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PDF BD6155FVM Data sheet ( Hoja de datos )
| Número de pieza | BD6155FVM | |
| Descripción | DC/DC converter for LCD back light | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Communication ICs
BD6155FVM
DC/DC converter for LCD back light
BD6155FVM
BD6155FVM is an ideal IC to drive white LED used for the LCD back light of cellular phones, and PDA etc.
This IC incorporates charging pump step-up circuit to drive white LED with high VF. It also integrates a driver to drive
white LED with 4-step constant current. Only one external resistor can set the current value.
!Applications
Small portable appliances, such as cellular phones, PHS, PDA
Battery-powered equipments using the white LED.
!Features
1) Built-in charging pump step-up circuit.
2) Built-in constant current driver for LED. (Current value : 4 steps variable)
3) Ultra small MSOP8 package. (Height 0.9mm Max.)
!Absolute maximum ratings (Ta=25°C)
Parameter
Symbol
Maximum supply voltage
VBAT
Maximum input voltage
VIN
Power dissipation
Pd
Operating temperature
Topr
Storage temperature
Tstg
∗ Reduce to 3.5mW/°C when Ta=25°C or above.
Limits
−0.3~+6.0
−0.3~+6.0
350 ∗
−25~+75
−55~+125
Unit
V
V
mW
°C
°C
!Recommended operating conditions (Ta=25°C)
Parameter
Power supply
Symbol
VBAT
Min.
2.9
Typ.
−
Max.
5.5
Unit
V
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1 page  
Communication ICs
BD6155FVM
!Design information
1. The maximum of power loss of this IC is controlled by the output transistor M1 in regulator driver.
Relations of the power supply voltage are signified in 2 expressions with this loss.
∆V = VOUT − (VF2 + ILED × R1 + VLED)
The loss in M1,
∆V × ILED = ILED × {2VBAT− (2VF1 + VF2 + ILED × R1 + VLED)} (2 expressions)
∆V ; The voltage between LED-LEDS
VF1 ; Shotky’s Di VF
VF2 ; LED’s VF
VOUT ; Charge pump output voltage (Fig.2)
VLED ; The voltage across RSENSE (examples at 205mV calculation)
ILED ; Drive current.
ILED
VF1 VF1
VOUT
VBAT
VF2
LED
R1
LED
M1
0.2V
LEDS
RSENS
∆V
Room temperature power dissipation
(350mW)
Pd-VBAT
300
200
100
VF1=0.5V
VF2=3.4V
R1=0Ω
IO=50mA
IO=80mA
0
2
345
Power supply voltage VBAT (V)
6
2) Power supply voltage
The thermal shutdown circuit turn on, and output electric current declines when chip temperature is about 125 degrees
due to low electric current driver.
5/7
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet BD6155FVM.PDF ] | |
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