lt3506aidhd Linear Technology Corporation, lt3506aidhd Datasheet
lt3506aidhd
Available stocks
Related parts for lt3506aidhd
lt3506aidhd Summary of contents
Page 1
... Current mode PWM architecture provides fast transient response with simple compensation components and cycle-by-cycle current limiting. Frequency foldback and thermal shutdown provide additional protection. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. 1/2 BAT-54A V ...
Page 2
... LEAD BASED FINISH TAPE AND REEL LT3506EDHD LT3506EDHD#TR LT3506AEDHD LT3506AEDHD#TR LT3506IDHD LT3506IDHD#TR LT3506AIDHD LT3506AIDHD#TR LT3506EFE LT3506EFE#TR LT3506AEFE LT3506AEFE#TR LT3506IFE LT3506IFE#TR LT3506AIFE LT3506AIFE#TR Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. ...
Page 3
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifications are at T SYMBOL PARAMETER V Undervoltage Lockout IN(MIN) I Quiescent Current INQ I Shutdown Current INSD V Feedback Voltage Pin Bias Current FB V Reference Line Regulation FB(REG) gm Error ...
Page 4
LT3506/LT3506A TYPICAL PERFOR A CE CHARACTERISTICS W U Efficiency 1.8V (LT3506A) OUT 100 V = 1.8V OUT L = 4.7µH (COILCRAFT MSS6122-472MLB 25° 4. ...
Page 5
TYPICAL PERFOR A CE CHARACTERISTICS Temperature RUN/SS 3.0 2.5 2.0 1.5 1.0 0.5 0 – –25 TEMPERATURE (° CTIO BOOST1 (Pin 1), BOOST2 (Pin 8): The BOOST pins ...
Page 6
LT3506/LT3506A BLOCK DIAGRA W 2µA RUN/SS2 2µA RUN/SS1 0.75V ∑ SLOPE FOLDBACK LOGIC CLK RUN/ GND Figure 2. Block Diagram of the LT3506 with Associated External Components ( Regulators ...
Page 7
OPERATIO U (Refer to the Block Diagram) The LT3506 is a dual, constant frequency, current mode buck regulator with internal 2A power switches. The two regulators share common circuitry including voltage reference and oscillator. In addition, the analog blocks on ...
Page 8
LT3506/LT3506A APPLICATIO S I FOR ATIO Resistor Network The output voltage is programmed with a resistor divider between the output and the FB pin. Choose the 1% resis- tors according to R2(V /0.8 – 1) ...
Page 9
APPLICATIO S I FOR ATIO U U The current in the inductor is a triangle wave with an average value equal to the load current. The peak switch current is equal to the output current plus half the peak-to- peak ...
Page 10
LT3506/LT3506A APPLICATIO S I FOR ATIO U U tor must have low impedance at the switching frequency to do this effectively, and it must have an adequate ripple current rating. With two switchers operating at the same frequency but with ...
Page 11
APPLICATIO S I FOR ATIO U U Finally, there must be enough capacitance for good transient performance. The last equation gives a good starting point. Alternatively, you can start with one of the designs in this data sheet and experiment ...
Page 12
LT3506/LT3506A APPLICATIO S I FOR ATIO U U shows three ways to arrange the boost circuit. The BOOST pin must be more than 2.5V above the SW pin for full efficiency. For outputs of 3.3V and higher the standard circuit ...
Page 13
APPLICATIO S I FOR ATIO U U The minimum input voltage of an LT3506 application is limited by the minimum operating voltage (<3.6V) and by the maximum duty cycle as outlined above. For proper start-up, the minimum input voltage is ...
Page 14
LT3506/LT3506A APPLICATIO S I FOR ATIO U U Frequency Compensation The LT3506 uses current mode control to regulate the output. This simplifies loop compensation. In particular, the LT3506 does not require the ESR of the output capacitor for stability so ...
Page 15
APPLICATIO S I FOR ATIO U U supply or glitching the input supply when the LT3506 is enabled. The RUN/SS pins do not provide an accurate delay to start or an accurately controlled ramp at the output voltage, both of ...
Page 16
LT3506/LT3506A APPLICATIO S I FOR ATIO U U tor on RUN/SS2. This allows the LT3506 to start up and enable its power good comparator before RUN/SS2 gets high enough to allow channel 2 to start switching. Channel 2 only operates ...
Page 17
APPLICATIO S I FOR ATIO U U Shorted Input Protection If the inductor is chosen so that it won’t saturate exces- sively, the LT3506 will tolerate a shorted output. There is another situation to consider in systems where the output ...
Page 18
LT3506/LT3506A APPLICATIO S I FOR ATIO U U Single, Low-Ripple 3.2A Output The LT3506 can generate a single, low-ripple 3.2A output if the outputs of the two switching regulators are tied together and share a single output capacitor. By tying ...
Page 19
TYPICAL APPLICATIO 4.5V TO 21V L1 4.7µH V OUT1 1.8V 1.5A 18.7k 47µF 15k 100k PGOOD D1, D2: ON SEMICONDUCTOR MBRS230LT3 D3: BAT-54A L1: COILCRAFT MSS6122-472 L2: TDK SLF7028-3R3M 25V L1 4.7µH ...
Page 20
LT3506/LT3506A TYPICAL APPLICATIO S U Low Ripple, Low Profile 1.2V, 3A Converter, Maximum Height = 2mm V IN 4.5V TO 21V V OUT 100k PGOOD D1, D2: DIODES, INC. B230A D3: BAT-54A L1, L2: SUMIDA CDRH5D18-4R1 ...
Page 21
TYPICAL APPLICATIO S U Low Ripple, Low Profile 0.8V, 3A Converter, Maximum Height = 1mm OUT 100k PGOOD D1, D2: DIODES, INC. DFLS230L D3: BAT-54AT L1, L2: COILCRAFT LPO6610-152ML Low Profile 1.8V and 1.3V ...
Page 22
LT3506/LT3506A PAckAge DescRiPtion 4.50 ±0.05 3.10 ±0.05 2.44 ±0.05 (2 SIDES) RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJGD-2) IN JEDEC PACKAGE ...
Page 23
... DIMENSIONS ARE IN 3. DRAWING NOT TO SCALE 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. FE Package 16-Lead Plastic TSSOP (4 ...
Page 24
... LTC3736 Dual Two Phase Synchronous Controller with Output Tracking LTC3737 Dual Two Phase Controller with Output Tracking trademark of Linear Technology Corporation. SENSE Linear Technology Corporation 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 ● COMMENTS ...