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參數(shù)資料
| 型號(hào)： | CAT3200-5 |
| 元件分類： | DC/DC變換器 |
| 英文描述： | Low Noise Regulated Charge Pump DC-DC Converter |
| 中文描述： | 低噪聲穩(wěn)壓電荷泵DC - DC轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 148K |
| 代理商： | CAT3200-5 |
CAT3200/3200-5
7
Doc. No. 5002, Rev. E
Figure 1: Programming the Adjustable CAT3200
Typical values for total voltage divider resistance can
range from several k
s up to 1M
.
OUT
FB
PGND
SGND
VOUT
1.27V
COUT
R1
R2
( )
1 + R1
R2
8
7
4
5
CPOS CNEG
IN
SHDN
3
2
6
1
DEVICE OPERATION
The CAT3200/CAT3200-5 use a switched capacitor
charge pump to boost the voltage at IN to a regulated
output voltage. Regulation is achieved by sensing the
output voltage through an internal resistor divider
(CAT3200-5) and modulating the charge pump output
current based on the error signal. A 2-phase non-
overlapping clock activates the charge pump switches.
The flying capacitor is charged from the IN voltage on the
first phase of the clock. On the second phase of the clock
it is stacked in series with the input voltage and connected
to OUT. The charging and discharging the flying capacitor
continues at a free running frequency of typically 2MHz.
In shutdown mode all circuitry is turned off and the
CAT3200/CAT3200-5 draw only leakage current from
the V
IN
supply. OUT is disconnected from IN. The
SHDN
pin is a CMOS input with a threshold voltage of
approximately 0.8V. The CAT3200/CAT3200-5 is in
shutdown when a logic LOW is applied to the
SHDN
pin.
The
SHDN
pin is a high impedance CMOS input.
SHDN
does not have an internal pull-down resistor and should
not be allowed to float and. It must always be driven with
a valid logic level.
Short-Circuit and Thermal Protection
The CAT3200 and CAT3200-5 have built-in short-circuit
current limiting and over temperature protection. During
overload conditions, output current is limited to
approximately 225mA. At higher temperatures, or if the
input voltage is high enough to cause excessive chip self
heating, the thermal shutdown circuit shuts down the
charge pump as the junction temperature exceeds
approximately 160
°
C. Once the junction temperature
drops back to approximately 140
°
C, the charge pump is
enabled. The CAT3200and CAT3200-5 will cycle in and
out of thermal shutdown indefinitely without latch-up or
damage until a short-circuit on OUT is removed.
Programming the CAT3200 Output Voltage (FB Pin)
The CAT3200-5 version has an internal resistive divider
to program the output voltage. The programmable
CAT3200 may be set to an arbitrary voltage via an
external resistive divider. Since it employs a voltage
doubling charge pump, it is not possible to achieve
output voltages greater than twice the available input
voltage. Figure 1 shows the required voltage divider
connection. The voltage divider ratio is given by the
formula:
R
R
V
.
V
OUT
1
2
1 27
1
=
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