5.0V to 75V

GND

OFF

OUT

IN

GATE

LM5050-1

OFF/ON

GND

GND

Q1

SUM40N10-30

1 PF

100V

D1

B180-13-F

VS

S

D

G

ON/OFF

Control

Q1

GND

Cout

D1

D2

D3

D4

C1

R1

GND

Q2

100

»

0.1µF

100V

LM5050-1

IN

GATE

OUT

VS

GND

SMBJ60A

22uF

63V

1uF

75V

SS16T3

BAS40-7-F

SS16T3

NTR5198NLT3G

SUM40N10-30

48V

LM5050-1, LM5050-1-Q1

www.ti.com

SNVS629E – MAY 2011 – REVISED DECEMBER 2015

8.2.4 Reverse Input Voltage Protection With IQ Reduction

If Vs is powered while IN is floating or grounded, then about 0.5 mA will leak from the Vs pin into the IC and

about 3 mA will leak from the OUT pin into the IC. From this leakage, about 50 uA will flow out of the IN pin and

the rest will flow to ground. This does not affect long term reliability of the IC, but may influence circuit design.

In battery powered applications, whenever LM5050-1 functionality is not needed, the supply to the LM5050-1 can

be disconnected by turning “OFF” Q2, as shown in Figure 29. This disconnects the ground path of the LM5050-1

and eliminates the current leakage from the battery.

The quiescent current of LM5050-1 can be also reduced by disconnecting the supply to VS pin, whenever

LM5050-1 function is not need.

Figure 29. Reverse Input Voltage Protection With IQ Reduction Schematic

8.2.5 Basic Application With Input Transient Protection

Figure 30. Basic Application With Input Transient Protection Schematic

Copyright © 2011–2015, Texas Instruments Incorporated

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Product Folder Links: LM5050-1 LM5050-1-Q1