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LM2593HV

SNVS082E – DECEMBER 2001 – REVISED MAY 2016

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Copyright © 2001–2016, Texas Instruments Incorporated

Pin Functions (continued)

PIN

DESCRIPTION

NO.

NAME

7

SD/SS

I

Shutdown/Soft-start: The regulator is in shutdown mode, drawing about 90

μA, when this pin is driven

to a low level (

≤ 0.6 V), and is in normal operation when this Pin is left floating (internal pull-up) or

driven to a high level (

≥ 2 V). The typical value of the threshold is 1.3 V and the pin is internally

clamped to a maximum of about 7 V. If it is driven higher than the clamp voltage, it must be ensured

by means of an external resistor that the current into the pin does not exceed 1 mA. The duty cycle is

minimum (0%) if this Pin is below 1.8 V, and increases as the voltage on the pin is increased. The

maximum duty cycle (100%) occurs when this pin is at 2.8 V or higher. So adding a capacitor to this

pin produces a soft-start feature. An internal current source charges the capacitor from zero to its

internally clamped value. The charging current is about 5

μA when the pin is below 1.3 V but is

reduced to only 1.6

(1)

Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2)

Voltage internally clamped. If clamp voltage is exceeded, limit current to a maximum of 1 mA.

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

(1)

MIN

MAX

UNIT

63

V

6

V

1.5

V

Flag pin voltage

–0.3

45

V

Feedback pin voltage

–0.3

25

V

Output voltage to ground, steady-state

–1

V

Power dissipation

Internally limited

Lead temperature

S package

Vapor phase (60 s)

215

°C

Infrared (10 s)

245

T package, soldering (10 s)

260

Maximum junction temperature

150

°C

–65

150

°C

(1)

JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2)

The human body model is a 100-pF capacitor discharged through a 1.5-k resistor into each pin.

6.2 ESD Ratings

VALUE

UNIT

Electrostatic discharge

±2000

V

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

MAX

UNIT

Supply voltage

4.5

60

V

Temperature

–40

125

°C