LTC660 Linear Technology, LTC660 Datasheet - Page 5

• Manufacturer Part Number: LTC660
• Description: 100mA CMOS Voltage Converter
• Manufacturer: Linear Technology

PIN
TEST CIRCUIT
PIN
U
1
2
3
4
5
6
7
8
FUNCTIONS
U
NAME
BOOST
CAP
GND
CAP
V
LV
OSC
V
OUT
+
+
–
U
INVERTER
Internal Oscillator Frequency Control Pin.
BOOST = Open, f
BOOST = V
externally BOOST has no effect.
Positive Terminal for Charge Pump Capacitor
Power Supply Ground Input
Negative Terminal for Charge Pump Capacitor
Negative Voltage Output
Tie LV to GND when the input voltage is less than 3V.
LV may be connected to GND or left open for input
voltages above 3V. Connect LV to GND when
overdriving OSC.
An external capacitor can be connected to this pin to
slow the oscillator frequency. Keep stray capacitance
to a minimum. An external oscillator can be applied
to this pin to overdrive the internal oscillator.
Positive Voltage Input
+
, f
OSC
+
V
OSC
+
= 80kHz typ; when OSC is driven
C1
150 F
= 10kHz typ;
1
2
3
4
LTC660
Figure 1. Test Circuit
8
7
6
5
I
S
V
5V
+
+
C1
150 F
DOUBLER
Same
Same
Positive Voltage Input
Same
Power Supply Ground Input
LV must be tied to V
Same except standard logic levels will not be able to
overdrive OSC pin.
Positive Voltage Output
C
OSC
EXTERNAL
OSCILLATOR
LTC660 • F01
R
I
L
L
V
OUT
OUT
for all input voltages.
LTC660
5