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Texas Instruments TPS61120RSAR
- Part No.:
- TPS61120RSAR
- Manufacturer:
- Texas Instruments
- Category:
- Power Management - Specialized
- Package:
- 16-VQFN Exposed Pad
- Datasheet:
-
TPS61120RSAR.pdf
- Description:
- IC CONV BOOST DUAL-OUT 16-QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,376
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Product details
Overview
TPS61120RSAR from Texas Instruments is a synchronous boost converter with integrated 200-mA LDO, designed for single-cell Li-Ion/Li-Polymer or multi-cell alkaline/NiMH battery-powered systems. It delivers up to 500 mA at adjustable DC-DC output (2.5–5.5 V) and supports post-regulated LDO output (0.9–5.5 V), enabling dual-rail power in portable audio, PMU subsystems, and USB-powered instrumentation.
For engineers reviewing the TPS61120RSAR datasheet, TPS61120RSAR pinout, TPS61120RSAR application, or TPS61120RSAR equivalent, key selection criteria include its 40-µA quiescent current, 1.8–5.5-V input range, 500-kHz fixed-frequency PWM operation, and dual-output architecture with independent enable control (EN/LDOEN) and power-good signaling (PGOOD).
Technical Context
The TPS61120RSAR implements a fixed-frequency, multiple feed-forward PWM controller that monitors VIN, VOUT, and NMOS switch voltage drop to directly adjust duty cycle-bypassing slow error-amplifier loop latency. Peak switch current is internally limited to 1300 mA (typ), with thermal shutdown at 140°C and 20°C hysteresis.
Its synchronous rectifier uses integrated N- and P-channel MOSFETs (RDS(on) = 200–500 mΩ) and dual ground pins (GND/PGND) to isolate control logic from high-current paths. The antiringing switch clamps SW node ringing during discontinuous conduction mode, reducing EMI without external snubbers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8 V to 5.5 V - supports full discharge curve of single-cell Li-ion (2.5–4.2 V) and two-to-four-cell alkaline/NiMH (1.8–5.5 V) |
| DC-DC Output Range | Adjustable 2.5 V to 5.5 V - set via external FB resistor divider; reference voltage 500 mV ±3% |
| LDO Output Range | Adjustable 0.9 V to 5.5 V - configured via LDOSENSE feedback; supports back-bias operation from external rails |
| Switch Current Limit | 1300 mA (typ) - limits peak inductor current to prevent saturation and thermal runaway under load transients |
| Quiescent Current | 40 µA (typ) - enables >100-hour standby in low-power IoT sensors powered by coin cells or Li-ion |
| Efficiency | Up to 95% - achieved via synchronous rectification and optimized gate drive, critical for battery runtime extension |
| Shutdown Current | 0.2 µA (max) - isolates load from battery during EN = low, preventing parasitic drain in off-state |
Pinout & Package
VQFN-16 (RSA) package, 4.0 mm × 4.0 mm, 0.5-mm pitch, with exposed thermal pad (Pin 17) for enhanced PCB heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 5) | DC-DC enable input | Active-high logic: drives internal regulator when pulled ≥0.8×VBAT; disables boost stage and disconnects load from battery |
| LDOEN (Pin 6) | LDO enable input | Independent active-high control: enables LDO regardless of EN state; logic threshold referenced to LDOIN |
| FB (Pin 13) | DC-DC feedback input | Connects to resistor divider from VOUT to GND; sets output voltage as VOUT = 0.5 V × (1 + R1/R2) |
| LDOSENSE (Pin 9) | LDO feedback input | For adjustable LDO: connects to LDOOUT via resistor divider; for fixed versions, shorted to LDOOUT |
| PGOOD (Pin 12) | Power-good open-drain output | Asserts low impedance when VOUT is within ±3% of target; used to sequence downstream LDOs or reset microcontrollers |
| SWP (Pin 15), SWN (Pin 16) | Boost switch terminals | SWP connects to inductor high-side; SWN connects to inductor low-side and PGND; synchronous rectifier path |
| GND (Pin 10), PGND (Pin 1) | Separate ground returns | GND: reference for logic/control circuitry; PGND: high-current return for boost switch; must be joined at single point near GND |
Key Features
| Feature | Design Value |
|---|---|
| Synchronous boost + integrated LDO | Enables compact dual-output power architecture without discrete regulators-reduces BOM count and PCB area by ~30% vs discrete solution |
| Load disconnect during shutdown | Special backgate control circuit blocks reverse current through PMOS body diode, eliminating need for external load-switch FET |
| Low-EMI antiringing switch | Clamps SW node to VBAT during DCM, suppressing >100 MHz ringing and easing EMC compliance without added ferrites or RC snubbers |
| Programmable low-battery detection | LBI input accepts resistive divider to set custom battery cutoff (e.g., 3.0 V); LBO open-drain output signals host MCU before brownout |
| Power save mode (SKIPEN) | Disables fixed-frequency PWM at light loads; pulses only as needed to maintain regulation-boosts light-load efficiency by 15–25% |
Applications
| Portable Audio Amplifiers | USB-Powered Instrumentation |
|---|---|
|
Use Scenario: Battery-powered headphone amplifier requiring clean 3.3-V rail for DAC and 1.8-V rail for digital logic. IC Role / Device Role / Timing Role: TPS61120RSAR generates regulated 3.3 V from 3.7-V Li-ion cell via boost stage, then derives 1.8 V via LDO for noise-sensitive digital core. Use Value: Synchronous rectification and low 40-µA quiescent current extend playback time; LDO's 60-dB PSRR at 100 kHz suppresses switching noise on analog supply. |
Use Scenario: Handheld multimeter powered from USB (5 V) or internal Li-ion (3.7 V), needing stable 3.3-V MCU rail and 2.5-V ADC reference. IC Role / Device Role / Timing Role: TPS61120RSAR operates in dual-input mode: boosts USB 5 V down to 3.3 V (via LDO), or boosts Li-ion 3.7 V to 5 V then regulates to 2.5 V via LDO. Use Value: Back-bias capability allows seamless source switchover; PGOOD ensures MCU boot only after both rails are valid. |
| Wearable Health Sensors | Industrial Data Loggers |
|
Use Scenario: Optical pulse oximeter using LED drivers and analog front-end, operating from CR2032 coin cell (2.0–3.0 V). IC Role / Device Role / Timing Role: TPS61120RSAR boosts 2.2 V to 3.3 V for microcontroller and sensor interface, while LDO provides ripple-free 2.8 V for precision op-amps. Use Value: 1.8-V minimum input enables full coin-cell utilization; 0.2-µA shutdown current prevents battery depletion during multi-week sleep cycles. |
Use Scenario: Remote environmental logger with GSM modem, requiring 3.3-V MCU rail and 4.2-V modem power from 3.6-V Li-SOCl₂ primary cell. IC Role / Device Role / Timing Role: TPS61120RSAR boosts 3.6 V to 4.2 V for modem transmit bursts, while LDO supplies steady 3.3 V for MCU and flash memory. Use Value: 1300-mA switch current limit supports 500-mA modem peak loads; thermal shutdown protects against sustained high-temp field operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-output boost-LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61220DRVR | Single-output boost only (no integrated LDO); 500-mA switch; 20-µA IQ; 2.5–5.5-V output | Requires external LDO for second rail; smaller 2-mm × 2-mm WSON package | Select when space-constrained and LDO can be added externally; not suitable for true dual-rail integration. |
| MAX8640YETA+ | Fixed 3.3-V boost + 300-mA LDO; 25-µA IQ; 0.9–3.6-V input; TDFN-10 package | Fixed outputs only; no adjustable FB/LDOSENSE; lower max input voltage | Select for cost-sensitive designs needing only 3.3-V/3.3-V dual rail and <3.6-V input; lacks flexibility of TPS61120RSAR. |
Compared with TPS61120RSAR, TPS61220DRVR reduces footprint but increases system complexity and component count, while MAX8640YETA+ offers lower IQ and smaller size at the expense of output adjustability and input voltage range-making TPS61120RSAR optimal for flexible, battery-life-critical dual-rail designs.
Availability
TPS61120RSAR is available at Aetrix Electronics and suitable for portable medical devices, USB-C peripheral power management, and industrial data loggers requiring stable component supply across extended product lifecycles.
Supply support for TPS61120RSAR 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 ICs, with decades of expertise in battery-powered system solutions.
The TPS6112x product line was engineered specifically for ultra-low-power, dual-output power conversion in space-constrained portable electronics-balancing high efficiency, small footprint, and robust protection features.
FAQ
What is the maximum output current capability of the TPS61120RSAR boost stage?
The TPS61120RSAR boost stage delivers up to 500 mA at typical operating conditions (e.g., VIN = 2.4 V, VOUT = 5.0 V). Its 1300-mA peak switch current limit supports transient loads, but continuous output depends on thermal design and input voltage-derating applies above 85°C ambient. The TPS61120RSAR datasheet specifies 500 mA as the guaranteed minimum under recommended conditions.
Can the TPS61120RSAR operate with a 1.8-V input and still regulate a 3.3-V output?
Yes, the TPS61120RSAR is explicitly rated for 1.8-V minimum input and can regulate 3.3-V output across its full temperature range (–40°C to 85°C). At 1.8-V input, efficiency drops due to higher duty cycle, but the device maintains regulation with adequate layout and component selection per TI's SLVS427D layout guidelines.
How does the LDO in the TPS61120RSAR handle back-bias conditions?
The TPS61120RSAR LDO supports back-bias operation: if an external supply (e.g., USB 5 V) is applied to LDOOUT while LDOIN is unpowered, current flows from LDOOUT into LDOIN-enabling seamless source switchover. However, LDOEN must be disabled when LDOIN < LDOOUT to block reverse current and prevent damage.
What is the purpose of the separate GND and PGND pins on the TPS61120RSAR?
GND serves as the reference for all control circuitry (EN, FB, LDOSENSE), while PGND carries high pulsed currents from the boost switch (SWN). Separating them prevents ground bounce from corrupting feedback accuracy. Per TI's layout guidance, GND and PGND must connect at a single point near Pin 10 (GND) to avoid noise coupling into sensitive analog nodes.
Does the TPS61120RSAR require external components for soft-start functionality?
No-the TPS61120RSAR integrates soft-start: during enable, it precharges the output capacitor and limits peak switch current to 40% of nominal until regulation is achieved. This eliminates inrush current spikes and obviates external soft-start capacitors, simplifying design and reducing BOM count for the TPS61120RSAR.
TPS61120RSAR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Applications:
- Handheld/Mobile Devices
- Current - Supply:
- 10µA
- Voltage - Supply:
- 1.8V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (4x4)
TPS61120RSAR FAQ
1.How can I place an order for TPS61120RSAR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61120RSAR 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 TPS61120RSAR reliable?
The price and inventory of TPS61120RSAR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61120RSAR is usually 5 days.
3.What payment methods are accepted for TPS61120RSAR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61120RSAR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61120RSAR?
TPS61120RSAR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61120RSAR 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 TPS61120RSAR?
For technical support, including TPS61120RSAR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61120RSAR requirements.
6.How does Aetrix verify that TPS61120RSAR is sourced from the original manufacturer or authorized distributors?
All TPS61120RSAR 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 TPS61120RSAR meets industry standards.
7.What is the process for return or replacement of TPS61120RSAR?
All TPS61120RSAR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61120RSAR, 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 TPS61120RSAR part is unused and in its original packaging.
Return procedure for TPS61120RSAR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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