rt9202 ETC-unknow, rt9202 Datasheet
rt9202
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rt9202 Summary of contents
Page 1
... MOSFET in a synchronous buck topology. The IC integrates the control, output adjustment, monitoring and protection functions in a small 8-pin package. The RT9202 uses a low gain voltage mode PWM control for simple application design. An internal 0.8V reference allows the output voltage to be precisely regulated to low voltage requirement. A fixed 300kHz oscillator reduces the component size for saving board space ...
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... BOOT PHASE 7 2 UGATE OCSET V OUT RT9202 2. GND VCC LGATE 1µF 120 255 C6 10nF Fig.1 RT9202 powered from 5V only R1 20K BOOT PHASE 1µ UGATE OCSET V OUT RT9202 2. GND VCC LGATE 1µF ...
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... CVCC 1µF Layout Notes 1. Put CIN1 & CIN2 to be near the MU drain and ML source nodes. 2. Put RT9202 to be near the COUT 3. Put CBOOT as close as to BOOT pin 4. Put CVCC as close as to VCC pin DS9202-02 August 2002 + COUT 1000µF L 5µH ...
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... RT9202 Function Block Diagram VCC Bias 0.8V Reference 0.8V Error FB _ GND www.richtek.com 4 Power on Reset Soft Start 1V _ OVP _ UVP 0.5V 35dB PWM Error _ Amp 300kHz Oscillator 6.0V Regulator 40µ Control Logic VCC DS9202-02 August 2002 BOOT OCSET UGATE PHASE LGATE ...
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... GND−0. 0.625W 160°C/W 0°C ~ +70°C -40°C ~ +125°C -65°C ~ +150°C 260°C Min Typ -- 3.85 4.1 0.3 0.5 0.8 1.25 0.784 0.8 250 300 -- 1. 1V RT9202 7V Max Units 4.35 V 0.7 V 2.0 V 0.816 V 350 KHz -- V P Ω 11 Ω 7.5 Ω 6 Ω continued www.richtek.com 5 ...
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... MOSFET gate. This pin provides the gate drive for the lower MOSFET. VCC (Pin 5) This is the main bias supply for the RT9202. This pin also provides the gate bias charge for the lower MOSFETs gate. The voltage at this pin monitored for power-on reset (POR) purpose ...
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... OUT Time Load Transient UGATE V OUT Time DS9202-02 August 2002 LGATE OUT 2.2V OUT C = 3000µF OUT RT9202 Dead Time V CC UGATE LGATE Time Power Off 2.2V V OUT CC V OUT Time Load Transient UGATE 2.2V OUT C = 3000µ ...
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... RT9202 Bootstrap Wave Form V CC UGATE LGATE PHASE Time Reference vs. Temperature 0.803 0.802 0.801 0.800 0.799 0.798 0.797 0.796 - Temperature ( C) POR (Rising/Falling) vs. Temperature 4.3 4.2 Rising 4.1 4.0 3.9 3.8 Falling 3.7 3.6 - Temperature ( C) www.richtek.com 2.2V OUT 100 150 ° 100 150 ° ...
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... LGATE RT9202 Fig.1 Single 5V power Supply Operation Dual Power Operation The RT9202 was designed to regulate a 6.0V at VCC pin automatically when BOOT pin is powered by 12V system with ATX 5V/12V power supply, the RT9202 is ideal for higher current application due to the higher gate driving capability 6.0V (10Ω ...
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... Only 3 times of trigger are allowed to latch off. Hiccup is disabled during soft-start interval. www.richtek.com 10 and a small IN tracking the OCSET DS(ON) Shutdown Pulling low the OCSET pin by a small single transistor can shutdown the RT9202 PWM controller as shown in typical application circuit. + (∆I)/ + OCSET V i SET+ ...
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... Applications Information Inductor Selection The RT9202 was designed for V application mainly. Fig.5 shows the typical topology and waveforms of step-down converter. The ripple current of inductor can be calculated as follows: )/L × ( RIPPLE OUT Because operation frequency is fixed at 300kHz, = 3.33 × /5V ON OUT ...
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... LC filter pole Error Amp pole P = 300kHz A 1 × π × ESR × C ESR zero The RT9202 Bode plot as shown Fig.6 is stable in most of application conditions 3.3V OUT C = 1500µF(33mΩ) OUT L=2µ 2.9kHz V = 1.5V O OUT ...
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... PCB traces help in minimizing the magnitude of voltage spikes. There are two sets of critical components in a DC-DC converter using the RT9202. The switching power components are most critical because they switch large amounts of energy, and as such, they tend to generate equally large amounts of noise. The critical ...
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... RT9202 Package Information J B Symbol www.richtek.com Dimensions In Millimeters Min Max 4.801 5.004 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.178 0.254 0.102 0.254 5.791 6.198 0.406 1.270 H M Dimensions In Inches Min Max 0.189 ...
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... DS9202-02 August 2002 RT9202 www.richtek.com 15 ...
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... RT9202 RICHTEK TECHNOLOGY CORP. Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 www.richtek.com 16 RICHTEK TECHNOLOGY CORP. Taipei Office (Marketing) 8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com DS9202-02 August 2002 ...