MAX256ASA datasheet(2/14 Pages) MAXIM

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3W Primary-Side Transformer H-Bridge Driver

for Isolated Supplies

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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.)

Supply Voltage VCC..................................................-0.3V to +6V

ST1, ST2, CK_RS, MODE (Note 1)................-0.3V to VCC + 0.3V

ST1, ST2 Maximum Continuous Current (TA < +125°C) ....±0.6A

ST1, ST2 Maximum Continuous Current (TA < +100°C) ....±0.9A

ST1, ST2 Maximum Continuous Current (TA < +85°C) ......±1.0A

Continuous Power Dissipation (TA = +70°C)

8-Pin SO (derate 18.9mW/°C above +70°C)..............1509mW

Operating Temperature Range .........................-40°C to +125°C

Storage Temperature Range .............................-65°C to +150°C

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

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

DC ELECTRICAL CHARACTERISTICS

(VCC = +3.0V to +5.5V, TA = TMIN to TMAX. Typical values are at VCC = +5.0V and TA = +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Supply Voltage

VCC

3.0

5.5

Supply Current

ICC

MODE = VCC, CK_RS unconnected (Note 2)

1.06

3mA

Disable Supply Current

ISD

MODE = GND,

CK_RS unconnected

µA

External Resistance Range

kΩ

VCC = 4.5V (Note 3)

0.5

1.0

Driver Total Resistance

ROHL

VCC = 3.0V (Note 3)

0.6

1.2

Ω

Undervoltage Lockout Threshold

VUVLO

VCC rising

0.8

1.9

2.7

Undervoltage-Lockout-Threshold

Hysteresis

VUVLO_HST

110

VCC = 4.5V

0.8

Logic-Low Level

(MODE, CK_RS)

VIL

VCC = 3.0V

0.7

Logic-High Level

(MODE, CK_RS)

VIH

2.0

Input Leakage Current

(MODE)

ILK

1µA

Internal Pulldown Resistance on

CK_RS

RS_INT

MODE = GND

165

kΩ

Thermal Shutdown

TSHDN

165

°C

Thermal Shutdown Hysteresis

TSHDN_HST

°C

Note 1: ST1 and ST2 are not protected against short circuits. Damage to the device may result from a short-circuit fault.

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