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Microchip Technology MSL1064-TC
- Part No.:
- MSL1064-TC
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 24-WQFN Exposed Pad
- Datasheet:
-
MSL1064-TC.pdf
- Description:
- IC LED DRV RGLTR PWM 30MA 24TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,420
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Product details
Overview
MSL1064-TC from Microchip Technology (formerly Atmel) is a 6-string PWM LED driver IC with integrated digitally compensated 1.1 MHz, 48 V boost regulator, ±1.5% string-to-string current balance, I²C/SMBus interface, and 24-pin TQFN package. It delivers up to 30 mA per string at up to 48 V output for 8 W backlighting in notebook PCs and medical instrumentation.
For engineers reviewing the MSL1064-TC datasheet, MSL1064-TC pinout, MSL1064-TC application, or MSL1064-TC equivalent, key selection considerations include its fixed I²C slave address (0x62), 4.75–36 V input range, 1.1 MHz boost switching frequency enabling compact magnetics, ±1.5% current matching across six strings, and dual dimming control via I²C (256:1 PWM + 16:1 analog = 12-bit resolution) or external PWM/ALS/NTC inputs.
Technical Context
The MSL1064-TC integrates a current-mode PWM boost controller with a 50 V internal MOSFET switch and no external compensation required. Its digital control loop maintains regulation by dynamically selecting the lowest-voltage LED string (STR0–STR5) to set the boost output voltage, ensuring headroom for all strings while minimizing power loss.
It supports three independent dimming paths: 8-bit I²C PWM (256-step), 4-bit I²C analog current scaling (16-step), and real-time analog control via IADJ (0–1.22 V) or external PWM (up to 40 kHz). Fault management includes per-string open-circuit and short-circuit detection, automatic disable of faulty strings, and active-low FLTB reporting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| LED strings | 6 independent current sinks (STR0–STR5), each sinking up to 30 mA |
| Boost output voltage | Up to 48 V max - supports up to 12 white LEDs/strings (3.75 V max VF × 12 = 45 V + 600 mV sink headroom + 900 mV rectifier drop) |
| Current matching | ±1.5% string-to-string accuracy - ensures uniform brightness across displays without manual calibration |
| Switching frequency | 1.1 MHz (set by 115 kΩ OSC resistor) - enables use of small 10 µH inductors and low-ESR ceramic capacitors |
| I²C interface | Fixed slave address 0x62 (7-bit), SMBus-compatible, up to 1 MHz - supports register-level control of dimming, enable, and fault status |
| Input voltage range | 4.75 V to 36 V - compatible with 5 V, 12 V, and 24 V industrial and automotive supply rails |
| Operating temperature | −40 °C to +85 °C - qualified for industrial and medical display environments |
Pinout & Package
MSL1064-TC is housed in a lead-free, halogen-free, RoHS-compliant 5 mm × 5 mm × 0.75 mm TQFN package with 24 pins and 0.65 mm pitch, featuring an exposed thermal pad for enhanced power dissipation (θJA = 24.1 °C/W on 2-layer JEDEC board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 24) | Primary power input | Supplies boost regulator and internal LDOs; accepts 4.75–36 V; bypass with ≥1 µF ceramic capacitor to GND |
| SW (Pins 20, 21) | Boost switch drain | Connects to inductor and Schottky rectifier; 50 V rated, 2 A current limit; requires minimum 0.6 mm clearance per IPC-2221A |
| STR0–STR5 (Pins 17–12) | LED string current sinks | Sink up to 30 mA each; cathode-connected; automatically disabled on open/short fault; 0.6 V compliance voltage |
| IADJ (Pin 11) | Analog dimming input | 0–1.22 V linear control of full-scale current (0–100%); connects to ambient light sensor or thermistor circuit |
| FLTB (Pin 8) | Fault indicator output | Active-low open-drain signal asserting on any string fault (open, short, over-temp); requires pull-up; resets via EN toggle or I²C |
| EN (Pin 23) | Enable input | Active-high logic control; enables/disables entire device; internal 10.5 kΩ series resistor and 5.8 V Zener clamp |
| SDA/SCL (Pins 5, 6) | I²C bidirectional data/clock | Supports 1 MHz operation; 10 pF input capacitance; internal 50 ns noise filter; 0.4 V VOL @ 6 mA |
| PWM (Pin 7) | External PWM dimming input | Accepts 0–40 kHz logic-level PWM; directly modulates LED current without I²C; min on/off times: 14 µs / 3.2 µs |
Key Features
| Feature | Design Value |
|---|---|
| Digitally compensated 1.1 MHz boost regulator | Eliminates external compensation components; achieves >92% efficiency with 10 µH inductor and ceramic output caps |
| 12-bit total dimming resolution | 256-step PWM + 16-step analog scaling via I²C registers - enables precise grayscale and flicker-free dimming |
| Per-string fault detection & auto-disable | Monitors STR0–STR5 for open-circuit (>0.1 V) and short-circuit (<4.4 V); isolates faults without affecting other strings |
| ALS/NTC analog interface | IADJ pin accepts 0–1.22 V input for real-time brightness adjustment based on ambient light or temperature derating |
| Stand-alone operation mode | Full functionality without I²C: EN, PWM, IADJ, and FLTB enable system-level control using discrete logic or microcontroller GPIO |
Applications
| Notebook PC Backlighting | Medical Instrument Display |
|---|---|
|
Use Scenario: Driving 60 white LEDs (10 per string × 6 strings) in a 15.6″ LCD panel with uniform luminance and thermal stability. IC Role / Device Role / Timing Role: Primary LED current controller and boost power manager; regulates string current to ±1.5% and adjusts output voltage dynamically per string voltage. Use Value: Enables high-brightness, low-flicker backlighting with single-chip integration - eliminates need for separate boost controller and current DACs. |
Use Scenario: Illuminating high-reliability diagnostic display in portable ultrasound or patient monitor with ambient-adaptive brightness. IC Role / Device Role / Timing Role: LED driver with ALS-coupled analog dimming and fault-safe shutdown; maintains visibility under varying lighting while preventing LED overcurrent. Use Value: IADJ-driven 0–100% linear dimming and open-circuit fault detection ensure continuous operation and regulatory compliance in safety-critical systems. |
| Industrial Signage | Automotive Infotainment Display |
|
Use Scenario: Powering 72-LED red signage array (12 per string × 6 strings) in outdoor kiosk with wide input voltage tolerance. IC Role / Device Role / Timing Role: High-efficiency boost LED driver supporting 4.75–36 V input; manages 2.5 V red LED strings up to 45 V total string voltage. Use Value: Wide VIN range and ±1.5% current matching deliver consistent color and brightness across large-area signage without per-string trimming. |
Use Scenario: Backlighting TFT display in automotive audio head unit exposed to −40 °C to +85 °C ambient and load-dump transients. IC Role / Device Role / Timing Role: Robust LED driver with thermal shutdown (135 °C), OVP (programmable via R8/R9), and 48 V boost capability for long LED strings. Use Value: Guaranteed operation across automotive temperature range and protection against battery overvoltage events reduce system-level BOM and validation effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 6-string LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| IS31FL3728-QFLS4 | 48-channel matrix driver (not constant-current string sink); uses PWM-only dimming; no integrated boost | Requires external boost converter; suited for RGB pixel control, not high-voltage backlight strings | Select only if driving low-VF, low-current indicator LEDs in multiplexed arrays - not a functional replacement for MSL1064-TC's 48 V boost + 6-string architecture |
| LM3409MY/NOPB | Controller-only (no integrated FET or current sinks); requires external MOSFET, sense resistor, and string transistors | Greater design flexibility but higher component count; lacks I²C, fault reporting, and multi-string matching | Choose when custom topology or >48 V output is needed; MSL1064-TC offers faster time-to-market for standard 6-string backlight designs |
Compared with IS31FL3728-QFLS4 and LM3409MY/NOPB, the MSL1064-TC uniquely integrates boost regulation, six matched current sinks, I²C programmability, and per-string fault management in one 5×5 mm package - reducing PCB area, BOM count, and firmware complexity for display backlighting.
Availability
MSL1064-TC is available at Aetrix Electronics and suitable for notebook PC backlighting, medical instrument displays, and industrial signage requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for MSL1064-TC 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 qualification for legacy Atmel analog and LED driver portfolios.
The MSL1064-TC belongs to Microchip's high-accuracy LED backlight driver family, designed specifically for energy-efficient, uniform-brightness display illumination in space-constrained industrial and consumer applications.
FAQ
What is the maximum number of LEDs the MSL1064-TC can drive per string?
The MSL1064-TC supports up to 12 white LEDs per string, calculated from its 48 V maximum boost output minus 600 mV sink headroom and ~900 mV rectifier drop, yielding ~45 V usable string voltage. Using LEDs with max 3.75 V forward voltage (e.g., 3.75 V × 12 = 45 V), the MSL1064-TC fully utilizes its voltage capability. Exceeding 12 LEDs risks OVP trip or regulation loss. The MSL1064-TC datasheet confirms this limit in the Quick Start Guide (page 4).
Does the MSL1064-TC require external compensation components for the boost regulator?
No, the MSL1064-TC features a digitally compensated current-mode boost regulator that requires no external compensation network. Its internal digital control loop stabilizes the output using only the OSC resistor (115 kΩ) to set frequency. This eliminates loop compensation design effort and component variability, enabling robust performance across temperature and load. The MSL1064-TC datasheet explicitly states "no external compensation required" in the General Description (page 2).
How does the MSL1064-TC handle I²C address conflicts in multi-driver systems?
The MSL1064-TC has a fixed I²C slave address of 0x62 (7-bit), so only one MSL1064-TC can reside on a shared I²C bus without address collision. For multi-driver RGB or multi-zone applications, use the pin-selectable MSL1061 (four addresses: 0x60–0x63) instead. The MSL1064-TC datasheet clarifies this limitation in Table 1 (page 5) and the Quick Start Guide (page 4), advising MSL1064-TC for single-driver or isolated-bus configurations.
Can the MSL1064-TC operate without an I²C interface?
Yes, the MSL1064-TC supports full stand-alone operation using dedicated pins: EN for global on/off, PWM for direct pulse-width dimming, IADJ for analog brightness control (e.g., from ALS), and FLTB for fault indication. No I²C firmware or host processor is required. This mode is documented in Table 2 (page 5) and the Application Information section (page 16) of the MSL1064-TC datasheet.
What thermal protection features does the MSL1064-TC include?
The MSL1064-TC incorporates thermal shutdown with a rising threshold of 135 °C and 10 °C hysteresis, plus overvoltage protection (OVP) configurable via external resistors (R8/R9) to safeguard the boost output. These protections are specified in the Absolute Maximum Ratings (page 10) and Electrical Characteristics tables (page 12). The exposed thermal pad in the TQFN package further enhances heat dissipation, supporting 2286 mW continuous power at 70 °C ambient.
MSL1064-TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 24-WQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 6
- Voltage - Supply (Min):
- 4.75V
- Voltage - Supply (Max):
- 36V
- Voltage - Output:
- 48V
- Current - Output / Channel:
- 30mA
- Frequency:
- 1.1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TQFN (5x5)
MSL1064-TC FAQ
1.How can I place an order for MSL1064-TC through Aetrix?
Please submit a Request for Quotation (RFQ) for MSL1064-TC 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 MSL1064-TC reliable?
The price and inventory of MSL1064-TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MSL1064-TC is usually 5 days.
3.What payment methods are accepted for MSL1064-TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MSL1064-TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MSL1064-TC?
MSL1064-TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MSL1064-TC 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 MSL1064-TC?
For technical support, including MSL1064-TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MSL1064-TC requirements.
6.How does Aetrix verify that MSL1064-TC is sourced from the original manufacturer or authorized distributors?
All MSL1064-TC 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 MSL1064-TC meets industry standards.
7.What is the process for return or replacement of MSL1064-TC?
All MSL1064-TC units undergo pre-shipment inspection (PSI). If there is an issue with MSL1064-TC, 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 MSL1064-TC part is unused and in its original packaging.
Return procedure for MSL1064-TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MSL1064-TC Tags
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BCR402RE6327HTSA1
Infineon Technologies
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BCR430UXTSA2
Infineon Technologies
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BCR420UE6433HTMA1
Infineon Technologies
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BCR420UE6327HTSA1
Infineon Technologies
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BCR421UE6327HTSA1
Infineon Technologies
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LYT1604D-TL
Power Integrations
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HV9910CLG-G
Microchip Technology
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CL2N8-G
Microchip Technology
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BCR420UW6-7
Diodes Incorporated
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BCR421UW6-7
Diodes Incorporated
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BCR420UFD-7
Diodes Incorporated
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BCR421UFD-7
Diodes Incorporated
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