LM3670MFX-1.8 ,Miniature Step-Down DC-DC Converter for Ultra Low Voltage CircuitsApplicationsswitching frequency - 1 MHz (typ) - allows use of tinyn Mobile phonessurface-mount comp ..
LM3670MFX-1.875 ,Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuitsfeatures and performance forn Available in fixed output voltages as well as anmobile phones and sim ..
LM3670MFX-2.5 ,Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuitsfeatures and performance forn Available in fixed output voltages as well as anmobile phones and sim ..
LM3670MFX-3.3 ,Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuitsapplications with com-adjustable versionplex power management systems. Automatic intelligentn SOT23 ..
LM3670MFX-ADJ ,Miniature Step-Down DC-DC Converter for Ultra Low Voltage CircuitsLM3670 Miniature Step-Down DC-DC Converter for Ultra Low Voltage CircuitsDecember 2004LM3670Miniatu ..
LM3671MF-1.2 ,2MHz , 600mA Step-Down DC-DC Converter in SOT23-5Applicationsextends the battery life through reduction of the quiescentn Mobile phonescurrent to 16 ..
LMV358IDGKRG4 ,Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-VSSOP -40 to 125Block Diagram... 162 Applications..... 18.3 Feature Description.... 173 Description....... 18.4 Dev ..
LMV358IDR ,Dual Low-Voltage Rail-to-Rail Output Operational AmplifierMaximum Ratings . 411.1 Layout Guidelines.... 227.2 Handling Ratings. 411.2 Layout Example....... 2 ..
LMV358IDRG4 ,Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-SOIC -40 to 125Electrical Characteristics: V + = 5 V..... 6CC12.3 Electrostatic Discharge Caution. 237.7 Shutdown ..
LMV358IDT ,Low power rail-to-rail input/output op-ampFeaturesLMV321ILT• Operating range from V = 2.7 to 6 V(SOT23-5)CC• Rail-to-rail input and output• ..
LMV358IPW ,Dual Low-Voltage Rail-to-Rail Output Operational AmplifierMaximum Ratings . 411.1 Layout Guidelines.... 227.2 Handling Ratings. 411.2 Layout Example....... 2 ..
LMV358IPWG4 ,Dual Low-Voltage Rail-to-Rail Output Operational Amplifier 8-TSSOP -40 to 125Sample & Support &Product Tools &TechnicalCommunityBuyFolder Documents SoftwareLMV358,LMV321,LMV324 ..
LM3670MF-ADJ-LM3670MFX-1.8-LM3670MFX-ADJ
Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits
LM3670
Miniature Step-Down DC-DC Converter for Ultra Low
Voltage Circuits
General DescriptionThe LM3670 step-down DC-DC converteris optimizedfor
powering ultra-low voltage circuits froma single Li-Ion cellor cell NiMH/NiCd batteries.It providesupto 350 mA load
current, overan input voltage range from 2.5Vto 5.5V. There
are several different fixed voltage output options availableas
wellasan adjustable output voltage version.
The device offers superior features and performance for
mobile phones and similar portable applications with com-
plex power management systems. Automatic intelligent
switching between PWM low-noise and PFM low-current
mode offers improved system control. During full-power op-
eration,a fixed-frequency1 MHz (typ). PWM mode drives
loads from ∼70mAto 350mA max, withupto 95% efficiency.
Hysteretic PFM mode extendsthe batterylife through reduc-
tionof the quiescent currentto15 µA (typ) during light
current loads and system standby. Internal synchronous rec-
tification provides high efficiency (90to 95% typ.at loads
between1 mA and 100 mA).In shutdown mode (Enablepin
pulled low) the device turnsoff and reduces battery con-
sumptionto0.1µA (typ.).
The LM3670is availableina SOT23-5 package.A high
switching frequency-1 MHz (typ)- allows useof tiny
surface-mount components. Only three external surface-
mount components,an inductor and two ceramic capacitors,
are required.
Features VOUT=adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V 2.5V≤ VIN≤ 5.5V15µA typical quiescent current 350 mA maximum load capability1 MHz PWM fixed switching frequency (typ.) Automatic PFM/PWM mode switching Availablein fixed output voltagesas wellasan
adjustable version SOT23-5 package Low drop out operation- 100% duty cycle mode Internal synchronous rectificationfor high efficiency Internal soft start 0.1µA typical shutdown current Operates froma single Li-Ion cellor3 cell NiMH/NiCd
batteries Only three tiny surface-mount external components
required (one inductor, two ceramic capacitors) Current overload protection
Applications Mobile phones Hand-Held Radios Personal Digital Assistants Palm-top PCs Portable Instruments Battery Powered Devices
Typical ApplicationFIGURE1. 1.8V- Fixed Output Voltage- Typical Application Circuit
December 2004
LM3670
Miniature
Step-Down
DC-DC
Converter
for
Ultra
Low
oltage
Circuits
