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Texas Instruments LM36272YFFR
- Part No.:
- LM36272YFFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-UFBGA, DSBGA
- Datasheet:
-
LM36272YFFR.pdf
- Description:
- IC LED DRV RGLTR PWM 24DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,769
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Product details
Overview
LM36272YFFR from Texas Instruments is a dual-channel WLED backlight driver with integrated LCD bias power supply (±4 V to ±6.5 V), supporting up to two parallel LED strings (30 mA per string, 29-V max VOUT) and programmable LCM bias outputs. It operates from 2.7 V to 5 V input, delivers 92% backlight/LCM efficiency, and enables zone dimming via independent LED string enable control - used in smartphone and tablet display power management.
For engineers reviewing the LM36272YFFR datasheet, LM36272YFFR pinout, LM36272YFFR application, or LM36272YFFR equivalent, key selection criteria include its dual-boost architecture (backlight + LCM), 11-bit exponential/linear dimming, I²C + PWM brightness control, matched LED current (±0.2%), and DSBGA-24 (2.44 mm × 1.67 mm) package for ultra-compact display subsystems.
Technical Context
The LM36272YFFR integrates three independent switching regulators: a backlight boost (500 kHz / 1 MHz selectable), an LCM bias boost (2.5 MHz), and an inverting charge pump for VNEG generation, all coordinated with auto-sequencing and slew-rate-controlled startup. Its dual-current-sink architecture supports independent on/off control of LED1 and LED2 with <0.2% matching across 60 µA–30 mA.
Control is implemented via I²C (Fast Mode, 1 MHz) and hardware pins: HWEN (active-high enable), PWM (11-bit resolution, 50 Hz–50 kHz), LCM_EN1/EN2 (VPOS/VNEG enables with 300-kΩ internal pulldowns), and dedicated bias output monitoring (BL_OUT, LCM_OUT). The device includes overvoltage protection (29 V for backlight, 7.8 V for LCM), thermal shutdown (140 °C), and robust ESD ratings (±2 kV HBM).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5 V - compatible with single-cell Li-ion/Li-poly battery rails without external regulation. |
| Max LED Current per String | 30 mA - supports up to 8 LEDs/string at typical forward voltage (e.g., 3.2 V × 8 = 25.6 V), within 29-V VOUT limit. |
| LED Current Accuracy | ±3% - ensures consistent brightness across temperature (−40 °C to 85 °C) and input voltage variation. |
| VPOS / VNEG Range | ±4 V to ±6.5 V in 50-mV steps - programmable to match TFT panel bias requirements without external DACs. |
| Backlight Boost Efficiency | 90% at 3.6 V input, 5 mA/string - minimizes thermal load and extends battery life in portable displays. |
| I²C Interface Speed | Up to 1 MHz (Fast Mode) - enables rapid brightness updates and register configuration during dynamic content rendering. |
| Shutdown Current | 0.2 µA - critical for low-power display sleep modes in always-on UI applications. |
Pinout & Package
LM36272YFFR uses a 24-pin DSBGA (YFF) package measuring 2.44 mm × 1.67 mm with 0.4-mm pitch, optimized for space-constrained mobile display modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 / LED2 | Current sink inputs | Connect cathodes of two independent LED strings; each sinks 60 µA–30 mA with ±0.2% matching. |
| BL_SW / BL_SW (F3, F4) | Backlight boost switch node | Dual-source connection for high-current inductor drive; supports up to 2.5 W backlight power. |
| VPOS / VNEG | Programmable LCD bias outputs | VPOS: post-regulated positive LDO output (4–6.5 V); VNEG: regulated inverting charge pump output (−4 to −6.5 V). |
| LCM_EN1 / LCM_EN2 | Enable inputs for VPOS / VNEG | 300-kΩ internal pulldown - allows independent sequencing and power gating of positive/negative bias rails. |
| PWM | Brightness control input | 11-bit resolution PWM (50 Hz–50 kHz) for content-adaptive backlight control (CABC) without I²C traffic. |
| HWEN | Hardware enable | Active-high global enable; 300-kΩ internal pulldown ensures safe default-off state at power-up. |
| SCL / SDA | I²C interface | Fully compliant Fast Mode (1 MHz) interface for configuring dimming curves, OVP thresholds, and bias voltages. |
| AGND / BL_GND / LCM_GND / CP_GND | Ground terminals | Separate analog, backlight, LCD bias, and charge-pump grounds - minimize noise coupling between power domains. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent LED current sinks | Enables zone dimming for local contrast enhancement in AMOLED/LCD panels without external current mirrors. |
| 11-bit exponential + linear dimming | Exponential mode matches human eye perception (0.304% step ratio); linear mode provides precise calibration control. |
| Integrated LCM bias power (VPOS + VNEG) | Eliminates need for discrete charge pumps and LDOs - reduces BOM count by ≥4 components in display power tree. |
| Auto-sequenced bias startup | Programmable delay and slew rate between VPOS and VNEG activation prevents panel latch-up during power-up. |
| Backlight boost frequency select (500 kHz / 1 MHz) | Allows trade-off between inductor size (4.7–15 µH) and efficiency - 1 MHz enables <1 mm² solution area. |
Applications
| Smartphone Display Power | Tablet LCD Bias Management |
|---|---|
|
Use Scenario: Driving dual LED strings in a 6-inch OLED display with dynamic local dimming and CABC. IC Role / Device Role / Timing Role: LM36272YFFR acts as primary display power IC - regulating backlight current, generating VPOS/VNEG for TFT gate drivers, and synchronizing dimming via PWM/I²C. Use Value: Achieves >90% system efficiency at 3.6 V input while maintaining <0.2% LED current matching across operating temperature range. |
Use Scenario: Powering a 10.1-inch IPS LCD panel requiring ±5.5 V bias rails and 20-mA backlight per string. IC Role / Device Role / Timing Role: LM36272YFFR integrates backlight boost, LCM bias boost, and inverting charge pump - replacing three discrete DC/DC stages. Use Value: Reduces PCB area by 35% vs. discrete solution and eliminates external sequencing circuitry via auto-sequenced VPOS→VNEG startup. |
| Home Automation Panel Backlight | Gaming Tablet Zone Dimming |
|
Use Scenario: Controlling brightness of a 7-inch resistive touch display in industrial HMI with ambient light sensing. IC Role / Device Role / Timing Role: LM36272YFFR receives I²C commands from MCU to adjust LED current and bias voltages based on sensor feedback. Use Value: 11-bit dimming resolution enables smooth 1000:1 brightness scaling; shutdown current <0.3 µA extends battery runtime in standby. |
Use Scenario: Implementing dynamic contrast zones in a 9.7-inch gaming tablet with split-screen UI rendering. IC Role / Device Role / Timing Role: LM36272YFFR independently enables/disables LED1 and LED2 strings under GPU command to dim specific screen regions. Use Value: Independent string control enables real-time zone dimming without frame buffer reprocessing or additional display controller logic. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel display power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3630AYFFR | Single-channel WLED driver (no integrated LCM bias); 30-V max VOUT; 1.2-MHz fixed switching frequency. | Requires external charge pump/LDO for VPOS/VNEG; suitable only when bias rails are generated elsewhere. | Select when display design already includes discrete bias power or uses simpler single-string backlighting. |
| TPS65136RGTR | Dedicated LCD bias IC (±6.5 V, 80 mA) with no backlight capability; requires separate WLED driver. | No backlight integration - increases component count and inter-IC timing coordination overhead. | Select when bias rail precision and ripple performance are prioritized over integration, and backlight is handled by another IC. |
Compared with LM36272YFFR, LM3630AYFFR reduces integration by omitting LCM bias functions but offers higher backlight switching frequency, while TPS65136RGTR delivers superior bias rail accuracy and lower noise at the cost of requiring a second IC for backlight - making LM36272YFFR optimal for space- and BOM-constrained dual-rail display systems.
Availability
LM36272YFFR is available at Aetrix Electronics and suitable for smartphone display subsystems, tablet LCD power trees, and home automation HMI panels requiring stable component supply and long-term manufacturability.
Supply support for LM36272YFFR 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 and embedded processing technologies, with decades of expertise in power management ICs for portable and display applications.
The LM36272YFFR belongs to TI's display power management product line, designed specifically to consolidate backlight and LCD bias functions into a single ultra-compact package for next-generation mobile and embedded displays.
FAQ
What is the maximum number of LEDs supported by the LM36272YFFR?
The LM36272YFFR supports up to two parallel white LED strings, with up to eight LEDs per string - limited by its 29-V maximum output voltage and 30-mA per-string current capability. Total LED count depends on forward voltage: for typical 3.2-V LEDs, 2 × 8 = 16 LEDs is achievable. The LM36272YFFR does not drive serial strings beyond this configuration.
Does the LM36272YFFR support both I²C and PWM brightness control simultaneously?
Yes, the LM36272YFFR supports concurrent I²C and PWM brightness control: I²C sets the base LED current level and dimming curve (exponential/linear), while PWM provides real-time modulation for content-adaptive backlight control (CABC). The final LED current is the product of both settings, enabling fine-grained dynamic adjustment without bus contention.
What are the ground pin separation requirements for LM36272YFFR layout?
The LM36272YFFR has four dedicated ground pins: AGND (analog reference), BL_GND (backlight capacitor return), LCM_GND (LCD bias capacitor return), and CP_GND (charge pump return). These must be routed to separate copper polygons on the PCB and joined at a single star point near the device to prevent noise coupling - especially critical for maintaining <0.2% LED current matching and low VNEG ripple.
Can the LM36272YFFR generate asymmetric bias voltages such as +5.2 V and −4.8 V?
Yes, the LM36272YFFR independently programs VPOS and VNEG in 50-mV steps across ±4 V to ±6.5 V ranges. Setting VPOS = +5.2 V and VNEG = −4.8 V is fully supported via I²C register writes (0x0A/0x0B for VPOS, 0x0C/0x0D for VNEG), enabling custom bias configurations for advanced TFT panels without external trimming.
What protection features are built into the LM36272YFFR?
The LM36272YFFR includes overvoltage protection (29 V on BL_OUT, 7.8 V on LCM_OUT), thermal shutdown (140 °C), cycle-by-cycle current limiting on BL_SW (792–2016 mA depending on code), short-circuit protection on VNEG, and robust ESD tolerance (±2 kV HBM). These operate autonomously without firmware intervention, ensuring reliable operation in consumer display environments.
LM36272YFFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 2
- Voltage - Supply (Min):
- 2.7V
- Voltage - Supply (Max):
- 5V
- Voltage - Output:
- 29V
- Current - Output / Channel:
- 30mA
- Frequency:
- -
- Dimming:
- Analog, I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-DSBGA (2.59x1.89)
LM36272YFFR FAQ
1.How can I place an order for LM36272YFFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM36272YFFR 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 LM36272YFFR reliable?
The price and inventory of LM36272YFFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM36272YFFR is usually 5 days.
3.What payment methods are accepted for LM36272YFFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM36272YFFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM36272YFFR?
LM36272YFFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM36272YFFR 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 LM36272YFFR?
For technical support, including LM36272YFFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM36272YFFR requirements.
6.How does Aetrix verify that LM36272YFFR is sourced from the original manufacturer or authorized distributors?
All LM36272YFFR 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 LM36272YFFR meets industry standards.
7.What is the process for return or replacement of LM36272YFFR?
All LM36272YFFR units undergo pre-shipment inspection (PSI). If there is an issue with LM36272YFFR, 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 LM36272YFFR part is unused and in its original packaging.
Return procedure for LM36272YFFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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