LTC3525D-3.3 400mA Micropower Synchronous Step-Up DC/DC Converter with Pass Through Mode Features n n n n n n n n n n n n n Description VOUT Connected to VIN in Shutdown Up to 95% Efficiency 0.85V Minimum Input Start-Up Voltage Fixed Output Voltage of 3.3V Delivers 60mA at 3.3V from a 1V Input, or 140mA at 3.3V from a 1.8V Input Burst Mode(R) Operation: IQ = 7A VIN Range: 0.5V to 4.5V Only Three External Components VIN > VOUT Operation Anti-Ringing Control Short-Circuit and Overtemperature Protection Very Low Profile of 1mm Tiny 6-Lead SC70 Package The LTC(R)3525D-3.3 is a high efficiency synchronous stepup DC/DC converter that can start up with an input as low as 0.85V. It offers a compact, high efficiency alternative to charge pumps in single cell or dual cell alkaline or Li-Ion applications. Only three small external components are required. The LTC3525D features a fixed output voltage of 3.3V. In shutdown, VOUT is connected to VIN through the inductor. The device includes a 0.5 N-channel MOSFET switch and a 0.8 P-channel synchronous rectifier. Peak switch current ranges from 150mA to 400mA, depending on load, providing enhanced efficiency. Quiescent current is an ultralow 7A, maximizing battery life in portable applications. Other features include anti-ringing control and thermal shutdown. The LTC3525D is available in a tiny 6-Lead SC70 package. Applications n n n n MP3 Players Portable Instruments Glucose Meters Digital Cameras List of LTC3525 Options PART NAME L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Patents pending. INPUT START-UP VOLTAGE OUTPUT VOLTAGE VOUT STATUS IN SHUTDOWN MODE LTC3525-3 0.85V 3V Output Disconnect LTC3525-3.3 0.85V 3.3V Output Disconnect LTC3525-5 0.85V 5V Output Disconnect LTC3525D-3.3 0.85V 3.3V LTC3525L-3 0.7V 3V Typical Application Pass Through Mode Output Disconnect LTC3525D-3.3 Efficiency and Power Loss vs Load Current L1* 10H 100 100 90 PASS THROUGH ON 1F *MURATA LQH32CN100K53 SW SHDN VOUT GND GND VOUT 3.3V 140mA 10F 3525 TA01 EFFICIENCY (%) VIN 70 10 POWER LOSS (mW) 80 LTC3525D-3.3 VIN 1.8V TO 3.2V EFFICIENCY 60 1 POWER LOSS 50 40 0.1 VIN = 3V VIN = 2.4V VIN = 1.2V 30 20 0.01 0.1 1 10 LOAD (mA) 100 0.01 1000 LT3525 * TA02 3525d33fb For more information www.linear.com/LTC3525D3.3 1 LTC3525D-3.3 Absolute Maximum Ratings Pin Configuration (Note 1) VIN, VOUT Voltage......................................... -0.3V to 6V SW Voltage.................................................. -0.3V to 6V SW Voltage < 100ns..................................... -0.3V to 7V SHDN Voltage.............................................. -0.3V to 6V Operating Junction Temperature Range (Notes 2, 5)............................................. -40C to 125C Storage Temperature Range................... -65C to 125C Lead Temperature (Soldering, 10 sec).................... 300C TOP VIEW SHDN 1 6 SW GND 2 5 GND VIN 3 4 VOUT SC6 PACKAGE 6-LEAD PLASTIC SC70 TJMAX = 125C JA = 256C/W IN FREE AIR, JA = 150C/W ON BOARD OVER GROUND PLANE Order Information LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3525DESC6-3.3#PBF LTC3525DESC6-3.3#TRPBF LCQZ 6-Lead Plastic SC70 -40C to 85C LTC3525DISC6-3.3#PBF LTC3525DISC6-3.3#TRPBF LCQZ 6-Lead Plastic SC70 -40C to 125C Consult LTC Marketing for parts specified with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ 2 3525d33fb For more information www.linear.com/LTC3525D3.3 LTC3525D-3.3 Electrical Characteristics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25C. VIN = 1.2V, VSHDN = 1.2V, VOUT = 3.3V unless otherwise noted. (Note 2) PARAMETER CONDITIONS MIN Input Start-Up Voltage MAX 0.85 1 UNITS V Output Voltage (Note 6) 3.30 3.40 V Quiescent Current, VOUT SHDN = VIN (Note 4) 7 15 A Quiescent Current, VIN SHDN = VIN (Note 4) 0.5 3 A Quiescent Current, VIN - Shutdown SHDN = 0V, VOUT = VIN = 3.3V Including Switch Leakage 3 10 A NMOS Switch On-Resistance (Note 3) 0.5 PMOS Switch On-Resistance (Note 3) 0.8 0.45 A l Peak Current Limit 0.4 SHDN Threshold Voltage SHDN Input Current 3.20 TYP 0.4 VSHDN = VIN or VOUT Note 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 lifetime. Note 2: The LTC3525D is tested under pulsed load conditions such that TJ TA. The LTC3525DE is guaranteed to meet performance specifications from 0C to 85C. Specifications over the -40C to 85C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3525DI is guaranteed over the -40C to 125C operating junction temperature range. Note that the maximum ambient temperature consistent with these specifications is determined by specific operating conditions in conjunction with board layout, the rated package thermal impedance and other environmental factors. TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formula: TJ = TA + (PD * 150C/W) 0.6 1 V 0.01 1 A Note 3: Specification is guaranteed by design and not 100% tested in production. Note 4: Current Measurements are performed when the LTC3525D is not switching. Note 5: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed 125C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 6: Consult LTC Marketing for other output voltage options. 3525d33fb For more information www.linear.com/LTC3525D3.3 3 LTC3525D-3.3 Typical Performance Characteristics Maximum Output Current vs VIN (for VOUT to Drop 2.5%) TA = 25C unless otherwise noted. Maximum Startup Load vs VIN (Resistive Load) 300 No-Load Input Current vs VIN 50 250 45 250 35 150 150 IIN (A) LOAD (mA) 200 IOUT (mA) 40 200 100 100 50 10 1.5 2.0 2.5 3.0 VIN (V) 4.0 3.5 4.5 0.5 1.0 1.5 2.0 VIN (V) 2.5 2.5 100 60 1 POWER LOSS 50 40 0.1 VIN = 3V VIN = 2.4V VIN = 1.2V 30 20 0.01 CHANGE IN VOUT (%) EFFICIENCY (%) EFFICIENCY POWER LOSS (mW) 10 0.1 1 10 LOAD (mA) 100 0.01 1000 1.5 1.5 1.0 1.0 0.5 COUT = 22F 0 COUT = 10F -0.5 -1.0 10 20 30 40 50 LOAD (mA) 60 0 20 40 60 80 100 120 140 160 180 LOAD (mA) 3525d33 G07 25 COUT = 10F COUT = 22F Start-Up Delay Coming Out of Shutdown 120 100 SWITCHING DELAY (s) 0.20 CHANGE IN VOUT (%) 30 1 LOAD (mA) -2.5 80 VOUT Variation vs Temperature (Normalized to 25C) 0.30 0.1 70 3525d33 G06 35 0.10 -0.00 -0.10 -0.20 3525d33 G12 -0.40 -50 80 60 40 20 -0.30 10 4.5 COUT = 10F -1.0 -2.0 0.40 5 -0.5 -1.5 0 4.0 COUT = 22F 0 -2.0 40 10 0.5 -1.5 -2.5 Light Load Burst Frequency vs Load 15 3.5 VIN = 2.4V 2.0 3525d33 G04 20 2.5 3.0 VIN (V) Load Regulation 2.5 VIN = 1.2V 2.0 90 80 2.0 3525d33 G03 Load Regulation 100 1.5 3525d33 G02 Efficiency and Power Loss vs Load 70 0 1.0 3.0 CHANGE IN VOUT (%) 1.0 0 3525d33 G01 BURST FREQUENCY (kHz) 20 5 0 0.5 4 25 15 50 0 30 -25 0 25 50 75 TEMPERATURE (oC) 100 125 3525d33 G13 0 1.0 1.5 2.0 2.5 3.0 VIN (V) 3.5 4.0 4.5 3525d33 G14 3525d33fb For more information www.linear.com/LTC3525D3.3 LTC3525D-3.3 Typical Performance Characteristics Output Voltage Ripple TA = 25C unless otherwise noted. Output Voltage Ripple IOUT 5mA IOUT 5mA IOUT 40mA IOUT 40mA 50mV/DIV IOUT 80mA 50mV/DIV IOUT 80mA VIN = 1.2V COUT = 10F 50s/DIV 3525d33 G16 VIN = 1.2V COUT = 22F Output Voltage Ripple 50s/DIV 3525d33 G17 50mA Load Step Response IOUT 5mA IOUT 100mA 50mV/DIV OUTPUT RIPPLE 50mV/DIV LOAD CURRENT 20mA/DIV IOUT 190mA VIN = 2.4V COUT = 22F 50s/DIV 3525d33 G18 VIN = 1.2V COUT = 22F 500s/DIV 3525d33 G21 100mA Load Step Response OUTPUT RIPPLE 50mV/DIV LOAD CURRENT 50mA/DIV VIN = 2.4V COUT = 22F 500s/DIV 3525d33 G22 3525d33fb For more information www.linear.com/LTC3525D3.3 5 LTC3525D-3.3 Pin Functions SHDN (Pin 1): Logic-Controlled Shutdown Input. Connect to a voltage >1V to enable the LTC3525D. Connect to a voltage <0.4V to disable the LTC3525D and connect VIN to VOUT through the inductor. GND (Pins 2, 5): Ground. VIN (Pin 3): Input Voltage. The LTC3525D is powered from VIN until VOUT exceeds VIN. Once VOUT is greater than (VIN + 0.2V typical), it is powered from VOUT. Place a ceramic bypass capacitor from VIN to GND. A minimum value of 1F is recommended. 6 VOUT (Pin 4): Output Voltage Sense and the Output of the Synchronous Rectifier. Connect the output filter capacitor from VOUT to GND, close to the IC. A minimum value of 10F ceramic is recommended. Use 22F for reduced output ripple. The pass-through mode feature connects VOUT to VIN through the inductor when SHDN is <0.4V. SW (Pin 6): Switch Pin. Connect an inductor from this pin to VIN. An internal antiringing resistor is connected across SW and VIN after the inductor current has dropped to zero to minimize EMI. 3525d33fb For more information www.linear.com/LTC3525D3.3 LTC3525D-3.3 Block Diagram SW VIN 6 3 VOUT VSEL VBEST WELL SWITCH VB 4 VOUT SHUTDOWN SHUTDOWN GATE DRIVERS AND ANTI-CROSS CONDUCTION + OFFSET VREF UVLO - ADJUST VREF + - IPK UVLO + IPK COMPARATOR START-UP LOGIC IVAL SHUTDOWN IVALLEY COMPARATOR TSD - ADJUST + - THERMAL SHUTDOWN OFFSET + - SHDN 1 WAKE INTEGRATOR FB VREF SLEEP COMPARATOR ADJUST 5 2 GND GND 3525d33 BD 3525d33fb For more information www.linear.com/LTC3525D3.3 7 LTC3525D-3.3 Operation The LTC3525D is a high performance Burst Mode operation only, synchronous boost converter requiring only three small external components. Its simplicity and small size make it a high efficiency alternative to charge pump designs. It is designed to start up from a single alkaline or nickel cell, with input voltages as low as 0.85V, or from two or three cells (or a Li-Ion battery), with voltages as high as 4.5V. Once started, VIN can be as low as 0.5V (depending on load current) and maintain regulation. The output voltage is preset internally to 3.3V. Peak switch current is 400mA minimum, providing regulation with load currents up to 150mA, depending on input voltage. in some applications. Therefore, in applications where SHDN may be driven above VIN, a resistor divider or other means must be employed to keep the SHDN voltage below (VIN + 0.4V) to prevent the possibility of the test mode being engaged. Please refer to Figure 1 for two possible implementations. Synchronous rectification provides high efficiency operation while eliminating the need for an external Schottky diode. When the LTC3525D is in shutdown, the internal Pchannel MOSFET switch is turned on. This allows VIN to be connected to VOUT through the inductor in shutdown, creating a pass-through mode. The LTC3525D can maintain regulation with an input voltage equal to or greater than VOUT. Note, however, that the synchronous rectifier is not enabled in this mode, resulting in lower efficiency and reduced output current capability. The operating quiescent current is only 7A typical, allowing the converter to maintain high efficiency at extremely light loads. Shutdown The LTC3525D is shut down by pulling SHDN below 0.4V, and made active by raising it above 1V. Although SHDN can be driven above VIN or VOUT (up to the absolute maximum rating) without damage, the LTC3525D has a proprietary test mode that may be engaged if SHDN is held in the range of 0.5V to 1V higher than the greater of VIN or VOUT. If the test mode is engaged, normal PWM switching action is interrupted, which can cause undesirable operation LTC3525D-3.3 After the SHDN pin rises, there is a short delay before switching starts. The delay is 20s to 120s, depending on input voltage (see Typical Performance Characteristics curve). Pass-Through Mode Start-up A start-up oscillator allows the LTC3525D to start with input voltages as low as 1V. It remains in start-up mode until two conditions are met. VOUT must exceed VIN by at least 0.2V typical and either VIN or VOUT must be greater than 1.8V typical. During start-up, the synchronous rectifier is not enabled, and the internal P-channel synchronous rectifier acts as a follower, causing the peak voltage on SW to reach (VIN + 1V) typical. This limits inrush current by maintaining control of the inductor current when VOUT is less than VIN. To reduce power dissipation in the P-channel synchronous rectifier when the output is shorted, a foldback feature is incorporated that reduces the peak inductor current when VIN is more than 1.7V greater than VOUT. VIN SHDN SHDN VCNTRL LTC3525D-3.3 3525d33 F01 R 1M VCNTRL ZETEX ZC2811E 1M R > (VCNTRL/(VIN + 0.4) - 1) M Figure 1 8 3525d33fb For more information www.linear.com/LTC3525D3.3 LTC3525D-3.3 Operation Normal Operation Once VOUT has increased more than 0.2V typical above VIN, and either voltage is above 1.8V, normal operation begins, with synchronous rectification enabled. In this mode, the internal N-channel MOSFET connected between SW and GND stays on until the inductor current reaches a maximum peak value, after which it is turned off and the P-channel synchronous rectifier is turned on. It stays on, delivering current to the output, until the inductor current has dropped below a minimum value at which point it turns off and the cycle repeats. When the output voltage reaches its regulated value both switches are turned off and the LTC3525D goes to sleep, during which time the output capacitor supplies current to the load. Once the output voltage drops approximately 9mV below the regulation value the IC leaves sleep mode and switching is resumed. The LTC3525D has been designed for low output voltage ripple. The output voltage ripple is typically only 20mV peak-to-peak at light load and 60mV peak-to-peak at full load using the minimum recommended 10F output capacitor. An anti-ring circuit damps any oscillation at the switch node when the inductor current falls to zero. Power Adjust Feature The LTC3525D incorporates a feature that maximizes efficiency at light load while providing increased power capability at heavy load by adjusting the peak and valley of the inductor current as a function of load. Lowering the peak inductor current to 150mA at light load optimizes efficiency by reducing conduction losses in the internal MOSFET switches. As the load increases, the peak inductor current is automatically increased to a maximum of 400mA. At intermediate loads, the peak inductor current may vary from 150mA to 400mA. Figure 2 shows an example of how the inductor current changes as the load increases. Please note that output capacitor values greater than 47F will result in higher peak currents than necessary at light load. This will lower the light load efficiency. The valley of the inductor current is automatically adjusted as well, to maintain a relatively constant inductor ripple current. This keeps the switching frequency relatively constant. The maximum average load current that can be supported is given by: IO(MAX ) = 0.3 * VIN * Amps VO where is the efficiency (see Typical Performance Characteristics). The "burst" frequency (how often the LTC3525D delivers a burst of current pulses to the load) is determined by the internal hysteresis (output voltage ripple), the load current and the amount of output capacitance. All Burst Mode operation or hysteretic converters will enter the audible frequency range when the load is light enough. However, due to the low peak inductor current at light load, circuits using the LTC3525D does not typically generate any audible noise. INDUCTOR CURRENT 100mA/DIV LOAD CURRENT 50mA/DIV 10s/DIV 3525d33 F02 Figure 2. Inductor Current Changing as a Function of Load 3525d33fb For more information www.linear.com/LTC3525D3.3 9 LTC3525D-3.3 Operation Component Selection Inductor values between 4.7H and 15H are recommended. In most applications 10H will yield the best compromise between size and efficiency. The inductor should be a low loss ferrite design and must be rated for peak currents of at least 400mA without saturating. Inductors with lower DC resistance will improve efficiency. Note that the inductor value does not have a significant effect on ripple current, so while lower values will increase the operating frequency, they do not reduce output voltage ripple. Some recommended inductor examples are Murata LQH32C, Coilcraft LPO4812, LPO3310, DO3314, DS1608 and MSS4020, Sumida CDRH2D14 and Taiyo Yuden NR3015T. A ceramic input bypass capacitor should be located as close as possible to the VIN and GND pins of the IC. A minimum value of 1F is recommended. If the battery is more than a few inches away, a bulk tantalum decoupling cap of at least 10F is recommended on VIN. The output capacitor should also be a ceramic, located close to the VOUT and GND pins. A minimum value of 10F is recommended. Increasing the value of the output capacitor to 22F will result in lower output ripple. Higher capacitor values will only offer a small reduction in output ripple, while reducing light load efficiency by causing the peak inductor current to increase above its minimum value of 150mA. The input and output capacitors should be X5R or X7R types, not Y5V. Table 1. Inductor Vendor Information SUPPLIER PHONE FAX WEBSITE Murata USA: (814) 237-1431 USA: (814) 238-0490 www.murata.com Coilcraft (847) 639-6400 (847) 639-1469 www.coilcraft.com Sumida USA: (847) 956-0666 USA: (847) 956-0702 www.sumida.com Taiyo Yuden (408) 573-4150 (408) 573-4159 www.t-yuden.com TOKO (847) 297-0070 (847) 699-7864 www.toko.co.jp/products/en TDK (847) 699-2299 (847) 803-6296 www.tdk.com Wurth (605) 886-4385 (605) 886-4486 www.we-online.com Table 2. Capacitor Vendor Information SUPPLIER PHONE FAX WEBSITE Murata USA: (814) 237-1431 USA: (814) 238-0490 www.murata.com Taiyo Yuden (408) 573-4150 (408) 573-4159 www.t-yuden.com TDK (847) 803-6100 (847) 803-6296 www.component.tdk.com AVX (803) 448-9411 (803) 448-1943 www.avxcorp.com SHDN SHDN SW LTC3525D-3.3 VIN GND GND VIN VOUT VOUT 3525d33 F03 Figure 3. Recommended Component Placement 10 3525d33fb For more information www.linear.com/LTC3525D3.3 LTC3525D-3.3 Typical Applications Single Alkaline or NiMH to 3.3V Converter with 1mm Profile 6.8H* 1V TO 1.6V 3 PASS THROUGH ON 1 2 1F *COILCRAFT XPL2010-682ML **MURATA GRM219R60J106KE191D LTC3525D-3.3 VIN SW SHDN VOUT GND GND 6 VOUT 3.3V 60mA 4 5 10F** 6.3V 3525d33 TA04 3525d33fb For more information www.linear.com/LTC3525D3.3 11 LTC3525D-3.3 Package Description SC6 Package 6-Lead Plastic SC70 (Reference LTC DWG # 05-08-1638 Rev B) 0.47 MAX 0.65 REF 1.80 - 2.20 (NOTE 4) 1.00 REF INDEX AREA (NOTE 6) 1.80 - 2.40 1.15 - 1.35 (NOTE 4) 2.8 BSC 1.8 REF PIN 1 RECOMMENDED SOLDER PAD LAYOUT PER IPC CALCULATOR 0.10 - 0.40 0.65 BSC 0.15 - 0.30 6 PLCS (NOTE 3) 0.80 - 1.00 1.00 MAX 0.00 - 0.10 REF GAUGE PLANE 0.15 BSC 0.26 - 0.46 0.10 - 0.18 (NOTE 3) SC6 SC70 1205 REV B NOTE: 1. DIMENSIONS ARE IN MILLIMETERS 2. DRAWING NOT TO SCALE 3. DIMENSIONS ARE INCLUSIVE OF PLATING 4. DIMENSIONS ARE EXCLUSIVE OF MOLD FLASH AND METAL BURR 5. MOLD FLASH SHALL NOT EXCEED 0.254mm 6. DETAILS OF THE PIN 1 IDENTIFIER ARE OPTIONAL, BUT MUST BE LOCATED WITHIN THE INDEX AREA 7. EIAJ PACKAGE REFERENCE IS EIAJ SC-70 8. JEDEC PACKAGE REFERENCE IS MO-203 VARIATION AB 12 3525d33fb For more information www.linear.com/LTC3525D3.3 LTC3525D-3.3 Revision History REV DATE DESCRIPTION PAGE NUMBER A 09/10 Updated "Shutdown" section 6 B 04/15 Added table to reference other LTC3525 family parts 1 Changed Operating Temperature Range to Operating Junction Temerature Range and changed the Operating Temperature Range from 85C to 125C in the Absolute Maximum Ratings 2 Updated Order Information table 2 Changed Operating Temperature Range to Operating Junction Temperature Range and added Note 2 to the Electrical Characteristics section 3 Updated Note 2 for addition of I Grade 3 Updated VOUT Variation vs Temperature curve 4 Updated Inductor Vendor Information in Table 1 10 Updated Inductor information 11 Added Typical Application circuit 14 Modified Related Parts table 14 3525d33fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. For more information www.linear.com/LTC3525D3.3 13 LTC3525D-3.3 Typical Application 2-Alkaline or NiMH to 3.3V 10H* 1.8V TO 3.2V PASS THROUGH ON 3 1 2 1F LTC3525D-3.3 VIN SW SHDN VOUT GND GND *SUMIDA 252012CDMCQDS-100MC 6 VOUT 3.3V 140mA 4 5 10F 3525d33 TA05 Related Parts PART NUMBER DESCRIPTION COMMENTS LTC3400/LTC3400B 600mA (ISW), 1.2MHz, Synchronous Step-Up DC/DC Converter 92% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5V, IQ = 19A/300A, ISD < 1A, ThinSOT Package LTC3401 1A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38A, ISD < 1A, MS Package LTC3402 2A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter 97% Efficiency, VIN: 0.5V to 5V, VOUT(MAX) = 5.5V, IQ = 38A, ISD < 1A, MS Package LTC3421 3A (ISW), 3MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect 95% Efficiency, VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 12A, ISD < 1A, QFN-24 Package LTC3429/LTC3429B 600mA, 500kHz Single/Dual Cell Micropower Synchronous Boost Converter with Output Disconnect 95% Efficiency, VIN: 1V to 4.5V, VOUT(MAX) = 5V, IQ = 20A, ISD < 1A, SC70 Package LTC3458 1.4A (ISW), 1.5MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect VIN: 1.5V to 6V, VOUT(MAX) = 7.5V, ISD < 1A, 3mm x 4mm DFN Package LTC3458L 1.7A (ISW), 1.5MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect VIN: 1.5V to 6V, VOUT(MAX) = 6V, ISD <1 A, 3mm x 4mm DFN Package LTC3459 60mA, 10V Micropower Synchronous Boost Converter 95% Efficiency, VIN: 1.5V to 6V, VOUT(MAX) = 10V, IQ =10A, ISD < 1A, ThinSOT Package LT3464 85mA (ISW), High Efficiency Step-Up DC/DC Converter with Integrated Schottky and PNP Disconnect VIN: 2.3V to 10V, VOUT(MAX) = 34V, IQ = 25A, ISD < 1A, ThinSOT Package LT3427 500mA (ISW), 1.2MHz, Step-Up DC/DC Converter with Output VIN: 1.8V to 5V, VOUT(MAX) = 5V, ISD < 1A, Disconnect 2mm x 2mm DFN Package LTC3525-3/LTC3525-3.3/ 400mA Synchronous Step-Up DC/DC Converter with Output LTC3525-5 Disconnect VIN: 0.5V to 4.5V, VOUT(MAX) = 5V, IQ = 7A, ISD < 1A, SC70 Package LTC3526/LTC3526B 500mA. 1MHz, Synchronous Step-Up DC/DC Converter with Output Disconnect VIN: 0.5V to 4.5V, VOUT(MAX) = 5.25V, IQ = 9A, ISD < 1A, 2mm x 2mm DFN-6 Package LTC3528/LTC3528B 1A, 1MHz Synchronous Step-Up DC/DC Converter with Output Disconnect 94% Efficiency, VIN Start-Up Voltage: 700mV, VOUT(MAX) = 5.25V, IQ = 12A, ISD < 1 A, 2mm x 3mm DFN Package LTC3529 1.5A, 1.5MHz, Synchronous Step-Up DC/DC Converter 95% Efficiency, VIN: 1.8V to 5.25V, VOUT(MAX) = 5.15V, ISD < 1A, 2mm x 3mm DFN Package LTC3539/LTC3539-2 2A, 1MHz/2MHz Synchronous Step-Up DC/DC Converter 94% Efficiency, VIN Start-Up Voltage: 700mV, VOUT(MAX) = 5.25V, IQ = 12A, ISD < 1 A, 2mm x 3mm DFN Package 14 3525d33fb Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 For more information www.linear.com/LTC3525D3.3 (408) 432-1900 FAX: (408) 434-0507 www.linear.com/LTC3525D3.3 LT 0415 REV B * PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 2006