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Texas Instruments LM3699YFQR
- Part No.:
- LM3699YFQR
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3699YFQR.pdf
- Description:
- IC LED DRVR RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,969
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Product details
Overview
LM3699YFQR from Texas Instruments is a three-string, high-efficiency, PWM-controlled white LED driver IC for smartphone display and keypad backlighting. It integrates a 1-A/40-V NMOS boost switch, delivers up to 20.2 mA per string, supports 2.7–5.5 V input, regulates output up to 24 V, and achieves 90% peak efficiency at 1 MHz switching frequency.
For engineers reviewing the LM3699YFQR datasheet, LM3699YFQR pinout, LM3699YFQR application, or LM3699YFQR equivalent, this page provides verified technical context, real-world current sink matching data, adaptive headroom control behavior, thermal shutdown thresholds, and validated alternative options for mobile LED lighting designs.
Technical Context
The LM3699YFQR uses a fixed-frequency (1 MHz) inductive boost architecture with integrated 1-A/40-V NMOS switch to power three independent high-voltage current sinks (HVLED1–HVLED3), each supporting up to 24 V forward voltage. Output voltage dynamically adapts to the minimum of the three string voltages to minimize headroom loss.
Current regulation is achieved via PWM input filtering and analog conversion, with four user-selectable full-scale settings (15.4/17.0/18.6/20.2 mA) set by IS1/IS0 logic inputs. ILOW enables rapid 95% current reduction for camera flash mode without altering PWM duty cycle.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.7 V to 5.5 V - supports single-cell Li-ion and Li-poly battery operation across full discharge curve. |
| Max Output Voltage | 24 V - enables driving up to six series white LEDs (6s3p) at 3.5 VF each with margin. |
| Full-Scale Current | 20.2 mA per string - highest selectable setting ensures brightness compliance for high-luminance displays. |
| Switching Frequency | 1 MHz - allows compact 10 µH inductor and reduces EMI compared to lower-frequency boost converters. |
| Current Matching | ±2.5% between HVLED strings - ensures uniform luminance across multi-string backlight panels. |
| Headroom Voltage | 190 mV min at 95% load - minimizes power loss in current sinks and improves overall system efficiency. |
| OVP Threshold | 24 V with 1 V hysteresis - protects against overvoltage during open-circuit or string-failure conditions. |
| Thermal Shutdown | 140°C activation / 125°C release - prevents permanent damage during sustained high-power operation. |
Pinout & Package
LM3699YFQR is housed in a 12-terminal DSBGA package (1.64 mm × 1.29 mm, 0.4 mm pitch), optimized for ultra-thin mobile PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PWM (A1) | Pulse-width modulation input | High-impedance control interface; filters internal LPF to set average LED current; requires ≥0.75 µs pulse width. |
| IS0 (A2) | Current scale select bit 0 | Static digital input; selects full-scale current with IS1; connects directly to IN or GND-no pull resistors needed. |
| HWEN (A3) | Hardware enable | Global device enable; high = active, low = shutdown; draws ≤3 µA in shutdown state. |
| HVLED1 (B1) | High-voltage current sink 1 | Sinks up to 20.2 mA at up to 24 V; regulated headroom voltage minimizes power dissipation. |
| IS1 (B2) | Current scale select bit 1 | Paired with IS0 to configure one of four factory-trimmed full-scale currents (15.4–20.2 mA). |
| IN (B3) | Input voltage supply | Requires ≥2.2 µF ceramic bypass capacitor to GND; supports 2.7–5.5 V with <100 mV ripple tolerance. |
| HVLED2 (C1) | High-voltage current sink 2 | Independent sink with matched regulation to HVLED1/HVLED3; ±2.5% matching ensures display uniformity. |
| ILOW (C2) | Quick-dimming enable | Drives high = ~5% current reduction; used for instantaneous backlight dimming during camera capture. |
| GND (C3) | Power ground | Primary return path for boost inductor current, LED sink current, and internal circuitry; must be low-impedance. |
| HVLED3 (D1) | High-voltage current sink 3 | Third independent sink; all three share adaptive VHR regulation to minimize total power loss. |
| OVP (D2) | Overvoltage protection sense | Monitors boost output capacitor anode; triggers shutdown if voltage exceeds 24 V threshold. |
| SW (D3) | Internal switch drain | Connects to inductor and Schottky diode anode; switches at 1 MHz with 0.3 Ω typical RDS(on). |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Boost Output Regulation | Automatically tracks minimum HVLED string voltage to reduce headroom loss and improve efficiency by up to 5% vs fixed-output boost. |
| Four-Step Full-Scale Current Selection | Hardware-configurable (IS1/IS0) current settings eliminate need for external DAC or I²C interface in cost-sensitive handset designs. |
| Quick-Dimming via ILOW Terminal | Reduces LED current to ~5% in <10 µs-enables seamless transition to camera flash mode without visible flicker or PWM reconfiguration. |
| Integrated 1-A/40-V NMOS Switch | Eliminates external MOSFET and gate driver; reduces BOM count and PCB area while maintaining 90% peak efficiency. |
| 29-mm² Total Solution Size | Includes 10 µH inductor, 1 µF COUT, 2.2 µF CIN, and Schottky diode-fits within tight bezel constraints of modern smartphones. |
| Robust Protection Suite | Includes overvoltage (24 V OVP), overcurrent (880 mA peak limit), and thermal shutdown (140°C) with automatic recovery. |
Applications
| Smartphone Display Backlight | Smartphone Keypad Illumination |
|---|---|
|
Use Scenario: Driving 6-series × 3-parallel white LED arrays in OLED/LCD smartphone displays requiring uniform brightness and dynamic dimming. IC Role / Device Role / Timing Role: Three-channel constant-current sink with adaptive boost output voltage regulation and PWM-based brightness control. Use Value: Achieves >85% efficiency at 20.2 mA/string with 2.7–5.5 V input, minimizing battery drain during extended screen-on time. |
Use Scenario: Illuminating capacitive or mechanical keypads in low-light conditions with precise, flicker-free dimming control. IC Role / Device Role / Timing Role: Low-noise, high-PSRR current source delivering stable 15.4–20.2 mA per string under varying battery voltage. Use Value: Enables smooth 0–100% brightness ramping using standard 2–100 kHz PWM signals without audible noise or current overshoot. |
| Camera Flash Auxiliary Lighting | Portable Medical Device UI Lighting |
|
Use Scenario: Providing instant backlight dimming during camera flash capture to prevent image washout and preserve ambient light perception. IC Role / Device Role / Timing Role: Fast-response current sink controlled by ILOW signal to reduce LED current to ~5% within microseconds. Use Value: Eliminates need for separate flash-control circuitry; maintains same LED strings for both UI and flash-assist functions. |
Use Scenario: Powering high-reliability indicator LEDs and status backlights in handheld diagnostic tools operating across −40°C to +85°C. IC Role / Device Role / Timing Role: Thermally robust LED driver with built-in 140°C shutdown and ±2.5% current matching for consistent visual feedback. Use Value: Ensures regulatory compliance for medical-grade luminance stability and eliminates field failures due to thermal runaway. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar white LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM3630AYFQR | Two-string driver; 1.2-MHz switching; 18.5-mA max per string; no ILOW pin; smaller 9-ball DSBGA. | Limited to dual-string configurations; lacks quick-dimming capability; lower max current reduces brightness headroom. | Select when only two LED strings are required and camera flash dimming is not needed-reduces cost and footprint. |
| TPS61165DRVR | Single-string boost LED driver; 1.2-MHz switching; 30-mA max output; external MOSFET; no integrated current sinks. | Requires external current-setting resistor and MOSFET; supports higher per-string current but adds complexity and layout area. | Choose for higher-current single-string applications where programmability and thermal flexibility outweigh integration benefits. |
Compared with LM3699YFQR, LM3630AYFQR offers reduced channel count and no ILOW functionality but saves board space, while TPS61165DRVR trades integration for higher single-string current and external component control-neither is pin-compatible, and both require layout changes.
Availability
LM3699YFQR is available at Aetrix Electronics and suitable for smartphone display backlighting, keypad illumination, portable medical device UIs, and camera-assist lighting requiring stable component supply and long-term production continuity.
Supply support for LM3699YFQR 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 over 50 years of innovation in energy-efficient IC design.
The LM3699YFQR belongs to TI's mobile LED driver product line, engineered specifically for ultra-thin, battery-powered handsets requiring high-efficiency, multi-string backlight control with minimal external components.
FAQ
What is the maximum LED string voltage supported by the LM3699YFQR?
The LM3699YFQR supports up to 24 V on each HVLED terminal, enabling configurations such as six series white LEDs (6s3p) assuming 3.5 V forward voltage per LED. The boost output automatically adjusts to the lowest string voltage to minimize headroom loss, and the OVP circuit triggers at 24 V with 1 V hysteresis to protect against overvoltage events. This rating is confirmed in the Absolute Maximum Ratings table and validated across temperature ranges.
How does the ILOW function operate in the LM3699YFQR?
The ILOW terminal on the LM3699YFQR provides hardware-level fast dimming: when driven high, it reduces LED current to approximately 5% of the full-scale value within microseconds, independent of the PWM input duty cycle. This enables immediate backlight dimming during camera flash capture. If unused, ILOW must be tied to GND. Its behavior is specified in Section 7.3.4 and confirmed in Electrical Characteristics with 95% current reduction.
What are the four full-scale current settings available on the LM3699YFQR?
The LM3699YFQR offers four factory-trimmed full-scale current settings selected via IS1 and IS0 logic inputs: 15.4 mA (IS1=0, IS0=0), 17.0 mA (IS1=0, IS0=1), 18.6 mA (IS1=1, IS0=0), and 20.2 mA (IS1=1, IS0=1). These values are measured at TA = 25°C with VIN = 3.6 V and PWM = 100%, and are listed in Table 1 of the datasheet with ±2.5% tolerance across operating conditions.
Does the LM3699YFQR require external compensation components?
No, the LM3699YFQR uses an internally compensated boost controller and requires no external compensation network. Its fixed 1-MHz switching frequency and integrated current-mode control eliminate the need for loop compensation components. The recommended external components-10 µH inductor, 1 µF COUT, 2.2 µF CIN, and Schottky diode-are for power stage implementation only, as specified in Section 8.2.2.
What thermal protection features does the LM3699YFQR include?
The LM3699YFQR incorporates thermal shutdown protection that disables the boost converter and all HVLED current sinks when junction temperature reaches 140°C (typical), and re-enables operation once temperature falls to 125°C (typical). This hysteresis prevents thermal cycling, and the feature is implemented entirely on-die with no external components required-verified in Section 6.3 and 7.3.5 of the datasheet.
LM3699YFQR 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:
- -
- Current - Output / Channel:
- 20.2mA
- Frequency:
- 1MHz
- Dimming:
- PWM
- Applications:
- Backlight, Camera Flash
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA (1.64x1.24)
LM3699YFQR FAQ
1.How can I place an order for LM3699YFQR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3699YFQR 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 LM3699YFQR reliable?
The price and inventory of LM3699YFQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3699YFQR is usually 5 days.
3.What payment methods are accepted for LM3699YFQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3699YFQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3699YFQR?
LM3699YFQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3699YFQR 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 LM3699YFQR?
For technical support, including LM3699YFQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3699YFQR requirements.
6.How does Aetrix verify that LM3699YFQR is sourced from the original manufacturer or authorized distributors?
All LM3699YFQR 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 LM3699YFQR meets industry standards.
7.What is the process for return or replacement of LM3699YFQR?
All LM3699YFQR units undergo pre-shipment inspection (PSI). If there is an issue with LM3699YFQR, 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 LM3699YFQR part is unused and in its original packaging.
Return procedure for LM3699YFQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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