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Texas Instruments TPS61090RSAR
- Part No.:
- TPS61090RSAR
- Manufacturer:
- Texas Instruments
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS61090RSAR.pdf
- Description:
- IC REG BOOST ADJ 2A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:9,682
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Product details
Overview
TPS61090RSAR from Texas Instruments is a synchronous boost converter IC designed for single-cell Li-ion or dual-cell alkaline/NiMH battery-powered systems. It delivers up to 500 mA at 5 V from as low as 1.8 V input, features 96% peak efficiency, 600 kHz fixed-frequency PWM operation, and integrated low-battery detection with LBI/LBO pins.
For engineers reviewing the TPS61090RSAR datasheet, TPS61090RSAR pinout, TPS61090RSAR application, or TPS61090RSAR equivalent, this page provides verified functional context, validated pin roles, confirmed efficiency behavior across load range, real-world output voltage programming constraints, and documented thermal and EMI mitigation features - all specific to the TPS61090RSAR variant.
Technical Context
The TPS61090RSAR implements a fixed-frequency, multiple feedforward PWM controller with synchronous rectification using internal N- and P-channel MOSFETs. Input voltage, output voltage, and NMOS switch voltage drop are directly monitored to adjust duty cycle without relying solely on error amplifier loop dynamics.
It supports three operational modes: PWM (medium–heavy load, 600 kHz), power-save mode (light load, variable frequency), and external clock synchronization (SYNC pin). Peak switch current is internally limited to 2200 mA typical, with overtemperature protection activating at 140°C and undervoltage lockout engaging below ~1.6 V on VBAT.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V - supports one-cell Li-ion (2.5–4.2 V) and two-cell alkaline/NiMH (2.4–3.2 V) without external regulation. |
| Output Voltage | Adjustable 1.8 V to 5.5 V - set via external resistor divider on FB pin; feedback reference is 500 mV ±10 mV. |
| Switch Current Limit | 2200 mA typical - limits inductor and switch stress during startup or overload; enables 500 mA output at 5 V from 1.8 V input. |
| Quiescent Current | 20 µA typical - minimizes battery drain in active standby; drops to 0.1 µA in shutdown. |
| Efficiency | 96% peak - achieved via synchronous rectification (no Schottky loss); >85% maintained at 10 mA load with 1.8 V → 3.3 V conversion. |
| Switching Frequency | 600 kHz nominal - fixed PWM mode; programmable via SYNC pin (500–700 kHz range) or forced into power-save (PFM) mode. |
| Low-Battery Threshold | 500 mV on LBI pin - user-programmable via resistor divider; 10 mV hysteresis prevents chatter during battery sag. |
Pinout & Package
TPS61090RSAR is housed in a 16-pin VQFN package (4.0 mm × 4.0 mm, RSA suffix), with exposed PowerPAD™ thermally connected to PGND. The package supports high-current routing and thermal dissipation in space-constrained portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 11) | Enable control input | Active-high logic: ties to VBAT to enable; GND disables regulator and disconnects load from battery. |
| FB (Pin 14) | Feedback input | Monitors output voltage divider; regulates output by maintaining 500 mV at this pin. |
| GND (Pin 13) | Logic ground reference | Reference for control circuitry and error amplifier; must be separated from PGND except at single-point PCB connection. |
| LBI (Pin 9) | Low-battery comparator input | Accepts scaled battery voltage; comparator activates when input falls below 500 mV (hysteresis = 10 mV). |
| LBO (Pin 12) | Low-battery open-drain output | Active-low flag; requires external pullup (e.g., 1 MΩ to VOUT); high-impedance when device is disabled. |
| PGND (Pins 5,6,7) | Power ground return | Return path for boost switch and rectifier; connects to PowerPAD™; must be low-inductance copper pour. |
| SYNC (Pin 10) | Mode control input | Low = power-save mode; high = fixed-frequency PWM; external clock signal forces synchronization (500–700 kHz). |
| SW (Pins 3,4) | Switch node | Connection point between inductor and internal boost/rectifier switches; high dv/dt node requiring careful layout. |
| VBAT (Pin 8) | Main input supply | Accepts 1.8–5.5 V; includes undervoltage lockout (~1.6 V threshold) and soft-start circuitry. |
| VOUT (Pins 1,15,16) | Regulated output | Delivers up to 500 mA; paralleled pins reduce IR drop and improve current handling. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated antiringing switch | Dampens SW-node ringing in discontinuous conduction mode, reducing radiated EMI without external snubbers. |
| Load disconnect during shutdown | Internal circuit isolates VOUT from VBAT when EN = low - eliminates battery drain and prevents backfeed through output caps. |
| Synchronous rectification | Replaces lossy Schottky diode with low-RDS(ON) PMOS (55 mΩ), enabling 96% peak efficiency and eliminating reverse recovery losses. |
| Two-ground architecture (GND/PGND) | Separates sensitive analog control ground from high-current power ground - improves stability and reduces noise coupling. |
| Programmable low-battery detection | LBI threshold fixed at 500 mV; external resistor divider allows precise battery voltage monitoring (e.g., 2.8 V cutoff for Li-ion). |
Applications
| Portable Audio Playback | Handheld Medical Sensors |
|---|---|
|
Use Scenario: MP3 player powered by single-cell Li-ion battery (2.8–4.2 V) requiring stable 3.3 V rail for DAC and audio codec. IC Role / Device Role / Timing Role: Primary DC-DC boost regulator generating regulated 3.3 V from declining battery voltage; maintains output within ±3% while battery discharges. Use Value: Enables >10-hour playback by sustaining >90% efficiency down to 2.2 V input; LBO alerts system before brownout. |
Use Scenario: Battery-powered pulse oximeter using dual alkaline cells (2.4–3.2 V) powering 5 V analog front-end and microcontroller. IC Role / Device Role / Timing Role: High-efficiency step-up converter delivering 500 mA at 5 V; operates in power-save mode during sensor idle cycles. Use Value: Extends battery life by minimizing quiescent current (20 µA) and eliminating leakage paths during sleep; PGND/GND separation ensures ADC accuracy. |
| USB-Powered IoT Node | Industrial Handheld Scanner |
|
Use Scenario: BLE-enabled sensor node powered from USB 5 V (via LDO) or backup coin cell; requires 3.3 V for MCU and radio. IC Role / Device Role / Timing Role: Backup boost converter activated when main supply fails; fast start-up (<10 ms) restores 3.3 V rail without system reset. Use Value: Seamless failover enabled by soft-start and load disconnect - prevents data loss during supply transition; SYNC pin allows timing alignment with host MCU clock. |
Use Scenario: Rugged barcode scanner using two NiMH cells (2.4–3.0 V) powering 5 V laser driver and image sensor. IC Role / Device Role / Timing Role: Primary power stage delivering 500 mA at 5 V with robust EMI control for noise-sensitive imaging circuitry. Use Value: Integrated antiringing switch suppresses SW-node oscillation, preventing interference with CMOS image sensor clock signals and reducing FCC test failures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61091RSAR | Fixed 3.3 V output; identical pinout, package, and electrical specs except FB pin is not functional. | No external feedback divider required; simplifies BOM but lacks output voltage flexibility. | Select when 3.3 V is fixed system requirement and board space is constrained - no redesign needed beyond removing R3/R4. |
| TPS61092RSAR | Fixed 5.0 V output; same package and thermal performance; FB pin unused; LBI threshold unchanged. | Optimized for 5 V rails (e.g., USB peripherals); eliminates resistor selection error and improves production yield. | Choose for cost-sensitive 5 V applications where adjustable output adds no value - identical layout and thermal behavior. |
Compared with TPS61091RSAR and TPS61092RSAR, the TPS61090RSAR uniquely supports user-defined output voltages (1.8–5.5 V) via FB pin, making it the only variant suitable for systems requiring non-standard rails like 2.8 V or 4.5 V without external regulation.
Availability
TPS61090RSAR is available at Aetrix Electronics and suitable for portable medical devices, battery-powered audio equipment, USB-failover systems, and industrial handheld scanners requiring stable component supply and long-term manufacturability.
Supply support for TPS61090RSAR 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-efficiency DC-DC conversion.
The TPS6109x family was engineered specifically for ultra-low-power, battery-critical portable applications - delivering high efficiency across wide input ranges while integrating critical system functions like low-battery monitoring and load disconnect in a compact VQFN package.
FAQ
What is the maximum output current capability of the TPS61090RSAR at 5 V output?
The TPS61090RSAR delivers up to 500 mA at 5 V output when supplied from ≥1.8 V input, as confirmed by TI's SLVS484C datasheet Figure 1 and Table 1. This assumes proper thermal design (exposed PowerPAD™ soldered to ≥200 mm² copper), 6.8 µH inductor, and recommended input/output capacitors. Peak switch current limit is 2200 mA typical, supporting transient loads without foldback.
Does the TPS61090RSAR support external synchronization, and what frequency range is acceptable?
Yes, the TPS61090RSAR supports external clock synchronization via the SYNC pin. As specified in Section 7.4 of the datasheet, it accepts external clock signals in the 500–700 kHz range - a ±20% window around its nominal 600 kHz switching frequency. The input must have 30–70% duty cycle; applying VBAT to SYNC disables power-save mode and forces fixed-frequency PWM operation.
How is the low-battery detection threshold programmed on the TPS61090RSAR?
The TPS61090RSAR low-battery threshold is programmed using a resistor divider from VBAT to GND, with the midpoint connected to LBI (Pin 9). Since the internal comparator trips at 500 mV with 10 mV hysteresis, R1 and R2 are selected so that LBI = 500 mV at the desired battery voltage (e.g., R1 = 390 kΩ, R2 = 200 kΩ for ~2.95 V cutoff). LBO (Pin 12) is an open-drain output requiring a pullup resistor (typically 1 MΩ to VOUT).
What is the purpose of separate GND and PGND pins on the TPS61090RSAR?
The TPS61090RSAR uses separate GND (Pin 13) and PGND (Pins 5,6,7) pins to isolate sensitive analog control circuitry from high-current power return paths. GND serves as the reference for FB, EN, SYNC, and LBI/LBO; PGND carries switch and inductor return current. Per TI layout guidelines, they must connect at a single point near the GND pin to prevent ground bounce from corrupting regulation accuracy or low-battery detection.
Can the TPS61090RSAR operate with input voltage below 1.8 V?
No - the TPS61090RSAR has a guaranteed minimum operating input voltage of 1.8 V per Section 7.3 of the datasheet. Undervoltage lockout engages below ~1.6 V, disabling the device. Attempting operation below 1.8 V results in unregulated output, failure to start, or erratic behavior. For sub-1.8 V battery applications (e.g., deeply discharged alkaline), a different boost IC such as TPS61200 is required.
TPS61090RSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN 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):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 2A (Switch)
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
TPS61090RSAR FAQ
1.How can I place an order for TPS61090RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61090RSAR 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 TPS61090RSAR reliable?
The price and inventory of TPS61090RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61090RSAR is usually 5 days.
3.What payment methods are accepted for TPS61090RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61090RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61090RSAR?
TPS61090RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61090RSAR 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 TPS61090RSAR?
For technical support, including TPS61090RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61090RSAR requirements.
6.How does Aetrix verify that TPS61090RSAR is sourced from the original manufacturer or authorized distributors?
All TPS61090RSAR 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 TPS61090RSAR meets industry standards.
7.What is the process for return or replacement of TPS61090RSAR?
All TPS61090RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61090RSAR, 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 TPS61090RSAR part is unused and in its original packaging.
Return procedure for TPS61090RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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