My Inquiry
My Account
Texas Instruments LM27965SQX/NOPB
- Part No.:
- LM27965SQX/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-WFQFN Exposed Pad
- Datasheet:
-
LM27965SQX/NOPB.pdf
- Description:
- IC LED DRV RGLTR I2C 30MA 24WQFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM27965SQX/NOPB from Texas Instruments is a charge-pump-based dual-display white LED driver IC with I²C-compatible brightness control. It delivers up to 180mA total output current across three independently controlled banks (BankA: up to 5 LEDs, BankB: up to 3 LEDs, BankC: 1 indicator LED), supports 2.7V–5.5V input, achieves 91% peak efficiency, and maintains 0.3% current matching between LEDs in same bank - used in mobile phone main/sub display backlighting.
For engineers reviewing the LM27965SQX/NOPB datasheet, LM27965SQX/NOPB pinout, LM27965SQX/NOPB application, or LM27965SQX/NOPB equivalent, key selection considerations include adaptive 1×/3/2× charge-pump gain switching, resistor-programmable full-scale current via ISET/RSET, 32-level I²C brightness control for Banks A/B, 4-level analog dimming for Bank C, and WQFN-24 (4mm × 4mm) package thermal performance.
Technical Context
The LM27965SQX/NOPB integrates an adaptive CMOS charge pump that dynamically selects 1× (pass-through) or 3/2× gain based on real-time forward voltage monitoring of active DxA/DxB pins - ensuring optimal efficiency across 2.7V–5.5V input and 2.0V–4.0V LED VF. Gain transition occurs at ~175mV headroom threshold to prevent current sink pinch-off.
It implements three independent current-sink banks: BankA (D1A–D5A, 5-channel), BankB (D1B–D3B, 3-channel), and BankC (D1C, 1-channel), each with separate enable and brightness registers. BankA/B use mixed analog + 20kHz PWM dimming (32 levels); BankC uses 4-level analog scaling only. All banks share one RSET/ISET current-setting network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Total Output Current | 180mA maximum - distributed across BankA (≤125mA), BankB (≤45mA), BankC (≤30mA) without violating per-pin limits. |
| LED Current Matching | 0.3% typical - ensures uniform brightness across LEDs within same bank under varying input voltage and temperature. |
| Charge Pump Efficiency | 91% peak - achieved by eliminating inductor and using adaptive gain switching instead of fixed boost topology. |
| I²C Address Options | 0x36 (LM27965SQX/NOPB) - enables co-location with LM27965-M (0x38) on same bus without address conflict. |
| Input Voltage Range | 2.7V to 5.5V - compatible with single-cell Li-ion battery systems including discharge tail-end down to 2.7V. |
| Headroom Requirement | 110mV at 15mA - minimum VPOUT–VLED needed for stable current regulation; impacts minimum usable LED forward voltage. |
| Switching Frequency | 1.27MHz typical - high-frequency operation minimizes required flying capacitor size (C1/C2 = 1µF ceramic). |
Pinout & Package
LM27965SQX/NOPB is housed in a 24-pin WQFN package (RTW0024A), 4.0mm × 4.0mm × 0.8mm, with exposed thermal pad (DAP) connected to GND for enhanced power dissipation (θJA = 41.3°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (24) | Power Input | Supplies charge pump and internal circuitry; accepts 2.7V–5.5V; requires local 1µF CIN decoupling. |
| POUT (23) | Charge Pump Output | Regulated output node feeding all LED anodes; voltage adapts between VIN (1×) and 1.5×VIN (3/2×) based on load. |
| ISET (17) | Current Reference Input | Sets full-scale LED current for all banks via external RSET: IDxx = 200 × (1.25V / RSET). |
| SCL (1), SDIO (2) | I²C Interface | Standard bidirectional I²C bus interface; referenced to VIO; supports 100kHz/400kHz modes. |
| VIO (7) | I²C Logic Level Reference | Defines logic thresholds for SCL/SDIO; must be ≥1.4V and ≤VIN; decoupled with 100nF to GND. |
| RESET (10) | Hardware Reset | Active-low asynchronous reset; pulls all registers to default and disables outputs when <0.45V. |
| GND (9, 18, DAP) | Ground Return | Three dedicated GND pins plus exposed DAP - mandatory for thermal and noise integrity. |
| D1A–D5A (12–16) | BankA LED Sinks | Five constant-current sinks for main display LEDs; each supports ≤30mA; monitored for gain control. |
| D1B–D3B (4–6) | BankB LED Sinks | Three constant-current sinks for sub-display LEDs; each supports ≤30mA; monitored for gain control. |
| D1C (3) | BankC Indicator Sink | Single constant-current sink for status LED; supports ≤30mA; not monitored - fixed gain operation. |
Key Features
| Feature | Design Value |
|---|---|
| No-inductor charge-pump architecture | Eliminates EMI-sensitive magnetics and reduces BOM cost/size - enables 25mm² total solution area. |
| Adaptive 1×/3/2× gain selection | Automatically switches between pass-through and charge-pump modes based on real-time LED VF, maximizing efficiency across full input range. |
| Independent triple-bank control | Enables simultaneous main display (BankA), sub-display (BankB), and indicator (BankC) lighting with separate brightness registers and enable bits. |
| Resistor-programmable full-scale current | Single RSET sets base current for all banks; simplifies design vs. multiple current-setting resistors or DACs. |
| Hardware RESET pin with voltage threshold | Provides deterministic power-cycle recovery without I²C traffic - critical for robust mobile system boot sequences. |
Applications
| Mobile Phone Main Display Backlight | PDA Sub-Display Lighting |
|---|---|
Use Scenario: Driving 5 white LEDs (3.6VF) in parallel for primary LCD backlight in compact handheld device powered by single Li-ion cell (2.7–4.2V). IC Role / Device Role / Timing Role: Constant-current LED driver with adaptive charge-pump gain and I²C brightness control - regulates current despite input voltage sag and LED VF variation. Use Value: Maintains consistent luminance across battery discharge cycle while achieving >90% efficiency at 3.6V input - extends runtime and reduces thermal load. |
Use Scenario: Powering 3 white LEDs (3.2VF) for secondary monochrome display in PDA, requiring independent dimming from main display. IC Role / Device Role / Timing Role: Secondary LED current sink bank (BankB) with dedicated 32-level I²C brightness register - enables synchronized or independent UI feedback. Use Value: Eliminates need for second LED driver IC; shares RSET, POUT, and I²C bus - reduces PCB area and component count by 40% vs. discrete solutions. |
| Indicator LED Driver | Compact Portable Device Lighting |
Use Scenario: Driving single status LED (2.8VF) for power-on indication or charging state in Bluetooth headset or smartwatch. IC Role / Device Role / Timing Role: Dedicated BankC current sink (D1C) with 4-level analog dimming - provides simple, low-noise indicator control without PWM artifacts. Use Value: Avoids audible coil whine or EMI from PWM-driven indicators; supports ultra-low quiescent current (5.4µA shutdown) for always-on applications. |
Use Scenario: General-purpose white LED lighting in space-constrained portable medical or industrial handheld devices with variable battery voltage. IC Role / Device Role / Timing Role: Integrated triple-bank LED driver supporting flexible configuration (e.g., 4+2+1 or 5+3+0) - adapts to diverse optical layouts without redesign. Use Value: Single-WQFN solution replaces 3 discrete drivers + charge-pump IC + level-shifter - cuts BOM cost by ~35% and layout time by 50%. |
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 |
|---|---|---|---|
| LM27964SQX/NOPB | Same WQFN-24 package and pinout; identical charge-pump architecture but only two banks (BankA/B), no BankC indicator sink. | Lacks dedicated D1C driver - requires external circuit for indicator LED; fewer brightness registers (no C0h). | Select when only main/sub display lighting is needed and indicator function is handled separately. |
| TPS61165DRVR | Boost-based (inductor-required) single-output LED driver; 30V max VOUT; no multi-bank structure or I²C interface - uses analog/PWM dimming only. | Cannot drive dual independent displays; requires external MOSFETs and level shifters for multi-LED configurations. | Select when higher VOUT (>5.5V) or higher per-LED current (>30mA) is required, and board space allows inductor placement. |
Compared with LM27965SQX/NOPB, LM27964SQX/NOPB offers identical efficiency and matching but lacks BankC flexibility, while TPS61165DRVR trades integration and inductor-free operation for higher voltage capability - making LM27965SQX/NOPB optimal for compact dual-display systems with indicator needs.
Availability
LM27965SQX/NOPB is available at Aetrix Electronics and suitable for mobile phone backlighting, PDA display modules, and portable medical device indicator lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM27965SQX/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 over 50 years of innovation in precision analog ICs and energy-efficient power solutions.
The LM27965SQX/NOPB belongs to TI's white LED driver product line, designed specifically for space-constrained portable electronics requiring high-efficiency, multi-bank, I²C-controllable backlighting with minimal external components.
FAQ
What is the maximum LED forward voltage supported by LM27965SQX/NOPB at 3.6V input?
At 3.6V input, LM27965SQX/NOPB supports up to 4.0V LED forward voltage in 3/2× mode (POUT ≈ 5.4V), provided headroom remains ≥110mV. With 3.6V VF, headroom is ~1.8V - well above requirement. Below 3.2V input, VF must be reduced to maintain regulation; see Equation 6 in datasheet SNVS380B.
How does LM27965SQX/NOPB achieve 0.3% current matching between LEDs?
LM27965SQX/NOPB achieves 0.3% typical current matching through laser-trimmed, matched current-sink transistor arrays within each bank (BankA/B), combined with shared reference voltage (1.25V at ISET) and low-drift internal amplifiers - verified across temperature (-30°C to +100°C) and input voltage (2.7V–5.5V).
Can LM27965SQX/NOPB drive more than one LED in parallel per channel?
Yes - LM27965SQX/NOPB allows parallel connection of D1A–D5A or D1B–D3B outputs to drive higher-current single LEDs. For example, connecting all five BankA sinks drives one LED at 5× per-sink current. RSET must be recalculated to keep per-sink current ≤30mA; unused pins must be terminated to avoid gain-control errors.
What is the function of the NC pins (8 and 11) on LM27965SQX/NOPB?
Pins 8 and 11 on LM27965SQX/NOPB are No Connect (NC) - internally unconnected and electrically floating. They must not be tied to any voltage or signal; leaving them unconnected is required. Routing traces or vias to these pads may cause parasitic coupling or thermal imbalance in the WQFN package.
Does LM27965SQX/NOPB support automatic gain switching during operation?
Yes - LM27965SQX/NOPB continuously monitors voltage at active DxA/DxB pins and automatically switches between 1× (pass-through) and 3/2× charge-pump gain modes. Transition occurs when any monitored pin's headroom drops to ~175mV, ensuring uninterrupted current regulation without firmware intervention.
LM27965SQX/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, Lighting
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-WQFN (4x5)
LM27965SQX/NOPB FAQ
1.How can I place an order for LM27965SQX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27965SQX/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 LM27965SQX/NOPB reliable?
The price and inventory of LM27965SQX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27965SQX/NOPB is usually 5 days.
3.What payment methods are accepted for LM27965SQX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27965SQX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27965SQX/NOPB?
LM27965SQX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27965SQX/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 LM27965SQX/NOPB?
For technical support, including LM27965SQX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27965SQX/NOPB requirements.
6.How does Aetrix verify that LM27965SQX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27965SQX/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 LM27965SQX/NOPB meets industry standards.
7.What is the process for return or replacement of LM27965SQX/NOPB?
All LM27965SQX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27965SQX/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 LM27965SQX/NOPB part is unused and in its original packaging.
Return procedure for LM27965SQX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM27965SQX/NOPB Tags
-
BCR402RE6327HTSA1
Infineon Technologies
-
BCR430UXTSA2
Infineon Technologies
-
BCR420UE6433HTMA1
Infineon Technologies
-
BCR420UE6327HTSA1
Infineon Technologies
-
BCR421UE6327HTSA1
Infineon Technologies
-
LYT1604D-TL
Power Integrations
-
HV9910CLG-G
Microchip Technology
-
CL2N8-G
Microchip Technology
-
BCR420UW6-7
Diodes Incorporated
-
BCR421UW6-7
Diodes Incorporated
-
BCR420UFD-7
Diodes Incorporated
-
BCR421UFD-7
Diodes Incorporated
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
