Regulators ICs for Digital Cameras and Camcorders Switching Regulator IC with Built-in FET (5V) No.10036EAT09 BD9757MWV 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 (6mm6mm ,0.4mm pitch) with heat dissipation Applications Digital still camera Absolute maximum ratings (Ta=25) Parameter Symbol Ratings Units Power Supply Voltage VBAT -0.3 ~ 7 V VHx1 ~ 5 -0.3 ~ 7 V Power Input Voltage HS78H -0.3 ~ 7 V VLx7,8 -0.3 ~ 22 V IomaxLx1 2.5 A IomaxHx1 1.5 A IomaxHx2,5 +1.0 A Maximum output current IomaxHx3,4 +0.8 A IomaxHS78 +1.2 A IomaxLx7,8 1.0 A ( 1) Power Dissipation Pd 0.54 W 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/. www.rohm.com 2010.11 - Rev.A 1/20 2010 ROHM Co., Ltd. All rights reserved. Technical Note BD9757MWV Operating conditions Ratings Parameter Symbol Unit conditions Min. Typ. Max. Power supply voltage VBAT 1.5 - 5.5 V VREF terminal connection capacity CVREF 0.47 1.0 4.7 F VREGA terminal connection capacity CVREGA 0.47 1.0 4.7 F CH8 modulated light H fixed time when the modulated 265X T - - sec ON light control setting is determined 1/fosc1 256X L fixed time when OFF T - - sec OFF 1/fosc1 H fixed time at the time of T 500 - 10000 nsec H modulated light control setting L fixed time at the time of T 500 - 10000 nsec L modulated light control setting 4X H fixed time at the time of EN starting up T - - sec EN 1/fosc1 L fixed time 7X 255X T - sec CLR before modulated light control setting 1/fosc1 1/fosc1 Time of light control setting 2048X T - - sec SET at the time of starting up 1/fosc1 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 Idnl6 - - 0.8 A Output voltage setting range CH1 - 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 www.rohm.com 2010.11 - Rev.A 2/20 2010 ROHM Co., Ltd. All rights reserved.