Datasheet > CAT3200_05

CAT3200_05

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
CATALYST		转换器泵
页数	文件大小	规格书
12页	558K
描述
Low Noise Regulated Charge Pump DC-DC Converter

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CAT3200_05 数据手册

CAT3200/3200-5

Typical values for total voltage divider resistance can

range from several kΩs up to 1MΩ.

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.

TheflyingcapacitorischargedfromtheINvoltageonthe

firstphaseoftheclock. Onthesecondphaseoftheclock

itisstackedinserieswiththeinputvoltageandconnected

toOUT.Thecharginganddischargingtheflyingcapacitor

continues at a free running frequency of typically 2MHz.

CNEG

CPOS

OUT

1 +

1.27V

( )

FB ⁷

OUT

PGND ⁴

SGND ⁵

SHDN

In shutdown mode all circuitry is turned off and the

CAT3200/CAT3200-5 draw only leakage current from

the V_INsupply. 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.

Figure 1: Programming the Adjustable CAT3200

Short-Circuit and Thermal Protection

TheCAT3200andCAT3200-5havebuilt-inshort-circuit

current limiting and over temperature protection. During

overload conditions, output current is limited to

approximately 225mA. At higher temperatures, or if the

inputvoltageishighenoughtocauseexcessivechipself

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:

OUT

− 1

R2 1.27V

Characteristics subject to change without notice

Doc No. 5002, Rev. K

1...4 5 678 9 10...12

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