MAX5948B

Allow Safe Board Insertion and Removal from a Live -48V Backplane
 Pin- and Function-Compatible with LT1640AL/LT1640L (MAX5948A)
Pin- and Function-Compatible with LT1640AH/LT1640H (MAX5948B)
Withstand -100V Input Transients with No External Components
 Operate from -20V to -80V
 Programmable Inrush and Short-Circuit Current Limits
 Programmable Overvoltage Protection
 Programmable Undervoltage Lockout
 Power Up into a Shorted Load
Power-Good Control Output

(All voltages are referenced to VEE, unless otherwise noted.)
Supply Voltage (V_DD - V_EE ) .................................-0.3V to +100V
PWRGD, PWRGD ..................................................-0.3V to +100V
DRAIN (Note 1)........................................................-2V to +100V
SENSE ....................................................................-0.3V to +20V
GATE (internally clamped) ......................................-0.3V to +18V
UV and OV..............................................................-0.3V to +60V
Current through SENSE ....................................................±20mA
Current into GATE...........................................................±300mA
Current into Any Other Pin................................................±20mA
Current into Drain.............................................-100mA to +20mA
Continuous Power Dissipation (T_A = +70°C)
    8-Pin SO (derate 5.9mW/°C above +70°C).................471mW
Operating Temperature Range ..........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10s) ..................................+300°C

The MAX5948A/MAX5948B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5948A/MAX5948B operate from -20V to -80V and are well-suited for -48V power systems. The MAX5948A is pin- and function-compatible with both the LT1640AL and LT1640L. The MAX5948B is pin- and function-compatible with both the LT1640AH and LT1640H.

The MAX5948A/MAX5948B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5948A/MAX5948B provide undervoltage, overvoltage, and overcurrent protection. These devices ensure the input voltage is stable and within tolerance before applying power to the load.

Both the MAX5948A and MAX5948B protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition.

Both devices feature an open-drain power-good status output, PWRGD for MAX5948A or PWRGD for MAX5948B, that can be used to enable downstream converters.

The MAX5948A/MAX5948B are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.