RT9953 RICHTEK [Richtek Technology Corporation], RT9953 Datasheet

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... CH Power Management IC General Description The RT9953 is a complete power supply solution for digital still cameras and other handheld devices. The RT9953 is a multi-CH power management IC including one synchronous step-up DC/DC converter, one selectable synchronous step-up/step-down DC/DC converter, two synchronous step-down DC/DC converters, and one low dropout linear regulator ...

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... RT9953 Typical Application Circuit For 2AA V BAT V OUT_CH2 5V C5 10µ 3.6V V OUT_CH4 1.8V C11 R7 10µF 470k R8 374k 3.6V www.richtek.com 2 RT9953 L2 2.2µH 18 LX2 C4 10µF PVDD1 2 17 PVDD2 R3 470k 21 FB2 R4 88.7k 6 PVDD4 PVDD3 C10 10µF L4 4.7µH 7 LX4 C12 33pF 4 FB4 19 V BAT SEL ...

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... 10µ 4.7pF 470k 22 FB1 R2 88. 10µF L3 4.7µH LX3 10µF 22pF 768k 15 FB3 R6 360k 11 C13 1µF C14 C15 R9 1µF 10pF 47k 10 FB5 R10 SS 5 22.1k C17 0.47nF RT9953 V BAT V OUT_CH1 5V V BAT V OUT_CH3 2.5V V BAT V OUT_CH5 2.5V www.richtek.com 3 ...

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... RT9953 Table 1. Recommended Components for the Typical Application Circuit Channel Formula V (V) 3.3 OUT_CH3 4 86 27.4 C9 (pF Channel Application 3.3 V (V) OUT_CH4 4 86 27.4 C12 (pF) 22 C11 ( F) 10 Channel Formula V OUT_CH5 V (V) OUT_CH5 R10 (k ) C15 (pF) C14 ( F) www.richtek.com 4 CH3 V = (1+R5/R6 ...

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... Enable Control Input of CH4. Feedback Input of CH2. High impedance in shutdown mode. Feedback Input of CH1. High impedance in shutdown mode. Ground Pin. The exposed pad must be soldered to a large PCB and connected to GND for maximum thermal dissipation. Enable Control Input of CH1. RT9953 Pin Function www.richtek.com 5 ...

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... RT9953 Function Block Diagram PVDD2 LX2 FB2 PVDD4 LX4 FB4 EN1 EN2 EN3 EN4 EN5 SEL www.richtek.com 6 VDDM CH2 CH1 C-Mode C-Mode Step-Up or Step-Up Step-Down - + 0.8V REF CH4 CH3 C-Mode C-Mode Step-Down Step-Down - + 0.8V VDDM REF Enable Mode CH5 Sequence LDO PVDD1 LX1 ...

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... DS9953-02 April 2011 (Note 1) (Note 4) Symbol Test Conditions V DDM PVDD5 I All OFF I Non Switching, EN1 = 3. Non Switching, EN2 = 3. Non Switching, EN3 = 3. Non Switching, EN4 = 3. EN5 = 3.3V 0mA Q5 OUT RT9953 Min Typ M ax Unit 2.7 -- 5 5.7 6 6.25 V 2 800 ...

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... RT9953 Parameter Oscillator CH1,2,3,4 Operating Frequency CH1 Maximum Duty Cycle (Step-Up) CH2 Maximum Duty Cycle (Step-Up) CH2 Maximum Duty Cycle (Step-Down) CH3 Maximum Duty Cycle (Step-Down) CH4 Maximum Duty Cycle (Step-Down) Feedback Regulation Voltage Feedback Regulation Voltage @ FB1, FB2, FB3, FB4, FB5 ...

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... I < 300mA LOAD OUT PSRR C = 1uF 100mA OUT OUT T SD ΔT SD “ ” Absolute Maximum Ratings may cause permanent damage to the device. These = high effective four layers thermal conductivity test A RT9953 Min Typ Max Unit 1 ...

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... RT9953 Typical Operating Characteristics CH1 Step-Up Efficiency vs. Output Current 100 Output Current (mA) CH2 Step-Down Efficiency vs. Output Current 100 1.8V BAT BAT V = 3.3V BAT 3.6V BAT 4.2V BAT V = 4.5V BAT 4 Output Current (mA) CH3 Step-Down Efficiency vs ...

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... Output Current (mA) 1.210 1.208 1.205 1.203 1.200 1.198 1.195 1.193 1.190 0 200 400 600 Output Current (mA) 1.85 1.84 1.83 1.82 1.81 1.80 1.79 1.78 0 100 200 300 Output Current (mA) RT9953 = 1.2V, OUT_CH4 1000 BAT V = 4.5V BAT DDM 800 1000 V = 4.5V BAT BAT V = 2.7V BAT DDM 400 500 600 www ...

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... RT9953 CH4 Step-Down Output Voltage vs. Output Current 3.50 3.45 3.40 3.35 3.30 3.25 3.20 3.15 0 100 200 Output Current (mA) CH2 Step-Down Output Voltage Ripple LX2 (2V/Div) V OUT_CH2_ac (5mV/Div 5V, V DDM I = 300mA 2.2μ 10μF OUT Time (500ns/Div) CH3 Output Voltage Ripple LX3 (2V/Div) V OUT_CH3_ac (5mV/Div 5V, V DDM I = 300mA 4.7μ 10μF ...

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... CH3 Load Transient Response 3.7V, V DDM BAT I = 50mA to 300mA 4.7μ 10μF OUT Time (1ms/Div) Frequency vs. Temperature 1050 1030 1010 990 970 950 930 910 890 870 V 850 -40 -30 -20 - Temperature (°C) RT9953 = 1.2V, = 1.8V, OUT_CH3 = 3V DDM BAT www.richtek.com 13 ...

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... RT9953 CH5 LDO Output Voltage vs. Output Current 2.55 2.54 2.53 2.52 2.51 2.50 2.49 2.48 2.47 2.46 2.45 0 100 200 Output Current (mA) CH5 LDO Load Transient Response I LOAD (200mA/Div) V OUT_CH5_ac (10mV/Div 5V, V DDM I = 1mA to 300mA, C14 = 1μF OUT Time (1ms/Div) CH5 LDO PSRR 0 -10 -20 -30 -40 - BAT V = 3.7V BAT -60 - 5V, C14 = 1μF, I ...

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... The CH2 is a synchronous step-up/step-down selectable converter for motor or DSC system I/O power. Mode setting The CH2 of RT9953 features flexible Step-up or Step-down topology setting for either 1 x Li-ion application by SEL pin. Please refer to “Electrical Characteristics” for level of Logic-High or Logic-Low. When the CH2 operates as a Step-up converter, the SEL must be set at Logic-High ...

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... J(MAX) temperature the ambient temperature and the A the junction to ambient thermal resistance. For recommended operating conditions specification of RT9953, the maximum junction temperature is 125 C. The junction to ambient thermal resistance dependent. For WQFN-24L 4x4 package, the thermal resistance is 54 C/W on the standard JEDEC 51-7 JA four layers thermal test board ...

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... V GND OUT2_CH2 LX2 18 C4 PVDD2 V 17 BAT C16 16 VDDM R5 FB3 EN2 14 25 PVDD3 V 13 BAT GND C15 L3 C8 R10 V OUT3_CH3 Connect the Exposed C13 Pad to a ground plane. RT9953 www.richtek.com 17 ...

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... RT9953 Protection type Refer to Electrical spec Over Voltage V V DDM DDM Protection Current Limit N-MOSFET current > 3A CH1 Step-Up PVDD1 OVP PVDD1 > 6V Current Limit N-MOSFET current > 3A CH2 Step-Up PVDD2 OVP PVDD2 > 6V OCP P-MOSFET current > 1.5A CH2 Step-Down UVP FB2 < 0.4V OCP P-MOSFET current > ...

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... Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0.028 0.031 0.000 0.002 0.007 0.010 0.007 0.012 0.156 0.159 0.091 0.108 0.156 0.159 0.091 0.108 0.020 0.014 0.018 RT9953 1 2 www.richtek.com 19 ...