REV2.0

Page3

BL8521

5.5V, 1.4MHz, 3A Synchronous Buck Converter

ABSOLUTE MAXIMUM RATING

LX Pin Switch Voltage --------------------------------------------------------------------------

0.3V to (PVDD + 0.3V)

Other I/O Pin Voltages ----------------------------------------------------------------------------

LX Pin Switch Current ---------------------------------------------------------------------------------------------------- 3.5A

C ,DFN-10L 3x3 ----------------------------------------------------------- 900mW

Package Thermal Resistance,DFN-10L3x3,

C/W

Junction Temperature --------------------------------------------------------------------------------------------------- 150

Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------------- 260

C

Storage Temperature Range -----------------------------------------------------------------------------

RECOMMENDED OPERATING CONDITIONS

Supply Input Voltage ----------------------------------------------------------------------------------------- 3.6 to 5.5V

Output Voltage Range ----------------------------------------------------------------------------------------0.8V to Vin

Junction Temperature Range -------------------------------------------------------------------------

Ambient Temperature Range ---------------------------------------------------------------------------

40C to 85C

ELECTRICAL CHARACTERISTICS

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

VDD_Max

Maximum Input Voltage

5.5

V

Supply Current

Vfb=0.9

500

1000

A

In Shutdown

1

A

LSON

Low side NMOS Rdson

100

200

m



HSON

High side PMOS Rdson

100

220

m



Vref

Feedback Voltage

0.784

0.8

0.816

V

Ifb

Feedback Leakage current

-5

0.1

5

A

REGlin

Line Regulation

Vin=4V to 5.5V

0

0.1

0.3

%/V

REGload

Load Regulation

Iout=1 to 3A

0

0.03

0.1

%/A

Fsoc

Switching Frequency

1.44

1.8

2.16

MHz

0.86

1.15

1.44

MHz

Ilimit

Peak Current Limit

3.2

4

A

SHDN_V

Shutdown Voltage

Vin-0.7V

Vin

V

UVLO_rise

Power on minimum Vin

voltage

Increase Vin until IC work

3.42

3.6

3.78

V

UVLO_fall

Power off Vin under voltage

lock out

Decrease Vin until IC shut

off

1.98

2.37

V