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PDF BL8530 Data sheet ( Hoja de datos )
| Número de pieza | BL8530 | |
| Descripción | PFM STEP-UP DC/DC CONVERTER | |
| Fabricantes | Belling | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de BL8530 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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BL8530
PFM STEP-UP DC/DC CONVERTER WITH HIGH EFFICIENCY AND LOW NOISE
OUTLINE
The BL8530 series are CMOS-based PFM
step-up DC-DC Converter. The converter can
start up by supply voltage as low as 0.8V, and
capable of delivering maximum 200mA output
current at 3.3V output with 1.8V input Voltage.
Quiescent current drawn from power source is
as low as 7uA. All of these features make
BL8530 series be suitable for the portable
devices, which are supplied by a single battery
to four-cell batteries.
To reduce the noise caused by the switch
regulator, BL8530 is well considerated in circuit
design and manufacture. So that the interferer
to other circuits by the device is reduced
greatly.
BL8530 integrates stable reference
circuits and trimming technology, so it can
afford high precision and low temperature-drift
coefficient of the output voltage.
BL8530 is available in SOT-89-3
SOT-23-3 and SOT-23-5 packages which is PB
free. And in 5-pin packages, such as
SOT-23-5, the device can be switch on or off
easily by CE pin, to minimize the standby
supply current.
FEATURES
• Deliver 200mA at 3.3V Output voltage
with 1.8V input Voltage
• Low start-up voltage (when the output
current is 1mA)--------------------------0.8V
• The converter output voltage can be
adjusted from 2.5V 6.0V(In 0.1V step).
• Output voltage accuracy -----------±2
• Low temperature-drift coefficient of the
output voltage------------------±100ppm/
• Only three external components are
necessary: An inductor, a Schottky diode
and an output filter capacitor
• High power conversion efficiency---85
• Low quiescent current drawn from power
source------------------------------------- <7uA
APPLICATIONS
• Power source for PDA DSC MP3
Player electronic toy and wireless mouse
• Power source for a single or dual-cell
battery-powered equipments
• Power source for LED
SELECTION GUIDE
BL8530--XX X XX
PIN CONFIGURARION
www.belling.com.cn
Package Type
RN SOT-23-5
RM SOT-23-3
SM SOT-89-3
Function Description
1 Internal Tr. Driver
Without Enable circuit
2 Internal Tr. Driver
With Enable circuit
3 External Tr. Driver
Without Enable circuit
4 External Tr. Driver With
Enable circuit
Output Voltage
25 2.5V
30 3.0V
60 6.0V (In 0.1V step)
Ver1.0
1/14
Free Datasheet http://www.datasheet-pdf.com/
1 page  
BL8530
Before discussion we define D ≡ Vout − Vin .
Vout
1 Inductor Selection
Above all, we should define the minimum value of the inductor that can ensure the boost
DC-DC to operate in the continuous current-mode condition.
L min ≥ D(1 − D)2 RL
2f
The above expression is got under conditions of continuous current mode, neglect Schottky
diode’s voltage, ESR of both inductor and capacitor. The actual value is greater that it. If inductor’s
value is less than Lmin the efficiency of DC-DC converter will drop greatly, and the DC-DC circuit will
not be stable.
Secondly, consider the ripple of the output voltage,
∆I = D •Vin
Lf
Im ax = Vin + DVin
(1 − D)2 RL 2Lf
If inductor value is too small, the current ripple through it will be great. Then the current through
diode and power switch will be great. Because the power switch on chip is not ideal switch, the
energy of switch will improve. The efficiency will fall.
Thirdly in general, smaller inductor values supply more output current while larger values start
up with lower input voltage and acquire high efficiency.
An inductor value of 3uH to 1mH works well in most applications. If DC-DC converter delivers
large output current (for example: output current is great than 50mA), large inductor value is
recommended in order to improve efficiency. If DC-DC must output very large current at low input
supply voltage, small inductor value is recommended.
The ESR of inductor will effect efficiency greatly. Suppose ESR value of inductor is rL Rload is
load resistor then the energy can be calculated by following expression
∆η ≈
rL
Rload (1 − D) 2
For example: input 1.5V, output is 3.0V, Rload=20Ω, rL=0.5Ω, The energy loss is 10%.
Consider all above inductor value of 47uH ESR<0.5Ω is recommended in most applications.
Large value is recommended in high efficiency applications and smaller value is recommended
2 Capacitor Selection
Ignore ESR of capacitor the ripple of output voltage is:
r = ∆Vout = D
Vout Rload Cf
So large value capacitor is needed to reduce ripple. But too large capacitor value will slow
down system reaction and cost will improve. So 100uF capacitor is recommended. Larger
capacitor value will be used in large output current system. If output current is small (<10mA),
small value is needed.
Consider ESR of capacitor ripple will increase
r' = r + Im ax • RESR
Vout
When current is large, ripple caused by ESR will be main factor. It may be greater than 100mV
The ESR will affects efficiency and increase energy loss. So low-ESR capacitor (for example:
tantalum capacitor) is recommend or connect two or more filter capacitors in parallel.
www.belling.com.cn
Ver1.0
5/14
Free Datasheet http://www.datasheet-pdf.com/
5 Page 
Taping Reel Dimension
BL8530
Package
SOT-23-3
Package dimension
Devices per
reel
3000
Unit
mm
www.belling.com.cn
Ver1.0
11/14
Free Datasheet http://www.datasheet-pdf.com/
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet BL8530.PDF ] | |
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