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BD1604MUV, BD1604MVV
● Description of Block Operations
1) LED light control and current control
When LED lights are controlled, H- or L-level voltage is applied to respective control pins.
Current control in the BD1604MUV/MVV can take place via a resistance connected to the ISET pin.
ON/OFF control
Technical Note
SEL2 SEL1
0 0
0 0
0 1
0 1
1 0
1 0
1 1
1 1
SEL0
0
1
0
1
0
1
0
1
LED1
OFF
OFF
OFF
ON
OFF
OFF
ON
OFF
LED2
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
LED3
OFF
ON
OFF
OFF
ON
ON
ON
OFF
LED4
ON
OFF
OFF
OFF
ON
ON
ON
OFF
Rset: See the following table.
0: 0V, 1: VBAT
When handling pins, the LED pins must be connected to VBAT so long as LED is always OFF.
Current control
Rset 165k ?
97.6k ?
48.7k ?
32.4k ?
24.3k ?
16.2k ?
ILED 3mA 5mA 10mA
15mA
20mA
30mA
The LED current can be changed by the Rset value.
ILED=480/Rset
The above expression can be used for approximation.
2) Low supply voltage detection circuit (UVLO)
When the IC-applied supply voltage drops, all the circuits including the DC/DC converter are stopped. When supply voltage
drops to a detecting voltage, UVLO is activated. When it rises, UVLO is automatically released.
3) Soft start by DC/DC converter startup
When a DC/DC converter is started, soft start is enabled so that output voltage can be increased gradually to prevent output
voltage overshooting.
● Application Parts Selection Method
Capacitor (Use the ceramics parts with good frequency and temperature characteristics.)
Symbol
Recommended value Recommended part
Type
Cout,Cin,C1,C2
1 μ F
GRM188B11A105KA61B(MURATA)
Ceramics capacitor
Resistance
Symbol
Recommended value
Recommended part
Set Current Value
Rset
16k ?
240k ?
MCR006YZPF Series (ROHM)
30mA
2mA
Connect an input bypass capacitor (CIN) between VBAT and GND pin in proximity. In addition, connect an output capacitor
between VOUT and GND pins in proximity. Connect a capacitor between C1P and C1N and also a capacitor between C2P
and C2N in proximity to the chips. Connect a resistance in proximity to the ISET pin.
When other than these parts are used, the equivalent parts must be used.
www.rohm.com
? 2011 ROHM Co., Ltd. All rights reserved.
6/10
2011.06 - Rev.B
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