Pin description (continued) – Rainbow Electronics MAX15011 User Manual

Page 11

MAX15009/MAX15011

Automotive 300mA LDO Regulators with

Switched Output and Overvoltage Protector

______________________________________________________________________________________

Pin Description (continued)

NAME

PIN

MAX15009

MAX15011

FUNCTION

FB_LDO

LDO Voltage Feedback Input. Connect FB_LDO to SGND to select the preset +5V
output voltage. Connect FB_LDO to an external resistive voltage-divider for adjustable
output operation. See the Setting the Output Voltage section.

EN_LDO

Active-High LDO Enable Input. Connect EN_LDO to IN or to a logic-high voltage to
turn on the regulator. To place the LDO in shutdown, pull EN_LDO low or leave
unconnected and leave

HOLD unconnected. EN_LDO is internally pulled to SGND

through a 1µA current sink. See the Control Logic section.

EN_SW

Active-High Switch Enable Input. Connect EN_SW to IN or to a logic-high voltage to
turn on the switch. Pull EN_SW low or leave unconnected to place the switch in
shutdown. EN_SW is internally pulled to SGND through a 1µA current sink.

EN_PROT

—

Protector Enable Input. Drive EN_PROT low to force GATE low and turn off the external
n-channel MOSFET. EN_PROT is internally pulled to SGND by a 1µA sink current.
Connect EN_PROT to IN for normal operation.

19, 20

Regulator Input. Bypass IN to SGND with a 10µF capacitor with an ESR < 1.5

Ω.

21, 22

OUT_LDO

LDO Regulator Output. Bypass OUT_LDO to SGND with a ceramic capacitor with a
minimum value of 22µF. OUT_LDO has a fixed 5V output or can be adjusted from1.8V
to 11V. See the Setting the Output Voltage section.

OC_DELAY

Switch Overcurrent Blanking Time Programming Input. Leave OC_DELAY
unconnected to select the minimum delay timeout before turning the switch off.
OC_DELAY is internally pulled to SGND through a 1µA current source. See the
Programming the Switch Overcurrent Blanking Time section.

ILIM

Switch Current-Limit Set Input. Connect a 10k

Ω to 200kΩ resistor from ILIM to SGND to

select the current limit for the internal switch. Connect ILIM to OUT_LDO to select the
internal 170mA (min) current-limit threshold. Do not leave ILIM unconnected. See the
Setting the Switch Current Limit section.

HOLD

Active-Low Hold Input. If EN_LDO is high when

HOLD is forced low, the regulator

latches the state of the EN_LDO input and allows the regulator to remain turned on
when EN_LDO is subsequently pulled low. To shut down the regulator, release

HOLD

after EN_LDO is pulled low. If

HOLD functionality is unused, connect HOLD to

OUT_LDO or leave unconnected.

HOLD is internally pulled up to OUT_LDO through a

0.6µA current source. See the Control Logic section.

27, 28

OUT_SW

Switch Output. Bypass OUT_SW to SGND with a minimum 0.1µF ceramic capacitor.

—

Exposed Pad. Connect EP to SGND plane. EP also functions as a heatsink to maximize
thermal dissipation. Do not use as the main ground connection.