LTC3025-1/LTC3025-2/LTC3025-3/LTC3025-4 - …

1 LTC3025-1/LTC3025-2/LTC3025-3/LTC3025-41 30251234ffTypical applicaTionFeaTuresapplicaTionsDescripTi on500mA MicropowerVLDO Linear RegulatorsThe LTC 3025-X is a micropower, vldo (very low drop-out) linear regulator which operates from input voltages as low as The device is capable of supplying 500mA of output current with a typical dropout voltage of only 85mV. A BIAS supply is required to run the internal reference and LDO circuitry while output current comes directly from the IN supply for high efficiency regulation. The LTC3025-1 features an adjustable output with a low reference while the LTC3025-2, LTC3025-3, and LTC3025-4 have fixed , and output voltages LTC3025-X s low quiescent current makes it an ideal choice for use in battery-powered systems. For 3-cell NiMH and single cell Li-Ion applications, the BIAS voltage can be supplied directly from the battery while the input can come from a high efficiency buck regulator, providing a high efficiency, low noise features include high output voltage accuracy, excellent transient response, stability with ultralow ESR ceramic capacitors as small as 1 F, short-circuit and thermal overload protection and output current limiting.

2 The LTC3025-X is available in a tiny, low profile ( ) 6-lead DFN (2mm 2mm) Output Voltage from Input Supplyn Wide Input Voltage Range: to Stable with Ceramic Capacitorsn Very Low Dropout: 85mV at 500mAn Adjustable Output Range: to (LTC3025-1)n Fixed Output: (LTC3025-2), (LTC3025-3), (LTC3025-4)n 2% Voltage Accuracy over Temperature, Supply and Loadn Low Noise: 80 VRMS (10Hz to 100kHz)n BIAS Voltage Range: to Fast Transient Recoveryn Shutdown Disconnects Load from VIN and VBIASn Low Operating Current: IIN = 4 A, IBIAS = 50 A Typn Low Shutdown Current: IIN = 1 A, IBIAS = A Typn Output Current Limitn Thermal Overload Protectionn Available in 6-Lead (2mm 2mm) DFN Packagen Low Power Handheld Devicesn Low Voltage Logic Suppliesn DSP Power Suppliesn Cellular Phonesn Portable Electronic Equipmentn Handheld Medical Instrumentsn Post Regulator for Switching Supply Noise Rejection1 MHz VIN Supply FLi-IonOR 3-CELLNiMHINSHDNOUTVOUT = 500mA30251234 TA01 SENSEGNDOFF HIGHEFFICIENCYDC/DCBUCKVIN (V) (dB) = = = 100mAIOUT = 300mACOUT = 1 FCOUT = 10 FL, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and vldo and ThinSOT are trademarks of Linear Technology Corporation.

3 All other trademarks are the property of their respective owners. Protected by Patents including 7224204, conFiguraTionabsoluTe MaxiMuM raTingsVBIAS, VIN to GND .. to 6 VSHDN to GND .. to 6 VSENSE, ADJ to GND .. to 6 VVOUT .. to VIN + or 6 VOperating Junction Temperature Range(Note 3) .. 40 C to 125 CStorage Temperature Range .. 65 C to 125 COutput Short-Circuit Duration ..Indefinite(Notes 1, 2)TOP VIEW7DC6 PACKAGE6-LEAD (2mm 2mm) PLASTIC DFN456321 BIASGNDINSHDNADJ/SENSE*OUT TJMAX = 125 C, JA = 102 C/W, JC = 20 C/W EXPOSED PAD (PIN 7) IS GND, MUST BE SOLDERED TO PCB*ADJ FOR LTC3025-1, SENSE FOR LTC3025-2, LTC3025-3, LTC3025-4orDer inForMaTionLEAD FREE FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC3025 EDC-1#PBFLTC3025 EDC-1#TRPBFLDDW6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-1#PBFLTC3025 IDC-1#TRPBFLDDW6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 EDC-2#PBFLTC3025 EDC-2#TRPBFLDMK6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-2#PBFLTC3025 IDC-2#TRPBFLDMK6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 EDC-3#PBFLTC3025 EDC-3#TRPBFLDQS6-Lead (2mm 2mm)

4 Plastic DFN 40 C to 125 CLTC3025 IDC-3#PBFLTC3025 IDC-3#TRPBFLDQS6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 EDC-4#PBFLTC3025 EDC-4#TRPBFLDPQ6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-4#PBFLTC3025 IDC-4#TRPBFLDPQ6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLEAD BASED FINISHTAPE AND REELPART MARKING*PACKAGE DESCRIPTIONTEMPERATURE RANGELTC3025 EDC-1 LTC3025 EDC-1#TRLDDW6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-1 LTC3025 IDC-1#TRLDDW6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 EDC-2 LTC3025 EDC-2#TRLDMK6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-2 LTC3025 IDC-2#TRLDMK6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 EDC-3 LTC3025 EDC-3#TRLDQS6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-3 LTC3025 IDC-3#TRLDQS6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 EDC-4 LTC3025 EDC-4#TRLDPQ6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CLTC3025 IDC-4 LTC3025 IDC-4#TRLDPQ6-Lead (2mm 2mm) Plastic DFN 40 C to 125 CConsult LTC Marketing for parts specified with wider operating temperature ranges.

5 *The temperature grade is identified by a label on the shipping more information on lead free part marking, go to: For more information on tape and reel specifications, go to: characTerisTics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VIN = , VBIAS = , COUT = 1 F, CIN = F, CBIAS = F (all capacitors ceramic) unless otherwise noted. (Note 3)PARAMETERCONDITIONSMINTYPMAXUNITSVIN Operating Voltage (Note 4) Operating Voltage (Note 4) Undervoltage Operating CurrentIOUT = 10 A, VOUT = , LTC3025-1l410 AVIN Operating CurrentIOUT = 0 A, LTC3025-2/LTC3025-3/LTC3025-4l410 AVBIAS Operating CurrentIOUT = 10 A, VOUT = , LTC3025-1l5080 AVBIAS Operating CurrentIOUT = 0 A, LTC3025-2/LTC3025-3/LTC3025-4l5080 AVIN Shutdown CurrentVSHDN = 0V15 AVBIAS Shutdown CurrentVSHDN = AVADJ Regulation Voltage (Note 5)1mA IOUT 500mA, VOUT = , VIN 5V, LTC3025-1 1mA IOUT 500mA, VOUT = , VIN 5V, LTC3025-1 VVSENSE Regulation Voltage (Note 5)1mA IOUT 500mA, VIN 5V, LTC3025-2 1mA IOUT 500mA, VIN 5V, LTC3025-2 VVSENSE Regulation Voltage (Note 5)

6 1mA IOUT 500mA, VIN 5V, LTC3025-3 1mA IOUT 500mA, VIN 5V, LTC3025-3 VVSENSE Regulation Voltage (Note 5)1mA IOUT 500mA, VIN 5V, LTC3025-4 1mA IOUT 500mA, VIN 5V, LTC3025-4 VIADJ ADJ Input CurrentVADJ = , LTC3025-1 50050nAOUT Load Regulation (Referred to ADJ Pin) IOUT = 1mA to 500mA, LTC3025-1 Load Regulation IOUT = 1mA to 500mA, LTC3025-2 IOUT = 1mA to 500mA, LTC3025-3 IOUT = 1mA to 500mA, LTC3025-4 1 mV mVVIN Line Regulation (Referred to ADJ Pin)VIN = to 5V, VBIAS = , VOUT = , IOUT = 1mA, Line RegulationVIN = to 5V, VBIAS = , IOUT = 1mA, LTC3025-2 VIN = to 5V, VBIAS = , IOUT = 1mA, LTC3025-3 VIN = to 5V, VBIAS = , IOUT = 1mA, mV mVVBIAS Line RegulationVIN = , VBIAS = to 5V, VOUT = , IOUT = 1mA, Line RegulationVIN = , VBIAS = to 5V, IOUT = 1mA, LTC3025-2 VIN = , VBIAS = to 5V, IOUT = 1mA, LTC3025-3 VIN = , VBIAS = to 5V, IOUT = 1mA, LTC3025-4l l mV mVVIN to VOUT Dropout Voltage (Notes 4, 6)VBIAS = 3V, VIN = , IOUT = 500mA, VADJ = (LTC3025-1), VSENSE = (LTC3025-2) l85120 170mV mVVIN to VOUT Dropout Voltage (Notes 4, 6)VBIAS = , VIN = , IOUT = 500mA, VSENSE = (LTC3025-3) l90130 185mV mVVIN to VOUT Dropout Voltage (Notes 4, 6)

7 VBIAS = , VIN = , IOUT = 500mA, VSENSE = (LTC3025-4) l90130 185mV mVVBIAS to VOUT Dropout Voltage (Note 4) 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: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125 C when overtemperature protection is operation above the specified maximum operating junction temperature may impair device 3: The LTC3025-X regulators are tested and specified under pulse load conditions such that TJ TA. The LTC3025E-X are guaranteed to meet performance specifications from 0 C and 125 C. Specifications over the 40 C to 125 C operating junction temperature range are assured by design, characterization and correlation with statistical process controls.

8 The LTC3025I-X are guaranteed to meet performance specifications over the full 40 C to 125 C operating junction temperature 4: For the LTC3025-1, a regulated output voltage will only be available when the minimum IN and BIAS operating voltages as well as the IN to OUT and BIAS to OUT dropout voltages are all satisfied. For the LTC3025-2/LTC3025-3/LTC3025-4 the minimum IN operating voltage assumes IOUT = 500mA. For correct regulation at IOUT < 500mA the minimum IN operating voltage decreases to the maximum VSENSE Regulation Voltage as IOUT decreases to 0mA ( VINMIN = at IOUT = 250mA for the LTC3025-2).Note 5: Operating conditions are limited by maximum junction temperature. The regulated output voltage specification will not apply for all possible combinations of input voltage and output current.

9 When operating at maximum input voltage, the output current range must be limited. When operating at maximum output current, the input voltage range must be 6: Dropout voltage is minimum input to output voltage differential needed to maintain regulation at a specified output current. In dropout, the output voltage will be equal to VIN VDROPOUT. The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25 C. VIN = , VBIAS = , COUT = 1 F, CIN = F, CBIAS = F (all capacitors ceramic) unless otherwise noted. (Note 3)elecTrical characTerisTicsPARAMETERCONDITIONSMINTYP MAXUNITSIOUT Continuous Output Currentl500mAIOUT Current LimitVADJ = 0V(LTC3025-1), VSENSE = 0V(LTC3025-2/LTC3025-3/LTC3025-4)1130mAe n Output Voltage Noisef = 10Hz to 100kHz, IOUT = 300mA80 VRMSVIH SHDN Input High SHDN Input Low SHDN Input High CurrentSHDN = 11 AIL SHDN Input Low CurrentSHDN = 0V 11 ALTC3025-1/LTC3025-2/LTC3025-3/LTC3025-4 530251234ff VIN No Load Operating Current VIN Shutdown Current Adjust Voltage vs Temperature SHDN Threshold vs Temperature Current Limit vs VIN VoltageBurst Mode DC/DC Buck Ripple RejectionTypical perForMance characTerisTicsVIN (V) C85 C25 C 40 ( A)VBIAS = 5 VVOUT = (V) C 40 ( A)85 CVBIAS = 5 VTEMPERATURE ( C) 50395 ADJUST VOLTAGE (mV)

10 3963983994004054020507530251234 G06397403404401 2525100125 VBIAS = = = 10 ATEMPERATURE ( C) 500 SHDN THRESHOLD (mV)10030040050010007000507530251234 G07200800900600 2525100125 VBIAS = = 5 VVIN (V)0 CURRENT LIMIT (mA)60080010003530251234 G0840020001241200140016006 VINAC 100mV/DIVVOUTAC 10mV/DIVVIN = = = 1 FIOUT = 50mA10 s/DIV30251234 G09(TA = 25 C unless otherwise noted)VIN to VOUT Dropout Voltage vs IOUTO perating BIAS Current vs Output CurrentBIAS No Load Operating CurrentIOUT (mA)0 DROPOUT VOLTAGE (mV)4080120206010010020030040030251234 G01500500150250350450TA = 40 CTA = 125 CTA = 25 CVBIAS = = (mA) ( A)15020025010100030251234 40 C125 C25 CVBIAS (V) ( A)30404530251234 = = C25 C 40 CLTC3025-1/LTC3025-2/LTC3025-3/LTC3025-4 630251234ffTypical perForMance characTerisTics Transient Response250mA10mAIOUTVOUTAC10mV/DIVVIN = = = = 1 F100 s/DIV30251234 G13 VIN to VOUT Dropout Voltage vs VIN (25 C) LTC3025-1(TA = 25 C unless otherwise noted)VIN to VOUT Dropout Voltage vs VIN (90 C) LTC3025-1 VIN (V)10 DROPOUT (V) = = 500mATA = 25 CBIAS = = 3 VBIAS = = = 5 VVIN (V)10 DROPOUT (V) = = 500mATA = 90 CBIAS = = = 5 VBIAS = 3 VBIAS = Ripple Rejection vs FrequencyBIAS Ripple Rejection vs Frequency 3 MHz VIN Supply RejectionFREQUENCY (Hz)1005060701M30251234 G1040301k10k100k10M20100 REJECTION (dB)VBIAS = =