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LM3686 Fiches technique(PDF) 1 Page - Texas Instruments

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No de pièce LM3686
Description  Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator
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Fabricant  TI [Texas Instruments]
Site Internet  http://www.ti.com
Logo TI - Texas Instruments

LM3686 Fiches technique(HTML) 1 Page - Texas Instruments

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LM3686
www.ti.com
SNVS520E – AUGUST 2008 – REVISED MAY 2013
LM3686 Step-Down DC-DC Converter with Integrated Post Linear Regulators System and
Low-Noise Linear Regulator
Check for Samples: LM3686
1
FEATURES
APPLICATIONS
2
DC-DC REGULATOR
Moblie TV
VOUT_DCDC = 1.2V to 2.5V (in 100 mV Steps -
Hand-Held Radios
Factory Programmed)
Personal Digital Assistants
600 mA Maximum Load Capability (LILO =
Palm-top PCs
OFF)
Portable Instruments
3 MHz PWM Fixed Switching Frequency (Typ.)
Battery-Powered Devices
Automatic PFM/PWM Mode Switching
Portable Personal Clients
Internal Synchronous Rectification for High
Efficiency
DESCRIPTION
Internal Soft Start
The LM3686 is a step-down DC-DC converter with
one integrated very low dropout linear regulator and a
DUAL RAIL LINEAR REGULATOR: LILO
low noise linear regulator optimized for powering
Load Transients < 50 mV Peak Typ.
ultra-low voltage circuits from a single Li-Ion cell or 3
Line Transients < 1 mV Peak Typ.
cell NiMH/NiCd batteries. It provides three outputs
with combined load current up to 900 mA over an
VOUT_LILO = 0.7V to 2.0V (in 50 mV Steps -
input voltage range from 2.7V to 5.5V.
Factory Programmed)
70 µA Typical IQ From VIN_LILO
The device offers superior features and performance
for many applications. Automatic intelligent switching
350 mA Maximum Load Capability (Large FET)
between PWM low-noise and PFM low-current mode
LINEAR REGULATOR: LDO
offers improved system control. During full-power
Load Transients < 80 mV Peak Typ.
operation, a fixed-frequency 3 MHz (typ.), PWM
mode drives loads from ~70 mA to 600 mA max.
Line Transients < 1 mV Peak Typ.
Hysteretic PFM mode extends the battery life through
VOUT_LDO = 1.5V to 3.3V (in 100 mV Steps -
reduction of the quiescent current to 28
μA (typ.) at
Factory Programmed)
light load and system standby. Internal synchronous
50 µA Typical IQ
rectification provides high efficiency.
300 mA Maximum Load Capability
Three enable pins allow the separate operation of
COMBINED GLOBAL FEATURES
either the DC-DC, post-regulation linear regulator or
the linear regulator alone. If the DC-DC is not
VBATT ≥ VOUT_LILO + 1.5V or 2.7V, Whichever is
enabled during startup of the post-regulation linear
Higher
regulator, a parallel small pass transistor supplies the
900 mA Maximum Combined Load Capability
linear regulator from VBATT with maximal 50 mA. In
Operates From a Single Li-Ion Cell or 3 Cell
the combined operation where both enables are
raised
together,
the
small
pass
transistor
is
NiMH/NiCd Batteries
deactivated and the big pass transistor provides 350
Only Six Tiny Surface-mount External
mA output current. In shutdown mode (Enable pins
Components Required (One Inductor, Five
pulled low), the device turns off and reduces battery
Ceramic Capacitors)
consumption to 2.5
μA (typ.).
12–bump DSBGA
100 µA Iq From VBATT
15.66 mm2 Total Solution Size
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2
All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2008–2013, Texas Instruments Incorporated
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.


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