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參數(shù)資料
| 型號： | TC2683EUA |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHED CAPACITOR CONVERTER, 45.5 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 3/6頁 |
| 文件大?。?/td> | 705K |
| 代理商： | TC2683EUA |
3
TC2682/3/4-1 8/14/00
TC2682
TC2683
TC2684
Inverting Charge Pump
Voltage Doublers
DETAILED DESCRIPTION
The TC2682, TC2683 and TC2684 charge pumps
perform –2x multiplication of the voltage applied to the VIN
pin. Conversion is performed using two synchronous switch-
ing matrices and three external capacitors.
Figure 1 (below) is a block diagram representation of the
TC2682, TC2683 and TC2684 architecture. The first switch-
ing stage inverts the voltage present at VIN and the second
stage uses ‘–VIN’ generated from the first stage to produce
the ‘–2x’ output function from the second stage switching
matrix.
Each device contains an on-board oscillator that syn-
chronously controls the operation of the charge pump switch-
ing matrices. The TC2682 synchronously switches at 12kHz,
the TC2683 synchronously switches at 35kHz, and the
TC2684 synchronously switches at 125kHz. The different
oscillator frequencies for this device family allow the user to
trade-off capacitor size versus supply current. Faster oscil-
lators can use smaller external capacitors, but will consume
more supply current (see Electrical Characteristics Table).
Figure 1. Functional Block Diagram
APPLICATIONS INFORMATION
Output Voltage Considerations
The TC2682, TC2683 and TC2684 perform inverting
voltage conversions but do not provide any type of regula-
tion. The output voltage will droop in a linear manner with
respect to the output load currents.
The value of the
equivalent output resistance is approximately 120
nominal
at +25
°C and VIN = +5V. In this particular case, the output is
approximately
–10V at very light loads, and will droop
according to the equation below:
VDROOP = IOUT x ROUT
VOUT = –2VIN
–VIN
+
COUT
VIN
SWITCH MATRIX
(1st STAGE)
SWITCH MATRIX
(2nd STAGE)
OSCILLATOR
C1
+
C2
+
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 1 shows various values of C1/C2 and the corre-
sponding output resistance values for VIN=5V @ +25°C.
Table 2 shows the output voltage ripple for various
values of COUT(again assuming VIN=5V @ +25oC). The
VRIPPLE values assume a 1mA output load current and a
0.1
ESRCOUT.
Table 1. Output Resistance vs. C1/C2 (ESR = 0.1
).
C1,C2
TC2682
TC2683
TC2684
(
F)
ROUT (
)
ROUT (
)
ROUT (
)
0.33
633
184
120
1
262
120
102
3.3
120
95
84
Table 2. Output Voltage Ripple vs. COUT (ESR = 0.1) IOUT = 1mA
COUT
TC2682 VRIPPLE
TC2683 VRIPPLE
TC2684 VRIPPLE
(
F)
(mV)
0.33
192
60
27
1.0
63
21
16
3.3
17
8
7
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|---|---|
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