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Teilenummer | TC1121 |
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Beschreibung | 100mA Charge Pump Voltage Converter with Shutdown | |
Hersteller | Microchip | |
Logo | ||
Gesamt 14 Seiten 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 VOUT
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
TC1121
3.4 Cascading Devices
To produce greater negative magnitudes of the initial
supply voltage, the TC1121 may be cascaded (see
Figure 3-2). Resulting output resistance is approxi-
mately equal to the sum of individual TC1121 ROUT
values. The output voltage (where n is an integer
representing the number of devices cascaded) is
defined by VOUT = -n (VIN).
3.5 Paralleling Devices
To reduce output resistance, multiple TC1121s may be
paralleled (see Figure 3-3). Each device needs a pump
capacitor C1, but the reservoir capacitor C2 serves all
devices. The value of C2 should be increased by a
factor of n (the number of devices).
FIGURE 3-2:
+
C1
VI+N
FC VIN 8
2 CAP+
OSC
TC1121
3 GND
SHDN
4 CAP– VOUT 5
“1”
C1n
SHDN*
+
C2
+
FC VIN 8
2 CAP+
OSC 7
TC1121
3
GND
SHDN
4 CAP–
VOUT 5
“n”
SHDN*
VOUT
C2n
+
*SHDN should be tied to VIN if not used.
Cascading TC1121s to Increase Output Voltage
+
C1
V+IN
FC VIN 8
2 CAP+
OSC 7
TC1121
3 GND
SHDN
4 CAP– VOUT 5
“1”
OSC
C1n
SHDN*
+
FC VIN 8
2 CAP+
OSC 7
TC1121
3
GND
SHDN
4 CAP–
VOUT 5
“n”
SHDN*
C2
+
ROUT = ROUT (of TC1121)/n(number of devices)
*SHDN should be tied to VIN if not used.
FIGURE 3-3:
Paralleling TC1121s to Reduce Output Resistance
DS20001358D-page 6
2006-2014 Microchip Technology Inc.
6 Page TC1121
NOTES:
DS20001358D-page 12
2006-2014 Microchip Technology Inc.
12 Page | ||
Seiten | Gesamt 14 Seiten | |
PDF Download | [ TC1121 Schematic.PDF ] |
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