LDJN

LT3653 LINER

Document overview

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Technical content

FEATURES

APPLICATIONS

DESCRIPTION

1.2A, HV Input Regulator with Output Current Limit for Battery Charger Applications The L T®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 effi ciency. Output current limit provides accurate control over system power dissipation. The wide operating input voltage range of 7.5V to 30V suits the L T3653 to a variety of input sources, including unregulated 12V wall adapters, 24V industrial supplies, Firewire and automotive power . Input overvoltage protec- tion allows the L T3653 to handle 60V input transients. The L T3653 control pin, V C, is available for external battery tracking control, Bat-T rack. The L T3653 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., overtem- perature and input overvoltage and undervoltage). The L T3653 includes a 1.5MHz frequency oscillator, internal compensation, and an internal boost diode to minimize the number of external components. The L T3653 is available in an 8-lead (2mm × 3mm) package with exposed pads for low thermal resistance. High Voltage Single-Cell Battery Charger Application n Wide Input Range: – Operation from 7.5V to 30V – Overvoltage Lockout Protects Circuit Through 60V Transients n Operates with L TC Bat-Track™ Li-Ion Battery Chargers to Maximize Effi ciency n No Reverse Discharge Path from VOUT to VIN n Programmable Output Current Limit n Integrated BOOST Diode n Thermal Protection n Small Application Size n Thermally Enhanced 2mm × 3mm DFN Package n Battery Powered Equipment n Portable USB Devices – Cameras, MP3 Players, PDAs n Automotive Battery Regulation n Multiple-Source Battery Chargers Effi ciency vs Load Current VIN ILIM VIN 7.5V TO 30V TRANSIENT TO 60V 0.1μF SINGLE-CELL Li-Ion 1.2A SYSTEM LOAD 10μF 4.7μH

3653 TA01a

V C 4.7μF 27.4k , 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. OUTPUT CURRENT(A) 0.1 EFFICIENCY (%) 100 0.7 VIN = 8V VIN = 24V VIN = 12V

PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS HVOK, V Operating Junction Temperature Range (Notes 2, 5) (Note 1) TOP VIEW SW BOOST I SENSE VOUT VIN HVOK VC ILIM DCB PACKAGE 8-LEAD (2mm s 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 TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE L T3653EDCB#PBF L T3653EDCB#TRPBF LDJN 8-Lead (2mm × 3mm) Plastic DFN –40°C to 125°C L T3653IDCB#PBF L T3653IDCB#TRPBF LDJN 8-Lead (2mm × 3mm) Plastic DFN –40°C to 125°C Consult L TC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container . Consult L TC Marketing for information on non-standard lead based fi nish parts. For more information on lead free part marking, go to: http://www.linear .com/leadfree/ For more information on tape and reel specifi cations, go to: http://www.linear .com/tapeandreel/ PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Operating Range l 7.5 30 V VIN Undervoltage Lockout Rising 6.5 7 7.5 V VIN Undervoltage Hysteresis 500 mV VIN Overvoltage Lockout Rising 30 33 36 V VIN Overvoltage Lockout Hysteresis 1V VIN Supply Current Not Switching 2.8 3.4 mA VOUT Reverse Leakage Current VIN = 0V, VOUT = 4.8V VIN = Open, VOUT = 4.8V μA μA V OUT Nominal Set Point VC Pin = Open 4.8 5 V VOUT Current Limit Range l 0.4 1.2 A VOUT Current Limit RILIM = 33.2k l 0.85 0.80 1.15 1.2 A A Operating Frequency l 1350 1500 1650 kHz VC Source Current VOUT = 0V, VC = 1.5V 12 μA VC Sink Current VOUT = 5V, VC = 1.5V 10 μA VC Switching Threshold IOUT = 0mA 1.1 V The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C; VIN = 12V, VBOOST = 17V, VSW = 0V, RILIM = 33.2k, unless otherwise noted.

ELECTRICAL CHARACTERISTICS

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 L T3653E is guaranteed to meet performance specifi cations from 0°C to 125°C. Specifi cations over the –40°C to 125°C operating temperature range are assured by design, characterization, and correlation with statistical process controls. The L T3653I specifi cations 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. The l denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C; VIN = 12V, VBOOST = 17V, VSW = 0V, RILIM = 33.2k, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS VC Clamp Voltage V OUT = 0V 1.75 V Switch Peak Current Limit (Note 4) 2 A Switch V CESAT ISW = 1A 275 mV Boost Diode Drop I DIODE = 60mA 0.9 1.2 V Boost Pin Current I SW = 1A 28 mA HVOK Output Voltage High I HVOK = 1mA l 4 4.4 5 V HVOK Output Voltage Low I HVOK = –2μA l 0.25 V 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 specifi ed maximum operating junction temperature may impair device reliability.

TYPICAL PERFORMANCE CHARACTERISTICS Switch Voltage Drop Switching Frequency Undervoltage Lockout Output Current Limit Output Current Limit VIN Overvoltage Lockout BOOST Pin Current Boost Diode V F TA = 25°C unless otherwise noted SWITCH CURRENT (A) SWITCH VOL TAGE DROP (mV) 400 350

3653 G01

125ºC –45ºC 25ºC TEMPERATURE (ºC) SWITCHING FREQUENCY (MHz) 1.7 1.6

3653 G02

1.0 1.1 1.2 1.3 1.4 1.5 –50 -25 0 25 50 75 100 125 TEMPERATURE (ºC) INPUT VOL TAGE (V) 8.0 7.5 7.0

3653 G03

4.0 4.5 5.0 5.5 6.0 6.5 –50 -25 0 25 50 75 100 125 150 RISING FALLING TEMPERATURE (ºC) CURRENT LIMIT (A) 1.2 1.15 1.1

3653 G04

0.8 0.85 0.9 0.95 1.05 –50 –25 0 25 50 75 100 125 RILIM = 33.2k OUTPUT CURRENT (A) OUTPUT VOL TAGE (V)

3653 G05

TEMPERATURE (ºC) INPUT VOL TAGE (V)

3653 G06

–50 –25 0 25 50 75 100 125 RISING FALLING SWITCH CURRENT (A) BOOST PIN CURRENT (mA)

3653 G07

DIODE CURRENT (mA) BOOST DIODE VF (V) 1.4 1.2 0.8

3653 G08

0.2 0.6 0.4 0 50 100 150 200 250 300

TYPICAL PERFORMANCE CHARACTERISTICS VC Current V C Operating Range PIN FUNCTIONS VIN (Pin 1): The VIN pin supplies current to the L T3653’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 indi- cates 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. V C (Pin 3): The VC pin is the output of the internal error amplifi er and is internally compensated. The voltage on this pin controls the peak switch current. Connect this pin to the battery charger V C 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 V OUT 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 I SENSE 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. VOUT (V) VC PIN CURRENT (μA)

3653 G09

–25 –20 –15 –10 4 4.4 4.8 5.2 5.6 6 TEMPERATURE (ºC) VC VOL TAGE (V) 2.0 1.8 0.0

3653 G10

0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 -50 -25 0 25 50 75 100 125 CURRENT LIMIT CLAMP SWITCHING THRESHOLD TA = 25°C unless otherwise noted

REGULATORS, REFERENCE, UVLO AND OVP OSCILLATOR AND SLOPE COMPENSATION L T3653 RSENSE1 FAUL T 2.5V REGULATOR VIN SWQ1 RSENSE2 FB EXPOSED PAD GND 3653 BD BOOST ISENSE VOUT VIN HVOK TO CHARGER TO CHARGER INTERNAL COMPENSATION R S Q DRIVER SINGLE-CELL Li-Ion BATTERY CHARGER SYSTEM LOAD 0.8V ILIM VC

Please refer to the Block Diagram. The L T3653 is specifi - cally tailored for use with a battery charger power path controller. The L T3653 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 effi ciency in the battery charger is achieved by keeping the voltage across it low. To accomplish this, the battery charger takes control of the L T3653 regulator control node, V C, 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 L T3653 is ready to start providing power to the system load. When the HVOK pin is low, the L T3653 is not switching and the system output is not supported by the L T3653 regulator. The L T3653 is a constant frequency, current mode step down regulator. A switch cycle is initiated when the 1.5MHz oscillator enables the RS fl ip fl op, turning on the internal power switch, Q1. The sense amplifi er (A1) monitors the switch current via the voltage dropped across the current sense resistor R SENSE1. The compara- tor compares the amplifi ed current signal with the output (VC) of the error amplifi er (G1). The switch is turned off when this current exceeds a value determined by the V C voltage. The error amplifi er monitors the V OUT volt- age through an internal resistor divider and, when not driven externally servos the V C voltage to regulate VOUT. If the V OUT voltage drops, the V C voltage will be driven higher increasing the output current and V OUT voltage. An active clamp (not shown) on the V C node provides current limit. The L T3653 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 effi cient operation. The switch driver operates from either V IN 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 V IN is less than 7V and greater than 33V, typical. When switching is disabled, the L T3653 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 amplifi er G2. The voltage across the sense resistor, R SENSE2, is compared to a voltage programmed by ex- ternal resistor R1 on the I LIM pin. A capacitor averages the inductor ripple current. If the averaged inductor cur- rent exceeds the programmed value then the V C 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.

is a larger physical size and poorer transient response. usually resulting in higher effi ciency. or cables, additional bulk capacitance may be necessary. input supply in pulses with very fast rise and fall times. switching current into a tight local loop, minimizing EMI. the catch diode (see the PCB Layout section). OUT has less than its nominal capacitance. Table 1. Output Current Limit vs RILIM Value

• • • 01 3 0 15 Typically, a 0.1μF capacitor is used.

range, output load range and temperature. tion for different confi gurations. concern unless the ambient temperature is above 85°C. (2mm × 3mm) DFN (DCB) package. compensation and stability testing. Figure 1. L T3653 PCB Layout

3653 F01

Dual Input High Effi ciency Battery Charger and T riple Buck PMIC Application TYPICAL APPLICATION VBUS CLPROG PROG VNTC NTC ILIM0 ILIM1 EN1 EN2 EN3 MODE USB WALL ADAPTER PMIC CONTROL VBUS HIGH VOL TAGE INPUT 7.5V TO 30V TRANSIENT TO 60V SYSTEM LOAD BAT (OPTIONAL) L1 = COILCRAFT , MSS6132-472MLC M1 = VISHAY, Si 2333DS D1 = DIODES INC., DFLS240 SINGLE-CELL Li-Ion 3.3V 25mA ALWAYS-ONC13 1μF 4.7μH

3653 TA02

27.4k 324k 2.1k MBR0520 4.7μF 50V C2 10μF 6.3V 10μF 6.3V 0.1μF 10V 2.2μF 3.3μH 2.2μF 1.02M R13 510k R14 100k R15 NTC 100k VIN BOOST SW ISENSE VOUT VOUT1 3.3V 600mAC8 10μF 10μF 10pF SW1 FB1 649k 4.7μH 806k VOUT3 1.8V 400mAC10 10μF 10pF SW3 FB3 R12 464k 4.7μH R11 232k VOUT2 1.2V 400mA RST2RST2 C12 10μF C11 10pF SW1 FB1 R10 100k Si2333DS

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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. PACKAGE DESCRIPTION 8-Lead Plastic DFN (2mm × 3mm) (Reference L TC DWG # 05-08-1718 Rev A) 3.00 p0.10 (2 SIDES) 2.00 p0.10 (2 SIDES) 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 0.40 p 0.10 BOTTOM VIEW—EXPOSED PAD 0.75 p0.05 R = 0.115 TYP R = 0.05 TYP

1.35 REF

(SEE NOTE 6)

0.200 REF

0.00 – 0.05 (DCB8) DFN 0106 REV A 0.23 p 0.05

0.45 BSC

R = 0.20 OR 0.25 s 45o CHAMFER 0.25 p 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED 2.10 p0.05 0.70 p0.05 3.50 p0.05 PACKAGE OUTLINE 1.35 p0.10 1.35 p0.05 1.65 p 0.10 1.65 p 0.05

Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear .com © LINEAR TECHNOLOGY CORPORATION 2008 LT 0708 • PRINTED IN USA PART NUMBER DESCRIPTION COMMENTS L T1939 Dual 25V, 2A (I OUT), 2.5MHz, High Effi ciency DC/DC Converter and LDO Controller VIN: 3.6V to 25V, VOUT(MIN) = 0.8V, IQ = 2.5mA, ISD < 10μA, 3mm × 3mm DFN-10 Package L T3480 36V with T ransient Protection to 60V, 2A (I OUT), 2.4MHz, High Effi ciency Step-Down DC/DC Converter with Burst Mode Operation V IN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-10 and TSSOP-16E Packages L T3500 36V, 40V MAX, 2A, 2.5MHz High Effi ciency DC/DC Converter and LDO Controller VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 3.7mA, ISD < 10μA, L T3505 36V with T ransient Protection to 40V, 1.4A (I OUT), 3MHz, High Effi ciency Step-Down DC/DC Converter VIN: 3.6V to 34V, VOUT(MIN) = 0.78V, IQ = 2mA, ISD < 2μA, 3mm × 3mm DFN-8 and MSOP-8E Packages L T3507 36V, T riple 2.5MHz, 2.4A + 1.5A + 1.5A I(I OUT) and LDO Controller VIN: 4V to 36V, VOUT(MIN) = 0.8V, IQ = 7mA, ISD < 1μA, 5mm × 7mm QFN-38 Package L T3508 36V with T ransient Protection to 40V, Dual 1.4A (I OUT), 3MHz, High Effi ciency Step-Down DC/DC Converter VIN: 3.7V to 37V, VOUT(MIN) = 0.8V, IQ = 4.6mA, ISD < 1μA, 4mm × 4mm QFN-24 and TSSOP-16E Packages L T3557/-1 USB Power Manager with Li-Ion/Polymer Charger, T riple Synchronous Buck Converter + LDO Complete Multi-Function PMIC: Linear Power Manager & Three Buck Regulators Bat-T rack Adaptive Output Control, “-1” version has 4.1V Vfl oat, 4mm x 4mm QFN-28 Package L T3680 36V, 3.5A (I OUT) 2.4MHz, High Effi ciency Step-Down DC/DC Converter VIN: 3.6V to 36V, VOUT(MIN) = 0.8V, IQ = 75mA, ISD < 1mA, 3mm × 3mm DFN-10, MSOP-10E L T3685 36V with T ransient Protection to 60V, 2A (I OUT), 2.4MHz, High Effi ciency Step-Down DC/DC Converter VIN: 3.6V to 38V, VOUT(MIN) = 0.78V, IQ = 70μA, ISD < 1μA, 3mm × 3mm DFN-24 and MSOP-10E Packages L T4089/-1/-5 High Voltage USB Power Manager with Ideal Diode Controller and High Effi ciency Li-Ion Battery Charger High Effi ciency 1.2A Charger from 6V to 36V (40V max) Input; “-1” for 4.1V fl oat voltage batteries; Bat-T rack™ Adaptive Output Control (L TC4089); Fixed 5V Output (L TC4089-5, -1); 3mm × 6mm DFN-22 Package L T4090/-5 High Voltage USB Power Manager with Ideal Diode Controller and High Effi ciency Li-Ion Battery Charger High Effi ciency 1.2A Charger from 6V to 38V (60V max) Input Bat-T rack Adaptive Output Control; “-5” has no Bat-T rack; 3mm × 6mm DFN-22 Package L TC4098 USB-Compatible Switchmode Power Manager with OVP High V IN: 38V operating, 60V transient; 66V OVP Maximizes Available Power from USB Port, Bat-T rack, “Instant-ON” Operation, 3mm x 4mm Burst Mode is a registered trademark of Linear Technology Corporation.ThinSOT is a trademark of Linear Technology Corporation. RELATED PARTS TYPICAL APPLICATION Dual Input High Effi ciency Battery Charger with Low Battery Start-Up and 1.2A Output Current Limit VBUS OVSENS D0 - D2 CHRG NTC USB WALL ADAPTER HIGH VOL TAGE INPUT 7.5V TO 30V TRANSIENT TO 60V SYSTEM LOAD (OPTIONAL)L1 = TDK, VLCF5020T-4R7NIR7-1 L2 = COILCRAFT , LPS4018-332MLC M1 = VISHAY, Si 2333DS D1 = DIODES INC., DFLS240 SEE THE L TC4098 DATASHEET FOR MORE INFORMATION ON CONFIGURING THE NTC BATTERY TEMPERATURE QUALIFICATION OR REDUCED IDEAL DIODE IMPEDANCE. SINGLE-CELL Li-Ion 0.1μF 3.3μH 4.7μH

3653 TA03

3.01k 6.04k 27.4k 10μF 6.3V TO UC TO UC 4.7μF 50V 22μF 6.3V 0.1μF 10V VIN VOUT ISENSE SW BOOST OVGATE BAT IDGATE