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MAX17524 Fiches technique(PDF) 12 Page - Maxim Integrated Products |
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MAX17524 Fiches technique(HTML) 12 Page - Maxim Integrated Products |
12 / 24 page PIN NAME FUNCTION 7 SS1 Soft-Start Input for Converter 1. Connect a capacitor from SS1 to SGND to set the soft-start time. 8 CF1 Compensator Output for Converter 1. At switching frequencies, lower than 450kHz, connect a capacitor from CF1 to FB1. Leave CF1 open if the switching frequency is equal to, or more than 450kHz. See the Loop Compensation section for more details. 9 FB1 Feedback Input for Converter 1. Connect FB1 to the center tap of an external resistor-divider from the output node of converter 1 to SGND to set the output voltage. See the Adjusting Output Voltage section for more details. 10 RT Programmable Switching Frequency Input. Connect a resistor from RT to SGND to set the switching frequency of both the converters. Leave RT open for the default 450kHz frequency. See the Setting the Switching Frequency (RT) section for more details. 11 RESET1 Open-Drain RESET1 Output. The RESET1 output is driven low if FB1 drops below 92.5% of its set value. RESET1 goes high 1024 cycles after FB1 rises above 95.5% of its set value. 12 MODE/ SYNC1 Mode Selection and External Clock Synchronization Input for Converter 1. The MODE/SYNC1 Pin configures the converter 1 to operate either in PWM, PFM or DCM modes of operation. Leave MODE/ SYNC1 unconnected for PFM operation (pulse skipping at light loads). Connect MODE/SYNC1 to SGND for constant-frequency PWM operation at all loads. Connect MODE/SYNC1 to VCC1 for DCM operation at light loads. MODE/SYNC1 can also be used to synchronize the converter 1 to an external clock irre- spective of the operating condition of converter 2. See the Mode Selection and External Synchronization (MODE/SYNC) section for more details. 13 SGND Analog Ground 14 MODE/ SYNC2 Mode Selection and External Clock Synchronization Input for Converter 2. The MODE/SYNC2 Pin configures the converter 2 to operate either in PWM, PFM or DCM modes of operation. Leave MODE/ SYNC2 unconnected for PFM operation (pulse skipping at light loads). Connect MODE/SYNC2 to SGND for constant-frequency PWM operation at all loads. Connect MODE/SYNC2 to VCC2 for DCM operation at light loads. MODE/SYNC2 can also be used to synchronize the converter 2 to an external clock irre- spective of the operating condition of converter 1. See the Mode Selection and External Synchronization (MODE/SYNC) section for more details. 15 RESET2 Open-Drain RESET2 Output. The RESET2 output is driven low if FB2 drops below 92.5% of its set value. RESET2 goes high 1024 cycles after FB2 rises above 95.5% of its set value. 16 FB2 Feedback Input for Converter 2. Connect FB2 to the center tap of an external resistor-divider from the output node of converter 2 to SGND to set the output voltage. See the Adjusting Output Voltage section for more details. 17 CF2 Compensator Output for Converter 2. At switching frequencies, lower than 450kHz, connect a capacitor from CF2 to FB2. Leave CF2 open if the switching frequency is equal to, or more than 450kHz. See the Loop Compensation section for more details. 18 SS2 Soft-Start Input for Converter 2. Connect a capacitor from SS2 to SGND to set the soft-start time. 19 EXTVCC2 External Power-Supply Input for the Internal LDO of Converter 2. Applying a voltage between 4.84V and 24V at the EXTVCC2 pin bypasses the internal LDO and improves efficiency. Add a local bypassing cap (0.1μF) on EXTVCC2 pin to SGND and also add a 4.7Ω resistor from the buck converter output node to the EXTVCC2 pin to limit VCC2 bypass-cap discharge current during an output short-circuit condition. When EXTVCC2 is not used, connect it to SGND. Pin Description (continued) www.maximintegrated.com Maxim Integrated │ 12 MAX17524 4.5V to 60V, 3A, Dual-Output, High-Efficiency, Synchronous Step-Down DC-DC Converter |
Numéro de pièce similaire - MAX17524 |
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Description similaire - MAX17524 |
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