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LM2614ATLX Datasheet

  • LM2614ATLX

  • 400mA Sub-Miniature Adjustable DC-DC Converter Optimized for...

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LM2614 400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers
August 2002
LM2614
400mA Sub-Miniature Adjustable DC-DC Converter
Optimized for RF Power Amplifiers
General Description
The LM2614 DC-DC converter is optimized for powering RF
power amplifiers (PAs) from a single Lithium-Ion cell. It steps
down an input voltage of 2.8V to 5.5V to an output of 1.0V to
3.6V at up to 400mA (300mA for B grade). Output voltage is
set using an analog input to VCON in the application circuit.
The device offers three modes for mobile phones and similar
RF PA applications. Fixed-frequency PWM mode minimizes
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 LM2614 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 LM2614 can be dynamically controlled for output volt-
age changes from 1.0V to 3.6V in
<
30碌s. The device fea-
tures external compensation to tailor the response to a wide
range of operating conditions.
Key Specifications
Operates from a single LiION cell (2.8V to 5.5V)
Adjustable output voltage (1.0V to 3.6V)
鹵
1% DC feedback voltage precision
400mA maximum load capability(300mA for B grade)
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
Battery Powered RF Devices
漏 2002 National Semiconductor Corporation
DS200367
www.national.com

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