2A, 40V Step-Down DC-DC Converter with

Dynamic Output-Voltage Programming

2

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, ON/OFF to GND........…. ...................................-0.3V to +45V

BST to LX................................................................-0.3V to +12V

PGND, EP to GND .................................................-0.3V to +0.3V

REG, DVREG, SYNC to GND .................................-0.3V to +12V

FB, COMP, FSEL, REFIN, REFOUT,

Continuous Current through Internal Power MOSFET

20-Pin Thin QFN, single-layer board (5mm x 5mm)

(derate 21.3mW/°C above +70°C) ...........................1702.1mW

20-Pin Thin QFN, multilayer board (5mm x 5mm)

(derate 34.5mW/°C above +70°C) ...........................2758.6mW

Maximum Junction Temperature .....................................+150°C

Storage Temperature Range ............................-60°C to +150°C

Lead Temperature (soldering, 10s) ................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Voltage Range

7.5

40.0

V

UVLO Rising Threshold

6.80

7.20

7.45

V

UVLO Falling Threshold

6.0

6.5

7.0

V

UVLO Hysteresis

0.7

V

Quiescent Supply Current

1.6

2.8

mA

Switching Supply Current

14.5

mA

Shutdown Current

6

15

µA

ON/

OFF CONTROL

Input-Voltage Threshold

1.200

1.225

1.270

V

Input-Voltage Threshold

Hysteresis

120

mV

Input Bias Current

-250

+250

nA

Shutdown Threshold Voltage

0.2

V

INTERNAL VOLTAGE REGULATOR (REG)

Output Voltage

7.1

8.3

V

OSCILLATOR

450

550

Frequency

270

330

kHz

85

Maximum Duty Cycle

90

%

SYNC/FSEL High-Level Voltage

2

V

SYNC/FSEL Low-Level Voltage

0.8

V

SYNC Frequency Range

100

550

kHz