MAX5901ACEUT-T datasheet(7/14 Pages) MAXIM

Part #	MAX5901ACEUT-T

Description	-100V, SOT23/TDFN, Simple Swapper Hot-Swap Controllers

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Manufacturer	MAXIM [Maxim Integrated Products]

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Turn-On and Turn-Off Delays

After power is applied, or ON/OFF is released, there is

a 300ms delay (tON) before the gate ramp is started.

This delay is also the automatic restart time delay.

In the event of a circuit-breaker condition or an over-

temperature fault condition, the turn-off delay is less

than 2µs. An undervoltage condition must exist for at

least 20ms (tOFF) before the MAX5900/MAX5901 turn

off the external MOSFET. ON/OFF must be held low for

at least 20ms (tOFF) before the MAX5900/MAX5901 turn

off the external MOSFET. Turn-off delay minimizes spu-

rious shutdowns due to noisy signals or momentary

voltage spikes, as well as preventing accidental

resetting of the circuit-breaker latch (MAX5900L/

MAX5901L).

Thermal Shutdown

A thermal shutdown feature helps protect the external

MOSFET. If the die temperature of the MAX5900/

MAX5901 exceeds +125°C, the MOSFET is turned off.

For accurate performance, the MAX5900/MAX5901

must be in close thermal contact with the external

MOSFET (see the Layout Guidelines section). Due to

the low power dissipation of the MAX5900/MAX5901, its

junction temperature will typically be within a few

degrees of the MOSFET. All versions of the MAX5900/

MAX5901 automatically restart from a temperature fault

when the junction temperature drops below +110°C.

Undervoltage Lockout

The MAX5900/MAX5901 turn off the external MOSFET if

the magnitude of the input voltage is below the level set

by ON/OFF for longer than 20ms (tOFF). If ON/OFF is

left unconnected, the lockout voltage (VUVLO) defaults

to -31.5V. VUVLO may also be set to any value within

the power-supply range by using external resistors. To

set the lockout voltage to a value between -9V and

-100V, use a resistor-divider connected between GND

and VEE, with the center node of the divider connected

to ON/OFF. For example, use a 3k

Ω resistor (R1 in

Figure 2) from ON/OFF to VEE and calculate the other

resistor, R2, using:

where VUVLO is the desired lockout voltage, and

VON/OFF is the ON/OFF reference threshold specified in

the Electrical Characteristics table (typically 1.26V).

Figure 2 shows an example circuit with VUVLO set for

-20V. To defeat the UVLO, simply connect a single 100k

Ω

resistor between ON/OFF and GND, as shown in Figure 4.

RR

VUVLO

21

126

1

=×

−

⎛

⎝⎜

⎞

⎠⎟

.

-100V, SOT23/TDFN, Simple Swapper

Hot-Swap Controllers

_______________________________________________________________________________________

7

HOT-SWAP CONTROLLER

OPTIONAL

-48V

VEE

GND

R2

47k

Ω

R1

3k

Ω

MAX5900

GND

ON/OFF

MAX5901

DGND

HOT-SWAP CONTROLLER #1

VEE

GND

C

2C

MAX5900

GND

ON/OFF

HOT-SWAP CONTROLLER #2

VEE

GND

ON/OFF

MAX5901

MAX5900

MAX5901

Figure 2. Programmed -20V Lockout With Optional

Optocoupler On/Off Control

Figure 3. Power-Supply Sequencing

Figure 4. Defeating Undervoltage Lockout

HOT-SWAP CONTROLLER

-48V

VEE

GND

100k

Ω

MAX5900

GND

ON/OFF

MAX5901

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MAX5901ACEUT-T Datasheet(PDF) 7 Page - Maxim Integrated Products

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