4

FN9168.2

September 22, 2006

ISL6549

Absolute Maximum Ratings

Thermal Information

VCC12 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +14V

PVCC5, VCC5 . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +7V

VCC5 (if used with external supply). . . . . . . . . . . GND - 0.3V to +6V

BOOT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to +27V

LGATE . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to PVCC5 + 0.3V

LDO_DR . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC12 + 0.3V

FB, LDO_FB, COMP, FS_DIS . . . . . . . GND - 0.3V to VCC5 + 0.3V

ESD Classification

Human Body Model (Per JESD22-A114C) . . . . . . . . . . . . . . Class 2

Machine Model (Per EIA/JESD22-A115-A) . . . . . . . . . . . . . .Class B

Charge Device Model (Per JESD22-C101C). . . . . . . . . . . . Class IV

Thermal Resistance

SOIC Package (Note 1) . . . . . . . . . . . .

105

N/A

QFN Package (Notes 2, 3). . . . . . . . . .

52

14

QSOP Package (Note 1) . . . . . . . . . . .

110

N/A

Maximum Junction Temperature (Plastic Package) . . . . . . +150°C

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

Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . +300°C

(SOIC - Lead Tips Only)

Recommended Operating Conditions

External Supply Voltage on VCC5 . . . . . . . . . . . . . . . . . . +5.0V ±5%

Supply Voltage on VCC12 . . . . . . . . . . . . . . . . . . . . . . . +12V ±10%

Ambient Temperature Range (C). . . . . . . . . . . . . . . . . . 0°C to 70°C

Ambient Temperature Range (I) . . . . . . . . . . . . . . . . -40°C to +85°

Junction Temperature Range. . . . . . . . . . . . . . . . . . . 0°C to +125°C

CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation of the

device at these or any other conditions above those indicated in the operational sections of this specification is not implied.

NOTES:

1.

θ

2.

Tech Brief TB379.

3. For

θ

Electrical Specifications

Recommended Operating Conditions, unless otherwise noted. VCC12 = 12V

Temperature = 0 to +70°C (typical = +25°C) for Commercial; Temperature = -40 to + 85°C (typical = +25°C) for

Industrial. Refer to Block Diagram, Simplified Power System Diagram, and Typical Application Schematic.

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

VCC SUPPLY CURRENT

Nominal Supply Current VCC12 (disabled)

UGATE, LGATE and LDO_DR open;

FS_DIS = GND

23

mA

Nominal Supply Current VCC5 (disabled)

UGATE, LGATE and LDO_DR open;

FS_DIS = GND (Note 4)

57.5

mA

Nominal Supply Current VCC12

(includes PVCC5 current)

UGATE, LGATE and LDO_DR open;

12

18

mA

Nominal Supply Current VCC5

UGATE, LGATE and LDO_DR open;

46

mA

Maximum PVCC5 Current Available (Note 5)

100

mA

VCC12 to PVCC5 Current Limit (Note 5)

150

mA

PVCC5 Voltage

ISL6549C; No external load

4.95

5.25

5.8

V

ISL6549I; No external load

4.85

5.25

5.8

POWER-ON RESET

Rising VCC5 Threshold

VCC12 = 12V

3.7

4.2

4.5

V

Falling VCC5 Threshold

VCC12 = 12V

3.3

3.8

4.1

V

Rising VCC12 Threshold

VCC5 = 5V

8.8

9.5

10.0

V

Falling VCC12 Threshold

VCC5 = 5V

7.0

7.5

8.0

V

OSCILLATOR AND SOFT-START

Switching Frequency

540

620

700

kHz

525

620

700

kHz