Dual, Interleaved, Fixed-Frequency Step-Down

Controller with a Dynamically Adjustable Output

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.

CSH_, CSL_, OUT_, PGOOD_,

G0, G1, ILIM_, REFIN to GND ..................................-0.3V to +6V

FB2, SKIP, ON_ to GND ...........................................-0.3V to +6V

BST1, BST2 to PGND .............................................-0.3V to +36V

LX1 to BST1..............................................................-6V to +0.3V

LX2 to BST2..............................................................-6V to +0.3V

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

REF Short Circuit to GND ...........................................Continuous

°C)

40-Pin 6mm x 6mm Thin QFN (derated 26.3mW/

°C

above +70

°C).............................................................2105mW

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

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

INPUT SUPPLIES (Note 1)

Input Voltage Range

4.5

5.5

V

OUT1 and FB2 forced above their

regulation points

1.0

1.8

mA

OUT1 and FB2 forced above their

regulation points

1.5

5

µA

2.5

5

µA

ON1 = ON2 = GND

<1

5

µA

PWM CONTROLLERS

50% duty cycle

-5

0

+5

Main Output-Voltage Accuracy

(OUT1 Tracking)

With respect to

REFIN, SKIP =

10% to 90% duty cycle

-10

+10

mV

FB2 = GND

2.475

2.5

2.525

Secondary Preset Output-Voltage

Accuracy (OUT2 Fixed)

1.780

1.8

1.820

V

50% duty cycle

0.490

0.50

0.510

Secondary Feedback-Voltage

Accuracy (FB2 Adjustable)

(Note 1)

10% to 90% duty cycle

0.485

0.515

V

Load-Regulation Error

0.1

%

1

%

OUT1 (tracks REFIN)

0.5

2.0

Output Adjust Range

OUT2

0.5

2.7

V

OUT1 Input Bias Current

-1

+1

µA

FB2 Input Bias Current

-0.1

+0.1

µA

FB2 = GND or adjustable

120

250

460

OUT2 Input Resistance

85

180

335

k

Ω