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© 2005 Semtech Corp.

www.semtech.com

SC2440

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Unless specified: -40°C < T

Parameter

Conditions

Min

Typ

Max

Units

COMP Switching Threshold

0.7

1.1

1.3

V

COMP Maximum Voltage

V

2.2

V

Channel Switching Frequecy

1.2

1.4

1.6

MHz

Maximum Duty Cycle

(Note 2)

80

90

%

Switch Current Limit

V

2

2.6

A

Switch Saturation Voltage

I

0.3

0.48

V

Switch Leakage Current

10

µA

Minimum Boost Voltage

I

1.8

2.5

V

Boost Pin Current

I

20

30

mA

I

60

80

mA

Minimum Soft-Start Voltage to Exit

Shutdown

SS1 Tied to SS2

0.2

0.4

0.7

V

Soft-start Charging Current

V

2

µA

V

1.8

µA

Soft-start Discharging Current

V

0.8

µA

Minimum Soft-start Voltage to

Enable Overload Shutoff

V

2

V

FB Overload Threshold

V

0.74

V

Soft-start Voltage to Restart

Switching After Overload Shutoff

V

0.7

1

1.3

V

Power Good Threshold Below FB

V

80

100

120

mV

Power Good Output Low Voltage

V

0.2

0.4

V

Power Good Pin Leakage Current

V

0.1

1

µA

SYNC Input High Voltage

2

V

SYNC Input Low Voltage

(Note 1)

0.8

V

SYNC Frequency

SYNC Frequency = 2 X Channel

Frequency. (Note 1)

3.4

5

MHz

SYNC Pin Input Current

V

60

75

µA

Thermal Shutdown Temperature

155

°C

Thermal Shutdown Hysteresis

10

°C

Notes: (1) Guaranteed by design, not tested in production.

(2) The maximum duty cycle specified corresponds to 1.4MHz switching frequency. Duty cycles higher than those specified can be

achieved by lowering the operating frequency.

(3) This device is ESD sensitive. Use of standard ESD handling precautions is required.