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SC1406G

Power Supply Controller for Portable Pentium II & III SpeedStep Processors

Semtech Corporation 

SC1406G

POWER MANAGEMENT

Electrical Characteristics Continued

Unless specified: -0 < TA < 100°C; VCC = 3.3V (See test circuit)

PARAMETER

Input Bias Current

Output Voltage, VFB15

CO_1.5 = 56µF, 20mW ESR max

or 150µF, 45mW ESR max

Capacitance tolerance = 20%

Base Drive Output Current

SYMBOL

CONDITIONS

1.5V Linear Regulator Controller

VFB15 = 1.5V

External pnp BJT with BMIN > 50 @

IC = 500mA

IO = 0mA to 500mA

TA = 25°C

MIN

T YP

MAX

UNITS

1

mA

1.47

1.50

1.54

V

10

120

mA

2.5V Linear Regulator Controller

Input Bias Current

Output Voltage, VFB15

CO_1.5 = 56µF, 20mW ESR max

or 150µF, 45mW ESR max

Capacitance tolerance = 20%

Base Drive Output Current

VFB15 = 2.5V

External pnp BJT with BMIN > 50 @

IC = 100mA

IO = 0mA to 100mA

TA = 25°C

Linear Regulator Soft Start (LRSS)

1

mA

2.45

2.50

2.55

V

2.5

20

mA

Linear Reg Soft Start Current

Enable Threshold

Soft-Start Termination Threshold

ILRSS

Charge Current = VLRSS = 0V

Discharge Current, VLRSS = 1.50V,

EN is low or the battery is in UVLO

-0.6

-1

-1.45

µA

0.3

1

mA

150

400

mA

1.53

1.70

1.87

V

Voltage Clamp (VCIN, VCOUT, VCBYP) (Note: This circuit section is rarely used).

Input Voltage

0.93

1.5

1.60

V

Output Voltage

Progagation Delay**

* Guaranteed by design.

**Guaranteed by characterization.

RVCOUT = 150W

tied to VS = 2.5V

IVCIN = -10µA

VCIN is Open

VVCIN = 0.175V

RVCOUT = 150W tied to VS = 2.5V

CVCBYP = 1500pF, VCIN steps from

0.175V to 1.50V and back.

Measured from 50% of VCIN step to

50% of VCOUT transient

0.8Vs

Vs

V

0.375

10

nS

ã 2000 Semtech Corp.

5

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