ROHM BD7700GU Technical data
A
System LED Drivers for Mobile Phones
Charge Pump type
for Flash
BD7700GU
●Description
BD7700GU is a maximum of 300mA LED flash (three-channel total) driver IC. Flash mode and torch mode are controllable
by two external control signals. The flash mode timer ability for a maximum of 1s is carried, and management of flash
lighting time is easy and safe.
●Features
1) Current regulation for LED
2) 3ch High side current Driver
3) Flash LED High side Current driver (Max 100mA@1ch)
4) Torch LED High side Current driver (Max 20mA@1ch)
5) Indicate LED High side Current driver (Max 1mA)
6) High efficiency up to 80%
7) 2port control Flash and Torch and Indicate mode
8) Charge pump step-up DC/DC converter (Max 300mA) Three charge pump mode (×1, ×1.5, ×2.0)
9) Automatically transition to each mode
10) Over-voltage protection / In rush current prevention (soft start) / Over current limiter
11) Under Voltage Lockout threshold / Thermal shutdown
12) Small and thin CSP package
●Applications
Flash and torch of camera for mobile phone
●Absolute Maximum Ratings (Ta=25℃)
No.11041EAT19
Parameter Symbol Ratings Unit
Maximum applied voltage VMAX 7 V
Input voltage Vdin GND-0.3 ~ VBAT+0.3 V
Power dissipation Pd 1062.5 (Note1) mW
Operating temperature range Topr -30 ~ +85 ℃
Storage temperature range Tstg -55 ~ +150 ℃
(Note1) The measurement value, which was mounted on the PCB by ROHM.
Temperature deleting : 8.5mW/℃ from Ta>25℃
●Operating conditions (Ta=-30 ~ 85℃)
Parameter Symbol Ratings Unit
Battery Power Supply voltage VBAT 2.7 - 5.5 V
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BD7700GU
●Electrical Characteristics
(Unless otherwise noted, Ta = 25℃, VBAT=3.6V)
Parameter Symbol
Logic control terminal
Low threshold voltage VthL2 - - 0.4 V CNT0 and CNT1 port
High threshold voltage VthH2 1.2 - - V CNT0 and CNT1 port
High level Input current IinH2 - 18.3 33 μA CNT0 or CNT1 = 5.5V
Low level Input current IinL2 -1 0 - μA CNT0 or CNT1 = 0V
DC/DC Converter
Quiescent Current Iq - 0.1 1.0 μA CNT0 and CNT1 = ‘0’
Flash Current Accuracy Iflash -15 0 15 % 100mA
Torch Current Accuracy Itorch -15 0 15 % 20mA
Indicate Current Accuracy Iind -30 0 30 % 1mA,LED2 Terminal
Min. Typ. Max.
Limits
Units Condition
Technical Note
Current Consumption 1 Idd1 - 1.0 2.0 mA X1.0 mode, LED current = 0mA
Current Consumption 2 Idd2 - 6.0 9.0 mA X1.5 mode, LED current = 0mA
Current Consumption 3 Idd3 - 9.0 12.0 mA X2.0 mode, LED current = 0mA
ISET Voltage Viset 0.5 0.6 0.7 V
Switching frequency Fsw 1.0 1.25 1.5 MHz
Sat Voltage Vsat 150 250 350 mV VOUT-LED Voltage(VLED=3V)
Over voltage protection Vovp 5.5 - - V VOUT Limit
Under voltage lock-out Vuvlo 1.8 2.0 2.2 V UVLO Detect Voltage
Start up time Tstart - - 3 ms Stand by → Torch,Flash,Indicate
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© 2011 ROHM Co., Ltd. All rights reserved.
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2011.04 - Rev.
A
BD7700GU
●Package Outline
Technical Note
Fig.1. Package outline
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© 2011 ROHM Co., Ltd. All rights reserved.
Fig.1. Package outline
3/12
2011.04 - Rev.
A
BD7700GU
●Block Diagram
Technical Note
C1 C2
C1N C1P C2N C2P
VBAT
CIN
CNT0
CNT1
●Pin Location
CHPREG
DIGTOP
CHP_TOP
OSC
REF_DP
VOUTDET
GND
C1, C2, CIN : 2.2µF
COUT :4.7µF
Fig-2. Block Diagram
Bottom View
LEDDRVTOP
LEDDRV
LEDDRV
LEDDRV
ISETDRV
VOUT
COUT
LED1
LED2(Indicate out)
LED3
ISET
RSET
D C1N C2N C2P C1P
C GND CNT0 CNT1 VBAT
BISET LED3 VOUT
A GND VBAT LED2 LED1
1234
Fig-3. Pin Location
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© 2011 ROHM Co., Ltd. All rights reserved.
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2011.04 - Rev.
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