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MAX17005B Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX17005B Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 21 page 1.2MHz, Low-Cost, High-Performance Chargers 10 ______________________________________________________________________________________ BATT ADAPTER BST CSSP CSSN DHI LX DLO PGND RS1 15m Ω CSIN CSIP BATT BATTERY CC VCTL ISET LDO AGND IINP VAA ADAPTER PWM SIGNAL R1 22.6k Ω C4 0.68 μF C2 0.1 μF C5 0.01 μF R2 R3 R4 200k Ω R6 200k Ω CIN COUT RS2 10m Ω N1 N2 N3 N4 Q1b C3 1 μF C1 4.7 μF R7 R8 ONLY FOR MAX17015B L1 SYSTEM LOAD D1 C6 1 μF CIN = 2 x 4.7 μF COUT = 4.7 μF L1 = 2 μH R9 2M Ω Q1a DCIN C7 0.1 μF RACIN1 RACIN2 ACIN ACOK LDO 10k Ω MAX17005B MAX17006B MAX17015B Figure 1. Typical Operating Circuit Detailed Description The MAX17005B/MAX17006B/MAX17015B include all the functions necessary to charge Li+, NiMH, and NiCd batteries. An all n-channel synchronous-rectified step- down DC-DC converter is used to implement a preci- sion constant-current, constant-voltage charger. The charge current and input current-limit sense amplifiers have low-input offset errors (250μV typ), allowing the use of small-value sense resistors. The MAX17005B/MAX17006B/MAX17015B use a new thermally optimized high-frequency architecture. With this new architecture, the switching frequency is adjusted to control the power dissipation in the high-side MOSFET. Benefits of the new architecture include reduced output capacitance and inductance, resulting in smaller PCB area and lower cost. |
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