Specification	LM3691TLX-1.5/NOPB

Current - Output	1 A
Frequency - Switching	4 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
Package / Case	DSBGA, 6-WFBGA
Supplier Device Package	6-DSBGA (1.5x1.3)
Synchronous Rectifier	True
Topology	Buck
Voltage - Input (Max) [Max]	5.5 V
Voltage - Input (Min) [Min]	2.3 V
Voltage - Output (Min/Fixed)	1.5 V

LM3691 Series

High Accuracy, Miniature 1A, Step-Down DC-DC Converter for Portable Applications

Part	Voltage - Input (Max) [Max]	Frequency - Switching	Topology	Supplier Device Package	Output Configuration	Voltage - Output (Min/Fixed)	Operating Temperature [Min]	Operating Temperature [Max]	Number of Outputs	Voltage - Input (Min) [Min]	Current - Output	Package / Case	Output Type	Function	Mounting Type	Voltage - Output	Outputs and Type	Outputs and Type	Utilized IC / Part	Main Purpose	Voltage - Input [Min]	Voltage - Input [Max]	Regulator Topology	Supplied Contents	Board Type
Texas Instruments LM3691TLX-1.8/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	1.8 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TL-1.0/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	1 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TL-1.8EV/NOPB		4 MHz									1 A					1.8 V	Non-Isolated	1	LM3691	DC/DC Step Down	2.3 V	5.5 V	Buck	Board(s)	Fully Populated
Texas Instruments LM3691TL-0.75/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	0.75 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TL-3.3/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	3.3 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TLX-1.0/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	1 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TL-1.5/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	1.5 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TLX-1.5/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	1.5 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TL-2.5/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	2.5 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount
Texas Instruments LM3691TLX-2.5/NOPB	5.5 V	4 MHz	Buck	6-DSBGA (1.5x1.3)	Positive	2.5 V	-30 °C	85 °C	1	2.3 V	1 A	6-WFBGA DSBGA	1.81 mOhm	Step-Down	Surface Mount

Pricing

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

Distributor	Package	Quantity	$

Digikey	Tape & Reel (TR)	3000	$ 0.79
		6000	$ 0.78
		9000	$ 0.77
Texas Instruments	LARGE T&R	1	$ 1.41
		100	$ 1.08
		250	$ 0.80
		1000	$ 0.57

Description

General part information

LM3691 Series

The LM3691 step-down DC-DC converter is optimized for powering ultra-low-voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1-A load current over an input voltage range from 2.3 V to 5.5 V. There are several different fixed voltage output options available.

The LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated PWM mode and PWM automatically, depending on the load. In ECO mode, the device offers superior efficiency and very low IQunder light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load conditions and system standby.

The LM3691 is available in a 6-pin DSBGA package. Only three external surface-mount components, a1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF output capacitor, are required.

Documents

Technical documentation and resources

AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)

Application note

AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)

Application note

AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)

Application note

LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter for Portable Applications datasheet (Rev. J)

Data sheet

LM3691TLX-1.5/NOPB

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LM3691TLX-1.5/NOPB

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Technical Specifications

LM3691 Series

Pricing

Description

LM3691 Series

Documents

AN-1772 LM3691 Evaluation Board (Rev. B)

Semiconductor and IC Package Thermal Metrics (Rev. D)

AN-643 EMI/RFI Board Design (Rev. B)

Power Management Guide 2018 (Rev. R)

AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C)

AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A)

AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A)

AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A)

LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter for Portable Applications datasheet (Rev. J)

LM3691 Series