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RT8238A

15

RT8238A-07   January  2014

www.richtek.com

Richtek Technology Corporation

14F, No. 8, Tai Yuen 1

st

 Street, Chupei City

Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789

Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.

Outline Dimension

Symbol 

Dimensions In Millimeters 

Dimensions In Inches 

Min Max Min Max 

A 0.700 0.800 0.028 0.031 

A1 0.000 0.050 0.000 0.002 

A3 0.175 0.250 0.007 0.010 

b 0.150 0.250 

0.006 

0.010 

D 1.900 2.100 0.075 0.083 

E 1.900 2.100 0.075 0.083 

e 0.400 

0.016 

D2 0.850 0.950 0.033 0.037 

E2 0.850 0.950 0.033 0.037 

L 0.250 0.350 

0.010 0.014 

 

W-Type 12L QFN 2x2 Package

Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.

DETAIL A

Pin #1 ID and Tie Bar Mark Options

1

1

2

2

Содержание RT8238A

Страница 1: ... excellent transient response and highDC output accuracy needed for stepping down high voltage batteries to generate low voltage CPU core I O and chipset RAM supplies in notebook computers The constant on time PWM control scheme handles wide input output voltage ratios with ease and provides 100ns instant on response to load transients while maintaining a relatively constant switching frequency Th...

Страница 2: ... the low side driver and the bootstrap circuit for high side driver Bypass to GND with a 1μF ceramic capacitor 6 FB VOUT Feedback Input Connect FB to a resistive voltage divider from VOUT to GND to adjust the output from 0 5V to 3 3V 7 MODE Pull down to GND for Forced CCM Mode Pull up to 2 5V for Audio Skipping Mode ASM Pull up to 5V for Diode Emulation Mode DEM 8 EN PWM Chip Enable Pull low to GN...

Страница 3: ...GATE PHASE PGOOD GND LGATE TON BOOT TRIG EN R Q S X 1 10 PWM MODE 90 VREF SS Timer POR CS VCC PHASE 10µA Pin No Pin Name Pin Function 9 PGOOD Open Drain Power Good Indicator High impedance indicates power is good 10 CS Current Limit Threshold Setting Input Connect a setting resistor to GND and the current limit threshold is equal to 1 10 of the voltage at this pin 11 TON On time Setting Connect a ...

Страница 4: ...85 C Absolute Maximum Ratings Note 1 z VCC FB PGOOD EN CS MODE to GND 0 3V to 6V z TONtoGND 0 3V to 32V z BOOT to PHASE 0 3V to 6V z PHASE to GND DC 0 3V to 32V 20ns 8V to 38V z UGATE to PHASE DC 0 3V to 6V 20ns 5V to 7 5V z LGATE toGND DC 0 3V to 6V 20ns 2 5V to 7 5V z Power Dissipation PD TA 25 C WQFN 12L 2x2 0 606W z Package Thermal Resistance Note 2 WQFN 12L 2x2 θJA 165 C W z Lead Temperature ...

Страница 5: ... FB 0 45V 250 400 550 ns Current Sensing Threshold CS Source Current VCS 0 5V to 2V 9 10 11 μA CS Source Current TC On the basis of 25 C 4700 ppm C Zero Crossing Threshold VMODE 1 8V Phase GND 10 5 mV ASM Min Frequency VMODE 2 5V 25 kHz Protection Function Current Limit Threshold GND PHASE VCS 1V 85 100 115 mV UVP Threshold UVP Detect FB Falling Edge 60 70 80 OVP Threshold OVP Detect FB Rising Edg...

Страница 6: ... Fault Propagation Delay Falling edge FB forced below PGOOD trip threshold 2 5 μs Output Low Voltage ISINK 1mA 0 4 V Leakage Current High state forced to 5V 1 μA Note 1 Stresses listed as the above Absolute Maximum Ratings may cause permanent damage to the device These are stress ratings Functional operation of the device at these or any other conditions beyond those indicated in the operational s...

Страница 7: ...ode CCMMode Efficiency vs Load Current 0 10 20 30 40 50 60 70 80 90 100 0 001 0 01 0 1 1 10 Load Current A Efficiency VIN 20V VOUT 1V DEMMode CCMMode Switching Frequency vs Load Current 0 50 100 150 200 250 300 350 400 0 001 0 01 0 1 1 10 Load Current A Switching Frequency kHz 1 VIN 12V VOUT 1V DEMMode CCMMode Switching Frequency vs Input Voltage 0 50 100 150 200 250 300 350 400 450 500 6 8 10 12 ...

Страница 8: ...CMMode OVP Time 200μs Div VOUT 500mV Div VIN 12V VOUT 1V No Load UGATE 20V Div LGATE 5V Div IL 10A Div Time 20μs Div UVP VIN 12V VOUT 1V No Load VOUT 500mV Div UGATE 50V Div LGATE 10V Div VOUT 500mV Div Power On from EN Time 1ms Div CCM Mode VIN 12V VOUT 1V No Load UGATE 20V Div EN 5V Div PGOOD 5V Div Power On from EN Time 1ms Div VOUT 500mV Div DEM Mode VIN 12V VOUT 1V No Load UGATE 20V Div EN 5V...

Страница 9: ...s reserved is a registered trademark of Richtek Technology Corporation Mode Transition CCM to DEM Time 1ms Div MODE 5V Div VIN 12V VOUT 1V No Load VOUT 200mV Div UGATE 20V Div LGATE 5V Div Mode Transition DEM to CCM Time 1ms Div MODE 5V Div VIN 12V VOUT 1V No Load VOUT 200mV Div UGATE 20V Div LGATE 5V Div ...

Страница 10: ...nternal on time capacitor The on time is the time required for the voltage on this capacitor to charge from zero volts to VOUT thereby making the on time of the high side switch directly proportional to the output voltage and inversely proportional to the input voltage The implementation results in a nearly constant switching frequency without the need of a clock generator Mode Selection Operation...

Страница 11: ... threshold Forced CCM Mode The low noise forced CCM mode MODE GND disables the zero crossing comparator which controls the low side switch on time This causes the low side gate drive waveform to become the complement of the high side gate drive waveform This in turn causes the inductor current to reverse at light loads as the PWM loop to maintain a duty ratio VOUT VIN The benefit of forced CCM mod...

Страница 12: ...t voltage PGOOD gets pulled low It is held low until the output voltage returns to within these tolerances once more In soft start PGOOD is actively held low and is allowed to transition high until soft start is over and the output reaches 93 of its set voltage There is a 2 5μs delay built into PGOOD circuitry to prevent false transitions POR UVLO and Soft Start Power On Reset POR occurs when VCC ...

Страница 13: ...t distinct ways including double pulsing and feedback loop instability to identify the unstable operation Double pulsing occurs due to noise on the output or because the ESR is too low that there is not enough voltage ramp in the output voltage signal This fools the error comparator into triggering a new cycle immediately after a 400ns minimum off time period has expired Double pulsing is more ann...

Страница 14: ...ower sections should connect directly to ground plane s using multiple vias as required for current handling including the chip power ground connections Power components should be placed to minimize loops and reduce losses Figure 5 Derating Curves for RT8238APackages 0 00 0 05 0 10 0 15 0 20 0 25 0 30 0 35 0 40 0 45 0 50 0 55 0 60 0 65 0 25 50 75 100 125 Ambient Temperature C Maximum Power Dissipa...

Страница 15: ... accurate and reliable However no responsibility is assumed by Richtek or its subsidiaries for its use nor for any infringements of patents or other rights of third parties which may result from its use No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries Outline Dimension Symbol Dimensions In Millimeters Dimensions In Inches Min Max Mi...

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