LMR14030SDDAR

LMR14030 SIMPLE SWITCHER® 40V 3.5A、2.2MHz 降压转换器,具有 40μA I<sup>Q</sup>

Synchronous Buck Converter

The LMR14030SDDAR is a synchronous buck converter 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 LMR14030SDDAR datasheet below including key specifications, pinout, 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 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

LMR14030SDDAR – 8-PowerSOIC Pinout

Pin	Name	Type	Description
1	BOOT	O	Bootstrap capacitor connection for high-side MOSFET driver. Connect a high quality 0.1 μF capacitor from BOOT to SW.
2	VIN	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.
3	EN	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.
4	RT/SYNC	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.
5	FB	I	Feedback input pin, connect to the feedback divider to set VOUT. Do not short this pin to ground during operation.
6	SS	O	Soft-start control pin. Connect to a capacitor to set soft-start time.
7	GND	G	System ground pin.
8	SW	O	Switching output of the regulator. Internally connected to high-side power MOSFET. Connect to power inductor.
9	Thermal Pad	G	Major heat dissipation path of the die. Must be connected to ground plane on PCB.

Notes

Pin 9 (Thermal Pad) is the exposed die pad on the PowerSOIC package and must be connected to the ground plane for proper heat dissipation.
RT/SYNC (Pin 4) is a dual-function pin: operates as a resistor-timing input in frequency-programming mode, or as a high-impedance clock input when pulled above the PLL upper threshold.

Electrical Characteristics

Limits apply over the recommended operating junction temperature (T^J ) 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: 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		%

LMR14030

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
LMR14030	Texas Instruments	—
LMR14030SDDA	Texas Instruments	—

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