-20
20
40
60
TEMPERATURE (°C)
0
80
100
0
-40
-20
20
40
60
0
TEMPERATURE (°C)
80
100
13)
Oscillator Frequency
vs. External Capacitance
14)
TC7660 and TC660 Output
Voltage and Power Efficiency
vs. Load Current, V
+ =
5V
TC7660
100
100
OSCILLATOR FREQUENCY (kHz)
FC = V+
OUTPUT VOLTAGE (V)
10
-3.0
TC660
-3.8
EFF
VOUT
TC660
84
1
-4.2
76
0.1
FC = OPEN
-4.6
TC7660
40
60
80
LOAD CURRENT (mA)
68
0.01
-5.0
1 2
5 10 20
100 500 2000 10000
CAPACITANCE (pF)
0
2.0
60
100
PIN DESCRIPTION
Pin No.
1
2
3
4
5
6
7
8
Symbol
FC
CAP
+
GND
CAP
–
V
OUT
LV
OSC
V
+
Description
Internal Oscillator frequency control. f
≈
10 kHz when FC
≈
OPEN;
≈
90 kHz when
FC = V
+
. FC has no effect if OSC is overdriven.
External capacitor, + terminal
Power-Supply Ground (Inverter) or Positive Input (Doubler)
External capacitor, – terminal
Negative Voltage output (Inverter) or Ground (Doubler)
"Low-Voltage" pin. Connect to GND Pin for inverter operation when V
IN
< 3V; leave
open or GND above 3V. When overdriving OSC, connect to GND.
For external control of internal OSC. Connect ext. C from OSC to GND (close to pkg.)
to reduce frequency of oscillator
Positive Voltage Input (Inverter) or Output (Doubler)
POWER EFFICIENCY (%)
-3.4
92
4-8
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
