Load

Transient

Line

Transient

NOM

~89%

~85%

Power

-Up

Power-

Down

~2.25V

~1.25V

~1.25V

~2.50V

~2.50V

Load

Transient

Line

Transient

NOM

~89%

~85%

Power-

Up

Power-

Down

~2.25V

~1.25V

~2.50V

LP38513

www.ti.com

SNVS361C – JULY 2007 – REVISED MARCH 2009

The internal ERROR flag comparator has an open drain output stage. Hence, the ERROR pin requires an

external pull-up resistor. The value of the pull-up resistor should be in the range of 2 k

Ω to 20 kΩ, and should be

connected to the LP38513 output voltage pin. The ERROR Flag pin should not be pulled-up to any voltage

the input voltage is less than typically 1.25V the status of the ERROR flag output will not be reliable. The

ERROR Flag pin must be connected to ground if this function is not used.

The timing diagram in Figure 23 shows the relationship between the ERROR flag and the output voltage when

the pull-up resistor is connected to the output voltage pin.

The timing diagram in Figure 24 shows the relationship between the ERROR flag and the output voltage when

the pull-up resistor is connected to the input voltage.

Figure 23. ERROR Flag Operation, see Typical Application Circuit

Copyright © 2007–2009, Texas Instruments Incorporated

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Product Folder Links: LP38513