100mA CHARGE PUMP DC-TO-DC
VOLTAGECONVERTER
TC660
TYPICAL CHARACTERISTICS (Cont.)
Oscillator Frequency
vs. Temperature
11)
12)
Oscillator Frequency
vs. Temperature
Oscillator Frequency
vs. Supply Voltage
10)
100
100
12
10
LV GROUNDED
80
60
40
80
60
40
20
0
LV OPEN
8
6
4
2
0
+
FC = V , OSC = OPEN
+
FC= OPEN, OSC = OPEN
FC = V , OSC = OPEN
20
0
1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
-40 -20
0
20
40
60
80 100
-20
20
40
60
100
80
-40
0
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
TEMPERATURE (°C)
Oscillator Frequency
14)
TC7660 and TC660 Output
13)
vs. External Capacitance
Voltage and Power Efficiency
+
vs. Load Current, V = 5V
-3.0
-3.4
-3.8
-4.2
100
100
TC7660
+
FC = V
92
84
76
68
60
10
1
TC660
TC660
EFF
V
OUT
FC = OPEN
0.1
0.01
-4.6
-5.0
TC7660
40
LOAD CURRENT (mA)
1
2
5
10 20
CAPACITANCE (pF)
100
500 2000 10000
0
60
80
100
2.0
PIN DESCRIPTION
Pin No.
Symbol
Description
1
FC
Internal Oscillator frequency control. f ≈ 10 kHz when FC ≈ OPEN; ≈ 90 kHz when
FC = V+. FC has no effect if OSC is overdriven.
2
3
4
5
6
CAP+
GND
CAP–
VOUT
LV
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 VIN < 3V; leave
open or GND above 3V. When overdriving OSC, connect to GND.
7
8
OSC
V+
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)
4-8
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
