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LM2619ATLX Datasheet

  • LM2619ATLX

  • 500mA Sub-Miniature Step-Down DC-DC Converter

  • 16頁

  • NSC

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LM2619 500mA Sub-Miniature Step-Down DC-DC Converter
November 2002
LM2619
500mA Sub-Miniature Step-Down DC-DC Converter
General Description
The LM2619 step down DC-DC converter is optimized for
powering circuits from a single Lithium-Ion cell. It steps down
an input voltage of 2.8V to 5.5V to an output of 1.5V to 3.6V
at up to 500mA. Output voltage is set using resistor feedback
dividers.
The device offers three modes for mobile phones and similar
portable applications. Fixed-frequency PWM mode mini-
mizes RF interference. A SYNC input allows synchronizing
the switching frequency in a range of 500kHz to 1MHz. Low
current hysteretic PFM mode reduces quiescent current to
160碌A(chǔ) (typ.). Shutdown mode turns the device off and re-
duces battery consumption to 0.02碌A(chǔ) (typ.).
Current limit and thermal shutdown features protect the de-
vice and system during fault conditions.
The LM2619 is available in a 10 bump micro SMD package.
This packaging uses National鈥檚 chip-scale micro SMD tech-
nology and offers the smallest possible size. A high switching
frequency (600kHz) allows use of tiny surface-mount com-
ponents.
The device features external compensation to tailor the re-
sponse to a wide range of operating conditions.
Key Specifications
Operates from a single LiION cell (2.8V to 5.5V)
Output voltage (1.5V to 3.6V)
鹵
1% DC feedback voltage precision
500mA maximum load capability
600碌A(chǔ) typ PWM mode quiescent current
0.02碌A(chǔ) typ shutdown current
600kHz PWM switching frequency
SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
n
High efficiency (96% typ at 3.9V
IN
, 3.6V
OUT
and 200mA)
in PWM mode from internal synchronous rectification
n
100% Maximum Duty Cycle for Lowest Dropout
n
n
n
n
n
n
n
n
Features
n
n
n
n
n
n
n
Sub-miniature 10-bump thin micro SMD package
Uses small ceramic capacitors
5mV typ PWM mode output voltage ripple(C
OUT
= 22碌F)
Internal soft start
Current overload protection
Thermal Shutdown
External compensation
Applications
n
n
n
n
Mobile Phones
Hand-Held Radios
RF PC Cards
Wireless LAN Cards
漏 2002 National Semiconductor Corporation
DS200574
www.national.com

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