Rainbow Electronics MAX15011 - Manual (Page 11)

MAX15009/MAX15011
Automotive 300mA LDO Regulators with
Switched Output and Overvoltage Protector
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Pin Description (continued)
NAME
PIN
MAX15009 MAX15011
FUNCTION
15 FB_LDO 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.
16 EN_LDO 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.
17 EN_SW 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.
18 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 IN IN Regulator Input. Bypass IN to SGND with a 10µF capacitor with an ESR < 1.5 Ω.
21, 22 OUT_LDO 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.
23 OC_DELAY 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.
24 ILIM 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.
25 HOLD 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 OUT_SW Switch Output. Bypass OUT_SW to SGND with a minimum 0.1µF ceramic capacitor.
— EP EP
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.