LX1675CLQ (#72283) |
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Overview
The LX1675 is a highly integrated power supply controller IC featuring three voltage mode PWM switching regulator stages with an additional onboard linear regulator driver. Two of the constant frequency PWM phases can be easily configured for a single Bi-Phase high current output or operated as two independently regulated outputs. All outputs (PWM phases and LDO) have separate, programmable soft-start sequencing. This versatility yields either three or four independently regulated outputs with full power sequencing capability giving system designers the ultimate flexibility in power supply design. Current limit for each PWM regulator is provided by monitoring the voltage drop across the lower MOSFET power stage during conduction, utilizing the Rds(on) impedance. This eliminates the need for expensive current sense resistors. Once current limit has been reached and persist for 4 clock cycles, the output is shut off and Soft Start is initialized to force a hiccup mode for protection. High current MOSFETs can be directly driven to provide an LDO output of 5A and 15A for each PWM controller. This is useful for I/O, memory, termination, and other supplies surrounding today’s micro-processor based designs. The LX1675 accepts a wide range of supply voltage ranging from 4.5V to 24V. Each PWM regulator output voltage is programmed via a simple voltage-divider network. The LX1675 design gives engineers maximum flexibility with respect to the MOSFET supply. Each phase can utilize different supply voltages for efficient use of available supply rails. Additionally, when two phases are configured in Bi-Phase output, the LoadSHARE™ topology can be programmed via inductor ESR selection. The split phase operation reduces power loss, noise due to the ESR of the input capacitors and allows for reduction in capacitance values while maximizing regulator response time. The internal reference voltage is buffered and brought out on a separate pin to be used as an external reference voltage. Features
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Package Carrier: | NULL |
Electrical Rating | Symbol | Min | Typ | Max | Unit |
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Output Voltage (V) | VO | 0.8 | 20 | V | |
Phases | Phases | 2 | Select | ||
Switching Frequency (kHz) | fs | 300 | 600 | kHz |
Environmental Rating | Symbol | Min | Typ | Max | Unit |
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Operating Temperature | TA | 85 | °C |
Undefined | Symbol | Min | Typ | Max | Unit |
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Regulated Outputs | OutR | 3 | Select |
Resources
Datasheets | |
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LX1675 Datasheet |
App Notes | |
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TN-206:Voltage-Mode, Current-Mode (and Hysteretic Control) |
Literature | |
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LX1675 Evaluation Board User Guide |
Reliability | |
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Quality & Reliability Report - Aliso Viejo, CA, USA - Garden Grove, CA, USA - San Jose, CA, USA |
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