|Title||LTC3115-1 - 40V, 2A Synchronous Buck-Boost DC/DC Converter|
|Description||The LTC®3115-1 is a high voltage monolithic synchronous buck-boost DC/DC converter. Its wide 2.7V to 40V input and output voltage ranges make it well suited to a wide variety of automotive and industrial applications. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes.
Programmable frequency PWM mode operation provides low noise, high efficiency operation and the ability to synchronize switching to an external clock. Switching frequencies up to 2MHz are supported to allow use of small valued inductors for miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light load efficiency which combined with a 3μA shutdown current make the LTC3115-1 ideally suited for battery-powered applications. Additional features include output disconnect in shutdown, short-circuit protection and internal soft-start. The LTC3115-1 is available in thermally enhanced 16-lead 4mm × 5mm × 0.75mm DFN and 20‑lead TSSOP packages.
|Company||Linear Technology Corporation|
|Datasheet||Download LTC3115-1 datasheet
The is a high voltage monolithic synchronous buck-boost DC/DC converter. Its wide to 40V input and output voltage ranges make it well suited to a wide variety of automotive and industrial applications. A proprietary low noise switching algorithm optimizes efficiency with input voltages that are above, below or even equal to the output voltage and ensures seamless transitions between operational modes. Programmable frequency PWM mode operation provides low noise, high efficiency operation and the ability to synchronize switching to an external clock. Switching frequencies to 2MHz are supported to allow use of small valued inductors for miniaturization of the application circuit. Pin selectable Burst Mode operation reduces standby current and improves light load efficiency which combined with a 3µA shutdown current make the LTC3115-1 ideally suited for battery-powered applications. Additional features include output disconnect in shutdown, short-circuit protection and internal soft-start. The LTC3115-1 is available in thermally enhanced × 0.75mm DFN and 20lead TSSOP packages.
L, LT, LTC, LTM, Burst Mode, LTspice, Linear Technology and the Linear logo are registered trademarks and No RSENSE is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including 6404251, 6166527 and others pending.
Wide VIN Range: to 40V Wide VOUT Range: 40V 1A Output Current for VIN 3.6V, VOUT 5V 2A Output Current in Step-Down Operation for VIN 6V Programmable Frequency: to 2MHz Supports Synchronization with an External Clock to 95% Efficiency 50µA Burst Mode® Quiescent Current Ultralow Noise Buck-Boost PWM Internal Soft-Start 3µA Supply Current in Shutdown Programmable Input Undervoltage Lockout Small × 0.75mm DFN Package Thermally Enhanced 20-Lead TSSOP PackageAPPLICATIONS
24V/28V Industrial Applications Automotive Power Systems Telecom, Servers and Networking Equipment FireWire Regulator Multiple Power Source Supplies
VIN, PVIN, VOUT, PVOUT............................... VSW1, VSW2 DC............................................ 0.3V to (PVIN + 0.3V) Pulsed (<100ns).......................1.5V to (PVIN + 1.5V) VRUN........................................................... + 6V
Voltage, All Other Pins.................................. to 6V Operating Junction Temperature Range (Notes to 125°C Storage Temperature Range................... to 150°C Lead Temperature (Soldering, 10 sec) FE...................................................................... 300°CTOP VIEW RUN SW2 PVOUT GND FB RT PGND 17 16 PWM/SYNC SW1 14 PVIN BST2 11 PVCC 10 VIN 9 VCC
DHD PACKAGE × 4mm) PLASTIC DFN TJMAX = 4.3°C/W EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
FE PACKAGE 20-LEAD PLASTIC TSSOP TJMAX = 10°C/W EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED TO PCB FOR RATED THERMAL PERFORMANCE
LEAD FREE FINISH LTC3115EFE-1#PBF LTC3115IFE-1#PBF TAPE AND REEL LTC3115EFE-1#TRPBF LTC3115IFE-1#TRPBF PART MARKING* 31151 LTC3115FE-1 PACKAGE DESCRIPTION × 4mm) Plastic DFN × 4mm) Plastic DFN 20-Lead Plastic TSSOP 20-Lead Plastic TSSOP TEMPERATURE RANGE 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/
LTC3115-1 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are for = 25°C (Note 2). VIN = 24V, VOUT = 5V, unless otherwise noted.
PARAMETER Input Operating Voltage Output Operating Voltage Input Undervoltage Lockout Threshold Input Undervoltage Lockout Hysteresis VCC Undervoltage Lockout Threshold VCC Undervoltage Lockout Hysteresis Input Current in Shutdown Input Quiescent Current in Burst Mode Operation Oscillator Frequency Oscillator Operating Frequency PWM/SYNC Clock Input Frequency PWM/SYNC Input Logic Threshold Soft-Start Duration Feedback Voltage Feedback Voltage Line Regulation Feedback Pin Input Current RUN Pin Input Logic Threshold RUN Pin Comparator Threshold RUN Pin Hysteresis Current RUN Pin Hysteresis Voltage Inductor Current Limit Reverse Inductor Current Limit Burst Mode Inductor Current Limit Maximum Duty Cycle Minimum Duty Cycle SW1, SW2 Minimum Low Time N-Channel Switch Resistance
N-Channel Switch Leakage PVCC/VCC External Forcing Voltage VCC Regulation Voltage VCC Load Regulation VCC Line Regulation VCC Current Limit VCC Dropout Voltage VCC Reverse Current
(Note 3) (Note 3) (Note 3) Percentage of Period SW2 is Low in Boost Mode (Note 5) Percentage of Period SW1 is High in Buck Mode (Note = 35.7k (Note 5) Switch A (From PVIN to SW1) Switch B (From SW1 to PGND) Switch C (From SW2 to PGND) Switch D (From PVOUT to SW2) PVIN = PVOUT = 0V IVCC = 1mA IVCC to 20mA IVCC = 1mA, VIN to 40V VCC = 2.5V IVCC = 5mA, VIN = 2.7V VCC = 5V, VIN = 3.6V
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 LTC3115-1 is tested under pulsed load conditions such that TJTA. The LTC3115E-1 is guaranteed to meet specifications from to 85°C junction temperature. Specifications over the to 125°C operating junction temperature range are ensured by design, characterization and correlation with statistical process controls. The LTC3115I-1 specifications
are guaranteed over the to 125°C operating junction temperature range. The maximum ambient temperature is determined by specific operating conditions in conjunction with board layout, the rated package thermal resistance and other environmental factors. The junction temperature (TJ in °C) is calculated from the ambient temperature (TA in °C) and power dissipation (PD in Watts) according to the following formula: TA + (PD JA) where JA is the thermal impedance of the package.
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