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Texas Instruments LM27965SQ-M/NOPB
- Part No.:
- LM27965SQ-M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM27965SQ-M/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 30MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,930
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Product details
Overview
LM27965SQ-M/NOPB from Texas Instruments is a dual-display white LED driver IC with I²C-compatible brightness control, adaptive 1×/3/2× charge pump, and three independently controlled current-sink banks (BankA: up to 5 LEDs, BankB: up to 3 LEDs, BankC: 1 indicator LED). It delivers up to 180mA total output current, achieves 91% peak efficiency, and supports 2.7V–5.5V input for mobile phone and PDA display lighting.
For engineers reviewing the LM27965SQ-M/NOPB datasheet, LM27965SQ-M/NOPB pinout, LM27965SQ-M/NOPB application, or LM27965SQ-M/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed I²C address (0x38), exact current-matching specs (0.3% typ.), and real-world design meaning of headroom voltage, gain transition, and PWM-analog hybrid dimming.
Technical Context
The LM27965SQ-M/NOPB implements an adaptive CMOS charge pump that dynamically switches between 1× pass-through and 3/2× boost modes based on real-time forward-voltage monitoring of active DxA/DxB pins - triggering at 175mV headroom threshold to maintain regulation. Its internal current sinks use precision 1.25V reference and 200× scaling from ISET to deliver tightly matched LED current across banks.
It integrates three independent brightness control domains: BankA and BankB support 32-step I²C-programmable dimming via combined analog scaling and 20kHz PWM; BankC offers 4-level analog-only control. The device uses dedicated VIO pin for I²C logic level translation and includes hardware RESET pin with 0.45V threshold for system-level fault recovery.
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 - distributable across BankA (≤125mA), BankB (≤45mA), BankC (≤30mA) with per-pin limit of 30mA. |
| LED Current Matching | 0.3% typical - ensures uniform brightness across all LEDs in same bank under varying VIN and temperature. |
| I²C Address | 0x38 (hex) - fixed slave address for LM27965SQ-M variant; enables multi-device bus configuration without address conflict. |
| Charge Pump Gain Modes | Adaptive 1× or 3/2× - automatically selects mode based on VDxx headroom to maximize efficiency across input/LED voltage combinations. |
| Current Setting Accuracy | ±9.5% (BankA/B), ±7.7% (BankC) - guaranteed over full operating temperature range (-30°C to +100°C junction). |
| Startup Time | 250µs - time for POUT to reach 90% steady-state voltage; critical for fast-display wake-up sequences. |
Pinout & Package
LM27965SQ-M/NOPB is housed in a 24-pin WQFN package (4mm × 4mm × 0.8mm, RTW0024A), thermally enhanced with exposed DAP connected to GND for PCB heat dissipation. Pin pitch is 0.5mm; RoHS-compliant and lead-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (24) | Main power input | Accepts 2.7V–5.5V supply; powers charge pump and internal circuitry; requires local 1µF ceramic decoupling. |
| POUT (23) | Charge pump regulated output | Delivers boosted voltage to LED anodes; voltage tracks VIN in 1× mode or = 1.5×VIN in 3/2× mode minus ROUT drop. |
| C1 (19,22), C2 (20,21) | Flying capacitor connections | Interface with internal charge pump switches; requires two 1µF low-ESR MLCCs (e.g., TDK C1608X5R1A105K). |
| D1A–D5A (12–16) | BankA LED cathode drivers | Five independent current sinks for main display; each sinks up to 30mA; forward-voltage sensing enabled by default. |
| D1B–D3B (4–6) | BankB LED cathode drivers | Three independent current sinks for sub-display; each sinks up to 30mA; forward-voltage sensing enabled by default. |
| D1C (3) | Indicator LED driver | Single current sink for status LED; no forward-voltage sensing; supports 4-level analog dimming only. |
| ISET (17) | Current reference programming | Connects to GND via RSET resistor; sets full-scale current as IDxx = 200 × (1.25V / RSET); tolerance directly impacts LED brightness accuracy. |
| SCL (1), SDIO (2) | I²C serial interface | Standard bidirectional I²C bus signals; referenced to VIO; require pull-up resistors to VIO; support 100kHz–400kHz operation. |
| VIO (7) | I²C logic voltage reference | Sets logic threshold for SCL/SDIO; compatible with 1.4V–VIN range; enables interfacing with 1.8V or 3.3V microcontrollers. |
| RESET (10) | Hardware reset input | Active-low asynchronous reset; pulls all registers to power-on defaults when driven ≤0.45V; must be pulled high for normal operation. |
| GND (9,18,DAP) | Ground reference | Three dedicated GND pins plus thermal pad (DAP); all must be connected to solid ground plane for stable regulation and thermal performance. |
| NC (8,11) | No-connect | Internally unconnected; must remain floating or tied to GND per layout guidelines; no electrical function. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive 1×/3/2× charge pump | Eliminates inductor requirement while maintaining >91% efficiency across 2.7V–5.5V input and 2.0V–4.0V LED Vf range. |
| Three independent LED banks | Enables simultaneous control of main display (BankA), sub-display (BankB), and indicator (BankC) with separate dimming profiles. |
| 0.3% typical current matching | Guarantees consistent luminance across all LEDs in same bank - essential for artifact-free display backlighting. |
| I²C-compatible interface with dual addresses | Supports coexistence of LM27965 (0x36) and LM27965SQ-M/NOPB (0x38) on same bus for multi-display systems. |
| Hardware RESET pin with defined threshold | Provides deterministic power-cycle recovery without firmware dependency; resets all brightness registers and enables to default state. |
Applications
| Mobile Phone Main/Sub Display | PDA Backlight System |
|---|---|
|
Use Scenario: Dual-panel smartphone with high-resolution AMOLED main screen and smaller OLED status bar. IC Role / Device Role / Timing Role: LM27965SQ-M/NOPB drives 5 LEDs in BankA for main display and 3 LEDs in BankB for sub-display, using independent I²C registers for synchronized but distinct brightness curves. Use Value: Achieves uniform luminance across both panels with <0.3% current mismatch, while adaptive gain maintains >88% efficiency at 3.3V input and 3.4V LED Vf. |
Use Scenario: Handheld PDA requiring long battery life and reliable backlight during intermittent use. IC Role / Device Role / Timing Role: LM27965SQ-M/NOPB supplies regulated current to 4 main-display LEDs (BankA) and 2 auxiliary LEDs (BankB), with BankC driving power-status LED. Use Value: 25mm² total solution size and no-inductor design reduce BOM cost and PCB area; shutdown current of 5.4µA extends standby time. |
| Industrial HMI Indicator Lighting | Portable Medical Device Display |
|
Use Scenario: Ruggedized human-machine interface panel with status indicators and segmented LCD backlight. IC Role / Device Role / Timing Role: LM27965SQ-M/NOPB uses BankC (D1C) for red/green status LED and BankB (D1B–D2B) for LCD edge-lit backlight, all controlled via single I²C bus. Use Value: Hardware RESET pin enables fail-safe recovery during ESD events; extended -30°C to +85°C ambient rating ensures operation in harsh environments. |
Use Scenario: Battery-powered ultrasound or glucose monitor with clinical-grade display brightness consistency. IC Role / Device Role / Timing Role: LM27965SQ-M/NOPB drives 5 main-display LEDs (BankA) with 32-step PWM dimming and 1 indicator LED (BankC) for alarm signaling. Use Value: 20kHz PWM frequency avoids audible noise; 0.3% current matching prevents visible banding in grayscale medical images. |
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 pinout and package; I²C address 0x36; lacks BankC indicator driver; BankA/B only; 16-level dimming vs. 32-level. | Not suitable for designs requiring independent indicator LED control; limited brightness resolution reduces fine-tuning capability. | Select LM27964SQ/NOPB only if BankC functionality is unused and lower-cost sourcing is prioritized over dimming granularity. |
| TPS61165DRVR | Boost-based (inductor required); single-bank 30mA output; no I²C interface; analog dimming only; no voltage-sensing gain adaptation. | Cannot drive dual displays independently; no hardware RESET; requires external PWM generator for dimming; larger solution size. | Choose TPS61165DRVR only for cost-sensitive single-LED applications where inductor use is acceptable and I²C control is unnecessary. |
Compared with LM27964SQ/NOPB and TPS61165DRVR, LM27965SQ-M/NOPB uniquely combines triple-bank architecture, adaptive charge-pump efficiency, and I²C-address differentiation - enabling compact, low-noise, multi-zone lighting control without layout or firmware redesign.
Availability
LM27965SQ-M/NOPB is available at Aetrix Electronics and suitable for mobile phone display lighting, PDA backlighting, and industrial HMI indicator applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM27965SQ-M/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 expertise in precision LED drivers and portable power solutions.
The LM27965SQ-M/NOPB belongs to TI's white LED driver product line, engineered specifically for space-constrained dual-display devices requiring high-efficiency, no-inductor backlighting with precise current matching and flexible I²C control.
FAQ
What is the I²C slave address for LM27965SQ-M/NOPB?
The LM27965SQ-M/NOPB uses a fixed 7-bit I²C slave address of 0x38 (hex), which corresponds to binary 0111000. This distinguishes it from the standard LM27965 (0x36), allowing both variants to coexist on the same I²C bus without address conflict. The address is hardwired and not software-configurable. All register writes and reads for LM27965SQ-M/NOPB must target 0x38 to ensure proper communication and brightness control.
How does the LM27965SQ-M/NOPB achieve 91% peak efficiency without an inductor?
The LM27965SQ-M/NOPB achieves 91% peak efficiency using an adaptive CMOS charge pump that operates in either 1× pass-through or 3/2× boost mode. When input voltage is sufficient to forward-bias all LEDs, it runs in 1× mode with minimal conduction loss. When VIN drops, it switches to 3/2× mode only as needed - avoiding continuous boost conversion losses. This gain selection, combined with low-RDS(on) internal switches and optimized flying capacitors, eliminates inductor requirements while preserving high efficiency across the 2.7V–5.5V input range.
Can LM27965SQ-M/NOPB drive more than one LED per current sink pin?
Yes - LM27965SQ-M/NOPB supports parallel connection of its DxA or DxB outputs (e.g., D1A–D5A) to drive a single high-current LED. In such configurations, RSET must be selected so that each sink delivers 20% of the desired total current (e.g., 12mA per sink for 60mA total). BankC (D1C) is not designed for parallel use. All Electrical Characteristics - including maximum per-pin current (30mA), headroom voltage, and matching - remain valid in parallel mode, and no internal changes or register settings are required.
What is the role of the VIO pin on LM27965SQ-M/NOPB?
The VIO pin on LM27965SQ-M/NOPB sets the logic reference voltage for the SCL and SDIO I²C interface, supporting 1.4V to VIN levels. It allows direct interfacing with 1.8V or 3.3V microcontrollers without level shifters. Input thresholds scale with VIO: VIH = 0.7×VIO and VIL = 0.3×VIO. Pulling VIO to 1.8V ensures compatibility with low-voltage MCUs while maintaining noise margin; tying VIO to VIN enables 3.3V/5V bus operation. VIO must be externally decoupled with 100nF ceramic capacitor.
How does the RESET pin function on LM27965SQ-M/NOPB?
The RESET pin on LM27965SQ-M/NOPB is an active-low hardware reset input. When driven below 0.45V (typ.), it asynchronously forces all internal registers - including BankA/B/C brightness controls, enable bits, and general-purpose register - to their power-on default states and disables all LED current sinks. During normal operation, RESET must be held high (≥1.2V) via external pull-up. This pin enables robust system-level recovery from brownout or firmware lockup without requiring I²C commands, making LM27965SQ-M/NOPB suitable for safety-critical or field-deployed devices.
LM27965SQ-M/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-M/NOPB FAQ
1.How can I place an order for LM27965SQ-M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27965SQ-M/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-M/NOPB reliable?
The price and inventory of LM27965SQ-M/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-M/NOPB is usually 5 days.
3.What payment methods are accepted for LM27965SQ-M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27965SQ-M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27965SQ-M/NOPB?
LM27965SQ-M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27965SQ-M/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-M/NOPB?
For technical support, including LM27965SQ-M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27965SQ-M/NOPB requirements.
6.How does Aetrix verify that LM27965SQ-M/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27965SQ-M/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-M/NOPB meets industry standards.
7.What is the process for return or replacement of LM27965SQ-M/NOPB?
All LM27965SQ-M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27965SQ-M/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-M/NOPB part is unused and in its original packaging.
Return procedure for LM27965SQ-M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM27965SQ-M/NOPB Tags
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