Low-Cost, 3A, 4.5V to 28V Input, 350kHz, PWM

Step-Down DC-DC Regulator with Internal Switches

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.

Note 1: LX has internal clamp diodes to PGND and IN. Applications that forward bias these diodes should take care not to exceed

the IC’s package power dissipation.

Note 2: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-

IN to SGND.............................................................-0.3V to +30V

PGOOD to SGND .....................................................-0.3V to +6V

BST to LX .................................................................-0.3V to +6V

BST to SGND .........................................................-0.3V to +36V

SGND to PGND ....................................................-0.3V to +0.3V

LX Current (Note 1) ....................................................-5A to +8A

Converter Output Short-Circuit Duration ...................Continuous

16-Pin TQFN (derate 14.7mW/°C above +70°C)

Multilayer Board .........................................................1666mW

Package Thermal Resistance (Note 2)

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

Soldering Temperature (reflow) .......................................+260°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

STEP-DOWN CONVERTER

Input-Voltage Range

4.5

28

V

Input Supply Current

Switching

2.1

4

mA

LDO

212

Shutdown Input Supply Current

18

28

µA

ENABLE INPUT

EN Shutdown Threshold Voltage

1.4

V

EN Shutdown Voltage Hysteresis

100

mV

1.7

1.95

2.15

V

EN Lockout Threshold Voltage

100

mV

EN Input Current

2

5.3

9

µA

POWER-GOOD OUTPUT

PGOOD Threshold

540

560

584

mV

PGOOD Threshold Hysteresis

15

mV

PGOOD Output Low Voltage

35

100

mV

PGOOD Leakage Current

10

nA

ERROR AMPLIFIER

Error Amplifier

Transconductance

1.6

mS

Error Amplifier Voltage Gain

90

dB

FB Set-Point Accuracy

600

606

612

mV

-100

+100

FB Input Bias Current

-100

+100

nA