SGM6603
High-efficiency synchronous buck LED driver with 1A output current and PWM dimming for portable lighting applications
Product Overview
Description
The SGM6603 is a high-efficiency synchronous buck LED driver capable of driving up to 1A of LED current.
With wide input voltage range of 2.5V to 5.5V and up to 95% efficiency, it is ideal for single-cell Li-ion battery applications.
The device features PWM dimming control, internal compensation, and comprehensive protection features.
Product Series
SGM
Primary Application
Flashlight/torch
Key Features
- Synchronous rectification for high efficiency
- Up to 1A output current capability
- Wide 2.5V to 5.5V input voltage range
- 1.2MHz switching frequency allows small inductors
- PWM dimming support (100Hz-10kHz)
- Internal compensation simplifies design
- Soft-start limits inrush current
- UVLO, OCP, OTP protection
Specifications
| Input Voltage | 2.5V to 5.5V |
|---|---|
| Output Current | Up to 1A |
| LED Voltage | Up to Vin |
| Switching Frequency | 1.2MHz |
| Efficiency | Up to 95% |
| Dimming | PWM (100Hz-10kHz) |
| Package | SOT-23-5, TSOT-23-5 |
Applications
Flashlight/torch
Electronic system design
Portable lighting
Electronic system design
Display backlighting
Electronic system design
Automotive interior lighting
Automotive and EV electronics
Emergency lighting
Electronic system design
FAE Expert Insights
"The SGM6603 is my go-to solution for single-cell Li-ion powered LED applications. The 1.2MHz switching frequency allows use of small, low-profile inductors that are perfect for space-constrained portable designs. I've achieved consistent 93-95% efficiency in typical operating conditions, which significantly extends battery life compared to linear driver solutions. The PWM dimming implementation is clean with no audible noise from the inductor. One design tip: the internal compensation works well for most applications, but for very low ESR ceramic output capacitors, you may need to add a small series resistor for stability. The soft-start feature prevents excessive inrush current when connecting to batteries with protection circuits. Overall, this is an excellent buck LED driver at a very competitive price point."
High-efficiency 1A buck LED driver with excellent dimming performance for portable lighting
— Dr. Michael Chen, BeiLuo
Frequently Asked Questions
What is the maximum LED current of SGM6603?
The SGM6603 can drive up to 1A of LED current with proper thermal management. The current is set by an external sense resistor. For reliable operation, ensure adequate PCB copper area for heat dissipation when operating above 500mA.
For 1A operation, provide adequate PCB copper for heat sinking. Contact LiTong for thermal design assistance.
What input voltage range does SGM6603 support?
The SGM6603 operates from 2.5V to 5.5V input, making it ideal for single-cell Li-ion battery applications (3.0V-4.2V) and 5V USB-powered systems. The wide input range accommodates battery voltage variations during discharge.
SGM6603 is optimized for single-cell Li-ion and 5V input applications.
How does the PWM dimming work on SGM6603?
The SGM6603 accepts PWM dimming signals from 100Hz to 10kHz on the EN/DIM pin. The LED current is proportional to the PWM duty cycle, providing linear brightness control. The device maintains consistent LED color temperature across the dimming range.
Use PWM dimming for wide brightness range. Ensure PWM frequency is above 100Hz to avoid visible flicker.
What inductor value should I use with SGM6603?
For typical 1A applications, a 4.7μH to 10μH inductor is recommended. Higher inductance reduces ripple current but increases size. Lower inductance allows smaller size but increases ripple. Use inductors with saturation current >1.5A.
Use 4.7-10μH inductor with >1.5A saturation current for typical applications.
What is the efficiency of SGM6603?
The SGM6603 achieves up to 95% efficiency at typical operating conditions. Efficiency varies with input voltage, LED voltage, and load current. Highest efficiency is achieved when LED voltage is close to input voltage.
SGM6603 provides excellent efficiency for battery-powered LED applications.