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Regulators ICs for Digital Cameras and Camcorders
System Switching Regulator IC
with Built-in FET (5V)
BD9355MWV
●Description
7 Channel Switching Regulator Controller for Digital Camera that contains an internal FET.
Built in the function that dim a white LED for back light with a diming set signal from a microcomputer.
●Features
1) 1.5V minimum input operating
2) Supplies power for the internal circuit by step-up converter(CH1).
3) CH1step-up converter, CH2 cross converter, CH3,4 step-down converter,
CH5 inverting converter for CCD, CH6 boost converter for CCD, CH7 boost converter for LED
4) All channels contain internal Power MOSFET and compensation.
Built-In Over Voltage Protection (OVP) for CH1,2,7
5) Operating frequency 2.0MHz(CH3,4), 1MHz(CH1,2,5～7)
6) Contains sequence control circuit for CH1～4. It is possible to select sequence CH1⇒CH3⇒CH4⇒CH2 and
CH1⇒CH4⇒CH3⇒CH2 by SEQ_CTL pin
7) Built-In discharge switch (CH2,3,4) and contains off sequence control circuit for CH1～4.
CH1,3 turn off after CH2,4 output voltage discharged.
8) Built-In Short-circuit Protection (SCP)
9) CH1 have backgate control circuit CH6 have high side switches with soft start function.
10) Thermally enhanced UQFN036V5050 package(5mm□0.4mm pitch)
●Applications
For Digital Camera
●Absolute maximum ratings (Ta=25℃)
Parameter
Maximum applied power
Supply voltage
Maximum applied
input voltage
Maximum Output current
Power Dissipation
Operating Temperature
Storage Temperature
Maximum applied power
Supply voltage
*1 Should be derated by 7.04mW/℃ at Ta=25℃ or more. When mounted on a glass epoxy PCB of 74.2mm×74.2 mm×1.6 mm
www.rohm.com
© 2011 ROHM Co., Ltd. All rights reserved.
Symbol
HX2BAT,VCCOUT
VHx1～4, 56
( Hx56 - Lx5) Voltage
VLx6
VLx7
IomaxHx1, Lx1
IomaxHx2
IomaxHx3
IomaxHx4
IomaxHx56
IomaxHS6L
IomaxLx7,8
Pd
Topr
Tstg
HX2BAT,VCCOUT
1/22
BD9355MWV
No.11036EAT15
Ratings
-0.3～7
-0.3～7
-0.3～15
-0.3～22
-0.3～30
±2.2
±1.5
±1.2
±1.0
±1.5
+1.2
±1.0
0.88 (*1)
-25～+85
-55～+150
+150
2011.03 - Rev.A
Unit
V
V
V
V
V
A
A
A
A
A
A
A
W
℃
℃
℃
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Table of Contents
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Summary of Contents for Rohm BD9355MWV
- Page 1 Maximum applied power HX2BAT,VCCOUT +150 ℃ Supply voltage *1 Should be derated by 7.04mW/℃ at Ta=25℃ or more. When mounted on a glass epoxy PCB of 74.2mm×74.2 mm×1.6 mm www.rohm.com 2011.03 - Rev.A 1/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 2 Ripple voltage level of CH2 cross converter would be big by cross talk with embedded oscillator when oscillating Duty of step down side is 50 %. Therefore please not to set oscillating duty of CH2 with 50%. www.rohm.com 2011.03 - Rev.A 2/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 3 C=10µF 3 light 11.4 (TOKO:DE2815) down 1000 R1=300ｋΩ, C=4.7µF LED) R2=600kΩ 1000 L=4.7µH Boost (TOKO:DE2815) L=4.7µH Step (worth C=10µF (TOKO:DE2815) down 4 light R1=300ｋΩ, C=4.7µF LED) R2=240kΩ www.rohm.com 2011.03 - Rev.A 3/22 © 2011 ROHM Co., Ltd. All rights reserved.
-
Page 4: Short Circuit Protection
Recommend resistor value over 20kΩ between VREF5 to NON5, because VREF5 current is under 100µA. This product is not designed for normal operation with in a radioactive environment. www.rohm.com 2011.03 - Rev.A 4/22 © 2011 ROHM Co., Ltd. All rights reserved. - Page 5 Circuit Current (VCCOUT current INV1～7=1.2V , Icc2 when voltage supplied for the terminal) NON5=-0.2V This product is not designed for normal operation with in a radioactive environment. www.rohm.com 2011.03 - Rev.A 5/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 6 VBAT=3.0V VBAT=3.0V VBAT=2.5V VBAT=2.5V VBAT=2.5V 1000 Io [mA] Io [mA] Io [mA] Fig.11 CH6 13V Fig.9 CH4 1.8V Fig.10 CH5 –6.5V boost efficiency－Io step-down efficiency-Io inverting efficiency－Io www.rohm.com 2011.03 - Rev.A 6/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 7 CH2 cross converter 3.2V CH7 4LED CH3 step down 1.2V CH4 step down 1.8V Fig.20 CH7 start-up waveform Fig.21 CH1~4 waveform when OFF Fig.22 CH7 waveform when OFF (SEQ_CTL=H/L common) www.rohm.com 2011.03 - Rev.A 7/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 8 18,8,35 STB1234,5,6 H: operating over 1.5V CH7 ON/OFF Control, PWM7 PWM Dimming Input GND:CH1→CH3→CH4→CH2 SEQ_CTL Sequence control terminal VCCOUT:CH1→CH3→CH4→CH2 Terminal for connecting LED Cathode CH7 DC/DC Output www.rohm.com 2011.03 - Rev.A 8/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 9 ROHM’s IC in terms of not only static characteristic but also transient characteristic.
-
Page 10: Application Circuit
ROHM’s IC in terms of not only static characteristic but also transient characteristic. - Page 11 Technical Note BD9355MWV ●Timing chart (1) SEQ_CTL=L (GND) STB1234 Tss3 Tss4 Tss2 SEQ_CTL=H (VCCOUT) STB1234 Tss4 Tss3 Tss2 Fig.26 CH1～4 start-up sequence www.rohm.com 2011.03 - Rev.A 11/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 12 ERROR AMP output voltage is clamped during soft start DTC7(Internal node of IC） Internal node of IC Error amp output( ） Output voltage correspond to duty of input pulse ：typ. 8.2msec Fig.28 CH7 start-up sequence www.rohm.com 2011.03 - Rev.A 12/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 13 PWM7 CH7 OFF When PWM=L continued on about 300μsec OFF (wait time for CH7 OFF) DTC7 CH7 OFF Discharge by Io ：typ. 300usec Fig.31 CH7 OFF sequence www.rohm.com 2011.03 - Rev.A 13/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 14 Over voltage protection(OVP).When VO7 pin is over 28Vtyp,OVP stop CH7 function..OVP latch CH7 function and reset dy All STB=L. ●Attention of CH7 start-up In case CH7 start up, Please turn on STB1234 before CH7.CH7 can not start before CH1,2,3,4 www.rohm.com 2011.03 - Rev.A 14/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 15 (Note 1) LED current = INV7 voltage / resistance R for LED current setting PWM7 InputDUTY[%] INV7 Output Voltage [mV] Fig.33 PWM7 DUTY – INV7 Terminal Voltage www.rohm.com 2011.03 - Rev.A 15/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 16 In addition, this Load SW is provided with OCP function to prevent the IC from damage. Ensure that the IC is used within Load SW’s rated current when used normally. www.rohm.com 2011.03 - Rev.A 16/22 © 2011 ROHM Co., Ltd. All rights reserved.
-
Page 17: On/Off Logic
CH7 heve Over voltage protection (OVP).When VO7 pin is inputted over 28Vtyp, OVP stop CH7 function..OVP latch CH7 function and reset dy All STB=L www.rohm.com 2011.03 - Rev.A 17/22 © 2011 ROHM Co., Ltd. All rights reserved. - Page 18 ○Interference of power supply noise with feedback terminals (INV1～7,NON5) may cause the output voltage to oscillate. Ensure that the power supply noise’s interference is avoided by making the wiring between feedback resistor and feedback terminal as short as possible. www.rohm.com 2011.03 - Rev.A 18/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 19 (operating when CH1～4 ON/OFF switch is High) VCCOUT Hx2BAT STB1234 VREF5 PWM7 (CH5 Standard voltage output) (CH7 start signal, LED modulated light signal input) VCCOUT VCCOUT VCCOUT PWM7 VREF5 www.rohm.com 2011.03 - Rev.A 19/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 20 VCCOUT VCCOUT VCCOUT PGND567 INV7 Hx1,2BAT(Pch FET FET source terminal) Lx1,21(Nch,Pch FET drain terminal) PGND1,2 (output stage earthing terminal) Hx2BAT Lx21 PGND2 PGND1 Fig.35 PIN equivalent circuit www.rohm.com 2011.03 - Rev.A 20/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 21 GND(P-substrate), should be avoided. Transistor (NPN) Resistance (Terminal A) (Terminal B) (TerminalA) Parasitic Element P Board P Board Parasitic Parasitic Element Element Fig.. 36 Simple Structure of Bipolar IC (Sample) www.rohm.com 2011.03 - Rev.A 21/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 22 0.08 S C0.2 2.7±0.1 Direction of feed +0.05 1pin -0.04 Reel ∗ (Unit : mm) Order quantity needs to be multiple of the minimum quantity. www.rohm.com 2011.03 - Rev.A 22/22 © 2011 ROHM Co., Ltd. All rights reserved.
- Page 23 ROHM shall bear no responsibility in any way for use of any of the Products for the above special purposes. If a Product is intended to be used for any such special purpose, please contact a ROHM sales representative before purchasing.
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