Datasheet

PIN NAME FUNCTION
10 PG
Power Status Output. Open-drain output that is normally pulled high by a 10µA current source to a
diode below V
S
. PG can be pulled above V
S
using an external pullup. PG pulls low when the MOSFET
gate drive between GATE and OUT exceeds the gate-to-source volt age of 4.2V and V
OUT
is greater
than 90% of V
CSP
. Leave PG unconnected if unused.
11 FAULT
Fault Status Output. Open-drain output that is normally pulled high by a 10µA current source to a diode
below V
S
. FAULT can be pulled above V
S
using an external pullup. FAULT pulls low when the circuit
breaker is tripped after an overcurrent fault timeout. Leave FAULT unconnected if unused.
12 PC
Priority Control Input. When low, it enables the external ideal diode MOSFET in the IN2 supply path
and a high turns it off. Connect PC to an external resistive divider from IN1 to make IN1 the higher
priority input supply when IN1 and IN2 are equal. Connect PC to GND if not used.
13 CDLY
Timer Capacitor Terminal. Connect a capacitor between CDLY and GND to set 12ms/µF duration for
current limit before the external hot-swap MOSFET is turned off. The duration of the off-time is 600ms/
µF, resulting in a 2% duty cycle.
14 EN
Enable Input. Connect EN to GND to enable hot-swap control. If EN is pulled high, the hot-swap
MOSFET is not allowed to turn on. A 10µA current source pulls up EN to a diode below V
S
. Upon EN
going low when ON is high, an internal timer provides a 100ms startup delay for debounce, after which
the fault is cleared.
15 ON
On Control Input. When above 1.2V, it turns on the external hot-swap MOSFET and when below
1.1V, it turns it off. Connect ON to an external resistive divider from CSP to monitor the supply
undervoltage condition. Pulling voltage of ON pin below 0.6V resets the electronic circuit
breaker.
16 CB
Current-Limit Threshold Setting. Connect the CB pin to V
S
, GND, or leave CB unconnected to set the
circuit-breaker threshold. See Table 1 for details.
17 OUT Load Output. Connect OUT to the source of the external hot-swap MOSFET.
18 GATE
Hot-Swap MOSFET Gate Drive Output. Connect this pin to the gate of the external n-channel
MOSFET for hot-swap control. An internal 10µA current source charges the MOSFET gate. An internal
clamp limits the gate voltage to 11V above OUT and a diode voltage below OUT. During turn-off, a
500µA pulldown current discharges GATE to ground. During an output short to ground, a fast 200mA
pulldown current discharges GATE to OUT.
19 CP1
Charge Pump 1 Output. Connect a capacitor from CP1 to IN1 pin. The value of this capacitor should
be 10x or greater than the gate capacitance of the external MOSFET for ideal diode control. The
charge stored on this capacitor is used to pull up the gate during a fast turn-on.
20 OG1
ORing MOSFET 1 Gate Control Output. Connect OG1 to the gate of an external n-channel MOSFET
for ideal diode control. The gate voltage is set to approximately 11V above and a diode voltage below
IN1. During fast turn-on, a 1A pullup switch charges OG1 from CP1. During fast turn-off, a 3A pulldown
switch discharges OG1 to IN1.
— EP
Exposed Pad. Connect EP to the ground plane to provide a low thermal resistance path from the IC
junction to the PCB. Do not use EP as an electrical connection to GND.
MAX15068 Dual ORing, Single Hot-Swap Controller with
Accurate Current Monitoring
www.maximintegrated.com
Maxim Integrated │ 10
Pin Description (continued)