MIC2007YML datasheet(20/25 Pages) MICREL

20 / 25 page

Micrel, Inc.

MIC20XX Family

January 2009

M9999-012109-A

Figure 5. IOUT in Current Limiting for VIN

- VOUT > 1V

This folding back of ILIMIT can be generalized by plotting

ILIMIT as a function of VOUT, as shown below in Figures 6

and 7. The slope of VOUT between IOUT = 0V and IOUT =

ILIMIT (where ILIMIT = 1A) is determined by RON of the

switch and ILIMIT.

0.2

0.4

0.6

0.8

1.0

1.2

OUTPUT VOLTAGE (V)

Normalized Output Current

vs. Output Voltage (5V)

Figure 6.

0.2

0.4

0.6

0.8

1.0

1.2

0.5 1.0

1.5

2.0

2.5 3.0

OUTPUT VOLTAGE (V)

Normalized Output Current

vs. Output Voltage (2.5V)

Figure 7.

CSLEW

2003

2004

2005

2006

2007

2008

2009

2013

2014

2015

2016

2017

2018

2019

Only parts in white boxes have CSLEW pin.

(Not available in 5-pin SOT-23 packages).

The CSLEW pin is provided to increase control of the

output voltage ramp at turn-on. This input allows

designers the option of decreasing the output’s slew rate

(slowing the voltage rise) by adding an external

capacitance between the CSLEW and VIN pins. This

capacitance slows the rate at which the pass FET gate

voltage increases and thus, slows both the response to

an Enable command as well as VOUT’s ascent to its final

value.

Figure 8 illustrates effect of CSLEW on turn-on delay and

output rise time.

0.002

0.004

0.006

0.008

0.01

0.012

0.014

00 00 00 00 00

CSLEW (nF)

Typical Turn-on Times

vs. External C

SLEW

Capacitance

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

RISE

DELAY

Figure 8.

CSLEW’s effect on ILIMIT

unavoidable

consequence

adding

CSLEW

capacitance is a reduction in the MIC20X5 – 20X8’s

ability to quickly limit current transients or surges. A

sufficiently large capacitance can prevent both the

primary and secondary current limits from acting in time

to prevent damage to the MIC20X5 – 20X8 or the

system from a short circuit fault. For this reason, the

upper limit on the value of CSLEW is 4nF.

Variable Under Voltage Lock Out (VUVLO)

2003

2004

2005

2006

2007

2008

2009

2013

2014

2015

2016

2017

2018

2019

Only parts in white boxes have VUVLO pin and functionality.

Power conscious systems, such as those implementing

ACPI, will remain active even in their low power states

and may require the support of external devices through

both phases of operation. Under these conditions, the

current allowed these external devices may vary

according to the system’s operating state and as such

MIC2007YML Datasheet(PDF) 20 Page - Micrel Semiconductor

MIC2007YML Datasheet(HTML) 20 Page - Micrel Semiconductor

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25

Datasheet Download

Link URL