LT1054/LT1054L - Switched-Capacitor Voltage …

1 LT1054/LT1054L11954lfhFor more information DiagramFeaturesDescriptionSwitched-Capac itor Voltage Converter with RegulatorThe LT 1054 is a monolithic, bipolar, Switched-Capacitor Voltage converter and regulator. The LT1054 provides higher output current than previously available converters with significantly lower Voltage losses. An adaptive switch driver scheme optimizes efficiency over a wide range of output currents. Total Voltage loss at 100mA output current is typically This holds true over the full supply Voltage range of to 15V. Quiescent current is typically LT1054 also provides regulation, a feature not previ-ously available in Switched-Capacitor Voltage converters. By adding an external resistive divider a regulated output can be obtained. This output will be regulated against changes in both input Voltage and output current.

2 The LT1054 can also be shut down by grounding the feedback pin. Supply current in shutdown is less than 100 internal oscillator of the LT1054 runs at a nominal frequency of 25kHz. The oscillator pin can be used to ad-just the switching frequency or to externally synchronize the LT1054 is pin compatible with previous converters such the LTC1044/ICL7660. LT1054/LT1054 Voltage Lossapplications Output Current: 100mA (LT1054) 125mA (LT1054L) Reference and Error Amplifier for Regulation Low Loss: at 100mA Operating Range: to 15V (LT1054) to 7V (LT1054L) External Shutdown External Oscillator Synchronization Can Be Paralleled Pin Compatible with the LTC 1044/ICL7660 Available in SW16 and SO-8 Packages Voltage Inverter Voltage Regulator Negative Voltage Doubler Positive Voltage DoublerL, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation.

3 All other trademarks are the property of their respective GNDCAP+FEEDBACK/SHUTDOWN +RR*EXTERNAL VOUTLT1054 BD5287 QQVREFCIN*VINCOUT*++OUTPUT CURRENT (mA)0 Voltage LOSS (V)12501054 TA01 02575100125TJ = 125 CTJ = 25 CTJ = 55 VIN 15V (LT1054) VIN 7V (LT1054L)CIN = COUT = 100 F INDICATES GUARANTEED TEST POINTLT1054/LT1054L21054lfhFor more information maximum ratingsSupply Voltage (Note 2) LT105 4 ..16V LT1054L ..7 VInput Voltage Pin 1 .. 0V VPIN1 V+ Pin 3 (S Package) .. 0V VPIN3 V+ Pin 7 .. 0V VPIN7 VREF Pin 13 (S Package) .. 0V VPIN13 VREFO perating Junction Temperature Range LT105 4C/ LT105 4LC .. 0 C to 100 C LT105 4I .. 40 C to 100 C LT105 4M .. 55 C to 125 C(Note 1)12348765 TOP VIEWFB/SHDNCAP+GNDCAP V+OSCVREFVOUTN8 PACKAGE8-LEAD PLASTIC DIPJ8 PACKAGE8-LEAD CERAMIC DIP TJMAX = 125 C, JA = 130 C/W12348765 TOP VIEWV+OSCVREFVOUTFB/SHDNCAP+GNDCAP S8 PACKAGE8-LEAD PLASTIC SO TJMAX = 125 C, JA = 120 C/WSEE REGULATION AND CAPACITOR SELECTION SECTIONS IN THE APPLICATIONS INFORMATION FOR IMPORTANT INFORMATION ON THE S8 DEVICE12345678 TOP VIEWSW PACKAGE16-LEAD PLASTIC SO161514131211109 NCNCFB/SHDNCAP+GNDCAP NCNCNCNCV+OSCVREFVOUTNCNC TJMAX = 125 C.

4 JA = 150 C/Wpin conFigurationorDer inFormationLEAD FINISHTAPE AND REELPART MARKINGPACKAGE DESCRIPTIONTEMPERATURE RANGELT1054CN8#PBFLT1054CN88-Lead Plastic DIP0 C to 100 CLT1054IN8#PBFLT1054IN88-Lead Plastic DIP 40 C to 100 CLT1054MJ8LT1054MJ88-Lead Ceramic DIP 55 C to 125 CLT1054CS8#PBFLT1054CS8#TRPBF10548-Lead Plastic SO0 C to 100 CLT1054 LCS8#PBFLT1054 LCS8#TRPBF1054L8-Lead Plastic SO0 C to 100 CLT1054IS8#PBFLT1054IS8#TRPBF1054I8-Lead Plastic SO 40 C to 100 CLT1054 CSW#PBFLT1054 CSW#TRPBFLT1054 CSW16-Lead Plastic SO0 C to 100 CLT1054 ISW#PBFLT1054 ISW#TRPBFLT1054 ISW16-Lead Plastic SO 40 C to 100 CLT1054CJ8#PBF OBSOLETE PARTLT1054CJ8#TRPBFLT1054CJ88-Lead Ceramic DIP0 C to 100 CConsult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish more information on lead free part marking, go to: For more information on tape and reel specifications, go to: Junction Temperature (Note 3) LT105 4C/ LT105 4LC.

5 125 C LT105 4I ..125 C LT105 4M ..150 C Storage Temperature Range J8, N8 and S8 Packages .. 55 C to 150 C S Package .. 65 C to 150 CLead Temperature (Soldering, 10 sec) .. 300 C LT1054/LT1054L31954lfhFor more information characteristicsNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The absolute maximum supply Voltage rating of 16V is for unregulated circuits using LT1054. For regulation mode circuits using LT1054 with VOUT 15V at Pin 5 (Pin 11 on S package), this rating may be increased to 20V. The absolute maximum supply Voltage for LT1054L is 3: The devices are guaranteed by design to be functional up to the absolute maximum junction 4: For Voltage loss tests, the device is connected as a Voltage inverter, with pins 1, 6, and 7 (3, 12, and 13 S package) unconnected.

6 The Voltage losses may be higher in other configurations. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. (Note 7)PARAMETERCONDITIONSMINTYPMAXUNITSS upply CurrentILOAD = 0mALT1054: VIN = VIN = 15Vl mALT1054L: VIN = VIN = 7Vl mASupply Voltage RangeLT1054 LT1054Ll 7V VVoltage Loss (VIN |VOUT|)CIN = COUT = 100 F Tantalum (Note 4) IOUT = 10mA IOUT = 100mA IOUT = 125mA (LT1054L) l l l V V VOutput Resistance IOUT = 10mA to 100mA (Note 5)l1015 Oscillator FrequencyLT1054: VIN 15V LT1054L: VIN 7Vl l15 1525 2540 35kHz kHzReference VoltageIREF = 60 A, TJ = 25 C VRegulated VoltageVIN = 7V, TJ = 25 C, RL = 500 (Note 6) RegulationLT1054: 7V VIN 12V, RL = 500 (Note 6)l525mVLoad RegulationVIN = 7V, 100 500 (Note 6)l1050mVMaximum Switch Current300mASupply Current in ShutdownVPIN1 = 0Vl100200 ANote 5.

7 Output resistance is defined as the slope of the curve, ( VOUT vs IOUT), for output currents of 10mA to 100mA. This represents the linear portion of the curve. The incremental slope of the curve will be higher at currents <10mA due to the characteristics of the switch 6: All regulation specifications are for a device connected as a positive-to-negative converter/regulator with R1 = 20k, R2 = , C1 = F, (C1 = F S package) CIN = 10 F tantalum, COUT = 100 F tantalum. Note 7: The S8 package uses a different die than the H, J8, N8 and S packages. The S8 device will meet all the existing data sheet parameters. See Regulation and Capacitor Selection in the Applications Information section for differences in application more information perFormance characteristicsSupply Current in ShutdownAverage Input CurrentOutput Voltage LossOutput Voltage LossOutput Voltage LossShutdown ThresholdSupply CurrentOscillator FrequencyTEMPERATURE ( C) 50 SHUTDOWN THRESHOLD (V) Voltage (V)00 SUPPLY CURRENT (mA)12345IL = 051015LT1054 TPC02 TEMPERATURE ( C) 50 7015 FREQUENCY (kHz)253505075LT1054 TPC0 2525100125 VIN = 15 VVIN = Voltage (V)00 QUIESCENT CURRENT ( A)2040608012051015LT1054 TPC04100 VPIN1 = 0 VOUTPUT CURRENT (mA)00 AVERAGE INPUT CURRENT (mA)206080100140LT1050 TPC054012040100206080 INPUT CAPACITANCE ( F)00 Voltage LOSS (V)

8 TPC0 CONFIGURATIONCOUT = 100 F TANTALUMfOSC = 25kHzIOUT = 100mAIOUT = 50mAIOUT = 10mAOSCILLATOR FREQUENCY (kHz)10 Voltage LOSS (V)1210100LT1054 TPC07 INVERTER CONFIGURATIONCIN = 10 F TANTALUMCOUT = 100 F TANTALUMIOUT = 100mAIOUT = 50mAIOUT = 10mAOSCILLATOR FREQUENCY (kHz)10 Voltage LOSS (V)1210100LT1054 TPC08 INVERTER CONFIGURATIONCIN = 100 F TANTALUMCOUT = 100 F TANTALUMIOUT = 100mAIOUT = 50mAIOUT = 10mALT1054/LT1054L51954lfhFor more information perFormance characteristicsRegulated Output VoltageReference Voltage Temperature CoefficientTEMPERATURE ( C) 50 Voltage (V) TPC09 2525100125 TEMPERATURE ( C) 50 100 REFERENCE Voltage CHANGE (mV) 80 40 2001004005075LT1054 TPC10 60608020 2525100125 VREF AT 0 = FunctionsFB/SHDN (Pin 1): Feedback/Shutdown Pin. This pin has two functions. Pulling Pin 1 below the shutdown threshold ( ) puts the device into shutdown.

9 In shutdown the reference/regulator is turned off and switching stops. The switches are set such that both CIN and COUT are discharged through the output load. Quiescent current in shutdown drops to approximately 100 A (see Typical Performance Characteristics). Any open-collector gate can be used to put the LT1054 into shutdown. For normal (unregulated) operation the device will start back up when the external gate is shut off. In LT1054 circuits that use the regulation feature, the external resistor divider can provide enough pull-down to keep the device in shutdown until the output capacitor (COUT) has fully discharged. For most applica-tions where the LT1054 would be run intermittently, this does not present a problem because the discharge time of the output capacitor will be short compared to the off-time of the device. In applications where the device has to start up before the output capacitor (COUT) has fully discharged, a restart pulse must be applied to Pin 1 of the LT1054.

10 Using the circuit of Figure 5, the restart signal can be either a pulse (tp > 100 s) or a logic high. Diode coupling the restart signal into Pin 1 will allow the output Voltage to come up and regulate without overshoot. The resistor divider R3/R4 in Figure 5 should be chosen to provide a signal level at pin 1 of to Pin 1 is also the inverting input of the LT1054 s error amplifier and as such can be used to obtain a regulated output +/CAP (Pin 2/ Pin 4): Pin 2, the positive side of the input capacitor (CIN), is alternately driven between V+ and ground. When driven to V+, Pin 2 sources current from V+. When driven to ground Pin 2 sinks current to ground. Pin 4, the negative side of the input capacitor, is driven alternately between ground and VOUT. When driven to ground, Pin 4 sinks current to ground.