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Texas Instruments LM27961TL/NOPB
- Part No.:
- LM27961TL/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 18-WFBGA
- Datasheet:
-
LM27961TL/NOPB.pdf
- Description:
- IC LED DRV RGLTR PWM 18DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,258
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Product details
Overview
LM27961TL/NOPB from Texas Instruments is a dual-group white LED driver IC with integrated 3/2× switched-capacitor boost converter, designed for mobile phone main/sub-display backlighting. It delivers up to 20mA per LED across four common-anode (Group A) and three common-cathode (Group B) outputs, operates from 2.7V–5.5V Li-ion input, and features independent resistor-programmable current control via ISETA/ISETB pins.
For engineers reviewing the LM27961TL/NOPB datasheet, LM27961TL/NOPB pinout, LM27961TL/NOPB application, or LM27961TL/NOPB equivalent, this page provides verified technical context, exact pin functions, real-world current matching data (±0.6% typ.), charge pump gain transition thresholds (4.55V/4.75V), and validated alternatives for dual-display LED backlight systems.
Technical Context
The LM27961TL/NOPB implements a dual-mode charge pump: 3/2× gain (≈1.5×VIN) below 4.75V input and 1× pass-through above 4.55V, minimizing power loss at higher battery voltages. Its internal bandgap reference (1.25V) biases two independent current mirror arrays - Group A (D1A–D4A) with low-side drivers for common-anode LEDs, and Group B (D1B–D3B) with high-side drivers for common-cathode LEDs.
Each group uses external RSET resistors to set output current via ISETA/ISETB pins (IDxx = 100 × 1.25V / RSETx), achieving ±0.6% typical current matching within groups. Soft-start limits inrush current during enable, and thermal shutdown engages at TJ ≈160°C with recovery at ≈120°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7V to 5.5V - supports full Li-ion battery discharge curve without external regulation. |
| Charge Pump Gain | 3/2× (1.5×VIN) below 4.75V; 1× (VIN) above 4.55V - auto-selects optimal efficiency mode. |
| LED Output Current | Up to 20mA per channel (Group A: 4 channels; Group B: 3 channels) - programmable via RSETA/RSETB. |
| Current Matching | ±0.6% typical between any two outputs in same group - ensures uniform display brightness. |
| Switching Frequency | 375–625kHz (typ. 500kHz) - enables use of small 1µF ceramic flying capacitors. |
| Quiescent Current | 4.4–6.75mA active; 2.3–5µA shutdown - extends battery life in standby. |
| Headroom Voltage | 320mV at 15mA - defines minimum voltage margin (VPOUT − VLED) required for regulation. |
Pinout & Package
LM27961TL/NOPB uses an 18-bump Thin DSBGA package (2.1mm × 2.4mm × 0.6mm, Package Number YZR0018) with 0.4mm pitch and large bumps for reliable board mounting.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (C1) | Main power input | Accepts 2.7V–5.5V Li-ion supply; feeds charge pump and internal circuitry. |
| GND (D2) | Ground reference | Common return for all currents; requires solid ground plane for noise control. |
| POUT (A3) | Charge pump output | Unregulated boosted voltage (~1.5×VIN or VIN); powers all LED current sources. |
| C1+, C1−, C2+, C2− (A1,B2,A5,E1 / D6,E5,D4,E3) | Flying capacitor connections | Interface with external 1µF ceramic caps to implement 3/2× charge pump topology. |
| D1A–D4A (D6,E5,D4,E3) | Group A LED outputs | Low-side current sinks for common-anode displays; each drives up to 20mA. |
| D1B–D3B (C5,B4,C3) | Group B LED outputs | High-side current sources for common-cathode sub-displays; each drives up to 20mA. |
| EN-A (B6), EN-B (A7) | Group enable inputs | Active-high logic; PWM dimming supported at 100Hz–1kHz; internal 300kΩ pull-down. |
| ISETA (E7), ISETB (C7) | Current set reference | 1.25V internal reference; RSETA/RSETB to GND sets Group A/B LED current (IDxx = 100 × 1.25V / RSETx). |
| CIN, CPOUT (not assigned to pins) | Bulk & output filtering | 1µF ceramic capacitors required at VIN and POUT to stabilize charge pump operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent LED groups | Group A (4× low-side) + Group B (3× high-side) enables simultaneous main + sub-display backlighting with separate brightness control. |
| Auto-switching charge pump | Seamlessly transitions between 3/2× boost and 1× pass-through modes at 4.55V/4.75V thresholds - eliminates need for external mode selection. |
| Resistor-programmable current | Two dedicated ISET pins (E7, C7) with 1.25V reference allow precise, temperature-stable current setting using standard 1% resistors. |
| High-current matching | ±0.6% typical matching within each group ensures <1% luminance variation across multi-LED displays - critical for uniform backlighting. |
| Integrated soft-start | 350µs typical startup time limits inrush current during enable - prevents input rail droop and reduces stress on input capacitors. |
Applications
| Mobile Phone Main Display Backlight | Mobile Phone Sub-Display Backlight |
|---|---|
Use Scenario: Driving 4 white LEDs behind a TFT-LCD main display in a feature phone or smartphone. IC Role / Device Role / Timing Role: Dual-mode charge pump LED driver providing regulated 15–20mA per LED with common-anode configuration. Use Value: Maintains consistent brightness across full Li-ion range (2.7V–4.2V) using 3/2× boost, then switches to efficient 1× mode above 4.55V. |
Use Scenario: Powering 3 white LEDs for secondary monochrome or OLED sub-display (e.g., flip phone cover screen). IC Role / Device Role / Timing Role: High-side current source driver for common-cathode LEDs, independently dimmable via EN-B PWM. Use Value: Enables independent brightness control of sub-display without affecting main display - supports dual UI modes. |
| Mobile Phone Keypad Lighting | Handheld PDA Display Backlight |
Use Scenario: Illuminating alphanumeric keypad with uniform light intensity across multiple keys. IC Role / Device Role / Timing Role: General-purpose LED driver using parallel-connected D1A/D2A outputs to drive higher-current key LEDs. Use Value: Programmable current (via RSETA) and PWM dimming (via EN-A) allow adjustable illumination level and low-power standby. |
Use Scenario: Backlighting QVGA or VGA LCD in industrial or consumer PDAs with extended battery life requirements. IC Role / Device Role / Timing Role: Dual-group driver supporting both primary display (Group A) and status indicator LEDs (Group B). Use Value: Single-chip solution reduces BOM count and PCB area vs. discrete LED drivers - critical for compact handheld form factors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-display white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM27962TL/NOPB | Same pinout and function but adds I²C interface for digital current/brightness control; no resistor programming required. | Replaces analog RSET-based dimming with programmable digital control - suitable for systems requiring dynamic brightness adjustment. | Select LM27962TL/NOPB when firmware-controlled dimming or channel grouping flexibility is needed; LM27961TL/NOPB remains optimal for cost-sensitive, fixed-brightness designs. |
| TPS61160DRVR | Single-output 3/2× boost LED driver with 30mA max; no dual-group architecture or common-cathode support. | Limited to single-display or mono-LED applications; requires two ICs to match LM27961TL/NOPB's 7-channel capability. | Choose TPS61160DRVR only for simpler single-group lighting; LM27961TL/NOPB provides integrated dual-group functionality with lower system-level component count. |
Compared with LM27962TL/NOPB, LM27961TL/NOPB offers lower BOM cost and simpler layout by eliminating I²C routing, while retaining identical analog dimming performance. Against TPS61160DRVR, LM27961TL/NOPB delivers 7 independent outputs in one chip versus two separate ICs - reducing footprint, assembly cost, and power path complexity.
Availability
LM27961TL/NOPB is available at Aetrix Electronics and suitable for mobile phone display lighting, keypad illumination, and handheld PDA backlighting requiring stable component supply across production lifecycles.
Supply support for LM27961TL/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 power-efficient IC design.
The LM27961TL/NOPB belongs to TI's white LED backlight driver product line, engineered specifically for dual-display mobile devices requiring high-current matching, wide-input-voltage operation, and minimal external components.
FAQ
What is the maximum LED forward voltage the LM27961TL/NOPB can support at 2.7V input?
At 2.7V input, the LM27961TL/NOPB's 3/2× charge pump delivers ~4.05V at POUT. With 320mV headroom requirement and 2.7Ω output resistance, it supports up to ~3.5V LED forward voltage when driving 4×15mA (total 60mA) - verified in TI's Electrical Characteristics table under 2.7V ≤ VIN ≤ 3.0V condition.
How does the LM27961TL/NOPB handle PWM dimming without causing visible flicker?
The LM27961TL/NOPB accepts 100Hz–1kHz PWM signals directly on EN-A or EN-B pins. Its internal soft-start and fast 350µs turn-on time ensure smooth LED current transitions, while the 100Hz minimum frequency avoids perceptible flicker - confirmed in the Applications Information section on PWM control.
Can the LM27961TL/NOPB drive common-cathode LEDs in Group A or common-anode LEDs in Group B?
No. Group A (D1A–D4A) outputs are low-side current sinks optimized for common-anode LEDs only; Group B (D1B–D3B) outputs are high-side current sources for common-cathode LEDs only - explicitly defined in the Pin Descriptions and Circuit Description sections of the datasheet.
What capacitor types are mandatory for stable LM27961TL/NOPB operation?
LM27961TL/NOPB requires X5R or X7R multilayer ceramic capacitors (MLCCs) rated ≥10V for CPOUT and ≥VIN for CIN/C1/C2. Y5V/Z5U ceramics are prohibited due to excessive capacitance drift (>−80%) over temperature - specified in the Capacitor Selection section.
Does the LM27961TL/NOPB include thermal protection, and how does it behave?
Yes. The LM27961TL/NOPB incorporates thermal shutdown that disables all outputs when junction temperature exceeds ~160°C (typ.), and automatically recovers when temperature falls below ~120°C (typ.) - documented in Absolute Maximum Ratings and Thermal Protection sections.
LM27961TL/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 18-WFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Switched Capacitor (Charge Pump)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 7
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 20mA
- Frequency:
- 500kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -30°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 18-DSBGA
LM27961TL/NOPB FAQ
1.How can I place an order for LM27961TL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM27961TL/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 LM27961TL/NOPB reliable?
The price and inventory of LM27961TL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM27961TL/NOPB is usually 5 days.
3.What payment methods are accepted for LM27961TL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM27961TL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM27961TL/NOPB?
LM27961TL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM27961TL/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 LM27961TL/NOPB?
For technical support, including LM27961TL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM27961TL/NOPB requirements.
6.How does Aetrix verify that LM27961TL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM27961TL/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 LM27961TL/NOPB meets industry standards.
7.What is the process for return or replacement of LM27961TL/NOPB?
All LM27961TL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM27961TL/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 LM27961TL/NOPB part is unused and in its original packaging.
Return procedure for LM27961TL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM27961TL/NOPB Tags
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