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LM2614 Datasheet(Fiches technique) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM2614
Description  400mA Sub-Miniature Adjustable DC-DC Converter Optimized for RF Power Amplifiers
Télécharger  16 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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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
160µA (typ.). Shutdown mode turns the device off and re-
duces battery consumption to 0.02µA (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’s 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 <30µs. The device fea-
tures external compensation to tailor the response to a wide
range of operating conditions.
Key Specifications
n
Operates from a single LiION cell (2.8V to 5.5V)
n
Adjustable output voltage (1.0V to 3.6V)
n ±
1% DC feedback voltage precision
n
400mA maximum load capability(300mA for B grade)
n
600µA typ PWM mode quiescent current
n
0.02µA typ shutdown current
n
600kHz PWM switching frequency
n
SYNC input for PWM mode frequency synchronization
from 500kHz to 1MHz
n
High efficiency (96% typ at 3.9V
IN, 3.6VOUT and 200mA)
in PWM mode from internal synchronous rectification
n
100% Maximum Duty Cycle for Lowest Dropout
Features
n
Sub-miniature 10-bump thin micro SMD package
n
Uses small ceramic capacitors
n
5mV typ PWM mode output voltage ripple(C
OUT = 22µF)
n
Internal soft start
n
Current overload protection
n
Thermal Shutdown
n
External compensation
Applications
n
Mobile Phones
n
Hand-Held Radios
n
RF PC Cards
n
Battery Powered RF Devices
August 2002
© 2002 National Semiconductor Corporation
DS200367
www.national.com




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