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LM2612ABLX Datasheet

  • LM2612ABLX

  • 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter...

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LM2612BL 400mA Sub-miniature, Programmable, Step-Down DC-DC Converter for Ultra
Low-Voltage Circuits
December 2002
LM2612BL
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 碌A(chǔ) (typ.) during system standby. Shutdown mode
turns the device off and reduces battery consumption to
0.02碌A(chǔ) (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鈥檚 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
n
Operates from a single LiION cell (2.8V to 5.5V)
n
Internal synchronous rectification for high PWM mode
efficiency
n
Pin programmable output voltage (1.05V, 1.3V, 1.5V and
1.8V)
n
400mA maximum load capability (300mA for B grade)
n
鹵
2% PWM mode DC output voltage precision
n
5mV typ PWM mode output voltage ripple
n
160 碌A(chǔ) typ PFM mode quiescent current
n
0.02碌A(chǔ) typ shutdown mode current
n
600kHz PWM mode switching frequency
n
SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
Features
n
Sub-miniature 10-pin micro SMD package
n
Only three tiny surface-mount external components
required
n
Uses small ceramic capacitors
n
Internal soft start
n
Current overload protection
n
No external compensation required
n
Thermal shutdown protection
Applications
n
Mobile Phones
n
Hand-Held Radios
n
Battery Powered Devices
Typical Application Circuit
20041802
漏 2002 National Semiconductor Corporation
DS200418
www.national.com

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