RT9986 RICHTEK [Richtek Technology Corporation], RT9986 Datasheet

Page 1

... DC/DC Converter for DSC General Description The RT9986 is a complete power supply solution for digital still cameras and other handheld devices. It includes one synchronous step-up DC/DC converter with load disconnect, one selectable synchronous step-up/step- down DC/DC converter, two synchronous step-down DC/ DC converters, one synchronous high voltage step-up DC/ ...

Page 2

... RT9986 Ordering Information RT9986 Package Type QW : WQFN-32L 4x4 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Note : Richtek products are : RoHS compliant and compatible with the current require- ments of IPC/JEDEC J-STD-020. Suitable for use in SnPb or Pb-free soldering processes. www.richtek.com 2 Pin Configurations ...

Page 3

... FB2 R4 150k L2 2.2µH LX2 26 C5 4.7µF PVDD3 15 C7 4.7µF L3 2.2µH LX3 768k 10µF 14 FB3 R6 360k 10 PVDD4 C9 10µF L4 2.2µH LX4 9 R7 C10 470k 10µF FB4 11 R8 374k 22 C11 Super Cap 33 (Exposed Pad) GND RT9986 5V 3.3V V BAT 5V 2. BAT 1.8V www.richtek.com 3 ...

Page 4

... C13 10µ -7V C18 C15 10µ 1nF C16 0.1µF V BAT RTCPWR R15 100k 3.3V www.richtek.com 4 21 VDDM C1 1µF 29 BAT C2 RT9986 4.7µF L5 10µH 20 LX5 C14 4.7µF 19 PVDD5 C12 R9 27pF 287k 18 FB5 R10 26.1k 4 VOUT6 D1 28 LX6 L6 10µH R11 66.5k 3 FB6 R12 10 ...

Page 5

... Power Off Sequence : CH6 INV −7V → CH5 HV Step-Up 15V EN56 CH5 VOUT CH6 VOUT DS9986-00 May 2011 3.5ms 3.5ms 3.5ms 10ms Constant Current Pre-Charge. 10ms RT9986 Wait until FB3 < 0.1V Wait until FB4 < 0.1V Wait until FB2 < 0.1V Discharge by internal N-MOSFET Wait until VOUT6 close to 0V www.richtek.com 5 ...

Page 6

... RT9986 Functional Pin Description Pin No. Pin Name 1 FB1 2 VREF 3 FB6 4 VOUT6 5 FB7 6 PVDD7 7 LX7 8 EN7 9 LX4 10 PVDD4 11 FB4 12 VCHK 13 VNEG 14 FB3 15 PVDD3 16 LX3 17 RST 18 FB5 19 PVDD5 20 LX5 21 VDDM 22 RTCPWR 23 SYSR 24 FB2 25 EN1234 26 LX2 27 PVDD2 28 LX6 29 BAT 30 PVDD1 31 LX1 32 EN56 33 (Exposed pad) GND www ...

Page 7

... PVDD1 Body Diode BAT CH1 Control LX1 - FB1 + 0.8V REF PVDD2 Body Diode BAT CH2 Control LX2 - FB2 + 0.8V REF VDDM PVDD3 CH3 C-Mode LX3 Step-Down - FB3 + 0.8V REF VDDM PVDD4 CH4 C-Mode LX4 - FB4 + 0.8V REF VDDI RTC_LDO RTCPWR W/ Body Diode Control RT9986 www.richtek.com 7 ...

Page 8

... RT9986 Absolute Maximum Ratings Supply Input Voltage, VDDM, BAT --------------------------------------------------------------------- −0. VOUT6 -------------------------------------------------------------------------------------------------------- −10V to 0.3V LX1, LX2, LX3, LX4 ----------------------------------------------------------------------------------------- −0. PVDD5, LX5 ------------------------------------------------------------------------------------------------- −0.3V to 24V PVDD7, LX7 ------------------------------------------------------------------------------------------------- −0.3V to 17V LX6 ------------------------------------------------------------------------------------------------------------- (BAT − 14V) to (BAT + 0.3V) Other Pins ---------------------------------------------------------------------------------------------------- −0. Power Dissipation 25° WQFN 32L 4x4 ---------------------------------------------------------------------------------------------- 3.590W Package Thermal Resistance (Note 2) WQFN 32L 4x4, θ ...

Page 9

... V = 0.15V FB7 FB5 V FB6 FB7 LX7 V REF 0μA < I < 200μA REF V = 3.3V PVDD1 R DS(ON 3.3V PVDD1 I LIM1 V = 3.3V PVDD2 R DS(ON 3.3V PVDD2 I LIM2_D I LIM2_U RT9986 Min Typ Max = 3. 800 = 3. 800 = 3. 800 = 3. 800 = 800 1800 2000 2200 900 1000 1100 ...

Page 10

... RT9986 Parameter P-MOSFET CH3 On Resistance N-MOSFET CH3 Current Limitation (Step-Down) P-MOSFET CH4 On Resistance N-MOSFET CH4 Current Limitation (Step-Down) P-MOSFET CH5 On Resistance N-MOSFET CH5 Current Limitation of N-MOSFET CH6 On Resistance of P-MOSFET CH6 Current Limitation of P-MOSFET P-MOSFET CH7 On Resistance N-MOSFET CH7 Current Limitation of N-MOSFET ...

Page 11

... SYSR to go low V = 0.5V SYSR VCHK Falling VCHK V = 0.5V, V RST VCHK V = 4.2V DDM I = 0mA OUT V = 4.2V DDM I = 50mA OUT I = 10mA OUT I = 3mA OUT = 25° high-effective thermal conductivity four-layer test board of JEDEC A RT9986 Min Typ Max 125 160 -- -- 20 -- 0.709 0.72 0.731 -- 1.57 1.6 1. ...

Page 12

... RT9986 Typical Operating Characteristics CH1 Step-Up Efficiency vs. Output Current 100 4.5V BAT V = 4.2V BAT 3.9V BAT 3.6V BAT V = 3.3V BAT BAT 5V 2.2μH, C OUT 0 10 Output Current (mA) CH2 Step-Up Efficiency vs. Output Current 100 ...

Page 13

... OUT Output Current (mA) CH1 Step-Up Output Voltage vs. Output Current 5.20 5.15 5.10 5.05 5.00 4.95 4.90 4.85 4.80 0 100 200 300 Output Current (mA) CH2 Step-Up Output Voltage vs. Output Current 5.10 5.08 5.06 5.04 5.02 5.00 0 100 200 300 Output Current (mA) RT9986 V = 4.2V BAT V = 3.9V BAT V = 3.6V BAT V = 3.3V BAT BAT V = 2.7V BAT V = 4.5V BAT V = 2.5V BAT V = 2.2V BAT BAT = 10μ OUT ...

Page 14

... RT9986 CH2 Step-Down Output Voltage vs. Output Current 3.36 3.34 V BAT 3.32 V BAT 3.30 3.28 3.26 0 100 200 300 Output Current (mA) CH4 Step-Down Output Voltage vs. Output Current 1.006 1.004 1.002 1.000 0.998 0.996 0.994 0.992 0 100 200 300 Output Current (mA) CH6 Inverting Efficiency vs. Output Current -8.190 V BAT V BAT -8 ...

Page 15

... OUT Power On Sequence Time (5ms/Div) CH1 Output Voltage Ripple LX1 400mA 2.2μH, C OUT Time (500ns/Div) CH3 Output Voltage Ripple LX3 V BAT I = 400mA 2.2μH, C OUT Time (500ns/Div) RT9986 V = 3.7V BAT = 3.7V 5V, BAT OUT = 10μ OUT = 3.7V 1.8V, OUT = 10μF OUT www.richtek.com 15 ...

Page 16

... RT9986 CH4 Output Voltage Ripple LX4 (2V/Div) V OUT_CH4_ac (5mV/Div 400mA 2.2μH, C OUT Time (500ns/Div) CH6 Output Voltage Ripple LX6 (10V/Div) V OUT_CH6_ac (10mV/Div 50mA 10μH, C OUT Time (1μs/Div) CH2 Load Transient Response I OUT (100mA/Div) V OUT_CH2_ac (50mV/Div 300mA 2.2μH, C OUT Time (1ms/Div) www ...

Page 17

... C OUT Time (1ms/Div) DS9986-00 May 2011 I OUT (20mA/Div) V OUT_CH5_ac (50mV/Div 3.7V 1V, BAT OUT = 10μF OUT = −8V 3.7V, V BAT OUT = 10μ OUT RT9986 CH5 Load Transient Response V = 3.7V, V BAT OUT 30mA, C OUT OUT Time (1ms/Div) www.richtek.com = 16V, = 10μF 17 ...

Page 18

... RT9986 Application Information The RT9986 is a multiple output power supply system for digital still cameras and other small handheld devices. It includes six DC/DC converters as well as one WLED driver, one RTC LDO, one voltage detector, and one system reset. The WLED works in either current source mode or step- up mode ...

Page 19

... R11 and R12 are the feedback resistors connected DS9986-00 May 2011 to FB6, 1.2V equals to (V REF typical. Reference Voltage The RT9986 provides a precise 1.8V reference voltage with souring capability of 100 A. Connect a 0.1 F REF ceramic capacitor from the VREF pin to GND. Reference voltage is enabled by pulling EN6 to logic-high. ...

Page 20

... BAT and PVDD1 to create the internal node voltage VDDI and VDDM. VDDM is the power of all the RT9986 control circuits and must be connected to an external decoupling capacitor by way of the VDDM pin. The VDDI is the power input of the RTC LDO ...

Page 21

... C20 C19 GND V OUT_CH4 C10 R7 R8 GND Input/Output capacitors must be placed as close as possible to the Input/Output pins. DS9986-00 May 2011 Layout Consideration Four-Layers PCB For the best performance of the RT9986, the following PCB layout guidelines must be strictly followed 100 125 } } OUT_CH1 ...

Page 22

... RT9986 Threshold (typical) Protection Refer to Electrical type BAT UVLO BAT < 1.3V OVP VDDM > 6V VDDM UVLO VDDM < 2.4V Current N-MOSFET Limit Current > 3A PVDD1 PVDD1 > 6V OVP PVDD1 < (BAT CH1 PVDD1 or PVDD1 < 1.28V after Step-Up UVP soft-start end. FB1 FB1 UVP soft-start end. ...

Page 23

... P-MOSFET off. P-MOSFET off. IC Shutdown when OL occur each cycle until 100ms. N-MOSFET off, P-MOSFET off. Automatic reset at next clock cycle. Shutdown CH7 All channels stop switching RT9986 IC Shutdown Reset method Delay time VDDM power 100ms reset or all enable pins set to low ...

Page 24

... RT9986 Outline Dimension Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time ...