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MAX1964TEEE Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1964TEEE Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 30 page Tracking/Sequencing Triple/Quintuple Power-Supply Controllers ______________________________________________________________________________________ 11 Detailed Description The MAX1964/MAX1965 power-supply controllers pro- vide system power for cable and xDSL modems. The main step-down DC-DC controller operates in a cur- rent-mode pulse-width-modulation (PWM) control scheme to ease compensation requirements and pro- vide excellent load and line transient response. The MAX1964 includes two analog gain blocks to regu- late two additional positive auxiliary output voltages, and the MAX1965 includes four analog gain blocks to regulate three additional positive and one negative aux- iliary output voltages. The positive regulator gain blocks can be used to generate low voltage rails directly from the main step-down converter or higher voltages using coupled windings from the step-down converter. The Figure 1. MAX1964 Standard Application Circuit BST C1 1 µF D1 CENTRAL CMPSH-3 C2 1 µF NH NL CBST 0.1 µF RPOK 100k Ω CCOMP1 470pF CCOMP2 47pF COUT 1000 µF CIN 470 µF DH LX VOUT1 5V AT 1A INPUT 9V TO 18V DL OUT GND TO LOGIC IN VL ILIM POK COMP MAX1964 FB RCOMP 5M Ω RGATE(NH) 10 Ω L1 33 µH RGATE(NL) 10 Ω RBE2 220 Ω C3 1 µF Q1 TIP30 R3 4.64k Ω R1 30k Ω R2 10k Ω VOUT2 1.8V AT 300mA C4 10 µF R4 10k Ω B2 FB2 B3 FB3 CBE2 2200pF INTERNATIONAL RECTIFIER IRF7101 RBE3 220 Ω C5 1 µF Q2 TIP32 POWER GROUND ANALOG GROUND COUT : 1000 µF, 10V SANYO (CZ SERIES) R5 4.99k Ω VOUT3 3.3V AT 750mA C6 10 µF R4 3.0k Ω CBE3 1000pF |
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