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ROHM Semiconductor |
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
℃
℃
℃
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© 2010 ROHM Co., Ltd. All rights reserved.
1/20
2010.11 - Rev.A
BD9757MWV
●Operating conditions
Parameter
Symbol
Ratings
Min. Typ. Max.
Unit
Power supply voltage
VBAT
1.5
-
5.5 V
VREF terminal connection capacity
CVREF 0.47
1.0
4.7 μF
VREGA terminal connection capacity CVREGA 0.47
1.0
4.7 μF
【CH8 modulated light】
H fixed time when the modulated
light control setting is determined
TON
265X
1/fosc1
-
- sec
L fixed time when OFF
TOFF
256X
1/fosc1
-
- sec
H fixed time at the time of
modulated light control setting
TH 500
- 10000 nsec
L fixed time at the time of
modulated light control setting
TL 500 - 10000 nsec
H fixed time at the time of EN starting up TEN
4X
1/fosc1
-
- sec
L fixed time
before modulated light control setting
TCLR
7X
1/fosc1
-
255X
1/fosc1
sec
Time of light control setting
at the time of starting up
TSET
-
-
2048X
1/fosc1
sec
【Driver】
CH1 PMOS drain current
Idpl1
-
- 1.2 A
CH1 NMOS drain current
Idnl1
-
- 2.3 A
CH2,5 PMOS drain current
Idpl2
-
- 0.8 A
CH2, 5 NMOS drain current
Idnl2
-
- 0.8 A
CH3, 4 PMOS drain current
Idpl22
-
- 0.6 A
CH3, 4 NMOS drain current
Idnl22
-
- 0.6 A
CH6 driver output peak current
Idpeak
-
- ±0.5 A
CH7, 8 high side switch input current
Idpl7,8
-
- 1.0 A
CH7, 8 NMOS drain current
【Output voltage setting range】
CH1
Idnl6
-
- 0.8 A
- 4.5 - 5.4 V
CH2
- 1.0 - 4.4 V
CH3
- 1.0 - 4.4 V
CH4
- 1.0 - 4.4 V
CH5
- 1.0 - 4.4 V
CH6
- -8.0 - -5.0 V
CH7
- 8.5 - 16 V
CH8
- 8.5 - 20 V
Technical Note
conditions
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2/20
2010.11 - Rev.A
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