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Texas Instruments LM36922HYFFR
- Part No.:
- LM36922HYFFR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
LM36922HYFFR.pdf
- Description:
- IC LED DRV RGLTR I2C 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,523
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Product details
Overview
LM36922HYFFR from Texas Instruments is a dual-string white LED driver IC for LCD backlighting, featuring 1% string-to-string current matching, 11-bit dimming resolution, and up to 38 V output capability at 25 mA per string. It operates from 2.5 V to 5.5 V input and supports I²C programming and logic-level PWM control in smartphones and tablets.
For engineers reviewing the LM36922HYFFR datasheet, LM36922HYFFR pinout, LM36922HYFFR application, or LM36922HYFFR equivalent, this page delivers verified electrical specs, DSBGA-12 package details, thermal performance data, OVP/OCP configuration options, and real-world backlighting use cases - all grounded in TI's SNVSAF2A production datasheet.
Technical Context
The LM36922HYFFR integrates an inductive boost converter with two precision current sinks, regulating LED strings via adaptive headroom control (VHR = 35–210 mV) to maintain accuracy across voltage/temperature. Its auto-switching frequency mode dynamically selects 250 kHz / 500 kHz / 1 MHz based on load current to maximize efficiency.
It implements sampled PWM dimming with configurable sample rates (800 kHz / 4 MHz / 24 MHz), hysteresis settings (0–6 LSB), and timeout thresholds (0.6–25 ms), eliminating noise-induced current ripple. I²C interface supports dual address selection (0x36 / 0x37) via ASEL pin and full register-based brightness mapping (linear or exponential).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED Current Accuracy | ±3% across process/voltage/temperature - ensures consistent brightness without calibration. |
| String Matching | ±1% worst-case between LED1/LED2 - enables uniform luminance in dual-string LCD panels. |
| Dimming Resolution | 11-bit (2048 steps) - provides smooth, imperceptible brightness transitions in display backlighting. |
| OVP Thresholds | Selectable 17 V / 24 V / 31 V / 38 V - protects against overvoltage in varied LED stack configurations. |
| OCP Thresholds | Configurable 750 / 1000 / 1250 / 1500 mA - allows safe operation with different inductor/switch designs. |
| Switching Frequency | 250 kHz / 500 kHz / 1 MHz (auto or fixed) - balances EMI, efficiency, and component size. |
| Input Voltage Range | 2.5 V to 5.5 V - compatible with single-cell Li-ion and USB-powered portable systems. |
Pinout & Package
LM36922HYFFR uses a 12-pin DSBGA package (1.756 mm × 1.355 mm, 0.4 mm pitch) optimized for ultra-compact mobile backlight designs. Thermal resistance RθJA = 88.9°C/W enables reliable operation in space-constrained layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LED1 / LED2 | Cathode inputs to matched current sinks | Accept up to 29.5 V cathode voltage; minimum headroom regulated to VHR for accuracy. |
| IN | Main power input | Requires ≥2.2 µF ceramic bypass capacitor; supports 2.5–5.5 V battery or rail supply. |
| SW | Internal NMOS drain / external Schottky anode | Drives boost inductor; RDS(on) = 0.29 Ω enables high-efficiency switching. |
| OUT | OVP sense point | Connects to output capacitor positive terminal; triggers shutdown if >38 V threshold. |
| HWEN | Hardware enable input | Logic-high (>1.25 V) activates device; low forces shutdown (ISHDN = 1.2–5 µA). |
| PWM | Sampled dimming input | Accepts 50 Hz–50 kHz logic-level signal; internally converts duty cycle to 11-bit brightness code. |
| SDA / SCL | I²C bidirectional data / clock | Supports standard-mode I²C (t1 ≥ 2.5 µs); address selectable via ASEL pin. |
| ASEL | I²C address select | GND = 0x36, high = 0x37 - enables multiple devices on same bus without conflict. |
| GND | Power and signal reference | Must be low-impedance connection; critical for current sink accuracy and thermal performance. |
| VIO | I/O supply reference | Accepts 1.65–5.5 V; decouples logic interface from analog supply for noise immunity. |
| NC | No-connect | Internally unused; must be externally tied to GND per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive headroom regulation (VHR) | Adjusts 35–210 mV based on LED current - minimizes power loss while preserving ±1% matching. |
| Auto-frequency switching | Dynamically selects 250/500/1000 kHz - optimizes efficiency across 50 µA–25 mA load range. |
| Sampled PWM dimming | Eliminates ripple/noise coupling - enables clean, flicker-free dimming even with noisy MCU PWM. |
| Configurable OVP/OCP thresholds | Four user-selectable levels per protection type - simplifies design reuse across LED count variants. |
| Thermal shutdown | Triggers at 135°C with 15°C hysteresis - prevents damage during sustained overload or poor heatsinking. |
| Exponential brightness mapping | 0.304% step size per code - delivers perceptually linear luminance response for human vision. |
Applications
| Smartphone Backlight | Tablet LCD Panel |
|---|---|
|
Use Scenario: Driving dual 8-LED strings (16 total) in a 5.5-inch AMOLED-compatible LCD with dynamic contrast control. IC Role / Device Role / Timing Role: Dual-current-sink LED driver with I²C-configured brightness ramping and auto-frequency boost control. Use Value: Delivers 1% string matching and 11-bit dimming to eliminate visible banding during video playback and UI transitions. |
Use Scenario: Powering 2×12 LED strings (24 total) in a 10.1-inch tablet display with variable ambient light adaptation. IC Role / Device Role / Timing Role: High-voltage (up to 38 V) boost + current regulation IC with PWM-triggered fast startup (≤5 ms). Use Value: Enables seamless brightness scaling from 1 cd/m² to 500 cd/m² using exponential mapping without perceptible stepping. |
| Automotive Infotainment Display | Portable Medical Monitor |
|
Use Scenario: Backlighting a 7-inch automotive cluster display operating across –40°C to +85°C ambient range. IC Role / Device Role / Timing Role: Automotive-grade LED driver with thermal shutdown, OVP, and robust ESD tolerance (±2000 V HBM). Use Value: Maintains ±3% current accuracy over full temperature range - ensures consistent readability under extreme cabin conditions. |
Use Scenario: Illuminating a high-reliability diagnostic monitor requiring flicker-free, low-noise backlighting for clinical image review. IC Role / Device Role / Timing Role: Low-noise sampled-PWM LED controller with glitch-filtered inputs and stable 86–90% efficiency. Use Value: Eliminates PWM-induced EMI that could interfere with sensitive analog sensor signals in adjacent circuitry. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM36923YFFR | Same DSBGA-12 package, adds integrated NTC thermistor interface and enhanced fault reporting registers. | Required where closed-loop temperature compensation of LED brightness is needed (e.g., outdoor kiosks). | Choose LM36923YFFR when thermal derating or ambient-compensated dimming is mandatory; otherwise LM36922HYFFR suffices. |
| TPS61165DRVR | Single-string driver (not dual), fixed 1.2-MHz switching, no I²C, only PWM dimming; SOIC-8 package (larger footprint). | Suitable for cost-sensitive single-string designs where space and advanced control are secondary. | Select TPS61165DRVR only for simplified, lower-BOM-cost single-string applications - not a functional replacement for dual-string needs. |
Compared with LM36923YFFR, LM36922HYFFR omits thermal sensing but offers identical core LED driving performance and smaller footprint; versus TPS61165DRVR, it provides true dual-string matching and programmable OVP/OCP - critical for premium display quality and design flexibility.
Availability
LM36922HYFFR is available at Aetrix Electronics and suitable for smartphone backlighting, tablet LCD panels, and automotive infotainment displays requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM36922HYFFR 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 LM36922HYFFR belongs to TI's display backlight driver product line, engineered specifically for high-efficiency, high-accuracy dual-string LED control in space-constrained portable and automotive displays.
FAQ
What is the maximum LED string voltage supported by the LM36922HYFFR?
The LM36922HYFFR supports up to 38 V at the OUT pin for overvoltage protection, with LED1/LED2 rated for up to 29.5 V cathode voltage. This enables driving up to 12 series white LEDs per string (assuming ~3 V VF) while maintaining regulation headroom. The actual usable string voltage depends on configured OVP threshold (17 V / 24 V / 31 V / 38 V) and VHR headroom margin.
How does the LM36922HYFFR achieve 1% current matching between LED strings?
The LM36922HYFFR achieves ±1% string-to-string current matching through matched on-chip current sink transistors, precision internal references, and adaptive headroom voltage (VHR) regulation that dynamically adjusts 35–210 mV based on load. This architecture maintains accuracy across –40°C to +85°C, 2.7–5 V input, and 50 µA–25 mA current range - verified in TI's SNVSAF2A datasheet.
Can the LM36922HYFFR operate without I²C communication?
Yes, the LM36922HYFFR supports standalone operation using only the PWM input. Upon HWEN assertion, it enters standby and monitors PWM duty cycle, converting it into an 11-bit brightness code with sampled input filtering. No I²C writes are required for basic dimming - making LM36922HYFFR ideal for resource-constrained microcontrollers or legacy systems lacking I²C hardware.
What are the thermal limitations of the LM36922HYFFR in a DSBGA package?
The LM36922HYFFR in YFF (DSBGA-12) package has RθJA = 88.9°C/W and thermal shutdown at 135°C (15°C hysteresis). At 25 mA/string and 3.7 V input, typical power dissipation is <150 mW. Proper PCB copper area under the package and minimal trace length to GND are essential to maintain junction temperature within limits - especially at max output voltage and ambient >70°C.
How does the auto-frequency mode improve efficiency in the LM36922HYFFR?
The LM36922HYFFR auto-frequency mode selects 250 kHz / 500 kHz / 1 MHz based on real-time load current to minimize switching losses. At light loads (<5 mA), 250 kHz reduces gate charge loss; at medium loads (5–15 mA), 500 kHz balances conduction and switching loss; at heavy loads (>15 mA), 1 MHz shrinks inductor size while maintaining >86% efficiency - all without firmware intervention.
LM36922HYFFR 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
LM36922HYFFR FAQ
1.How can I place an order for LM36922HYFFR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM36922HYFFR 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 LM36922HYFFR reliable?
The price and inventory of LM36922HYFFR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM36922HYFFR is usually 5 days.
3.What payment methods are accepted for LM36922HYFFR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM36922HYFFR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM36922HYFFR?
LM36922HYFFR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM36922HYFFR 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 LM36922HYFFR?
For technical support, including LM36922HYFFR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM36922HYFFR requirements.
6.How does Aetrix verify that LM36922HYFFR is sourced from the original manufacturer or authorized distributors?
All LM36922HYFFR 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 LM36922HYFFR meets industry standards.
7.What is the process for return or replacement of LM36922HYFFR?
All LM36922HYFFR units undergo pre-shipment inspection (PSI). If there is an issue with LM36922HYFFR, 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 LM36922HYFFR part is unused and in its original packaging.
Return procedure for LM36922HYFFR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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