MAX5902(2002) Ver la hoja de datos (PDF) - Maxim Integrated
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Fabricante
MAX5902 Datasheet PDF : 11 Pages
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+72V SOT23 Simple Swapper Hot-Swap
Controllers
necting the load immediately. If no circuit breaker fault
exists, the MAX5902/MAX5903 assert the power-good
output. Then, if any of four conditions exist, the power
good output deasserts and the MAX5902/MAX5903
turn off the MOSFET. The four conditions are: the volt-
age across the MOSFET exceeds the circuit breaker
threshold; the supply voltage falls below the undervolt-
age lockout level; the die temperature exceeds
+125°C; or ON/OFF is forced low. After a circuit break-
er fault, the MAX5902L/MAX5903L keep the MOSFET
off until the power is cycled, or the part is reset by tog-
gling ON/OFF low for 10ms (typ). After a circuit breaker
fault, the MAX5902A/MAX5903A automatically restarts
in 150ms (typ). All versions automatically restart after a
thermal fault, or an undervoltage shutdown, if the fault
condition goes away for at least 150ms (typ).
ON/OFF offers external control of the MAX5902/
MAX5903, facilitating power-supply sequencing, and
may also be used to change the undervoltage lockout
(UVL) level. UVLO keeps the external MOSFET
switched off as long as the input voltage is below the
desired level.
A power good output, PGOOD (MAX5902) or PGOOD
(MAX5903), asserts when the external MOSFET is fully
enhanced and the source-drain voltage is below the
circuit breaker threshold. PGOOD and PGOOD are
open-drain outputs referenced to GND, and can with-
stand up to +72V.
VS GATE DRAIN
VIN V
MAX5902
48V
ON/OFF
PGOOD
GND
I
(a) SUPPLY CURRENT
V
VIN
VS GATE DRAIN
MAX5902
50kΩ
48V
ON/OFF
PGOOD
GND
V
(b) VUVLO
50kΩ
VS
GATE DRAIN
MAX5902A
ON/OFF
PGOOD
GND
0 TO 0.5V
SCOPE
SCOPE
(d) RETRY TIMEOUT
IRFR5410
VS
GATE
DRAIN
MAX5902
ON/OFF
PGOOD
GND
SCOPE
SCOPE
RL CL
SCOPE
SCOPE
(d) STARTUP WAVEFORMS
VS GATE DRAIN
V
MAX5902
V
VIN
ON/OFF
PGOOD
GND
SCOPE
50Ω
SCOPE
VS
GATE
DRAIN
48V
50kΩ
MAX5902
ON/OFF
PGOOD
GND
SCOPE
(b) GATE DRIVE VOLTAGE
(d) CIRCUIT BREAKER EVENT
Figure 2. Test Circuits
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