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参数资料
| 型号： | TC3684EUA |
| 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： | 6/10页 |
| 文件大小： | 229K |
| 代理商： | TC3684EUA |
2005 Microchip Technology Inc.
DS21556C-page 5
TC3682/TC3683/TC3684
4.0
APPLICATIONS INFORMATION
4.1
Output Voltage Considerations
The
TC3682/TC3683/TC3684
perform
inverting
voltage conversions but do not provide any type of
regulation. The output voltage will droop in a linear
manner with respect to the output load current. The
value of the equivalent output resistance of the ‘-VIN’
output is approximately 50
Ω nominal at +25°C and
VIN = +5V. The value of the ‘-2VIN’ output is approxi-
mately 140
Ω nominal at +25°C and VIN = +5V. In this
particular case, ‘-VIN’ is approximately -5V and ‘-2VIN’
is approximately -10V at very light loads and each
stage will droop according to the equation below:
VDROOP = IOUT x ROUT
4.2
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C1
and C2 will lower the output resistance and larger
values of COUT will reduce output ripple.
Note:
For proper charge pump operation, C1
must have a voltage rating greater than or
equal to VIN, while C2 and COUT must have
a voltage rating greater than or equal to
2VIN.
Table 4-1 shows various values of C1/C2 and the
corresponding output resistance values for VIN = 5V
@ +25°C.
Table 4-2 shows the output voltage ripple for various
values of COUT (again assuming VIN = 5V @ +25°C).
The VRIPPLE values assume a 1mA output load current
and a 0.1
Ω ESRCOUT.
TABLE 4-1:
OUTPUT RESISTANCE
VS. C1/C2 (ESR = 0.1
Ω)
TABLE 4-2:
OUTPUT VOLTAGE RIPPLE
VS. COUT (ESR = 0.1Ω)
IOUT = 1mA
4.3
Input Supply Bypassing
The VIN input should be capacitively bypassed to
reduce AC impedance and minimize noise effects due
to
the
switching
internal
to
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.
4.4
Shutdown Input
The TC3682/TC3683/TC3684 is 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/TC2683/TC2684 data sheet.) The SHDN
input should be limited to 0.3V above VIN.
4.5
Inverting Voltage Doubler
The most common application for the TC3682/TC3683/
TC3684 devices is the inverting voltage doubler
(Figure 4-1). This application uses three external
capacitors: C1, C2 and COUT.
Note:
A
power
supply
bypass
capacitor
is
recommended.
The output is equal to -2VIN plus any voltage drops due
capacitor selection guidelines.
FIGURE 4-1:
INVERTING VOLTAGE
DOUBLER TEST CIRCUIT
4.6
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.
C1, C2
(
μF)
TC3682
ROUT(Ω)
TC3683
ROUT(Ω)
TC3684
ROUT(Ω)
0.33
633
184
120
1
262
120
102
3.3
120
95
84
COUT
(
μF)
TC3682
VRIPPLE
(mV)
TC3683
VRIPPLE
(mV)
TC3684
VRIPPLE
(mV)
0.33
192
60
27
1
632116
3.3
17
8
7
C1
C2
VIN
CIN
VOUT
RL
VIN
COUT
TC3682
TC3683
TC3684
C1–
C2–
2
1
7
6
8
4
5
3
C1+
C2+
GND
+
Device
CIN
C1
C2
COUT
TC3682
3.3
μF
3.3
μF
3.3
μF
3.3
μF
TC3683
1
μF
1
μF
1
μF
1
μF
TC3684
0.33
μF
0.33
μF
0.33
μF
0.33
μF
SHDN
-2VIN
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