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Texas Instruments TPS75100DSKR
- Part No.:
- TPS75100DSKR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
TPS75100DSKR.pdf
- Description:
- IC LED DRVR LIN PWM 25MA 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:11,528
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Product details
Overview
TPS75100DSKR from Texas Instruments is a low-dropout linear LED current driver optimized for keypad and navigation pad backlighting in Li-ion–powered portable devices. It delivers matched constant current (±2% LED-to-LED) to four LEDs across two independent banks (D1A/D2A and D1B/D2B), supports PWM brightness control per bank, features 28 mV typical dropout at 5 mA, and operates from 2.7 V to 5.5 V input.
For engineers reviewing the TPS75100DSKR datasheet, TPS75100DSKR pinout, TPS75100DSKR application, or TPS75100DSKR equivalent, this page provides verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and supply support details specific to the DSK (WSON-10) package variant.
Technical Context
The TPS75100DSKR implements four matched NMOS-based linear current sources with shared internal 1.225 V reference and 420:1 current mirroring ratio. Each bank (A/B) uses dedicated enable pins (ENA/ENB) for independent PWM dimming control, with no internal switching circuitry-eliminating EMI generation. Current matching is performed concurrently across all four channels, not per-bank.
It operates in common-cathode LED topology with output voltage compliance up to VIN – 28 mV (at 5 mA). Minimum output voltage requirement is ~1.5 V for optimal accuracy, making it suitable for white and color LEDs (e.g., red at 1.7 V), but not sub-1.5 V IR or specialty diodes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current per LED | Up to 25 mA - supports standard backlight LEDs without external current-setting resistors when factory-programmed (3–10 mA options). |
| LED-to-LED matching | ±2% typ (25°C), ±6% max (–40°C to +85°C) - ensures uniform brightness across 4-LED arrays without binning. |
| Dropout voltage | 28 mV typ at 5 mA - extends usable battery life down to ~2.8 V in single-cell Li-ion systems before current regulation degrades. |
| PWM minimum on-time | 33 µs - defines lowest practical dimming frequency (~30 kHz at 10% duty cycle); shorter pulses cause current undershoot. |
| ISET reference voltage | 1.225 V nominal - enables precise external current setting via RSET = (1.225 V / ILED) × 420; e.g., 51.1 kΩ sets 10 mA. |
| Supply voltage range | 2.7 V to 5.5 V - fully covers discharged-to-fully-charged Li-ion (2.8 V–4.2 V) plus margin for system rail tolerance. |
| Thermal shutdown | 165°C activation / 140°C reset - protects against sustained overloads in compact WSON-10 layout without heatsinking. |
Pinout & Package
TPS75100DSKR is packaged in a 2.50-mm × 2.50-mm, 10-pin WSON (DSK) thermally enhanced exposed-pad package. The exposed thermal pad (Pin 5) must be soldered to PCB ground plane for rated power dissipation and thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 9) | Power input | Accepts 2.7–5.5 V supply; requires local 1-µF ceramic decoupling near pin for stability. |
| GND (Pins 5, Pad) | Ground reference | Primary return path; exposed thermal pad must be connected to solid ground plane for RθJB = 39.5°C/W. |
| ENA (Pin 2) | Bank A enable | Active-high logic input; PWM signal here controls brightness of D1A/D2A simultaneously; VIH ≥ 1.2 V, VIL ≤ 0.4 V. |
| ENB (Pin 1) | Bank B enable | Independent active-high control for D1B/D2B; allows dual-zone dimming (e.g., keypad vs. display). |
| D1A (Pin 3), D2A (Pin 4) | Current source outputs, Bank A | Source current to LED anodes; each drives up to 25 mA; connect cathodes to common ground or controller. |
| D1B (Pin 8), D2B (Pin 7) | Current source outputs, Bank B | Identical function to D1A/D2A; electrically isolated from Bank A except for shared current matching reference. |
| ISET (Pin 10) | Current programming | Connect resistor to GND to set LED current; open-circuit selects factory preset (e.g., 5 mA ±0.5%); detects RSET via >3 µA current draw. |
| NC (Pin 6) | No connect | Not internally bonded; leave unconnected or float - no routing or grounding required. |
Key Features
| Feature | Design Value |
|---|---|
| No internal switching signals | Eliminates EMI-sensitive clock generators or charge pumps - simplifies EMC testing in RF-dense handsets. |
| Factory-programmable default current | Eight preset levels (3–10 mA in 1-mA steps) with ±0.5% accuracy - removes RSET resistor, saving BOM cost and board space. |
| Independent bank enable & PWM control | ENA/ENB allow separate brightness zones (e.g., keypad backlight dimmed while display remains full-bright) without additional drivers. |
| Ultra-low dropout (28 mV) | Maintains regulation down to VIN – 0.028 V - maximizes runtime in Li-ion applications where voltage drops below 3.0 V during discharge. |
| Overcurrent and overtemperature protection | Auto-shutdown at 35 mA per channel or 165°C junction - prevents damage during LED short or thermal overload in sealed enclosures. |
Applications
| Keypad Backlighting | Navigation Pad Illumination |
|---|---|
Use Scenario: Illuminating mechanical or capacitive keypad buttons in cellular handsets under varying ambient light. IC Role / Device Role / Timing Role: Constant-current source driving two parallel white LEDs per bank (D1A/D2A for keys, D1B/D2B for function labels), controlled by baseband processor GPIO PWM. Use Value: Delivers uniform brightness across all keys without current drift as battery discharges from 4.2 V to 2.8 V, thanks to 28 mV dropout and tight line regulation (2.0%/V). | Use Scenario: Providing adjustable backlight for 4-way navigation pads or touch-sensitive directional controls in smartphones and PDAs. IC Role / Device Role / Timing Role: Dual-bank LED driver enabling independent dimming of vertical (D1A/D2A) and horizontal (D1B/D2B) indicators using separate PWM signals from application MCU. Use Value: Enables context-aware UI feedback (e.g., dim vertical arrows while highlighting horizontal selection) with zero added EMI due to linear architecture. |
| Display Sub-Backlight | Multi-Color Status Indicators |
Use Scenario: Driving edge-lit or direct-lit auxiliary displays (e.g., secondary OLED or segment LCD) requiring precise, low-noise current control. IC Role / Device Role / Timing Role: Low-noise LDO-based current source replacing switching boost+constant-current ICs in noise-sensitive analog front-end sections. Use Value: Avoids conducted/radiated noise coupling into adjacent RF receivers or audio codecs - critical for carrier-grade certification. | Use Scenario: Powering RGB status LEDs (red/green/blue) where color balance depends on exact per-channel current matching. IC Role / Device Role / Timing Role: Four-channel matched current source with <±2% matching across all outputs, supporting mixed-color LED strings in common-cathode configuration. Use Value: Maintains consistent hue and saturation across temperature (–40°C to +85°C) without calibration, leveraging concurrent 4-channel matching architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED current source applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS75103DSKR | Factory-programmed for 3 mA per LED (vs. TPS75100DSKR's 0 mA default - i.e., requires external RSET or open ISET for user-defined current) | Fixed low-current mode ideal for ultra-low-power standby indicators; not user-adjustable without resistor | Select when fixed 3 mA operation suffices and BOM simplicity outweighs programmability |
| TPS75105DSKR | Factory-programmed for 5 mA per LED (±0.5%); identical pinout, specs, and package | Drop-in replacement for designs needing calibrated 5 mA without external components or layout changes | Choose for production-ready 5 mA backlighting where factory-trimmed accuracy eliminates RSET tolerance risk |
Compared with TPS75100DSKR, TPS75103DSKR offers guaranteed low-power operation but sacrifices flexibility, while TPS75105DSKR provides immediate 5 mA accuracy without design iteration - both share identical thermal, PWM, and matching performance, making them true functional alternatives within the same family.
Availability
TPS75100DSKR is available at Aetrix Electronics and suitable for keypad backlighting, navigation pad illumination, and multi-color status indicator applications requiring stable component supply, long-term lifecycle support, and traceable sourcing for consumer electronics OEMs.
Supply support for TPS75100DSKR 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 company specializing in analog, embedded processing, and digital signal solutions for industrial, automotive, and personal electronics markets.
The TPS7510x product line was designed specifically for low-noise, high-matching LED current sourcing in space-constrained mobile handsets - prioritizing EMI-free operation, Li-ion compatibility, and factory-trimmable precision over switching efficiency.
FAQ
What is the default LED current behavior of the TPS75100DSKR when the ISET pin is left open?
The TPS75100DSKR has no factory-programmed default current - unlike TPS75103DSKR (3 mA) or TPS75105DSKR (5 mA), the TPS75100DSKR requires an external resistor connected from ISET to GND to set output current. When ISET is open, the device draws <3 µA and defaults to undefined/unspecified current; it will not regulate correctly without RSET.
Can the TPS75100DSKR drive LEDs with forward voltages below 1.5 V?
No. The TPS75100DSKR uses NMOS-based current sources requiring a minimum output voltage of ~1.5 V for accurate regulation. Driving LEDs with VF < 1.5 V (e.g., some IR or Schottky diodes) results in degraded current accuracy and potential dropout violation - it is validated only for white and color LEDs (≥1.5 V, e.g., red at 1.7 V).
Does the TPS75100DSKR require output capacitors for stability?
No. The TPS75100DSKR is internally compensated and does not require external output capacitors. Adding them is not recommended, as they can interact with the current-source output impedance and degrade transient response or cause oscillation. Only standard 1-µF ceramic input decoupling is needed at VIN.
How does PWM dimming work on the TPS75100DSKR enable pins?
PWM dimming on the TPS75100DSKR is implemented by applying a logic-level square wave to ENA or ENB. The LED current scales linearly with duty cycle (0–100%) because the internal current source turns fully on/off synchronously with the enable signal. Minimum on-time is 33 µs; shorter pulses cause incomplete current ramp-up and reduced effective brightness.
Is the TPS75100DSKR pin-compatible with other TPS7510x variants like TPS75105DSKR?
Yes. All TPS7510x variants including TPS75100DSKR, TPS75103DSKR, and TPS75105DSKR share identical WSON-10 (DSK) pinout, package dimensions (2.50 mm × 2.50 mm), thermal pad layout, and electrical interface - enabling drop-in substitution where current requirements align with factory presets or external RSET configuration.
TPS75100DSKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 4
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 25mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SON (2.5x2.5)
TPS75100DSKR FAQ
1.How can I place an order for TPS75100DSKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS75100DSKR 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 TPS75100DSKR reliable?
The price and inventory of TPS75100DSKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS75100DSKR is usually 5 days.
3.What payment methods are accepted for TPS75100DSKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS75100DSKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS75100DSKR?
TPS75100DSKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS75100DSKR 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 TPS75100DSKR?
For technical support, including TPS75100DSKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS75100DSKR requirements.
6.How does Aetrix verify that TPS75100DSKR is sourced from the original manufacturer or authorized distributors?
All TPS75100DSKR 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 TPS75100DSKR meets industry standards.
7.What is the process for return or replacement of TPS75100DSKR?
All TPS75100DSKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS75100DSKR, 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 TPS75100DSKR part is unused and in its original packaging.
Return procedure for TPS75100DSKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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