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PDF BL8530C Data sheet ( Hoja de datos )

Número de pieza BL8530C
Descripción MULTI-FUNTION STEP-UP DC/DC CONTROLLER
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No Preview Available ! BL8530C Hoja de datos, Descripción, Manual

BL8530C
HIGH EFFICIENCY, LOW SUPPLY CURRENT, MULTI-FUNTION STEP-UP DC/DC CONTROLLER
OUTLINE
The BL8530C series are CMOS-based
PFM step-up DC-DC Controller with low supply
current and high output voltage accuracy.
Quiescent current drawn from power source is
as low as 6uA. It is capable of delivering
500mA output current at 4.0V output with 2V
input Voltage. Only four external components
are necessary: An inductor, a Schottky diode,
an output filter capacitor and a NMOSFET or a
NPN transistor All of these features make
BL8530C series be suitable for the portable
devices, which are supplied by a single battery
to four-cell batteries.
BL8530C has a drive pin (EXT) for
external transistor. So it is possible to load a
large output current with a power transistor
which has a low saturation voltage.
BL8530C integrates stable reference
circuits and trimming technology, so it can
afford high precision and low temperature-drift
coefficient of the output voltage.
BL8530C is available in SOT-23-3 and
SOT-23-5 packages which are PB free. And in
SOT-23-5 the device can be switch on or off
easily by CE pin, to minimize the standby
supply current.
FEATURES
Deliver 500mA at 4.0V Output voltage
with 2V input Voltage
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 four external components are
necessary: An inductor, a Schottky diode,
an output filter capacitor and a NMOSFET
or a NPN transistor
High power conversion efficiency---90
Low quiescent current drawn from power
source----------------------------------------- 6uA
Small package----- SOT-23-3 SOT-23-5
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
BL8530C--XX X XX
Package Type
RN SOT-23-5
RM SOT-23-3
Function Description
1 Without Enable circuit
2 With Enable circuit
Output Voltage
25 2.5V
30 3.0V
60
step)
6.0V (In 0.1V
PIN CONFIGURARION
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BL8530C pdf
BL8530C
BL8530C has a drive pin (EXT) for external transistor. So it is possible to load a large output
current with a power transistor and a low saturation voltage. At very light load condition, the switch
current and quiescent current of chip will effect efficiency certainly. So in very light load condition, the
efficiency will drop. Therefore, it is recommended that user use BL8530C in the condition of load
current as large as several tens of mA to several hundreds of mA.
SELECTION OF THE EXTERNAL COMPONENTS
Thus it can be seen, the inductor, schottky diode and external NMOSFET or NPN transistor.
affect the conversion efficiency greatly. The inductor and the capacitor also have great influence on
the output voltage ripple of the converter. So it is necessary to choose a suitable inductor, a
capacitor, an external NMOSFET or NPN transistor and a right schottky diode, to obtain high
efficiency and low ripple.
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=20, rL=0.5, The energy loss is 10%.
Consider all above inductor value of 47uH ESR<0.5is recommended in most applications.
Large value is recommended in high efficiency applications and smaller value is recommended
2 Output Capacitor Selection
Ignore ESR of capacitor the ripple of output voltage is:
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BL8530C arduino
Package information
SOT-23-3:
Package
SOT-23-3
Package dimension
Devices per
reel
3000
BL8530C
Unit mm
Taping Specification
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