TPS55165-Q1 - 36V 1A Buck-Boost Regulator | Texas Instruments
MPN: TPS55165QPWPRQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $5.1 | $5.10 |
| 10 | $4.59 | $45.90 |
| 100 | $3.98 | $398.00 |
| 500 | $3.42 | $1,710.00 |
| 1,000 | $3.05 | $3,050.00 |
TPS55165QPWPRQ1 Overview
A buck-boost converter is a non-isolated DC-DC switching regulator within the broader voltage regulator and power management IC hierarchy that maintains a regulated output even when the input voltage crosses the output level. The TPS55165-Q1 uses four integrated switches and a single inductor, with TI's buck-boost overlap control ensuring automatic, seamless transition between step-down and step-up modes with optimal efficiency and minimal output ripple.
Key features include a wide input voltage range up to 36 V, fixed 5 V or 12 V output selection, 2 MHz switching frequency that allows small inductors and fast transient response, synchronous rectification for high efficiency, and a power-good (PG) pin for rail monitoring. The Q1 designation confirms AEC-Q100 qualification for automotive applications. The same TPS5516x-Q1 family includes the TPS55160-Q1 and TPS55162-Q1, which offer configurable outputs of 5.7 V to 9 V via an external resistive divider, sharing the same package and pinout.
Typical applications include automotive start-stop and cold-crank power conditioning, 12 V battery-rail stabilization, automotive infotainment and cluster displays, and renewable-energy harvesting modules such as the RAK WisBlock RAK19004 green power module, which uses the TPS55165-Q1 to convert solar or hydro power to a fixed 5 V rail.
Design consideration: because it is a boost-type topology, ensure the input pin cannot be shorted to output before the converter starts; TI datasheet SLVSDY1 provides layout and external component guidance.
Drop-in alternatives for TPS55165QPWPRQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS55160QPWPRQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS55162QPWPTQ1
✅ Drop-In📋 Reference alternative (not in catalog)
TPS55165QPWPRQ1 Maximum Ratings & Electrical Characteristics
| Topology | Single-inductor synchronous buck-boost |
| Input Voltage Range | Up to 36 V |
| Output Voltage | Fixed 5 V or 12 V |
| Output Current | 1 A |
| Switching Frequency | 2 MHz |
| Number of Outputs | 1 |
| Control Scheme | Buck-boost overlap control |
| Power Good Pin | Yes (PG) |
| Automotive Qualification | AEC-Q100 (Q1) |
| Package | 20-PowerTSSOP (PWP, 4.40 mm width) |
| Mounting Type | Surface Mount |
| Family Variants | TPS55160-Q1 / TPS55162-Q1 adjustable 5.7 V to 9 V |
| Rectification | Synchronous |
| Polarity | Positive |
| Application Grade | Automotive |
TPS55165QPWPRQ1 Pin Configuration
| Pin 1 | BOOT — Bootstrap for high-side gate driver (via capacitor to SW) |
| Pin 2 | VIN — Input supply, up to 36 V |
| Pin 4 | EN — Enable input |
| Pin 5 | SS/TR — Soft-start / tracking |
| Pin 8 | SW1 — Switch node 1 |
| Pin 12 | SW2 — Switch node 2 |
| Pin 15 | VOUT — Regulated output (5 V or 12 V) |
| Pin 16 | VSET — Output voltage selection (5 V / 12 V) |
| Pin 18 | PG — Power-good open-drain output (requires pull-up) |
| Pin 20 | AGND — Analog ground |
Typical Applications
TPS55165QPWPRQ1 is suitable for 6 applications: Automotive Start-Stop Power Conditioning, Automotive Infotainment and Display Rails, Solar and Green Energy Harvesting, Industrial 24 V Bus Regulation, USB and Test Equipment 5 V Supplies, Battery-Powered Portable Instruments.
Automotive Start-Stop Power Conditioning
The TPS55165-Q1 regulates a stable 5 V or 12 V rail from a 12 V automotive battery whose voltage swings from cold-crank lows to load-dump transients within its 36 V rating. Its AEC-Q100 qualification meets automotive temperature and reliability requirements, while 2 MHz switching keeps the single inductor small for space-constrained ECUs. The buck-boost overlap control maintains regulation seamlessly as the battery crosses the output threshold, making it ideal for start-stop clusters and body modules.
Recommended
Automotive Infotainment and Display Rails
Infotainment head units and digital clusters run from vehicle battery inputs that vary above and below the 5 V logic or 12 V backlight rail. The TPS55165-Q1's fixed 12 V output directly powers display bias rails, and its 1 A output plus power-good pin provides monitored, protected power for display controllers. The 36 V input margin absorbs alternator load-dump events without external surge protection, reducing system cost versus discrete protection circuits.
Recommended
Solar and Green Energy Harvesting
The RAK WisBlock RAK19004 Green Power Module uses the TPS55165-Q1 to convert harvested solar, hydro, or wind energy into a fixed 5 V output for ESP32-class and other microcontroller boards. Photovoltaic panel voltage varies with irradiance above and below 5 V, which is exactly where buck-boost overlap control keeps the output regulated. The 2 MHz switching frequency allows a compact inductor suited to small IoT module footprints.
Recommended
Industrial 24 V Bus Regulation
Industrial control systems powered from 24 V or unstable rectified DC buses need regulated 5 V and 12 V auxiliary rails. The TPS55165-Q1 accepts inputs up to 36 V and delivers a clean fixed output at 1 A, tolerating bus droop below the output voltage without losing regulation thanks to its buck-boost topology. The PG pin enables supply monitoring in PLC I/O modules, sensors, and field transmitters where rail supervisory reporting is required.
Recommended
USB and Test Equipment 5 V Supplies
Test instruments, USB-powered adapters, and bench accessories often draw from sources between 4 V and 36 V, including 12 V wall adapters and vehicle outlets. The TPS55165-Q1 fixed 5 V output at 1 A with synchronous rectification delivers high efficiency and low ripple, while the 2 MHz switching frequency places noise above sensitive analog bands for easy filtering. Its PWP exposed-pad package simplifies thermal design in enclosed adapters.
Recommended
Battery-Powered Portable Instruments
Portable instruments powered by 2S-3S Li-ion packs or 12 V SLA batteries benefit from the TPS55165-Q1's ability to regulate 5 V or 12 V as the pack discharges through the output voltage. The fixed-output option removes the feedback divider, and the power-good flag supports low-battery detection in the host MCU. Efficiency from synchronous operation extends runtime, critical for handheld meters and dataloggers used in field service.
Recommended
Recommended Products Summary
Engineering reference data for TPS55165QPWPRQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS55160QPWPRQ1 | TPS55162QPWPTQ1 | TPS63070QRNMTQ1 |
|---|---|---|---|---|
| Package | 20-PowerTSSOP (PWP) | 20-PowerTSSOP (PWP) - same | 20-PowerTSSOP (PWP) - same | VQFN-HR-9 - different |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Voltage | Fixed 5 V or 12 V | 5.7 V to 9 V adjustable | 5.7 V to 9 V adjustable | 2 V to 22 V adjustable |
| Input Voltage Max | 36 V | 36 V | 36 V | 16 V |
| Output Current | 1 A | 1 A | 1 A | 2 A |
| Automotive Grade (AEC-Q100) | Yes (Q1) | Yes (Q1) | Yes (Q1) | Yes (Q1) |
| Output Configuration | Fixed (no divider needed) | External resistor divider | External resistor divider | External resistor divider |
Key Differentiators
- Fixed output, no feedback divider required (vs TPS55160QPWPRQ1)
- 36 V input covers automotive load-dump (vs TPS63070QRNMTQ1)
- Single-inductor buck-boost with overlap control (vs TPS55162QPWPTQ1)
Design Notes
Place the BOOT capacitor close between BOOT and SW1, and keep the four-switch power loop (VIN caps, inductor, VOUT caps) as tight as possible on the PWP package's exposed PowerPAD. TI datasheet SLVSDY1 layout section recommends low-ESR 10 uF-plus ceramic input and output capacitors rated for the 36 V input and solid ground pour under the PowerPAD for thermal relief.
The PG pin is open-drain and needs a pull-up to a valid bias supply; TI E2E forum thread 840709 documents issues when users omit this pull-up for 12 V designs. Also confirm the VSET pin resistor selection for 5 V vs 12 V output - incorrect VSET configuration is the most common bring-up failure. Do not exceed 36 V input including transients.
At high step-down ratios (e.g., 24 V to 5 V at 1 A), synchronous buck-boost conduction through four switches increases losses versus a single buck. Verify junction temperature using theta-JA for the 20-pin PWP with the exposed pad soldered to a copper area per datasheet thermal information; use at least 2x2 via array to ground plane under the PowerPAD.
The 2 MHz switching frequency is above AM band and simplifies input filtering for automotive CISPR-class designs, but still use a small RC snubber on SW nodes if ringing exceeds device ratings. Route the sensitive SS/TR and FB/VSET nodes away from SW traces per the TPS55165Q1-EVM reference layout.
Compliance Information
Q1 suffix confirms AEC-Q100 automotive qualification per TI. Detailed RoHS/REACH substance declarations should be obtained from TI product page material certificates.
