LM3679 Series

3MHz, 350mA Miniature Step-Down DC-DC Converter for Ultra Low Profile Applications

Catalog

3MHz, 350mA Miniature Step-Down DC-DC Converter for Ultra Low Profile Applications

Part	Outputs and Type	Outputs and Type	Utilized IC / Part	Regulator Topology	Supplied Contents	Main Purpose	Current - Output	Voltage - Output	Frequency - Switching	Voltage - Input [Min]	Voltage - Input [Max]	Board Type	Output Type	Number of Outputs	Voltage - Output (Min/Fixed)	Function	Mounting Type	Voltage - Input (Min) [Min]	Output Configuration	Operating Temperature [Min]	Operating Temperature [Max]	Topology	Package / Case	Supplier Device Package	Voltage - Input (Max) [Max]
Texas Instruments LM3679TL-1.8EV	Non-Isolated	1	LM3679	Buck	Board(s)	DC/DC Step Down	350 mA	1.8 V	3 MHz	2.5 V	5.5 V	Fully Populated
Texas Instruments LM3679UR-1.2/NOPB							350 mA		3 MHz				1.81 mOhm	1	1.2 V	Step-Down	Surface Mount	2.5 V	Positive	-30 °C	85 °C	Buck	5-XFBGA DSBGA	5-DSBGA (1.47x1.02)	5.5 V
Texas Instruments LM3679UR-1.5/NOPB							350 mA		3 MHz				1.81 mOhm	1	1.5 V	Step-Down	Surface Mount	2.5 V	Positive	-30 °C	85 °C	Buck	5-XFBGA DSBGA	5-DSBGA (1.47x1.02)	5.5 V
Texas Instruments LM3679TL-1.8/NOPB							350 mA		3 MHz				1.81 mOhm	1	1.8 V	Step-Down	Surface Mount	2.5 V	Positive	-30 °C	85 °C	Buck		5-DSBGA (1.41x1.08)	5.5 V
Texas Instruments LM3679UR-1.8/NOPB							350 mA		3 MHz				1.81 mOhm	1	1.8 V	Step-Down	Surface Mount	2.5 V	Positive	-30 °C	85 °C	Buck	5-XFBGA DSBGA	5-DSBGA (1.47x1.02)	5.5 V
Texas Instruments LM3679URX-1.8/NOPB							350 mA		3 MHz				1.81 mOhm	1	1.8 V	Step-Down	Surface Mount	2.5 V	Positive	-30 °C	85 °C	Buck	5-XFBGA DSBGA	5-DSBGA (1.47x1.02)	5.5 V
Texas Instruments LM3679URX-1.2/NOPB							350 mA		3 MHz				1.81 mOhm	1	1.2 V	Step-Down	Surface Mount	2.5 V	Positive	-30 °C	85 °C	Buck	5-XFBGA DSBGA	5-DSBGA (1.47x1.02)	5.5 V

Catalog

3MHz, 350mA Miniature Step-Down DC-DC Converter for Ultra Low Profile Applications

Key Features

• 16 µA typical quiescent current350 mA maximum load capability3 MHz PWM fixed switching frequency (typ)Automatic PFM/PWM mode switchingAvailable in 5-bump micro SMD package and UR packageInternal synchronous rectification for high efficiencyInternal soft start0.01 µA typical shutdown currentOperates from a single Li-Ion cell batteryCurrent overload and Thermal shutdown protectionThree external components required for typical applicationsLow profile solution (0.55mm max height, includes four external components)16 µA typical quiescent current350 mA maximum load capability3 MHz PWM fixed switching frequency (typ)Automatic PFM/PWM mode switchingAvailable in 5-bump micro SMD package and UR packageInternal synchronous rectification for high efficiencyInternal soft start0.01 µA typical shutdown currentOperates from a single Li-Ion cell batteryCurrent overload and Thermal shutdown protectionThree external components required for typical applicationsLow profile solution (0.55mm max height, includes four external components)

Description

The LM3679 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.5V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. The LM3679 output voltage can be configured to 1.2V, 1.5V, or 1.8V. The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed-frequency of 3 MHz (typ). PWM mode drives loads from ~ 80mA to 350mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled low), the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3679 is available in a lead-free (No PB) 5-bump micro SMD package, 0.6mm height, and in an ultra thin 0.3mm height UR package. Using the UR package along with specific external components, allows for a low profile solution size with a max height of 0.55mm. A switching frequency of 3 MHz (typ) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required. . The LM3679 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.5V to 5.5V. It provides up to 350mA load current, over the entire input voltage range. The LM3679 output voltage can be configured to 1.2V, 1.5V, or 1.8V. The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed-frequency of 3 MHz (typ). PWM mode drives loads from ~ 80mA to 350mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled low), the device turns off and reduces battery consumption to 0.01 µA (typ). The LM3679 is available in a lead-free (No PB) 5-bump micro SMD package, 0.6mm height, and in an ultra thin 0.3mm height UR package. Using the UR package along with specific external components, allows for a low profile solution size with a max height of 0.55mm. A switching frequency of 3 MHz (typ) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required. .