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参数资料
| 型号： | TC1684EUA |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 170 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | MSOP-8 |
| 文件页数： | 4/6页 |
| 文件大小： | 634K |
| 代理商： | TC1684EUA |
4
TC1682
TC1683
TC1684
Inverting Charge Pump Voltage
Doublers with Active High Shutdown
TC1682/3/4-1 8/14/00
Input Supply Bypassing
TheVIN input should be capacitively bypassed to reduce
AC impedance and minimize noise effects due to the
devices internal switching. It is recommended that a large
value capacitor (at least equal to C1) be connected from VIN
to GND for optimal circuit performance.
Shutdown Input
The TC1682, TC1683 and TC1684 are enabled when
SHDN is low, and disabled when SHDN is high. This input
cannot be allowed to float. (If SHDN is not required, see the
TC2682/2683/2684 data sheet.) The SHDN input should be
limited to 0.3V above VIN.
Inverting Voltage Doubler
The most common application for the TC1682/1683/
1684 devices is the inverting voltage doubler (Figure 2).
This application uses three external capacitors: C1, C2, and
COUT (NOTE: a power supply bypass capacitor is recom-
mended). The output is equal to –2VIN plus any voltage
drop due to loading. Refer to Tables 1 and 2 for capacitor
selection guidelines.
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
Figure 2. Inverting Voltage Doubler Test Circuit
C1
C2
V
IN
C
IN
V
OUT
R
L
V
IN
C
OUT
V
OUT
TC1682
TC1683
TC1684
C1–
SHDN
C2–
2
1
7
6
8
4
5
3
C1+
C2+
GND
TC1682 DEMO CARD
The TC1682 DEMO Card is a 2.0” x 2.0” card containing
both a TC1682 and a TC682 that allow the user to compare
the operation of each approach for generating a –2X func-
tion.
Each circuit is fully assembled with the required
external capacitors along with variable load resistors that
allow the user to vary the output load current of each stage.
For convenience, several test points and jumpers are avail-
able for measuring various voltages and currents on the
demo board.
TC1682 DEMO CARD ASSEMBLY
Figure 3 is a schematic of the TC1682 DEMO Card, and
Figure 4 shows the assembly drawing and artwork for the
board. Table 3 lists the voltages that are monitored by the
test points and Table 4 lists the currents that can be
measured using the jumpers.
Table 3. TC1682 DEMO Card Test Points
Test Point
Voltage Measurement
TP1
VIN [ +1.8V to +5V]
TP2
Ground
TP3
Ground
TP4
TC682 (U1) Supply Voltage
TP5
TC682 (U1) Output Voltage [VOUT1]
TP6
TC1682 (U2) Supply Voltage
TP7
TC1682 (U2) Output Voltage [VOUT2]
TP8
TC1682 (U2) SHDN Input Voltage
TP9
DEMO Card Shutdown Input
Table 4. TC1682 DEMO Card Jumpers
Jumper
Current Measurement
J1
TC682 (U1) Quiescent Current
J2
TC1682 (U2) Quiescent Current
J3
TC682 (U1) VOUT1 Load Current
J4
TC1682 (U2) VOUT2 Load Current
J5
TC1682 (U2) SHDN Input Current
J6
Connect DEMO Card Shutdown Input to VIN
Device
CIN
C1
C2
COUT
TC1682
3.3
F
3.3
F
3.3
F
3.3
F
TC1683
1
F
1
F
1
F
1
F
TC1684
0.33
F
0.33
F
0.33
F
0.33
F
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