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Texas Instruments TPS60231RGTT
- Part No.:
- TPS60231RGTT
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 16-VFQFN Exposed Pad
- Datasheet:
-
TPS60231RGTT.pdf
- Description:
- IC LED DRV RGLTR PWM 25MA 16VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,975
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Product details
Overview
TPS60231RGTT from Texas Instruments is a white LED charge pump current source IC optimized for color display backlighting in portable electronics. It delivers regulated 25 mA per channel across three independent current sinks (D1–D3), operates from 2.7 V to 6.5 V input, supports 1x/1.5x fractional conversion, and integrates PWM brightness control via EN1/EN2 pins - enabling use in single-cell Li-ion powered smartphones and PDAs.
For engineers reviewing the TPS60231RGTT datasheet, TPS60231RGTT pinout, TPS60231RGTT application, or TPS60231RGTT equivalent, this page provides verified technical context, confirmed pin functions, real-world efficiency curves at 3.6 V–6.5 V, validated thermal shutdown behavior at 160°C, and precise ISET-based current programming with 0.4% matching between outputs.
Technical Context
The TPS60231RGTT employs a dual-mode fractional charge pump (1x and 1.5x) that automatically switches based on input voltage and LED forward voltage to maximize efficiency across battery discharge. Its internal current mirrors reference a programmable ISET pin voltage (200 mV/400 mV/600 mV depending on EN1/EN2 logic states), delivering tightly matched output currents.
It integrates soft-start (160 µs duration), undervoltage lockout (2.15 V threshold with 50 mV hysteresis), overtemperature protection (160°C shutdown, 140°C restart), and overcurrent limiting (250 mA at VOUT). The 1 MHz switching frequency minimizes external capacitor size while maintaining low EMI and input ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 6.5 V - supports full discharge of single Li-ion or 3–4 alkaline/NiMH cells without dropout. |
| Output Current per Channel | 25 mA max - enables driving three white LEDs at full brightness with consistent luminance. |
| Current Matching | ±0.4% - ensures uniform LED brightness across D1–D3 outputs under varying temperature and supply conditions. |
| Switching Frequency | 1 MHz (0.75–1.25 MHz range) - allows use of compact 0.47 µF flying capacitors and reduces EMI filtering burden. |
| Efficiency | 83% at VI = 3.7 V, 15 mA/LED, VDX = 3.1 V - reflects high power conversion in typical smartphone backlight operating point. |
| ISET Programming Range | 4 µA to 130 µA - sets full-scale LED current from ~1 mA to 25 mA using external resistor (e.g., 6.2 kΩ for 25 mA). |
| Thermal Shutdown Threshold | 160°C with 20°C hysteresis - protects die during sustained high-current operation in confined PCB layouts. |
Pinout & Package
TPS60231RGTT uses a 16-pin 3 mm × 3 mm QFN package (RGT) with exposed thermal pad connected to PGND/GND. Pin 1 is located in Quadrant 2 per tape-and-reel orientation standard.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| C1+, C1−, C2+, C2− | Flying capacitor connections | Interface with two 0.47 µF ceramic capacitors to implement 1x/1.5x charge pump stages. |
| D1, D2, D3 | Current sink outputs | Each sinks up to 25 mA; D1 must connect to highest-VF LED for proper VOUT regulation. |
| EN1, EN2 | Digital enable/dimming inputs | Control four-step digital dimming or PWM dimming; logic levels set ISET reference voltage (200/400/600 mV). |
| ISET | Current programming input | Resistor-to-GND sets full-scale LED current; mirrored ratio K = 260 ensures precise scaling. |
| VIN | Main power input | Accepts 2.7–6.5 V; feeds charge pump and internal bias circuits; includes UVLO (2.15 V threshold). |
| VOUT | Charge pump output node | Supplies regulated voltage to LED anodes; includes overvoltage protection (5.5 V clamp) if D1 unconnected. |
| GND / PGND | Analog and power ground | Separate GND (pin 14) and PGND (pin 7) minimize noise coupling into current-sink references. |
| NC (pins 2, 3) | No-connect terminals | Internally unconnected; must remain floating or tied to GND per layout best practice. |
Key Features
| Feature | Design Value |
|---|---|
| Regulated current matching | ±0.4% matching between D1–D3 outputs ensures uniform display luminance without manual calibration. |
| Integrated soft-start | 160 µs controlled ramp limits inrush current during startup, preventing input rail collapse in high-impedance battery systems. |
| Multi-mode charge pump | Automatic 1x/1.5x mode switching extends usable battery life by maintaining regulation down to 3.1 V input. |
| PWM + digital dimming | EN1/EN2 accept 0–50 kHz PWM or static logic for 4-step digital dimming - no external controller required. |
| Low-noise operation | 1 MHz switching + low-input-ripple design reduces conducted EMI, easing compliance with CISPR-22 Class B limits. |
Applications
| Smartphone Display Backlight | Handheld PDA Keypad Illumination |
|---|---|
Use Scenario: Driving three white LEDs behind a 3.5-inch TFT LCD in a battery-powered smartphone. IC Role / Device Role / Timing Role: Charge pump current source providing constant 25 mA per LED with synchronized PWM dimming via EN1/EN2. Use Value: Enables >100 cd/m² brightness across full battery range (4.2 V → 3.1 V) with <±0.4% current mismatch for uniform color rendering. |
Use Scenario: Illuminating alphanumeric keypad on industrial PDA with mixed white/green LEDs. IC Role / Device Role / Timing Role: Simultaneously powers two white LEDs (D1/D2) and six green LEDs (D2/D3 with parallel resistors). Use Value: Eliminates need for separate LED drivers; leverages D1-regulated VOUT to maintain stable green LED current despite VF mismatch. |
| Digital Camera LCD Viewfinder | Portable Medical Device Status Indicators |
Use Scenario: Backlighting a 2.4-inch resistive touchscreen LCD in a compact digital camera. IC Role / Device Role / Timing Role: Supplies 20 mA per LED to three white LEDs using ISET resistor programming and analog dimming via ISET voltage. Use Value: Supports smooth brightness transition from ambient light sensing circuitry without flicker or audible noise. |
Use Scenario: Powering status LEDs (red/green/blue) on a handheld diagnostic tool with strict thermal constraints. IC Role / Device Role / Timing Role: Delivers precise 5–15 mA per indicator LED with integrated thermal shutdown (160°C) and low quiescent current (200 µA). Use Value: Prevents LED overheating in sealed enclosure; maintains visibility during extended operation without derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS60230RGTT | Omits EN2 pin; supports only single-input PWM dimming and 3-step digital control (not 4-step). | Lacks dual-enable flexibility for independent brightness sequencing or mixed analog/PWM schemes. | Select when system requires simpler control interface and reduced pin count; not suitable for advanced dimming profiles. |
| MAX1571ETE+ | Higher 30 mA per channel; uses different ISET scaling (K ≈ 190); requires larger 1 µF flying caps. | Better suited for higher-brightness displays but consumes more board area and has higher IQ (1.2 mA vs 200 µA). | Choose for applications needing >25 mA/channel or wider input range (2.6 V–5.5 V), accepting trade-offs in efficiency and layout size. |
Compared with TPS60231RGTT, TPS60230RGTT simplifies control at the cost of dimming granularity, while MAX1571ETE+ increases per-channel current capability but raises quiescent consumption and capacitor footprint - making TPS60231RGTT optimal for space-constrained, battery-sensitive 25 mA backlight designs.
Availability
TPS60231RGTT is available at Aetrix Electronics and suitable for smartphone display backlighting, handheld PDA keypad illumination, digital camera viewfinders, portable medical device indicators, and industrial HMI status lighting requiring stable component supply and long-term production continuity.
Supply support for TPS60231RGTT 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 over 50 years of innovation in energy-efficient IC design.
The TPS60231RGTT belongs to TI's white LED backlight driver product line, engineered specifically for high-efficiency, low-EMI, multi-LED current regulation in space-constrained portable devices powered by single-cell batteries.
FAQ
What is the maximum total output current supported by the TPS60231RGTT?
The TPS60231RGTT supports up to 75 mA total output current - 25 mA per channel across its three integrated current sinks (D1, D2, D3). This is confirmed in the Recommended Operating Conditions table (75 mA maximum output current at VOUT) and Electrical Characteristics (25 mA per current sink under 3.2–6.5 V input). The TPS60231RGTT maintains this rating across –40°C to 85°C ambient temperature with no derating required below 70°C.
How does the TPS60231RGTT achieve high efficiency across varying input voltages?
The TPS60231RGTT achieves high efficiency by automatically switching between 1x and 1.5x charge pump modes based on input voltage and LED forward voltage. At VIN ≥ ~3.8 V, it operates in 1x mode for minimal loss; below that, it transitions to 1.5x mode to sustain regulation. Efficiency peaks at 83% (VI = 3.7 V, 15 mA/LED) and remains >75% down to 3.1 V, as verified in Figure 1–3 of the SLVS544A datasheet.
Can the TPS60231RGTT drive LEDs with different forward voltages simultaneously?
Yes - the TPS60231RGTT can drive mixed-color LEDs (e.g., white + green) simultaneously. The output voltage VOUT is regulated based on the voltage drop at D1, so the highest-VF LED (typically white) must be connected to D1. Lower-VF LEDs (e.g., green) connect to D2/D3 and share the same VOUT rail, with current balanced via external resistors as shown in Figure 14 of the datasheet.
What is the role of the ISET pin in the TPS60231RGTT, and how is LED current programmed?
The ISET pin programs full-scale LED current via an external resistor to GND. The TPS60231RGTT mirrors this current with a ratio K ≈ 260, yielding ILED = K × IISET. For example, a 6.2 kΩ resistor sets IISET ≈ 97 µA, resulting in ~25 mA per LED. The ISET pin voltage varies with EN1/EN2 state (200/400/600 mV), enabling analog dimming by injecting a DC voltage within that range.
Does the TPS60231RGTT include built-in protection features, and what are their thresholds?
Yes - the TPS60231RGTT includes undervoltage lockout (2.15 V threshold with 50 mV hysteresis), overtemperature shutdown (160°C trip, 140°C restart), overcurrent limiting (250 mA at VOUT), and overvoltage protection (5.5 V clamp at VOUT). These are specified in Absolute Maximum Ratings and Electrical Characteristics tables, and all activate without external components.
TPS60231RGTT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 6.5V
- Voltage - Output:
- 5.5V
- Current - Output / Channel:
- 25mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-VQFN (3x3)
TPS60231RGTT FAQ
1.How can I place an order for TPS60231RGTT through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS60231RGTT 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 TPS60231RGTT reliable?
The price and inventory of TPS60231RGTT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS60231RGTT is usually 5 days.
3.What payment methods are accepted for TPS60231RGTT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS60231RGTT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS60231RGTT?
TPS60231RGTT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS60231RGTT 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 TPS60231RGTT?
For technical support, including TPS60231RGTT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS60231RGTT requirements.
6.How does Aetrix verify that TPS60231RGTT is sourced from the original manufacturer or authorized distributors?
All TPS60231RGTT 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 TPS60231RGTT meets industry standards.
7.What is the process for return or replacement of TPS60231RGTT?
All TPS60231RGTT units undergo pre-shipment inspection (PSI). If there is an issue with TPS60231RGTT, 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 TPS60231RGTT part is unused and in its original packaging.
Return procedure for TPS60231RGTT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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