1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• AEC-Q100 qualified for automotive applications

– Device temperature grade 1: –40°C to 125°C

ambient operating temperature range

• Wide operating input voltage: 3V to 36V (42V

absolute maximum)

• Pin programmable output voltage options available

in fixed 3.3V/ADJ and 5V/ADJ

– Adjustable output voltage range from 1V to 20V

• Low minimum tON (30ns typical)

• Optimized for low electromagnetic interference

(EMI) requirements:

– Low inductance HotRod™ QFN package

– Advanced spread spectrum options available

• Programmable switching frequency from 200kHz –

2.2MHz

• FPWM, PFM, or external frequency

synchronization available

• Ultra-low quiescent current

– Shutdown current: 0.65μA

– Standby current: 5μA

• Designed for scalable power supplies

– Pin compatible with LMR60410-Q1,

LMR60420-Q1, LMR60430-Q1, and

LMR60440-Q1

• Power-Good output for power sequencing

2 Applications

• Automotive infotainment and cluster

• Automotive driver assistance systems

• Automotive body applications

3 Description

The LMR60406-Q1 is a 3V to 36V (42V transient),

0.6A, synchronous buck converter designed for

automotive applications. The LMR60406-Q1 offers

variants with spread spectrum in an ultra-compact,

2.5mm × 2mm, HotRod QFN-9 package, with

wettable flanks available, which reduces inductance

and achieves low electromagnetic interference (EMI)

performance to facilitate qualification of automotive

and other noise-sensitive designs. All device variants

are capable of output voltages ranging from 1V

to 20V by including a resistor divider between the

output voltage node, feedback, and ground. Each

variant of the device is also capable of delivering

a fixed output voltage by connecting the output

voltage node directly to the feedback pin. The Device

Comparison Table provides details on the fixed output

voltage options. The current-mode control architecture

with 30ns (typical) minimum on-time allows high

conversion ratios at high frequencies, easy loop

compensation, fast transient response, and excellent

load and line regulation. An open drain power-good

output facilitates power sequencing requirements.

The MODE/SYNC pin of the LMR60406-Q1 allows

the user to select between modes of operation.

Forced pulse width modulation (FPWM) mode results

in constant switching frequency across load while

auto mode allows for seamless transitions between

pulse width modulation (PWM) and pulse frequency

modulation (PFM) switching. In auto mode, the

LMR60406-Q1 consumes only 5μA of quiescent

current which facilitates high efficiency at all loads.

Few external components are needed allowing for

compact PCB layout. The LMR60406-Q1 is a part of

a family of pin compatible devices ranging in current

levels from 0.6A to 6A.