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MAX1858 Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX1858 Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 22 page Dual 180° Out-of-Phase Buck Controllers with Sequencing/Prebias Startup and POR ______________________________________________________________________________________ 11 VOUT1 SS1 VOUT2 SS2 DH1 DL1 DH2 DL2 UVLO A B C D E F G H I J K M L EN VL P O N MAX1858A POWER-ON-OFF SEQUENCING DEFINITIONS SYMBOL DEFINITION VL EN VOUT1 SS1 VOUT2 SS2 DH1 DL1 DH2 DL2 A B Internal 5V Linear-Regulator Output Active-High Enable Input Regulator 1 Output Voltage Regulator 1: Internal Soft-Start Input Signal into Error Amplifier Regulator 2 Output Voltage Regulator 2: Internal Soft-Start Input Signal into Error Amplifier Regulator 1: High-Side Gate-Driver Output Regulator 1: Low-Side Gate-Driver Output Regulator 2: High-Side Gate-Driver Output Regulator 2: Low-Side Gate-Driver Output VL rising while below the UVLO threshold. EN is low. VL is greater than the UVLO threshold. EN is low. SYMBOL DEFINITION D E F Normal operation VL enters UVLO. VL exits UVLO. UVLO Undervoltage threshold value is provided in the Electrical Characteristics table. EN is pulled high. DH1 and DL1 start switching. DH2 and DL2 are off. C Resumes normal operation. DH1 and DL1 start switching. DH2 and DL2 are off. EN is pulled low and then high. H G VOUT1 must reach 0V before restarting due to the cycling of the enable in region H (above). VOUT1 recovers. VOUT2 recovers. VL enters UVLO before VOUT2 fully recovers. VL exits UVLO. UVLO latches DL_ low. J K L M N O P I Exiting UVLO: DL_ remains latched low until the first fall of DH_ is detected. DL_ is high after EN is pulled low and soft-stop is complete. Figure 4. MAX1858A Detailed Power-On-Off Sequencing |
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