1 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

2 Applications

• High-end audio power supply

• Voltage stabilizer module

• Start-stop application

3 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.