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Microchip Technology CL320SG-G
- Part No.:
- CL320SG-G
- Manufacturer:
- Microchip Technology
- Category:
- LED Drivers
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
CL320SG-G.pdf
- Description:
- IC LED DRVR LIN PWM 20MA 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:9,623
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Product details
Overview
CL320SG-G from Microchip Technology is a 3-channel, 20 mA fixed-current linear LED driver in an 8-lead SOIC package with heat slug, designed for constant-current sinking of parallel LED strings with ±6% current accuracy across 4–15 V output range and 90 V standoff voltage. It supports independent PWM dimming per channel and overtemperature shutdown at 135°C.
For engineers reviewing the CL320SG-G datasheet, CL320SG-G pinout, CL320SG-G application, or CL320SG-G equivalent, key selection criteria include channel independence, thermal protection behavior, VIN operating range (6.5–90 V), output current tolerance, and SOIC thermal pad layout requirements.
Technical Context
The CL320SG-G implements three independent linear current sinks with active-low enable inputs (EN1–EN3), each regulating 20 mA with ±6% accuracy over VOUT = 4–15 V. Its internal regulator accepts 6.5–90 V input and draws only 220–250 µA quiescent current when enabled.
Thermal protection activates at 135°C junction temperature with 30°C hysteresis, forcing full-channel shutdown. The exposed underside thermal pad is internally connected to GND and must be soldered to PCB copper for heatsinking-critical for sustained 20 mA/channel operation under high VOUT conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 20 mA per channel, ±6% tolerance over 4–15 V VOUT range-ensures consistent LED brightness without external feedback. |
| Supply Voltage Range | 6.5 V to 90 V VIN-supports wide-input industrial and automotive LED lighting rails without external regulators. |
| Standoff Voltage | 90 V-enables safe operation in transient-prone environments such as 24/48 V DC systems with load-dump spikes. |
| Enable Input Logic | Active-low EN1/EN2/EN3 with VEN(OFF) ≥ 2.4 V and VEN(ON) ≤ 0.8 V-compatible with standard CMOS/TTL microcontroller outputs. |
| Thermal Shutdown | Triggers at TJ = 135°C with 30°C hysteresis-prevents permanent damage during overload or poor heatsinking. |
| Package Thermal Resistance | θJA = 84°C/W on JEDEC 2s2p board-requires thermal pad soldering to achieve rated current at elevated ambient temperatures. |
| Quiescent Current | 220–250 µA when enabled; 2.2–2.3 mA when disabled-minimizes system standby power loss. |
Pinout & Package
CL320SG-G uses an 8-lead SOIC (narrow body) package with integrated heat slug (exposed GND pad on underside). Dimensions: 4.90 × 3.90 mm body, 1.70 mm max height, 1.27 mm pitch. The thermal pad must be soldered to ≥1 cm² PCB copper area for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - EN1 | Channel 1 enable input | Active-low control: drives OUT1 sink when logic low; enables PWM dimming or fault isolation per string. |
| 2 - EN2 | Channel 2 enable input | Independent active-low control for OUT2-allows asymmetric dimming or selective channel disable. |
| 3 - EN3 | Channel 3 enable input | Independent active-low control for OUT3-supports three-step linear dimming via 1/2/3 channel activation. |
| 4 - GND | Power and signal reference | Common return for VIN, EN inputs, and internal regulator; electrically tied to underside thermal pad. |
| 5 - OUT3 | Constant-current sink output | Sinks 20 mA to LED cathodes; voltage compliance up to 15 V-connects directly to LED string cathode. |
| 6 - OUT2 | Constant-current sink output | Identical to OUT3; independent current path-enables separate thermal management per channel. |
| 7 - OUT1 | Constant-current sink output | Identical to OUT3; fully isolated current path-prevents cross-channel failure propagation. |
| 8 - VIN | High-voltage supply input | Accepts 6.5–90 V; requires local 100 nF ceramic bypass capacitor to GND for stability and noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Per-channel enable logic | Three independent active-low EN pins allow precise PWM dimming, three-step linear dimming, or individual LED string disconnection without affecting other channels. |
| Fixed 20 mA current regulation | ±6% accuracy over 4–15 V VOUT eliminates need for external current-setting resistors or feedback networks-reduces BOM count and layout complexity. |
| Integrated thermal protection | 135°C shutdown with 30°C hysteresis ensures reliable operation under thermal stress while enabling automatic recovery-no external thermal sensor required. |
| High-voltage input capability | 90 V standoff and 6.5–90 V operating range support direct connection to unregulated industrial rails, reducing need for pre-regulation stages. |
| SOIC with thermal slug | Exposed GND pad improves thermal dissipation by >30% vs. standard SOIC-enables sustained 20 mA/channel operation at 70°C ambient with proper PCB copper area. |
Applications
| LCD Backlighting | Industrial Indicator Lamps |
|---|---|
Use Scenario: Driving three parallel white LED strings behind TFT-LCD panels in medical displays or industrial HMIs requiring uniform brightness and flicker-free dimming. IC Role / Device Role / Timing Role: Constant-current sink per string with independent EN control-enables synchronized or staggered PWM dimming to eliminate beat frequencies. Use Value: ±6% current matching ensures <1% luminance variation across strings; 90 V standoff withstands ESD and surge events common in panel-integrated power supplies. |
Use Scenario: Powering status indicator LEDs on PLC I/O modules, motor drives, or power distribution units where reliability and long service life are critical. IC Role / Device Role / Timing Role: Three independent 20 mA sinks-allows separate color-coded indicators (e.g., RUN/FAULT/COMM) with individual on/off control via MCU GPIOs. Use Value: Overtemperature shutdown prevents thermal runaway during extended fault conditions; SOIC thermal pad ensures >10-year MTBF at 60°C ambient. |
| Automotive Interior Lighting | Architectural Accent Lighting |
Use Scenario: Illuminating dashboard controls, footwell lighting, or door courtesy lamps in 12/24 V vehicle systems subject to load dump transients. IC Role / Device Role / Timing Role: Linear current sink with 90 V standoff-absorbs ISO 7637-2 Pulse 5a transients without external TVS diodes. Use Value: 6.5–90 V VIN range covers cold-crank (6.5 V) to load-dump (up to 87 V); EN pin timing (tON = 2.4 µs, tOFF = 800 ns) supports 100 kHz PWM for smooth dimming. |
Use Scenario: Low-profile LED strips in retail signage or hospitality cove lighting where minimal board space and silent operation are mandatory. IC Role / Device Role / Timing Role: Fixed-current sink eliminating switching noise-ideal for EMI-sensitive environments where buck converters cause interference. Use Value: Zero EMI from switching; SOIC thermal pad allows mounting on aluminum extrusions for passive cooling-no fans or heatsinks required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3-channel linear LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CL325SG-G | 25 mA per channel output; identical pinout, package, and feature set-only differs in nominal current rating. | Used where higher LED forward voltage or longer strings require >20 mA drive capability. | Select CL325SG-G only if design requires ≥22.5 mA minimum current under worst-case VOUT (4–15 V) and temperature. |
| CL330SG-G | 30 mA per channel output; same SOIC package, EN logic, thermal protection, and 90 V standoff-no functional or interface differences beyond current rating. | Deployed in high-brightness signage or automotive exterior lighting where luminous flux demands exceed CL320SG-G capability. | Choose CL330SG-G when LED string Vf and thermal margin necessitate ≥27 mA guaranteed current at 15 V VOUT and 85°C ambient. |
Compared with CL320SG-G, CL325SG-G and CL330SG-G offer higher per-channel current but identical thermal behavior, enable timing, and protection features-selection depends solely on required LED drive level, not compatibility or functionality.
Availability
CL320SG-G is available at Aetrix Electronics and suitable for LCD backlighting, industrial indicator lamps, and automotive interior lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for CL320SG-G 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 is a global semiconductor company specializing in microcontrollers, analog devices, and timing solutions, with ISO/TS 16949-certified manufacturing and broad industrial qualification.
The CL320/CL325/CL330 family was designed specifically for cost-sensitive, low-noise, multi-string LED biasing in space-constrained applications where switching noise or complex feedback is unacceptable.
FAQ
What is the maximum output voltage compliance for CL320SG-G?
The CL320SG-G maintains 20 mA regulation with ±6% accuracy up to 15 V output voltage (VOUT). Beyond 15 V, output current degrades linearly-down to 18 mA at 90 V VOUT. For designs requiring >15 V compliance, consider paralleling outputs or using external dropper elements as described in Figure 3-2 of DS20005599A.
Does CL320SG-G require external current-setting components?
No. The CL320SG-G integrates precision current regulation circuitry delivering a fixed 20 mA per channel with no external resistors or feedback required. Its ±6% accuracy over 4–15 V VOUT is achieved entirely within the IC, simplifying layout and reducing bill-of-materials cost compared to adjustable linear drivers.
How does the thermal protection in CL320SG-G behave during overload?
When the CL320SG-G junction temperature reaches +135°C, all three output channels shut down simultaneously. Operation resumes only after die temperature falls by 30°C (to ~105°C), ensuring safe cooldown before restart. This hysteresis prevents thermal oscillation during marginal thermal conditions.
Can CL320SG-G drive LED strings with different forward voltages?
Yes. Each channel operates independently with its own OUTx pin and ENx control. As long as individual VOUT remains within 4–15 V, the CL320SG-G regulates 20 mA per string regardless of inter-string Vf mismatch-making it suitable for mixed-color or aged LED arrays where forward voltage drifts occur.
What is the recommended PCB layout practice for CL320SG-G's thermal pad?
The exposed underside thermal pad of CL320SG-G must be soldered to ≥1 cm² of solid copper on the PCB, preferably connected to the GND plane. Microchip specifies this for θJA = 84°C/W performance; omitting the pad or using insufficient copper raises junction temperature by >25°C at full load, risking premature thermal shutdown.
CL320SG-G Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Linear
- Topology:
- -
- Internal Switch(s):
- Yes
- Number of Outputs:
- 3
- Voltage - Supply (Min):
- 6.5V
- Voltage - Supply (Max):
- 90V
- Voltage - Output:
- 4V ~ 90V
- Current - Output / Channel:
- 20mA
- Frequency:
- 0Hz ~ 100kHz
- Dimming:
- PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 119°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC-EP
CL320SG-G FAQ
1.How can I place an order for CL320SG-G through Aetrix?
Please submit a Request for Quotation (RFQ) for CL320SG-G 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 CL320SG-G reliable?
The price and inventory of CL320SG-G are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CL320SG-G is usually 5 days.
3.What payment methods are accepted for CL320SG-G?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CL320SG-G transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CL320SG-G?
CL320SG-G orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CL320SG-G 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 CL320SG-G?
For technical support, including CL320SG-G datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CL320SG-G requirements.
6.How does Aetrix verify that CL320SG-G is sourced from the original manufacturer or authorized distributors?
All CL320SG-G 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 CL320SG-G meets industry standards.
7.What is the process for return or replacement of CL320SG-G?
All CL320SG-G units undergo pre-shipment inspection (PSI). If there is an issue with CL320SG-G, 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 CL320SG-G part is unused and in its original packaging.
Return procedure for CL320SG-G:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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