ELECTRICAL CHARACTERISTICS

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

(6)

MAX

UNITS

Input Supply Range

1.8

5.25

V

Output Voltage Range

2.5

5.5

V

Output Over Voltage Protection

6

V

Input Quiescent Current

No load, no switching

(exclude input current from CE)

50

70

A

Shutdown Current

0.1

1

A

1.78

V

0.1

V

Linear Charge Current Limit

(7)

1.2

A

1

Soft-start time

1

ms

CE High-Level Threshold

CE Rising

1.2

V

CE Low-Level Threshold

CE Falling

0.4

V

Switching Frequency

500

KHz

Feedback Reference Voltage

1.182

1.2

1.218

V

(8)

35

55

m

(8)

42

60

m

Maximum Duty Cycle

90

95

97

%

Main N-FET Current Limit

(7) (9)

5.0

A

Thermal Shutdown

(7)

150

°C

Thermal Shutdown Hysteresis

(7)

20

°C

(6) Typical numbers are at 25°C and represent the most likely norm.

(7) Specification is guaranteed by characterization and not 100% tested in production.

(8) Does not include the bond wires. Measured directly at the die.

(9) Duty cycle affects current limit due to ramp generator.

TYPICAL APPLICATION CIRCUIT

Figure 1 Standard Application Circuit

LESHAN RADIO COMPANY, LTD.

Ver0.1

5/7