TC1121_14 Datasheet, PDF (1/14 Pages) Microchip Technology – 100mA Charge Pump Voltage Converter with Shutdown

Obsolete Device
TC1121
100mA Charge Pump Voltage Converter with Shutdown
Features:
• Optional High-Frequency Operation Allows Use of
Small Capacitors
• Low Operating Current (FC = Open):
- 50 A
• 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
• P-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 left open. 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 current 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 connected OSC. Typical
supply current at 10 kHz is 50 A, and falls to less than
1 A 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.
 2006-2014 Microchip Technology Inc.
DS20001358D-page 1