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參數(shù)資料
| 型號： | LM3686TL-AADW |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.375 A SWITCHING REGULATOR, 3400 kHz SWITCHING FREQ-MAX, PBGA12 |
| 封裝： | 0.50 MM PITCH, MICRO, SMD-12 |
| 文件頁數(shù)： | 1/20頁 |
| 文件大小： | 1847K |
| 代理商： | LM3686TL-AADW |
December 17, 2008
LM3686
Step-Down DC-DC Converter with Integrated Post Linear
Regulators System and Low-Noise Linear Regulator
General Description
The LM3686 is a step-down DC-DC converter with one inte-
grated 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 pro-
vides 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 rectifi-
cation 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 V
BATT with maximal 50 mA.
In the combined operation where both enables are raised to-
gether, 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 re-
duces battery consumption to 2.5
μA (typ.).
The LM3686 is available in a 12-bump micro SMD package.
A high-switching frequency of 3 MHz (typ.) allows the use of
a few tiny surface-mount components. Only six external sur-
face-mount components, an inductor and five ceramic capac-
itors, are required to establish a 15.66 mm2 total solution size.
Features
DC-DC REGULATOR
■ V
OUT_DCDC = 1.2V to 2.5V ( in 100 mV steps - factory
programmed )
■ 600 mA maximum load capability (LILO = OFF)
■ 3 MHz PWM fixed switching frequency (typ.)
■ Automatic PFM/PWM mode switching
■ Internal synchronous rectification for high efficiency
■ Internal soft start
DUAL RAIL LINEAR REGULATOR: LILO
■ Load transients < 50 mV peak typ.
■ Line transients < 1 mV peak typ.
■ V
OUT_LILO = 0.7V to 2.0V ( in 50 mV steps - factory
programmed )
■ 70 A typical I
Q from VIN_LILO
■ 350 mA Maximum Load Capability (Large FET)
LINEAR REGULATOR: LDO
■ Load transients < 80 mV peak typ.
■ Line transients < 1 mV peak typ.
■ V
OUT_LDO = 1.5V to 3.3V ( in 100 mV steps - factory
programmed )
■ 50 A typical I
Q
■ 300 mA Maximum Load Capability
COMBINED GLOBAL FEATURES
■ V
BATT ≥ VOUT_LILO + 1.5V or 2.7V, whichever is higher
■ 900 mA maximum combined load capability
■ Operates from a single Li-Ion cell or 3 cell NiMH/NiCd
batteries
■ Only six tiny surface-mount external components required
(one inductor, five ceramic capacitors)
■ 12–bump micro SMD
■ 100 A Iq from V
BATT
■ 15.66 mm2 total solution size
Applications
■ Moblie TV
■ Hand-Held Radios
■ Personal Digital Assistants
■ Palm-top PCs
■ Portable Instruments
■ Battery-Powered Devices
■ Portable Personal Clients
2008 National Semiconductor Corporation
300255
www.national.com
LM3686
Step-Down
DC-DC
Converter
with
Integrated
Post
Linear
Regulators
System
and
Low-
Noise
Linear
Regulator
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3686TL-AADWEV | 功能描述:電源管理IC開發(fā)工具 LM3686TL-AADW EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3686TLE-AADW/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM3686TLE-AAED | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator |
| LM3686TLE-AAED/NOPB | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT |
| LM3686TLE-AAEF | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Step-Down DC-DC Converter with Integrated Post Linear Regulators System and Low-Noise Linear Regulator |
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