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Texas Instruments TPS61169DCKR
- Part No.:
- TPS61169DCKR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
TPS61169DCKR.pdf
- Description:
- IC LED DRV RGLTR PWM 1.8A SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:9,058
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Product details
Overview
TPS61169DCKR from Texas Instruments is a high-current boost WLED driver IC with integrated 40V/1.8A MOSFET, designed for series-connected white LED backlighting in portable displays. It operates from 2.7V–5.5V input, delivers up to 38V output, regulates LED current via 204mV feedback reference, and supports PWM dimming with no audible noise. Used in smartphones, tablets, and handheld medical devices.
For engineers reviewing the TPS61169DCKR datasheet, TPS61169DCKR pinout, TPS61169DCKR application, or TPS61169DCKR equivalent, key selection criteria include its 1.2MHz fixed-frequency current-mode control, open-LED protection, thermal foldback, soft-start, and SC70-5 package suitability for space-constrained display power designs.
Technical Context
The TPS61169DCKR implements a quasi-constant-frequency current-mode boost topology with internal compensation, enabling stable regulation across wide input (2.7–5.5V) and output (up to 38V) ranges. Its 1.2MHz switching frequency minimizes external component size while maintaining >90% efficiency at typical loads.
Feedback regulation targets 204mV at the FB pin, allowing precise LED current programming via an external RSET resistor. PWM dimming is implemented by modulating the internal reference voltage linearly with duty cycle - not by burst-mode switching - eliminating capacitor-induced acoustic noise.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion and Li-poly battery operation without pre-regulation. |
| Output Voltage Capability | Up to 38V - drives up to 10-series white LEDs (3.8V each) or parallel strings in compact displays. |
| Switch FET Rating | Integrated 40V, 1.8A N-channel MOSFET with 0.35Ω typical RDS(ON) - enables high-efficiency, low-loss power conversion. |
| Current Limit | 1.2A minimum switch current limit - ensures robust overcurrent protection during startup and fault conditions. |
| Switching Frequency | 1.2MHz nominal - allows use of small 4.7µH inductors and ceramic capacitors for minimal board area. |
| Feedback Reference | 204mV ±6% - low-voltage sense reduces I²R loss in RSET, improving accuracy and thermal performance. |
| Efficiency | Up to 90% - achieved under typical 3.6V input, 10-LED string, 20mA load conditions. |
Pinout & Package
TPS61169DCKR is housed in a 5-pin SC70 (DCK) package measuring 2.00mm × 1.25mm, optimized for ultra-compact portable display power solutions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Drain of internal 40V/1.8A MOSFET; connects to inductor and Schottky diode anode - carries high di/dt current pulses. |
| 2 - GND | Power ground | Primary return path for switch current and IC bias; must be low-impedance and thermally coupled to PCB copper pour. |
| 3 - FB | Current-sense feedback | Regulated to 204mV; connects to RSET resistor between FB and GND to set LED current - high-impedance input (2.5µA bias). |
| 4 - CTRL | PWM dimming control | Accepts 5–100kHz PWM signal; logic-high enables operation, duty cycle directly scales FB reference voltage for analog-style dimming. |
| 5 - VIN | Power input | 2.7–5.5V supply input; includes 2.3V UVLO with 200mV hysteresis - requires local 4.7µF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| No-audible-noise PWM dimming | Internal low-pass filtering of CTRL PWM signal modulates reference voltage - avoids LED current pulsing and eliminates capacitor squeal. |
| Open LED protection | Detects SW >37.5V and FB <30mV for ≥3 cycles, then disables switch - prevents output overvoltage damage during LED string disconnection. |
| Built-in soft-start | 6.5ms startup ramp with reduced 0.72A current limit - limits inrush current and stabilizes output voltage rise. |
| Thermal foldback & shutdown | Reduces current limit above 100°C; shuts down at 160°C with 15°C hysteresis - protects reliability in thermally constrained handheld enclosures. |
| Internal compensation | Eliminates external compensation components - simplifies design, improves stability margin, and reduces BOM count. |
Applications
| Smartphone Backlighting | Tablet Display Power |
|---|---|
Use Scenario: Driving 6–10 white LEDs in series for high-brightness front-lit smartphone LCDs powered by single-cell Li-ion batteries. IC Role / Device Role / Timing Role: Primary boost converter and LED current regulator; provides constant-current source with PWM-dimmed brightness control. Use Value: Enables >90% efficiency at 3.6V input and 30–40V output, minimizing battery drain while supporting smooth 1–100% dimming without flicker or noise. | Use Scenario: Powering dual parallel LED strings (e.g., 2×8 LEDs) in 7–10 inch tablet displays requiring higher total current and thermal headroom. IC Role / Device Role / Timing Role: High-current boost controller with thermal foldback - maintains regulated LED current even as junction temperature rises during sustained brightness. Use Value: Integrated 1.8A MOSFET and 1.2A minimum current limit allow direct drive of multi-string configurations without external switches, reducing solution size and cost. |
| Handheld Medical Devices | Thermostat & Appliance Displays |
Use Scenario: Illuminating critical status indicators and LCD segments in blood glucose meters, ECG monitors, and portable diagnostic tools where reliability and low EMI are essential. IC Role / Device Role / Timing Role: Low-noise, safety-focused WLED driver with undervoltage lockout and open-LED fault detection - ensures fail-safe operation during battery depletion or LED failure. Use Value: 204mV reference and internal compensation deliver stable current regulation across temperature and battery voltage sag, meeting medical-grade consistency requirements. | Use Scenario: Providing uniform, dimmable backlighting for segmented or dot-matrix displays in home appliances (refrigerators, ovens) and building automation thermostats operating across wide ambient temperatures. IC Role / Device Role / Timing Role: Robust, thermally adaptive LED driver with shutdown mode (<2µA quiescent current) - extends battery life in backup-powered units and survives industrial temperature extremes. Use Value: Thermal shutdown at 160°C and foldback above 100°C ensure continuous operation in unventilated enclosures, while 2.7V UVLO prevents erratic behavior near end-of-life battery voltage. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar WLED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS61165DCKR | Lower 28V output capability; same 1.2MHz frequency and SC70-5 package; lacks open-LED protection. | Suitable only for ≤8-series LED strings; requires external fault handling for open-circuit conditions. | Select when output voltage ≤28V suffices and open-LED protection is managed externally or unnecessary. |
| RT9397BZSP | 36V max output; 1.3MHz switching; external compensation required; no integrated thermal foldback. | Needs additional RC network for loop stability; less autonomous thermal management in high-power density layouts. | Choose if board space allows extra compensation components and thermal monitoring is handled system-level. |
Compared with TPS61165DCKR and RT9397BZSP, the TPS61169DCKR offers superior 38V output headroom, built-in open-LED protection, and autonomous thermal foldback - making it the preferred choice for compact, high-reliability, single-chip LED backlighting in battery-powered portable electronics.
Availability
TPS61169DCKR is available at Aetrix Electronics and suitable for smartphone backlighting, tablet display power, and handheld medical device illumination requiring stable component supply and long-term production continuity.
Supply support for TPS61169DCKR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.
The TPS61169DCKR belongs to TI's high-efficiency LED backlight driver product line, engineered specifically for space-constrained, battery-operated portable displays requiring high output voltage, low noise, and robust fault protection.
FAQ
What is the maximum LED string voltage supported by the TPS61169DCKR?
The TPS61169DCKR supports up to 38V output voltage, enabling driving of white LED strings with combined forward voltage up to that level - for example, 10×3.8V LEDs in series. This is enforced by internal open-LED protection that triggers at 37.5V typical, preventing damage during fault conditions. The integrated 40V MOSFET provides necessary voltage margin.
How does PWM dimming work on the TPS61169DCKR without causing audible noise?
The TPS61169DCKR avoids audible noise by using PWM input on the CTRL pin to modulate the internal 204mV reference voltage - not by toggling the LED current on/off. An internal low-pass filter converts the PWM signal into a DC-equivalent reference, resulting in true analog-style current regulation. This eliminates high-frequency current ripple in the output capacitor that causes piezoelectric squeal in ceramic caps.
What is the purpose of the 204mV feedback reference voltage in the TPS61169DCKR?
The 204mV feedback reference voltage in the TPS61169DCKR sets the voltage across the external RSET resistor to determine LED current (ILED = 204mV / RSET). Its low value minimizes power dissipation and self-heating in RSET, improving current accuracy and thermal stability - especially critical in compact, sealed handheld enclosures where heat buildup affects LED color and lifetime.
Does the TPS61169DCKR require external compensation components?
No, the TPS61169DCKR features internal compensation, eliminating the need for external RC networks on the COMP or FB pins. This simplifies layout, reduces BOM count and cost, and ensures consistent loop stability across manufacturing variance and temperature - a key advantage for high-volume portable display designs where design validation time is critical.
What protection features are integrated into the TPS61169DCKR?
The TPS61169DCKR integrates six protection functions: (1) open-LED detection (shuts down if SW >37.5V and FB <30mV), (2) undervoltage lockout (2.3V enable threshold), (3) thermal shutdown (160°C trip with 15°C hysteresis), (4) thermal foldback (reduces current limit above 100°C), (5) soft-start (6.5ms ramp with 0.72A limit), and (6) overvoltage protection (37.5V output clamp). These ensure robust operation in unattended portable systems.
TPS61169DCKR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 1.8A (Switch)
- Frequency:
- 1.2MHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SC-70-5
TPS61169DCKR FAQ
1.How can I place an order for TPS61169DCKR through Aetrix?
Please submit a Request for Quotation (RFQ) for TPS61169DCKR 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 TPS61169DCKR reliable?
The price and inventory of TPS61169DCKR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TPS61169DCKR is usually 5 days.
3.What payment methods are accepted for TPS61169DCKR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TPS61169DCKR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TPS61169DCKR?
TPS61169DCKR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TPS61169DCKR 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 TPS61169DCKR?
For technical support, including TPS61169DCKR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TPS61169DCKR requirements.
6.How does Aetrix verify that TPS61169DCKR is sourced from the original manufacturer or authorized distributors?
All TPS61169DCKR 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 TPS61169DCKR meets industry standards.
7.What is the process for return or replacement of TPS61169DCKR?
All TPS61169DCKR units undergo pre-shipment inspection (PSI). If there is an issue with TPS61169DCKR, 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 TPS61169DCKR part is unused and in its original packaging.
Return procedure for TPS61169DCKR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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