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LM2612 Product Folder

400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits

Generic P/N 2612

Parametric Table

Temperature Min (deg C)	-30, 25
Temperature Max (deg C)	85
Multiple Output Capability	No
On/Off Pin	Yes
Error Flag	No
InputMin Voltage (Volt)	2.80
InputMax Voltage (Volt)	5.50
Output Current (mA)	400, 300
Output Voltage (Volt)	-
Adjustable Output	Yes

Output Range	1.05V, 1.3V, 1.5V, 1.8V
Switching Frequency (Hz)	600000
Adj Switch Frequency	Yes
Sync Pin	Yes
Efficiency (%)	91
Flyback	No
Inverting	No
Step-Up	No
Step-Down	Yes
RegType	Switching Regulator

Datasheet

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
LM2612 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits	3405 Kbytes	21-Nov-03	View Online	Download	Receive via Email
LM2612 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits (JAPANESE)	2898 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Status

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking

Type

Pins

MSL/Lead-Free Availability

Lead
Time

Qty

SPICE

IBIS

Qty

$US each

LM2612ABP

microSMD

Status

Full production

N/A

1K+

$1.40

reel
of
250

XYTT
I S45A

7-9 weeks

20000

LM2612BBP

microSMD

Status

Full production

N/A

1K+

$1.20

reel
of
250

XYTT
I S45B

7-9 weeks

20000

LM2612ABPX

microSMD

Status

Full production

N/A

1K+

$1.40

reel
of
3000

XYTT
I S45A

8-10 weeks

100000

LM2612BBPX

microSMD

Status

Full production

N/A

1K+

$1.20

reel
of
3000

XYTT
I S45B

7-9 weeks

20000

The LM2612 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Lithium-Ion cell. It provides up to 400mA (300mA for B grade), over an input voltage range of 2.8V to 5.5V. Pin programmable output voltages of 1.05V, 1.3V, 1.5V or 1.8V allow adjustment for MPU voltage options without board redesign or external feedback resistors.

The device has three pin-selectable modes for maximizing battery life in mobile phones and similar portable applications. Low-noise PWM mode offers 600kHz fixed-frequency operation to reduce interference in RF and data acquisition applications during full-power operation. In PWM mode, internal synchronous rectification provides high efficiency (91% typ. at 1.8V_OUT). A SYNC input allows synchronizing the switching frequency in a range of 500kHz to 1MHz to avoid noise from intermodulation with system frequencies. Low-current hysteretic PFM mode reduces quiescent current to 150 µA (typ.) during system standby. Shutdown mode turns the device off and reduces battery consumption to 0.1µA (typ.). Additional features include soft start and current overload protection.

The LM2612 is available in a 10 pin micro SMD packge. This package uses National's wafer level chip-scale micro SMD technology and offers the smallest possible size. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.

Features

Sub-miniature 10-pin micro SMD package
Only three tiny surface-mount external components required
Uses small ceramic capacitors.
Internal soft start
Current overload protection
No external compensation required

Key Specification

Operates from a single LiION cell (2.8V to 5.5V)
Pin programmable output voltage (1.05V, 1.3V, 1.5V and 1.8V)
400mA maximum load capability (300mA for B grade)
±2% PWM mode DC output voltage precision
2mV typ PWM mode output voltage ripple
150 µA typ PFM mode quiescent current
0.1µA typ shutdown mode current
Internal synchronous rectification for high PWM mode efficiency (91% at 2.8V_IN, 1.8V_OUT)
600kHz PWM mode switching frequency
SYNC input for PWM mode frequency synchronization from 500kHz to 1MHz

Applications

Mobile Phones
Hand-Held Radios
Battery Powered Devices

Reliability Metrics

Part Number	Process	Sample Size (EFR)	Device Hours	Long Term Failure Rates (FITS)	MTTF
LM2612ABP	ABCD150	10200	92400	39	26125054
LM2612ABPX	ABCD150	10200	92400	39	26125054
LM2612BBP	ABCD150	10200	92400	39	26125054
LM2612BBPX	ABCD150	10200	92400	39	26125054

For more information on Reliablitity Metrics, please click here.

Application Notes

Title	Size in Kbytes	Date	View Online	Download	Receive via Email
AN-1149: Application Note 1149 Layout Guidelines for Switching Power Supplies	113 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-1246: Application Note 1246 Stresses in Wide Input DC-DC Converters	272 Kbytes	26-Sep-02	View Online	Download	Receive via Email
AN-556: Application Note 556 Introduction to Power Supplies	159 Kbytes	25-Sep-02	View Online	Download	Receive via Email

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[Information as of 15-Jan-2004]

LM2612 Product Folder