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BD1601MUV
Datasheet
(2) Charge pump
a) Description of operations
Pin voltage comparison takes place at VOUT control section, and then VOUT generation takes place so that the LED
cathode voltage with the highest Vf is set to 0.2V. A boost rate is changed automatically to a proper one at the Charge
Pump Mode Control section so that operation can take place at possible low boost rate. When the current taken from
VBAT exceeds 600mA, the overcurrent limiter is activated and this IC is reset. In addition, if the output voltage falls
below 1.5V, this IC is reset for short-circuit at output.
b) Soft start function
BD1601MUV have a soft start function that prevents the rush current.
T OFF
EN/LED*
VOUT
I LED
Soft Start
Ordinal mode
Figure 15. Soft Start
c) Automatic boost rate change
The boost rate automatically switches to the best mode.
* (×1 mode -> ×1.5 mode) or (×1.5 mode -> ×2 mode)
If a battery voltage drop occursBD1601MUV cannot maintain the LED constant current, and then mode transition begins.
* (×1.5 mode -> ×1 mode) or (×2 mode -> ×1.5 mode)
If a battery voltage rise occurs, VOUT and VBAT detection are activated, and then mode transition begins.
(3) UVLO (Ultra low Voltage Lock Out)
If the input voltage falls below 2.2V, BD1601MUV is shut down to prevent malfunction due to ultra-low voltage.
(4) OVP (Over Voltage Protection)
This circuit protects this IC against damage when the C/P output voltage (VOUT) rises extremely for some external factors.
(5) Thermal shutdown (TSD)
To protect this IC against thermal damage or heat-driven uncontrolled operations, this circuit turns off the output if the
chip temperature rises over 175 ℃ . In addition, it turns on the output if the temperature returns to the normal temperature.
(6) Power sequence
VBAT
EN
*VBAT voltage ≧ EN voltage
Figure 16. Power sequence
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? 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 ? 15 ? 001
9/14
TSZ02201-0G3G0C200030-1-2
05.Nov.2012 Rev.001
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