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BD6085GUL
Charge Pump Mode transition
The transition of boost multiple transits automatically by Vf of LED and the battery voltage.
Datasheet
STANDBY
1
SOFT
ALL off
Any LED on
Ta<T TSD
VBAT>2.3V(typ)
CP x1.0 mode
After “VOUT>1.5V(typ)” detected, 142us(typ) wait
mode down=”H”
mode down=”H”
mode down=”H”
X1.0
X1.33
X1.5
X2.0
CP x1.0 mode
mode up=”H”
CP x1.33 mode
mode up=”H”
CP x1.5mode
mode up=”H”
CP x2.0mode
All LED OFF
RESET
BD6085GUL changes the four charge pump movement mode automatically to realize low consumption power.
< Mode Up >
A LED terminal voltage is monitored, and the movement mode is changed to ×1 → ×1.33, ×1.33 → ×1.5 and ×1.5 → ×2
automatically when a LED terminal voltage is lower than 0.2V (typ).
At this time, the maximum output voltage of the charge pump is restricted to 5.1V (typ).
< Mode Down >
The rise in the battery voltage, the off control of LED lighting and the data writing to the address 02h,03h,04h (LED
Current Setting) is monitored, and the movement mode is changed to ×2 → ×1.5 → ×1.33 → ×1 automatically at
FLASHEN (Address 04h) =“0”. This mode down movement lasts until a mode up movement happens. At
FLASHEN=“1”, the mode down doesn't happen.
The thresholds of rise in a battery voltage are 2.9V, 3.3V, 3.7V and 4.1V (typ).
And, as for the off control of LED lighting, it is shown that MLEDEN, SLEDEN and FLLEDEN (Address 01h) and
FLASHEN (Address 04h) transited in “1” → “0”.
Over Voltage protection / Over Current protection
Charge Pump circuit output (VOUT) is equipped with the over-voltage protection and the over current protection
function. A VOUT over-voltage detection voltage is about 5.5V(typ). (VOUT at the time of rise in a voltage)
A detection voltage has a hysteresis, and a detection release voltage is about 5.1V(typ).
And, when VOUT output short to ground, input current of the battery terminal is limited by an over current protection
function.
www.rohm.com
? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
19/26
TSZ02201-0G3G0C200120-1-2
05.Oct.2012 Rev.001
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