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PDF BD9757MWV Data sheet ( Hoja de datos )
| Número de pieza | BD9757MWV | |
| Descripción | Switching Regulator IC | |
| Fabricantes | ROHM Semiconductor | |
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Regulators ICs for Digital Cameras and Camcorders
Switching Regulator IC
with Built-in FET (5V)
BD9757MWV
No.10036EAT09
●Description
BD9757MWV is an 8-channel switching regulator with a built-in FET for digital still camera. It has a built-in function to
light-control the white LED for backlight according to the light control setting signal from microcomputer.
●Features
1) Starting from VBAT terminal of 1.5V
2) Power of internal circuit is supplied from voltage boost CH1
3) Mounted with a total of 8ch including voltage boost 2ch, voltage step-down 4ch, inversion 1ch, and white
LED-purpose voltage boost (compatible with DC light control) 1ch
4) Built-in 5-channel transistors for synchronous rectification
5) Built-in 2-channel FET transistors for voltage boost
6) Built-in all-channel phase compensation between input and output of error amplifier
7) Channel 1 and 3 are common, but other channels are independent, so the ON/OFF is possible
8) Operating frequencies of 1.2MHz (CH1 ~ 5), 600KHz(CH6 ~ 8)
9) Built-in output breaking circuit (timer latch type) at the time of overload
10) Built-in 2ch of high side switch with soft start function
11) UQFN044V6060 package (6mm×6mm ,0.4mm pitch) with heat dissipation
●Applications
Digital still camera
●Absolute maximum ratings (Ta=25℃)
Parameter
Symbol
Ratings
Power Supply Voltage
VBAT
-0.3 ~ 7
VHx1 ~ 5
-0.3 ~ 7
Power Input Voltage
HS78H
-0.3 ~ 7
VLx7,8
-0.3 ~ 22
IomaxLx1
±2.5
IomaxHx1
±1.5
Maximum output current
IomaxHx2,5
IomaxHx3,4
+1.0
+0.8
IomaxHS78
+1.2
Power Dissipation
IomaxLx7,8
Pd
±1.0
0.54(※1)
Operating temperature range
Topr -25 ~ +85
Storage temperature range
Tstg -55 ~ +150
Junction temperature
Tjmax
+150
※1 At the time of a single IC. If used in more than Ta=25℃, reduced by 4.32mW/℃.
Units
V
V
V
V
A
A
A
A
A
A
W
℃
℃
℃
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/20
2010.11 - Rev.A
1 page  
BD9757MWV
●Reference data (1)
Start-up circuit operating frequency temperature characteristic
600
500
400
300
200
100
0
-40 -20 0 20 40 60 80 100
Ta [℃]
Fig.1 Start-up circuit frequency-Temp
Current mode operating frequency temperature characteristic
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
-40
-20
0
20 40 60 80 100
Ta [℃]
Fig.2 Frequency CH1 ~ 5-Temp
Technical Note
Voltage mode operating frequency temperature characteristic
700
680
660
640
620
600
580
560
540
520
500
-40
-20
0
20 40 60 80 100
Ta [℃]
Fig.3 Frequency CH6 ~ 8-Temp
VREGA output voltage temperature characteristic
2.60
2.58
2.56
2.54
2.52
2.50
2.48
2.46
2.44
2.42
2.40
-40
-20
0
20 40 60 80 100
Ta [℃]
Fig.4 VREGA output voltage-Temp
VREF6 output voltage temperature characteristic
1.06
1.04
1.02
1.00
0.98
0.96
0.94
-40 -20
0
20 40 60 80 100
Ta [℃]
Fig.5 CH6 Base voltage-Temp
100
95
90
85
80
75
70
65
60
10
CH1 boost 5.0 efficiency data
Vin=1.5V
Vin=2.4V
Vin=3.6V
Vin=4.2V
100 1000
Load current[mA]
10000
Fig.6 CH1
5.0V voltage boost efficiency-Io
100
95
90
85
80
75
70
65
60
55
50
45
40
10
CH4 step-down 1.8V efficiency data
Vin=2.4V
Vin=3.6V
Vin=4.2V
Vin=5.5V
100
Load current [mA]
1000
Fig.9 CH4
1.8V step-down efficiency-Io
CH2 step-down 3.2V efficiency data
100
95
90
85
80
75
70
65
60
55
50
10
Vin=3.6V
Vin=4.2V
Vin=4.8V
Vin=5.5V
100
Load current[mA]
100
0
Fig.7 CH2
3.2V step-down efficiency-Io
100
95
90
85
80
75
70
65
60
55
50
10
CH5 step-down 3.5V efficiency data
Vin=4.2V
Vin=4.8V
Vin=5.5V
100
Load current [mA]
1000
Fig.10 CH5
3.5V step-down efficiency-Io
100
95
90
85
80
75
70
65
60
55
50
45
40
10
CH3 step-down 1.2V efficiency data
100
Load current [mA]
Vin=1.5V
Vin=2.4V
Vin=3.6V
Vin=4.2V
Vin=5.5V
1000
Fig.8 CH2
3.2V step-down efficiency-Io
100
90
80
70
60
50
40
1
CH6 Reversal -6V efficiency data
10
Load current [mA]
Vin=2.4V
Vin=3.6V
Vin=4.2V
Vin=5.5V
100
Fig.11 CH6
-6V inverting efficiency-Io
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/20
2010.11 - Rev.A
5 Page 
BD9757MWV
●Timing chart (2)
Interval of modulated light setting
Technical Note
UPIC8
LED current
About 5.4msec
Tss8
Soft start is started
according to setting
Tss8 Oscillating frequency=6400counts
about 5.4msec
LED current is adjusted according to the set number of counts
Interval of soft start
It is returned immediately if the set voltage is exceeded
Vo8
Fig.27 CH8 start-up sequence
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/20
2010.11 - Rev.A
11 Page | ||
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