LMR14030SDDAR
Synchronous Buck ConverterThe LMR14030SDDAR is a synchronous buck converter from Texas Instruments. View the full LMR14030SDDAR datasheet below including key specifications, electrical characteristics, absolute maximum ratings.
LMR14030SDDAR shares its datasheet with LMR14030, whose page lists every part number it covers.
Official LMR14030SDDAR datasheet (PDF) — the source this page was extracted from.
LMR14030SDDAR Key Specifications
| Parameter | Value |
|---|---|
| Output Current | 3.5A |
| Switching Frequency | 200kHz ~ 2.5MHz |
| Function | Step-Down |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Output Configuration | Positive |
| Output Type | Adjustable |
| Package / Case | 8-PowerSOIC (0.154\", 3.90mm Width) |
| Supplier Device Package | 8-SO PowerPad |
| Synchronous Rectifier | No |
| Topology | Buck |
| Input Voltage (Max) | 40V |
| Input Voltage (Min) | 4V |
| Output Voltage (Max) | 28V |
| Output Voltage | 0.8V |
LMR14030SDDAR Overview
Part: LMR14030SDDAR — Texas Instruments
Type: Step-Down (Buck) Converter with Integrated High-Side MOSFET
Description: 4–40 V input, 3.5 A step-down converter with 90 mΩ (typ) integrated high-side MOSFET, 40 μA typical quiescent current, and adjustable switching frequency from 200 kHz to 2.5 MHz.
Operating Conditions:
- Supply voltage (VIN): 4–40 V
- Operating junction temperature: -40 to 125 °C
- Output voltage range: 0.8–28 V
- Switching frequency: 200–2500 kHz (RT mode), 250–2300 kHz (SYNC mode)
Absolute Maximum Ratings:
- Max input voltage (VIN, EN to GND): 44 V
- BOOT to GND: 49 V
- SW to GND: -3 to 44 V
- Max junction temperature: 150 °C
- Storage temperature: -65 to 150 °C
Key Specs:
- Shutdown supply current: 1.0 μA typ, 3.0 μA max (VEN = 0 V, TA = 25 °C)
- Operating quiescent current (non-switching): 40 μA typ (VFB = 1.0 V, TA = 25 °C)
- Feedback voltage: 0.750 V typ; 0.735–0.765 V over TJ = -40 to 125 °C
- High-side MOSFET RDS(on): 90 mΩ typ, 180 mΩ max (VIN = 12 V)
- Current limit: 4.4 / 5.5 / 6.6 A (min/typ/max) (VIN = 12 V, TA = 25 °C, open loop)
- UVLO rising threshold: 3.5 / 3.7 / 3.9 V (min/typ/max), 285 mV hysteresis typ
- EN threshold: 1.05 / 1.20 / 1.38 V (min/typ/max)
- Minimum controllable on-time: 75 ns typ (VIN = 12 V, ILoad = 1 A); maximum duty cycle 97% typ (fSW = 200 kHz)
- Thermal shutdown: 170 °C typ, 12 °C hysteresis
Features:
- 4 V to 40 V input range
- 3.5 A continuous output current
- Ultra-low 40 μA operating quiescent current
- Current mode control with internal compensation
- Adjustable switching frequency of 200 kHz to 2.5 MHz
- Frequency synchronization to external clock
- High duty cycle operation supported
- Precision enable input
- External soft start
- Thermal, overvoltage, and short-circuit protection with cycle-by-cycle current limit
Applications:
- Automotive battery regulation
- Industrial power supplies
- Telecom and datacom systems
- Battery powered systems
Package:
- DDA HSOIC-8 with PowerPAD (4.9 mm × 6 mm)
LMR14030SDDAR Features
- 4V to 40V input range
- 3.5A continuous output current
- Ultra-low 40μA operating quiescent current
- 90mΩ high-side MOSFET
- 75ns minimum switch-on time
- Current mode control
- Adjustable switching frequency from 200kHz to 2.5MHz
- Frequency synchronization to external clock
- Internal compensation for ease of use
- High duty cycle operation supported
- Precision enable input
- 1μA shutdown current
- External soft start
- Thermal, overvoltage, and short protection
- 8-pin HSOIC with PowerPAD ™ package
LMR14030SDDAR Applications
- Automotive battery regulation
- Industrial power supplies
- Telecom and datacom systems
- Battery powered system
LMR14030SDDAR Pin Configuration
Figure 4-1. DDA HSOIC 8-Pin (Top View)
Table 4-1. Pin Functions
| PIN - NAME | PIN - NO. | TYPE (1) | DESCRIPTION |
|---|---|---|---|
| BOOT | 1 | O | Bootstrap capacitor connection for high-side MOSFET driver. Connect a high quality 0.1 μF 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
LMR14030SDDAR 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 T J = 25°C, and are provided for reference purposes only. Unless otherwise specified, the following conditions apply: V IN = 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 | Undervoltage 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 | 1.0 | 3.0 | μA | |
| I Q | Operating quiescent current (non- switching) | V FB = 1.0 V, T A = 25°C | 40 | μA | ||
| ENABLE (EN PIN) | ENABLE (EN PIN) | |||||
| V EN_TH | EN threshold voltage | 1.05 | 1.20 | 1.38 | V | |
| I EN_PIN | EN PIN current | Enable threshold +50 mV | -4.6 | μA | ||
| I EN_HYS | EN hysteresis current | Enable threshold -50 mV | -1.0 -3.6 | μA | ||
| EXTERNAL SOFT-START | EXTERNAL SOFT-START | |||||
| I SS | SS pin current | T A = 25°C | 3 | μA | ||
| VOLTAGE REFERENCE (FB PIN) | VOLTAGE REFERENCE (FB PIN) | |||||
| V FB | Feedback voltage | T J = 25°C | 0.744 | 0.750 | 0.756 | V |
| T J = -40°C to 125°C | 0.735 | 0.750 | 0.765 | V | ||
| HIGH-SIDE MOSFET | HIGH-SIDE MOSFET | |||||
| R DS_ON | On-resistance | V IN = 12 V | 90 | 180 | mΩ | |
| 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 |
LMR14030SDDAR 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 | 5.5 | V |
| Input voltages | RT/SYNC to GND | -0.3 | 3.6 | V |
| Output voltages | BOOT to SW | 5.5 | V | |
| Output voltages | SW to GND | -3 | 44 | V |
| T J | Junction temperature | -40 | 150 | °C |
| T stg | Storage temperature | -65 | 150 | °C |
LMR14030SDDAR 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 |
LMR14030SDDAR Thermal Information
| THERMAL METRIC (1) | DDA (HSOIC) 8 PINS | UNIT | |
|---|---|---|---|
| R θJA | Junction-to-ambient thermal resistance | 43.2 | °C/W |
| ψ JT | Junction-to-top characterization parameter | 5.2 | °C/W |
| ψ JB | Junction-to-board characterization parameter | 16.4 | °C/W |
| R θJC(top) | Junction-to-case (top) thermal resistance | 52.1 | °C/W |
| R θJC(bot) | Junction-to-case (bottom) thermal resistance | 7.8 | °C/W |
| R θJB | Junction-to-board thermal resistance | 16.4 | °C/W |
LMR14030SDDAR Typical Application
The LMR14030 is a step down DC-to-DC regulator. The device 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.
LMR14030SDDAR Package Information
| PART NUMBER | PACKAGE (1) | PACKAGE SIZE (2) |
|---|---|---|
| LMR14030SDDA | DDA (HSOIC, 8) | 4.9mm × 6mm |
- (1) For more information, see Section 10.
- (2) The package size (length × width) is a nominal value and includes pins, where applicable.
space
Efficiency vs Output Current
Variants on the same datasheet
These parts have exact links to the same datasheet. They are candidates to compare, not verified drop-in replacements; check package, pinout and electrical limits.
| Part Number | Manufacturer | Package |
|---|---|---|
| LMR14030 | Texas Instruments | HSOIC-8 |
| LMR14030SDDA | Texas Instruments | HSOIC-8 |
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