rt9907 Richtek Technology Corporation, rt9907 Datasheet
rt9907
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rt9907 Summary of contents
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... Each DC-DC converter has independent enable input and soft-start function allowing versatile power sequence combination. Complete protection functions are implemented such as short circuit, over-voltage protection. The RT9907 is available in small VQFN-24L 4x4 package. Ordering Information RT9907 Package Type QV : VQFN-24L 4x4 (V-Type) ...
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... Chip Enable 4.7nF Figure 1. Typical Application Circuit for 1-cell Li+ Battery www.richtek.com 2 Preliminary V BAT 10μF 1μ VDD3 4.7μH 3 LX3 100pF 24 FB3 VDD1 17 ENM 18 RT9907 EN1 21 EN2 VDD2 22 EN3 20k 10 COMP1 10k 19 COMP2 30k 1 COMP3 1nF 5 1nF SS 1nF ...
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... COMP1 10k 19 COMP2 30k 1 COMP3 1nF 5 1nF SS 1nF 23, Exposed Pad (25) 4.7μH V BAT 13 LX1 10μ SS0520 12 I/O 3.3V/500mA 470k 9 10μ FB1 150k 16 3.3V 10μ 4.7μH 15 LX2 2.5V/300mA 100pF 470k 20 10μ FB2 220k RT9907 www.richtek.com 3 ...
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... RT9907 Function Block Diagram SS RT ENM www.richtek.com 4 Preliminary VDDM ENM Current-MODE Asynchronous Step-Up Current-MODE Soft-Start Synchronous OSC Step-Down Buck2 PWM OSC Thermal Shutdown Current-MODE Synchronous Step-Down Buck3 GND EN1 EN2 EN3 CH1 Off Off ...
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... CH3 Enable Input. Tie this pin higher than 1.3V to enable CH3. Tie below 0. EN3 turn off the CH3. 24 FB3 CH3 Feedback Input. The exposed pad must be soldered to a large PCB and connected to GND for Exposed Pad (25) GND maximum power dissipation. DS9907-07 August 2007 Preliminary Pin Function RT9907 www.richtek.com 5 ...
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... RT9907 Absolute Maximum Ratings Supply Input Voltage DDM LX1 Pin Switch Voltage ------------------------------------------------------------------------------------------ LX2 Pin Switch Voltage ------------------------------------------------------------------------------------------ LX3 Pin Switch Voltage ------------------------------------------------------------------------------------------ Other I/O Pin Voltage --------------------------------------------------------------------------------------------- Power Dissipation 25° VQFN-24L 4x4 ----------------------------------------------------------------------------------------------------- 1.85W Package Thermal Resistance (Note 3) VQFN-24L 4x4, θ ------------------------------------------------------------------------------------------------ 54°C/W JA Junction Temperature Range ------------------------------------------------------------------------------------ 0°C to 125°C Lead Temperature (Soldering, 10 sec.) ----------------------------------------------------------------------- 260° ...
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... VDD1 N-MOSFET, V VDD2 R DS(ON) P-MOSFET 3.3V VDD2 V = 3.3V VDD2 N-MOSFET, V VDD3 R DS(ON) P-MOSFET 3.3V VDD3 V = 3.3V VDD3 V = 3.3V VDDM V = 3.3V VDDM T SD Δ 25° low effective thermal conductivity test board of A RT9907 Min Typ Max 475 550 625 -- 100 -- -- 100 0.788 0.8 0.812 -- -- -- 0 300 400 2 2.6 = 3.3V -- 350 ...
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... RT9907 Typical Operating Characteristics Reference Voltage vs. Temperature 0.808 0.806 0.804 0.802 0.8 0.798 0.796 0.794 0.792 -50 -30 -10 10 Temperature Boost Efficiency vs. Output Current 100 V = 3.3V OUT Output Current (mA) Boost Output Voltage vs. V 3.332 V = 2.5V 3.3V, I BAT DD1 3.33 3.328 3.326 3.324 3.322 3 ...
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... Time (1ms/Div) Boost LX & Output Ripple V = 1.8V 3.3V OUT Time (1us/Div) DS9907-07 August 2007 Preliminary = 100mA to 400mA OUT = 100mA to 400mA OUT = 300mA OUT RT9907 Boost Load Transient Response V = 2.5V 3.3V 100mA to 400mA IN OUT OUT Time (1ms/Div) Boost LX & Output Ripple V = 1.8V 3.3V 100mA IN ...
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... RT9907 Boost LX & Output Ripple V = 2.5V 3.3V OUT Time (1us/Div) Boost LX & Output Ripple 3.3V OUT Time (1us/Div) Buck2 Efficiency vs. Output Current 100 V = 1.8V OUT 4 Output Current (mA) www.richtek.com 10 Preliminary = 400mA OUT = 400mA OUT = 2. 3.8V IN ...
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... V Voltage (V) DDM Buck2 Load Transient Response @I = 100mA to 400mA OUT 3.3V 1.8V DD2 DDM OUT Time (1ms/Div) Buck2 Load Transient Response @I = 100mA to 400mA OUT V = 4.5V 3.3V, V DD2 DDM OUT Time (1ms/Div) RT9907 Voltage DDM 4 1.8V www.richtek.com 11 ...
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... RT9907 Buck2 LX & Output Ripple @I = 500mA OUT V = 2.5V 3.3V, V DD2 DDM Time (500ns/Div) Buck2 LX & Output Ripple @I = 250mA OUT 3.3V, V DD2 DDM Time (500ns/Div) Buck2 LX & Output Ripple @I = 250mA OUT V = 3.8V 3.3V, V DD2 DDM Time (500ns/Div) www.richtek.com 12 Preliminary = 1.8V OUT = 1.8V OUT = 1.8V OUT Buck2 LX & Output Ripple ...
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... Time (500ns/Div) Buck3 Efficiency vs. Output Current 100 V = 1.8V OUT 4. 3. Output Current (mA) Buck3 Output Voltage vs. V 1.806 3.3V 250mA BAT DDM OUT 1.804 1.802 1.8 1.798 1.796 1.794 1.792 1.79 2 2.5 3 3.5 V Voltage (V) DD3 RT9907 = 1. 100 1000 Voltage DD3 4 4.5 www.richtek.com 13 ...
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... RT9907 Buck3 Output Voltage vs. V 1.806 V = 3.3V 250mA DD3 OUT 1.804 1.802 1.8 1.798 1.796 1.794 1.792 1.79 2 2.5 3 3.5 V Voltage (V) DDM Buck3 Load Transient Response @I = 100mA to 400mA OUT 3.3V, V DD3 DDM Time (1ms/Div) Buck3 Load Transient Response @I = 100mA to 400mA OUT V = 4.5V 3.3V, V DD3 ...
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... Time (500ns/Div) Buck3 LX & Output Ripple @I = 500mA OUT V = 3.8V 3.3V, V DD3 DDM Time (500ns/Div) DS9907-07 August 2007 Preliminary = 1.8V OUT = 1.8V OUT = 1.8V OUT RT9907 Buck3 LX & Output Ripple @I = 250mA OUT 3.3V 1.8V DD3 DDM OUT Time (500ns/Div) Buck3 LX & Output Ripple @I = 250mA OUT V = 3.8V 3.3V ...
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... RT9907 Buck3 LX & Output Ripple @I = 500mA OUT V = 4.5V 3.3V, V DD2 DDM Time (500ns/Div) www.richtek.com 16 Preliminary = 1.8V OUT DS9907-07 August 2007 ...
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... Application Information The RT9907 is a three-channel DC/DC converter with one voltage detector for digital still cameras and other hand- held device. The three channels DC/DC converters are as follows: CH1: Step-up, asynchronous current mode DC/DC converter with an internal power MOSFET, current limit protection and high efficiency control for wide loading ...
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... RT9907 Protection Current limit (CH2, CH3) The current of high-side PMOS is sensed cycle by cycle to prevent over current. If the current is higher than 1.5A (typical), then the high-side PMOS is off and the low-side NMOS is on. This state is latched and then reset automatically at next clock cycle. ...
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... Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com DETAIL A Pin #1 ID and Tie Bar Mark Options Dimensions In Inches Min Max 0.031 0.039 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 RT9907 1 2 www.richtek.com 19 ...