rt9232b Richtek Technology Corporation, rt9232b Datasheet
rt9232b
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rt9232b Summary of contents
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... RT9232B provides fast transient response to high current output applications (up to 25A) while minimizing external components suitable for high- performance graphic processors, DDR and VTT power. The RT9232B integrates complete protect functions such as Soft Start, Output Enable, UVLO(under-voltage lockout) and OCP into a small 14-pin package. ...
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... Internal IC Supply (12V Bias) www.richtek.com 2 R4 3.01k D1 1N4148 10 BOOT C3 1nF 2 OCSET UGATE C4 0.1uF 8 PHASE LGATE 11 IPD06N03LA PGND 5 FB RT9232B R9 C11 33pF 1k R8 C13 C12 15k 10nF 10nF R10 562 V IN 3.3V - 12V L1 1uH CE0 + C6 C5 0.1uF 10uF Q1 IPD09N03LA L2 2.2uH R7 CE3 ...
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... Function Block Diagram SS FB Reference COMP Operation Startup RT9232B initializes automatically after receiving both V and V power. Special power-on sequence is not IN necessary. The Power-On Reset (POR) function continually monitors input supply voltages and enable voltage. POR function monitors IC power via VCC pin and external MOSFET power via OCSET pin ...
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... RT9232B To prevent OC form tripping in normal operation, R must be carefully chosen with : 1. Maximum R at highest junction temperature DS(ON) 2. MInimum I from specification table OCSET Δ > L(MAX) OUT(MAX) L Δ inductor ripple current L Under Voltage Protection The under voltage protection function protects the converter from an shorted output by detecting the voltage on FB pin to monitor the output voltage ...
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... 4.5V CC_ON OCSET V = 4.5V OCSET OCSET_ON 4.5V EN_ON OCSET 4.5V EN,_OFF OCSET f OSC 6k < (RT to GND) < 200k ΔV OSC RT9232B +15V CC + 0.3V CC − 65°C to 150°C ± 10% ± 10% − 40°C to 85°C − 40°C to 125°C Min Typ. Max Units -- 8.4 -- 10.4 ...
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... RT9232B Parameter Reference Error Amplifier Reference Voltage Error Amplifier DC gain Gain-Bandwidth product Slew Rate Soft Start External SS Source Current PWM Controller Gate Driver Upper Drive Source Upper Drive Sink Lower Drive Source Lower Drive Sink Driving Capability Upper Drive Source Upper Drive Sink ...
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... V OUT (2V/Div) EN (10V/Div (1A/Div) UGATE (20V/Div) LGATE (10V/Div) V OUT (500mV/Div (10A/Div) RT9232B R vs. Oscillator Frequency RT Pull high Pull down to GND 1 0 100 200 300 400 Frequency (kHz) Power On Time (10ms/Div) Power Off Time (10μs/Div) www.richtek.com ...
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... RT9232B Load Transient Response UGATE (20V/Div) LGATE (10V/Div) V OUT (100mV/Div (10A/Div) Time (25μs/Div) Load Transient Response UGATE (20V/Div) V OUT (500mV/Div) LGATE (10V/Div (20A/Div) Time (1ms/Div) Dead Time Falling UGATE PHASE UGATE−PHASE LGATE (5/Div) Time (25ns/Div) www.richtek.com 8 Load Transient Response ...
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... Temperature (°C) DS9232B-03 March 2007 0.804 0.803 0.802 0.801 0.800 0.799 0.798 0.797 0.796 0.795 0.794 60 80 100 120 140 RT9232B V vs. Temperature REF -40 - Temperature (°C) www.richtek.com 100 120 140 9 ...
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... OCSET pin. An internal current source IN with driving capability of 200uA causes a fixed voltage drop across the resistor connecting V The RT9232B internal logic will deem the input voltage ready once the voltage of OCSET pin is high than 1.5V. The preferred V ready level could be set by selecting an ...
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... Under Voltage Protection The under voltage protection is enabled when the RT9232B is activated and SS voltage is higher than 4V. The UVP function is specified for protecting the converter from an instant output short circuit during normal operation. The RT9232B continuously monitors the output voltage by detecting the voltage on FB pin. The UVP function is ...
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... RT9232B MOSFET Selection The selection of MOSFETs is based upon the considerations gate driving requirements, and DS(ON) thermal management requirements. The power loss of upper MOSFET consists of conduction loss and switching loss and is expressed UPPER COND_UPPER SW_UPPER 1 = × × OUT ...
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... IC, so the ceramic capacitor should be placed adjacent to the IC. to the power MOSFETs. possible and keep away from the inductor and all noise sources. each other and close to MOSFETs. MOSFETs should be as short as possible and can carry 1A peak current. RT9232B www.richtek.com 13 ...
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... RT9232B Outline Dimension J 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 Dimensions In Millimeters Min Max 8.534 8.738 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.178 ...