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MAX8521EBX Datasheet(PDF) 9 Page - Maxim Integrated Products |
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MAX8521EBX Datasheet(HTML) 9 Page - Maxim Integrated Products |
9 / 18 page Smallest TEC Power Drivers for Optical Modules _______________________________________________________________________________________ 9 PIN TQFN UCSP NAME FUNCTION 10 A5 CTLI TEC Current-Control Input. Sets TEC current. Center point is 1.50V (no TEC current). The current is given by: ITEC = (VOS1 - VCS) / RSENSE = (VCTLI - 1.50) / (10 x RSENSE). When (VCTLI - VREF) > 0 then VOS2 > VOS1 > VCS. 11 A6 GND Analog Ground. Star connect to PGND at underside exposed pad for TQFN package. 12 B6 VDD Analog Supply Voltage Input. Bypass VDD to GND with a 1µF ceramic capacitor. For MAX8520: Analog FREQ Set Pin (see the Switching Frequency section). 13 C5 FREQ For MAX8521: Digital FREQ Selection Pin. Connect to VDD for 1MHz operation, connect to GND for 500kHz operation. The PWM oscillator can synchronize to FREQ by switching at FREQ between 700kHz and 1.2MHz. 14 D6, D5, D4 PGND2 Power Ground 2. Internal synchronous rectifier ground connection. Connect all PGND pins together at the power ground plane. 15 E5, E6 LX2 Inductor Connection. LX2 is high-impedance in shutdown. 16 F5, F6 PVDD2 Power Input 2. Connect all PVDD inputs together at the VDD power plane. 17 F4 CS Current-Sense Input. The current through the TEC is monitored between CS and OS1. The maximum TEC current is given by 150mV/RSENSE and is bipolar. 18 C6 OS2 Output Sense 2. OS2 senses one side of the differential TEC voltage. OS2 is a sense point, not a power output. OS2 discharges to ground in shutdown. 19 F3 OS1 Output Sense 1. OS1 senses one side of the differential TEC voltage. OS1 is a sense point, not a power output. OS1 discharges to ground in shutdown. 20 F1, F2 PVDD1 Power Input 1. Connect all PVDD inputs together at the VDD power plane. B2, B5, C3, C4 GND2 Ground. Additional ground pads aid in heat dissipation. Short to either GND or PGND plane. B3, B4 E3, E4 N.C. No Connect. Connect N.C. pads to GND2 to aid in heat dissipation. —— EP Exposed Paddle (TQFN Only). Internally connected to GND. Connect to a large ground plane to maximize thermal performance. Not intended as an electrical connection point. Pin Description (continued) |
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