Datasheet

MAX5938
-48V Hot-Swap Controller with V
IN
Step Immunity,
No R
SENSE
, and Overvoltage Protection
4 _______________________________________________________________________________________
Note 1: All currents into pins are positive and all currents out of pins are negative. All voltages referenced to V
EE
, unless otherwise
specified.
Note 2: All limits are 100% tested at +25°C and +85°C. Limits at -40°C and -10°C are guaranteed by characterization.
Note 3: V
ON
drops below the V
ON_REF,F
threshold are ignored during this time.
Note 4: Delay time from a valid on condition until the load-probe test begins.
Note 5: The short-circuit threshold is V
SC
= 2 x V
CB
.
Note 6: The time when PGOOD condition is met until PGOOD signal is asserted.
Typical Operating Characteristics
(V
EE
= -48V, GND = 0V, V
IN
= GND - V
EE
, POL_SEL = floating, all voltages are referenced to V
EE
, unless otherwise noted. T
A
= +25°C,
unless otherwise noted.)
SUPPLY CURRENT
vs. INPUT VOLTAGE
MAZ5938 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)
706040 503020
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
0
10 80
SUPPLY CURRENT
vs. TEMPERATURE
MAX5938 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
603510-15
0.2
0.4
0.6
0.8
1.0
1.2
0
-40 85
V
IN
= 72V
V
IN
= 48V
V
IN
= 12V
GATE-DRIVE VOLTAGE
vs. INPUT VOLTAGE
MAX5938 toc03
INPUT VOLTAGE (V)
GATE DRIVER VOLTAGE (V)
706040 503020
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
6.0
10 80
ELECTRICAL CHARACTERISTICS (continued)
(V
EE
= -10V to -80V, V
IN
= (GND - V
EE
), V
STEP_MON
=V
EE
, R
LP
= 200Ω, V
ON
= V
OFF
= 2V, V
OV
= V
CB_ADJ
= V
EE
, POL_SEL open, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at V
EE
= -48V, T
A
= +25°C.) (Notes 1, 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOGIC AND FAULT MANAGEMENT
Autoretry Delay t
RETRY
16 x
t
LP
s
|V
OUT
- V
EE
| falling
0.74
x V
CB
PGOOD Assertion Threshold
Hysteresis
0.26
x V
CB
mV
PGOOD Assertion Delay Time
(Note 6)
t
PGOOD
0.70 1.26 1.85
ms
PGOOD Low Voltage V
OL
I
SINK
= 1mA, referenced to V
OUT,
V
OUT
< (GND - 5V )
0.05
0.4 V
PGOOD Open-Drain Leakage I
L
V
EE
= -80V, PGOOD = GND
0.01
1µA