Datasheet > CAT3200_07

CAT3200_07

更新时间： 2022-04-23 23:00:11

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Low Noise Regulated Charge Pump DC-DC Converter

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CAT3200_07 数据手册

CAT3200/3200-5

APPLICATION INFORMATION

Ceramic Capacitors

Ceramic capacitors of different dielectric materials lose

theircapacitancewithhighertemperatureandvoltageat

different rates. For example, a capacitor made of X5R or

X7R material will retain most of its capacitance from –

40°C to 85°C whereas a Z5U or Y5V style capacitor will

lose considerable capacitance over that range.

The overall junction to ambient thermal resistance (θ_JA)

for device power dissipation (P_D) consists primarily of

two paths in series. The first path is the junction to the

case (θ_JC) which is defined by the package style, and the

second path is case to ambient (θ_CA) thermal resistance

which is dependent on board layout. The final operating

junction temperature for any set of conditions can be

estimated by the following thermal equation:

T_JUNC= T_AMB+ P (Θ_JC) + P (Θ_CA)

Z5UandY5Vcapacitorsmayalsohavevoltagecoefficient

causing them to lose 60% or more of their capacitance

when the rated voltage is applied. When comparing

differentcapacitorsitisoftenusefulconsidertheamount

of achievable capacitance for a given case size rather

than discussing the specified capacitance value. For

example,overratedvoltageandtemperatureconditions,

a 1µF, 10V, Y5V ceramic capacitor in an 0603 case may

not provide any more capacitance than a 0.22µF, 10V,

X7R available in the same 0603 case. For many

CAT3200/CAT3200-5applicationsthesecapacitorscan

be considered roughly equivalent.

= T_AMB+ P (Θ_JA)

The CAT3200 in SOT23 package, when mounted on

printed circuit board with two square inches of copper

allocated for “heat spreading”, will result with an overall

θ_JAof less than 150°C/W.

For a typical application operating from a 3.8V input

supply, the maximum power dissipation is 260mW

(100mA x 3V). This would result if a maximum junction

temperature of :

The capacitor manufacturer’s data sheet should be

consultedtodeterminewhatvalueofcapacitorisneeded

to ensure the desired capacitance at all temperatures

and voltages. Below is a list of ceramic capacitor

manufacturers and how to contact them:

JUNC = TAMB + P (θJA)

= 85°C + 0.26W (150°C/W)

= 85°C + 39°C = 124°C

The use of multi-layer board construction with power

planes will further enhance the overall thermal

performance. In the event of no dedicated copper area

being used for heat spreading, a multi-layer board will

typically provide the CAT3200 with an overall θ_JAof

200°C/W. This level of thermal conduction would allow

up to 200mW be safely dissipated within the device.

Capacitor

Manufacturer Web

Phone

Murata

www.murata.com

814.237.1431

843.448.9411

AVX/Kemet

Vishay

www.avxcorp.com

www.vishay.com

www.kemet.com

Kemet

408.986.0424

408.573.4150

Taiyo Yuden www.t-yuden.com

Thermal Management

For higher input voltages and maximum output current

there can be substantial power dissipation in the

CAT3200/CAT3200-5. If the junction temperature

increases to 160°C, the thermal shutdown circuitry will

automatically turn off the output.

A good thermal connection to the PC board is

recommended to reduce the chip temperature.

ConnectingtheGNDpin(Pins4/5forCAT3200,Pin2for

CAT3200-5) to a ground plane, and maintaining a solid

ground plane under the device reduces the overall

thermal resistance.

Characteristics subject to change without notice

Doc. No. MD-5002, Rev. L

1...5 6 789 10 11 12

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CAT3200ZI-GT3	ONSEMI	Low Noise Regulated Charge Pump DC-DC Converter	获取价格
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CAT3200ZI-TE13	CATALYST	Low Noise Regulated Charge Pump DC-DC Converter	获取价格
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