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Analog Devices LTC3129
15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3μA Quiescent Current
Overview
| Topology | Buck-Boost Converter |
| Input voltage | 2.42-15 V |
| Switching frequency | 1000-1400 kHz |
| Output 1 | 15.75 V / 0.2 A |
| IC revision | C |
Description
The LTC®3129 is a high efficiency, 200mA buck-boost DC/DC converter with a wide VIN and VOUT range. It includes an accurate RUN pin threshold to allow predictable regulator 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-startsimplify the design. For high efficiency operation at light loads, automatic Burst Mode operation can be selected, reducing the quiescent current to just 1.3μA.Additional features include a power good output, less than 10nA of shutdown current and thermal shutdown.The LTC3129 is available in thermally enhanced 3mm × 3mm QFN and 16-lead MSOP packages. For fixed output voltage options, see the functionally equivalent LTC3129-1, which eliminates the need for an external feedback divider
Features
- Regulates VOUT Above, Below or Equal to VIN
- Wide VIN Range: 2.42V to 15V, 1.92V to 15V After Start-Up (Bootstrapped)
- Wide VOUT Range: 1.4V to 15.75V
- 200mA Output Current in Buck Mode
- Single Inductor
- 1.3μA Quiescent Current
- Programmable Maximum Power Point Control
- 1.2MHz Ultralow Noise PWM
- Current Mode Control
- Pin Selectable Burst Mode® Operation
- Up to 95% Efficiency
- Accurate RUN Pin Threshold
- Power Good Indicator
- 10nA Shutdown Current
- Thermally Enhanced 3mm × 3mm QFN and 16-Lead MSOP Packages
Table 2. Recommended Inductor Values page 18.
VIN and VOUT Both < 4.5V3.3μH to 4.7μHVIN and VOUT Both < 8V4.7μH to 6.8μHVIN and VOUT Both < 11V6.8μH to 8.2μHVIN and VOUT Up to 15.75V8.2μH to 10μH
Typical applications
- Industrial Wireless Sensor Nodes
- Intrinsically Safe Power Supplies
- Post-Regulator for Harvested Energy
- Wireless Microphones
- Avionics-Grade Wireless Headsets
- Solar Panel Post-Regulator/Charger
More information
Products
Order Code | Datasheet | Simulation | Downloads | Status | Product series | L(µH) | IR(A) | ISAT(A) | fres(MHz) | Mount | Samples | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
 | WE-TPC SMT Tiny Power Inductor, 3.3 µH, 1.25 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.3 µH | Rated Current1.25 A | Saturation Current0.95 A | Self Resonant Frequency70 MHz | MountSMT | ||||
 | WE-TPC SMT Tiny Power Inductor, 3.3 µH, 1.5 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance3.3 µH | Rated Current1.5 A | Saturation Current1.8 A | Self Resonant Frequency100 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 4.7 µH, 1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance4.7 µH | Rated Current1 A | Saturation Current0.8 A | Self Resonant Frequency65 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 4.7 µH, 1.35 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance4.7 µH | Rated Current1.35 A | Saturation Current1.7 A | Self Resonant Frequency84 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 4.7 µH, 1.2 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance4.7 µH | Rated Current1.2 A | Saturation Current0.9 A | Self Resonant Frequency75 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 6.8 µH, 0.82 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance6.8 µH | Rated Current0.82 A | Saturation Current0.65 A | Self Resonant Frequency55 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 6.8 µH, 1.1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance6.8 µH | Rated Current1.1 A | Saturation Current1.3 A | Self Resonant Frequency59 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 6.8 µH, 0.85 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance6.8 µH | Rated Current0.85 A | Saturation Current0.75 A | Self Resonant Frequency45 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 10 µH, 0.65 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance10 µH | Rated Current0.65 A | Saturation Current0.5 A | Self Resonant Frequency40 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 10 µH, 1 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance10 µH | Rated Current1 A | Saturation Current1.1 A | Self Resonant Frequency41 MHz | MountSMT | ||||
| WE-TPC SMT Tiny Power Inductor, 10 µH, 0.74 A | Status Activei| Production is active. Expected lifetime: >10 years. | Product seriesWE-TPC SMT Tiny Power Inductor | Inductance10 µH | Rated Current0.74 A | Saturation Current0.56 A | Self Resonant Frequency45 MHz | MountSMT |