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Microchip Technology MSL3167GU-R
- Part No.:
- MSL3167GU-R
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 32-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MSL3167GU-R.pdf
- Description:
- IC LED DRVR LIN PWM 30MA 32SOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,712
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Product details
Overview
MSL3167GU-R from Atmel is a 16-channel white LED driver IC with in-phase string control, internal current-sink MOSFETs rated for up to 30mA per string, ±3% current accuracy, adaptive DC-DC power optimization via FBO pin, and integrated open/short-circuit and over-temperature fault management. It targets high-reliability LED backlighting in medical instrumentation displays.
For engineers reviewing the MSL3167GU-R datasheet, MSL3167GU-R pinout, MSL3167GU-R application, or MSL3167GU-R equivalent, key selection considerations include its 32-pin SOP package, single-resistor global current setting (ILED), 20.52mm × 7.49mm footprint, -40°C to +105°C operating range, and compatibility with external PWM dimming at 20Hz–50kHz.
Technical Context
The MSL3167GU-R implements adaptive source power control using an Efficiency Optimizer that dynamically adjusts the external DC-DC converter's output voltage via the FBO pin (0–365µA current sourcing) to maintain minimum headroom (150mV) while preserving ±3% current matching across all 16 strings. It uses a single 5V VIN supply to power an internal 2.5V LDO (VDD) and drives LED strings with synchronous, in-phase PWM timing-unlike the phase-shifted MSL3168GU-R.
Fault handling is hardware-automated: FLTB pin asserts low on open/short-circuit detection (8.4V threshold) or thermal shutdown (>135°C), cleared only by EN deactivation or power cycle. The I²C/SMBus interface (SCL/SDA, 1MHz max) is optional for status monitoring and register configuration but not required for basic operation.
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 String Current | 30mA per string, set globally by single resistor from ILED to GND (e.g., 25.5kΩ → 30mA) |
| Current Accuracy | ±3% typical matching across strings; <5% worst-case variation at full scale |
| PWM Dimming Range | 0–100% duty cycle, 20Hz–50kHz frequency - directly controls all strings synchronously |
| Fault Detection | Hardware-monitored open-circuit (STRx >8.4V), short-circuit, and over-temperature (>135°C); FLTB active-low alert |
| Package & Temp | 32-pin SOP, 1.27mm pitch, 20.52mm × 7.49mm × 2.49mm; operates from -40°C to +105°C ambient |
| Supply & Regulation | 5V VIN input (4.75–5.5V); internal 2.5V VDD LDO (2.4–2.6V) powers logic; PGND handles up to -720mA sink return |
Pinout & Package
MSL3167GU-R is housed in a wave-solderable 32-pin SOP package (1.27mm pitch) with exposed pad (EP) connected to PGND for thermal and current return path integrity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| STR0–STR15 (Pins 1,16–23,26–32) | LED string current sink outputs | Sink up to 30mA each; connect cathode of bottom LED in string to respective STRn; unused pins must tie to GND |
| FLTB (Pin 2) | Fault indicator output | Active-low open-drain signal; sinks current when any string fault or over-temperature occurs; cleared only by pulling EN low or cycling power |
| ILED (Pin 8) | Global current reference input | Resistor from ILED to GND sets full-scale current (e.g., 38.3kΩ → 20mA); regulated at 350mV |
| EN (Pin 9) | Enable control input | Active-high logic; high = normal operation; low = all strings off, FLTB cleared, quiescent current ~10µA |
| PWM (Pin 15) | Brightness control input | Accepts 20Hz–50kHz PWM signal; sets both period and duty cycle for all 16 strings simultaneously and in phase |
| FBO (Pin 13) | Efficiency Optimizer output | Sources 0–365µA to external DC-DC feedback divider to dynamically minimize LED supply voltage and power loss |
| PGND (Pin 7) & EP | Power ground return | Primary path for all 16 string sink currents; must connect to string supply ground with wide trace; EP soldered to PGND for thermal relief |
Key Features
| Feature | Design Value |
|---|---|
| In-phase string drive | All 16 STR outputs switch synchronously-no intentional phase delay-reducing EMI and simplifying timing analysis vs. auto-phased variants |
| Adaptive power optimization | FBO pin dynamically trims external DC-DC output voltage to match real-time LED forward voltage, cutting power dissipation without compromising current regulation |
| Single-point current calibration | One external resistor (ILED-to-GND) sets identical full-scale current for all 16 channels-eliminates per-string trimming and improves production yield |
| Hardware fault autonomy | Open/short detection and thermal shutdown operate independently of I²C interface; FLTB provides immediate system-level alert without host polling |
| Robust thermal design | Exposed pad (EP) tied to PGND delivers low-thermal-resistance path; rated for 1576mW continuous dissipation at TA ≤70°C with 28.7mW/°C derating |
Applications
| Medical Instrumentation Backlighting | Industrial HMI Displays |
|---|---|
Use Scenario: High-brightness, flicker-free backlight for diagnostic monitors requiring long-term luminance stability and zero maintenance downtime. IC Role / Device Role / Timing Role: Primary LED current controller managing 16 parallel strings of 8–10 white LEDs; synchronized PWM dimming ensures uniform intensity without beat frequencies. Use Value: ±3% current matching and adaptive voltage control maintain consistent color temperature and brightness over temperature and aging-critical for clinical image fidelity. | Use Scenario: Ruggedized operator interface in factory automation panels exposed to wide ambient temperatures and electrical noise. IC Role / Device Role / Timing Role: Fault-tolerant LED driver with hardware-level open/short detection and thermal shutdown; FLTB pin interfaces directly to PLC safety logic. Use Value: Automatic fault isolation prevents cascading failures; -40°C to +105°C rating ensures reliable startup and operation in unconditioned industrial enclosures. |
| Automotive Infotainment Displays | Professional Broadcast Monitors |
Use Scenario: AEC-Q200–compliant backlight for center-stack infotainment systems where EMI and thermal margin are constrained. IC Role / Device Role / Timing Role: In-phase PWM driver minimizing peak current demand on vehicle 5V rail; FBO optimizes efficiency to reduce heat in sealed bezels. Use Value: Synchronous switching lowers conducted EMI vs. phase-shifted alternatives; 30mA per string supports high-luminance RGBW configurations without external boosters. | Use Scenario: Reference-grade LCD backlight in color-accurate broadcast monitors requiring precise dimming linearity and minimal grayscale banding. IC Role / Device Role / Timing Role: Precision current sink with <10µA string-off leakage and 200mA/µs slew rate enabling clean 12-bit PWM resolution via external controller. Use Value: Low leakage and tight current matching eliminate ghosting between adjacent gray levels; adaptive voltage control maintains stable Vf headroom across 0–100% dimming range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MSL3168GU-R | Identical pinout and core specs, but applies 1/16th-PWM-period phase delay across successive strings to reduce input ripple current | Better suited for systems with limited input capacitance or strict EMI limits; requires same PCB layout but different register initialization | Select MSL3168GU-R if input ripple reduction is prioritized; MSL3167GU-R preferred for lowest EMI susceptibility and deterministic timing |
| TLC6983RTVR | 16-channel LED driver with 30mA per channel, but uses SPI interface (not I²C), no FBO adaptive control, and 24-pin QFN package | Lacks autonomous fault reporting and adaptive power optimization; requires external MCU for fault response and voltage trim | Choose TLC6983RTVR only if SPI-native architecture exists and adaptive efficiency is not required; MSL3167GU-R offers higher integration and lower BOM count |
Compared with MSL3168GU-R, the MSL3167GU-R delivers simpler timing control and lower EMI sensitivity due to in-phase operation, while differing from TLC6983RTVR by embedding autonomous fault management and analog FBO-based power optimization-reducing firmware overhead and external component count.
Availability
MSL3167GU-R is available at Aetrix Electronics and suitable for medical instrumentation backlighting, industrial HMI displays, and automotive infotainment systems requiring stable component supply, long-lifecycle support, and AEC-Q200–aligned reliability.
Supply support for MSL3167GU-R 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
Atmel Corporation (now part of Microchip Technology) designs high-integration analog and mixed-signal ICs for embedded control, sensing, and power management applications.
The MSL3167GU-R belongs to Atmel's LED driver product line, engineered specifically for high-channel-count, high-accuracy white LED backlighting in demanding environments where thermal resilience, fault autonomy, and adaptive efficiency are critical.
FAQ
What is the maximum LED string current supported by the MSL3167GU-R?
The MSL3167GU-R supports up to 30mA per LED string, set globally by a single external resistor connected from the ILED pin to GND. For example, a 25.5kΩ resistor yields 30mA full-scale current. This value is guaranteed under thermal limits and assumes proper PCB layout with adequate PGND copper area.
Does the MSL3167GU-R require an external microcontroller to operate?
No, the MSL3167GU-R operates autonomously with only three external connections: a single PWM signal for brightness control, a resistor on ILED to set current, and an external DC-DC converter controlled via the FBO pin. The I²C interface is optional for status monitoring or advanced configuration but not needed for basic in-phase LED driving.
How does the MSL3167GU-R handle LED string faults?
The MSL3167GU-R detects open-circuit (STRx >8.4V), short-circuit, and over-temperature (>135°C) conditions in hardware. Upon detection, it pulls the FLTB pin low. This signal remains asserted until EN is driven low or power is cycled-enabling immediate system-level fault response without software intervention.
What is the role of the FBO pin on the MSL3167GU-R?
The FBO (Feedback Optimizer) pin on the MSL3167GU-R sources 0–365µA to the feedback node of an external DC-DC converter. By dynamically adjusting this current, the MSL3167GU-R minimizes the converter's output voltage to the exact level needed for LED current regulation-reducing power loss and heat generation while maintaining ±3% current accuracy.
Can the MSL3167GU-R drive more than 10 LEDs per string?
No-the MSL3167GU-R is specified to drive up to 10 white LEDs per string. Exceeding this count risks violating the 40V absolute maximum rating on STR0–STR15 pins, especially at high forward voltages and elevated temperatures. Design margin must account for worst-case Vf, temperature drift, and headroom (minimum 150mV).
MSL3167GU-R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- Adaptive SourcePower™
- Package/Case:
- 32-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 16
- Voltage - Supply (Min):
- 4.75V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- -
- Current - Output / Channel:
- 30mA
- Frequency:
- -
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- Automotive
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 32-SOP
MSL3167GU-R FAQ
1.How can I place an order for MSL3167GU-R through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL3167GU-R 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 MSL3167GU-R reliable?
The price and inventory of MSL3167GU-R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL3167GU-R is usually 5 days.
3.What payment methods are accepted for MSL3167GU-R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL3167GU-R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL3167GU-R?
MSL3167GU-R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL3167GU-R 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 MSL3167GU-R?
For technical support, including MSL3167GU-R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL3167GU-R requirements.
6.How does Aetrix verify that MSL3167GU-R is sourced from the original manufacturer or authorized distributors?
All MSL3167GU-R 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 MSL3167GU-R meets industry standards.
7.What is the process for return or replacement of MSL3167GU-R?
All MSL3167GU-R units undergo pre-shipment inspection (PSI). If there is an issue with MSL3167GU-R, 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 MSL3167GU-R part is unused and in its original packaging.
Return procedure for MSL3167GU-R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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