LMR14030
The LMR14030 is an electronic component from Texas Instruments. View the full LMR14030 datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Integrated CircuitsOverview
Part: LMR14030 — Texas Instruments
Type: Synchronous Buck Converter
Description: The LMR14030 is a 40V, 3.5A synchronous buck converter with an integrated high-side MOSFET, featuring a 4V to 40V input voltage range, 40μA quiescent current, and an adjustable switching frequency from 200kHz to 2.5MHz.
Operating Conditions:
- Supply voltage: 4V to 40V
- Operating junction temperature: -40 to 125 °C
- Output voltage: 0.8V to 28V
- Switching frequency range: 200 kHz to 2.5 MHz (RT mode), 250 kHz to 2.3 MHz (SYNC mode)
Absolute Maximum Ratings:
- Max supply voltage (VIN, EN to GND): 44 V
- Max junction temperature: 150 °C
- Max storage temperature: 150 °C
Key Specs:
- Continuous output current: 3.5 A
- Quiescent current (non-switching): 40 μA (typ) at VFB = 1.0 V, TA = 25°C
- Shutdown supply current: 1 μA (typ) at VEN = 0 V, TA = 25°C
- High-side MOSFET on-resistance: 90 mΩ (typ) at VIN = 12 V
- Minimum controllable on time: 75 ns (typ) at VIN = 12 V
- Feedback voltage: 0.75 V (typ) at TJ = 25°C
- Current limit: 5.5 A (typ) at VIN = 12 V, TA = 25°C
- Thermal shutdown threshold: 170 °C (typ)
Features:
- 90mΩ high-side MOSFET
- Current mode control
- Adjustable switching frequency
- External clock synchronization
- Internal compensation
- High duty cycle operation support
- Precision enable pin
- External soft-start
- Thermal, overvoltage, and short-circuit protection
Applications:
- Automotive battery regulation
- Industrial power supplies
- Telecom and datacom systems
- Battery powered systems
Package:
- HSOIC-8 (4.89mm x 3.90mm)
Pin Configuration
Pin Functions
Pin Functions
| PIN | PIN | TYPE (1) | DESCRIPTION |
|---|---|---|---|
| NAME | NO. | TYPE (1) | DESCRIPTION |
| BOOT | 1 | O | Bootstrap capacitor connection for high-side MOSFET driver. Connect a high quality 0.1 μ F capacitor from BOOT to SW. |
| VIN | 2 | I | Connect to power supply and bypass capacitors C IN . Path from VIN pin to high frequency bypass C IN and GND must be as short as possible. |
| EN | 3 | I | Enable pin, with internal pull-up current source. Pull below 1.2 V to disable. Float or connect to VIN to enable. Adjust the input under voltage lockout with two resistors. See the Enable and Adjusting Under voltage lockout section. |
| RT/SYNC | 4 | I | Resistor Timing or External Clock input. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the operating mode returns to frequency programming by resistor. |
| FB | 5 | I | Feedback input pin, connect to the feedback divider to set V OUT . Do not short this pin to ground during operation. |
| SS | 6 | O | Soft-start control pin. Connect to a capacitor to set soft-start time. |
| GND | 7 | G | System ground pin. |
| SW | 8 | O | Switching output of the regulator. Internally connected to high-side power MOSFET. Connect to power inductor. |
| Thermal Pad | 9 | G | Major heat dissipation path of the die. Must be connected to ground plane on PCB. |
(1) I = Input, O = Output, G = Ground
Electrical Characteristics
Limits apply over the recommended operating junction temperature (TJ) range of -40°C to +125°C, unless otherwise stated. Minimum and Maximum limits 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 specified, the following conditions apply: VIN = 4.0 V to 40 V
| PARAMETER | PARAMETER | TEST CONDITION | MIN | TYP | MAX | UNIT |
|---|---|---|---|---|---|---|
| POWER SUPPLY (VIN PIN) | POWER SUPPLY (VIN PIN) | |||||
| V IN | Operation input voltage | 4 | 40 | V | ||
| UVLO | Under voltage lockout thresholds | Rising threshold Hysteresis | 3.5 | 3.7 285 | 3.9 | V mV |
| I SHDN | Shutdown supply current | V EN = 0 V, T A = 25°C, 4.0 V ≤ V IN ≤ 40 | 1 | 3 | μ A | |
| I Q | Operating quiescent current (non- switching) | V FB = 1.0 V, T A = 25°C | 40 | μ A | ||
| ENABLE (EN PIN) | ENABLE (EN PIN) | |||||
| V EN_TH | EN Threshold Voltage | 1.05 | 1.2 | 1.38 | V | |
| I EN_PIN | EN PIN current | Enable threshold +50 mV Enable threshold -50 mV | -4.6 -1 | μ A μ A | ||
| I EN_HYS | EN hysteresis current | -3.6 | ||||
| EXTERNAL SOFT-START | EXTERNAL SOFT-START | |||||
| I SS | SS pin current | T A = 25°C | 3 | μ A | ||
| VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | |||||
| V FB | Feedback voltage | T J = 25°C | 0.744 | 0.75 | 0.756 | V |
| T J = -40°C to 125°C | 0.735 | 0.75 | 0.765 | V | ||
| HIGH-SIDE MOSFET | HIGH-SIDE MOSFET | |||||
| R DS_ON | On-resistance | V IN = 12 V, BOOT to SW = 5.8 V | 90 | 180 | m Ω | |
| High-side MOSFET CURRENT LIMIT | High-side MOSFET CURRENT LIMIT | |||||
| I LIMT | Current limit | V IN = 12 V, T A = 25°C, Open Loop | 4.4 | 5.5 | 6.6 | A |
| THERMAL PERFORMANCE | THERMAL PERFORMANCE | |||||
| T SHDN | Thermal shutdown threshold | 170 | °C | |||
| T HYS | Hysteresis | 12 | °C |
Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Input Voltages | VIN, EN to GND | -0.3 | 44 | V |
| Input Voltages | BOOT to GND | -0.3 | 49 | V |
| Input Voltages | SS to GND | -0.3 | 5 | V |
| Input Voltages | FB to GND | -0.3 | 7 | V |
| Input Voltages | RT/SYNC to GND | -0.3 | 3.6 | V |
| Output Voltages | BOOT to SW | 6.5 | V | |
| Output Voltages | SW to GND | -3 | 44 | V |
| T J | Junction temperature | -40 | 150 | °C |
| T stg | Storage temperature | -65 | 150 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| Buck Regulator | VIN | 4 | 40 | V |
| Buck Regulator | VOUT | 0.8 | 28 | V |
| Buck Regulator | BOOT | 45 | V | |
| Buck Regulator | SW | -1 | 40 | V |
| Buck Regulator | FB | 0 | 5 | V |
| Control | EN | 0 | 40 | V |
| Control | RT/SYNC | 0 | 3.3 | V |
| Control | SS | 0 | 3 | V |
| Frequency | Switching frequency range at RT mode | 200 | 2500 | kHz |
| Frequency | Switching frequency range at SYNC mode | 250 | 2300 | kHz |
| Temperature | Operating junction temperature, T J | -40 | 125 | °C |
Thermal Information
| THERMAL METRIC (1) | DDA 8 PINS | UNIT | |
|---|---|---|---|
| R θ JA | Junction-to-ambient thermal resistance | 42.5 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 9.9 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 25.4 | °C/W |
| R θ JC(top) | Junction-to-case (top) thermal resistance | 56.1 | °C/W |
| R θ JC(bot) | Junction-to-case (bottom) thermal resistance | 3.8 | °C/W |
| R θ JB | Junction-to-board thermal resistance | 25.5 | °C/W |
Typical Application
The LMR14030 is a step down DC-to-DC regulator. It is typically used to convert a higher DC voltage to a lower DC voltage with a maximum output current of 3.5 A. The following design procedure can be used to select components for the LMR14030. This section presents a simplified discussion of the design process.
Related Variants
The following components are covered by the same datasheet.
| Part Number | Manufacturer | Package |
|---|---|---|
| LMR14030SDDA | Texas Instruments | — |
| LMR14030SDDAR | Texas Instruments | 8-PowerSOIC (0.154", 3.90mm Width) |
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