2

FN9256.0

March 7, 2006

Absolute Maximum Ratings (Reference to SGND)

Thermal Information

Supply Voltage (PVIN, VCC) . . . . . . . . . . . . . . . . . . . . -0.3V to 6.5V

EN, RSI, MODE, PHASE, POR . . . . . . . . . . . . . -0.3V to VCC+0.3V

FB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 2.7V

PGND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 0.3V

Recommended Operating Conditions

PVIN Supply Voltage Range . . . . . . . . . . . . . . . . . . . . . 2.7V to 5.5V

Load Current Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0A to 1.2A

Ambient Temperature Range . . . . . . . . . . . . . . . . . . . .-40°C to 85°C

Thermal Resistance (Notes 1, 2)

3x3 DFN Package . . . . . . . . . . . . . .

44

5.5

Junction Temperature Range. . . . . . . . . . . . . . . . . . . -40°C to 125°C

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

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

Tech Brief TB379.

2.

Electrical Specifications

Unless otherwise noted, all parameter limits are guaranteed over the recommended operating conditions and

RSI = 0V, MODE = VCC, L = 1.8

PARAMETER

SYMBOL

TEST CONDITIONS

MIN

TYP

MAX

UNITS

SUPPLY

VCC Undervoltage Lockout Threshold

Rising

-

2.5

2.7

V

Falling

2.2

2.4

-

V

Quiescent Supply Current

MODE = VCC, no load at the output

-

25

50

µA

MODE = SGND, no load at the output

-

5

8

mA

Shut Down Supply Current

VCC = PVIN = 5.5V, EN = low

-

0.1

2

µA

OUTPUT REGULATION

FB Regulation Voltage

0.784

0.8

0.816

V

0.78

0.8

0.82

V

FB Bias Current

FB = 0.75V

-

0.1

-

µA

Output Voltage Accuracy

-3

-

3

%

Line Regulation

-

0.2

-

%/V

Maximum Output Current

1.2

-

-

A

COMPENSATION

Error Amplifier Trans-conductance

Adjustable version, design info only

-

20

-

µA/V

PHASE

P-Channel MOSFET On Resistance

PVIN = 3.6V, Io = 200mA

-

0.12

0.22

Ω

PVIN = 2.7V, Io = 200mA

-

0.16

0.27

Ω

N-Channel MOSFET On Resistance

PVIN = 3.6V, Io = 200mA

-

0.11

0.22

Ω

PVIN = 2.7V, Io = 200mA

-

0.15

0.27

Ω

P-Channel MOSFET Peak Current Limit

1.5

2.1

2.6

A

PHASE Maximum Duty Cycle

-

100

-

%

PWM Switching Frequency

1.35

1.5

1.75

MHz

PHASE Minimum On Time

MODE = low (forced PWM mode)

-

-

140

ns

Soft Start-Up Time

-

1.1

-ms

ISL6273