LMR60440中文资料Simple Switcher 3.1-V to 36-V, 4.0-A high power density, Low EMI step down converter数据手册TI规格书

描述 Description

The LMR60440 is a 3V to 36V (42V transient), 4A synchronous buck converter designed for industrial applications. The LMR60440 offers variants with spread spectrum in an ultra-compact, 2.5mm × 2mm, HotRod QFN-9 package, which reduces inductance and achieves low electromagnetic interference (EMI) performance to facilitate qualification of industrial 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 40ns 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 LMR60440 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 LMR60440 consumes only 5µA of quiescent current, which makes sure of high efficiency at all loads. Few external components are needed allowing for compact PCB layout. The LMR60440 is a part of a family of pin compatible devices ranging in current levels from 0.6A to 6A.

特性 Features

Functional Safety-Capable

Documentation available to aid functional safety system design



Wide operating input voltage: 3V to 36V (42V absolute maximum)

Ultra-low quiescent current

Shutdown current: 0.65µA

No load standby current: 5µA



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

Spread spectrum options available



Programmable switching frequency from 200kHz – 2.2MHz

FPWM, PFM, or external frequency synchronization available

Designed for scalable power supplies

Pin compatible with LMR60406, LMR60410, LMR60420, and LMR60430



Power-Good output for power sequencing