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MAX8741ETJ Datasheet(PDF) 10 Page - Maxim Integrated Products |
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MAX8741ETJ Datasheet(HTML) 10 Page - Maxim Integrated Products |
10 / 33 page 500kHz Multi-Output Power-Supply Controllers with High Impedance in Shutdown 10 ______________________________________________________________________________________ Pin Description (continued) PIN SSOP TQFN NAME FUNCTION 15 13 SEQ Pin-Strap Input that Selects the SMPS Power-Up Sequence: SEQ = GND: 5V before 3.3V, RESET output determined by both outputs SEQ = REF: Separate ON3/ON5 controls, RESET output determined by 3.3V output SEQ = VL: 3.3V before 5V, RESET output determined by both outputs 16 14 DH5 Gate-Drive Output for the 5V, High-Side N-Channel Switch. DH5 is a floating driver output that swings from LX5 to BST5, riding on the LX5 switching-node voltage. 17 15 LX5 Switching-Node (Inductor) Connection. Can swing 2V below ground without hazard. 18 17 BST5 Boost Capacitor Connection for High-Side Gate Drive (0.1µF) 19 18 DL5 Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0 to VL. 20 19 PGND Power Ground 21 20 VL 5V Internal Linear-Regulator Output. VL is also the supply-voltage rail for the chip. After the 5V SMPS output has reached 4.5V (typ), VL automatically switches to the output voltage through CSL5 for bootstrapping. Bypass to GND with 4.7µF. VL supplies up to 25mA for external loads. 22 21 V+ Battery Voltage Input, 4.2V to 30V. Bypass V+ to PGND close to the IC with a 0.22µF capacitor. Connects to a linear regulator that powers VL. 23 22 SHDN Shutdown Control Input, Active Low. Logic threshold is set at approximately 1V. For automatic startup, connect SHDN to V+ through a 220kΩ resistor and bypass SHDN to GND with a 0.01µF capacitor. 24 23 DL3 Gate-Drive Output for the Low-Side Synchronous-Rectifier MOSFET. Swings 0 to VL. 25 24 BST3 Boost Capacitor Connection for High-Side Gate Drive (0.1µF) 26 26 LX3 Switching-Node (Inductor) Connection. Can swing 2V below ground without hazard. 27 27 DH3 Gate-Drive Output for the 3.3V, High-Side N-Channel Switch. DH3 is a floating driver output that swings from LX3 to BST3, riding on the LX3 switching-node voltage. 28 28 RUN/ON3 ON/OFF Control Input. See the Power-Up Sequencing and ON/OFF Controls section. — 6, 16, 25, 32 N.C. No Connection |
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