MAX17548 datasheet(4/28 Pages) MAXIM

4 / 28 page

(VIN = 24V, RT = open, CVCCINT = 4.7µF, EN_ = open, DH_, DL_ = open, TJ = -40°C to +125°C, unless otherwise noted. Typical values

are at TA = +25°C.) (Note 2)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

VCCINT REGULATOR

VCCINT Output Voltage

VCCINT

6V < VIN < 42V, IVCCINT = 1mA

4.95

5.1

5.25

6V < VCCEXT < 24V, IVCCINT = 1mA

(VCCINT supplied from VCCEXT)

4.95

5.1

5.25

VCCINT Load Regulation

VIN = 12V, I = 0mA to 100mA, VCCEXT =

0V (VCCINT supplied from VIN)

VVCCEXT = 12V, IVCCINT = 0mA to 100mA

(VCCINT supplied from VCCEXT)

VCCINT Short-Circuit Output

Current

VIN = 8.5V, VCCEXT = 0V, VCCINT = 4V

120

250

340

VCCEXT = 8.5V, VCCINT = 4V

(VCCINT supplied from VCCEXT)

120

250

340

VCCINT Dropout Voltage

VIN = 4.5V, load = 75mA, VCCEXT = 0

150

420

VCCINT supplied from VCCEXT, VIN = 24V,

VCCEXT = 4.7V, load = 75mA

150

420

VCCEXT Switch Overvoltage

VCCEXT rising

4.55

4.7

4.85

VCCEXT Switch Overvoltage

Hysteresis

0.2

0.25

0.3

VCCINT UVLO

VCCINT rising

4.2

4.4

VCCINT falling

3.5

3.7

3.9

OSCILLATOR

Switching Frequency

fSW

RT = 62kΩ

405

440

475

kHz

RT = VCCINT

480

535

590

RT = GND

325

350

375

RT Pullup Current

VRT = 0.5V

9.5

10.5

µA

Switching Frequency

Adjustable Range

fSW

26.5kΩ < RT < 280kΩ

100

2200

kHz

SKIP

DCM Mode Setting Range

1.25

VCCINT

-1.6

PWM Mode Setting Range

VCCINT

- 1.5

VCCINT

SKIP Pulldown Resistance

100

130

kΩ

MAX17548

42V, Dual-Output, Synchronous

Step-Down Controller

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Electrical Characteristics (continued)

MAX17548 Datasheet(PDF) 4 Page - Maxim Integrated Products

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