LM5575-Q1

SNOSB23C – OCTOBER 2008 – REVISED DECEMBER 2014

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Pin Functions (continued)

PIN

I/O

DESCRIPTION

APPLICATION INFORMATION

NAME

NO.

SW

14

O

Switching node

The source terminal of the internal buck switch. The SW pin should be

connected to the external Schottky diode and to the buck inductor.

PRE

15

O

Pre-charge assist for the bootstrap

This open drain output can be connected to SW pin to aid charging the

capacitor

bootstrap capacitor during very light load conditions or in applications

where the output may be pre-charged before the LM5575-Q1 is

enabled. An internal pre-charge MOSFET is turned on for 250 ns each

cycle just prior to the on-time interval of the buck switch.

BST

16

I

Boost input for bootstrap capacitor

An external capacitor is required between the BST and the SW pins. A

0.022-µF ceramic capacitor is recommended. The capacitor is charged

from Vcc through an internal diode during the off-time of the buck

switch.

EP

NA

--

Exposed Pad

Exposed metal pad on the underside of the device. It is recommended

to connect this pad to the PWB ground plane, in order to aid in heat

dissipation.

7 Specifications

7.1 Absolute Maximum Ratings

See

MIN

MAX

UNIT

76

V

BST to GND

90

V

PRE to GND

76

V

SW to GND (Steady State)

−1.5

V

76

V

14

V

BST to SW

14

V

OUT to GND

Limited to

Vin

SYNC, SS, FB, RAMP to GND

7

V

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Recommended Operating Conditions are

conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the

Electrical Characteristics.

(2)

If Military/Aerospace specified devices are required, please contact the Texas Instruments Sales Office/ Distributors for availability and

specifications.

7.2 Handling Ratings

MIN

MAX

UNIT

Storage temperature range

−65

150

°C

Electrostatic discharge

2000

V

(1)

AEC Q100-002 indicates HBM stressing is done in accordance with the ANSI/ESDA/JEDEC JS-001 specification.

7.3 Recommended Operating Conditions

(1)

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

MIN

MAX

UNIT

6

75

V

Operation Junction Temperature

−40

150

°C

(1)

Absolute Maximum Ratings are limits beyond which damage to the device may occur. Recommended Operating Conditions are

conditions under which operation of the device is intended to be functional. For ensured specifications and test conditions, see the

Electrical Characteristics.

4

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