LMR14030SDDAR

Synchronous Buck Converter

The LMR14030SDDAR is a synchronous buck converter from Texas Instruments. View the full LMR14030SDDAR datasheet below including key specifications, electrical characteristics, absolute maximum ratings.

Manufacturer

Texas Instruments

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

Overview

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
LMR14030	Texas Instruments	—
LMR14030SDDA	Texas Instruments	—

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