Rohm BD60A00NUX Technical Notes

LED Drivers for LCD Backlights
White Backlight LED Drivers
for Small to Medium LCD Panels
(Switching Regulator Type)
BD60A00NUX, BD60A60NUX
●Description
This IC is boost DC/DC converter that can drive white LED with constant current. More stabled white LED lighting can be
achieved by direct current connection without electric tolerance and High-speed response by current mode. Moreover,
separating IC power supply (2.7V~5.5V) and coil power supply (2.3V~20V) makes it possible to widen input range, which
will be helpful to be applied to various kinds of applications. Over voltage setting can be selected corresponding to the
number of LED lightings. BD60A00NUX is for max 11 lightings, BD60A60NUX is for max 6 lightings.
●Features
1) Boost DC/DC converter
2) Drive LED 11 lightings (VOUT=3.6V×11+0.7V=40.3V <Vf MAX=3.7V>) BD60A00NUX
3) Brightness control by outside PWM signal (PWM frequency =100Hz~30kHz, 25kHz 1% dimming application)
4) Brightness control by DC input
5) Soft start function (1ms typ.)
6) Over voltage protection 42V typ. ( BD60A00NUX), 28Vtyp.( BD60A60NUX)
7) SBD open protection and output short protection
8) Over current protection
9) LED terminal over voltage protection
10) UVLO
11) VSON008x2030 package (2.0mm × 3.0mm × 0.6mm MAX)
●Applications
Digital video cameras, digital single-lens reflexes, digital still cameras, digital photo frames, personal navigations (PND),
mobile phones, smart phones, MID, PDA, hand-held computers, MP3 players, GPS, digital media players, etc.
●Absolute maximum ratings
Parameter
Maximum applied voltage 1
Maximum applied voltage 2
Maximum applied voltage 2
Operating temperature range
Storage temperature range
Power dissipation 1
*1 4 layer (ROHM Standard board) has been mounted. When it's used by more than Ta=25℃, it's reduced by 20mW/˚C.
●Recommended operating range (Ta=-40℃ ~ +85℃)
Parameter
Operating power supply voltage
Operating coil voltage
*When the operating supply voltage is over 4.61V for BD60A00NUX, please refer the application P.17
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Symbol Ratings
VMAX1 7
VMAX2 45
VMAX3 31
Topr -40 ~ +85
Tstg -55 ~ +150
Pd1 2000
Symbol Ratings
VIN 2.7 ~ 5.5 *
Vcoil 2.3 ~ 20
1/22
BD60A00NUX
Unit Condition
V Vin, EN, PWM, ISET terminals
FB, SW, Vout terminals
V
BD60A00NUX
FB, SW, Vout terminals
V
BD60A60NUX
℃
℃
*1
mW
Unit Conditions
V Vin terminal
V Coil voltage
2011.12 - Rev.A
No.11040EAT42