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Microchip Technology ATMSL3162BT
- Part No.:
- ATMSL3162BT
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 40-WFQFN Exposed Pad
- Datasheet:
-
ATMSL3162BT.pdf
- Description:
- IC LED DRV OFFL PWM 105MA 40TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,141
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Product details
Overview
ATMSL3162BT from Microchip Technology (formerly Atmel) is a 16-channel, high-efficiency LED string driver IC for LCD backlighting and signage applications. It sinks up to 100mA per string with ±3% current accuracy, supports up to 10 white LEDs per string (40V max), and features adaptive Efficiency Optimizer control, 1MHz I²C/SMBus interface, and per-string PWM phase adjustment for motion blur reduction in TV and monitor backlights.
For engineers reviewing the ATMSL3162BT datasheet, ATMSL3162BT pinout, ATMSL3162BT application, or ATMSL3162BT equivalent, key selection considerations include its 40-pin TQFN package, 6-bit analog + 10-bit PWM dimming, integrated fault monitoring (open/short circuit, over-temperature), user EEPROM for power-up defaults, and support for multi-device bus sharing with 16 slave addresses.
Technical Context
The ATMSL3162BT integrates 16 independent current-sink channels with internal MOSFETs rated for 40V and 100mA peak, each programmable via 6-bit analog current control and combined 10-bit PWM (8-bit string × 6-bit global × 8-bit thermal derating). Its DLL-based synchronization engine accepts PHI (40Hz–10kHz) and GSC (up to 5MHz) inputs to align PWM timing precisely with video frame/line signals.
Three dedicated Efficiency Optimizer feedback loops (FBI1/FBO1 through FBI3/FBO3) dynamically regulate external DC-DC supplies to minimize voltage headroom across all active LED strings; multiple ATMSL3162BT devices can cascade these loops to negotiate a shared minimum supply voltage without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED string count | 16 independent current-sink outputs (STR0–STR15), each supporting up to 10 white LEDs in series |
| Max sink current per string | 100mA - set by external ILED resistor (e.g., 20.5kΩ → 100mA); full-scale range selectable from 28.5mA to 100mA |
| Current accuracy & matching | Better than ±3% absolute accuracy and ±3% inter-string matching at 30mA, enabling uniform brightness in large-area backlights |
| I²C/SMBus speed | 1MHz maximum clock rate - sufficient for frame-by-frame intensity updates across 16 devices (2560 LEDs total) |
| Operating temperature | −40°C to +85°C ambient - qualified for industrial and automotive display environments |
| Supply voltage | VIN = 4.5–5.5V - powers internal 2.5V LDO (VDD) and logic; no external bias required for core operation |
| Fault detection | Dedicated FLTB pin + I²C register reporting for open-circuit, short-circuit, and die over-temperature (135°C cutoff) |
Pinout & Package
ATMSL3162BT is housed in a lead-free, halogen-free, RoHS-compliant 40-pin TQFN package (6mm × 6mm × 0.75mm, 0.5mm pitch) with exposed thermal pad (EP) connected to GND for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| STR0–STR15 | LED string current sink outputs | 16 cathode-side sinks; each drives one series LED string up to 40V/100mA; unused pins must be tied to GND |
| FBI1–FBI3 / FBO1–FBO3 | Efficiency Optimizer feedback I/O | Three independent feedback channels; FBI inputs sense external supply voltage divider; FBO outputs inject current to lower supply output voltage |
| PHI, GSC | Video synchronization inputs | PHI (40Hz–10kHz) locks PWM to frame rate; GSC (≤5MHz) sets PWM resolution; both enable artifact-free dimming aligned to LCD refresh |
| SDA, SCL, AD0, AD1 | I²C interface and address selection | Standard 1MHz I²C bus; AD0/AD1 select one of 16 slave addresses (GND/VDD/SDA/SCL combinations) |
| FLTB | Fault indication output | Open-drain active-low signal asserting on any detected fault (open/short/over-temp); remains low until fault registers are read |
| ILED | Global current reference input | Single external resistor (e.g., 34.8kΩ) sets full-scale sink current for all 16 strings; enables precise, matched current scaling |
Key Features
| Feature | Design Value |
|---|---|
| Adaptive Efficiency Optimizer | Reduces power loss in current sinks by dynamically lowering LED supply voltage to minimum required for regulation across all strings |
| Per-string PWM phase control | Eliminates motion blur in LCD backlights by shifting individual string PWM off-times to match zone-specific refresh timing |
| On-chip user EEPROM | Stores customized register defaults (e.g., current settings, fault masks, PWM configurations) to eliminate re-initialization at power-on |
| Multi-device I²C broadcast mode | Enables simultaneous configuration of up to 16 ATMSL3162BT devices on one bus - critical for large-panel TV backlight systems |
| Thermal derating with OT compensation | Automatically scales PWM intensity based on die temperature using programmable threshold (OTTEMP) and slope (OTSLOPE) registers |
Applications
| TV Backlight Control | Medical Display Backlighting |
|---|---|
Use Scenario: Driving direct-lit LED arrays behind large-format LCD panels in 4K/8K televisions with local dimming zones. IC Role / Device Role / Timing Role: Primary LED string controller managing 160+ white LEDs per chip; synchronizes PWM timing to VSYNC/HSYNC to prevent flicker and motion artifacts. Use Value: Enables >10,000:1 contrast ratio via real-time 2D area dimming while maintaining ±3% brightness uniformity across zones. | Use Scenario: Powering high-reliability, long-life backlighting for diagnostic monitors in MRI/CT control rooms where thermal stability and fault resilience are critical. IC Role / Device Role / Timing Role: Fault-monitored LED driver with open/short detection and over-temperature cutoff; operates continuously within −40°C to +85°C industrial range. Use Value: Ensures uninterrupted display operation via FLTB alerting and I²C-accessible fault registers, reducing risk of clinical workflow interruption. |
| Automotive Infotainment Displays | Digital Signage Backlighting |
Use Scenario: Backlighting high-brightness TFT displays in vehicle dashboards and center consoles under wide ambient temperature swings. IC Role / Device Role / Timing Role: Adaptive current regulator compensating for LED forward-voltage drift across temperature; uses Efficiency Optimizer to maintain efficiency at cold start and hot idle. Use Value: Delivers consistent luminance and color point over −40°C to +85°C without external thermal compensation circuitry. | Use Scenario: Driving modular LED backlight units in outdoor kiosks and retail signage requiring scalable, high-power density illumination. IC Role / Device Role / Timing Role: High-channel-count driver supporting cascaded configurations (up to 16 chips on one I²C bus) for unified control of 2560+ LEDs. Use Value: Reduces system BOM and firmware complexity by eliminating need for multiple controllers or bus repeaters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED string driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLC6983RTQR | 16-channel, 100mA sink; 1.2MHz SPI interface; no built-in Efficiency Optimizer; requires external voltage control loop | Lacks adaptive supply regulation - needs external DAC or DAC-controlled DC-DC for optimal efficiency | Preferred when SPI-native systems exist and supply optimization is handled externally |
| ISL97693IRTZ-T7A | 16-channel, 120mA sink; 400kHz I²C; integrated boost controller; no per-string phase control | Includes on-chip boost converter but lacks motion blur mitigation features and multi-chip negotiation capability | Suitable for space-constrained designs needing integrated power, but not for high-end TV local dimming |
Compared with TLC6983RTQR and ISL97693IRTZ-T7A, the ATMSL3162BT uniquely combines 1MHz I²C, per-string PWM phasing, and autonomous multi-device Efficiency Optimizer negotiation - making it the only option among the three qualified for frame-synchronized, high-dynamic-range LCD backlighting in premium TVs and medical displays.
Availability
ATMSL3162BT is available at Aetrix Electronics and suitable for television backlighting, medical instrumentation displays, and automotive infotainment systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for ATMSL3162BT 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
Microchip Technology acquired Atmel in 2016 and maintains full product support, documentation, and manufacturing continuity for legacy Atmel analog and LED driver portfolios.
The ATMSL3162BT belongs to Microchip's high-performance LED backlight driver family, engineered specifically for LCD and OLED display systems demanding precision current matching, video-synchronized dimming, and adaptive power efficiency in industrial and consumer applications.
FAQ
What is the maximum number of LEDs the ATMSL3162BT can drive per string?
The ATMSL3162BT supports up to 10 white LEDs per string, limited by its 40V maximum string voltage rating. With typical white LED forward voltage (VF) of ~3.6V, this yields 10 × 3.6V = 36V - safely within the 40V limit. For red LEDs (VF ≈ 2.4V), up to 15 LEDs per string are supported. The ATMSL3162BT does not drive individual LEDs but sinks current from entire series strings connected to STR0–STR15.
How does the Efficiency Optimizer in the ATMSL3162BT improve system efficiency?
The ATMSL3162BT's Efficiency Optimizer reduces power loss in its internal current-sink MOSFETs by dynamically adjusting external LED supply voltage to the minimum needed for regulation. Using FBI/FBO feedback loops, it injects current into the DC-DC converter's voltage-divider network to lower output voltage - minimizing voltage headroom and conduction losses. This feature is especially valuable in multi-chip configurations where ATMSL3162BT devices automatically negotiate the lowest common supply voltage.
Can multiple ATMSL3162BT devices share the same I²C bus? How many addresses are available?
Yes, up to 16 ATMSL3162BT devices can share a single 1MHz I²C/SMBus interface. Address selection is controlled by AD0 and AD1 pins, which accept GND, VDD, SCL, or SDA to configure one of 16 unique slave addresses. The device also supports broadcast write commands, allowing simultaneous register updates across all connected ATMSL3162BT units - essential for synchronized backlight control in large-panel systems.
What fault conditions does the ATMSL3162BT monitor, and how are they reported?
The ATMSL3162BT monitors open-circuit, short-circuit, and die over-temperature faults on a per-string basis. Fault status is reported both asynchronously via the open-drain FLTB pin (active-low) and synchronously through dedicated I²C registers (e.g., OCSTAT0/1, SCSTAT0/1, FLTSTATUS). Once asserted, FLTB remains low until the corresponding fault status registers are read - ensuring no fault event is missed in polled or interrupt-driven systems.
Does the ATMSL3162BT require external components for basic operation?
Yes - the ATMSL3162BT requires at minimum: (1) a 10µF ceramic capacitor from VIN to GND, (2) a 1µF capacitor from VDD to GND, (3) an external resistor (e.g., 34.8kΩ) from ILED to GND to set full-scale current, and (4) external DC-DC converters for LED string supplies. Optional components include Schottky diodes on FBO lines for reverse-current protection and RC filters on PHI/GSC if noise immunity is needed. No external clock source is required - the internal oscillator runs at 20MHz.
ATMSL3162BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 40-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Type:
- AC DC Offline Switcher
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 4.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 105mA
- Frequency:
- -
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 40-TQFN (6x6)
ATMSL3162BT FAQ
1.How can I place an order for ATMSL3162BT through Aetrix?
Please submit a Request for Quotation (RFQ) for ATMSL3162BT 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 ATMSL3162BT reliable?
The price and inventory of ATMSL3162BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATMSL3162BT is usually 5 days.
3.What payment methods are accepted for ATMSL3162BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATMSL3162BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATMSL3162BT?
ATMSL3162BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATMSL3162BT 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 ATMSL3162BT?
For technical support, including ATMSL3162BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATMSL3162BT requirements.
6.How does Aetrix verify that ATMSL3162BT is sourced from the original manufacturer or authorized distributors?
All ATMSL3162BT 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 ATMSL3162BT meets industry standards.
7.What is the process for return or replacement of ATMSL3162BT?
All ATMSL3162BT units undergo pre-shipment inspection (PSI). If there is an issue with ATMSL3162BT, 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 ATMSL3162BT part is unused and in its original packaging.
Return procedure for ATMSL3162BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ATMSL3162BT Tags
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