LMR51610

Part: LMR51606, LMR51610 — Texas Instruments

Type: Synchronous Buck Converter

Description: The LMR516xx is a wide-VIN, easy-to-use synchronous buck converter capable of driving up to 0.6-A or 1-A load current, with a 4-V to 65-V input range and fixed 400-kHz or 1.1-MHz switching frequency, offered in a SOT-23 package.

Operating Conditions:

• Supply voltage: 4–65 V
• Operating temperature: -40 to +150 °C (junction)
• Output voltage: 0.8–28 V
• Output current: up to 0.6 A (LMR51606), up to 1 A (LMR51610)

Absolute Maximum Ratings:

• Max supply voltage (VIN to GND): 70 V
• Max junction temperature: 150 °C
• Max storage temperature: 150 °C

Key Specs:

• VIN quiescent current (FPWM): 420 μA (typ, V EN = 3 V)
• VIN quiescent current (PFM, non-switching): 26.5 μA (typ, V EN = 3 V)
• Reference voltage (Vfb): 0.788 V (min), 0.8 V (typ), 0.812 V (max)
• Switching frequency ("X" Version): 340 kHz (min), 400 kHz (typ), 460 kHz (max)
• Switching frequency ("Y" Version): 0.935 MHz (min), 1.1 MHz (typ), 1.265 MHz (max)
• High-side MOSFET on-resistance: 0.7 Ω (typ, V IN = 12 V, T J = 25°C)
• Low-side MOSFET on-resistance: 0.36 Ω (typ, V IN = 12 V, T J = 25°C)
• Minimum ON pulse width: 80 ns (typ, V IN = 12 V, I OUT = 0.1A)
• Thermal shutdown threshold: 165 °C (typ, temperature rising)

Features:

• Functional Safety-Capable
• Input transient protection up to 70-V
• 80-ns minimum switching on time
• 98% maximum duty cycle
• Monotonic start-up with pre-biased output
• Short-circuit protection with hiccup mode
• Precision enable
• Integrated synchronous rectification
• Internal compensation for ease of use
• PFM and forced PWM (FPWM) options

Applications:

• Major appliances
• PLC, DCS, and PAC
• Smart meters
• Power delivery

Package:

• DBV (SOT-23, 6) - 2.90 mm × 2.80 mm

• Functional Safety-Capable
• -Documentation available to aid functional safety system design
• Configured for rugged industrial applications
• -4-V to 65-V input voltage range
• -Input transient protection up to 70-V
• -0.6-A/1-A continuous output current
• -80-ns minimum switching on time
• -Fixed 400-kHz and 1.1-MHz switching frequency
• --40°C to 150°C junction temperature range
• -98% maximum duty cycle
• -Monotonic start-up with pre-biased output
• -Short-circuit protection with hiccup mode
• -Precision enable
• -±1.5% tolerance voltage reference
• Small design size and ease of use
• -Integrated synchronous rectification
• -Internal compensation for ease of use
• -SOT-23 package
• Various options in pin-to-pin compatible package
• -PFM and forced PWM (FPWM) options
• Pin-to-pin compatible with the LMR16006, LV2862, LMR50410, TPS560430, LMR54406, and LMR54410
• Create a custom design using the LMR516xx with the WEBENCH® Power Designer

• Major appliances
• PLC, DCS, and PAC
• Smart meters
• Power delivery

Simplified Schematic

Simplified Schematic

Figure 5-1. 6-Pin SOT-23 DBV Package (Top View)

Table 5-1. Pin Functions

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

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 s apply: VIN = 4 V to 65 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)

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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 = 95 °C /W can be achieved. For design information, see Maximum Output Current Versus Ambient Temperature.

The LMR516xx is a step-down DC-to-DC converter. The LMR51610 is typically used to convert a higher input voltage to a lower output DC voltage with a maximum output current of 1 A. The LMR51606 is typically used to convert a higher input voltage to a lower output DC voltage with a maximum output current of 0.6 A. The following design procedure can be used to select components for the LMR516xx.