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PDF BD6076GUT Data sheet ( Hoja de datos )
| Número de pieza | BD6076GUT | |
| Descripción | White Backlight LED Drivers | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
White LED Driver
with Synchronous Boost Converter
and PWM Brightness Control for up to 4 LEDs in Series
BD6076GUT
●General Description
The BD6076GUT is a white LED driver IC with
synchronous rectification that can drive up to 4LEDs.
With synchronous rectification (no external schottky
diode required) and small package, they can save
mount space.
And the brightness of LED can be adjusted by using
PWM pulse on EN pin.
●Key Specifications
■ Power supply voltage range:
■ Switching Frequency:
■ Quiescent Current:
■ Operating temperature range:
2.7V to 5.5V
1.25MHz(Typ.)
0.1µA(Typ.)
-30°C to +85°C
●Package
VCSP60N1
W(Typ.) x D(Typ.) x H(Max.)
1.68mm x 1.68mm x 0.68mm
●Features
■ Synchronous rectification Boost DC/DC converter
■ No external schottky diode required
■ Driving 4 series white LEDs
■ Internal Load Disconnect SW
■ Over voltage protection
■ Protect open and short output
■ Thermal shut down
■ Brightness adjustment by external PWM pulse
■ Small and Thin CSP package in 8pins
●Applications
White LED Backlight
Torch light and easy flash for camera of mobile phone
●Typical Application Circuit
●Pin Configuration
CIN L 10µH or
22µH
SW VIN
BD6076GUT
GND GNDA
EN
V OU T
COUT
VOUTPUT
white LED
VFB
RFB
C1 C2 C3
B1 B3
A1 A2 A3
<BOTTOM VIEW>
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/18
TSZ02201-0G3G0C200360-1-2
12.SEP.2012 Rev.001
1 page  
BD6076GUT
●Typical Performance Curves - continued
500
Ta=85℃
450
400
350 Ta=25℃
Ta=-30℃
300
3.1 3.5 3.9 4.3 4.7 5.1
VIN [V]
Figure 5. Inductor current limit
vs.
Power supply voltage
5.5
Datasheet
Figure 6. Efficiency vs. LED current
(4LED=VOUT13V)
Figure 7. Efficiency vs. LED current
(4LED=VOUT13V)
coil : TDK VLS3010T220M
Figure 8. Output power
vs.
Power supply voltage
coil : TDK VLS3010T220M
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/18
TSZ02201-0G3G0C200360-1-2
12.SEP.2012 Rev.001
5 Page 
BD6076GUT
Datasheet
●Start control and brightness control
BD6076GUT can control the start conditions by its EN terminal, and power off at 0.4V or below, and power on at 1.2V or
higher. And by changing the duty of power on and off by PWM control, the LED brightness can be adjusted.
1. PWM brightness adjustment is done by giving PWM signal to EN as shown in Figure 23.
The BD6076GUT is powered on/off by the PWM signal. By this method, LED current is controlled from 0 to the maximum
current. The average LED current increases with proportion to the duty cycle of PWM signal. While in PWM off-cycle mode,
the IC and LED both consume no currents, thus providing a high-efficiency operation. The recommended PWM frequency
is 100Hz to 300Hz.
10µH or 22µH
VIN
4.7µF
VIN SW VOUT
4.7µF
PWM
VOUTPUT
EN
GNDA GND VFB
33ohm
Figure 23. The brightness adjustment example of EN terminal by PWM (fPWM = 100 to 300Hz)
High Pulse
Minimum High Pulse = 13µs
EN (Duty = 1/256)
Range of Period = 3.3 ~ 10 ms
Period
Low Pulse
EN
Minimum Low Pulse = 13µs
(Duty = 255/256)
Range of Period = 3.3 ~ 10 ms
Period
Figure 24. The Rule of PWM signal of EN
●VFB characteristic on PWM function
BD6076GUT constantly controls the rising time to decrease the tolerance of the VFB voltage at PWM function.
VFB [mV]
EN
VFB
13μs typ
Max
Typ
Min
150mV(average)
+3% Typical
-3% Target Spec
Figure 25. VFB signal at PWM
3.1
VFB [mV]
500mV
3.6 5.5
Duty 30%
VIN [V]
150mV
(Average)
time
Figure 26. VFB Voltage Line Regulation (PWM Duty=30%)
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/18
TSZ02201-0G3G0C200360-1-2
12.SEP.2012 Rev.001
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet BD6076GUT.PDF ] | |
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