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BD6088GUL
Technical Note
Mode transition
The transition of boosts multiple transits automatically by VBAT Voltage and the VOUT Pin Voltage.
STANDBY
condition 1
1
SOFT
X1.0
mode down=”H”
X1.5
mode down=”H”
X2.0
ALL off
MLEDEN=”1” or W*EN=”1”
and
Ta<T TSD
CP x1.0 mode
After detecting VOUT>1.5V(typ), 128us(typ) wait
CP x1.0 mode
mode up=”H”
CP x1.5 mode
mode up=”H”
CP x2.0 mode
The mode transition of the charge pump works as follows.
＜ x1.0 → x1.5 → x2.0 Mode transition ＞
The transition of the mode is done when VOUT was compared with VBAT and the next condition was satisfied.
x1.0 → x1.5 Mode transition
VBAT ≤ VOUT + (Ron10×Iout)
(LED Pin feedback ： VOUT = Vf+0.2(Typ))
x1.5 → x2.0 Mode transition
VBAT×1.5 ≤ VOUT +(Ron15×Iout)
(LED Pin feedback ： VOUT = Vf+0.2(Typ))
Ron10: x1 Charge pump on resistance 1.2 ? (Typ)
Ron15: x1.5 Charge pump on resistance 7.1 ? (Typ)
＜ x2.0 → x1.5 → x1.0 Mode transition ＞
The transition of the mode is done when the ratio of VOUT and VBAT is detected and it exceeds a fixed voltage ratio.
x1.5 → x1.0 Mode transition
VBAT / VOUT =1.16(Design value)
x2.0 → x1.5 Mode transition
VBAT / VOUT =1.12(Design value)
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31/51
2011.04 - Rev.A
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