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MAX17233ETI_+ Datasheet(PDF) 11 Page - Maxim Integrated Products |
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MAX17233ETI_+ Datasheet(HTML) 11 Page - Maxim Integrated Products |
11 / 24 page Pin Description (continued) PIN NAME DESCRIPTION 12 PGOOD1 Open-Drain Power-Good Output for Buck 1. PGOOD1 is low if OUT1 is more than 15% (typ) below the normal regulation point. PGOOD1 asserts low during soft-start and in shutdown. PGOOD1 becomes high impedance when OUT1 is in regulation. To obtain a logic signal, pullup PGOOD1 withanexternalresistorconnectedtoapositivevoltagelowerthan5.5V.Placeaminimumof100Ω (RPGOOD1) in series with PGOOD1. See the Voltage Monitoring section for details. 13 PGOOD2 Open-Drain Power-Good Output for Buck 2. PGOOD2 is low if OUT2 is more than 15% (typ) below the normal regulation point. PGOOD2 asserts low during soft-start and in shutdown. PGOOD2 becomes high impedance when OUT2 is in regulation. To obtain a logic signal, pullup PGOOD2 with an external resistor connected to a positive voltage lower than 5.5V. 14 FSYNC External Clock Synchronization Input. Synchronization to the controller operating frequency ratio is 1. Keep fSYNC a minimum of 10% greater than the maximum internal switching frequency for stable operation. See the Switching Frequency/External Synchronization section. 15 FOSC Frequency Setting Input. Connect a resistor from FOSC to AGND to set the switching frequency of the DC-DC converters. 16 COMP2 Buck2ErrorAmplifierOutput.ConnectanRCnetworktoCOMP2tocompensatebuck2. 17 FB2 FeedbackInputforBuck2.ConnectFB2toBIASforthe3.3Vfixedoutputortoaresistivedivider between OUT2 and GND to adjust the output voltage between 1V and 10V. In adjustable mode, FB2 regulates to 1V (typ). See the Setting the Output Voltage in Buck Converters section. 18 OUT2 Output Sense and Negative Current-Sense Input for Buck 2. When using the internal preset 3.3V feedback-divider (FB2 = BIAS), the buck uses OUT2 to sense the output voltage. Connect OUT2 to the negative terminal of the current-sense resistor. See the Current Limiting and Current-Sense Inputs and Current-Sense Measurement sections. 19 CS2 Positive Current-Sense Input for Buck 2. Connect CS2 to the positive terminal of the current-sense resistor. See the Current Limiting and Current-Sense Inputs and Current-Sense Measurement sections. 20 PGND2 Power Ground for Buck 2 21 DL2 Low-Side Gate Drive Output for Buck 2. DL2 output voltage swings from VPGND2 to VBIAS. 22 LX2 Inductor Connection for Buck 2. Connect LX2 to the switched side of the inductor. LX2 serves as the lower supply rail for the DH2 high-side gate drive. 23 DH2 High-Side Gate Drive Output for Buck 2. DH2 output voltage swings from VLX2 to VBST2. 24 BST2 Boost Capacitor Connection for High-Side Gate Voltage of Buck 2. Connect a high-voltage diode between BIAS and BST2. Connect a ceramic capacitor between BST2 and LX2. See the High-Side Gate-Driver Supply (BST_) section. 25 EN2 High-Voltage Tolerant, Active-High Digital Enable Input for Buck 2. Driving EN2 high enables buck 2. 26 EN1 High-Voltage Tolerant, Active-High Digital Enable Input for Buck 1. Driving EN1 high enables buck 1. 27 BST1 Boost Capacitor Connection for High-Side Gate Voltage of Buck 1. Connect a high-voltage diode between BIAS and BST1. Connect a ceramic capacitor between BST1 and LX1. See the High-Side Gate-Driver Supply (BST_) section. 28 DH1 High-Side Gate-Drive Output for Buck 1. DH1 output voltage swings from VLX1 to VBST1. — EP Exposed Pad. Connect the exposed pad to ground. Connecting the exposed pad to ground does not remove the requirement for proper ground connections to PGND1, PGND2, and AGND. The exposed pad is attached with epoxy to the substrate of the die, making it an excellent path to remove heat from the IC. MAX17232/MAX17233 3.5V–36V, 2.2MHz, Synchronous Dual Buck Controller with 20µA Quiescent Current www.maximintegrated.com Maxim Integrated │ 11 |
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