Automotive 300mA LDO Regulators with

Switched Output and Overvoltage Protector

10

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Pin Description

NAME

PIN

MAX15009

MAX15011

FUNCTION

1–4, 8, 11,

14, 26, 29–32

N.C.

—

1–4, 8,

10–14, 18,

26, 29–32

—

N.C.

No Connection. Not internally connected.

5

SGND

SGND

Signal Ground

6

PGND

PGND

Ground. PGND is also the return path for the overvoltage protector pulldown current

for the MAX15009. In this case, connect PGND to SGND at the negative terminal of the

bypass capacitor connected to the source of the external MOSFET. For the

MAX15011, connect PGND to SGND together to the local ground plane.

7

RESET

RESET

Active-Low Open-Drain Reset Output. RESET is low while OUT_LDO is below the reset

threshold. Once OUT_LDO has exceeded the reset threshold, RESET remains low for

the duration of the reset timeout period then goes high.

9CT

CT

the reset timeout period. See the Setting the RESET Timeout Period section.

10

FB_PROT

—

Overvoltage-Threshold Adjustment Input. Connect FB_PROT to an external resistive

voltage-divider network to adjust the desired overvoltage threshold. Use FB_PROT to

monitor a system input or output voltage. See the Setting the Overvoltage Threshold

(MAX15009 Only) section.

12

GATE

—

Protector Gate Drive Output. Connect GATE to the gate of an external n-channel

MOSFET. GATE is the output of a charge pump with a 45µA pullup current to 8.1V

(typ) above IN during normal operation. GATE is quickly turned off through a 63mA

internal pulldown during an overvoltage condition. GATE then remains low until

FB_PROT has decreased below 96% of the overvoltage threshold. GATE pulls low

when EN_PROT is low.

13

SOURCE

—

Output-Voltage Sense Input. Connect SOURCE to the source of the external n-channel

MOSFET.