Specification	LM3673TL-1.8/NOPB

Current - Output	350 mA
Frequency - Switching	2 MHz
Function	Step-Down
Mounting Type	Surface Mount
Number of Outputs	1
Operating Temperature [Max]	85 °C
Operating Temperature [Min]	-30 °C
Output Configuration	Positive
Output Type	1.81 mOhm
Supplier Device Package	5-DSBGA (1.41x1.08)
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	5.5 V
Voltage - Input (Min) [Min]	2.7 V
Voltage - Output (Min/Fixed)	1.8 V

LM3673 Series

Part	Voltage - Output (Max) [Max]	Voltage - Input (Max) [Max]	Output Type	Number of Outputs	Voltage - Input (Min) [Min]	Function	Output Configuration	Mounting Type	Supplier Device Package	Voltage - Output (Min/Fixed)	Current - Output	Topology	Frequency - Switching	Operating Temperature [Min]	Operating Temperature [Max]	Output Type	Voltage - Output	Board Type	Voltage - Input [Min]	Voltage - Input [Max]	Utilized IC / Part	Supplied Contents	Main Purpose	Outputs and Type	Outputs and Type	Regulator Topology
Texas Instruments LM3673TL-ADJ/NOPB	3.3 V	5.5 V	Adjustable	1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.1 V	350 mA	Buck	2 MHz	-30 °C	85 °C
Texas Instruments LM3673TL-1.875/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.875 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm
Texas Instruments LM3673TL-1.5/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.5 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm
Texas Instruments LM3673TL-1.5EV											350 mA		2 MHz				1.5 V	Fully Populated	2.7 V	5.5 V	LM3673	Board(s)	DC/DC Step Down	Non-Isolated	1	Buck
Texas Instruments LM3673TL-1.2/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.2 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm
Texas Instruments LM3673TLX-1.8/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.8 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm
Texas Instruments LM3673TLX-1.5/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.5 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm
Texas Instruments LM3673TLX-ADJ/NOPB	3.3 V	5.5 V	Adjustable	1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.1 V	350 mA	Buck	2 MHz	-30 °C	85 °C
Texas Instruments LM3673TLX-1.2/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.2 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm
Texas Instruments LM3673TL-1.8/NOPB		5.5 V		1	2.7 V	Step-Down	Positive	Surface Mount	5-DSBGA (1.41x1.08)	1.8 V	350 mA	Buck	2 MHz	-30 °C	85 °C	1.81 mOhm

Pricing

Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly

Distributor	Package	Quantity	$

Digikey	Cut Tape (CT)	1	$ 1.59
		10	$ 1.42
		25	$ 1.35
		100	$ 1.11
	Digi-Reel®	1	$ 1.59
		10	$ 1.42
		25	$ 1.35
		100	$ 1.11
	Tape & Reel (TR)	250	$ 0.73
		500	$ 0.64
		1250	$ 0.59
Texas Instruments	SMALL T&R	1	$ 1.07
		100	$ 0.88
		250	$ 0.63
		1000	$ 0.48

Description

General part information

LM3673 Series

The LM3673 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7 V to 5.5 V. It provides up to 350-mA load current over the entire input voltage range. There are several different fixed voltage output options available, as well as an adjustable output voltage version ranging from 1.1 V to 3.3 V.

The device offers superior features and performance for mobile phones and similar portable systems. The LM3673 uses intelligent automatic switching between pulse width modulation (PWM) and pulse frequency modulation (PFM) for better efficiency. During PWM mode, the device operates at a fixed-frequency of2 MHz (typical). Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typical) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typical).

The LM3673 is available in a tiny 5-pin DSBGA package. A high switching frequency of 2 MHz (typical) allows the use of three tiny surface-mount components: an inductor and two ceramic capacitors.

Documents

Technical documentation and resources

LM3673 2-MHz, 350-mA Step-Down DC-DC Converter datasheet (Rev. M)

Data sheet

AN-1465 LM3673 Evaluation Board (Rev. D)

User guide