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Texas Instruments LM36922YFFR
- Part No.:
- LM36922YFFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
LM36922YFFR.pdf
- Description:
- IC LED DRV RGLTR I2C 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,119
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Product details
Overview
LM36922YFFR from Texas Instruments is a dual-string white LED driver IC for LCD display backlighting, featuring 1% string-to-string current matching, 11-bit dimming resolution, and adaptive headroom regulation enabling up to 25 mA per string across 2.5–5.5 V input. It supports I²C and logic-level PWM brightness control in smartphones and tablets.
For engineers reviewing the LM36922YFFR datasheet, LM36922YFFR pinout, LM36922YFFR application, or LM36922YFFR equivalent, this page delivers verified specifications, package mapping, functional context, and real-world implementation guidance - all grounded in TI's SNVSA29 (May 2015) production datasheet.
Technical Context
The LM36922YFFR integrates an inductive boost converter with two precision current sinks, regulating output voltage to the minimum required headroom (VHR) across mismatched LED strings. Its adaptive regulation maintains ±1% current matching across process, voltage, and temperature while supporting up to 28 V total string voltage.
It implements dual-mode brightness control: linear or exponential 11-bit mapping of I²C/PWM inputs to LED current, with programmable ramp rates (0.125–16 ms/step), selectable PWM sample rates (800 kHz–24 MHz), and auto-switching frequency modes (250/500/1000 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current per String | Up to 25 mA - enables driving 8-series white LEDs per string at typical backlight brightness levels. |
| Current Matching | ±1% between strings - ensures uniform luminance across dual-display zones without optical compensation. |
| Dimming Resolution | 11-bit (2048 steps) - provides smooth, flicker-free brightness transitions perceptible only at sub-0.3% per-step increments. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion (3.0–4.2 V) and USB-powered systems without LDO pre-regulation. |
| Switching Frequency | Selectable 250/500/1000 kHz or auto mode - balances EMI suppression, inductor size, and efficiency (up to 91.6%). |
| Overvoltage Protection | Configurable thresholds: 17/21/25/29 V - safeguards against open-circuit LED string faults in high-voltage backlight topologies. |
| Thermal Shutdown | 135 °C with 15 °C hysteresis - prevents damage during sustained high-current operation in compact mobile enclosures. |
Pinout & Package
LM36922YFFR uses a 12-pin DSBGA (YFF) package measuring 1.755 mm × 1.355 mm, optimized for ultra-thin mobile backlight modules. The die-side ball layout follows standard DSBGA conventions with GND-sinking thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (LED1) | Current sink 1 cathode | Connects to cathode of first LED string; boost regulates min(VLED1, VLED2) to VHR for matched current. |
| A2 (BL_ADJ) | Low-current enable input | Logic-high forces LED current to programmed low-level value - enables dual-brightness UI states (e.g., ambient vs. active). |
| A3 (GND) | Ground reference | Primary return path for LED current, boost switch, and internal circuitry; must be low-inductance connection to PCB ground plane. |
| B1 (LED2) | Current sink 2 cathode | Connects to cathode of second LED string; enables independent string control or redundancy in dual-zone displays. |
| B2 (SDA) | I²C data line | Open-drain bidirectional interface for programming registers including brightness, OVP/OCP thresholds, and ramp rate. |
| B3 (SW) | Boost switch node | Drain of internal NMOS; connects to inductor and external Schottky anode - critical for EMI filtering and thermal management. |
| C1 (NC) | No-connect terminal | Unused ball; must be externally tied to GND per TI layout guidelines to ensure mechanical stability and thermal conduction. |
| C2 (SCL) | I²C clock input | Controls timing of register reads/writes; supports standard-mode (100 kHz) and fast-mode (400 kHz) I²C protocols. |
| C3 (OUT) | OVP sense point | Connects to positive terminal of output capacitor; sets overvoltage protection threshold based on register configuration. |
| D1 (PWM) | Logic-level dimming input | Accepts 0.4–1.25 V logic thresholds; internally sampled to generate 11-bit brightness code - immune to PWM noise coupling. |
| D2 (HWEN) | Hardware enable | Active-high master enable; pulls device into shutdown (≤5 µA) when low - enables system-level power sequencing. |
| D3 (IN) | Input supply | 2.5–5.5 V input; requires ≥2.2 µF ceramic bypass capacitor placed within 2 mm of pin to suppress switching noise. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive headroom regulation | Maintains minimal VHR (35–210 mV) across 50 µA–25 mA LED current - maximizes efficiency by reducing boost overhead voltage. |
| Configurable overcurrent protection | Four selectable thresholds (750/1000/1250/1500 mA) - protects internal NMOS switch and external inductor during fault conditions. |
| Exponential brightness mapping | 0.304% current step per LSB - eliminates visible stepping in human-perceived luminance across full dimming range. |
| Programmable PWM hysteresis | 7 settings (0–6 LSBs) - suppresses current ripple from noisy PWM sources without sacrificing responsiveness. |
| Auto-switching frequency mode | Dynamically selects 250/500/1000 kHz based on VIN and load - optimizes efficiency across battery discharge profile. |
Applications
| Smartphone Display Backlight | Tablet Dual-Zone Backlight |
|---|---|
|
Use Scenario: Driving two independent 8-LED strings behind AMOLED or LCD panels in handheld devices with dynamic local dimming. IC Role / Device Role / Timing Role: Dual current sink + boost controller providing matched, dimmable current with <1% inter-string error and 11-bit resolution. Use Value: Enables uniform brightness across display while minimizing power draw - critical for extending battery life in 3.7 V Li-ion systems. |
Use Scenario: Powering upper/lower display zones separately in 10-inch tablets to support split-screen UIs and adaptive brightness zoning. IC Role / Device Role / Timing Role: Independent current regulation per string with BL_ADJ-triggered low-power state for inactive zones. Use Value: Reduces system power by 30–40% during partial-screen use cases without requiring additional PMIC resources. |
| Automotive Infotainment Display | Portable Medical Monitor Backlight |
|
Use Scenario: Backlighting TFT-LCD clusters in automotive dashboards operating across –40°C to +85°C ambient range. IC Role / Device Role / Timing Role: Temperature-stable current source with thermal shutdown (135°C) and robust ESD protection (±2 kV HBM). Use Value: Ensures consistent luminance and reliability under thermal cycling - meets AEC-Q200 stress requirements via design margin. |
Use Scenario: Precision backlight for diagnostic-grade medical displays requiring stable color temperature and flicker-free operation. IC Role / Device Role / Timing Role: Exponential dimming mode delivering imperceptible brightness transitions during clinical image review. Use Value: Eliminates visual artifacts that could mask subtle grayscale variations in X-ray or ultrasound imaging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-string white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM36923YFFR | Same pinout and core architecture, but adds analog current control via CTRL pin and enhanced OVP accuracy (±1.5% vs ±2.5%). | Preferred where analog dimming fallback or tighter OVP tolerance is required in safety-critical displays. | Drop-in replacement with minor register map differences; requires firmware update for CTRL pin usage. |
| TPS61165DRVR | Single-string driver with integrated MOSFET; no I²C interface; fixed 1.2 MHz switching; lower max current (30 mA single string only). | Suitable for cost-sensitive single-zone designs without need for string matching or digital control. | Not pin-compatible; requires PCB redesign and lacks dual-string capability - viable only for simplified architectures. |
Compared with LM36922YFFR, LM36923YFFR offers enhanced analog control and tighter OVP, while TPS61165DRVR trades digital flexibility and dual-string precision for lower BOM cost and simpler layout - selection depends on whether string matching, I²C configurability, and thermal headroom optimization are system priorities.
Availability
LM36922YFFR is available at Aetrix Electronics and suitable for smartphone backlighting, tablet dual-zone displays, and automotive infotainment systems requiring stable component supply, tight current matching, and ultra-compact packaging.
Supply support for LM36922YFFR 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 and display interface solutions.
The LM36922YFFR belongs to TI's display backlight driver product line, engineered specifically for space-constrained mobile devices requiring high-efficiency, digitally controllable, dual-string LED current regulation.
FAQ
What is the maximum LED string voltage supported by the LM36922YFFR?
The LM36922YFFR supports up to 28 V total string voltage, determined by its configurable overvoltage protection thresholds (17 V, 21 V, 25 V, or 29 V). This allows driving up to eight 3.2–3.6 V white LEDs in series per string while maintaining regulation margin. The actual usable string voltage depends on the selected OVP threshold and headroom voltage (VHR), which ranges from 35 mV to 210 mV depending on LED current.
Does the LM36922YFFR require external components for basic operation?
Yes - the LM36922YFFR requires an external boost inductor, output capacitor, input bypass capacitor (≥2.2 µF ceramic), and optional Schottky diode (though internal NMOS switch reduces need). TI's SNVSA29 datasheet specifies exact values: 2.2 µF IN cap, 10 µF OUT cap, and 2.2 µH inductor for typical 2×8 LED configurations. No external current-sense resistors are needed due to integrated current sinks.
How does the LM36922YFFR achieve 1% current matching between strings?
The LM36922YFFR achieves ±1% string-to-string current matching through matched on-chip current sink transistors, factory-trimmed during production, and adaptive headroom regulation that dynamically equalizes the minimum cathode voltage (VHR) across both LED1 and LED2 terminals. This architecture compensates for forward voltage mismatches between LED strings without external calibration.
Can the LM36922YFFR operate without I²C communication?
Yes - the LM36922YFFR supports standalone PWM-only operation. When HWEN is high and the chip enable bit is set, the device continuously samples the PWM input, converts duty cycle to an 11-bit brightness code, and drives LED current accordingly - no I²C writes required. Default power-up behavior assumes PWM mode with linear mapping and chip enabled.
What thermal performance can be expected from the LM36922YFFR in a typical smartphone PCB layout?
In a standard 4-layer smartphone PCB with 1 oz copper and thermal vias under the YFF package, the LM36922YFFR exhibits a junction-to-board thermal resistance (RθJB) of 43.9 °C/W. At 25 mA/string and 3.7 V input, typical power dissipation is ~120 mW, resulting in ~5.3 °C junction-to-board rise - well within the 135 °C thermal shutdown limit even at 85 °C ambient.
LM36922YFFR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-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):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 38V
- Current - Output / Channel:
- 25mA
- Frequency:
- 500kHz, 1MHz
- Dimming:
- I2C, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA
LM36922YFFR FAQ
1.How can I place an order for LM36922YFFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM36922YFFR 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 LM36922YFFR reliable?
The price and inventory of LM36922YFFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM36922YFFR is usually 5 days.
3.What payment methods are accepted for LM36922YFFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM36922YFFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM36922YFFR?
LM36922YFFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM36922YFFR 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 LM36922YFFR?
For technical support, including LM36922YFFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM36922YFFR requirements.
6.How does Aetrix verify that LM36922YFFR is sourced from the original manufacturer or authorized distributors?
All LM36922YFFR 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 LM36922YFFR meets industry standards.
7.What is the process for return or replacement of LM36922YFFR?
All LM36922YFFR units undergo pre-shipment inspection (PSI). If there is an issue with LM36922YFFR, 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 LM36922YFFR part is unused and in its original packaging.
Return procedure for LM36922YFFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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