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Texas Instruments LM36273YFFR
- Part No.:
- LM36273YFFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 24-UFBGA, DSBGA
- Datasheet:
-
LM36273YFFR.pdf
- Description:
- IC LED DRV RGLTR PWM 24DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,466
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Product details
Overview
LM36273YFFR from Texas Instruments is a three-channel WLED backlight driver with integrated LCD bias power supply (±4 V to ±6.5 V), supporting up to 24 LEDs across three parallel strings. It delivers 30 mA per string with 0.2% current matching and 11-bit dimming control via I²C or PWM, operating from 2.7 V to 5 V input in smartphones and tablets.
For engineers reviewing the LM36273YFFR datasheet, LM36273YFFR pinout, LM36273YFFR application, or LM36273YFFR equivalent, key selection considerations include programmable LCM bias sequencing, 92% backlight/LCM efficiency, 500 kHz/1 MHz boost switching frequency selection, and DSBGA-24 package thermal performance (RθJA = 63.1°C/W).
Technical Context
The LM36273YFFR integrates an asynchronous backlight boost converter (29 V max output) with three independent current sinks and a synchronous LCM bias boost feeding both a post-regulated LDO (VPOS) and a regulated inverting charge pump (VNEG). Its dual-path architecture enables coordinated startup with programmable slew rate and auto-sequencing between positive and negative bias rails.
Control is implemented via I²C fast-mode interface (1 MHz) and hardware PWM input (11-bit resolution, 50 Hz–50 kHz), with independent enable pins (LCM_EN1/LCM_EN2) and active-high HWEN. The device supports zone dimming through per-string LEDx sink enable/disable and offers selectable current limit codes (792–2016 mA) for the backlight switch.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5 V - compatible with single-cell Li-ion and USB-powered systems without external regulation |
| Max LED Current per String | 30 mA - supports high-brightness WLED strings up to 8 LEDs each at full drive |
| LED Current Matching | ±0.2% - ensures uniform luminance across three backlight zones without software calibration |
| VPOS/VNEG Output Range | ±4 V to ±6.5 V in 50-mV steps - covers standard TFT-LCD gate driver and source driver voltage requirements |
| Backlight Boost Efficiency | 90% at 5 mA/string - minimizes thermal load in space-constrained mobile PCBs |
| LCM Bias Efficiency | 92% at 5.9 V / 6–160 mA - reduces power loss in high-current LCD bias generation |
| Switching Frequency Options | 500 kHz or 1 MHz - allows trade-off between inductor size (4.7–15 µH) and EMI profile |
Pinout & Package
LM36273YFFR uses a 24-pin DSBGA (YFF) package measuring 2.44 mm × 1.67 mm with 0.4-mm pitch. The ultra-compact footprint supports high-density mobile display power designs while maintaining thermal performance (RθJA = 63.1°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1–LED3 | Current sink inputs | Connect cathodes of three independent WLED strings; each supports 60 µA–30 mA with matched regulation |
| BL_SW / BL_SW | Backlight boost switch node | Dual-source connection for high-current inductor routing; supports >2 A peak switch current |
| LCM_SW | LCM bias boost switch node | Drives synchronous boost stage for VPOS/VNEG generation; optimized for 2.5 MHz operation |
| VPOS / VNEG | Programmable bias outputs | Post-regulated positive (4–6.5 V) and charge-pump negative (–4 to –6.5 V) supplies for LCD panel drivers |
| LCM_EN1 / LCM_EN2 | Enable inputs | Independent 300-kΩ pulldown-controlled enables for VPOS and VNEG; support staggered startup sequencing |
| PWM | Brightness control input | 11-bit resolution PWM interface (50 Hz–50 kHz) for content-adaptive backlight control (CABC) |
| SCL / SDA | I²C interface | Fast-mode (1 MHz) serial bus for register configuration, status readback, and dynamic parameter updates |
| HWEN | Hardware enable | Active-high chip enable with internal 300-kΩ pulldown; controls global device power state and reset behavior |
Key Features
| Feature | Design Value |
|---|---|
| Three-channel WLED driver + LCD bias power | Single-chip solution eliminates discrete boost, LDO, and charge pump ICs-reducing BOM count by ≥5 components |
| 11-bit exponential/linear dimming | Enables smooth, flicker-free brightness transitions across 2048 steps without external microcontroller interpolation |
| Programmable VPOS/VNEG slew rate | Prevents LCD panel latch-up during power-up by controlling voltage ramp time on both bias rails |
| Auto-sequenced bias startup | Guarantees VPOS powers before VNEG with user-defined delay-meeting TFT-LCD absolute maximum timing requirements |
| Per-string LED enable/disable | Supports local dimming zones by independently disabling LED1/LED2/LED3 without affecting other channels or bias supplies |
| Low quiescent current modes | 2.8 µA shutdown current and 7 µA standby current extend battery life in always-on display applications |
Applications
| Smartphone Display Power | Tablet LCD Backlight Control |
|---|---|
Use Scenario: Dual-display smartphone with main AMOLED and secondary TFT-LCD panel requiring independent bias and backlight control. IC Role / Device Role / Timing Role: LM36273YFFR provides synchronized VPOS/VNEG generation and three-zone WLED driving for the TFT panel while enabling CABC via PWM input. Use Value: Eliminates need for separate LCM bias IC and reduces total solution area by 35% versus discrete implementation. |
Use Scenario: 10-inch tablet with edge-lit WLED backlight and high-resolution IPS LCD requiring precise luminance uniformity. IC Role / Device Role / Timing Role: LM36273YFFR drives three parallel LED strings with 0.2% current matching and adjusts VPOS/VNEG dynamically during video playback. Use Value: Achieves <±1% luminance variation across display surface without factory calibration due to inherent current matching. |
| Gaming Tablet Panel Management | Home Automation Display Interface |
Use Scenario: High-refresh-rate gaming tablet with adaptive sync requiring rapid backlight dimming response and stable bias under transient loads. IC Role / Device Role / Timing Role: LM36273YFFR uses I²C register writes to update LED current in <100 µs and maintains VPOS/VNEG regulation during 100 mA load transients. Use Value: Enables sub-frame backlight modulation for motion blur reduction without visible bias rail droop or flicker. |
Use Scenario: Industrial-grade home automation panel with wide-temperature TFT display operating from –40°C to 85°C ambient. IC Role / Device Role / Timing Role: LM36273YFFR delivers guaranteed 30 mA LED current and ±6.5 V bias across full temperature range using internal trimming. Use Value: Maintains display contrast ratio >500:1 over industrial temperature range without external compensation circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LCD backlight and bias power applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3630AYFFR | Two-channel WLED driver only; no integrated VNEG charge pump or VPOS LDO | Requires external negative bias generator for TFT panels needing dual-rail bias | Select when only backlight control is needed and LCM bias is handled separately |
| TPS65136RGTR | Dedicated dual-output LCM bias IC (no LED driving); higher VPOS/VNEG current (120 mA) | Lacks backlight functionality-must pair with standalone WLED driver like TPS61165 | Select when bias current >80 mA is required and system already includes discrete LED driver |
Compared with LM3630AYFFR and TPS65136RGTR, the LM36273YFFR uniquely integrates full backlight + dual-rail bias in one die, reducing PCB area by ≥40% and eliminating inter-IC timing coordination-critical for compact mobile displays.
Availability
LM36273YFFR is available at Aetrix Electronics and suitable for smartphone display power, tablet backlight control, and home automation panel interfaces requiring stable component supply and long-term production continuity.
Supply support for LM36273YFFR 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 company specializing in analog and embedded processing technologies, with leadership in power management and display interface solutions.
The LM36273YFFR belongs to TI's display power management IC portfolio, designed specifically for space-constrained mobile devices requiring integrated backlight and LCD bias functionality without compromising efficiency or precision.
FAQ
What is the maximum number of LEDs supported by the LM36273YFFR?
The LM36273YFFR supports up to 24 white LEDs total-eight per string across three independent current sinks (LED1–LED3). Each string operates up to 29 V output voltage, accommodating common 6–8 LED series configurations at 3.0–3.6 V forward voltage per diode. The LM36273YFFR does not support more than three strings or exceed 30 mA per string under recommended conditions.
Does the LM36273YFFR support both I²C and PWM dimming simultaneously?
Yes, the LM36273YFFR supports concurrent I²C and PWM dimming: I²C sets the base LED current level (11-bit exponential or linear), while the PWM input modulates that level in real time for content-adaptive backlight control (CABC). The LM36273YFFR internally combines both signals without conflict, enabling dynamic brightness scaling during video playback.
What is the purpose of the dual BL_SW pins on the LM36273YFFR?
The LM36273YFFR features two BL_SW pins (F3 and F4) to handle high peak currents (>2 A) in the backlight boost inductor path. This dual-terminal layout reduces trace resistance and inductance, minimizing voltage spikes and improving thermal distribution across the DSBGA package. It is not a redundancy feature-the LM36273YFFR requires both pins to be connected to the same inductor node.
How does the LM36273YFFR ensure safe startup sequencing for LCD bias rails?
The LM36273YFFR implements hardware-enforced auto-sequencing: VPOS must reach 90% of target before VNEG begins ramping, with programmable delay (0–10 ms) and slew rate control. This prevents reverse-bias damage to TFT-LCD panels. The LM36273YFFR achieves this via internal state machine-not external timers-ensuring repeatable, temperature-stable sequencing every power cycle.
Can the LM36273YFFR operate with inductors outside the 4.7 µH–15 µH range?
No-the LM36273YFFR's backlight boost controller is characterized and specified only for 4.7 µH to 15 µH inductors. Using values outside this range may cause instability, excessive ripple, or failure to regulate at low input voltages (e.g., 2.7 V). The LM36273YFFR's internal compensation and current limit thresholds assume inductance within this band per TI SNVSAJ8D datasheet Section 8.2.
LM36273YFFR 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:
- 3
- 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)
LM36273YFFR FAQ
1.How can I place an order for LM36273YFFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM36273YFFR 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 LM36273YFFR reliable?
The price and inventory of LM36273YFFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM36273YFFR is usually 5 days.
3.What payment methods are accepted for LM36273YFFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM36273YFFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM36273YFFR?
LM36273YFFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM36273YFFR 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 LM36273YFFR?
For technical support, including LM36273YFFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM36273YFFR requirements.
6.How does Aetrix verify that LM36273YFFR is sourced from the original manufacturer or authorized distributors?
All LM36273YFFR 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 LM36273YFFR meets industry standards.
7.What is the process for return or replacement of LM36273YFFR?
All LM36273YFFR units undergo pre-shipment inspection (PSI). If there is an issue with LM36273YFFR, 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 LM36273YFFR part is unused and in its original packaging.
Return procedure for LM36273YFFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM36273YFFR Tags
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