1
2
3
4
5
6
7
8
EVALUATION
KIT
AVAILABLE
TC660
100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
GENERAL DESCRIPTION
FEATURES
The TC660 DC-to-DC voltage converter generates a
negative voltage supply, that can support a 100mA maxi-
mumload, fromapositivevoltageinputof1.5Vto5.5V. Only
two external capacitors are required.
■ Pin Compatible with TC7660
■ High Output Current ..................................... 100mA
■ Converts (+1.5V to 5.5V) to (– 1.5V to – 5.5V)
■ Power Efficiency @100mA......................... 88% typ
■ Low Power Consumption ................200µA @ 5 VIN
■ Low Cost and Easy to Use
— Only Two External Capacitors Required
■ Selectable Oscillator Frequency ....... 10kHz/90kHz
■ ESD Protection ...................................................4kV
Power supply voltage is stored on an undedicated
capacitor then inverted and transferred to an output reser-
voir capacitor. The on-board oscillator normally runs at a
frequency of 10kHz with V+ at 5V. This frequency can be
lowered by the addition of an external capacitor from OSC
(pin 7) to ground, or raised to 90kHz by connecting the
frequency control pin (FC) to V+, in order to optimize capaci-
tor size, quiescent current, and output voltage ripple
frequency. Operation using input voltage between 1.5V and
3.0V is accommodated by grounding the LV input (pin 6).
Operation at higher input voltages (3.0V to 5.5V) is accom-
plished by leaving LV open.
APPLICATIONS
■ Laptop Computers
■ µP Based Controllers
■ Process Instrumentation
■ Automotive Instruments
The TC660 open circuit output voltage is within 0.1% of
the input voltage with the output open-circuited. Power
conversion efficiency is 98% when output load is between
2mA and 5mA.
PIN CONFIGURATION (DIP and SOIC)
ORDERING INFORMATION
+
+
FC
+
1
2
3
4
8
7
6
5
FC
+
1
2
3
4
8
7
6
5
V
V
Part No.
Package
Temp. Range
CAP
CAP
OSC
LV
V
OSC
LV
V
TC660COA
TC660CPA
TC660EOA
TC660EPA
TC7660EV
8-Pin SOIC
0°C to +70°C
0°C to +70°C
TC660COA
TC660EOA
TC660CPA
TC660EPA
GND
GND
8-Pin Plastic DIP
8-Pin SOIC
–
–
CAP
CAP
OUT
OUT
– 40°C to +85°C
– 40°C to +85°C
8-Pin Plastic DIP
Evaluation Kit for
Charge Pump Family
FUNCTIONAL BLOCK DIAGRAM
+
+
V
CAP
8
2
1
FC
VOLTAGE–
LEVEL
TRANSLATOR
7
6
RC
OSCILLATOR
4
÷ 2
–
OSC
LV
CAP
5
V
OUT
INTERNAL
VOLTAGE
REGULATOR
LOGIC
NETWORK
TC660
3
GND
TC660-2 9/10/96
TELCOM SEMICONDUCTOR, INC.
4-5
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
