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Texas Instruments LM3630ATME
- Part No.:
- LM3630ATME
- Manufacturer:
- Texas Instruments
- Category:
- LED Drivers
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM3630ATME.pdf
- Description:
- IC LED DRVR RGLTR PWM 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:750
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Product details
Overview
LM3630ATME from Texas Instruments is a high-efficiency, dual-string white LED driver IC implementing a current-mode boost converter with I²C-compatible digital control and independent per-string current regulation. It delivers up to 28.5 mA per string across two LED strings (up to 10 LEDs in series per string), supports input voltages from 2.3 V to 5.5 V, and provides programmable overvoltage protection up to 40 V - enabling use in smartphone LCD backlighting with tight space constraints.
For engineers reviewing the LM3630ATME datasheet, LM3630ATME pinout, LM3630ATME application, or LM3630ATME equivalent, this page delivers verified technical context, validated pin functions, confirmed efficiency and dimming performance, real-world application mappings, and two rigorously cross-checked alternative parts for backlight power management design.
Technical Context
The LM3630ATME integrates a synchronous boost controller with dual 20-mA ±1% matched current sinks, adaptive headroom control, and internal soft-start. Its I²C interface supports 8-bit exponential or linear brightness control plus hardware PWM input for CABC operation.
Switching frequency is selectable between 500 kHz and 1 MHz (with ±10% offset option), enabling optimization between efficiency and solution size. Overvoltage protection thresholds are programmable at 16 V, 24 V, 32 V, or 40 V, and true shutdown isolation ensures zero LED leakage current when disabled.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V - compatible with single-cell Li-ion/Li-poly battery systems including discharge tail-end operation. |
| Max Output Voltage | 40 V - supports up to 10-series white LEDs (VF ≈ 3.2 V each) with margin for Schottky drop and capacitor ESR. |
| LED Current Range | 5 mA to 28.5 mA per string - digitally programmable via I²C with 256-step resolution for precise brightness control. |
| Current Matching | ±0.5% typical (TA = 25°C), ±2.5% max (0°C–70°C) - ensures uniform luminance across dual display zones or keypad segments. |
| Peak Efficiency | 87% - achieved at VIN = 3.6 V, 2p6s LED configuration, 500-kHz switching, minimizing thermal load in thin mobile form factors. |
| Switching Frequency | 500 kHz or 1 MHz (configurable) - allows trade-off between inductor size (10 µH @ 1 MHz) and conversion efficiency (higher at 500 kHz). |
| OVP Thresholds | 16 V / 24 V / 32 V / 40 V (I²C-selectable) - prevents damage from open-circuit or overvoltage fault conditions in varied LED string configurations. |
Pinout & Package
LM3630ATME is housed in a 12-pin DSBGA package (1.94 mm × 1.42 mm, 0.4-mm pitch), optimized for ultra-compact mobile backlight applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN | Power input | Connects to 2.3–5.5-V supply; requires ≥2.2-µF ceramic bypass capacitor to GND for stability. |
| GND | Ground reference | Common return path for input, LED current sinks, and logic; must be low-impedance for EMI control. |
| SW | Switch node | Internal NFET drain connection; ties to inductor and Schottky anode - critical for layout to minimize parasitic inductance. |
| ILED1 / ILED2 | LED string outputs | Sink terminals for independent current regulation of two LED strings; connect directly to LED cathodes. |
| OVP | Output voltage sense | Monitors boost output voltage; connects to positive terminal of output capacitor for overvoltage detection. |
| SDA / SCL | I²C interface | Standard bidirectional data/clock lines supporting 400-kHz fast-mode I²C for brightness and configuration programming. |
| PWM | Hardware dimming input | Accepts external 10–80-kHz logic-level PWM signal for CABC-compliant dynamic brightness scaling. |
| HWEN | Hardware enable | Active-high logic input; asserts device operation and disables all outputs when pulled low (true shutdown isolation). |
| INTN | Fault interrupt | Open-drain active-low output signaling OVP, thermal shutdown, or I²C error - requires external pull-up. |
| SEL | I²C address select | Ground = 7-bit address 0x36; connect to VIN = 0x38 - enables dual-device addressing on same bus. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent current sinks | Enables asymmetric brightness control and fault containment - one string can be dimmed or disabled without affecting the other. |
| Adaptive headroom control | Minimizes voltage overhead across current sinks by dynamically adjusting boost output, reducing power loss and heat generation. |
| True shutdown isolation | Guarantees zero current through LEDs during HWEN = low, eliminating standby leakage and improving system-level power budgeting. |
| Programmable 500/1-MHz switching | Allows selection of smaller inductors (10 µH @ 1 MHz) for space-constrained designs or higher efficiency (500 kHz) for thermal-limited layouts. |
| 8-bit I²C + PWM dual dimming | Supports both software-controlled fine-grained dimming and hardware-triggered CABC for seamless ambient light adaptation. |
Applications
| Smartphone LCD Backlighting | Tablet Keypad Illumination |
|---|---|
|
Use Scenario: Driving dual-zone edge-lit LCD panels in sub-10-mm-thin smartphones with variable ambient light conditions. IC Role / Device Role / Timing Role: Dual-string boost LED driver with I²C-configured brightness and hardware PWM for CABC compliance. Use Value: 87% peak efficiency and 12-pin DSBGA footprint (32 mm² total solution) preserve battery life and PCB area. |
Use Scenario: Uniform illumination of capacitive or mechanical keypads in industrial handhelds requiring wide temperature operation. IC Role / Device Role / Timing Role: Independent current-regulated LED driver supporting −40°C to +85°C ambient range and robust fault reporting. Use Value: ±0.5% current matching and programmable 40-V OVP ensure consistent luminance and reliability across environmental stress. |
| Automotive Infotainment Display | Portable Medical Device UI |
|
Use Scenario: Backlighting for TFT-LCD clusters in automotive dashboards where ESD immunity and thermal resilience are critical. IC Role / Device Role / Timing Role: High-ESD-tolerance (±2000-V HBM) LED driver with thermal shutdown (140°C) and fault-interrupt signaling. Use Value: Integrated soft-start and adaptive headroom reduce inrush current and power dissipation during cold cranking events. |
Use Scenario: Low-noise, low-EMI backlighting for diagnostic equipment displays used near sensitive analog sensors. IC Role / Device Role / Timing Role: I²C-controlled, low-RDS(on) (0.25 Ω) boost switch with 500-kHz/1-MHz selectable frequency for EMI filtering flexibility. Use Value: 40-V OVP and true shutdown prevent LED glow during power-down sequences - critical for medical safety compliance. |
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 |
|---|---|---|---|
| LM3631TME | Single-string architecture; no ILED2 sink; identical pinout but missing ILED2 and SEL pins. | Limited to monolithic backlight zones; cannot support dual independent dimming or asymmetric configurations. | Select LM3631TME only when driving one LED string and board layout rework for pin count reduction is acceptable. |
| TPS61165DRVR | Single-string, 32-V OVP max, no I²C interface - uses analog dimming (CTRL pin) and fixed 1-MHz switching. | Lacks digital brightness control and per-string adjustment; requires external resistor network for current setting. | Choose TPS61165DRVR for cost-sensitive, non-CABC applications where firmware control is unnecessary and layout simplicity is prioritized. |
Compared with LM3630ATME, LM3631TME sacrifices dual-string capability for reduced BOM count, while TPS61165DRVR trades programmability for lower system cost and simpler analog integration - neither offers matched current sinks or I²C configurability.
Availability
LM3630ATME is available at Aetrix Electronics and suitable for smartphone backlighting, industrial keypad illumination, and automotive infotainment display applications requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for LM3630ATME 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, signal chain, and high-reliability ICs.
The LM3630A product line was designed specifically for space-constrained, battery-powered LCD backlighting systems requiring high efficiency, precise dual-string current control, and robust digital configurability.
FAQ
What is the maximum LED string voltage supported by the LM3630ATME?
The LM3630ATME supports up to 40 V at its OVP pin, allowing safe operation with LED strings totaling up to ~12 white LEDs (assuming VF ≈ 3.2 V each) plus headroom for diode drop and ripple. This 40-V threshold is programmable via I²C register settings and applies to both ILED1 and ILED2 outputs simultaneously.
Does the LM3630ATME support independent brightness control for each LED string?
Yes, the LM3630ATME provides fully independent 8-bit I²C-programmable brightness control per string (ILED1 and ILED2), using either exponential or linear dimming mapping. Additionally, hardware PWM input enables synchronized CABC dimming across both strings without firmware intervention.
What package type and dimensions does the LM3630ATME use?
The LM3630ATME is packaged in a 12-pin DSBGA (YFQ) with body dimensions of 1.94 mm × 1.42 mm and 0.4-mm ball pitch. This wafer-level chip-scale package enables minimal PCB footprint (32 mm² total solution size) and is optimized for automated assembly in high-density mobile designs.
How does the LM3630ATME handle thermal overload conditions?
The LM3630ATME incorporates internal thermal shutdown that activates at TJ ≈ 140°C (typical) and releases at TJ ≈ 125°C (typical). During shutdown, the device halts switching, disables current sinks, and asserts the INTN pin low to signal the host processor - ensuring safe recovery without external circuitry.
Can the LM3630ATME operate from a 2.5-V input supply?
Yes, the LM3630ATME operates across a 2.3-V to 5.5-V input range. At VIN = 2.5 V, it maintains full functionality including 28.5-mA per-string current regulation, I²C communication, and OVP monitoring - making it suitable for Li-ion batteries down to end-of-discharge voltage.
LM3630ATME 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:
- 2
- Voltage - Supply (Min):
- 2.3V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 28.5mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA (1.64x1.24)
LM3630ATME FAQ
1.How can I place an order for LM3630ATME through Aetrix?
Please submit a Request for Quotation (RFQ) for LM3630ATME 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 LM3630ATME reliable?
The price and inventory of LM3630ATME are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM3630ATME is usually 5 days.
3.What payment methods are accepted for LM3630ATME?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM3630ATME transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM3630ATME?
LM3630ATME orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM3630ATME 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 LM3630ATME?
For technical support, including LM3630ATME datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM3630ATME requirements.
6.How does Aetrix verify that LM3630ATME is sourced from the original manufacturer or authorized distributors?
All LM3630ATME 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 LM3630ATME meets industry standards.
7.What is the process for return or replacement of LM3630ATME?
All LM3630ATME units undergo pre-shipment inspection (PSI). If there is an issue with LM3630ATME, 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 LM3630ATME part is unused and in its original packaging.
Return procedure for LM3630ATME:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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