LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current
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Catalog excerpts

LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 1

Buck-Boost DC/DC Converter with 1 .3|JA Quiescent Current F€RTUR€S D€SCMPTIOn ■ Regulates VQUT Above, Below or Equal to ViN ■ Wide V|N Range: 2.42V to 15V, 1.92V to 15V After Start-Up (Bootstrapped) ■ Wide VQUT Range: 1.4V to 15.75V ■ 200mA Output Current in Buck Mode ■ Programmable Maximum Power Point Control ■ Current Mode Control ■ Pin Selectable Burst Mode® Operation ■ Power Good Indicator ■ Industrial Wireless Sensor Nodes ■ Post-Regulator for Harvested Energy ■ Solar Panel Post-Regulator/Charger ■ Intrinsically Safe Power Supplies ■ Avionics-Grade Wireless Headsets The LTC®3129 is a high efficiency 200mA buck-boost DC/DC converterwith a wide VIM and VQUT range. It includes an accurate RUN pin threshold to allow predictable regula- tor turn-on and a maximum power point control (MPPC) capability that ensures maximum power extraction from non-ideal power sources such as photovoltaic panels. The LTC3129 employs an ultralow noise, 1.2MHz PWM switching architecture that minimizes solution footprint by allowing the use of tiny, low profile inductors and ceramic capacitors. Built-in loop compensation and soft-start simplify the design. For high efficiency operation at light loads, automatic Burst Mode operation can be selected, reducing the quiescent current to just 1.3uA. Additional features include a power good output, less than 10nA of shutdown current and thermal shutdown. The LTC3129 is available in thermally enhanced 3mm x 3mm QFN and 16-lead MSOP packages. For fixed output voltageoptions, seethefunctionally equivalent LTC3129-1, which eliminates the need for an external feedback divider XT, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. TVPicni nppucnTion Efficiency and Power Loss vs Load ^^^J TECHNOLOGY

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 2

ABSOLUTE mnximum Rnnnos Operating Junction Temperature Range EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB ORD€R inFORffMTIOn 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:...

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 3

The • denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). Unless otherwise noted, Vm = 12V, V0UT = 5V.

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 4

€l€CTRICm CHRRRCTCRISTICS The • denotes the specifications which apply over the specified operating junction temperature range, otherwise specifications are at TA = 25°C (Note 2). Unless otherwise noted, Vm = 12V, V0UT = 5V. 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 Note 2: The LTC3129 is tested under pulsed load conditions such that Tj ~ TA. The LTC3129E is guaranteed to meet specifications from 0°C to 85°C junction temperature....

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 5

Tfl = 25°C, unless otherwise noted. Power Loss, VQUT = 3.3V Power Loss, VQUT = 5V Power Loss, VQUT = 12V Power Loss, VQUT = 15V Maximum Output Current No Load Input Current ^^^J TECHNOLOGY

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 6

TYPicm PCRFORmnncc cHnRnacRisTics TA = 25°C, unless otherwise noted. Burst Mode Threshold Switch RDS(ON) VS Temperature Vcc Dropout Voltage vs Temperature For more information www.linearcom/3129 ^^^J TCCHJOLOS?

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 7

= 25°C, unless otherwise noted. Fixed Frequency Ripple on VQUT Burst Mode Waveforms Burst Mode Ripple on V0UT CQUT = 22[JF (WITH THE RECOMMENDED FEEDFORWARD CAPACITOR) Start-Up Waveforms Step Load Transient Response in Fixed Frequency Step Load Transient Response in Burst Mode Operation FEEDFORWARD CAPACITOR) PGOOD Response to a Drop MPPC Response to a Step Load WAAWrJra For more information www.linearcom/3129 1

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 8

LTC3129 Pin Functions (QFN/MSOP) BST1 (Pin 1/Pin 15): Bootstrapped Floating Supply for High Side NMOS Gate Drive. Connect to SW1 through a 22nF capacitor, as close to the part as possible. The value is not critical. Any value from 4.7nF to 47nF may be used. VIN (Pin 2/Pin 16): Input Voltage for the Converter. Connect a minimum of 4.7µF ceramic decoupling capacitor from this pin to the ground plane, as close to the pin as possible. VCC (Pin 3/Pin 1): Output voltage of the internal voltage regulator. This is the supply pin for the internal circuitry. Bypass this output with a minimum of 2.2µF...

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 9

LTC3129 Block Diagram BST1 VIN SW1 LDO START VCC_GD DRIVER 4.1V DRIVER VOUT A B START VCC 1.175V VREF VREF 0.9V + – 1.22V + – NC ISENSE C START DRV_C DRV_A SD DRV_D + – ISENSE 500mA – + – + ISENSE 20mA 1.175V – + UV ILIM FB 1.1V LOGIC ENABLE UVLO RESET NC DRIVER DRV_B 1.175V MPPC DRIVER D VREF_GD RUN VOUT VCC ISENSE VIN BST2 VCC VREF VCC SW2 IZERO THERMAL SHUTDOWN ISENSE PWM VC – + + – + – VIN 1.175V SOFT-START OSC + – – + PWM 5M 100mV – + 600mV SLEEP GND PGOOD CLAMP –7.5% – + PGND 3129 BD 3129f For more information www.linear.com/3129 9

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LTC3129 - 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3?A Quiescent Current - 10

The LTC3129 isa 1.3|jA quiescent current, monolithic, cur- rent mode, buck-boost DC/DC converter that can operate overa wide input voltage range of 1.92Vto 15Vand provide up to 200mA to the load. Internal, low RDS(ON) N-channel powerswitches reduce solution complexity and maximize efficiency. A proprietary switch control algorithm allows the buck-boost converterto maintain outputvoltage regulation with input voltages that are above, below or equal to the output voltage. Transitions between the step-up or step- down operating modes are seamless and free of transients and sub-harmonic...

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