R2A20101BM/NP Monolithic Synchronous Step-Down DC/DC Converter REJ03D0790-0300 Rev.3.00 May 14, 2008 Features • Built-in low Ron power MOS FETs Pch Ron = 0.30 Ω (Typ), Nch Ron = 0.14 Ω (Typ) • High switching frequency: 2 MHz (Max) • Output current: 650 mA (Max) • Output ON/OFF control • Vout control • Power good monitor • Current share for redundant power supply operation • Vout = 0.5 V to (VIN – 0.5) V Application • POL (Point of Load) power supplies • Power supply for microcomputer systems MCU-Core, I/O, Memory (DDR, SRAM, FLASH, HDD, etc.), FPGA, DSP, Graphic Processor • Battery powered equipment systems Cellular phone (CDMA power amplifier, MCU, DSP, ASIC), PDA, Digital camera, Portable game, Handy terminal Operating Circuit Example Vin 2.5V to 5.5V L1 2.2µH R2A20101 VIN Cin 4.7µF Power Good Signal Output Error Amp. Output (for Current Share) Vref Input (for Vout Control) ON/OFF PGND PWGD CRFB Rcf2 68kΩ Rcf1 100kΩ EAO VFB AGND VREF (Internal Vref = 0.5V) Notes: 1. All ceramic capacitor 2. Rcf1 : Rcf2(recommend) = 3 : 2 3. fsw is adjustable by Ccf1, Rcf1, and Rcf2. REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 1 of 9 Iout: Up to 650mA LX Ccf1 47pF Rvf2 390kΩ Rvf1 150kΩ Vout 1.8V Cout 4.7µF R2A20101BM/NP Block Diagram ON/OFF SHDN Shut Down UVLO VIN PWGD Power Good Comparator Ref 1.15V – + PWM Control Logic Vref × 10% 1.3MΩ + – VREF 1.5kΩ LX SS PGND Error Amplifier EAO CRFB VFB 1MΩ AGND Absolute Maximum Ratings (Ta = 25°C) Item Power supply voltage ON/OFF, PWGD, EAO, VREF, LX, CRFB, VFB terminal voltage PGND terminal voltage Operating ambient temperature Junction temperature 1 Junction temperature 2 Storage temperature Symbol VIN VMAX VPGND Topr(Ta) Tjmax1 Tjmax2 Tstg Ratings 6 –0.3 to (VIN + 0.3) Unit V V Note 1 1 –0.3 to +0.3 –40 to +85 +125 +150 –55 to +150 V °C °C °C °C 1 Notes: 1. Rated voltages are with reference to the AGND pin. 2. Operation by Tjmax2 is made within 24 hours through life. REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 2 of 9 2 R2A20101BM/NP Pin Arrangement R2A20101BM (CSP-15) 5 4 3 A A5 B A3 B4 F 13 14 15 16 17 18 B2 D4 E E5 1 A1 C3 C C5 D 2 R2A20101NP (QFN-24) C1 D2 E3 F4 12 19 11 20 10 21 9 22 8 23 7 24 E1 F2 (Bottom view) 6 5 4 3 2 1 (Bottom view) Pin Description Pin No. R2A20101BM (CSP-15) A1, A3, A5 B2, B4 C1, C3, C5 D4 D2 R2A20101NP (QFN-24) 15, 16, 17 11, 20 10, 21 22 9 E5 E1 F4 E3 F2 23 8 2 5 4 Note: Pin Name Pin Function PGND LX VIN ON/OFF CRFB Power ground Inductor connection node Power supply voltage input Output on/off control input CR feedback input PWGD VFB EAO VREF AGND Power good monitor output Feedback voltage input Error amplifier output (for current share) Vout control voltage input Analog ground (IC chip ground voltage) Please apply solder to pins 1, 3, 6, 7, 12, 13, 14, 18, 19, and 24 even though they are NC pins. Solder on the underside pads improves heat-radiation characteristics. REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 3 of 9 R2A20101BM/NP Electrical Characteristics (Ta = 25°C, Vin = 3.6 V, ON/OFF = Vin, unless otherwise specified.) Item Symbol Min Typ Max Unit Input voltage range Vin 2.5 — 5.5 V UVL threshold high Vuvl-Hi 2.0 2.3 2.5 V UVL hysteresis Vuvl-Hys 0.15 0.22 0.29 V Quiescent supply current Iss 20 45 80 µA Shutdown supply current Ishdn — 0.0 1.0 µA Test Conditions VFB = CRFB = GND, Vin = rising ON/OFF = 0V Reference voltage Vref 0.485 0.500 0.515 V Vref line regulation dVref/dVin (–0.4) 0.1 (0) %/V Vref temperature stability dVref/dTa — (±100) — ppm/°C VREF sink current Ivref-sink 1.3 3.7 8.0 µA Vref = 2.5V VREF source current Ivref-source 0.3 0.9 2.0 µA Vref = 0V VFB leakage current Ileak-VFB –1 0 +1 µA VFB = 1/2 × Vin Pch FET on resistance Ron-Pch — 0.30 0.50 Ω VFB = CRFB = 0V, ILX = –100mA Nch FET on resistance Ron-Nch — 0.14 0.25 Ω VFB = CRFB = Vin, ILX = 100mA Vin = 2.5 to 5.5V Ta = –40 to +85°C Pch FET leakage current Ileak-Pch — — 1.0 µA ON/OFF = 0V, LX = 0V Nch FET leakage current Ileak-Nch — — 1.0 µA ON/OFF = 0V, LX = Vin Peak current limit Ipeak-Limit 0.7 — — A ON/OFF threshold high Von/off-Hi 1.0 1.45 1.85 V ON/OFF = rising ON/OFF threshold low Von/off-Lo 0.75 1.24 1.65 V ON/OFF = falling ON/OFF leakage current Ileak-on/off –1 0 +1 µA ON/OFF = Vin ON/OFF input current Iinput-on/off — 1.4 5 µA ON/OFF = 0.9V Switching frequency fsw Soft start time tss Power good threshold Vth-PGood Power good VOL Adjustable by external Ccf1, Rcf1, Rcf2 Hz 56 × Rcf1/(Rcf1 + Rcf2) × Vout µs (–15) –10 (–5) % Vref = 0.5V Ipg-VOL 20 — — µA PWGD = 0.2V, VFB = 0V Power good VOH Ipg-VOH –10 — — µA PWGD = 3.4V, VFB = 0.5V Output voltage load regulation dVout/dIout — ±0.7 — %/A L = 2.2µH, Vout = 1.8V, Iout = 0 to 650mA Note: ( ) is design spec. REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 4 of 9 R2A20101BM/NP Main Characteristics CR Feedback Constant vs. Switching Frequency 1.8 1.7 fsw (MHz) 1.6 1.5 1.4 Rcf1: 3.3kΩ Rcf2: 2.2kΩ Rcf1: 10kΩ Rcf2: 6.8kΩ Rcf1: 33kΩ Rcf2: 22kΩ Rcf1: 330kΩ Rcf2: 220kΩ 1.3 1.2 1.1 1.0 1 10 100 Ccf1 (pF) 1000 10000 Range of CR Feedback Constant Selection 10000 2700 1100 Range of CR feedback constant selection Ccf1 (pF) 1000 100 33 12 10 1 2.2 10 100 220 1000 Rcf2 (kΩ) Reference Voltage vs. Ambient Temperature 0.520 Switching Operating Current vs. Ambient Temperature 14 0.515 12 10 0.505 Iin (mA) Vref (V) 0.510 0.500 0.495 8 6 0.490 4 0.485 2 0.480 –50 –25 0 25 50 Ta (°C) 75 REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 5 of 9 100 125 0 –50 –25 0 25 50 Ta (°C) 75 100 125 R2A20101BM/NP Shutdown Current vs. Ambient Temperature 1.4 Vout Line Regulation 1.0 Vout (V) Ishdn (µA) 1.2 0.8 0.6 0.4 0.2 0.0 –50 –25 0 25 50 Ta (°C) 75 1.90 1.88 1.86 1.84 1.82 1.80 1.78 1.76 1.74 1.72 1.70 2.5 100 125 Vout, EAO (V) 0 50 100 150 200 250 300 350 400 450 500 550 600 650 Vout (V) 3.5 4.0 4.5 5.0 5.5 VREF Impressed Voltage vs. Vout Vin = 3.6V, Vout = 1.8V Iout (mA) Transient Response Characteristics [⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅T⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅⋅] VIN = 3.6V Vout = 1.8V Iout = 0 <-> 650mA 3.0 Vin (V) Vout Load Regulation 1.90 1.88 1.86 1.84 1.82 1.80 1.78 1.76 1.74 1.72 1.70 Vout = 1.8V, Iout = 0A 50µs/div Vout(100mV/div.) Iout: 0mA->650mA->0mA T Iout(500mV/div.) 4 REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 6 of 9 5.5 LX 5.0 CRFB 4.5 4.0 VFB 3.5 VREF 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0.0 L 2.2µH VOUT Rcf2 68kΩ Rvf2 390kΩ Rcf1 Ccf1 100kΩ 47pF Cout Rvf1 4.7µF 150kΩ Vout (Ta = –40°C) Vout (Ta = 85°C) EAO (Ta = –40°C) EAO (Ta = 85°C) 0.5 1.0 VREF (V) 1.5 R2A20101BM/NP Application Circuit Example 1. Current Share 1 (Redundant, Hot Swap type) R2A20101 Vin LX VIN ON1 ON/OFF PGND PWGD CRFB EAO VFB AGND VREF Vout Vout Gnd R2A20101 Iout1 LX VIN ON2 Iout2 ON/OFF PGND PWGD CRFB ON1 VFB ON2 EAO AGND VREF for Stable Note: Dotted line is not always necessary. 2. Current Share 2 (Accuracy type) R2A20101 Vin VIN ON LX ON/OFF PGND PWGD CRFB EAO VFB AGND VREF for Accuracy Vout for Accuracy Gnd R2A20101 VIN LX ON/OFF PGND PWGD CRFB EAO VREF VFB AGND for Stable for Soft start time adjustment Note: Dotted line is not always necessary. REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 7 of 9 Be able to eliminate by connecting VFB together R2A20101BM/NP 3. Sequential Start-up R2A20101 Vin VIN ON PGood1 LX ON/OFF PGND PWGD CRFB EAO Vout1 VFB Vout1 AGND VREF Vout2 for Soft start time adjustment PGood1 for Sequencing R2A20101 VIN PGood2 Vout2 LX ON/OFF PGND PWGD CRFB EAO VFB AGND VREF for Soft start time adjustment Note: Dotted line is not always necessary. 4. Tracking Vin ON R2A20101 LX VIN ON/OFF PGND PWGD CRFB EAO Vout1 Vout1 Vout2 VFB DAC AGND VREF for Tracking for Vout control R2A20101 LX VIN ON/OFF PGND PWGD CRFB EAO VREF VFB AGND Note: Dotted line is not always necessary. REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 8 of 9 Vout2 R2A20101BM/NP Package Dimensions Unit: mm Preliminary 1.26 ± 0.05 0.46 3 2 1 4 0.4 1.96 ± 0.05 0 5 0.08 ± 0.03 7 8 9 11 6 10 14 13 12 15 0.20 ± 0.03 0.07 0.4 ± 0.02 (Bottom view) Package Code JEDEC JEITA Mass (reference value) CSP-15 — — — Unit: mm Preliminary B 4.00 ± 0.10 A 13 2.50 18 19 2.50 4.00 ± 0.10 12 C0.40 0.15 C Pin No.1 0.15 C 6 24 × 0.23 ± 0.05 0.10 C 24 × 0.50 0.40 ± 0.1 24 7 0.10 M C A B REJ03D0790-0300 Rev.3.00 May 14, 2008 Page 9 of 9 0–0.05 0.08 C 0.80Max 0.20 C Package Code JEDEC JEITA Mass (reference value) WQFN0404-24 — — — Sales Strategic Planning Div. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Notes: 1. This document is provided for reference purposes only so that Renesas customers may select the appropriate Renesas products for their use. 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