Microchip Technology CL325SG-G

Overview

CL325SG-G from Microchip Technology is a 3-channel, 25 mA fixed-output linear LED driver in an 8-lead SOIC package with heat slug. It delivers ±6% current accuracy across 4–15 V output range, supports independent PWM dimming per channel via active-low enable pins (EN1/EN2/EN3), and integrates overtemperature shutdown at 135°C. It is designed for stable, low-noise LED biasing in LCD backlighting and indicator lamp systems.

For engineers reviewing the CL325SG-G datasheet, CL325SG-G pinout, CL325SG-G application, or CL325SG-G equivalent, key selection criteria include its 90 V standoff voltage, 25 mA per-channel sink capability, thermal protection behavior, and compatibility with shared 100 nF VIN bypass capacitor in multi-driver layouts.

Technical Context

The CL325SG-G operates as a high-voltage linear constant-current sink with three independent output channels (OUT1–OUT3), each sinking up to 25 mA with ±6% accuracy over 4–15 V output voltage range. Its enable inputs are active-low and electrically isolated per channel, enabling precise PWM dimming or fault-isolation control without external logic.

Internally, it features a bandgap-regulated current reference and thermal shutdown circuitry that disables all outputs when junction temperature reaches 135°C, with 30°C hysteresis. The device accepts 6.5–90 V input supply and draws only 220–250 µA quiescent current when enabled, minimizing system power overhead.

Key Specifications

Pinout & Package

CL325SG-G uses an 8-lead SOIC package with exposed thermal pad (underside plate) internally connected to GND. The pad must be soldered to a ≥1 cm² copper area on PCB for effective heatsinking. Package dimensions: 4.90 × 3.90 mm body, 1.70 mm max height, 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar 3-channel linear LED driver applications.

Compared with CL325SG-G, CL320SG-G offers tighter thermal headroom at lower current, while CL330SG-G extends maximum brightness capability - both share identical footprint, enable timing, and protection features, enabling scalable design reuse across product variants.

Availability

CL325SG-G is available at Aetrix Electronics and suitable for LCD backlighting, industrial indicator lamps, and automotive interior lighting requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for CL325SG-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 U.S.-based semiconductor company specializing in microcontrollers, analog devices, and interface ICs, with a focus on reliability, longevity, and industrial-grade performance.

The CL325SG-G belongs to Microchip's CL3xx family of high-voltage linear LED drivers, engineered specifically for robust, low-EMI LED biasing in harsh environments where switching noise or complexity must be avoided.

FAQ

What is the maximum output voltage range supported by the CL325SG-G?

The CL325SG-G maintains ±6% current accuracy when output voltage (VOUT) is between 4 V and 15 V. Beyond 15 V - up to its 90 V standoff limit - output current remains functional but accuracy degrades per datasheet curves. For stable 25 mA regulation, keep VOUT within 4–15 V across each driven LED string.

Can the CL325SG-G drive multiple LEDs in series per channel?

Yes, the CL325SG-G can drive series-connected LEDs per channel as long as the total forward voltage stays within the 4–15 V regulated range. For example, six 2.5 V white LEDs (15 V total) are supported at full 25 mA; exceeding 15 V reduces regulation accuracy but does not disable operation.

Does the CL325SG-G require external current-setting components?

No, the CL325SG-G has factory-trimmed internal current references delivering 25 mA per channel with ±6% accuracy - no external resistors, sense elements, or feedback networks are needed. Only a 100 nF ceramic capacitor on VIN is required for stability.

How does the thermal protection in the CL325SG-G behave during overload?

When the CL325SG-G die temperature reaches +135°C, all three output channels shut down immediately. Operation resumes automatically once the junction cools by 30°C (i.e., to ≤105°C). This hysteresis prevents oscillation and ensures safe thermal recovery without external intervention.

Is the CL325SG-G compatible with PWM frequencies above 1 kHz?

Yes, the CL325SG-G supports enable toggling up to 100 kHz, making it suitable for high-frequency PWM dimming. Its typical enable on/off delays (tON = 2.4 µs, tOFF = 800 ns) ensure crisp, low-jitter current switching - critical for flicker-free dimming in visual applications.