Part Number: R2A20101NP
Function: Monolithic Synchronous Step-Down DC/DC Converter
Manufacturer: Renesas Technology
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Description:
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 Cin 4.7 µ F Power Good Signal Output Error Amp. Output (for Current Share) Vref Input (for Vout Control) R2A20101 VIN ON/ OFF PWGD EAO LX PGND CRFB VFB L1 2.2 µ H Iout: Up to 650mA Vout 1.8V Rcf2 68k Ω Ccf1 47pF Rvf2 390k Ω Rvf1 150k Ω Rcf1 100k Ω Cout 4.7 µ F 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 R2A20101BM/NP Block Diagram ON/OFF SHDN Shut Down PWGD Power Good Comparator UVLO VIN Ref 1.15V 1.3MΩ VREF – + Vref × 10% + – PWM Control Logic LX PGND CRFB VFB AGND SS EAO 1MΩ 1.5kΩ Error Amplifier 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) –0.3 to +0.3 –40 to +85 +125 +150 –55 to +150 Unit V V V °C °C °C °C Note 1 1 1 2 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 R2A20101BM/NP Pin Arrangement R2A20101BM (CSP-15) 5 A A5 B C C5 D E E5 F F4 D4 E3 F2 B4 C3 D2 E1 10 R2A20101NP (QFN-24) 4 3 A3 2 1 A1 13 14 15 16 17 18 B2 C1 12 19 11 20 21 (Bottom view) 9 22 8 23 7 24 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 E5 E1 F4 E3 F2 Note: R2A20101NP (QFN-24) 15, 16, 17 11, 20 10, 21 22 9 23 8 2 5 4 Pin Name PGND LX VIN ON/OFF CRFB PWGD VFB EAO VREF AGND Pin Function Power ground Inductor connection node Power supply voltage input Output on/off control input CR feedback input 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 pi […]
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