SY7200A Overview
The Silergy SY7200A is a 1MHz fixed-frequency DC/DC boost converter IC specifically optimised for constant current LED driving in series LED string applications. Unlike voltage-mode regulators adapted for LED use, the SY7200A is architected from the ground up to regulate output current rather than voltage — delivering precise, stable LED current across variations in input supply, temperature, and component tolerance. LED current is set by a single external sense resistor, eliminating the need for complex feedback networks and keeping external component count to a minimum. The device supports series strings of up to eight white LEDs with a maximum output voltage of 30V, covering the majority of portable display backlight and general LED lighting applications from a single compact IC.
Silergy’s SY7200A operates at a fixed switching frequency of 1MHz — significantly higher than many comparable LED driver ICs — which allows the use of small-value ceramic capacitors and chip inductors rather than larger electrolytic capacitors or wire-wound inductors. This combination of small passive values directly reduces PCB area, component height, and total BOM cost in space-constrained designs such as smartphone backlights, portable display modules, and wearable devices. An EN/PWM dimming pin accepts external PWM signals at frequencies from 20kHz up to 1MHz, enabling smooth, flicker-free LED brightness control across a wide dimming range — critical for display applications where PWM frequencies below 20kHz can cause visible flicker at lower brightness settings.
The SY7200A accepts a wide input voltage range of 2.8V to 30V, accommodating single-cell Li-Ion batteries (down to approximately 3V discharged), multi-cell packs, USB power inputs, and regulated 5V or 12V supply rails within a single design. Operating temperature spans -40°C to 85°C, covering consumer electronics and light industrial temperature environments. The device is housed in the compact SOT-23-6 package, minimising board space in portable and handheld product designs. The SY7200A is certified RoHS compliant and halogen-free. ABL Semi stocks the SY7200A as a fully authentic, original Silergy factory product with flexible MOQ and compliance documentation for UK and European customers.
Key Specifications
| Parameter | Value |
|---|---|
| Device Type | DC/DC Boost Constant Current LED Driver |
| Input Voltage Range (VIN) | 2.8V to 30V |
| Maximum Output Voltage | 30V |
| Maximum LED String Length | Up to 8 white LEDs in series |
| LED Current Setting | Single external sense resistor |
| Switching Frequency | 1MHz (fixed) |
| EN/PWM Dimming Frequency Range | 20kHz to 1MHz |
| External Passive Requirements | Small ceramic capacitors and chip inductor (1MHz optimised) |
| Operating Temperature (TA) | -40°C to +85°C |
| Compliance | RoHS compliant, halogen-free |
| Package | SOT-23-6 |
Applications
The SY7200A is designed for compact, battery-powered, and supply-rail LED driving applications where precise constant current regulation, small passive component sizes, and PWM dimming capability are required in a minimal PCB footprint. Primary application areas include smartphone and tablet display backlights, portable media player LED panels, e-reader frontlight drivers, handheld instrument display backlights, and USB-powered LED lighting modules. The device is equally applicable in wearable device display LED drivers, automotive interior accent LED supplies, and small industrial status indicator arrays, where its wide 2.8V–30V input range, 1MHz switching frequency, and SOT-23-6 package enable compact, cost-efficient constant current LED control with high-frequency PWM dimming support.
Pin-to-Pin Compatible Alternatives
The SY7200A’s SOT-23-6 package and boost constant current LED driver architecture are shared with several widely used LED driver ICs from established Western and Japanese suppliers, enabling a direct footprint substitution to reduce BOM cost and diversify supply without PCB layout changes.
| Reference Part Number | Original Manufacturer | Why Choose SY7200A |
|---|---|---|
| MAX1848EUT | Analog Devices (Maxim) | Boost LED driver in SOT-23-6 for white LED strings; SY7200A offers a wider 2.8V–30V input range and higher 1MHz switching frequency for smaller passives at a lower unit cost from ABL Semi |
| LM3410XMFX | Texas Instruments | 1.6MHz boost LED driver in SOT-23-6; SY7200A provides comparable 1MHz high-frequency operation with equivalent series LED string capability and a competitive price point for volume procurement |
| AAT1401IGU-6-T1 | Advanced Analogic Technologies | Boost white LED driver in SOT-23-6; SY7200A delivers a wider input voltage range and high-frequency PWM dimming support (up to 1MHz) in the same compact package at reduced cost |
| NCP5030MUT2G | onsemi | LED boost driver in small outline package; SY7200A provides equivalent series LED string drive capability with 1MHz switching enabling smaller ceramic passives in space-constrained designs |
| MIC2870YFT | Microchip (Micrel) | Boost LED driver in SOT-23-6 for backlight applications; SY7200A offers a broader 2.8V–30V input range supporting everything from single-cell Li-Ion to 12V regulated rails in a single design |
Frequently Asked Questions
Is SY7200A RoHS compliant?
Yes. The SY7200A is fully RoHS compliant and halogen-free. Silergy manufactures the SY7200A in accordance with EU RoHS Directive 2011/65/EU, ensuring the device is free from restricted hazardous substances including lead and mercury. ABL Semi can provide full compliance and trade documentation upon request to support UK and European regulatory and procurement requirements.
What are the pin-to-pin replacements for SY7200A?
The SY7200A is a footprint-compatible alternative to several widely used SOT-23-6 boost LED driver ICs including the Analog Devices MAX1848EUT, TI LM3410XMFX, onsemi NCP5030, and Microchip MIC2870YFT — all sharing the same compact 6-pin SOT-23 package and constant current boost LED driver topology. Refer to the compatibility table above for a detailed comparison.
What is the minimum order quantity (MOQ) for SY7200A?
ABL Semi offers flexible MOQ for SY7200A, supporting both prototype quantities and mass production orders. Contact us for current stock and pricing.
What package options are available for SY7200A?
The SY7200A is available in the SOT-23-6 (6-pin small outline transistor) surface-mount package. This compact, industry-standard footprint is widely used for single-IC LED driver solutions in portable and space-constrained PCB designs, and is compatible with equivalent footprints used by comparable LED driver ICs from Maxim, TI, and onsemi. Contact ABL Semi to confirm current stock availability.
How is LED current set on the SY7200A, and what is the formula for selecting the sense resistor?
The SY7200A regulates LED current by monitoring the voltage across an external current sense resistor (RSET) placed in series with the LED string return path. The regulated LED current is determined by the formula: ILED = VREF / RSET, where VREF is the internal reference voltage of the SY7200A feedback pin (typically 200mV — confirm in the Silergy datasheet for the exact value). For example, to set a 20mA LED current: RSET = 0.2V / 0.020A = 10Ω. A 1% tolerance resistor is recommended to achieve accurate LED current matching across production batches. The resistor power rating must accommodate the sense voltage times the LED current — for 20mA, power dissipation is only 4mW, so a standard 0402 or 0603 chip resistor is appropriate.
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