LMG5126数据手册TI中文资料规格书

描述 Description

The LMG5126 is a stackable multiphase synchronous boost converter. The device provides a regulated output voltage for lower or equal input voltage also supporting VI to VOUT bypass mode to save power. Up to 4 devices can be stacked with or without external clock.

VOUT can be dynamically programmed using the digital or analog ATRK/DTRK function. VI can be as low as 2.5V after startup as the internal VCC supply is automatically switched from VBIAS to VOUT for VBIAS < 6.5V. The fixed switching frequency is set between 300kHz and 2.5MHz via a resistor on the RT-pin or the SYNCIN clock. The switching modes FPWM or Diode emulation can be changed during operation.

The implemented protections peak current limit, average input current limit, average inductor current monitor, over- and undervoltage protection or the thermal shutdown protect the device and the application.

特性 Features

• Input voltage 6.5V to 42V
• Minimum 2.5V for V(BIAS) ≥ 6.5V or VOUT ≥ 6V

• Output Voltage 6V to 60V
• 2% accuracy, internal feedback resistors
• Bypass operation for VI > VOUT
• Boot refresh out of audio >20kHz

• Dynamic output voltage tracking
• Digital PWM tracking (DTRK)
• Analog tracking (ATRK)

• Over voltage protection (65V, 50V, 35V, 25V)

• Low shutdown ISD of 50µA typ. (200uA max.)
• Low operating IQ of 1.1mA typ. (2.5mA max.)
• Stacking with interleaved multiphase operation
• Up to 4-devices without external clock

• Switching frequency from 300kHz to 2.5MHz
• Syncronization to external clock (SYNCIN)
• Spread Spectrum (DRSS)

• Dynamically selectable switching modes (FPWM, Diode emulation)
• Current sense resistor or DCR sensing
• Average inductor current monitor
• Average input current limit
• Selectable current limit (30mV or 60mV)
• Selectable delay time (DLY)
• Power good indicator
• Programmable VI undervoltage lockout (UVLO)
• Lead-less RLF-22 package with wettable flanks