11/07/08 SP7656 PowerBlox



Copyright 2008 EXAR Corporation

2

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the

operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended

periods of time may affect reliability.

PVIN….............................................................. -0.3V to 30V

SVIN…………………………………………..…..

-0.3V to 30V

Lx…………………………

.……………………….…-2V to 30V

ISET……………………………

.……………………-2V to 30V

FB……………..............................

....................-0.3V to 5.5V

Storage Temperature..……

.……………..…-65 C to 150 C

Junction Temperature..................................-40C to 125C

Lead Temperature (Soldering, 10 sec)......…………..300 C

ELECTRICAL SPECIFICATIONS

PARAMETER

MIN

TYP

MAX

UNITS

♦

CONDITIONS

UVLO Turn-On Threshold

4.2

4.35

4.5

V

UVLO Turn-Off Threshold

4.0

4.15

4.3

V

UVLO Hysteresis

0.2

V

Operating Input Voltage

Range

4.5

29

V

Operating Input Voltage

Range

7

29

V

♦

Operating VCC Current

0.3

3

mA

VFB=1.2V

Reference Voltage Accuracy

0.5

%

Reference Voltage Accuracy

0.5

2

%

♦

Reference Voltage

0.6

V

Reference Voltage

0.588

0.6

0.612

V

♦

Switching Frequency

510

600

690

kHz

Minimum ON-Pulse Duration

40

100

ns

♦

Minimum Duty Cycle

0

%

Maximum Duty Cycle

100

%

*See Duty Cycle restriction- applications section

SVIN - VDR voltage difference

4.5

5.5

V

♦

Measure SVIN – VDR, SVIN>7V

Overcurrent Threshold

270

300

330

mV

Measure SVIN - ISET

ISET pin Input Current

25

30

35

µA

OFF interval during hiccup

100

ms

Soft start time

3

5

9

ms

VFB=0.58V, measure between VIN=4.5V

and first GATE pulse

SHDN Threshold

0.8

1.0

1.2

V

♦

Apply voltage to FB

SHDN Threshold Hysteresis

100

mV

P-Channel FET ON

Resistance

60

mΩ

P-Channel FET Source

leakage

3

5

µA