RT8223MZQW

RT8223L RICHTEK | Alldatasheet

Document overview

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Technical content

Features

zzzzz Constant On-time Control with 100ns Load Step Response zzzzz Wide Input Voltage Range : 6V to 25V zzzzz Dual Adjustable Outputs from 2V to 5.5V zzzzz Fixed 3.3V and 5V LDO Output : 100mA zzzzz 2V Reference Voltage zzzzz Frequency Selectable via TONSEL Setting zzzzz 4700ppm/°°°°°C RDS(ON) Current Sensing zzzzz Programmable Current Limit Combined with Enable Control zzzzz Selectable PWM, DEM, or Ultrasonic Mode zzzzz Internal Soft-Start and Soft-Discharge zzzzz High Efficiency up to 97% zzzzz 5mW Quiescent Power Dissipation zzzzz Thermal Shutdown zzzzz RoHS Compliant and Halogen Free

Applications

z Notebook and Sub-Notebook Computers z 3-Cell and 4-Cell Li+ Battery-Powered Devices Package Type QW : WQFN-24L 4x4 (W-Type) Lead Plating System G : Green (Halogen Free and Pb Free) Z : ECO (Ecological Element with Halogen Free and Pb free) RT8223 Pin Function L : Default M : With ENC

DS8223L/M-04 April 2011www.richtek.com Pin Configurations WQFN-24L 4x4 RT8223L (TOP VIEW) WQFN-24L 4x4 RT8223M ENTRIP1 FB1 REF TONSEL FB2 ENTRIP2 LGATE2 VOUT2 VREG3 BOOT2 PHASE2 UGATE2 NC VREG5 GND SKIPSEL EN VIN UGATE1 LGATE1 VOUT1 PGOOD BOOT1 PHASE1 GND 789 1 0 1 2 11 21 20 1924 2223 ENTRIP1 FB1 REF TONSEL FB2 ENTRIP2 LGATE2 VOUT2 VREG3 BOOT2 PHASE2 UGATE2 ENC VREG5 GND SKIPSEL EN VIN UGATE1 LGATE1 VOUT1 PGOOD BOOT1 PHASE1 GND 789 1 0 1 2 11 21 20 1924 2223 Marking Information EP= : Product Code YMDNN : Date Code RT8223LGQW RT8223MGQW EQ= : Product Code YMDNN : Date Code RT8223MZQW EQ : Product Code YMDNN : Date CodeEP YM DNN EP=YM DNN EQ=YM DNN EQ YM DNN RT8223LZQW EP : Product Code YMDNN : Date Code

DS8223L/M-04 April 2011 www.richtek.com Typical Application Circuit RT8223L PHASE1 LGATE1 BOOT1 UGATE1 VOUT1 VOUT1 VIN VREG5 VREG3 PGOOD GND 25 (Exposed Pad) PHASE2 LGATE2 BOOT2 UGATE2 VOUT2 VOUT2 L2C11 C17 3.3V R10 C12 VIN 10µF 10µF 0.1µF R11 C14 BSC119 N03S BSC119 N03S RBOOT2 C13 4.7µH 220µF L1 C2 10µF 0.1µF BSC119 N03S BSC119 N03S RBOOT1 0 6.8µH 220µF 3.9 C10 0.1µF 5V Always On 3.3V Always On ENTRIP1 ENTRIP2 FB2 FB12 RILIM1 150k 150k 4.7µF R6 100k PGOOD Indicator C16 4.7µF REF3 C15 0.22µF TONSEL SKIPSEL Frequency Control PWM/DEM/Ultrasonic ENON OFF R14 6.5k R15 10k C21 C20 0.1µF R12 15k R13 10k C18 C19 0.1µF GND 15 6V to 25V VREF RILIM2 VOUT1 0.1µF RT8223M PHASE1 LGATE1 BOOT1 UGATE1 VOUT1 VIN VREG5 VREG3 PGOOD GND 25 (Exposed Pad) PHASE2 LGATE2 BOOT2 UGATE2 VOUT2 VOUT2 L2C11 C17 3.3V R10 C12 VIN 10µF 10µF 0.1µF R11 C14 BSC119 N03S BSC119 N03S C13 4.7µH 220µF L1 C2 10µF 0.1µF BSC119 N03S BSC119 N03S RBOOT1 6.8µH 220µF 3.9 C10 0.1µF 5V Always On 3.3V Always On ENTRIP1 ENTRIP2 FB2 FB12 150k 150k 4.7µF R6 100k PGOOD Indicator C16 4.7µF REF3 C15 0.22µF TONSEL SKIPSEL Frequency Control PWM/DEM/Ultrasonic ENON OFF R14 6.5k R15 10k C21 C20 R12 15k R13 10k C18 C19 0.1µF GND 15 6V to 25V VREF ENC18ON OFF RBOOT2 RILIM1 RILIM2

DS8223L/M-04 April 2011www.richtek.com Functional Pin Description Pin No. Pin Name Pin Function

1 ENTRIP1

Channel 1 Enable and Current Limit Setting Input. Connect a resistor to GND to set the threshold for channel 1 synchronous RDS(ON) sense. The GND − PHASE1 current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.515V to 3V range. There is an internal 10μA current source from VREG5 to ENTRIP1. Leave ENTRIP1 floating or drive it above 4.5V to shut down channel 1. 2 FB1 SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from VOUT1 to GND to adjust output from 2V to 5.5V.

3 REF

2V Reference Output. Bypass to GND with a minimum 0.22μF capacitor. REF can source up to 100 μA for external loads. Loading REF degrades FBx and output accuracy according to the REF load-regulation error.

4 TONSEL

Frequency Selectable Input for VOUT1/VOUT2 respectively. 400kHz/500kHz : Connect to VREG5 or VREG3 300kHz/375kHz : Connect to REF 200kHz/250kHz : Connect to GND 5 FB2 SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from VOUT2 to GND to adjust output voltage from 2V to 5.5V.

6 ENTRIP2

Channel 2 Enable and Current Limit Setting Input. Connect a resistor to GND to set the threshold for channel 2 synchronous RDS(ON) sense. The GND − PHASE2 current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.515V to 3V range. There is an internal 10μA current source from VREG5 to ENTRIP2. Leave ENTRIP1 floating or drive it above 4.5V to shut down channel 2. 7 VOUT2 Bypass Pin for SMPS2. Connect to the SMPS2 output to bypass efficient power for VREG3 pin. VOUT2 is also for the SMPS2 output soft-discharge. 8 VREG3 3.3V Linear Regulator Output. 9 BOOT2 Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor according to the typical application circuits. 10 UGATE2 Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and BOOT2.

11 PHASE2

Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2 high side gate driver. PHASE2 is also the current-sense input for the SMPS2. 12 LGATE2 Lower Gate Driver Output for SMPS2. LGATE2 swings between GND and VREG5. 13 EN Master Enable Input. The REF/VREG5/VREG3 are enabled if it is within logic high level and disabled if it is less than the logic low level.

14 SKIPSEL

Operation Mode Selectable Input. Connect to VREG5 or VREG3 : Ultrasonic Mode Connect to REF : PWM Mode Connect to GND : DEM Mode 16 VIN Supply Input for 5V/3.3V LDO and Feed Forward On-Time circuitry. 17 VREG5 5V Linear Regulator Output. VREG5 is also the supply voltage for the lower gate driver and analog supply voltage for the device. NC (RT8223L) No Internal Connection.

18 ENC

(RT8223M) SMPS Enable Input. Pull up to VREG3 or VREG5 to turn on both switch channels. Short to GND to shutdown them. 19 LGATE1 Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and VREG5. To be continued

DS8223L/M-04 April 2011 www.richtek.com Pin No. Pin Name Pin Function

20 PHASE1

Switch Node for SMPS1. PHASE1 is the internal lower supply rail for the UGATE1 high side gate driver. PHASE1 is also the current-sense input for the SMPS1. 21 UGATE1 Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and BOOT1. 22 BOOT1 Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor according to the typical application circuits. 23 PGOOD Power Good Output for Channel 1 and Channel 2. (Logical AND). 24 VOUT1 Bypass Pin for SMPS1. Connect to the SMPS1 output to bypass efficient power for VREG5 pin. VOUT1 is also for the SMPS1 output soft-discharge. 15,25 (Exposed Pad) GND Ground for SMPS Controller. The exposed pad must be soldered to a large PCB and connected to GND for maximum power dissipation. Function Block Diagram SMPS2 PWM Buck Controller BOOT2 UGATE2 PHASE2 LGATE2 GND VREG5 VOUT2 FB2 ENTRIP2 PGOOD SMPS1 PWM Buck Controller BOOT1 UGATE1 PHASE1 LGATE1 VREG5 VOUT1 FB1 ENTRIP1 VREG5 Thermal Shutdown REF SW5 Threshold TONSEL SKIPSEL VIN VREG5 Power-On Sequence Clear Fault Latch EN VREG3 SW3 Threshold REF VREG3 ENC VREG5 10µA VREG5 10µA

DS8223L/M-04 April 2011www.richtek.com Recommended Operating Conditions (Note 4) Absolute Maximum Ratings (Note 1) z PHASEx to GND z UGATEx to PHASEx z LGATEx to GND z Power Dissipation, PD @ TA = 25°C z Package Thermal Resistance (Note 2) z ESD Susceptibility (Note 3)

DS8223L/M-04 April 2011 www.richtek.com

Electrical Characteristics

(VIN = 12V, VEN = VENC = 5V, VENTRIP1 = VENTRIP2 = 2V, No Load, TA = 25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Input Supply VIN Standby Current I VIN_SBY V IN = 6V to 25V, ENTRIPx = GND -- 200 -- μA VIN Shutdown Supply Current IVIN_SHDN VIN = 6V to 25V, ENTRIPx = EN = GND -- 20 40 μA Quiescent Power Consumption PVIN +PPVCC Both SMPS On, VFBx = 2.1V, SKIPSEL = GND, VOUT1 = 5V, VOUT2 = 3.3V (Note 5) -- 5 7 mW SMPS Output and FB Voltage FBx Voltage V FBx DEM Mode 1.975 2 2.025 V PWM Mode (Note 6) -- 2 -- Ultrasonic Mode -- 2.032 -- Output Voltage Adjust Range VOU Tx SMPS1, SMPS2 2 -- 5.5 V VOUTx Discharge Current V OUTx = 0.5V, VENTRIPx = 0V 10 45 -- mA On-Time On-Time Pulse Width t ON TONSEL = GND VOUT1 = 5.05V (200kHz) 1895 2105 2315 ns VOUT2 = 3.33V (250kHz) 999 11 10 1221 TONSEL = REF VOUT1 = 5.05V (300kHz) 1227 1403 1579 VOUT2 = 3.33V (375kHz) 647 740 833 TONSEL = VREG5 VOUT1 = 5.05V (400kHz) 895 1052 1209 VOUT2 = 3.33V (500kHz) 475 555 635 Minimum Off-Time t OFF V FBx = 1.9V 200 300 400 ns Ultrasonic Mode Frequency SKIPSEL = VREG5 or VREG3 22 33 -- kHz Soft-Start Soft-Start Time t SSx Internal Soft-Start -- 2 -- ms Current Sense ENTRIPx Source Current IENTRIPx V ENTRIPx = 0.9V 9.4 10 10.6 μA ENTRIPx Current Temperature Coefficient TCIENTRIPx In Comparison with 25°C (Note 6) -- 4700 -- ppm/°C ENTRIPx Adjustment Range V ENTRIPx = IENTRIPx x RENTRIPx -- -- 3 V Current Limit Threshold GND − PHASEx, VENTRIPx = 2V 180 200 220 mV Zero-Current Threshold GND − PHASEx in DEM -- 3 -- mV

DS8223L/M-04 April 2011www.richtek.com To be continued Parameter Symbol Test Conditions Min Typ Max Unit Internal Regulator and Reference VOUT1 = GND, IVREG5 < 100mA 4.8 5 5.2 VOUT1 = GND, 6.5V < VIN < 25V , IVREG5 < 100mA 4.75 5 5.25 VREG5 Output Voltage V VREG5 VOUT1 = GND, 5.5V < VIN < 25V , IVREG5 < 50mA 4.75 5 5.25 V VOUT2 = GND, IVREG3 < 100mA 3.2 3.33 3.46 VOUT2 = GND, 6.5V < VIN < 25V , IVREG3 < 100mA 3.13 3.33 3.5 VREG3 Output Voltage V VREG3 VOUT2 = GND, 5.5V < VIN < 25V , IVREG3 < 50mA 3.13 3.33 3.5 V VREG5 Output Current I VREG5 V VR EG5 = 4.5V, VOUT1 = GND 100 175 250 mA VREG3 Output Current I VREG3 V VR EG3 = 3V, VOUT2 = GND 100 175 250 mA VOUT1 Rising Edge 4.6 4.75 4.9 V VREG5 Switch-over Threshold to VOUT1 VSW5 VOUT1 Falling Edge 4.3 4.4 4.5 V VOUT2 Rising Edge 2.975 3.125 3.25 V VREG3 Switch-over Threshold to VOUT2 VSW3 VOUT2 Falling Edge 2.775 2.875 2.975 V VREGx Switch-over Equivalent Resistance RSWx VREGx to V OUTx, 10mA -- 1.5 3 Ω REF Output Voltage V REF No External Load 1.98 2 2.02 V REF Load Regulation 0 < I LOAD < 100μA -- 10 -- mV REF Sink Current REF in Regulation 5 -- -- μA UVLO Rising Edge -- 4.2 4.45 VREG5 Under Voltage Lockout Threshold Falling Edge 3.7 3.9 4.1 V VREG3 Under Voltage Lockout Threshold SMPSx off -- 2.5 -- V Power Good PGOOD Detect, FBx falling Edge 82 85 88 PGOOD Threshold Hysteresis, Rising Edge with SS Delay Time -- 6 -- PGOOD Propagation Delay Falling Edge, 50mV Overdrive -- 10 -- μs PGOOD Leakage Current High State, Forced to 5.5V -- -- 1 μA PGOOD Output Low Voltage I SINK = 4mA -- -- 0.3 V Fault Detection Over Voltage Protection Trip Threshold VFB_OVP OVP Detect, FBx Rising Edge 109 112 116 % Over Voltage Protection Propagation Delay FBx = 2.35V -- 5 -- μs Under Voltage Protection Trip Threshold VFB_UVP UVP Detect, FBx Falling Edge 49 52 56 %

DS8223L/M-04 April 2011 www.richtek.com Parameter Symbol Test Conditions Min Typ Max Unit UVP Shutdown Blanking Time t SHDN_UVP From ENTRIPx Enable -- 5 -- ms Thermal Shutdown Thermal Shutdown T SHDN -- 150 -- °C Thermal Shutdown Hysteresis -- 10 -- °C Logic Input Low Level (DEM Mode) -- -- 0.8 REF Level (PWM Mode) 1.8 -- 2.3 SKIP SEL Input Voltage High Level (Ultrasonic Mode) 2.7 -- -- V On Level (SMPS On) -- -- 3 ENTRIPx Input Voltage V ENTRIPx High Level (SMPS Off) 4.5 -- -- V Logic-High V IH 2.4 -- -- EN Threshold Voltage Logic-Low V IL -- -- 0.4 V EN Voltage V EN Floating, Default Enable 2.4 3.3 4.2 V VEN = 0.2V, Source 1.5 3 5 EN Current I EN VEN = 5V, Sink -- 3 8 μA Logic-High V IH_ENC 2 -- -- ENC Threshold Voltage (RT8223M) Logic-Low V IL_ENC -- -- 0.6 V VOUT1 / VOUT2 = 200kHz/250kHz -- -- 0.8 VOUT1 / VOUT2 = 300kHz/375kHz 1.8 -- 2.3 TONSEL Setting Voltage VOUT1 / VOUT2 = 400kHz/500kHz 2.7 -- -- V VTONSEL, VSKIPSEL = 0V or 5V −1 -- 1 Input Leakage Current VEN C = 0V or 5V −1 -- 1 μA Internal BOOT Switch Internal Boost Switch On-Resistance VREG5 to BOOTx, 10mA -- 40 80 Ω Power MOSFET Drivers UGATEx, High State, BOOTx to PHASEx Forced to 5V -- 4 8 UGATEx On-Resistance UGATEx, Low State, BOOTx to PHASEx Forced to 5V -- 1.5 4 Ω LGATEx, High State -- 4 8 LGATEx On-Resistance LGATEx, Low State -- 1.5 4 Ω LGATEx Rising -- 30 -- Dead Time UGATEx Rising -- 40 -- ns

DS8223L/M-04 April 2011www.richtek.com Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. θ JA is measured in natural convection at T A = 25 °C on a high effective thermal conductivity four-layer test board of JEDEC 51-7 thermal measurement standard. The measurement case position of θJC is on the exposed pad of the package. Note 3. Devices are ESD sensitive. Handling precaution is recommended. Note 4. The device is not guaranteed to function outside its operating conditions. Note 5. PVIN + PVREG5 Note 6. Guaranteed by Design.

DS8223L/M-04 April 2011 www.richtek.com Typical Operating Characteristics VOUT1 Efficiency vs. Load Current 100 0.001 0.01 0.1 1 10 Load Current (A) Efficiency (%) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 20V TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VOUT2 Efficiency vs. Load Current 100 0.001 0.01 0.1 1 10 Load Current (A) Efficiency (%) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 12V TONSEL = GND, EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V VOUT2 Efficiency vs. Load Current 100 0.001 0.01 0.1 1 10 Load Current (A) Efficiency (%) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 20V TONSEL = GND,EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V VOUT1 Efficiency vs. Load Current 100 0.001 0.01 0.1 1 10 Load Current (A) Efficiency (%) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 8V, TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VOUT1 Efficiency vs. Load Current 100 0.001 0.01 0.1 1 10 Load Current (A) Efficiency (%) 1 DEM Mode Ultrasonic Mode PWM Mode TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VIN = 12V VOUT2 Efficiency vs. Load Current 100 0.001 0.01 0.1 1 10 Load Current (A) Efficiency (%) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 8V TONSEL = GND, EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V

DS8223L/M-04 April 2011www.richtek.com VOUT1 Switching Frequency vs. Load Current 100 120 140 160 180 200 220 0.001 0.01 0.1 1 10 Load Current (A) Switching Frequency (kHz) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 8V TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VOUT1 Switching Frequency vs. Load Current 100 120 140 160 180 200 220 0.001 0.01 0.1 1 10 Load Current (A) Switching Frequency (kHz) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 12V TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VOUT1 Switching Frequency vs. Load Current 100 120 140 160 180 200 220 0.001 0.01 0.1 1 10 Load Current (A) Switching Frequency (kHz) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 20V TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VOUT2 Switching Frequency vs. Load Current 100 120 140 160 180 200 220 240 260 280 0.001 0.01 0.1 1 10 Load Current (A) Switching Frequency (kHz) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 8V TONSEL = GND, EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V VOUT2 Switching Frequency vs. Load Current 100 120 140 160 180 200 220 240 260 280 0.001 0.01 0.1 1 10 Load Current (A) Switching Frequency (kHz) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 12V TONSEL = GND, EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V VOUT2 Switching Frequency vs. Load Current 100 120 140 160 180 200 220 240 260 280 0.001 0.01 0.1 1 10 Load Current (A) Switching Frequency (kHz) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 20V TONSEL = GND, EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V

DS8223L/M-04 April 2011 www.richtek.com Battery Current vs. Input Voltage 0.1 1.0 10.0 100.0 6 7 8 9 10 11 12 13 14 1516 17 18 19 20 2122 23 24 25 Input Voltage (V) Battery Current (mA) 1 DEM Mode Ultrasonic Mode PWM Mode TONSEL = GND, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 0.91V No Load Reference Voltage vs. Output Current 2.0000 2.0008 2.0016 2.0024 2.0032 2.0040 2.0048 2.0056 2.0064 2.0072 2.0080 -10 0 10 20 30 40 50 60 70 80 90 100 Output Current (µA) Reference Voltage (V) 1 VIN = 12V, TONSEL = GND, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 5V VREG3 Output Voltage vs. Output Current 3.330 3.334 3.338 3.342 3.346 3.350 3.354 3.358 0 1 02 03 04 05 06 07 0 Output Current (mA) Output Voltage (V) 1 VIN = 12V, TONSEL = GND, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 5V VREG5 Output Voltage vs. Output Current 4.970 4.976 4.982 4.988 4.994 5.000 5.006 0 2 04 06 08 0 1 0 0 Output Current (mA) Output Voltage (V) 1 VIN = 12V, TONSEL = GND, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 5V VOUT1 Output Voltage vs. Load Current 5.000 5.006 5.012 5.018 5.024 5.030 5.036 5.042 5.048 5.054 5.060 5.066 5.072 5.078 5.084 5.090 0.001 0.01 0.1 1 10 Load Current (A) Output Voltage (V) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 12V, TONSEL = GND, EN = FLOATING, VENTRIP1 = 1.5V, V ENTRIP2 = 5V VOUT2 Output Voltage vs. Load Current 3.380 3.386 3.392 3.398 3.404 3.410 3.416 3.422 3.428 3.434 3.440 3.446 0.001 0.01 0.1 1 10 Load Current (A) Output Voltage (V) 1 DEM Mode Ultrasonic Mode PWM Mode VIN = 12V, TONSEL = GND, EN = FLOATING, VENTRIP1 = 5V, V ENTRIP2 = 1.5V

DS8223L/M-04 April 2011www.richtek.com Reference Voltage vs. Temperature 1.984 1.987 1.990 1.993 1.996 1.999 2.002 2.005 2.008 2.011 -50 -25 0 25 50 75 100 125 Temperature (°C) Reference Voltage (V) 1 VIN = 12V, VENTRIP1 = V ENTRIP2 = 5V, EN = FLOATING, TONSEL = GND Time (400 μs/Div) REF (2V/Div) EN (2V/Div) EN = FLOATING, VENTRIP1 = VENTRIP2 = 5V VREG5, VREG3 and REF Start Up No Load, VIN = 12V, TONSEL = GND, VREG5 (5V/Div) VREG3 (2V/Div) Standby Input Current vs. Input Voltage 240 241 242 243 244 245 246 247 248 249 250 7 8 9 1 01 11 21 31 41 51 61 71 81 92 02 12 22 32 4 Input Voltage (V) Standby Input Current (µA) 1 No Load, EN = FLOATING, VENTRIP1 = VENTRIP2 = 5V Shutdown Input Current vs. Input Voltage 7 8 9 1 01 11 21 31 41 51 61 71 81 92 02 12 22 32 4 Input Voltage (V) Shutdown Input Current (µA) 1 No Load, EN = GND, VENTRIP1 = VENTRIP2 = 5V Power On From ENC (8223M) Time (1ms/Div) ENC (5V/Div) VOUT1 (5V/Div) PGOOD (5V/Div) No Load VIN = 12V, TONSEL = GND, SKIPSEL = REF, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 1.5V, VENC = 5V VOUT2 (2V/Div) Power Off From ENC (8223M) Time (4ms/Div) No Load ENC (5V/Div) VOUT1 (5V/Div) PGOOD (5V/Div) VOUT2 (2V/Div) VIN = 12V, TONSEL = GND, SKIPSEL = REF, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 1.5V, VENC = 5V

DS8223L/M-04 April 2011 www.richtek.com VOUT1 PWM Mode Load Transient Response Time (20 μs/Div) UGATE1 (20V/Div) VOUT1_AC (50mV/Div) LGATE1 (5V/Div) VIN = 12V, TONSEL = GND, Inductor Current (5A/Div) EN = FLOATING, SKIPSEL = REF, IOUT1 = 0A to 6A VOUT2 PWM Mode Load Transient Response Time (20 μs/Div) VOUT2_AC (50mV/Div) LGATE2 (5V/Div) Inductor Current (5A/Div) EN = FLOATING, SKIPSEL = REF, IOUT2 = 0A to 6A VIN = 12V, TONSEL = GND, UGATE2 (20V/Div) Power Off from ENTRIP2 Time (2ms/Div) No Load VIN = 12V, TONSEL = GND, SKIPSEL = REF, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 1.5V ENTRIP2 (5V/Div) VOUT2 (2V/Div) PGOOD (5V/Div) Power On from ENTRIP1 Time (1ms/Div) ENTRIP1 (5V/Div) VOUT1 (2V/Div) VIN = 12V, TONSEL = GND, SKIPSEL = REF, EN = FLOATING, No Load VENTRIP1 = V ENTRIP2 = 1.5V PGOOD (5V/Div) Time (2ms/Div) Power Off from ENTRIP1 No Load VIN = 12V, TONSEL = GND, SKIPSEL = REF, EN = FLOATING, VENTRIP1 = V ENTRIP2 = 1.5V ENTRIP1 (5V/Div) VOUT1 (2V/Div) PGOOD (5V/Div) Power On from ENTRIP2 Time (1ms/Div) ENTRIP2 (5V/Div) VOUT2 (2V/Div) VIN = 12V, TONSEL = GND, SKIPSEL = REF, EN = FLOATING, No Load VENTRIP1 = V ENTRIP2 = 1.5V PGOOD (5V/Div)

DS8223L/M-04 April 2011www.richtek.com OVP Time (4ms/Div) PGOOD (5V/Div) VOUT1 (2V/Div) No Load, VIN = 12V, TONSEL = GND, EN = FLOATING, SKIPSEL = GND VOUT2 (2V/Div) UVP Time (100 μs/Div) VOUT1 (5V/Div) VIN = 12V, TONSEL = GND, UGATE1 (20V/Div) LGATE1 (5V/Div) PGOOD (5V/Div) EN = FLOATING, SKIPSEL = REF

DS8223L/M-04 April 2011 www.richtek.com

Application Information

The RT8223L/M is a dual, Mach ResponseTM DRVTM dual ramp valley mode synchronous buck controller. The controller is designed for low voltage power supplies for notebook computers. Richtek's Mach Response TM technology is specifically designed for providing 100ns “instant-on” response to load steps while maintaining a relatively constant operating frequency and inductor operating point over a wide range of input voltages. The topology circumvents the poor load-transient timing problems of fixed-frequency current mode PWMs while avoiding the problems caused by widely varying switching frequencies in conventional constant on-time and constant off-time PWM schemes. The DRV TM mode PWM modulator is specifically designed to have better noise immunity for such a dual output application. The RT8223L/M includes 5V (VREG5) and 3.3V (VREG3) linear regulators. VREG5 linear regulator can step down the battery voltage to supply both internal circuitry and gate drivers. The synchronous-switch gate drivers are directly powered from VREG5. When VOUT1 voltage is above 4.75V, an automatic circuit will switch the power of the device from VREG5 linear regulator to VOUT1. PWM Operation The Mach Response TM DRVTM mode controller relies on the output filter capacitor's effective series resistance (ESR) to act as a current sense resistor, so the output ripple voltage provides the PWM ramp signal. Refer to the RT8223L/M's function block diagram, the synchronous high side MOSFET will be turned on at the beginning of each cycle. After the internal one-shot timer expires, the MOSFET will be turned off. The pulse width of this one shot is determined by the converter's input voltage and the output voltage to keep the frequency fairly constant over the input voltage range. Another one shot sets a minimum off-time (300ns typ.). The on-time one shot will be triggered if the error comparator is high, the low side switch current is below the current limit threshold, and the minimum off-time one shot has timed out. PWM Frequency and On-Time Control The Mach Response TM control architecture runs with pseudo constant frequency by feed-forwarding the input /ON OUT INt= K ( V V )× where “K”is set by the TONSEL pin connection (Table 1). The on-time guaranteed in the Electrical Characteristics table is influenced by switching delays in the external high side power MOSFET. Two external factors that influence switching frequency accuracy are resistive drops in the two conduction loops (including inductor and PC board resistance) and the dead time effect. These effects are the largest contributors to the change in frequency with changing load current. The dead-time effect increases the effective on-time by reducing the switching frequency . It occurs only in PWM mode (SKIPSEL= REF) when the inductor current reverses at light or negative load currents. With reversed inductor current, the inductor EMF causes PHASEx to go high earlier than normal, thus extending the on-time by a period equal to the low-to- high dead time. For loads above the critical conduction point, the actual switching frequency is : OUT DROP1 ON IN DROP1 DROP2f = (V V ) (t (V V V ))+× + − where VDROP1 is the sum of the parasitic voltage drops in the inductor discharge path,which includes the synchronous rectifier, inductor, and PC board resistances. V DROP2 is the sum of the resistances in the charging path, and tON is the on-time. and output voltage into the on-time one-shot timer. The high side switch on-time is inversely proportional to the input voltage as measured by V IN, and proportional to the output voltage. There are two benefits of a constant switching frequency. First, the frequency can be selected to avoid noise-sensitive regions such as the 455kHz IF band. Second, the inductor ripple current operating point remains relatively constant, resulting in easy design methodology and predictable output voltage ripple. Frequency for the 3V SMPS is set at 1.25 times higher than the frequency for 5V SMPS. This is done to prevent audio-frequency “Beating” between the two sides, which switch asynchronously for each side. The frequencies are set by the TONSEL pin connection as shown in Table 1. The on-time is given by :

Table 1. TONSEL Connection and Switching Frequency Mode. User can set operation mode via the SKIPSEL pin. Figure 1. Boundary Condition of CCM/DEM (especially at low input-voltage levels). current dropped has below the zero-crossing threshold.

simultaneously shutting down the VREG5 linear regulator. The RT8223L/M has a cycle-by-cycle current-limit control. PWM is not allowed to initiate a new cycle (Figure 2). threshold by an amount equal to the inductor ripple current. resistance, inductor value, and battery and output voltage. Figure 2. “Valley” Current-Limit a 5V bias voltage is delivered from the VREG5 supply.

input capacitor connected between VREG5 and GND. efficiency killing, EMI-producing shoot-through currents. MOSFET without degrading the turn-off time (Figure 3). Figure 3. Reducing the UGATEx Rise Time is designed specifically for FBx floating. voltages are above 91% of the nominal regulation point. below its nominal regulator point. the output capacitor and pulls the input voltage downward. circuit to prevent false alarm. diode across the output to act as a reverse polarity clamp. the battery from the output.

may also result in thermal shutdown. latch is set, the output discharge mode will be triggered. Table 2. Operation Mode Truth Table LGATEx is forced high. VREG3, VREG5 and REF active. discharge mode. VREG3, VREG5 and REF are active. discharge to GND through an internal switch. =high. VREG3, VREG5 and REF are active. Shutdown EN =low All circuitry off. to place the RT8223L/M in its low power shutdown state. providing sufficient hysteresis for most applications.

Table 3. Power Up Sequencing Figure 4. Setting VOUTX with a Resistor Voltage Divider the average inductor current. The calculation above shall serve as a general reference. considered along with the selection of the output capacitor.

minimum off-time, and K is a factor listed in Table 1. Figure 5. Derating Curve for the RT8223L/M Package a layout using the RT8223L/M. to high voltage switching nodes. 0.65mm (25mils) or wider trace. inductor, should be as short and wide as possible.

DS8223L/M-04 April 2011www.richtek.com Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property inf ringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications i s assumed by Richtek. Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Richtek Technology Corporation Taipei Office (Marketing) 5F, No. 95, Minchiuan Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)86672399 Fax: (8862)86672377 Email: marketing@richtek.com Outline Dimension A D E L be SEE DETAIL A Dimensions In Millimeters Dimensions In Inches Symbol 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 0.180 0.300 0.007 0.012 D 3.950 4.050 0.156 0.159 D2 2.300 2.750 0.091 0.108 E 3.950 4.050 0.156 0.159 E2 2.300 2.750 0.091 0.108 e 0.500 0.020 L 0.350 0.450 0.014 0.018 W-Type 24L QFN 4x4 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 2 2