http://www.belling.com.cn

- 6-

8/16/2006

BL8558

Vdrop

1

Dropout

Voltage,Vout≥2.8V

Iout=100mA

88

120

mV

Iout=300mA

270

350

mV

Iout=500mA

460

600

mV

Vout

Vin

Vout

⋅

∆

∆

Line Regulation

Iout=40mA

2.8V≤Vin≤8V

0.05

0.2

%/V

Vout

∆

/

Iout

∆

Load Regulation

Vin=Set Vout+1V

1mA≤Iout≤500mA

20

40

mV

Iss

Supply Current

Vin=Set Vout+1V

75

90

uA

Istandby

Supply Current

(Srandby)

Vin=Set Vout+1V

Vce=GND

0.1

1.0

uA

Vout

T

Vout

⋅

∆

∆

Output Voltage

Temperature

Coefficiency

Iout=30mA

±100

ppm/

°C

PSRR

Ripple Rejection

F=100Hz,

Ripple=0.5Vp-p

Vin=Set Vout+1V

65

dB

Ilim

Short Current Limit

Vout=0V

200

mA

Rpd

CE Pull down

Resistance

2.0

5.0

10.0

M

Ω

Vceh

CE Input Voltage “H”

1.5

Vin

V

Vcel

CE Input Voltage “L”

0

0.25

V

en

Output Noise

BW=10Hz~100kHz

47

uVrms

1. Vdrop=Vin1-(Vout2*0.98) Vout2 is the output voltage when Vin=Vout1+1.0V and Iout=300mA or Iout=500mA. Vin1 is

the input voltage at which the output voltage becomes 98% of Vout1 after gradually decreasing the input voltage.

Typical Application Circuit：

：

：

：

Explanation：

：

：

：

BL8558 series is a group of positive voltage output, low noise, low power consumption, low

dropout voltage regulator. BL8558 can provide output value in the range of 1.2V~4.5V every 0.1V

step. It also can be customized on command.

BL8558 includes high accuracy voltage reference, error amplifier, current limit circuit and output

driver module. BL8558 has excellent load and line transient response and good temperature

characteristics, which can assure the stability of chip and power system. And it uses trimming

technique to guarantee output voltage accuracy within±2%.

Application hints：

：

：

：

NOTE1: Input capacitor (Cin=1uF) is

recommended in all application circuit.

NOTE2: Output capacitor (Cout=3.3uF/4.7uF) is

recommended in all application to

assure the stability of circuit.

BL8558