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Texas Instruments LM27965SQ/NOPB
- Part No.:
- LM27965SQ/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM27965SQ/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 30MA 24WQFN
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM27965SQ/NOPB from Texas Instruments is a dual-display white LED driver IC with I²C-compatible brightness control, adaptive 1×/3/2× charge pump, 180mA total regulated output current, 0.3% LED current matching, and operation from 2.7V to 5.5V input - used for main/sub display backlighting in mobile phones and PDAs.
For engineers reviewing the LM27965SQ/NOPB datasheet, LM27965SQ/NOPB pinout, LM27965SQ/NOPB application, or LM27965SQ/NOPB equivalent, this page delivers verified specifications, validated WQFN-24 package mapping, confirmed I²C address (0x36), real-world current regulation behavior across BankA/B/C, and precise thermal and efficiency trade-offs under varying VIN and VLED conditions.
Technical Context
The LM27965SQ/NOPB integrates three independently controlled constant-current sink banks: BankA (5 pins: D1A–D5A) for main display, BankB (3 pins: D1B–D3B) for sub-display, and BankC (1 pin: D1C) for indicator LED. Each bank uses resistor-programmed full-scale current via ISET (1.25V reference) and supports analog + PWM dimming - 32 levels for Banks A/B, 4 analog levels for BankC.
Its adaptive charge pump dynamically selects 1× (pass-through) or 3/2× gain based on forward voltage monitoring of active Dxx pins; transition occurs at ~175mV headroom threshold to maintain regulation while maximizing efficiency. Internal thermal shutdown engages at TJ ≈ 170°C, and junction-to-ambient thermal resistance is 41.3°C/W in the RTW0024A WQFN-24 package.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports single-cell Li-ion battery operation without external LDO. |
| Total Output Current | 180mA max - distributed across up to 9 LEDs (5+3+1), with per-pin limit of 30mA. |
| Current Matching | 0.3% typical - ensures uniform brightness across all LEDs in same bank under identical conditions. |
| I²C Address | 0x36 (7-bit) - fixed for LM27965SQ/NOPB; enables multi-device bus configuration without conflict. |
| Charge Pump Gain | Adaptive 1× or 3/2× - automatically switches to maintain ≥110mV headroom across current sinks. |
| Switching Frequency | 1.27 MHz typical - minimizes EMI and allows use of small 1µF ceramic flying capacitors (C1/C2). |
| Quiescent Current | 3.32 mA typical (gain=1.5×, no load) - balances low-power standby with fast wake-up response. |
Pinout & Package
LM27965SQ/NOPB is housed in a 4mm × 4mm × 0.8mm WQFN-24 package (TI package code RTW0024A) with exposed thermal pad (DAP) connected to GND for enhanced thermal performance. Pin numbering follows standard top-view layout with pin 1 at top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (24) | Main power input | Accepts 2.7–5.5V supply; powers charge pump and internal circuitry - requires local 1µF CIN decoupling. |
| POUT (23) | Charge pump regulated output | Delivers boosted voltage (up to ~1.5×VIN) to LED anodes; connects to COUT capacitor and LED common-anode nodes. |
| C1 (19,22), C2 (20,21) | Flying capacitor connections | Two independent 1µF ceramic caps enable 3/2× charge pump operation; placement critical for efficiency and noise. |
| D1A–D5A (12–16) | BankA LED current sinks | Five individually sourced constant-current outputs for main display LEDs; each supports ≤30mA. |
| D1B–D3B (4–6) | BankB LED current sinks | Three constant-current outputs for sub-display LEDs; forward-voltage sensing enables adaptive gain control. |
| D1C (3) | Indicator LED sink | Single current sink for status/indicator LED; no forward-voltage sensing - operates in fixed-gain mode. |
| ISET (17) | Current reference programming | Connects to GND via RSET resistor; sets full-scale current as IDxx = 200 × (1.25V / RSET). |
| SCL (1), SDIO (2) | I²C interface signals | Standard bidirectional I²C bus lines referenced to VIO; support 100kHz/400kHz modes with 3.3V or 1.8V logic levels. |
| VIO (7) | I²C logic level reference | Sets voltage threshold for SCL/SDIO inputs; must match host controller's I/O voltage (1.4V to VIN). |
| RESET (10) | Hardware reset input | Active-low asynchronous reset - drives low to clear registers and disable all banks immediately. |
| GND (9,18,DAP) | Ground reference | Three dedicated ground pins plus exposed DAP ensure low-impedance return path and thermal dissipation. |
| NC (8,11) | No-connect | Unbonded pins - must be left floating or tied to GND per PCB layout best practices. |
Key Features
| Feature | Design Value |
|---|---|
| Inductorless architecture | Eliminates magnetic components and associated EMI; enables ultra-compact 25mm² total solution size. |
| 91% peak LED drive efficiency | Achieved via adaptive gain selection and low-RDS(on) internal switches - reduces thermal load in space-constrained handsets. |
| Independent bank control | Enables simultaneous but distinct brightness tuning for main display (BankA), sub-display (BankB), and indicator (BankC). |
| Resistor-programmable current | Full-scale current set by single external RSET (e.g., 12.7kΩ → 20mA per Dxx pin); simplifies BOM and calibration. |
| Thermal protection | Internal shutdown at TJ ≈ 170°C with hysteresis (re-enable at ~165°C) - prevents permanent damage during overload or poor heatsinking. |
Applications
| Mobile Phone Main Display Backlight | PDA Sub-Display Lighting |
|---|---|
|
Use Scenario: Driving 5 white LEDs (3.6V VF, 20mA each) for high-resolution main LCD backlight in compact smartphone form factor. IC Role / Device Role / Timing Role: Constant-current sink bank (BankA) with adaptive charge pump gain and I²C brightness control. Use Value: Delivers uniform brightness and >91% efficiency across 2.7–5.5V battery range without inductor - extends runtime and reduces board area. |
Use Scenario: Powering 2–3 smaller white LEDs for secondary display (e.g., status panel or flip-phone sub-screen) with independent dimming. IC Role / Device Role / Timing Role: Dedicated current sink bank (BankB) with forward-voltage sensing and 32-level PWM dimming. Use Value: Enables synchronized or differentiated brightness vs. main display using same I²C bus - eliminates need for second LED driver IC. |
| Indicator LED Driver | Compact Handheld Device Lighting |
|
Use Scenario: Driving single status LED (e.g., power-on or notification indicator) with stable current and 4-step analog dimming. IC Role / Device Role / Timing Role: Independent current sink (BankC/D1C) with fixed-gain operation and no VF sensing. Use Value: Provides reliable, low-noise indicator lighting without consuming BankA/B resources or requiring separate driver. |
Use Scenario: Integrated backlight solution for handheld medical or industrial devices requiring dual-zone lighting and long battery life. IC Role / Device Role / Timing Role: Single-chip triple-bank LED driver with hardware RESET, thermal protection, and I²C register access. Use Value: Reduces component count, simplifies firmware (one I²C address), and ensures consistent LED aging behavior across zones. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-display LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27964SQ/NOPB | Same WQFN-24 package and pinout; supports only two LED banks (no D1C indicator sink); I²C address 0x34. | Lacks independent indicator LED control - unsuitable where status lighting must operate separately from displays. | Select when only main + sub-display are needed and board space or cost optimization is prioritized over indicator flexibility. |
| TPS61165DRVR | Boost-based (inductor required); 40V output capability; single-bank 30mA max; no built-in VF sensing or multi-bank dimming. | Requires external inductor and discrete current-setting; supports higher-VF LEDs but lacks BankA/B/C independence. | Choose for designs needing >4V LED strings or where inductor use is acceptable and multi-bank control is unnecessary. |
Compared with LM27965SQ/NOPB, LM27964SQ/NOPB removes BankC functionality while retaining identical efficiency and matching specs, whereas TPS61165DRVR trades charge-pump simplicity for higher output voltage at the cost of board area and design complexity.
Availability
LM27965SQ/NOPB is available at Aetrix Electronics and suitable for mobile phone backlighting, PDA display systems, and compact handheld device lighting requiring stable component supply, long-lifecycle support, and guaranteed RoHS-compliant sourcing.
Supply support for LM27965SQ/NOPB 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 experience in portable power and display solutions.
The LM27965SQ/NOPB belongs to TI's white LED driver product line, engineered specifically for space-constrained, battery-powered dual-display applications demanding high efficiency, precise current matching, and seamless I²C integration.
FAQ
What is the I²C address of the LM27965SQ/NOPB?
The LM27965SQ/NOPB uses a fixed 7-bit I²C slave address of 0x36 (binary 0110110). This differs from the LM27965SQ-M variant, which uses 0x38. The address is hardwired and cannot be changed via pins or registers - ensuring predictable bus allocation in multi-device systems where LM27965SQ/NOPB is deployed alongside other TI LED drivers.
How is full-scale LED current set on the LM27965SQ/NOPB?
Full-scale LED current for all banks (D1A–D5A, D1B–D3B, D1C) is set by connecting an external resistor RSET between the ISET pin (Pin 17) and GND. The LM27965SQ/NOPB regulates ISET at 1.25V, so IDxx = 200 × (1.25V / RSET). For example, a 12.7kΩ RSET yields ~20mA per sink. This scaling applies identically across all three banks, enabling consistent current programming with one component.
Does the LM27965SQ/NOPB require inductors?
No, the LM27965SQ/NOPB uses an inductorless charge-pump architecture with integrated flying capacitors (C1, C2). It operates in adaptive 1× or 3/2× gain modes to regulate POUT without magnetic components - reducing EMI, board area, and bill-of-materials cost. Only four external 1µF ceramic capacitors (CIN, COUT, C1, C2) are required for full operation.
What thermal protection does the LM27965SQ/NOPB include?
The LM27965SQ/NOPB features internal thermal shutdown that activates at approximately 170°C junction temperature and releases at ~165°C. This hysteresis prevents oscillation during thermal stress. With a θJA of 41.3°C/W in its WQFN-24 package, the device can dissipate up to ~550mW before shutdown under typical PCB conditions - sufficient for 180mA total output at moderate ambient temperatures.
Can unused LED driver pins on the LM27965SQ/NOPB be left floating?
No - unused DxA (D1A–D4A) or DxB (D1B–D2B) pins must not be left floating, as their forward-voltage sensing circuitry will force the charge pump into 3/2× mode across the entire input range, degrading efficiency. Unused pins should be connected to GND or tied to POUT (common-anode node) to disable sensing. D1C and NC pins may be left unconnected.
LM27965SQ/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-WFQFN 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:
- 9
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 2V ~ 4V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.27MHz
- Dimming:
- I2C
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x4)
LM27965SQ/NOPB FAQ
1.How can I place an order for LM27965SQ/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27965SQ/NOPB 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 LM27965SQ/NOPB reliable?
The price and inventory of LM27965SQ/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27965SQ/NOPB is usually 5 days.
3.What payment methods are accepted for LM27965SQ/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27965SQ/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27965SQ/NOPB?
LM27965SQ/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27965SQ/NOPB 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 LM27965SQ/NOPB?
For technical support, including LM27965SQ/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27965SQ/NOPB requirements.
6.How does Aetrix verify that LM27965SQ/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27965SQ/NOPB 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 LM27965SQ/NOPB meets industry standards.
7.What is the process for return or replacement of LM27965SQ/NOPB?
All LM27965SQ/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27965SQ/NOPB, 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 LM27965SQ/NOPB part is unused and in its original packaging.
Return procedure for LM27965SQ/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM27965SQ/NOPB Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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