SC900A 查看數據表（PDF） - Semtech Corporation

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SC900A

Programmable Penta ULDO with RESET and I2C Interface

Semtech Corporation 

SC900A

POWER MANAGEMENT

Electrical Characteristics (Cont.)

Parameter

Symbol

Conditions

Min Typ Max

LDO Regulators

Quiescent Supply Current

Quiescent Supply Current

at Start-Up

Current Limit

Bypass Capacitor

LDO Regulator A (Core Supply)

IQ

IQSUP

ILIM

CBYP

All LDOs active in

default states

190 360

LDO A, B, C active in default states

VOUT + 0.5V < VIN < 5.5V

125

250 410 650

Ceramic, low ESR

2.2

1.45V ≤ VOUT ≤ 3.00V

Output Voltage Accuracy

VOAA

VOUT + 0.2V ≤ VIN ≤ 5.5V

-3

+3

IOUT = 1mA, TA = 25°C

Output Voltage Accuracy at

2.80V (DAC = 11011)

IOUT = 1mA

-2

+2

Output Voltage Accuracy at

1.80V (DAC = 00011)

VOASA

IOUT = 1mA, TA = 25°C

-3

+3

Output Voltage Accuracy at

2.80V (DAC = 11011)

Maximum Output Current

IOMAXA

VOUT + 0.5V ≤ VIN ≤ 5.5V,

IOUT = 200mA

-3.5

200

+3.5

Default Setting: ON

VOA-HI

VOA-LO

VASEL - High

VASEL - Low

2.80

1.80

Line Regulation at 1.8V, 2.8V LINEREGA IOUT = 1mA, VOUT + 0.2V < VIN < 5.5V

2.5 12

Load Regulation at 1.8V, 2.8V LOADREGA

1mA < IOUT <200mA

-3 -20

Dropout Voltage

VDA

VOUT = 3.0V, IOUT = 200mA

200 250

f = 10Hz - 1kHz, CBYP = 0.1μF,

Power Supply Rejection Ratio PSRRA

IOUT = 50mA,

60

2.5V ≤ VOUT ≤ 3.0V

f = 10Hz - 100kHz, IOUT = 50mA,

Output Voltage Noise(2)

en-A

CVREF = 0.1μF, COUT = 2.2μF,

45

2.5V ≤ VOUT ≤ 3.0V

LDO Regulator B (DIGITAL I/O SUPPLY)

Output Voltage Accuracy

Output Voltage Accuracy at

2.80V (DAC = 11011)

VOAB

VOASB

1.45V ≤ VOUT ≤ 3.00V

VOUT + 0.15V ≤ VIN ≤ 5.5V

-3

IOUT = 1mA, TA = 25°C

IOUT = 1mA

-2

VOUT + 0.5V ≤ VIN ≤ 5.5V,

IOUT = 150mA

-3.5

+3

+2

+3.5

Maximum Output Current

IOMAXB

150

Units

μA

μA

mA

μF

%

%

%

%

mA

V

V

mV

mV

mV

dB

μVRMS

%

%

%

mA

© 2005 Semtech Corp.

3

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