My Inquiry
My Account
Texas Instruments TPS55386PWPR
- Part No.:
- TPS55386PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS55386PWPR.pdf
- Description:
- IC REG BUCK ADJ 3A DL 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,290
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TPS55386PWPR from Texas Instruments is a dual non-synchronous buck converter IC with integrated 85-mΩ high-side MOSFETs, supporting 4.5-V to 28-V input and delivering up to 3 A per channel. It operates at 600 kHz fixed switching frequency, features current-mode control with external compensation, and enables ratiometric or sequential startup for power sequencing in multi-rail systems-used in digital TV and set-top box power supplies.
For engineers reviewing the TPS55386PWPR datasheet, TPS55386PWPR pinout, TPS55386PWPR application, or TPS55386PWPR equivalent, key selection considerations include its 600 kHz switching frequency, dual-channel independent enable (EN1/EN2), ILIM2-selectable overcurrent thresholds (1.5 A / 3.0 A / 4.5 A), 0.8-V ±1.75% reference, and thermal shutdown at +148°C.
Technical Context
The TPS55386PWPR implements current-mode PWM control with two independent error amplifiers (COMP1/COMP2) and externally compensated feedback loops via FB1/FB2. Its 180° out-of-phase dual outputs reduce input ripple and support multiphase operation up to 6 A when configured as a single output.
Startup behavior is programmable via the SEQ pin (BP/GND/floating) to enforce ratiometric or sequential voltage ramping. Overcurrent protection on Channel 1 is fixed at 4.5 A, while Channel 2 uses ILIM2 pin strapping (GND/BP/floating) to select 1.5 A, 3.0 A, or 4.5 A trip thresholds-enabling asymmetric load optimization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 600 kHz (TPS55386 variant); enables smaller magnetics and higher transient response vs. 300 kHz TPS55383. |
| Input Voltage Range | 4.5 V to 28 V; supports wide industrial and consumer DC bus inputs including 12 V and 24 V rails. |
| Output Current (per channel) | Up to 3 A continuous; limited by thermal design and PCB copper area due to 16-pin HTSSOP PowerPAD™ package. |
| Feedback Reference Voltage | 0.8 V ±1.75% (–40°C to +125°C); sets output voltage via resistor divider on FB1/FB2 with tight regulation tolerance. |
| High-Side MOSFET RDS(on) | 85 mΩ (typical at +25°C); defines conduction loss and thermal dissipation under full load. |
| Soft Start Time | 2.1 ms (typical); prevents inrush current during power-up; adjustable via BP capacitor value. |
| Thermal Shutdown Threshold | +148°C (with 20°C hysteresis); protects device during overload or poor heatsinking conditions. |
Pinout & Package
TPS55386PWPR is housed in a 16-pin PowerPAD™ HTSSOP (PWP) package with exposed thermal pad on bottom side, requiring direct connection to PCB ground plane for thermal and electrical performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PVDD1 | Power input for Output 1 high-side MOSFET | Must be bypassed with ≥10-µF low-ESR ceramic capacitor; independent of PVDD2 for dual-supply operation. |
| PVDD2 | Main supply for control circuitry, EN pull-up, Output 2 MOSFET | Monitored for UVLO (turn-on at 4.1 V); powers internal 5.25-V BP regulator and logic. |
| BOOT1 / BOOT2 | Bootstrap gate drive supply for respective high-side FETs | Connected via 22–82-nF capacitor to SW1/SW2; internal switch charges from BP during OFF time. |
| SW1 / SW2 | Switch node outputs | Drive external inductors; require snubbers to suppress ringing; connect to bootstrap capacitors. |
| FB1 / FB2 | Voltage feedback inputs | Connect to resistor dividers from respective outputs; regulate to 0.8 V reference with external compensation. |
| COMP1 / COMP2 | Error amplifier outputs | Interface with external RC network to GND for loop stability tuning across load/line variations. |
| EN1 / EN2 | Active-low enable inputs | Pulled up internally to PVDD2; <0.9 V enables soft start; floating = enabled via 6-µA current source. |
| ILIM2 | Channel 2 overcurrent threshold selector | GND = 1.5 A, BP = 3.0 A, floating = 4.5 A; sets fault current limit without external components. |
| SEQ | Startup sequencing mode control | BP = Output 2 then Output 1; GND = Output 1 then Output 2; floating = ratiometric simultaneous start. |
| BP | 5.25-V regulated bootstrap supply | Bypass with 4.7–10-µF X7R/X5R ceramic capacitor; powers BOOT1/BOOT2 and internal bias circuits. |
| GND | Signal and power ground | Must be connected to thermal pad; forms return path for all analog and power currents. |
Key Features
| Feature | Design Value |
|---|---|
| Dual 600 kHz PWM outputs, 180° out-of-phase | Reduces input capacitor RMS current by ~30% and eases EMI filtering vs. in-phase operation. |
| Configurable startup sequencing (ratiometric/sequential) | Single SEQ pin selects timing relationship between outputs-critical for FPGA, DSP, or ASIC core/I/O rail sequencing. |
| Three-level ILIM2 overcurrent programming | Enables precise current limiting for asymmetrical loads (e.g., 5-V/3.3-V rails with different current demands). |
| External compensation via COMP1/COMP2 | Allows full loop optimization for diverse output filter topologies (LC, LC+capacitor multiplier, etc.) and load ranges. |
| Integrated 85-mΩ high-side MOSFETs | Eliminates external switches and associated gate drivers-reducing BOM count and layout complexity. |
Applications
| Set-Top Box Power Supply | Digital Television Mainboard |
|---|---|
|
Use Scenario: Dual-rail generation for demodulator (3.3 V) and video processor (1.2 V) from 12-V DC input. IC Role / Device Role / Timing Role: Dual buck controller providing independently regulated, sequenced outputs with fast transient response. Use Value: SEQ pin enables ratiometric startup to meet processor power-on reset timing requirements; 600 kHz allows compact 2.2-µH inductors. |
Use Scenario: Powering SoC core (1.1 V), memory interface (1.8 V), and HDMI PHY (3.3 V) from 12-V or 24-V supply. IC Role / Device Role / Timing Role: Dual-output DC/DC converter configured as two independent regulators with separate EN control. Use Value: ILIM2 strapping allows 1.5-A limit on low-current 1.1-V rail and 3.0-A limit on 1.8-V rail-optimizing component stress and thermal margin. |
| Consumer Audio Amplifier | Industrial Embedded Controller |
|
Use Scenario: Generating ±15-V analog rails and 5-V digital logic supply from 24-V input in Class-D amplifier modules. IC Role / Device Role / Timing Role: Primary buck controller for positive 5-V rail; second channel used with external inverting charge pump for negative rail. Use Value: 28-V max input accommodates wide-range industrial 24-V systems; thermal shutdown protects against sustained short-circuit faults. |
Use Scenario: Powering ARM Cortex-M7 MCU (1.2 V), CAN transceiver (5 V), and isolated I/O (3.3 V) in PLC backplane modules. IC Role / Device Role / Timing Role: Dual buck regulator delivering stable, low-noise supplies with independent enable/disable for subsystem power gating. Use Value: 0.8-V reference tolerance ensures <±2% output accuracy across –40°C to +125°C ambient; HTSSOP PowerPAD™ aids convection cooling in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS55383PWPR | 300 kHz switching frequency; identical pinout, package, and feature set except oscillator frequency. | Better efficiency at light loads; larger inductors required; lower EMI fundamental frequency. | Select TPS55383PWPR when optimizing for peak efficiency >50% load or when EMI constraints favor sub-400 kHz fundamentals. |
| LM5119MT/NOPB | Two-channel synchronous buck controller (external MOSFETs); no integrated high-side FETs; wider 3–65 V input range. | Supports higher output currents (>5 A/channel); requires external gate drivers and discrete FETs; more complex layout. | Choose LM5119MT/NOPB for >3-A per channel, >28-V input, or synchronous rectification needs-accepting added BOM and layout effort. |
Compared with TPS55386PWPR, TPS55383PWPR trades higher-frequency operation for improved light-load efficiency and relaxed EMI filtering, while LM5119MT/NOPB sacrifices integration for scalability and input voltage headroom-making each suitable for distinct system-level trade-offs in size, efficiency, and cost.
Availability
TPS55386PWPR is available at Aetrix Electronics and suitable for digital television, set-top box, and industrial embedded controller designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for TPS55386PWPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-reliability DC/DC conversion solutions.
The TPS5538x family was designed specifically for cost-sensitive, space-constrained dual-rail consumer and industrial power supplies-emphasizing integration, flexible sequencing, and robust protection without external FETs or complex compensation networks.
FAQ
What is the maximum input voltage rating for the TPS55386PWPR?
The TPS55386PWPR has an absolute maximum input voltage rating of 30 V on PVDD1 and PVDD2 pins. However, the recommended operating input voltage range is 4.5 V to 28 V per the datasheet's Recommended Operating Conditions table. Exceeding 28 V may compromise long-term reliability or trigger UVLO hysteresis behavior outside specification.
How does the ILIM2 pin configure overcurrent protection on Channel 2 of the TPS55386PWPR?
The ILIM2 pin on the TPS55386PWPR selects one of three fixed overcurrent thresholds for Channel 2: connecting to GND sets 1.5 A, connecting to BP sets 3.0 A, and leaving it floating sets 4.5 A. This is implemented via internal 150-kΩ resistive dividers tied to BP and GND-no external components needed beyond the strap connection.
Can the TPS55386PWPR operate with separate input supplies for PVDD1 and PVDD2?
Yes, the TPS55386PWPR supports dual-supply operation: PVDD1 powers only the Output 1 high-side MOSFET, while PVDD2 powers the control circuitry, EN pull-ups, and Output 2 high-side MOSFET. The datasheet explicitly states PVDD1 may be higher or lower than PVDD2, enabling flexible power architecture design such as using local 12-V and 5-V rails.
What is the purpose of the SEQ pin on the TPS55386PWPR, and how does it affect startup behavior?
The SEQ pin on the TPS55386PWPR determines output voltage sequencing mode: tied to BP enables Output 2 → Output 1 sequential startup; tied to GND enables Output 1 → Output 2; left floating configures ratiometric (simultaneous) startup. This single-pin control eliminates external sequencing ICs in FPGA, DSP, or multi-core SoC applications requiring strict power-on timing.
Does the TPS55386PWPR include thermal protection, and what is its trip point?
Yes, the TPS55386PWPR includes thermal shutdown protection that activates at +148°C junction temperature, with 20°C hysteresis. Once tripped, the device halts switching on both channels until junction temperature falls below +128°C, preventing damage during sustained overload, poor PCB heatsinking, or ambient temperature excursions.
TPS55386PWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 2
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25.2V
- Current - Output:
- 3A
- Frequency - Switching:
- 630kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
TPS55386PWPR FAQ
1.How can I place an order for TPS55386PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS55386PWPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TPS55386PWPR reliable?
The price and inventory of TPS55386PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS55386PWPR is usually 5 days.
3.What payment methods are accepted for TPS55386PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS55386PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS55386PWPR?
TPS55386PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS55386PWPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TPS55386PWPR?
For technical support, including TPS55386PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS55386PWPR requirements.
6.How does Aetrix verify that TPS55386PWPR is sourced from the original manufacturer or authorized distributors?
All TPS55386PWPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TPS55386PWPR meets industry standards.
7.What is the process for return or replacement of TPS55386PWPR?
All TPS55386PWPR units undergo pre-shipment inspection (PSI). If there is an issue with TPS55386PWPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TPS55386PWPR part is unused and in its original packaging.
Return procedure for TPS55386PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TPS55386PWPR Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
