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MAX5090CATE-T Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5090CATE-T Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 17 page 2A, 76V, High-Efficiency MAXPower Step-Down DC-DC Converters _______________________________________________________________________________________ 7 Pin Description PIN NAME FUNCTION 1, 2 LX Source Connection of Internal High-Side Switch 3 BST Boost Capacitor Connection. Connect a 0.22µF ceramic capacitor from BST to LX. 4VIN Input Voltage. Bypass VIN to SGND with a low-ESR capacitor as close to the device as possible. 5VD Internal Regulator Output. Bypass VD to PGND with a 3.3µF/10V or greater ceramic capacitor. 6 SYNC Synchronization Input. Connect SYNC to an external clock for synchronization. Connect to SGND to select the internal 127kHz switching frequency. 7SS Soft-Start Capacitor Connection. Connect an external capacitor from SS to SGND to adjust the soft- start time. 8FB Output Sense Feedback Connection. For fixed output voltage (MAX5090A/MAX5090B), connect FB to VOUT. For adjustable output voltage (MAX5090C), use an external resistive voltage-divider to set VOUT. VFB regulating set point is 1.228V. 9 ON/OFF Shutdown Control Input. Pull ON/OFF low to put the device in shutdown mode. Drive ON/OFF high for normal operation. Connect ON/OFF to VIN with short leads for always-on operation. 10 SGND Signal Ground. SGND must be connected to PGND for proper operation. 11, 15, 16 N.C. No Connection. Not internally connected. 12 PGND Power Ground 13, 14 DRAIN Internal High-Side Switch Drain Connection —EP Exposed Pad. Solder EP to SGND plane to aid in heat dissipation. Do not use as the only electrical ground connection. Detailed Description The MAX5090 step-down DC-DC converter operates from a 6.5V to 76V input voltage range. A unique volt- age-mode control scheme with voltage feed-forward and an internal switching DMOS FET provides high effi- ciency over a wide input voltage range. This pulse- width-modulated converter operates at a fixed 127kHz switching frequency or can be synchronized with an external system clock frequency. The device also fea- tures automatic pulse-skipping mode to provide high efficiency at light loads. Under no load, the MAX5090 consumes only 310µA, and in shutdown mode, con- sumes only 20µA. The MAX5090 also features under- voltage-lockout, hiccup-mode output short-circuit protection and thermal shutdown. ON/OFF/Undervoltage Lockout (UVLO) Use the ON/OFF function to program the external UVLO threshold at the input. Connect a resistive voltage- divider from VIN to SGND with the center node to ON/OFF, as shown in Figure 1. Calculate the threshold value by using the following formula: Set the external VUVLO(TH) to greater than 6.45V. The maximum recommended value for R2 is less than 1M Ω. ON/OFF is a logic input and can be safely driven to the full VIN range. Connect ON/OFF to VIN for automatic startup. Drive ON/OFF to ground to shut down the MAX5090. Shutdown forces the internal power MOSFET off, turns off all internal circuitry, and reduces the VIN supply current to 20µA (typ). The ON/OFF rising thresh- old is 1.546V (max). Before any operation begins, the voltage at ON/OFF must exceed 1.546V. The ON/OFF input has 100mV hysteresis. If the external UVLO threshold setting divider is not used, an internal undervoltage-lockout feature monitors the supply voltage at VIN and allows the operation to start when VIN rises above 6.45V (max). The internal UVLO rising threshold is set at 6.17V with 0.5V hystere- sis. The VIN and VON/OFF voltages must be above 6.5V and 1.546V, respectively, for proper operation. V R R x UVLO TH () . =+ 1 1 2 138 |
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