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Texas Instruments LM3697YFQR
- Part No.:
- LM3697YFQR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3697YFQR.pdf
- Description:
- IC LED DRIVER RGLTR 30MA 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,102
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Product details
Overview
LM3697YFQR from Texas Instruments is a high-efficiency, three-string white LED driver IC with integrated 1-A/40-V boost MOSFET, supporting up to 40-V output voltage, 90% peak efficiency, and 11-bit I²C-configurable dimming resolution. It delivers up to 30 mA per string for smartphone display and keypad backlighting under 2.7–5.5 V input.
For engineers reviewing the LM3697YFQR datasheet, LM3697YFQR pinout, LM3697YFQR application, or LM3697YFQR equivalent, key selection criteria include adaptive headroom control across HVLED strings, selectable 500-kHz/1-MHz switching frequency, four programmable OVP thresholds (16/24/32/40 V), thermal shutdown at 140°C, and I²C-compatible configuration of current sink grouping and brightness mapping.
Technical Context
The LM3697YFQR implements an adaptive boost architecture that regulates the minimum of HVLED1/HVLED2/HVLED3 feedback voltages to maintain VHR_MIN (190–400 mV), minimizing power loss in current sinks. Its dual-frequency switching (500 kHz or 1 MHz) is selected via register bit or auto-shifted based on brightness code threshold to optimize conduction vs. switching losses.
Three independent high-voltage current sinks support configurable bank assignment (A/B), 5-bit full-scale current selection (up to 30 mA), and 11-bit exponential or linear dimming. PWM input (2–100 kHz) feeds an internal low-pass filter to generate analog current scaling, enabling content-adjustable backlight control (CABC) without MCU intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and USB-powered systems without external LDO. |
| Max Output Voltage | 40 V - enables driving up to 12-series white LEDs (3.3 V VF each) in three parallel strings. |
| Peak Efficiency | 90% - achieved at mid-load with 22 µH inductor and 1 MHz switching, reducing thermal load in compact handsets. |
| LED Current per String | Up to 30 mA - configurable in 5-bit steps; matching ±2.5% (max) ensures uniform brightness across strings. |
| Dimming Resolution | 11-bit - provides 2048-step granularity for smooth, flicker-free brightness transitions in ambient light adaptation. |
| OVP Thresholds | 16 V / 24 V / 32 V / 40 V - selectable via register to match LED string count and prevent overvoltage stress during open-circuit faults. |
| Thermal Shutdown | 140°C (typical) with 15°C hysteresis - protects die integrity during sustained high-current operation in sealed enclosures. |
Pinout & Package
LM3697YFQR uses a 12-pin DSBGA package (1.64 mm × 1.29 mm, 0.4-mm pitch) optimized for ultra-compact mobile backlight solutions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 PWM | PWM brightness control input | Accepts 2–100 kHz logic-level signal; internally filtered to scale LED current proportionally-enables CABC without firmware overhead. |
| A2 SDA | I²C data line (bidirectional) | Open-drain interface for configuring banks, brightness, OVP, and frequency; requires external pull-up to VIN. |
| A3 HWEN | Hardware enable input | High-impedance active-high enable; pulling low forces shutdown (ISHDN = 3 µA) and resets all registers. |
| B1 HVLED1 | High-voltage current sink 1 | 40-V rated anode connection for first LED string; participates in adaptive headroom regulation when feedback enabled. |
| B2 SCL | I²C clock input | Drives synchronous communication; supports standard/fast-mode timing (t1 ≥ 2.5 µs). |
| B3 IN | Main input supply | Connects to 2.7–5.5 V source; bypassed with ≥2.2 µF ceramic capacitor to suppress input ripple and EMI. |
| C1 HVLED2 | High-voltage current sink 2 | 40-V rated anode for second string; independently assignable to Bank A or B for grouped dimming control. |
| C2 GND | Ground reference | Dual ground pins (C2, C3) reduce impedance and improve current-sink matching and thermal performance. |
| C3 GND | Ground reference | Second ground terminal-must be connected to PCB ground plane with low-inductance path. |
| D1 HVLED3 | High-voltage current sink 3 | 40-V rated anode for third string; supports open/short fault detection when feedback bits are configured. |
| D2 OVP | Overvoltage sense input | Monitors boost output (COUT+) to trigger shutdown if voltage exceeds programmed threshold (e.g., 40 V). |
| D3 SW | Internal MOSFET drain output | Connects to inductor and Schottky diode anode; switches at 500 kHz or 1 MHz with RDS(on) = 0.3 Ω (25°C). |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Headroom Control | Maintains minimal VHR_MIN (190–400 mV) across HVLED strings by regulating to the highest forward voltage-reducing power dissipation up to 15% vs fixed-headroom designs. |
| Auto-Frequency Switching | Shifts between 500 kHz (low-brightness) and 1 MHz (high-brightness) based on 8-bit brightness code threshold-improves LED efficiency by up to 6% in 3p5s configurations. |
| Configurable LED Grouping | Assigns HVLED1–HVLED3 to Bank A or B via register; enables independent dimming of display vs keypad strings using separate 11-bit brightness registers. |
| Integrated 1-A/40-V MOSFET | Eliminates external switch and reduces solution size to 29 mm²-supports full 30-mA-per-string operation without thermal derating in DSBGA package. |
| Four-Threshold OVP Protection | Selectable 16/24/32/40 V thresholds match common LED string counts (e.g., 4s, 6s, 8s, 12s) and prevent catastrophic failure during open-circuit conditions. |
Applications
| Smartphone Display Backlight | Keypad & Indicator Lighting |
|---|---|
|
Use Scenario: Driving three parallel strings of 5–7 white LEDs behind LCD panels in space-constrained smartphones. IC Role / Device Role / Timing Role: High-voltage boost LED driver with adaptive headroom regulation and I²C-configurable 11-bit dimming. Use Value: Delivers uniform brightness across strings with ±2.5% current matching while maintaining 90% efficiency at 3.6 V input-extending battery life during video playback. |
Use Scenario: Powering discrete indicator LEDs and capacitive keypad backlighting in dual-function UI modules. IC Role / Device Role / Timing Role: Programmable current sink controller with independent bank assignment and PWM-assisted CABC. Use Value: Enables simultaneous dimming of display and keypad strings at different brightness levels using separate I²C registers-reducing MCU interrupt load and simplifying UI firmware. |
| Automotive Infotainment Displays | Portable Medical Device UIs |
|
Use Scenario: Backlighting TFT displays in automotive head units operating across −40°C to +85°C ambient range. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown (140°C), wide-input operation (2.7–5.5 V), and fault detection (OVP, short/open LED). Use Value: Ensures reliable operation under cold cranking (2.7 V) and hot engine bay conditions (85°C) while detecting LED string faults before system-level failure. |
Use Scenario: Illuminating critical status indicators and touch-sensitive overlays in battery-powered diagnostic handhelds. IC Role / Device Role / Timing Role: Low-quiescent, high-precision current source with 3 µA shutdown current and 6 µA minimum LED current setting. Use Value: Supports ultra-low-power sleep modes (e.g., <10 µA system standby) while retaining programmable LED readiness-meeting IEC 62304 Class C energy requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage multi-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3630AYFQR | Lacks HVLED capability (max 20 V output); uses dual 20-mA sinks instead of three 30-mA sinks; no OVP threshold selection. | Suitable only for ≤6-series LED strings; requires external OVP circuitry for 40-V systems. | Choose when driving shorter LED strings (<6 LEDs) and board space allows separate protection components. |
| TPS61165DRVR | Single-string driver (no bank grouping); fixed 1.2-MHz switching; no I²C interface-only PWM/dimming pin control. | Requires external multiplexing for multi-string use; lacks per-string fault detection and adaptive headroom. | Prefer for cost-sensitive, single-string applications where software configurability and string independence are not required. |
Compared with LM3630AYFQR and TPS61165DRVR, the LM3697YFQR uniquely integrates triple 40-V current sinks, adaptive headroom, four OVP thresholds, and I²C-based bank control-making it the only option for compact, high-reliability, multi-string smartphone backlighting with programmable fault response.
Availability
LM3697YFQR is available at Aetrix Electronics and suitable for smartphone display backlighting, automotive infotainment UIs, and portable medical device indicators requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LM3697YFQR 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 decades of expertise in precision LED drivers and mobile power solutions.
The LM3697YFQR belongs to TI's high-efficiency backlight driver product line, engineered specifically for space-constrained, battery-powered consumer devices demanding uniform multi-string illumination, adaptive efficiency optimization, and robust fault protection.
FAQ
What is the maximum LED string voltage supported by the LM3697YFQR?
The LM3697YFQR supports up to 40 V at its HVLED1–HVLED3 terminals, enabling drive of up to twelve 3.3-V white LEDs in series per string. This rating is validated under recommended operating conditions (−40°C to +125°C junction temperature) and aligns with its integrated 40-V MOSFET and OVP thresholds up to 40 V. The LM3697YFQR maintains regulation by adapting boost output to the highest string's forward voltage while dropping excess headroom across lower-voltage strings' current sinks.
How does the LM3697YFQR achieve 90% peak efficiency?
The LM3697YFQR achieves 90% peak efficiency through adaptive headroom control (minimizing VHR to 190–400 mV), low-RDS(on) (0.3 Ω) integrated MOSFET, and selectable 500-kHz/1-MHz switching optimized for load conditions. Efficiency curves confirm this value at 3.6 V input with 22 µH inductor and three-string 3p5s configuration. The auto-frequency mode further improves real-world efficiency by shifting to 500 kHz at low brightness-reducing switching losses where conduction dominates.
Can the LM3697YFQR drive LED strings with mismatched forward voltages?
Yes-the LM3697YFQR is explicitly designed for mismatched strings. Its adaptive boost architecture regulates the minimum of HVLED1/HVLED2/HVLED3 to VHR_MIN, allowing the highest-voltage string to set the boost output while the lower-voltage strings drop excess voltage across their current sinks. This preserves per-string current accuracy (±2.5% matching) and avoids overvoltage stress, unlike fixed-output boost drivers that require string balancing resistors or external regulators.
What is the role of the OVP pin on the LM3697YFQR?
The OVP pin on the LM3697YFQR senses the boost converter's output capacitor (COUT) voltage and triggers shutdown if it exceeds one of four programmable thresholds (16/24/32/40 V). This protects downstream LEDs and the IC itself during open-circuit faults or excessive string count. The threshold is selected via register bits, and hysteresis (1 V typical) prevents oscillation near trip point. Unlike passive clamping, this active OVP responds within microseconds and resets automatically after fault clearance.
Does the LM3697YFQR support both linear and exponential dimming curves?
Yes-the LM3697YFQR supports both linear and exponential dimming mapping via I²C register configuration. Exponential mapping provides finer brightness control at low codes (e.g., 0–10% luminance), improving perceived uniformity in dark environments, while linear mapping offers direct proportional response. The 11-bit resolution (2048 steps) applies to both modes, and bank-specific selection allows display (exponential) and keypad (linear) strings to coexist on the same LM3697YFQR device.
LM3697YFQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, 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):
- 5.5V
- Voltage - Output:
- 40V
- Current - Output / Channel:
- 30mA
- Frequency:
- 500kHz, 1MHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA (1.64x1.24)
LM3697YFQR FAQ
1.How can I place an order for LM3697YFQR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3697YFQR 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 LM3697YFQR reliable?
The price and inventory of LM3697YFQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3697YFQR is usually 5 days.
3.What payment methods are accepted for LM3697YFQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3697YFQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3697YFQR?
LM3697YFQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3697YFQR 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 LM3697YFQR?
For technical support, including LM3697YFQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3697YFQR requirements.
6.How does Aetrix verify that LM3697YFQR is sourced from the original manufacturer or authorized distributors?
All LM3697YFQR 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 LM3697YFQR meets industry standards.
7.What is the process for return or replacement of LM3697YFQR?
All LM3697YFQR units undergo pre-shipment inspection (PSI). If there is an issue with LM3697YFQR, 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 LM3697YFQR part is unused and in its original packaging.
Return procedure for LM3697YFQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM3697YFQR Tags
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