5

© 2005 Semtech Corp.

www.semtech.com

POWER MANAGEMENT

SC900A

Electrical Characteristics (Cont.)

Parameter

Symbol

Conditions

Min

Typ

Max

Units

LDO Regulator D (Cont.)

Maximum Output Current

IOMAX

D

150

mA

Default Setting: OFF

VO

D

3.10

V

Line Regulation at 3.10V

LINEREG

D

I

2.5

12

mV

Load Regulation at 3.10V

LOADREG

D

1mA < I

-3

-20

mV

Dropout Voltage

V

DD

V

150

190

mV

Power Supply Rejection Ratio

PSRR

D

f = 10Hz - 1kHz, C

I

2.5V ≤ V

60

dB

e

n-D

f = 10Hz - 100kHz, I

C

2.5V ≤ V

55

μV

RMS

LDO Regulator E

Output Voltage Accuracy

VOA

E

1.75V ≤ V

V

I

-3

+3

%

Output Voltage Accuracy at

3.10V (DAC = 10111)

VOAS

E

I

-2

+2

%

V

I

-3.5

+3.5

%

Maximum Output Current

IOMAX

E

150

mA

Default Setting: OFF

VO

E

3.10

V

Line Regulation at 3.10V

LINEREG

E

I

2.5

12

mV

Load Regulation at 3.10V

LOADREG

E

1mA < I

-3

-20

mV

Dropout Voltage

V

DE

V

150

190

mV

Power Supply Rejection Ratio

PSRR

E

f = 10Hz - 1kHz, C

I

2.5V ≤ V

60

dB

e

n-E

f = 10Hz - 100kHz, I

C

2.5V ≤ V

55

μV

RMS

A RESET

Reset Threshold

RESET

THLD

77

%

Reset Active Timeout Delay

t

RD

Delay in default state

75

100

125

ms

LDO POWER GOOD

PGOOD Threshold

PGOOD

THLD

77

%

PGOOD Active Timeout Delay

t

PG

Delay in default state

75

100

125

ms

Notes:

1) Digital outputs are powered from LDOB, so LDOB must be active for operation of LDOPGD and ARST.

2) Below 2.5V: becomes digital regulator.