LM2770SDX-1215 ,High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep ModeLM2770 High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep ModeDecember 2004LM2 ..
LM2770SDX-1215 ,High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep ModeApplicationschargepumpisoff,andtheoutputisdrivenwithalow-noise,n DSP Power Supplieslow-power linear ..
LM2770SDX-12157 ,High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep ModeFeaturesn High Efficiency Multi-Gain Architecture: Peak PowerThe LM2770 is a switched capacitor ste ..
LM2780TP ,Ultra-Low Ripple Switched Capacitor Voltage InverterPin DescriptionPin Name DescriptionA1 C2+ Secondary flying-capacitor connectionB1 V Input voltage. ..
LM2787BP ,Low Noise Regulated Switched Capacitor Voltage Inverter in micro SMDFeaturesn Inverts and regulates the input supply voltageTheLM2787CMOSNegativeRegulatedSwitchedCapac ..
LM2787BPX ,Low Noise Regulated Switched Capacitor Voltage Inverter in micro SMDPin DescriptionsPin No. Name FunctionA1 Cap+ Positive terminal for C .1B1 V Positive power supply i ..
LM61BIM3 ,2.7V, SOT-23 or TO-92 Temperature SensorElectrical CharacteristicsUnless otherwise noted, these specifications apply for +V = +3.0 V . Bold ..
LM61BIM3 ,2.7V, SOT-23 or TO-92 Temperature Sensorapplicationsn UL Recognized ComponentTypical Application01289702V = (+10 mV/˚C x T ˚C) + 600 mVOTem ..
LM61BIM3/NOPB ,?2?C Analog Output Temperature Sensor with TO-92 Option 3-SOT-23 -25 to 85Features 3 DescriptionThe LM61 device is a precision, integrated-circuit1• Calibrated Linear Scale ..
LM61BIM3X ,2.7V, SOT-23 or TO-92 Temperature SensorFeaturesn Calibrated linear scale factor of +10 mV/˚C j Nonlinearity ±0.8˚C (max)n Rated for full − ..
LM61BIM3X ,2.7V, SOT-23 or TO-92 Temperature Sensorapplicationsn UL Recognized ComponentTypical Application01289702V = (+10 mV/˚C x T ˚C) + 600 mVOTem ..
LM61BIM3X ,2.7V, SOT-23 or TO-92 Temperature SensorApplicationsn Cellular PhonesThe LM61 is a precision integrated-circuit temperature sen-sor that ca ..
LM2770SD-1215-LM2770SD-12157-LM2770SDX-1215-LM2770SDX-12157
High Efficiency Switched Capacitor Step-Down DC/DC Regulator with Sleep Mode
LM2770
High Efficiency Switched Capacitor Step-Down DC/DC
Regulator with Sleep Mode
General DescriptionThe LM2770isa switched capacitor step-down regulator
thatis idealfor powering low-voltage applicationsin portable
systems. The LM2770 can supply load currentsupto 250mA
and operates overan input voltage rangeof 2.7Vto 5.5V.
This makesthe LM2770a great choicefor systems powered 1-cell Li-Ion batteries and chargers. The output voltageof
the LM2770 canbe dynamically switched between two out-
put levels witha logic input pin. Output voltage pairs cur-
rently available include 1.2V/1.5V and 1.2V/1.575V. Other
pairsof voltage options canbe developed upon request.
LM2770 efficiencyis superiorto both fixed-gain switched
capacitor buck regulators and low-dropout linear regulators
(LDO’s). Multiple fractional gains maximize power efficiency
overthe entire input voltage and output current ranges. The
LM2770 can alsobe switched intoa low-power sleep mode
when load currents are light(≤ 20mA).In sleep mode, the
charge pumpisoff, andthe outputis driven witha low-noise,
low-power linear regulator.
Soft-start, short-circuit protection, current-limit protection,
and thermal-shutdown protection are also included. The
LM2770is availablein National’s small 10-pin Leadless
Leadframe Package (LLP-10).
Features High Efficiency Multi-Gain Architecture: Peak Power
Efficiency >85% Output Voltage Pairs: 1.2V/1.5V and 1.2V/1.575V Dynamic Output Voltage Selection ±3% Output Voltage Accuracy Output Currentsupto 250mA 2.7Vto 5.5V Input Range Low-Supply-Current Sleep Mode 55µA Quiescent Supply Currentin Full-Power Mode Soft-Start Short-Circuit Protectionin Full-Power Mode Current-Limit Protectionin Sleep Mode LLP-10 Package (3mmx 3mmx 0.8mm)
Applications DSP Power Supplies Baseband Power Supplies Mobile Phones and Pagers Portable Electronic Equipment
Typical Application CircuitLM2770 Efficiencyvs.
Low-Dropout Linear Regulator (LDO) Efficiency
December 2004
LM2770
High
Efficiency
Switched
Capacitor
Step-Down
DC/DC
Regulator
with
Sleep
Mode
