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Texas Instruments TPS61131PWR
- Part No.:
- TPS61131PWR
- Manufacturer:
- Texas Instruments
- Category:
- Voltage Regulators - Linear + Switching
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
TPS61131PWR.pdf
- Description:
- IC REG DL BUCK/BST/LNR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,615
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Product details
Overview
TPS61131PWR from Texas Instruments is a synchronous SEPIC and flyback DC-DC converter with integrated 200-mA reverse-voltage-protected LDO, designed for dual-output power management in portable battery-powered systems. It delivers up to 300 mA at 3.3 V from 1.8–5.5 V input, features 40-μA quiescent current, fixed 3.3-V DC-DC output, and fixed 3.3-V LDO output - used in MP3 players, PDAs, and USB-powered devices.
For engineers reviewing the TPS61131PWR datasheet, TPS61131PWR pinout, TPS61131PWR application, or TPS61131PWR equivalent, key selection considerations include its dual-output architecture (SEPIC + LDO), low-battery detection (LBI/LBO), power-good signaling (PGOOD), and thermal performance in TSSOP-16 packaging under 1.8–5.5 V input conditions.
Technical Context
The TPS61131PWR implements a fixed-frequency (400–600 kHz) PWM-controlled synchronous SEPIC topology with integrated N- and P-channel MOSFETs, enabling buck-boost operation without polarity inversion. Its control loop uses feedforward regulation of input voltage, output voltage, and NMOS switch voltage drop to minimize error amplifier burden.
It integrates a dedicated 200-mA LDO with reverse-voltage protection, independently enabled via LDOEN, and supports post-regulation of the SEPIC output or direct battery-derived output. The device includes undervoltage lockout (~1.6 V), soft-start limiting inrush current, and antiringing circuitry to suppress SW-node oscillation in discontinuous conduction mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V - supports single-cell Li-ion (2.5–4.2 V), dual/triple alkaline/NiMH (1.8–5.5 V) |
| DC-DC Output Voltage | Fixed 3.3 V ±3% - eliminates external feedback resistors; stable for logic rail generation |
| LDO Output Voltage | Fixed 3.3 V ±3% - provides second regulated rail with reverse-voltage protection and independent enable |
| DC-DC Max Output Current | 300 mA at 3.3 V - sufficient for microcontroller cores, display bias, or peripheral ICs |
| Quiescent Current | 40 μA typical - enables >100-hour standby in low-power portable applications |
| Switching Frequency | 500 kHz nominal - balances efficiency, inductor size (22 μH), and EMI filtering requirements |
| Peak Switch Current Limit | 1300 mA typical - sets maximum energy transfer per cycle; protects against overload and short-circuit |
| Thermal Resistance (RθJA) | 100.5 °C/W (TSSOP-16) - requires moderate PCB copper area for 85°C ambient operation at full load |
Pinout & Package
TPS61131PWR is housed in a 16-pin TSSOP package (5.00 mm × 4.40 mm) with exposed thermal pad connected to PGND. Pin 1 is SWP; pin 16 is VOUT. The thermal pad must be soldered to achieve specified thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 7) | DC-DC enable input | Active-high logic: connects to VBAT to enable converter; ties to GND for shutdown and full load disconnect |
| LDOEN (Pin 8) | LDO enable input | Independent active-high control: enables LDO even if DC-DC stage is disabled; referenced to LDOIN |
| VOUT (Pin 16) | SEPIC output | Main regulated 3.3-V supply rail; drives downstream logic, memory, or analog circuitry |
| LDOOUT (Pin 10) | LDO output | Second fixed 3.3-V rail; reverse-voltage protected; usable for I/O, sensors, or backup domains |
| PGOOD (Pin 14) | Power-good indicator | Open-drain output asserting high when VOUT is within 90–95% of target - enables sequenced power-up of downstream ICs |
| LBI (Pin 5) | Low-battery comparator input | Monitors scaled battery voltage; triggers LBO when input drops below 500 mV (±10 mV hysteresis) |
| LBO (Pin 13) | Low-battery output | Open-drain flag indicating battery depletion; used for system-level sleep/wake or UI alert |
| SWP (Pin 1) / SWN (Pin 2) | SEPIC switch terminals | Connect to coupled inductor windings; SWP is rectifying PMOS source, SWN is NMOS drain |
| PGND (Pin 3) | Power ground | Return path for high-current switching nodes; must tie to thermal pad and separate from signal GND at single point |
| GND (Pin 12) | Control/logic ground | Reference for EN, SKIPEN, LDOEN, FB, and internal comparators; isolated from PGND except at star point |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous SEPIC + integrated LDO | Dual independent regulated outputs (3.3 V/300 mA + 3.3 V/200 mA) in one IC - reduces BOM count and board space vs discrete solutions |
| 40-μA quiescent current | Enables multi-day battery life in always-on monitoring or real-time clock subsystems powered from same cell |
| Low-battery detection with hysteresis | 500 mV threshold with 10 mV hysteresis on LBI - prevents chatter during gradual discharge; programmable via resistor divider |
| Antiringing switch | Clamps SW node to VBAT during DCM - reduces radiated EMI by >10 dB in 30–100 MHz band without external snubbers |
| Load disconnect during shutdown | Backgate diode of high-side PMOS turned off when EN = low - ensures true zero-load current draw from battery |
| Overtemperature protection | 140°C trip with 20°C hysteresis - prevents thermal runaway during sustained overload or poor heatsinking |
Applications
| Portable Audio Devices | Handheld Industrial Scanners |
|---|---|
Use Scenario: MP3 player powered by single-cell Li-ion battery (2.5–4.2 V) requiring stable 3.3-V logic rail and clean 3.3-V audio DAC supply. IC Role / Device Role / Timing Role: TPS61131PWR provides primary 3.3-V rail for microcontroller and secondary 3.3-V rail for audio codec, with independent LDO enable for power sequencing. Use Value: Dual fixed outputs eliminate need for external regulators; low quiescent current extends playback time; PGOOD enables safe boot sequence. |
Use Scenario: Rugged barcode scanner using dual alkaline cells (2.4–3.2 V) powering MCU, laser driver, and CMOS imager. IC Role / Device Role / Timing Role: TPS61131PWR generates 3.3-V main rail and 3.3-V sensor rail; LBI monitors battery voltage to trigger low-power mode before shutdown. Use Value: Wide 1.8–5.5 V input accommodates fresh-to-dead battery range; load disconnect preserves battery charge during idle periods. |
| USB-Powered Diagnostic Tools | Medical Patient Monitors |
Use Scenario: Portable ECG tool operating from USB (5 V) or internal Li-ion, needing isolated 3.3-V rails for analog front-end and digital processing. IC Role / Device Role / Timing Role: TPS61131PWR's LDO accepts USB input directly while SEPIC runs from battery - enabling seamless source switchover. Use Value: Reverse-voltage protected LDO prevents backfeed from USB to battery; independent LDOEN allows software-controlled rail activation. |
Use Scenario: Battery-backed vital signs monitor requiring fail-safe power with battery health monitoring and clean analog supply. IC Role / Device Role / Timing Role: TPS61131PWR supplies 3.3-V MCU rail and 3.3-V ADC reference rail; PGOOD and LBO feed into system supervisor MCU. Use Value: Integrated power-good and low-battery flags reduce external monitoring components; antiringing design meets medical EMC standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output DC-DC converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61088RHLR | Single-output boost (not SEPIC); higher 8-A switch current; no integrated LDO; 2.7–12 V input | Requires external LDO for second rail; better suited for high-current single-rail apps like displays | Select when only one high-current rail is needed and board space allows discrete LDO + layout complexity |
| MAX17222ETA+ | Single-output boost; 300-mA output; no LDO; 0.4–5.5 V input; 1.4-μA IQ; 1.8-mm × 1.8-mm WLP | Ultra-low IQ but lacks dual output, PGOOD, LBI/LBO, and thermal protection | Select for minimal-quiescent ultra-portable devices where second rail is generated elsewhere or not required |
Compared with TPS61131PWR, TPS61088RHLR offers higher current but no LDO or battery monitoring, while MAX17222ETA+ achieves lower IQ but sacrifices all supervision and dual-rail capability - making TPS61131PWR uniquely balanced for cost-sensitive, feature-complete portable power.
Availability
TPS61131PWR is available at Aetrix Electronics and suitable for portable medical devices, handheld industrial scanners, and USB-powered diagnostic tools requiring stable dual 3.3-V output supply with battery health monitoring and low-noise operation.
Supply support for TPS61131PWR 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 delivering analog and embedded processing solutions, with over 50 years of power management innovation and broad distribution across industrial, automotive, and consumer markets.
The TPS6113x product line was engineered specifically for compact, battery-powered portable electronics requiring dual regulated outputs, low quiescent current, and integrated supervision - targeting MP3 players, PDAs, and handheld instrumentation.
FAQ
What is the DC-DC output voltage configuration of the TPS61131PWR?
The TPS61131PWR features a fixed 3.3-V DC-DC output voltage, eliminating the need for external feedback resistors. This configuration is factory-trimmed to ±3% accuracy across temperature and load, ensuring stable logic rail generation without design overhead. Unlike the adjustable TPS61130PWR, the TPS61131PWR does not require an FB network - simplifying layout and reducing component count in production designs.
Does the TPS61131PWR support independent enable control for its LDO and DC-DC stages?
Yes, the TPS61131PWR provides fully independent enable control: EN (Pin 7) controls the SEPIC converter, while LDOEN (Pin 8) controls the integrated LDO. Both inputs are active-high and referenced to their respective supply domains (VBAT for EN, LDOIN for LDOEN). This allows flexible power sequencing - for example, enabling the LDO from USB while keeping the DC-DC stage disabled during battery charging.
How does the low-battery detection function work on the TPS61131PWR?
The TPS61131PWR implements a precision low-battery comparator with 500 mV threshold (±10 mV hysteresis) on the LBI pin. When enabled, it compares a scaled-down battery voltage (via external resistor divider) to this internal reference. If the scaled voltage falls below threshold, LBO (open-drain) pulls low. The function is disabled during shutdown (EN = low), and LBI must never float - it should be tied to GND or VBAT if unused.
What thermal performance can be expected from the TPS61131PWR in TSSOP-16 packaging?
The TPS61131PWR in TSSOP-16 (PW) package has a junction-to-ambient thermal resistance (RθJA) of 100.5 °C/W. Under worst-case conditions (5.5 V input, 300 mA at 3.3 V, 85°C ambient), power dissipation is ~330 mW, resulting in ~118°C junction temperature - within the 125°C max operating limit. Adequate 2-oz copper pour under the thermal pad and PGND connections is essential to maintain reliability.
Can the TPS61131PWR operate from a USB 5-V source while also supporting battery backup?
Yes - the TPS61131PWR's LDO stage accepts input from any source including USB 5 V (via LDOIN), while the SEPIC stage runs from battery. With LDOEN asserted and EN deasserted, the LDO delivers clean 3.3 V from USB, isolating the battery. When USB is removed, enabling EN activates the SEPIC to sustain both rails from battery. No external OR-ing FET is needed due to the LDO's reverse-voltage protection.
TPS61131PWR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Topology:
- Step-Down/Step-Up (Buck/Boost) (1), Linear (LDO) (1)
- Number of Outputs:
- 2
- Frequency - Switching:
- 500kHz
- Voltage/Current - Output 1:
- 3.3V, 300mA
- Voltage/Current - Output 2:
- 3.3V, 320mA
- Voltage/Current - Output 3:
- -
- w/LED Driver:
- No
- w/Supervisor:
- No
- w/Sequencer:
- No
- Voltage - Supply:
- 1.8V ~ 7V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
TPS61131PWR FAQ
1.How can I place an order for TPS61131PWR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61131PWR 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 TPS61131PWR reliable?
The price and inventory of TPS61131PWR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61131PWR is usually 5 days.
3.What payment methods are accepted for TPS61131PWR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61131PWR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61131PWR?
TPS61131PWR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61131PWR 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 TPS61131PWR?
For technical support, including TPS61131PWR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61131PWR requirements.
6.How does Aetrix verify that TPS61131PWR is sourced from the original manufacturer or authorized distributors?
All TPS61131PWR 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 TPS61131PWR meets industry standards.
7.What is the process for return or replacement of TPS61131PWR?
All TPS61131PWR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61131PWR, 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 TPS61131PWR part is unused and in its original packaging.
Return procedure for TPS61131PWR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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