MAX8545 datasheet(2/18 Pages) MAXIM

2 / 18 page

Low-Cost, Wide Input Range, Step-Down

Controllers with Foldback Current Limit

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ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN = VL = VCC = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.)

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.

(All voltages referenced to GND unless otherwise noted.)

VIN to GND ............................................................-0.3V to +30V

VCC to GND .............................-0.3V, lower of 6V or (VL + 0.3V)

FB to GND ................................................................-0.3V to +6V

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

VL, DL, COMP to GND ..............................-0.3V to (VCC + 0.3V)

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

DH to LX ....................................................-0.3V to (VBST + 0.3V)

VL Short to GND ......................................................................5s

LX to GND ................................................................-1V to +30V

Input Current (any pin) .....................................................±50mA

Continuous Power Dissipation (TA = +70°C)

10-Pin µMAX (derate 5.6mW/°C above +70°C) ..........444mW

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

VCC = VL, VIN separate from VCC

4.9

28.0

VIN Operating Range

VIN

VIN = VL = VCC

2.7

5.5

VIN Undervoltage Lockout

(UVLO) Trip Level

Rising and falling edge, hysteresis = 2%

2.35

2.50

2.66

VIN Operating Supply Current

VFB = 0.88V (no switching)

0.7

1.2

VL Output Voltage

5.5V < VIN < 28V, VCC = VL,

1mA < ILOAD < 25mA

4.7

5.3

Thermal Shutdown

Rising temperature, typical

hysteresis = 10

°C (Note 1)

+160

°C

OSCILLATOR

MAX8545, MAX8546

250

300

360

Frequency

fOSC

MAX8548

100

120

kHz

DH output, MAX8545, MAX8546

Minimum Duty Cycle

DCMIN

MAX8548

DH output, MAX8545, MAX8546

Maximum Duty Cycle

DCMAX

MAX8548

SOFT-START

MAX8545, MAX8546

6.6

Digital Ramp Period

MAX8548

10.2

MAX8545, MAX8546

VOUT / 64

Soft-Start Levels

MAX8548

VOUT / 32

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