led drive Hi1246E

The Hichips Hi1246E is a highly integrated, single-channel linear constant-current LED driver IC from the Hi124XE family, featuring extremely simple peripheral circuitry and wide input voltage compatibility. Designed for cost-sensitive LED lighting, decorative lighting, and general-purpose illumination applications, it delivers precise constant-current output with minimal external components.

Key Specifications:

• Brand: Hichips
• Part Number: Hi1246E
• Package: ESOP-8 (Exposed Pad SOIC-8)
• Packaging: Tape & Reel
• Input Voltage Range (VIN): 3 V to 40 V (built-in 40 V LDO for internal supply)
• Output Current: up to 1 A (set by external CS resistor)
• Constant-Current Accuracy: ≤ ±3% (typ.)
• Dimming Modes: PWM (digital) and analog
• PWM Dimming Frequency: >20 kHz supported
• Dimming Resolution: >1000:1
• Low-Power / Sleep Mode: automatic entry when PWM pin held low >120 ms; auto-restart on PWM high (PWM pin internally pulled up with 100 μA)
• Protection Features: Over-temperature protection with thermal current foldback (OTP + thermal derating)
• Operating Temperature Range: –40 °C to +125 °C
• Topology: Linear constant-current (single-channel, built-in power device)

Typical Applications:

• LED bulbs, tubes, and strips (3–60 V systems)
• Lithium battery-powered LED lighting and flashlights
• Automotive interior / accent lighting (low-voltage segments)
• Landscape, architectural, and signage lighting
• General-purpose constant-current LED drivers requiring simple design and high dimming performance

The Hi1246E combines excellent current regulation, wide VIN range, high-frequency PWM dimming capability, ultra-low standby power, and robust thermal management in an ultra-compact ESOP-8 footprint — making it an ideal choice for space-constrained, cost-optimized, and energy-efficient LED applications across consumer, industrial, and portable lighting segments.