LTC3414 ® ■ ■ ■ µ ■ Ω ■ Ω ■ ■ ■ ■ ® ® ■ ■ ■ ■ ■ ■ ■ ■ ■ VIN 2.7V TO 5.5V 22µF 100 PVIN SVIN RITH* 0.47µH LTC3414 294k 1000pF 95 PGOOD VOUT 2.5V AT 4A SW RUN/SS PGND ITH SGND VFB SYNC/MODE COUT* 85 80 75 FORCED CONTINUOUS 70 65 470pF 60 110k 392k 55 75k 3414 F01a * Burst Mode OPERATION 90 EFFICIENCY (%) RT 2.2M COUT = 470µF SANYO POSCAP 4TPB470M, RITH = 20k COUT = (2) 100µF TDKC4532X5ROJ107M, RITH = 12.1k 50 0.001 0.01 0.1 1.0 LOAD CURRENT (A) 10 3414 F01b 3414f 1 LTC3414 TOP VIEW PGND 1 RT 2 19 VFB SYNC/MODE 3 18 ITH RUN/SS 4 SGND 5 ORDER PART NUMBER 20 PGND LTC3414EFE 17 PGOOD 21 NC 6 16 SVIN 15 NC PVIN 7 14 PVIN SW 8 13 SW SW 9 12 SW PGND 10 11 PGND FE PACKAGE 20-LEAD PLASTIC TSSOP EXPOSED PAD (PIN 21) MUST BE SOLDERED TO PCB TJMAX = 125°C, θJA = 38°C/W, θJC = 10°C/W ● SYMBOL VIN IFB VFB ∆VFB VLOADREG PARAMETER Input Voltage Range Feedback Pin Input Current Regulated Feedback Voltage Reference Voltage Line Regulation Output Voltage Load Regulation ∆VPGOOD RPGOOD IQ Power Good Range Power Good Resistance Input DC Bias Current Active Current Sleep Shutdown Switching Frequency Switching Frequency Range SYNC Capture Range RDS(ON) of P-Channel FET RDS(ON) of N-Channel FET Peak Current Limit Undervoltage Lockout Threshold SW Leakage Current RUN Threshold fOSC fSYNC RPFET RNFET ILIMIT VUVLO ILSW VRUN CONDITIONS (Note 3) (Note 3) VIN = 2.7V to 5.5V (Note 3) Measured in Servo Loop, VITH = 0.36V Mesured in Servo Loop, VITH = 0.84V (Note 4) VFB = 0.75V, VITH = 1.2V VFB = 1V, VITH = 0V, VSYNC/MODE = 0V VRUN = 0V ROSC = 294k TYP ● MIN 2.25 ● 0.784 0.800 0.04 0.02 –0.02 ±7.5 120 ● ● ● 0.88 0.3 0.3 ISW = 300mA ISW = –300mA 6 1.75 VRUN = 0V, VIN = 5.5V 0.5 250 64 0.02 1.00 67 50 8 2.00 0.1 0.65 MAX 5.5 0.2 0.816 0.2 0.2 –0.2 ±9 200 UNITS V µA V %V % % % Ω 330 100 1 1.12 4 4 100 100 µA µA µA MHz MHz MHz mΩ mΩ A V µA V 2.25 1.0 0.8 3414f 2 LTC3414 120 90 0.800 TA = 25°C 80 0.797 ON-RESISTANCE (mΩ) 0.798 100 PFET 70 ON-RESISTANCE (mΩ) VREF (V) 0.799 60 NFET 50 40 30 20 0.796 80 PFET NFET 60 40 20 10 0.795 –40 –20 0 0 2.25 2.75 3.25 3.75 4.25 4.75 5.25 INPUT VOLTAGE (V) 20 40 60 80 100 120 140 TEMPERATURE (°C) 7000 TA = 25°C 14 PFET 12 10 8 6 5000 4000 3000 2000 NFET 1000 980 960 940 4 920 1000 2 5.25 25 125 225 325 425 525 625 725 825 925 ROSC (k) 3414 G04 350 VIN = 3.3V ROSC = 294k QUIESCENT CURRENT (µA) 1030 1010 990 970 950 ACTIVE 250 200 150 100 SLEEP 50 930 910 –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 3414 G07 0 2.25 2.75 3.25 3.75 4.25 4.75 INPUT VOLTAGE (V) 5.25 3414 G08 5.25 3414 G06 5.0 TA = 25°C 300 1050 2.75 3.25 3.75 4.25 4.75 INPUT VOLTAGE (V) 3414 G05 1090 1070 900 2.25 0 2.75 3.25 3.75 4.25 4.75 INPUT VOLTAGE (V) MINIMUM PEAK INDUCTOR CURRENT (A) 0 2.25 FREQUENCY (kHz) ROSC = 294k TA = 25°C 1020 FREQUENCY (kHz) 16 1040 VIN = 3.3V TA = 25°C 6000 FREQUENCY (kHz) SWITCH LEAKAGE CURRENT (nA) 18 3414 G03 3414 G02 3414 G01 20 0 –40 –25 –10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 5.75 VIN = 3.3V TA = 25°C 4.5 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 BURST CLAMP VOLTAGE (V) 0.8 3414 G09 3414f 3 LTC3414 95 80 VIN = 5V EFFICIENCY (%) 85 80 75 70 100 VOUT = 2.5V 90 TA = 25°C VIN = 3.3V 90 EFFICIENCY (%) 100 TA = 25°C 90 VIN = 3.3V 70 VIN = 5V 60 50 40 75 70 65 60 20 60 55 10 55 0.01 0.1 1 LOAD CURRENT (A) 0 0.001 10 0.01 0.1 1 LOAD CURRENT (A) IOUT = 1A 94 VIN = 3.3V VOUT = 2.5V 50 0.001 10 0.01 0.1 1 LOAD CURRENT (A) 3414 G11 98 96 FORCED CONTINUOUS 80 30 3414 G10 100 VOUT = 2.5V TA = 25°C 95 10 3414 G12 0 VIN = 3.3V VOUT = 2.5V TA = 25°C L = 1µH VIN = 3.3V VOUT = 2.5V TA = 25°C –0.05 L = 0.47µH 90 88 IOUT = 4A 86 84 82 90 ∆VOUT/VOUT (%) EFFICIENCY (%) 92 EFFICIENCY (%) 85 65 50 0.001 TA = 25°C Burst Mode OPERATION 95 EFFICIENCY (%) 100 L = 0.2µH 85 80 –0.10 –0.15 –0.20 75 –0.25 70 300 800 1300 1800 2300 2800 3300 3800 FREQUENCY (kHz) –0.30 80 78 2.5 3.0 4.0 4.5 3.5 INPUT VOLTAGE (V) 5.0 5.5 3414 G13 OUTPUT VOLTAGE 100mV/DIV INDUCTOR CURRENT 500mA/DIV INDUCTOR CURRENT 2A/DIV VIN = 3.3V, VOUT = 2.5V LOAD = 250mA 0.5 1.0 1.5 2.0 2.5 3.0 LOAD CURRENT (A) 3414 G14 OUTPUT VOLTAGE 20mV/DIV 10µs/DIV 0 3414 G16 3.5 4.0 3414 G15 20µs/DIV 3414 G17 VIN = 3.3V, VOUT = 2.5V LOAD STEP = 0A TO 4A 3414f 4 LTC3414 OUTPUT VOLTAGE 100mV/DIV VRUN OUTPUT VOLTAGE INDUCTOR CURRENT 2A/DIV INDUCTOR CURRENT 2A/DIV 20µs/DIV VIN = 3.3V, VOUT = 2.5V LOAD STEP = 250mA TO 4A 3414 G18 1ms/DIV VIN = 3.3V, VOUT = 2.5V LOAD = 4A 3414 G19 µ 3414f 5 LTC3414 0.8V SVIN SGND ITH EXPOSED PAD PVIN PVIN 16 5 18 21 7 14 PMOS CURRENT COMPARATOR SLOPE COMPENSATION RECOVERY VOLTAGE REFERENCE + BCLAMP + – VFB 19 – 0.74V + ERROR AMPLIFIER SYNC/MODE – + V SLOPE COMPENSATION BURST COMPARATOR + OSCILLATOR – 4 LOGIC RUN SW 9 SW 12 SW – RUN/SS NMOS CURRENT COMPARATOR 8 13 SW + + 0.86V CURRENT REVERSAL COMPARTOR – PGOOD 17 1 PGND + 10 PGND – 11 PGND 2 3 20 RT SYNC/MODE PGND 3414 BD 3414f 6 LTC3414 µ 3414f 7 LTC3414 V V L = OUT 1 – OUT f∆IL(MAX) VIN(MAX) ROSC = 3.08 • 1011 Ω – 10kΩ f ( ) • • ∆ V V ∆IL = OUT 1– OUT VIN fL ∆ 3414f 8 LTC3414 IRMS = IOUT (MAX) VOUT VIN VIN –1 VOUT ∆ 1 ∆VOUT ≤ ∆IL ESR + 8fC OUT ∆ R2 VOUT = 0.8V 1 + R1 VOUT R2 VFB LTC3414 R1 SGND 3414 F02 3414f 9 LTC3414 6.9A IBURST = VBURST – 0.383V 0.6V ( ) µ VIN tSS = RSS C SS ln (SECONDS) VIN – 1.8V 3414f 10 LTC3414 tr = (PD)(θJA) θ θ TJ = TA + tr RSW = (RDS(ON)TOP)(DC) + (RDS(ON)BOT)(1 – DC) ∆ ∆ 3414f 11 LTC3414 6.9A IBURST = VBURST – 0.383V = 1.23A 0.6V ( ) R2 + R3 = 200k 1+ ROSC = 3.08 • 1011 1• 106 R2 0.8V = R3 0.49V – 10k = 298k R1 2.5V = 202.7k 0.8V R1 = 432k 1+ 2.5V 2.5V L= = 0.63µH 1– (1MHz)(1.6A) 4.2V µ 2.5V 2.5V ∆IL = = 2.15A 1– (1MHz)(0.47µH) 4.2V µ µ 2.5V 4.2V IRMS = (4A) – 1 = 1.96ARMS 4.2V 2.5V µ µ 3414f 12 LTC3414 1 ROSC 294k 2 3 RSS 2.2M CSS 1000pF X7R 4 5 6 7 8 + CIN2*** 330µF 9 10 PGND PGND VFB RT ITH SYNC/MODE RUN/SS PGOOD SVIN SGND C1 10pF X7R 20 19 18 R3 124k CITH 470pF X7R R2 78.7k RITH 20k R1 432k 17 16 PGOOD RPG 100k LTC3414 NC PVIN NC PVIN SW SW SW SW PGND PGND VIN 2.7V TO 5V CIN1 22µF X5R 2X 15 14 13 12 11 L1* 0.47µH COUT2 22µF X5R VOUT 2.5V 4A + COUT1** 470µF 3413 F04 * VISHAY DALE IHLP-2525CZ-01 ** SANYO POSCAP 4TPD470M *** SANYO POSCAP 6TPB330M 3414f 13 LTC3414 1 ROSC 294k 2 3 RSS 2.2M 4 CSS 1000pF X7R 5 6 7 8 + CIN2*** 150µF 9 10 PGND PGND RT VFB SYNC/MODE ITH PGOOD RUN/SS SVIN SGND 20 19 18 CC 100pF X7R CITH 470pF X7R RITH 12.1k R1 634k 17 NC PVIN PVIN SW SW SW SW PGND PGND 16 CIN1 22µF X5R 2x 15 L1* 0.68µH 13 VOUT 3.3V 4A 12 COUT** 100µF 2x 11 3413 F05 1 ROSC 294k 2 PGND PGND VFB RT 1.25MHz 3 SYNC/MODE CLOCK CSS 1000pF X7R 4 5 6 7 8 + CIN2*** 220µF 9 10 * VISHAY DALE IHLP-2525CZ-01 ** TDK C4532X5ROJ107M *** SANYO POSCAP 4TPB220M VIN 5V 14 * MURATA LQH66SNR68M03L ** TDK C4532X5ROJ107M *** SANYO POSCAP 6TPE150M RSS 2.2M C1 22pF X7R PGOOD RPG 100k LTC3414 NC R2 200k RUN/SS ITH PGOOD SVIN SGND 20 19 18 CC 100pF X7R CITH 470pF X7R RITH 12.1k R1 422k 17 16 PVIN NC PVIN SW SW SW SW PGND PGND C1 22pF X7R PGOOD RPG 100k VIN 3.3V CIN1** 100µF 2x LTC3414 NC R2 200k 15 14 13 12 11 L1* 0.47µH VOUT 2.5V 4A COUT** 100µF 2x 3413 F06 3414f 14 LTC3414 (Reference LTC DWG # 05-08-1663) 6.40 – 6.60* (.252 – .260) 4.95 (.195) 4.95 (.195) 20 1918 17 16 15 14 13 12 11 6.60 ±0.10 2.74 (.108) 4.50 ±0.10 2.74 6.40 (.108) BSC SEE NOTE 4 0.45 ±0.05 1.05 ±0.10 0.65 BSC 1 2 3 4 5 6 7 8 9 10 RECOMMENDED SOLDER PAD LAYOUT 1.20 (.047) MAX 4.30 – 4.50* (.169 – .177) 0° – 8° 0.09 – 0.20 (.0036 – .0079) 0.45 – 0.75 (.018 – .030) NOTE: 1. CONTROLLING DIMENSION: MILLIMETERS MILLIMETERS 2. DIMENSIONS ARE IN * (INCHES) 3. DRAWING NOT TO SCALE 0.65 (.0256) BSC 0.195 – 0.30 (.0077 – .0118) 0.05 – 0.15 (.002 – .006) FE20 (CA) TSSOP 0203 4. RECOMMENDED MINIMUM PCB METAL SIZE FOR EXPOSED PAD ATTACHMENT *DIMENSIONS DO NOT INCLUDE MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.150mm (.006") PER SIDE 3414f 15 LTC3414 1 ROSC 294k 2 3 RSS 2.2M 4 CSS 1000pF, X7R 5 6 7 + 8 CIN2** 470µF 9 10 PGND PGND RT VFB SYNC/MODE RUN/SS ITH PGOOD SGND SVIN LTC3414 NC PVIN NC PVIN SW SW SW SW PGND PGND 20 19 18 CC 100pF X7R CITH 470pF X7R R2 200k RITH 15k C1 39pF X7R R1 178k 17 PGOOD RPG 100k 16 15 14 L1* 0.44µH 13 12 VOUT 1.5V 4A + COUT2 22µF X5R 11 VIN 2.5V CIN1 22µF X5R 2x * PULSE P1166.68IT ** SANYO POSCAP 4TPD470M COUT1** 470µF 3413 TA01 µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ µ 3414f 16 1003 0.2K • PRINTED IN JAPAN • • LINEAR TECHNOLOGY CORPORATION 2003