rt9214 Richtek Technology Corporation, rt9214 Datasheet
rt9214
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rt9214 Summary of contents
Page 1
... Synchronous Buck PWM DC-DC Controller General Description The RT9214 is a high efficiency synchronous buck PWM controllers that generate logic-supply voltages in PC based systems. These high performance , single output devices include internal soft-start, frequency compensation networks and integrates all of the control, output adjustment, monitoring and protection functions into a single package ...
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... RT9214 Functional Pin Description BOOT (Pin 1) Bootstrap supply pin for the upper gate driver. Connect the bootstrap capacitor between BOOT pin and the PHASE pin. The bootstrap capacitor provides the charge to turn on the upper MOSFET. UGATE (Pin 2) Upper gate driver output. Connect to the gate of high- side power N-Channel MOSFET ...
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... Function Block Diagram Bias & Regulators (3V_Logic & 3VDD_Analog) FB DS9214-02 December 2004 VCC Power On Reference Reset 0.8V REF Soft-Start 0.6V + UV_S & - Fault Logic + Oscillator (300kHz) GND + EN - 0.1V PH_M + 1. 40uA Gate + Control - Logic VCC RT9214 OPS BOOT UGATE PHASE LGATE www.richtek.com 3 ...
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... RT9214 Absolute Maximum Ratings Supply Voltage (V ) ------------------------------------------------------------------------------------- 16V CC BOOT ------------------------------------------------------------------------------------ 16V BOOT PHASE PHASE to GND DC ------------------------------------------------------------------------------------------------------------- −5V to 15V < 200ns ------------------------------------------------------------------------------------------------------ −10V to 30V BOOT to PHASE ------------------------------------------------------------------------------------------ 15V BOOT to GND DC ------------------------------------------------------------------------------------------------------------- −0. < 200ns ------------------------------------------------------------------------------------------------------ −0.3V to 42V UGATE ------------------------------------------------------------------------------------------------------- V LGATE ------------------------------------------------------------------------------------------------------- GND - 0. Input, Output or I/O Voltage ----------------------------------------------------------------------------- GND-0. Power Dissipation 25°C (Note 4) ...
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... 12V, V LGATE CC LGATE T DT ∆ FB Falling FBUVT PHASE 25° low effective thermal conductivity test board of A Min Typ -- 0 300 500 -- 4 300 500 = 3.5 RT9214 Max Units -- Ω Ω 5 100 µ www.richtek.com 5 ...
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... RT9214 Typical Operating Characteristics (V = 2.5V, unless otherwise specified ) OUT Efficiency vs. Output Current 1 0.95 0.9 0.85 0.8 0.75 0.7 0. 12V 0 Output Current (A) Reference Voltage vs. Temperature 0.812 V = 12V 0.81 0.808 0.806 0.804 0.802 0.8 0.798 -40 -25 - Temperature (°C) POR vs. Temperature 4.75 Rising 4.5 4.25 4 Falling 3.75 3.5 -40 -10 20 Temperature www ...
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... I OUT (10V/Div) (2V/Div) (2V/Div) (5V/Div) (10V/Div) UGATE (10V/Div) V OUT (100mV/Div OUT I L (10A/Div) Freq. = 1/20ms 2.5A/us RT9214 Power On (500mV/Div) (2A/Div) (10V/Div) Time (500us/Div) Dead Time (Rising 25A Time (25ns/Div) Transient Response (Rising 12V 15A L = 2.2uH C = 2000uF Time (5us/Div) www ...
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... RT9214 Transient Response (Falling) UGATE (10V/Div) V OUT (100mV/Div 12V 15A to 0A OUT I L Freq. = 1/20ms (10A/Div 2.5A/us Time (25us/Div) www.richtek.com 2.2uH C = 2000uF DS9214-02 December 2004 ...
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... Switching frequency = Equivalent series resistor of output capacitor OUT = 1/2 Δ Figure 2. The related waveforms of output capacitor RT9214 V = OUT V IN (1) . Figure 2 shows C V OUT = L I OUT L ΔI L Δ Δ www.richtek.com 9 ...
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... The input capacitor must be cable of handling this ripple current. Sometime, for higher efficiency the low ESR capacitor is necessarily. PWM Loop Stability RT9214 is a voltage mode buck converter using the high gain error amplifier with transconductance (OTA, Operational Transconductance Amplifier). The transconductance : ...
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... I OCSET R of the lower DS(ON) UGATE (10V/Div) I (10A/Div) L UGATE (10V/Div) I (10A/Div) L − 0.4V MOSFET OCP OPS (200mV/Div 5V 12V 1.5V OUT Time (5µs/Div) OCP V = 12V 12V 1.5V OUT Time (2.5µs/Div) RT9214 , DS(ON) UGATE (10V/Div) I (10A/Div) L OPS (200mV/Div) UGATE (10V/Div) I (10A/Div) L www.richtek.com 11 ...
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... V Figure 6. OCP and VIN_POR actions 3. Shutdown Pulling low the OPS pin by a small single transistor can shutdown the RT9214 PWM controller as shown in typical application circuit. Soft Start A built-in soft-start is used to prevent surge current from power supply input during power on. The soft-start voltage is controlled by an internal digital counter ...
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... COUNT = 4 There are two sets of critical components in a DC-DC converter using the RT9214. 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 small signal components are those connected to sensitive nodes or those supplying critical bypass current ...
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... RT9214 5V/12V GND Figure 9. The connections of the critical components in the converter Below PCB gerber files are our test board for your reference: www.richtek.com 14 IQ1 IL V OUT Q1 IQ2 Q2 VCC GND LGATE RT9214 UGATE FB LOAD DS9214-02 December 2004 ...
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... According to our test experience, you must still notice two items to avoid noise coupling: 1.The ground plane should not be separated. 2.V rail adding the LC filter is recommended. CC DS9214-02 December 2004 RT9214 www.richtek.com 15 ...
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... RT9214 Outline Dimension Symbol 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 Dimensions In Millimeters Min Max 4.801 5.004 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1 ...