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LM2612BL Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM2612BL
Description  400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra Low-Voltage Circuits
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400mA Sub-miniature, Programmable, Step-Down DC-DC
Converter for Ultra Low-Voltage Circuits
General Description
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 out-
put 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 applica-
tions. 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, in-
ternal 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 160 µA (typ.) during system standby. Shutdown mode
turns the device off and reduces battery consumption to
0.02µA (typ.). Additional features include soft start and cur-
rent 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.
Key Specifications
Operates from a single LiION cell (2.8V to 5.5V)
Internal synchronous rectification for high PWM mode
Pin programmable output voltage (1.05V, 1.3V, 1.5V and
400mA maximum load capability (300mA for B grade)
n ±
2% PWM mode DC output voltage precision
5mV typ PWM mode output voltage ripple
160 µA typ PFM mode quiescent current
0.02µA typ shutdown mode current
600kHz PWM mode switching frequency
SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
Sub-miniature 10-pin micro SMD package
Only three tiny surface-mount external components
Uses small ceramic capacitors
Internal soft start
Current overload protection
No external compensation required
Thermal shutdown protection
Mobile Phones
Hand-Held Radios
Battery Powered Devices
Typical Application Circuit
December 2002
© 2002 National Semiconductor Corporation

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