LT3653

FEATURES n LT3653 1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications DESCRIPTION The LT®3653 is a monolithic current mode PWM step-down regulator with programmable output current limit. Typically, it is used with battery charger power path controllers to pre-regulate the output and optimize the battery charger efficiency. Output current limit provides accurate control over system power dissipation. The wide operating input voltage range of 7.5V to 30V suits the LT3653 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power. Input overvoltage protection allows the LT3653 to handle 60V input transients. The LT3653 control pin, VC , is available for external battery tracking control, Bat-Track. The LT3653 will block output discharge during an open or shorted input. The HVOK pin indicates that the internal bias supplies are present and no faults have occurred (i.e., overtemperature and input overvoltage and undervoltage). The LT3653 includes a 1.5MHz frequency oscillator, internal compensation, and an internal boost diode to minimize the number of external components. The LT3653 is available in an 8-lead (2mm × 3mm) package with exposed pads for low thermal resistance. n n n n n n n Wide Input Range: – Operation from 7.5V to 30V – Overvoltage Lockout Protects Circuit Through 60V Transients Operates with LTC Bat-Track™ Li-Ion Battery Chargers to Maximize Efficiency No Reverse Discharge Path from VOUT to VIN Programmable Output Current Limit Integrated BOOST Diode Thermal Protection Small Application Size Thermally Enhanced 2mm × 3mm DFN Package APPLICATIONS n n n n Battery Powered Equipment Portable USB Devices – Cameras, MP3 Players, PDAs Automotive Battery Regulation Multiple-Source Battery Chargers , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Bat-Track is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION High Voltage Single-Cell Battery Charger Application VIN 7.5V TO 30V TRANSIENT TO 60V 0.1μF VIN 4.7μF LT3653 ISENSE ILIM 27.4k HVOK GND VC 3653 TA01a Efficiency vs Load Current 100 90 4.7μH 1.2A SYSTEM LOAD EFFICIENCY (%) 80 70 60 50 40 0.1 VIN = 24V BOOST SW VIN = 8V VIN = 12V VOUT 10μF OUT WALL LTC4098 VC BAT + SINGLE-CELL Li-Ion 0.3 0.7 0.5 0.9 OUTPUT CURRENT(A) 1.1 1.3 3653 TA01a 3653f 1 LT3653 ABSOLUTE MAXIMUM RATINGS (Note 1) PIN CONFIGURATION TOP VIEW VIN 1 HVOK 2 VC 3 ILIM 4 9 8 SW 7 BOOST 6 ISENSE 5 VOUT Input Voltage (VIN) (Note 3) ......................................60V Boost Pin Voltage (BOOST).......................................50V Boost Pin Above SW Pin ...........................................25V HVOK, VOUT, ISENSE Pins .............................................6V VC Pin .........................................................................3V Operating Junction Temperature Range (Notes 2, 5) LT3653E .............................................–40°C to 125°C LT3653I ..............................................–40°C to 125°C Storage Temperature..............................–65°C to 150°C DCB PACKAGE 8-LEAD (2mm 3mm) PLASTIC DFN θJA = 64°C/W, θJC = 10°C/W EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH LT3653EDCB#PBF LT3653IDCB#PBF TAPE AND REEL LT3653EDCB#TRPBF LT3653IDCB#TRPBF PART MARKING* LDJN LDJN PACKAGE DESCRIPTION 8-Lead (2mm × 3mm) Plastic DFN 8-Lead (2mm × 3mm) Plastic DFN TEMPERATURE RANGE –40°C to 125°C –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. 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/ The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C; VIN = 12V, VBOOST = 17V, VSW = 0V, RILIM = 33.2k, unless otherwise noted. PARAMETER VIN Operating Range VIN Undervoltage Lockout VIN Undervoltage Hysteresis VIN Overvoltage Lockout VIN Overvoltage Lockout Hysteresis VIN Supply Current VOUT Reverse Leakage Current VOUT Nominal Set Point VOUT Current Limit Range VOUT Current Limit Operating Frequency VC Source Current VC Sink Current VC Switching Threshold VOUT = 0V, VC = 1.5V VOUT = 5V, VC = 1.5V IOUT = 0mA RILIM = 33.2k Not Switching VIN = 0V, VOUT = 4.8V VIN = Open, VOUT = 4.8V VC Pin = Open l l l ELECTRICAL CHARACTERISTICS CONDITIONS MIN l TYP 7 500 33 1 2.8 MAX 30 7.5 36 3.4 1 1 UNITS V V mV V V mA μA μA V A A A kHz μA μA V 7.5 6.5 30 Rising Rising 4.8 0.4 0.85 0.80 1350 1 1 1500 12 10 1.1 5 1.2 1.15 1.2 1650 3653f 2 LT3653 ELECTRICAL CHARACTERISTICS PARAMETER VC Clamp Voltage Switch Peak Current Limit Switch VCESAT Boost Diode Drop Boost Pin Current HVOK Output Voltage High HVOK Output Voltage Low CONDITIONS VOUT = 0V (Note 4) ISW = 1A IDIODE = 60mA ISW = 1A IHVOK = 1mA IHVOK = –2μA l l The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C; VIN = 12V, VBOOST = 17V, VSW = 0V, RILIM = 33.2k, unless otherwise noted. MIN TYP 1.75 2 275 0.9 28 4 4.4 5 0.25 1.2 MAX UNITS V A mV V mA V V 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 LT3653E is guaranteed to meet performance specifications from 0°C to 125°C. Specifications over the –40°C to 125°C operating temperature range are assured by design, characterization, and correlation with statistical process controls. The LT3653I specifications are guaranteed over the full –40°C to 125°C temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 3: Absolute Maximum Voltage at VIN pin is 60V for non-repetitive 1 second transients. Note 4: Switch Peak Current Limit guaranteed by design and/or correlation to static test. Note 5: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Junction temperature will exceed the maximum operating junction temperature when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability. 3653f 3 LT3653 TYPICAL PERFORMANCE CHARACTERISTICS Switch Voltage Drop 400 350 SWITCHING FREQUENCY (MHz) SWITCH VOLTAGE DROP (mV) 300 250 200 150 100 50 0 0 0.2 0.4 0.6 0.8 SWITCH CURRENT (A) 1 1.2 3653 G01 TA = 25°C unless otherwise noted Switching Frequency 125ºC 25ºC 1.7 1.6 INPUT VOLTAGE (V) 1.5 1.4 1.3 1.2 1.1 1.0 –50 8.0 7.5 Undervoltage Lockout RISING 7.0 6.5 6.0 5.5 5.0 4.5 -25 0 25 50 75 TEMPERATURE (ºC) 100 125 4.0 –50 -25 0 25 50 75 100 125 150 TEMPERATURE (ºC) 3653 G03 –45ºC FALLING 3653 G02 Output Current Limit 1.2 RILIM = 33.2k 1.15 OUTPUT VOLTAGE (V) 1.1 CURRENT LIMIT (A) 1.05 1 0.95 0.9 0.85 0.8 –50 –25 0 25 50 75 TEMPERATURE (ºC) 100 125 1 0 5 4 3 2 6 Output Current Limit RILIM = 27.4k 35 VIN Overvoltage Lockout RISING INPUT VOLTAGE (V) 33 FALLING 31 29 27 25 –50 0 0.2 0.4 0.6 0.8 1 OUTPUT CURRENT (A) 1.2 1.4 –25 0 25 50 75 TEMPERATURE (ºC) 100 125 3653 G04 3653 G05 3653 G06 BOOST Pin Current 35 30 BOOST PIN CURRENT (mA) BOOST DIODE VF (V) 25 20 15 10 5 0 1.4 1.2 1 0.8 0.6 0.4 0.2 0 Boost Diode VF 0 0.2 0.4 0.5 0.8 SWITCH CURRENT (A) 1 1.2 3653 G07 0 50 100 150 200 DIODE CURRENT (mA) 250 300 3653 G08 3653f 4 LT3653 TYPICAL PERFORMANCE CHARACTERISTICS VC Current 15 10 VC PIN CURRENT (μA) 5 0 –5 –10 –15 –20 –25 4 4.4 4.8 5.2 VOUT (V) 5.6 6 3653 G09 TA = 25°C unless otherwise noted VC Operating Range 2.0 1.8 1.6 VC VOLTAGE (V) 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 -50 -25 0 25 50 75 TEMPERATURE (ºC) 100 125 SWITCHING THRESHOLD CURRENT LIMIT CLAMP 3653 G10 PIN FUNCTIONS VIN (Pin 1): The VIN pin supplies current to the LT3653’s internal regulator and the internal power switch. Locally bypass this pin with a capacitor. HVOK (Pin 2): The HVOK pin is a status pin which indicates that the internal bias rail is present and that an input undervoltage lockout fault, an overvoltage lockout fault or an over temperature fault are not present. VC (Pin 3): The VC pin is the output of the internal error amplifier and is internally compensated. The voltage on this pin controls the peak switch current. Connect this pin to the battery charger VC pin for battery tracking function. ILIM (Pin 4): Connect a resistor to GND to program the output current limit of the regulator. See the ILIM Resistor section in Application Information. VOUT (Pin 5): The VOUT pin is connected to the negative terminal of the internal current sense resistor of the output current limit circuit. Maximum VOUT voltage is regulated to 4.8V. ISENSE (Pin 6): The ISENSE pin is the positive input to the internal current sense resistor of the output current limit circuit. The ISENSE pin is also the anode of the internal BOOST diode. BOOST (Pin 7): The BOOST pin provides a drive voltage, higher than the input voltage, to the internal power switch. The BOOST pin is internally connected to the cathode of the BOOST diode. SW (Pin 8): The SW pin is the output of the internal power switch. Connect this pin to the inductor, catch diode and boost capacitor. Exposed Pad (Pin 9): Ground. The Exposed Pad must be soldered to the PCB and electrically connected to ground. Use a large ground plane and vias to optimize thermal performance. 3653f 5 LT3653 BLOCK DIAGRAM LT3653 VIN C1 C3 VIN RSENSE1 Q1 SW L1 D1 INTERNAL BIAS REGULATORS, REFERENCE, UVLO AND OVP 5V FAULT G2 ILIM R1 TO CHARGER VC INTERNAL COMPENSATION G1 EXPOSED PAD GND 3653 BD 6 – TO CHARGER HVOK + – + – A1 BOOST + R Q + – OSCILLATOR AND SLOPE COMPENSATION DRIVER D2 ISENSE S + RSENSE2 – VOUT C2 SYSTEM LOAD FB BATTERY CHARGER + 0.8V 2.5V REGULATOR SINGLE-CELL Li-Ion 3653f LT3653 OPERATION Please refer to the Block Diagram. The LT3653 is specifically tailored for use with a battery charger power path controller. The LT3653 regulates the high voltage input to a lower voltage to provide power to the system load and to the single-cell Li-Ion battery charger. High efficiency in the battery charger is achieved by keeping the voltage across it low. To accomplish this, the battery charger takes control of the LT3653 regulator control node, VC , and overrides the error amp, G1. The output voltage is regulated by the battery charger to a voltage slightly above the battery, typically 300mV. HVOK is a status pin which indicates to the charger that a high voltage input is present and that the LT3653 is ready to start providing power to the system load. When the HVOK pin is low, the LT3653 is not switching and the system output is not supported by the LT3653 regulator. The LT3653 is a constant frequency, current mode step down regulator. A switch cycle is initiated when the 1.5MHz oscillator enables the RS flip flop, turning on the internal power switch, Q1. The sense amplifier (A1) monitors the switch current via the voltage dropped across the current sense resistor RSENSE1. The comparator compares the amplified current signal with the output (VC) of the error amplifier (G1). The switch is turned off when this current exceeds a value determined by the VC voltage. The error amplifier monitors the VOUT voltage through an internal resistor divider and, when not driven externally servos the VC voltage to regulate VOUT. If the VOUT voltage drops, the VC voltage will be driven higher increasing the output current and VOUT voltage. An active clamp (not shown) on the VC node provides current limit. The LT3653 is internally compensated with a pole zero combination. An external capacitor and internal diode, D2, are used to generate a voltage at the BOOST pin that is higher than the input supply. This allows the driver to fully saturate the internal bipolar NPN power switch for efficient operation. The switch driver operates from either VIN or BOOST to ensure startup. An internal regulator provides power to the control circuitry. This regulator includes input undervoltage and overvoltage protection which disables switching action when VIN is less than 7V and greater than 33V, typical. When switching is disabled, the LT3653 safely sustains input voltages up to 60V. Note that while switching is disabled the output will discharge. Output current limiting is provided via the servo action of amplifier G2. The voltage across the sense resistor, RSENSE2 , is compared to a voltage programmed by external resistor R1 on the ILIM pin. A capacitor averages the inductor ripple current. If the averaged inductor current exceeds the programmed value then the VC voltage is pulled low, reducing the current in the regulator. The output current limit circuit allows for lower current rated power path components and provides better control of system power dissipation. 3653f 7 LT3653 APPLICATIONS INFORMATION Inductor Selection A 4.7μH inductor is recommended for most LT3653 applications. This value provides a good tradeoff between size and ripple current. The inductor’s RMS current rating must be greater than the maximum load current and its saturation current should be about 30% higher. The output current limit circuit tightly controls the maximum average inductor current therefore the inductor RMS current rating does not have to be overrated to handle short-circuit or overload conditions. For high efficiency, keep the series resistance (DCR) less than 0.1Ω. Output voltage ripple can be reduced by using a higher value inductor. The cost is a larger physical size and poorer transient response. A lower value inductor has higher ripple currents but is physically smaller or, for the same size, has lower DCR usually resulting in higher efficiency. Catch Diode The catch diode conducts current only during switch off time. Average forward current in normal operation is calculated from: ID( AVG) =IOUT VIN − VOUT VIN ILIM Resistor The LT3653 output current limit controls the maximum current delivered from the LT3653 regulator. This allows tighter control of the system power dissipation and also protects the inductor and diode from overheating during an overload or short-circuit condition. A resistor connected from the ILIM pin to GND programs the output current limit. Table 1 details the ILIM resistor values for specific desired output current limits Table 1. Output Current Limit vs RILIM Value OUTPUT CURRENT LIMIT (A) 0.4 0.6 0.8 1 1.2 RILIM VALUE (kΩ) 121 66.5 45.3 33.2 27.4 The input capacitor is required to reduce the resulting voltage ripple at the LT3653 and to force this very high frequency switching current into a tight local loop, minimizing EMI. Place the capacitor in close proximity to the LT3653 and the catch diode (see the PCB Layout section). Output Capacitor A 10μF or greater ceramic capacitor is required for low output ripple and good transient response. Ceramic capacitors have very low equivalent series resistance (ESR) and provide the best ripple performance. Use X5R or X7R types and keep in mind that a ceramic capacitor biased with VOUT has less than its nominal capacitance. High performance electrolytic capacitors can be used for the output capacitor. Low ESR is important, so choose one that is intended for use in switching regulators. Keep the ESR less than 0.1Ω. where IOUT is the maximum output load current programmed by the ILIM resistor. Peak reverse voltage is equal to the regulator input voltage. Use a Schottky diode with a reverse voltage rating greater than the maximum input voltage. The overvoltage protection feature in the LT3653 keeps the switch off when VIN > 33V (typical), allowing the use of a 40V rated Schottky, even when VIN ranges up to 60V. Input Capacitor Bypass the input of the LT3653 circuit with a 4.7μF or higher value ceramic capacitor of X7R or X5R type. Y5V types have poor performance over temperature and applied voltage and should not be used. If the input power source has high impedance, or there is significant inductance due to long wires or cables, additional bulk capacitance may be necessary. This can be provided with a low performance electrolytic capacitor. Step-down regulators draw current from the input supply in pulses with very fast rise and fall times. Boost Capacitor Selection The boost capacitor is calculated with the following formula: CBOOST = (IOUT(MAX ) ) • VOUT 0.1V • 30 • VIN •1.5MHz 3653f Typically, a 0.1μF capacitor is used. 8 LT3653 APPLICATIONS INFORMATION Battery Charger Operation Connect the control node, VC pin, of the LT3653 to the VC pin of the battery charger power path controller. The VC node is internally clamped; however, take care not to overdrive the pin. The LT3653 is internally compensated with a pole zero combination on the output of the gm amplifier, G1. Check stability over the full input voltage range, output load range and temperature. Connect the HVOK node of the LT3653 to the high voltage present pin of the charger. This is the WALL pin on the LTC4098. The HVOK pin is capable of supplying up to 1mA of drive current. When the HVOK pin is low the LT3653 is not switching and the system output cannot be supported by the LT3653 regulator. See the Typical Applications section for different configurations. PCB Layout Proper operation and minimum EMI requires a careful printed circuit board layout. Figure 1 shows the recommended component placement with trace, ground plane and via locations. Note that large, switched currents flow in the LT3653’s VIN and SW pins, the catch diode (D1) and the input capacitor (C1). Keep the loop formed by these components as small as possible and tied to system ground in only one place. Place these components, along with the inductor and output capacitor, on the same side of the circuit board, with their connections made on that layer. Place a local, unbroken ground plane below these VIN C1 GND components, and tie this ground plane to system ground at one location, ideally at the ground terminal of the output capacitor C2. Make the SW and BOOST nodes as short as possible. Include vias near the exposed GND pad of the LT3653 to help remove heat from the LT3653 to the ground plane. High Temperature Considerations The die temperature of the LT3653 must not exceed the maximum rating of 125°C. This is generally not a concern unless the ambient temperature is above 85°C. For higher temperatures, take care in the layout of the circuit to ensure good heat sinking of the LT3653. Derate the maximum load current as the ambient temperature approaches 125°C. The die temperature is calculated by multiplying the LT3653 power dissipation by the thermal resistance from junction to ambient. Power dissipation within the LT3653 is estimated by calculating the total power loss from an efficiency measurement and subtracting the catch diode loss. Thermal resistance depends on the layout of the circuit board, but 64°C/W is typical for the (2mm × 3mm) DFN (DCB) package. Other Linear Technology Publications Application Notes 19, 35 and 44 contain more detailed descriptions and design information for Buck regulators and other switching regulators. The LT1376 data sheet has a more extensive discussion of output ripple, loop compensation and stability testing. TO CHARGER: HVOK VC 1 2 3 4 C2 RILIM 8 7 6 5 C3 VOUT 3653 F01 Figure 1. LT3653 PCB Layout 3653f 9 LT3653 TYPICAL APPLICATION Dual Input High Efficiency Battery Charger and Triple Buck PMIC Application BOOST HIGH VOLTAGE INPUT 7.5V TO 30V TRANSIENT TO 60V C1 4.7μF 50V VIN VBUS SW LT3653 ISENSE C3 0.1μF 10V D1 L1 4.7μH ILIM R1 27.4k VC GND D3 MBR0520 VC USB WALL ADAPTER VOUT HVOK SYSTEM LOAD C2 10μF 6.3V M2 Si2333DS WALL ACPR C5 2.2μF VBUS C2 10μF R2 2.1k CLPROG R3 2k PROG R14 100k VNTC R15 NTC 100k NTC BVIN2 C6 2.2μF BVIN1 VOUT IDGATE BAT R13 510k D2 M1 (OPTIONAL) BAT SINGLE-CELL Li-Ion 3.3V 25mA ALWAYS-ON VOUT1 3.3V 600mA C3 10μF 6.3V CHRG LDO3V3 LTC3557 L2 3.3μH SW1 C7 10pF FB1 L3 4.7μH SW3 C9 10pF FB3 R8 806k R9 649k R7 R6 1.02M 324k C13 1μF ILIM0 ILIM1 PMIC CONTROL EN1 EN2 EN3 MODE C8 10μF C10 10μF VOUT3 1.8V 400mA RST2 L4 4.7μH C11 10pF R10 100k R11 232k R12 464k C12 10μF RST2 VOUT2 1.2V 400mA SW1 FB1 GND 3653 TA02 L1 = COILCRAFT, MSS6132-472MLC M1 = VISHAY, Si 2333DS D1 = DIODES INC., DFLS240 3653f 10 LT3653 PACKAGE DESCRIPTION DCB Package 8-Lead Plastic DFN (2mm × 3mm) (Reference LTC DWG # 05-08-1718 Rev A) 0.70 0.05 3.50 0.05 2.10 0.05 1.35 0.05 1.65 0.05 PACKAGE OUTLINE 0.25 0.45 BSC 1.35 REF 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED R = 0.115 TYP 5 2.00 0.10 (2 SIDES) 0.40 8 0.10 R = 0.05 TYP 1.35 0.10 3.00 0.10 (2 SIDES) PIN 1 BAR TOP MARK (SEE NOTE 6) 4 0.200 REF 0.75 0.05 1.35 REF BOTTOM VIEW—EXPOSED PAD 0.00 – 0.05 NOTE: 1. DRAWING IS NOT A JEDEC PACKAGE OUTLINE 2. DRAWING NOT TO SCALE 3. ALL DIMENSIONS ARE IN MILLIMETERS 4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE 5. EXPOSED PAD SHALL BE SOLDER PLATED 6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE 1 0.23 0.45 BSC 0.05 1.65 0.10 PIN 1 NOTCH R = 0.20 OR 0.25 45 CHAMFER (DCB8) DFN 0106 REV A 3653f 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. 11 LT3653 TYPICAL APPLICATION Dual Input High Efficiency Battery Charger with Low Battery Start-Up and 1.2A Output Current Limit HIGH VOLTAGE INPUT 7.5V TO 30V TRANSIENT TO 60V BOOST C1 4.7μF 50V R1 27.4k C4 10μF 6.3V R4 6.04k L1 = TDK, VLCF5020T-4R7NIR7-1 L2 = COILCRAFT, LPS4018-332MLC M1 = VISHAY, Si 2333DS D1 = DIODES INC., DFLS240 TO UC TO UC VIN SW LT3653 ISENSE HVOK VOUT WALL SW VOUT IDGATE OVSENS D0 - D2 CHRG NTC CLPROG R2 3.01k BAT BATSENS GND 3653 TA03 C3 0.1μF 10V D1 L1 4.7μH ILIM VC VBUS VC GND USB WALL ADAPTER L2 3.3μH SYSTEM LOAD C2 22μF 6.3V OVGATE LTC4098 M1 (OPTIONAL) SINGLE-CELL Li-Ion PROG R3 1k SEE THE LTC4098 DATASHEET FOR MORE INFORMATION ON CONFIGURING THE NTC BATTERY TEMPERATURE QUALIFICATION OR REDUCED IDEAL DIODE IMPEDANCE. C5 0.1μF RELATED PARTS PART NUMBER LT1939 LT3480 DESCRIPTION Dual 25V, 2A (IOUT), 2.5MHz, High Efficiency DC/DC Converter and LDO Controller 36V with Transient Protection to 60V, 2A (IOUT), 2.4MHz, High Efficiency Step-Down DC/DC Converter with Burst Mode Operation 36V, 40VMAX, 2A, 2.5MHz High Efficiency DC/DC Converter and LDO Controller 36V with Transient Protection to 40V, 1.4A (IOUT), 3MHz, High Efficiency Step-Down DC/DC Converter 36V, Triple 2.5MHz, 2.4A + 1.5A + 1.5A I(IOUT) and LDO Controller 36V with Transient Protection to 40V, Dual 1.4A (IOUT), 3MHz, High Efficiency Step-Down DC/DC Converter USB Power Manager with Li-Ion/Polymer Charger, Triple Synchronous Buck Converter + LDO 36V, 3.5A (IOUT) 2.4MHz, High Efficiency Step-Down DC/DC Converter 36V with Transient Protection to 60V, 2A (IOUT), 2.4MHz, High Efficiency Step-Down DC/DC Converter High Voltage USB Power Manager with Ideal Diode Controller and High Efficiency Li-Ion Battery Charger COMMENTS VIN: 3.6V to 25V, VOUT(MIN) = 0.8V, IQ = 2.5mA, ISD < 10μA, 3mm × 3mm DFN-10 Package VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-10 and TSSOP-16E Packages VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 3.7mA, ISD < 10μA, TSSOP-20E Package VIN: 3.6V to 34V, VOUT(MIN) = 0.78V, IQ = 2mA, ISD < 2μA, 3mm × 3mm DFN-8 and MSOP-8E Packages VIN: 4V to 36V, VOUT(MIN) = 0.8V, IQ = 7mA, ISD < 1μA, 5mm × 7mm QFN-38 Package VIN: 3.7V to 37V, VOUT(MIN) = 0.8V, IQ = 4.6mA, ISD < 1μA, 4mm × 4mm QFN-24 and TSSOP-16E Packages Complete Multi-Function PMIC: Linear Power Manager & Three Buck Regulators Bat-Track Adaptive Output Control, “-1” version has 4.1V Vfloat, 4mm x 4mm QFN-28 Package VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 75mA, ISD < 1mA, 3mm × 3mm DFN-10, MSOP-10E VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-24 and MSOP-10E Packages High Efficiency 1.2A Charger from 6V to 36V (40V max) Input; “-1” for 4.1V float voltage batteries; Bat-Track™ Adaptive Output Control (LTC4089); Fixed 5V Output (LTC4089-5, -1); 3mm × 6mm DFN-22 Package High Efficiency 1.2A Charger from 6V to 38V (60V max) Input Bat-Track Adaptive Output Control; “-5” has no Bat-Track; 3mm × 6mm DFN-22 Package High VIN: 38V operating, 60V transient; 66V OVP Maximizes Available Power from USB Port, Bat-Track, “Instant-ON” Operation, 3mm x 4mm UTQFN-20 Package 3653f LT3500 LT3505 LT3507 LT3508 LT3557/-1 LT3680 LT3685 LT4089/-1/-5 LT4090/-5 High Voltage USB Power Manager with Ideal Diode Controller and High Efficiency Li-Ion Battery Charger USB-Compatible Switchmode Power Manager with OVP LTC4098 Burst Mode is a registered trademark of Linear Technology Corporation.ThinSOT is a trademark of Linear Technology Corporation. 12 Linear Technology Corporation (408) 432-1900 ● FAX: (408) 434-0507 ● LT 0708 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 www.linear.com © LINEAR TECHNOLOGY CORPORATION 2008