LMR14030
LMR14030 SIMPLE SWITCHER® 40V 3.5A、2.2MHz 降压转换器,具有 40μA I<sup>Q</sup>
The LMR14030 is an electronic component from Texas Instruments. LMR14030 SIMPLE SWITCHER® 40V 3.5A、2.2MHz 降压转换器,具有 40μA I<sup>Q</sup>. View the full LMR14030 datasheet below including electrical characteristics, absolute maximum ratings.
Manufacturer
Texas Instruments
Category
Integrated CircuitsOverview
Part: LMR14030 from Texas Instruments
Type: Synchronous Buck Converter
Key Specs:
- Input voltage range: 4V to 40V
- Continuous output current: 3.5A
- Ultra-low operating quiescent current: 40μA
- High-side MOSFET resistance: 90mΩ
- Minimum on-time: 75ns
- Adjustable switching frequency range: 200kHz to 2.5MHz
- Shutdown current: 1μA
Features:
- Integrated high-side MOSFET
- Current mode control
- External clock synchronization
- Internal compensation
- Supports high duty cycle operation
- Precision enable pin
- Cycle-by-cycle current limit protection
- Thermal protection
- Overvoltage protection
- Short-circuit protection
- External soft-start
Applications:
- Automotive battery regulation
- Industrial power supplies
- Telecom and data communication systems
- Battery-powered systems
Package:
- 8-pin HSOIC PowerPAD™ package
Pin Configuration
Pin Functions
| PIN | NO. | TYPE (1) | DESCRIPTION |
|---|---|---|---|
| NAME | |||
| 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 CIN. Path from VIN pin to high frequency bypass CIN 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 VOUT. 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. |
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 | TEST CONDITION | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| POWER SUPPLY (VIN PIN) | ||||||
| VIN | Operation input voltage | 4 | 40 | V | ||
| UVLO | Under voltage lockout thresholds | Rising threshold Hysteresis | 3.5 | 3.7 285 | 3.9 | V mV |
| ISHDN | Shutdown supply current | VEN = 0 V, TA = 25°C, 4.0 V ≤ VIN ≤ 40 V | 1.0 | 3.0 | μA | |
| IQ | Operating quiescent current (non- switching) | VFB = 1.0 V, TA = 25°C | 40 | μA | ||
| ENABLE (EN PIN) | ||||||
| VEN_TH | EN Threshold Voltage | 1.05 | 1.20 | 1.38 | V | |
| IEN_PIN | EN PIN current | Enable threshold +50 mV Enable threshold -50 mV | -4.6 -1.0 | μA | ||
| IEN_HYS | EN hysteresis current | -3.6 | μA | |||
| EXTERNAL SOFT-START | ||||||
| ISS | SS pin current | TA = 25°C | 3 | μA | ||
| VOLTAGE REFERENCE (FB PIN) | ||||||
| VFB | Feedback voltage | TJ = 25°C | 0.744 | 0.750 | 0.756 | V |
| TJ = -40°C to 125°C | 0.735 | 0.750 | 0.765 | V | ||
| HIGH-SIDE MOSFET | ||||||
| RDS_ON | On-resistance | VIN = 12 V, BOOT to SW = 5.8 V | 90 | 180 | mΩ | |
| ILIMT | Current limit | VIN = 12 V, TA = 25°C, Open Loop | 4.4 | 5.5 | 6.6 | A |
| THERMAL PERFORMANCE | ||||||
| TSHDN | Thermal shutdown threshold | 170 | °C | |||
| THYS | Hysteresis | 12 | °C |
7.6 Switching Characteristics
over operating free-air temperature range (unless otherwise noted)
| PARAMETER | TEST CONDITION | MIN | TYP | MAX | UNIT | |
|---|---|---|---|---|---|---|
| fSW | Switching frequency | RT = 49.9 kΩ, 1% accuracy | 400 | 500 | 600 | kHz |
| VSYNC_HI | SYNC clock high level threshold | 1.7 | V | |||
| VSYNC_LO | SYNC clock low level threshold | 0.5 | V | |||
| TSYNC_MIN | Minimum SYNC input pulse width | Measured at 500 kHz, VSYNC_HI > 3 V, VSYNC_LO < 0.3 V | 30 | ns | ||
| TLOCK_IN | PLL lock in time | Measured at 500 kHz | 100 | μs | ||
| TON_MIN | Minimum controllable on time | VIN = 12 V, BOOT to SW = 5.8 V, ILoad = 1 A | 75 | ns | ||
| DMAX | Maximum duty cycle | fSW = 200 kHz | 97 | % |
ZHCSDJ7A –FEBRUARY 2015–REVISED APRIL 2015 www.ti.com.cn
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 | |
| BOOT to GND | -0.3 | 49 | V | |
| SS to GND | -0.3 | 5 | ||
| FB to GND | -0.3 | 7 | ||
| RT/SYNC to GND | -0.3 | 3.6 | ||
| Output Voltages | BOOT to SW | 6.5 | V | |
| SW to GND | -3 | 44 | V | |
| TJ | Junction temperature | -40 | 150 | °C |
| Tstg | Storage temperature | -65 | 150 | °C |
Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
| MIN | MAX | UNIT | ||
|---|---|---|---|---|
| VIN | 4 | 40 | ||
| VOUT | 0.8 | 28 | ||
| Buck Regulator | BOOT | 45 | V | |
| SW | -1 | 40 | ||
| FB | 0 | 5 | ||
| EN | 0 | 40 | ||
| Control | RT/SYNC | 0 | 3.3 | V |
| SS | 0 | 3 | ||
| Switching frequency range at RT mode | 200 | 2500 | kHz | |
| Frequency | Switching frequency range at SYNC mode | 250 | 2300 | kHz |
| Temperature | Operating junction temperature, TJ | -40 | 125 | °C |
7.4 Thermal Information
| THERMAL METRIC(1) | DDA | UNIT | |
|---|---|---|---|
| 8 PINS | |||
| RθJA | Junction-to-ambient thermal resistance | 42.5 | °C/W |
| ψJT | Junction-to-top characterization parameter | 9.9 | °C/W |
| ψJB | Junction-to-board characterization parameter | 25.4 | °C/W |
| RθJC(top) | Junction-to-case (top) thermal resistance | 56.1 | °C/W |
| RθJC(bot) | Junction-to-case |
Thermal Information
| THERMAL METRIC(1) | DDA | UNIT | |
|---|---|---|---|
| 8 PINS | |||
| RθJA | Junction-to-ambient thermal resistance | 42.5 | °C/W |
| ψJT | Junction-to-top characterization parameter | 9.9 | °C/W |
| ψJB | Junction-to-board characterization parameter | 25.4 | °C/W |
| RθJC(top) | Junction-to-case (top) thermal resistance | 56.1 | °C/W |
| RθJC(bot) | Junction-to-case |
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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