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LM3686 데이터시트(PDF) 1 Page - Texas Instruments

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부품명 LM3686
상세설명  Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator
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LM3686
www.ti.com
SNVS520D – AUGUST 2008 – REVISED MARCH 2011
LM3686 Step-Down DC-DC Converter with Integrated Post Linear Regulators System and
Low-Noise Linear Regulator
Check for Samples: LM3686
1
FEATURES
COMBINED GLOBAL FEATURES
2
DC-DC REGULATOR
VBATT ≥ VOUT_LILO + 1.5V or 2.7V, whichever is
higher
VOUT_DCDC = 1.2V to 2.5V ( in 100 mV steps -
900 mA maximum combined load capability
factory programmed )
Operates from a single Li-Ion cell or 3 cell
600 mA maximum load capability (LILO = OFF)
NiMH/NiCd batteries
3 MHz PWM fixed switching frequency (typ.)
Only six tiny surface-mount external
Automatic PFM/PWM mode switching
components required (one inductor, five
Internal synchronous rectification for high
ceramic capacitors)
efficiency
12–bump micro SMD
Internal soft start
100 µA Iq from VBATT
DUAL RAIL LINEAR REGULATOR: LILO
15.66 mm2 total solution size
Load transients < 50 mV peak typ.
Line transients < 1 mV peak typ.
APPLICATIONS
VOUT_LILO = 0.7V to 2.0V ( in 50 mV steps -
Moblie TV
factory programmed )
Hand-Held Radios
70 µA typical IQ from VIN_LILO
Personal Digital Assistants
350 mA Maximum Load Capability (Large FET)
Palm-top PCs
LINEAR REGULATOR: LDO
Portable Instruments
Load transients < 80 mV peak typ.
Battery-Powered Devices
Line transients < 1 mV peak typ.
Portable Personal Clients
VOUT_LDO = 1.5V to 3.3V ( in 100 mV steps -
factory programmed )
50 µA typical IQ
300 mA Maximum Load Capability
DESCRIPTION
The LM3686 is a step-down DC-DC converter with one integrated very low dropout linear regulator and a low
noise linear regulator optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell
NiMH/NiCd batteries. It provides three outputs with combined load current up to 900 mA over an input voltage
range from 2.7V to 5.5V.
The device offers superior features and performance for many applications. Automatic intelligent switching
between PWM low-noise and PFM low-current mode offers improved system control. During full-power operation,
a fixed-frequency 3 MHz (typ.), PWM mode drives loads from ~70 mA to 600 mA max. Hysteretic PFM mode
extends the battery life through reduction of the quiescent current to 28
μA (typ.) at light load and system
standby. Internal synchronous rectification provides high efficiency.
Three enable pins allow the separate operation of either the DC-DC, post-regulation linear regulator or the linear
regulator alone. If the DC-DC is not enabled during startup of the post-regulation linear regulator, a parallel small
pass transistor supplies the linear regulator from VBATT with maximal 50 mA. In the combined operation where
both enables are raised together, the small pass transistor is deactivated and the big pass transistor provides
350 mA output current. In shutdown mode (Enable pins pulled low), the device turns off and reduces battery
consumption to 2.5
μA (typ.).
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 © 2008–2011, 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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