Datasheet

Typical Operating Characteristics (continued)
(V
IN
= 48V, VDIG, EN, LATCH, CLASS, ZC_EN = 3.3V, DCA, AGND_S = AGND = DGND = 0V, R
SENSE
= 0.5Ω, UVLO floating,
T
A
= +25°C, unless otherwise noted.)
OUTPUT SHORT-CIRCUIT RESPONSE
MAX5923 toc23
200µs/div
200mA/div
20V/div
V
OUT
I
OUT
MAX5923
+60V Simple Swapper Hot-Swap Switch
_______________________________________________________________________________________ 7
OUTPUT SHORT-CIRCUIT RESPONSE
MAX5923 toc22
4µs/div
10A/div
20V/div
V
OUT
I
OUT
PIN NAME FUNCTION
— AGND
Analog Ground. This is the return of analog power input. AGND can vary ±4V from DGND. AGND and
DGND must be connected together at a single point in the system.
1, 2 DRAIN
Drain connection for the integrated MOSFET. Connect a sense resistor, R
SENSE
, from DRAIN to IN.
These pins are also the current-sense resistor negative terminal. R
SENSE
sets the overcurrent-limit
and open-circuit detection threshold. These two pins must be connected together.
3IN
Input Voltage. Connect to a positive voltage source between 16V to 60V from IN to AGND. This is the
current-sense resistor positive terminal. Bypass to AGND with a 100µF, 100V electrolytic capacitor
and 0.1µF, 100V ceramic capacitor. Place the ceramic capacitor close to this pin.
4, 12, 18, 19 N.C.
No Connection. Not internally connected. Leave pins open. Pins are left unconnected to provide
additional spacing between the high-voltage pins and other pins.
5 AGND_S
Analog Ground Sense. Connect a 1Ω resistor from AGND_S to AGND. This resistor protects the IC
during an output short-circuit condition.
6 UVLO
Undervoltage Lockout Adjustment Input. Referenced to AGND. Connect to the center point of a
resistive divider from IN to AGND to adjust the UVLO threshold. Leave open for default value.
7 FAULT
Fault Signal Open-Drain Logic Output. Reference to DGND. FAULT is latched low when:
• An overtemperature condition occurs and/or,
• An overcurrent condition that has lasted for more than t
OC
.
8 POK
Power-OK Open-Drain Logic Output. Reference to DGND. POK goes open drain a time t
POK_HIGH
after V
OUT
raises to within V
THPOK
from V
IN
. POK goes low a time t
POK_LOW
after V
OUT
falls out of the
V
THPOK
from V
IN
.
9 ZC
Zero-Current Fault Signal. Open-drain logic output. Reference to DGND. ZC is latched low when there
is a zero-current condition lasting longer than t
ZCDEL
. ZC is open drain otherwise. The zero-current
detection circuit is enabled immediately after the POK signal goes high.
10 TP1 Must be left open or connected to AGND
11 TP3 Must be left open or connected to AGND
Pin Description