描述 Description

The LMR36503E-Q1 is a 65V, 0.3A synchronous step-down DC/DC converter in 2mm × 2mm HotRod package. This easy-to-use converter can handle input voltage transients up to 70V, provide excellent EMI performance, and support fixed 3.3V, 5V and other adjustable output voltages.

The LMR36503E-Q1 uses peak current mode control architecture with internal compensation and maintains stable operation with minimal output capacitance. The wide input operating range of the LMR36503E-Q1 helps the device remain functional during a deep input voltage sag condition, making the device an excellent choice for automotive applications withstanding severe cold crank start impulses. The PGOOD flag in the LMR36503E-Q1 provides precise indication of the output voltage status, eliminating the requirement for an external supervisor. A seamless transition from FPWM to PFM, with an ultra-low standby quiescent current allows the LMR36503E-Q1 to support much higher system efficiency at low output loads. The MODE/SYNC pin variant helps to synchronize the LMR36503E-Q1 to an external clock. With the right resistor selection, the LMR36503E-Q1 RT pin variant can also be externally programmed to any desired switching frequency of operation. The rich feature set of the LMR36503E-Q1 is designed to simplify implementation for a wide range of automotive end equipments.

特性 Features

AEC-Q100-qualified for automotive applications:

Device temperature grade 0: –40°C to +150°C, TA



> 70% efficiency at 5mA

4μA IQ (switching) at 24VIN to 3.3VOUT (fixed output option)



Miniature design size and low component cost

2mm × 2mm HotRod? package with wettable flanks

Internal compensation



Designed for automotive applications:

Junction temperature range –40°C to +175°C

Pseudo-random spread spectrum compatible with CISPR 25 EMI standard

Wide input voltage range: 3V (falling threshold) to 65V

Adjustable and 3.3V fixed output voltage options available

Synchronizable with MODE/SYNC pin variant

Adjustable FSW: 200kHz to 2.2MHz with RT pin variant

Functional Safety-Capable

Documentation available to aid designs requiring functional safety



Pin compatible with LMR36503-Q1 (65V, 300mA)



Create a custom design using the LMR36503E-Q1 with the WEBENCH Power Designer