ADP1290ACBZ-R7 datasheet(11/12 Pages) AD

11 / 12 page

Data Sheet

ADP1290

TIMING

Turn on delay is defined as the interval between the time that

VEN exceeds the rising threshold voltage and when VOUT rises to

~10% of its final value. The ADP1290 includes circuitry that has

a typical 250 μs turn on delay and a controlled rise time to limit

the VIN inrush current. As shown in Figure 24 and Figure 25,

the turn on delay is nearly independent of the input voltage.

CH1 2.00V BW

CH3 100mAΩ BW

CH2 2.00V BW M400µs

A CH4

1.04V

T 10.40%

INPUT CURRENT

OUTPUT

Figure 24. Typical Turn On Time and Inrush Current, VIN = 2.5 V,

COUT = 10 μF, RLOAD = 100 Ω

CH1 2.00V BW

CH3

200mAΩ BW

CH2 5.00V BW M400µs

A CH4

1.04V

T 10.40%

INPUT CURRENT

OUTPUT

Figure 25. Typical Turn On Time and Inrush Current, VIN = 6.5 V,

COUT = 10 μF, RLOAD = 100 Ω

The rise time is defined as the time it takes the output voltage

to rise from 10% to 90% of VOUT reaching its final value. The turn

on delay is dependent on the rise time of the internal charge pump.

For very large values of output capacitance, the RC time constant

(where C is the load capacitance, CLOAD, and R is the RDSON||RLOAD)

can become a factor in the rise time of the output voltage. Because

RDSON is much smaller than RLOAD, an adequate approximation for

RC is RDSON × CLOAD. An input or load capacitor is not required for

the ADP1290; however, capacitors can suppress noise on the board.

The turn off time is defined as the time it takes for the output

voltage to fall from 90% to 10% of VOUT reaching its final value. The

turn off time is also dependent on the RC time constant of the

output capacitance (CLOAD) and load resistance (RLOAD).

Figure 26 and Figure 27 show the typical turn off times with

VIN = 6.5 V, COUT = 10 μF and 100 μF, and RLOAD = 100 Ω.

CH1 2.00V BW CH2 2.00V BW M400µs

A CH4

1.04V

T 10.40%

OUTPUT

Figure 26. Typical Turn Off Time, COUT = 10 μF, RLOAD = 100 Ω

CH1 1.00V BW CH2 2.00V BW M400µs

A CH4

1.08V

T 10.40%

OUTPUT

Figure 27. Typical Turn Off Time, COUT = 100 μF, RLOAD = 100 Ω

CURRENT AND THERMAL OVERLOAD

PRECAUTIONS

The ADP1290 is not protected against damage due to excessive

power dissipation and does not have thermal overload protection

circuits. To prevent permanent damage, never allow current

through the ADP1290 to exceed its rated value for more than a

few milliseconds. Permanent damage can also occur if the

output is shorted to ground

THERMAL CONSIDERATIONS

To guarantee reliable operation, the junction temperature of the

ADP1290 must not exceed 105°C. To ensure that the junction

temperature stays below this maximum value, the user must be

aware of the parameters that contribute to junction temperature

changes. These parameters include ambient temperature, power

dissipation in the power device, and thermal resistances between

the junction and ambient air (θJA). The θJA number is dependent

on the package assembly and the amount of copper used to solder

the package pins to the PCB.

Rev. 0 | Page 11 of 12

ADP1290ACBZ-R7 数据表(PDF) 11 Page - Analog Devices

ADP1290ACBZ-R7 数据表(HTML) 11 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

数据表下载

链接网址

ADP1290ACBZ-R7 数据表(PDF) 11 Page - Analog Devices

ADP1290ACBZ-R7 数据表(HTML) 11 Page - Analog Devices

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12

数据表 下载

链接网址

数据表下载