TC660 Datasheet, PDF (1/8 Pages) TelCom Semiconductor, Inc – 100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER

EVALUATION
KIT
AVAILABLE
1
TC660
100mA CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
2
FEATURES
GENERAL DESCRIPTION
s Pin Compatible with TC7660
s High Output Current ..................................... 100mA
s Converts (+1.5V to 5.5V) to (– 1.5V to – 5.5V)
s Power Efficiency @100mA ......................... 88% typ
s Low Power Consumption ................ 200µA @ 5 V_IN
s Low Cost and Easy to Use
— Only Two External Capacitors Required
s Selectable Oscillator Frequency ....... 10kHz/90kHz
s ESD Protection ................................................... 4kV
APPLICATIONS
s Laptop Computers
s µP Based Controllers
s Process Instrumentation
s Automotive Instruments
PIN CONFIGURATION (DIP and SOIC)
The TC660 DC-to-DC voltage converter generates a
negative voltage supply, that can support a 100mA maxi-
mum load, from a positive voltage input of 1.5V to 5.5V. Only
two external capacitors are required.
3 ^{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
4 ^{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.
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.
FC 1
CAP ⁺ 2
8 V+
7 OSC
GND 3 TC660CPA 6 LV
TC660EPA
CAP ^– 4
5 VOUT
FC 1
CAP ⁺ 2
8 V+
7 OSC
GND 3 ^TC660COA 6 LV
TC660EOA
CAP ^– 4
5 VOUT
ORDERING INFORMATION
Part No.
Package
TC660COA
TC660CPA
TC660EOA
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
5
Temp. Range
0°C to +70°C
0°C to +70°C
– 40°C to +85°C
TC660EPA
8-Pin Plastic DIP
– 40°C to +85°C
FUNCTIONAL BLOCK DIAGRAM
TC7660EV
Evaluation Kit for
Charge Pump Family
6
V ⁺ CAP ⁺
1
FC
8
2
OSC
7
RC
OSCILLATOR
÷2
6
LV
INTERNAL
VOLTAGE
REGULATOR
VOLTAGE–
LEVEL
TRANSLATOR
TC660
3
GND
TELCOM SEMICONDUCTOR, INC.
4 _{CAP –}
5 _VOUT
LOGIC
NETWORK
7
8
TC660-2 9/10/96
4-5