TC1121_06 Datasheet, PDF (1/14 Pages) Microchip Technology – 100mA Charge Pump Voltage Converter with Shutdown

TC1121
100mA Charge Pump Voltage Converter with Shutdown
Features:
• Optional High-Frequency Operation Allows Use of
Small Capacitors
• Low Operating Current (FC = GND):
- 50 μA
• High Output Current (100 mA)
• Converts a 2.4V to 5.5V Input Voltage to a
Corresponding Negative Output Voltage
(Inverter mode)
• Uses Only 2 Capacitors; No Inductors Required
• Selectable Oscillator Frequency:
- 10 kHz to 200 kHz
• Power-Saving Shutdown Input
• Available in 8-Pin MSOP, 8-Pin PDIP and 8-Pin
Small Outline (SOIC) Packages
Applications:
• Laptop Computers
• Medical Instruments
• Disk Drives
• μP-Based Controllers
• Process Instrumentation
Device Selection Table
Part
Number
Package
TC1121COA
TC1121CPA
TC1121CUA
TC1121EOA
TC1121EPA
TC1121EUA
8-Pin SOIC
8-Pin PDIP
8-Pin MSOP
8-Pin SOIC
8-Pin PDIP
8-Pin MSOP
Operating
Temp.
Range
0°C to +70°C
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
Package Type
8-Pin PDIP
FC 1
8 _V+
CAP⁺ 2 _TC1121CPA 7 OSC
GND 3 ^TC1121EPA 6 SHDN
CAP^– 4
5 VOUT
8-Pin SOIC
8-Pin MSOP
FC 1
8 _V+
TC1121COA
CAP⁺ 2 _TC1121EOA 7 OSC
GND 3 ^TC1121CUA 6 SHDN
TC1121EUA
CAP^{– 4}
5 V_OUT
General Description:
The TC1121 is a charge pump converter with 100 mA
output current capability. It converts a 2.4V to 5.5V
input to a corresponding negative output voltage. As
with all charge pump converters, the TC1121 uses no
inductors saving cost, size and EMI.
An on-board oscillator operates at a typical frequency
of 10 kHz (at V⁺ = 5V) when the frequency control input
(FC) is connected to ground. The oscillator frequency
increases to 200 kHz when FC is connected to V⁺,
allowing the use of smaller capacitors. Operation at
sub-10 kHz frequencies results in lower quiescent
NScurrent and is accomplished with the addition of an
external capacitor from OSC (pin 7) to ground. The
TC1121 also can be driven from an external clock
NSconnected OSC. Typical supply current at 10 kHz is
50 μA, and falls to less than 1 μA when the shutdown
input is brought low, whether the internal or an external
clock is used. The TC1121 is available in 8-pin SOIC,
MSOP and PDIP packages.
© 2006 Microchip Technology Inc.
DS21358C-page 1