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LTC1439CG 数据表(PDF) 25 Page - Linear Technology |
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LTC1439CG 数据表(HTML) 25 Page - Linear Technology |
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25 / 32 page  25 LTC1438/LTC1439 The previous instructions will yield a PC layout which has three separate ground regions returning separately to the bottom plates of the output capacitors: a signal ground, a MOSFET gate/INTVCC ground and the ground from the input capacitors, Schottky diode and synchronous MOSFET. In practice, this may produce a long power ground path from the input and output capacitors. A long, low resistance path between the input and output capaci- tor power grounds will not upset the operation of the switching controllers as long as the signal and power grounds from the IC pins does not “tap in” along this path. APPLICATIONS INFORMATION current, reducing the susceptibility to both the “loop” radiated magnetic fields and the transformer or inductor leakage fields. The capacitor on INTVCC acts as a reservoir to supply the high transient currents to the bottom gates and to re- charge the boost capacitor. This capacitor should be a 4.7 µFtantalumcapacitorplacedascloseaspossibletothe INTVCC and PGND pins of the IC. Peak current driving the MOSFET gates exceeds 1A. The PGND pin of the IC, connected to this capacitor, should connect directly to the lower plates of the output capacitors to minimize the AC ripple on the INTVCC IC power supply. TYPICAL APPLICATIONS LTC1438 5V/3A, 3.3V/3.5A Regulator 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 SENSE+ 1 SENSE– 1 VPROG1 ITH1 POR2 COSC SGND LBI LBO SFB1 ITH2 VOSENSE2 SENSE– 2 SENSE+ 2 RUN/SS1 BOOST 1 TGL1 SW1 VIN BG1 INTVCC PGND BG2 EXTVCC SW2 TGL2 BOOST 2 RUN/SS2 LTC1438 0.1 µF 22 µF 35V 0.1 µF 1438 TA01 + 1000pF 100 Ω 100 Ω 1000pF 10 Ω VIN 5.2V TO 28V: SWITCHING FREQUENCY = 180kHz 5V, 3A/3.3V, 3.5A M1 TO M4: Si4412DY INPUT CAPACITORS ARE AVX-TPS SERIES OUTPUT CAPACITORS ARE AVX-TPSV LEVEL II SERIES INTVCC POR2 LBI LBO 0.1 µF 1000pF 1000pF 220pF 470pF 10k 10 Ω M1 M2 M4 M3 CMDSH-3 CMDSH-3 10k 221k, 1% 56pF 1k 10 Ω 392k, 1% 1000pF 56pF 220pF 0.1 µF 0.1 µF VOUT1 4.7 µF 16V 0.033 Ω 0.033 Ω 22 µF 35V + MBRS140T3 MBRS140T3 10 µH SUMIDA CDRH125-100MC 10 µH SUMIDA CDRH125-100MC 220 µF 10V VIN 5.2V TO 28V VOUT1 5V 3A VOUT2 3.3V 3.5A GND 220 µF 10V 22 µF 35V + 22 µF 35V 1N4148 1N4148 22pF |
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