rt9212 Richtek Technology Corporation, rt9212 Datasheet
rt9212
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rt9212 Summary of contents
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... Dual 5V Synchronous Buck PWM DC-DC and Linear Power Controller General Description The RT9212 is a 3-in-one power controller delivers high efficiency and tight regulation from two voltage regulating synchronous buck PWM DC-DC and one linear power controllers. The RT9212 can control two independent output voltages adjustment in range of 0 ...
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... Q5 Q6 RESET2 RESET1 3.3V C4 100uF 2SD1802 V OUT3 C6 2.5V C5 100pF R3 470uF 255 120 R7 1.25k www.richtek.com 2 Preliminary C3 R9 10k 1uF RT9212 19 15 VCC PGOOD 21 2 OCSET1/SD BOOT1 20 1 OCSET2/SD UGATE1 3 PHASE1 16 DRV 22 PVCC1 17 FBL 23 LGATE1 24 6 PGND1 COMP1 11 C7 BOOT2 5.6nF 12 ...
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... Connect this pin to the external resistor divider network of the linear regulator. FB2 (Pin 18) Channel 2 feedback voltage. This pin is the inverting input of the error amplifier. FB2 senses the channel 2 through an external resistor divider network. RT9212 www.richtek.com 3 ...
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... RT9212 PGOOD (Pin 19) PGOOD is an open-drain output used to indicate that both the channel 1 and channel 2 regulators are within normal operating voltage ranges. OCSET2/SD (Pin 20), OCSET1/SD (Pin 21) Connect a resistor (R ) from this pin to the drain of OCSET the upper MOSFET of the supply voltage sets the over- current trip point internal 40μ ...
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... UGATE1 & 2, LGATE1 & 2 Open (OCSET1/SD, OCSET2/SD CCSD V OCSET1/SD, OCSET2/SD V CCRTH V Rising OCSET1/SD, OCSET2/SD CCHYS Δ VEAR REF OSC CC ΔV OSC GBW SR COMP = 10pF RT9212 − 65°C to 150°C Min Typ CC 4.5V 3.7 4.1 -- 0 0.784 0.8 0.816 275 300 -- 1 continued www ...
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... RT9212 Parameter V2 Error Amplifier (Internal Compensation) DC Gain Linear Regulator DRV Driver Source PWM Controller Gate Drivers Upper Gate Source (UGATE1 and 2) Upper Gate Sink (UGATE1 and 2) Lower Gate Source (LGATE1 and 2) Lower Gate Sink (LGATE1 and 2) Upper Gate Rising Time (UGATE1 and 2) T ...
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... DS9212-05 March 2007 Preliminary V CC (5V/Div) V OUT1 (2V/Div) V OUT2 (2V/Div) PGOOD (5V/Div) V OUT1 (2/Div) V OUT2 (2/Div) UGATE1 (10/Div) UGATE2 (5V/Div) LGATE1 (5V/Div) LGATE2 (5V/Div) RT9212 Power Good Falling Time (25ms/Div) Power Off OUT1 OUT2 Time (500us/Div) LGATE Phase Shift Time (1us/Div) www.richtek.com 7 ...
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... RT9212 Bootstrap UGATE1 (5V/Div) LGATE1 (5V/Div) Time (1us/Div) V OUT1 V OUT1 (2V/Div) UGATE1 (10V/Div) LGATE1 (5V/Div) Time (5ms/Div) V OUT1 V OUT1 (100mV/Div) I OUT1 (5A/Div 5V 3.3V OUT Time (250us/Div) www.richtek.com 8 Preliminary UGATE2 (5V/Div) LGATE2 (5V/Div) Short V (1V/Div) LGATE2 (5V/Div) UGATE2 (10V/Div) Transient (10mV/Div) (5A/Div) = 3000μ ...
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... OUT2 Time (5ms/Div) Frequency vs. Temperature 315 310 305 300 295 290 285 -40 - Temperature (°C) Reference vs. Temperature 0.808 V 0.806 OUT1 0.804 0.802 0.8 0.798 0.796 V OUT2 0.794 0.792 0.79 0.788 -40 - Temperature (°C) RT9212 60 80 100 120 60 80 100 120 www.richtek.com 9 ...
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... One of the parameters limiting the converter's response to a load transient is the time required to change the inductor current. Given a sufficiently fast control loop design, the RT9212 will provide 0% to 100% duty cycle in response to a load transient. www.richtek.com 10 ...
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... GS ) and thermal Feedback Compensation DS(ON) The RT9212 is a voltage mode controller; the control loop is a single voltage feedback path including an error amplifier and PWM comparator as Figure 1 shows. In order to achieve fast transient response and accurate output regulation, a adequate compensator design is necessary. The goal of ...
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... ESR zero but less than 1/5 of the switching frequency. The second pole be place at half the switching frequency. 1 × × ESR O and FB1 - EA + COMP1 RT9212 VREF Figure π × × π × ...
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... Reference Voltage Because one of the RT9212 regulators uses a low 35dB gain error amplifier, shown in Figure 4. The voltage regulation is dependent reference voltage of 0.8V is trimmed 2.5V condition fixed V OUT FB reference voltage vs. V voltage can be calculated OUT as Figure REF 0.8V 1.9V Figure 4 ...
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... RT9212 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 www.richtek.com 14 Preliminary Dimensions In Millimeters Min Max 0.850 1.200 0.050 0.150 0.800 1.050 0.190 0.300 7.700 7 ...