MAX5903LBETT 查看數據表（PDF） - Maxim Integrated

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MAX5903LBETT

+72V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers

Maxim Integrated 

+72V, SOT23/TDFN, Simple Swapper Hot-Swap

Controllers

MAX5902L/MAX5903L turn off the MOSFET, discon-

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

6 _______________________________________________________________________________________

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