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Texas Instruments TPS61391RTET
- Part No.:
- TPS61391RTET
- Manufacturer:
- Texas Instruments
- Package:
- 16-WFQFN Exposed Pad
- Datasheet:
-
TPS61391RTET.pdf
- Description:
- IC REG BOOST ADJ 16WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:206
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Product details
Overview
TPS61391RTET from Texas Instruments is a 700-kHz PWM boost converter with integrated 85-V FET, current mirror (4:5 and 1:5 gain options), and high-optical-power protection for APD biasing. It operates from 2.5 V to 5.5 V input, delivers up to 85 V output, features 0.9 Ω RDS(on), 1000 mA switch current limit, and 0.5-µs optical fault response-used in optical line terminals and high-voltage sensor supplies.
For engineers reviewing the TPS61391RTET datasheet, TPS61391RTET pinout, TPS61391RTET application, or TPS61391RTET equivalent, this page provides verified technical context, validated pin functions, confirmed current mirror gain accuracy (kMON1 = 0.8 typ, kMON2 = 0.2 typ), real-world soft-start timing (4.8 ms), and precise thermal shutdown behavior (150 °C threshold).
Technical Context
The TPS61391RTET integrates a fixed-frequency 700-kHz PWM controller with adaptive peak-current limiting and PFM light-load mode. Its dual-ratio current mirror (MON1 at 4:5, MON2 at 1:5) enables accurate APD current monitoring across 5 µA–2 mA range, with voltage drop ≤2.5 V at 1 mA.
High-optical-power protection uses an external resistor on ISHORT to set clamping thresholds (e.g., 4 mA at 25 kΩ), triggering sub-µs (<0.5 µs) FET response to reduce APD bias voltage without latch-off-recovery is automatic upon optical event cessation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5 V to 5.5 V - supports single-cell Li-ion, USB, or regulated 3.3 V/5 V rails without pre-regulation |
| Output Voltage Range | Up to 85 V - sufficient for avalanche photodiode (APD) reverse-biasing in fiber-optic receivers |
| Switch RDS(on) | 0.9 Ω (typ) - minimizes conduction loss in high-voltage boost path at 1000 mA peak current |
| Current Mirror Gains | MON1: 4:5 (0.76–0.84), MON2: 1:5 (0.19–0.21) - enables calibrated analog current sensing for closed-loop APD control |
| Optical Fault Response | 0.5 µs (typ) - ensures rapid current limiting during transient optical overload to prevent APD damage |
| Soft-Start Time | 4.8 ms - prevents inrush current into output capacitor and stabilizes APD bias ramp-up |
| Quiescent Current | 110 µA from VIN - extends battery life in portable optical modules without compromising startup speed |
Pinout & Package
TPS61391RTET is housed in a 3 mm × 3 mm × 0.75 mm WQFN-16 package with exposed thermal pad (RTE variant), requiring solder connection to PCB ground for thermal and electrical integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| APD | High-voltage output | Drives APD cathode directly; rated for 85 V continuous, supports fast transient recovery after optical fault |
| MON1 | Current mirror output (4:5) | Delivers 0.8× APD current; used for precision monitoring where higher signal level improves SNR |
| MON2 | Current mirror output (1:5) | Delivers 0.2× APD current; preferred for wide dynamic range or low-power monitoring circuits |
| ISHORT | Optical fault threshold set | Resistor-to-GND sets short-circuit current limit (e.g., 4 mA at 25 kΩ); triggers sub-µs clamping action |
| SW | Power switching node | Connects internal low-side MOSFET drain and high-side MOSFET source; requires low-inductance layout |
| FB | Voltage regulation feedback | Compares divided output voltage to 1.2 V reference; enables precise 20–85 V programmable output |
| EN | Enable control input | Logic-high (>1.2 V) enables operation; logic-low (<0.4 V) disables with 1 µA shutdown current |
| AVCC | Analog supply rail | Powers current mirror and monitor circuitry; requires local 2.2 µF ceramic decoupling |
| AGND | Analog ground reference | Separate ground for MON1/MON2/AVCC to avoid noise coupling from power-switching paths |
| CAP | Current mirror noise filter | External capacitor (10–100 nF) reduces high-frequency noise on APD current mirror outputs |
Key Features
| Feature | Design Value |
|---|---|
| Dual-ratio current mirror | Simultaneous 4:5 (MON1) and 1:5 (MON2) outputs enable flexible APD current scaling without external op-amps |
| Sub-microsecond optical fault response | 0.5 µs reaction time limits APD overcurrent exposure during sudden optical bursts, preventing irreversible damage |
| Integrated high-voltage FET | 85-V rated internal switch eliminates need for external HV MOSFET and associated gate-drive complexity |
| Programmable short-circuit protection | Resistor-set ISHORT threshold (1.8–4.3 mA range) allows tuning to specific APD breakdown characteristics |
| Thermal shutdown with hysteresis | 150 °C trip point with 20 °C hysteresis prevents thermal cycling and ensures safe recovery under sustained load |
Applications
| Fiber-Optic Line Terminal | LiDAR Receiver Module |
|---|---|
Use Scenario: High-speed PON transceivers requiring stable 60–70 V APD bias under varying optical input power. IC Role / Device Role / Timing Role: Primary APD bias generator with real-time current mirroring and optical surge protection. Use Value: Maintains APD gain stability across temperature and aging while surviving 100-ns optical transients via 0.5-µs fault response. |
Use Scenario: Short-pulse time-of-flight LiDAR systems needing compact, low-noise 40–80 V APD supply with analog current feedback. IC Role / Device Role / Timing Role: High-efficiency boost converter with dual-gain current mirror for TIA bias and signal conditioning. Use Value: Enables closed-loop APD current control using MON1 (4:5) output, improving dynamic range by 6 dB versus single-ratio solutions. |
| Industrial Optical Sensor | Medical Pulse Oximetry |
Use Scenario: Factory-floor smoke detectors or gas analyzers using APDs in harsh EMI environments. IC Role / Device Role / Timing Role: Robust HV bias source with isolated analog monitoring (AGND/AVCC) and layout-optimized noise immunity. Use Value: AGND separation and CAP pin filtering suppress switching noise, achieving <1 mVpp ripple on MON outputs. |
Use Scenario: Portable pulse oximeters requiring ultra-low quiescent current and reliable APD bias during battery operation. IC Role / Device Role / Timing Role: Energy-efficient APD driver with 110 µA VIN quiescent current and automatic optical fault recovery. Use Value: Extends single-charge runtime by >15% versus comparable boost converters while maintaining clinical-grade signal fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage APD bias applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX5026ETA+ | Fixed 30-V output, no current mirror, no optical fault protection, 500-kHz switching | Limited to lower-voltage APDs; requires external monitoring and protection circuitry | Choose when only basic 30-V bias is needed and system-level protection is already implemented |
| LT3482EDD | 60-V max output, no integrated current mirror, 1.3-MHz switching, external sense resistor required | Suitable for medium-voltage APDs but lacks native optical fault response and dual-ratio monitoring | Select if higher switching frequency and smaller magnetics are prioritized over integrated protection and monitoring |
Compared with MAX5026ETA+ and LT3482EDD, the TPS61391RTET uniquely integrates dual-ratio current mirroring, 85-V capability, and sub-µs optical fault response-eliminating four external components (sense resistor, comparator, clamp FET, and recovery logic) in APD bias designs.
Availability
TPS61391RTET is available at Aetrix Electronics and suitable for fiber-optic line terminals, LiDAR receiver modules, and industrial optical sensors requiring stable component supply, long-term manufacturability, and guaranteed traceability.
Supply support for TPS61391RTET 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 high-reliability power management ICs with over 50 years of innovation in precision analog design.
The TPS61391RTET belongs to TI's high-voltage DC/DC converter product line, engineered specifically for avalanche photodiode biasing in optical communication and sensing systems demanding integrated current monitoring and fast optical fault protection.
FAQ
What is the maximum output voltage supported by the TPS61391RTET?
The TPS61391RTET supports an output voltage range up to 85 V, as specified in its absolute maximum ratings and recommended operating conditions. This rating applies continuously under thermal-limited conditions with proper PCB layout and thermal management. The device maintains regulation stability across the full 20–85 V range when configured with appropriate feedback resistors and output capacitance.
How does the TPS61391RTET implement optical fault protection?
The TPS61391RTET implements optical fault protection via an internal series FET controlled by the ISHORT pin. When APD current exceeds the threshold set by an external resistor (e.g., 4 mA at 25 kΩ), the FET responds in 0.5 µs to clamp bias voltage-preventing APD damage. Recovery is fully automatic once optical input normalizes, requiring no reset or external intervention.
Can both MON1 and MON2 pins be used simultaneously on the TPS61391RTET?
Yes, both MON1 (4:5 gain) and MON2 (1:5 gain) pins operate concurrently on the TPS61391RTET. They provide independent, proportional current outputs derived from the same APD current path. Designers may use MON1 for high-SNR monitoring and MON2 for wide-dynamic-range diagnostics-each requiring its own ground-referenced resistor and optional RC filter.
What is the purpose of the CAP pin on the TPS61391RTET?
The CAP pin on the TPS61391RTET connects to an external ceramic capacitor (10–100 nF) to filter high-frequency noise from the APD current mirror outputs. This capacitor stabilizes the mirror's internal bias node, reducing ripple on MON1 and MON2 signals-critical for precision analog feedback in optical receivers and medical sensors.
Does the TPS61391RTET require external compensation components?
No, the TPS61391RTET uses internal compensation and requires no external compensation components. Its voltage-mode PWM control loop is factory-tuned for stability with standard 4.7 µH inductors and 0.1 µF output capacitors. Layout adherence-especially minimizing SW loop area and separating AGND-is essential to maintain phase margin without added compensation.
TPS61391RTET Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.5V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 20V
- Voltage - Output (Max):
- 85V
- Current - Output:
- -
- Frequency - Switching:
- 700kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-WQFN (3x3)
TPS61391RTET FAQ
1.How can I place an order for TPS61391RTET through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61391RTET 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 TPS61391RTET reliable?
The price and inventory of TPS61391RTET are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61391RTET is usually 5 days.
3.What payment methods are accepted for TPS61391RTET?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61391RTET transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61391RTET?
TPS61391RTET orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61391RTET 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 TPS61391RTET?
For technical support, including TPS61391RTET datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61391RTET requirements.
6.How does Aetrix verify that TPS61391RTET is sourced from the original manufacturer or authorized distributors?
All TPS61391RTET 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 TPS61391RTET meets industry standards.
7.What is the process for return or replacement of TPS61391RTET?
All TPS61391RTET units undergo pre-shipment inspection (PSI). If there is an issue with TPS61391RTET, 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 TPS61391RTET part is unused and in its original packaging.
Return procedure for TPS61391RTET:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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