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Texas Instruments TPS68402A0RHFR
- Part No.:
- TPS68402A0RHFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-VFQFN Exposed Pad
- Datasheet:
-
TPS68402A0RHFR.pdf
- Description:
- IC LED DRV RGLTR I2C 24VQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,611
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Product details
Overview
TPS68402A0RHFR from Texas Instruments is a multifunction 3-channel LED driver IC optimized for RGB lighting control in portable electronics. It integrates an auto-switching 1x/1.5x fractional charge pump, three independent 8-bit current DACs (0–25.5 mA per channel), and programmable state machines for autonomous lighting sequences. It operates from 2.7 V to 5.5 V input and supports I²C interface, trigger synchronization, and autonomous operation without host processor intervention - used in keypad backlighting, mood lighting, and function indication.
For engineers reviewing the TPS68402A0RHFR datasheet, TPS68402A0RHFR pinout, TPS68402A0RHFR application, or TPS68402A0RHFR equivalent, key selection criteria include its 24-pin RHF package, 200-nA shutdown current, red-channel battery-direct option (R_TO_BATT), automatic charge pump gain control, and support for external 32.768-kHz clock synchronization across multiple devices.
Technical Context
The TPS68402A0RHFR implements a dual-mode fractional charge pump (1x bypass / 1.5x boost) with digital hysteresis-based gain switching, enabling efficient LED driving across varying battery voltages. Its three independent channels each feature 8-bit current DAC control, 8-bit PWM with selectable linear/logarithmic response, and configurable connection - green/blue tied to VOUT, red optionally routed to VDD via R_TO_BATT bit.
It embeds three 16-instruction programmable state machines executing lighting programs autonomously after I²C configuration. The device supports interrupt generation (INT pin), trigger I/O for multi-device pattern sync, and dual-clock source selection (internal oscillator or external 32.768-kHz CLK32K), with automatic fallback if external clock fails below 15 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input voltage range | 2.7 V to 5.5 V - supports single-cell Li-ion and Li-poly battery systems without external regulation. |
| Max output current per channel | 25.5 mA - sufficient for driving medium-brightness RGB LEDs with tight current matching (±2% typical). |
| Charge pump modes | 1x (bypass) and 1.5x (boost) - automatically switches based on LED headroom; hysteresis prevents oscillation during voltage transitions. |
| PWM resolution & frequency | 8-bit resolution; 256 Hz or 558 Hz - logarithmic mode enables perceptually uniform brightness steps for human-interface lighting. |
| Shutdown current | 200 nA - enables ultra-low-power standby in always-on lighting applications like notification indicators. |
| I²C interface speed | Up to 400 kHz - compatible with standard fast-mode I²C controllers without timing margin concerns. |
| Operating temperature | –30°C to +85°C - validated for consumer handheld and industrial portable equipment environments. |
Pinout & Package
The TPS68402A0RHFR is housed in a 24-pin RHF (QFN-24, 4 mm × 4 mm, 0.5 mm pitch) thermally enhanced package with exposed thermal pad. Pin numbering follows bottom-view orientation per TI documentation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CFLY2P / CFLY1P | Charge pump fly capacitor positive terminals | Two independent flying capacitor connections enable stable 1x/1.5x charge pump operation with low ripple. |
| CFLY2N / CFLY1N | Charge pump fly capacitor negative terminals | Paired with respective P pins; requires 0.47 µF X7R ceramic capacitors for optimal efficiency. |
| R / G / B | Constant-current LED outputs | Three dedicated current-sink outputs; R supports direct VDD connection for improved efficiency with low-VF LEDs. |
| VOUT | Charge pump regulated output | Supplies boosted voltage (up to 4.55 V at VDD = 3.6 V) to G/B channels and optional R channel. |
| INT | Interrupt / configurable GPO | Open-drain interrupt output (active-low); reconfigurable as push-pull general-purpose output via INT_AS_GPO bit. |
| TRIG | Synchronization I/O | Open-drain trigger line for synchronizing lighting patterns across multiple TPS68402A0RHFR devices. |
| GPO | Dedicated CMOS output | True CMOS-level output (VDD-referenced); no pull-up required; controlled independently via GPO register. |
| ADDR_SEL0 / ADDR_SEL1 | I²C address select inputs | Set 3-bit I²C slave address (0x62–0x65) - enables up to four devices on same bus without address conflict. |
| CLK32K | External clock input | Accepts 16–64 kHz clock; enables precise timing sync and lowest power consumption when internal oscillator is disabled. |
| EN | Chip enable | Active-high enable; pulls device into full shutdown (200 nA) when low - critical for system-level power gating. |
Key Features
| Feature | Design Value |
|---|---|
| Autonomous lighting engine | Three independent 16-instruction state machines execute preloaded lighting sequences without CPU involvement - reduces host MCU wake-ups and system power. |
| Adaptive charge pump | Automatic 1x ↔ 1.5x gain switching based on real-time LED headroom monitoring - maintains efficiency across battery discharge without manual mode selection. |
| Per-channel current control | 8-bit DAC per channel (0–25.5 mA) with ±4% accuracy and <2% matching - ensures consistent RGB color balance under varying thermal conditions. |
| Low-power synchronization | TRIG I/O and shared CLK32K input enable deterministic, low-jitter pattern alignment across multiple devices - essential for seamless multi-LED visual effects. |
| Flexible clock architecture | Supports internal oscillator or external 32.768-kHz crystal; automatic clock detection and fallback ensure robust timing even with marginal external sources. |
Applications
| Keypad Illumination | Function Indication |
|---|---|
Use Scenario: Backlighting of membrane or capacitive keypads in smartphones, medical handhelds, and industrial HMIs. IC Role / Device Role / Timing Role: Constant-current RGB driver with autonomous fade-on/fade-off sequences; uses internal oscillator for timing independence from host. Use Value: Eliminates need for continuous MCU polling; 200-nA shutdown current extends battery life between user interactions. | Use Scenario: Visual status feedback for charging, message receipt, or system alerts in wearables and IoT edge devices. IC Role / Device Role / Timing Role: Independent lighting controller executing timed blink/ramp patterns; triggered via INT or TRIG for coordinated multi-device alerts. Use Value: Enables rich, perceptually uniform (logarithmic PWM) notifications without consuming host CPU cycles or memory. |
| Accent Lighting | Display Backlight |
Use Scenario: Ambient mood lighting in automotive infotainment bezels, smart home remotes, and premium audio controls. IC Role / Device Role / Timing Role: RGB channel driver with synchronized multi-device TRIG operation; uses external 32.768-kHz clock for frame-accurate color transitions. Use Value: Delivers smooth, flicker-free color blending across distributed lighting zones with sub-millisecond inter-device timing alignment. | Use Scenario: Small-format display backlighting in portable diagnostic tools, barcode scanners, and ruggedized tablets. IC Role / Device Role / Timing Role: High-efficiency constant-current driver with R_TO_BATT option - routes red channel directly to battery to minimize voltage drop and heat in high-current white-LED configurations. Use Value: Improves thermal performance and extends runtime by reducing power loss in red channel when VF ≤ VBAT. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multifunction LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS68401C4YFFR | Same core architecture but in NanoFree YFF (4-bump DSBGA) package; lacks TRIG pin and second fly-cap pair; fixed I²C address (0x62). | Targeted at space-constrained designs where board area is critical and multi-device sync is unnecessary. | Select when footprint minimization outweighs synchronization capability and package thermal performance. |
| LP55231RSBT | 3-channel LED driver with integrated 1.5x charge pump, but uses SPI interface; no autonomous program engine; max 20 mA/channel; no R_TO_BATT option. | Designed for simpler static or host-controlled lighting; lacks self-contained sequencing and battery-direct red channel. | Choose for cost-sensitive, non-autonomous applications where I²C is not required and lower current suffices. |
Compared with TPS68401C4YFFR and LP55231RSBT, the TPS68402A0RHFR uniquely combines TRIG-based multi-device sync, dual-fly-cap charge pump flexibility, R_TO_BATT efficiency optimization, and full autonomous instruction execution - making it the only option supporting complex, coordinated, low-power RGB lighting without host intervention.
Availability
TPS68402A0RHFR is available at Aetrix Electronics and suitable for keypad illumination, function indication, accent lighting, and display backlight applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for portable electronics design.
Supply support for TPS68402A0RHFR 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 precision analog IC design and high-volume manufacturing.
The TPS68402A0RHFR belongs to TI's lighting management unit (LMU) product line, engineered specifically for autonomous, low-power RGB LED control in battery-powered portable devices - emphasizing integration, efficiency, and system-level power reduction.
FAQ
What is the primary function of the TPS68402A0RHFR in a portable electronics system?
The TPS68402A0RHFR serves as a multifunction 3-channel LED driver IC that autonomously controls RGB lighting sequences using integrated charge pump, current DACs, and programmable state machines. It eliminates the need for continuous host MCU involvement - enabling features like keypad backlighting, function indication, and accent lighting while minimizing system power consumption. Its design centers on autonomous operation, battery efficiency, and multi-device synchronization.
Does the TPS68402A0RHFR support direct battery connection for the red LED channel?
Yes, the TPS68402A0RHFR supports direct battery connection for the red channel via the R_TO_BATT configuration bit. When enabled, the R output connects to VDD instead of VOUT, bypassing the charge pump for improved efficiency with low-forward-voltage LEDs or higher battery voltages. This feature is exclusive to the red channel and does not affect green or blue channels, which remain tied to VOUT.
How does the TPS68402A0RHFR achieve synchronization across multiple devices?
The TPS68402A0RHFR achieves synchronization using its dedicated TRIG pin and optional external 32.768-kHz clock (CLK32K). The TRIG pin allows open-drain pulse exchange between devices to align lighting pattern start times, while sharing a common CLK32K source ensures identical instruction timing and PWM phase alignment. Both methods are supported simultaneously, enabling robust, low-jitter coordination in multi-LED systems.
What is the significance of the 200-nA shutdown current specification for the TPS68402A0RHFR?
The 200-nA shutdown current enables ultra-low-power retention of lighting functionality in always-on portable devices. When the EN pin is pulled low, the TPS68402A0RHFR enters full shutdown - disabling all analog and digital blocks while maintaining pin-state integrity. This spec allows applications like notification LEDs to remain viable over months of standby time on a single coin cell or small Li-ion battery, directly extending end-product battery life.
Can the TPS68402A0RHFR operate without an external 32.768-kHz crystal?
Yes, the TPS68402A0RHFR operates fully without an external 32.768-kHz crystal. It includes an internal oscillator that serves as the default clock source for PWM and instruction execution. The CLK32K pin may be left unconnected or tied to GND if external timing is not required. External clock use is optional and primarily beneficial for multi-device synchronization and lowest possible power consumption in power-save mode.
TPS68402A0RHFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 5.5V
- Voltage - Output:
- 4.55V
- Current - Output / Channel:
- 150mA
- Frequency:
- 1.25MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-VQFN (5x4)
TPS68402A0RHFR FAQ
1.How can I place an order for TPS68402A0RHFR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS68402A0RHFR 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 TPS68402A0RHFR reliable?
The price and inventory of TPS68402A0RHFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS68402A0RHFR is usually 5 days.
3.What payment methods are accepted for TPS68402A0RHFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS68402A0RHFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS68402A0RHFR?
TPS68402A0RHFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS68402A0RHFR 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 TPS68402A0RHFR?
For technical support, including TPS68402A0RHFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS68402A0RHFR requirements.
6.How does Aetrix verify that TPS68402A0RHFR is sourced from the original manufacturer or authorized distributors?
All TPS68402A0RHFR 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 TPS68402A0RHFR meets industry standards.
7.What is the process for return or replacement of TPS68402A0RHFR?
All TPS68402A0RHFR units undergo pre-shipment inspection (PSI). If there is an issue with TPS68402A0RHFR, 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 TPS68402A0RHFR part is unused and in its original packaging.
Return procedure for TPS68402A0RHFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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