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TB62733FTG Fiches technique(PDF) 5 Page - Toshiba Semiconductor

No de pièce TB62733FTG
Description  Charge Pump type DC/DC Converter for White LED Driver
Download  12 Pages
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Fabricant  TOSHIBA [Toshiba Semiconductor]
Site Internet  http://www.semicon.toshiba.co.jp/eng
Logo TOSHIBA - Toshiba Semiconductor

TB62733FTG Fiches technique(HTML) 5 Page - Toshiba Semiconductor

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TOSHIBA
TB62733FTG
This datasheet is tentative, the values and contents are subject to change without any notice.
27-Jul-04 (Rev1.7) TB62733FTG (Page. 5)
Explanation of Operations
Principle of Basic Operation】
The following is the explanation for basic operation of 1.5 time
up converting
1. Charging to C1 and C2
By connecting C1 and C2 through internal Switch as shown in the figure
C1 and C2 is charged. In this case, the C1 is charged up to around
the half of Vin.(Vc1=1/2Vin)
Actually, the voltage is slightly lower than 1/2 Vin due to on resistance
Of internal switch and equivalent resistance of C1.
Thus, C2 is also charged up to 1/2 Vin as well.
2. Out put from C1 and C2 yjat are charged
By connecting C1 and C2 through internal switch as shown in the figure
The charged energy of C1 and C2 output to Vout.
At this time, Vout is added by the voltage charged to C1 and C2, therefore
Vout voltage is approximately 3/2 Vin.
1.5 times Up converting operation
This device performs up converting to output voltage (Vout) that is converted 1.5 times from input voltage. (Vin)
The input voltage will be allowed from 2.8V to 4.2V.
The actual output (Vout) will be differ by the conditions of output current, external parts, application circuit and
so on, because the feed back voltage will be hold at the constant voltage.
The ripple voltage of the output will be approximately 100mV peak to peak.
Vin
Vout
C1
C2
Vin
Vout
C1
C2
3. By repeating the operation 1 and 2 described above, the voltage is
supplied to Vout around 1.5 times of Vin.


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