LMR50410

Part: LMR50410 — Texas Instruments

Type: Synchronous Buck Converter

Description: The LMR50410 is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 1-A load current with an input range of 4 V to 36 V, operating at a 700-kHz fixed switching frequency.

Operating Conditions:

• Supply voltage: 4–36 V
• Operating temperature: -40 to 150 °C
• Output voltage: 1–28 V
• Output current: 0–1 A

Absolute Maximum Ratings:

• Max supply voltage: 38 V
• Max junction temperature: 150 °C
• Max storage temperature: 150 °C

Key Specs:

• Input voltage range: 4 V to 36 V
• Continuous output current: 1 A
• Switching frequency: 700 kHz (min 600 kHz, max 800 kHz)
• Feedback voltage (VFB): 0.99 V to 1.01 V
• High-side MOSFET ON-resistance (RDS-ON-HS): 450 mΩ (TJ=25°C, VIN=12V)
• Low-side MOSFET ON-resistance (RDS-ON-LS): 240 mΩ (TJ=25°C, VIN=12V)
• Operating quiescent current (non-switching): 80 μA (PFM variant only, VEN=3.3V, VFB=1.1V)
• Minimum switch on-time: 60 ns (IOUT=1A)
• Thermal shutdown threshold: 170 °C

Features:

• Functional Safety-Capable
• Integrated synchronous rectification
• Internal compensation
• Monotonic start-up with pre-biased output
• Internal short circuit protection with hiccup mode
• Precision enable
• PFM and forced PWM (FPWM) options

Applications:

• Major appliances
• PLC, DCS, and PAC
• Smart meters
• General purpose wide VIN power supplies

Package:

• SOT-23-6 (2.90 mm × 1.60 mm)

• Functional Safety-Capable
• -Documentation available to aid functional safety system design
• Configured for rugged industrial applications
• -Input voltage range: 4 V to 36 V
• -1-A continuous output current
• -Minimum switching-on time: 60 ns
• -700-kHz fixed switching frequency
• -Junction temperature range: -40°C to 150°C
• -98% maximum duty cycle
• -Monotonic start-up with pre-biased output
• -Internal short circuit protection with hiccup mode
• -±1% tolerance voltage reference
• -Precision enable
• Small solution size and ease of use
• -Integrated synchronous rectification
• -Internal compensation for ease of use
• -SOT-23-6 package
• Pin-to-pin compatible with LMR14010Aand TPS560430
• Various options in pin-to-pin compatible package -PFM and forced PWM (FPWM) options
• Create a custom design using the LMR50410 with the WEBENCH ® Power Designer

• Major appliances
• PLC, DCS, and PAC
• Smart meters
• General purpose wide VIN power supplies

Figure 6-1. 6-Pin SOT-23-6 DBV Package (Top View)

Table 6-1. Pin Functions

• (1) A = Analog, P = Power, G = Ground.

Table 6-1. Pin Functions

Limits apply over operating junction temperature (T J ) range of -40°C to +150°C, unless otherwise stated. Minimum and Maximum limits (1) are specified through test, design or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. Unless otherwise stated, the following conditions apply: V IN = 4 V to 36 V.

Over junction temperature range of -40°C to 150°C (unless otherwise noted) (1)

Over the recommended operating junction temperature range of -40 °C to 150°C (unless otherwise noted) (1)

The value of RθJA given in this table is only valid for comparison with other packages and cannot be used for design purposes. These values were calculated in accordance with JESD 51-7, and simulated on a 4-layer JEDEC board. They do not represent the performance obtained in an actual application. For example, with a 2-layer PCB, a R θJA = 80 °C /W can be achieved. For design information see Maximum Output Current versus Ambient Temperature.

The value of RθJA given in this table is only valid for comparison with other packages and cannot be used for design purposes. These values were calculated in accordance with JESD 51-7, and simulated on a 4-layer JEDEC board. They do not represent the performance obtained in an actual application. For example, with a 2-layer PCB, a R θJA = 80 °C /W can be achieved. For design information see Maximum Output Current versus Ambient Temperature.

The LMR50410 is a step-down DC-to-DC converter. It is typically used to convert a higher input voltage to a lower output DC voltage with a maximum output current of 1 A. The following design procedure can be used to select components for the LMR50410. Alternately, the WEBENCH® software can be used to generate complete designs. When generating a design, the WEBENCH® software utilizes iterative design procedure and accesses comprehensive databases of components. Go to ti.com for more details.