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参数资料
| 型号： | TC3684EUART |
| 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： | 4/7页 |
| 文件大小： | 960K |
| 代理商： | TC3684EUART |
4
TC3682
TC3683
TC3684
Inverting Charge Pump Voltage
Doublers with Active Low Shutdown
TC3682/3/4-1 8/14/00
2001 Microchip Technology Inc.
DS21556A
Input Supply Bypassing
TheVIN input should be capacitively bypassed to reduce
AC impedance and minimize noise effects due to the internal
switching in the device. 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 TC3682, TC3683 and TC3684 are enabled when
SHDN is high, and disabled when SHDN is low. 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 TC3682/3683/
3684 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.
Figure 2. Dual Voltage Inverter Test Circuit
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.
TC3682 Demo Card
The TC3682 DEMO Card is a 2.0” x 2.0” card containing
both a TC3682 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.
Figure 3 is a schematic of the TC3682 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.
C1
C2
V
IN
C
IN
V
OUT
R
L
V
IN
C
OUT
–2V
IN
TC3682
TC3683
TC3684
C1–
SHDN
C2–
2
1
7
6
8
4
5
3
C1+
C2+
GND
Device
CIN
C1
C2
COUT
TC3682
3.3
F 3.3F
3.3
F
3.3
F
TC3683
1
F
1
F
1
F
1
F
TC3684
0.33
F 0.33F 0.33F 0.33F
Table 3. TC3682 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
TC3682 (U2) SUPPLY VOLTAGE
TP7
TC3682 (U2) OUTPUT VOLTAGE [VOUT2]
TP8
TC3682 (U2) SHDN INPUT VOLTAGE
TP9
DEMO CARD /SHUTDOWN INPUT
Table 4. TC3682 DEMO Card Jumpers
JUMPER
CURRENT MEASUREMNT
J1
TC682 (U1) QUIESCENT CURRENT
J2
TC3682 (U2) QUIESCENT CURRENT
J3
TC682 (U1) VOUT1 LOAD CURRENT
J4
TC3682 (U2) VOUT2 LOAD CURRENT
J5
TC3682 (U2) SHDN INPUT CURRENT
J6
CONNECT DEMO CARD /SHUTDOWN
INPUT TO GND
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