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Diodes Incorporated ZXSC400E6TA
- Part No.:
- ZXSC400E6TA
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-6
- Datasheet:
-
ZXSC400E6TA.pdf
- Description:
- IC LED DRIVER RGLTR 50MA SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:15,707
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Product details
Overview
ZXSC400E6TA from Zetex (now Diodes Incorporated) is a voltage-mode boost converter IC designed to drive white LED strings from single-cell lithium-ion or alkaline sources. It features a 300 mV feedback reference, 30 mV current-sense threshold, and external transistor drive for high-efficiency LED current regulation up to 50 mA with <1% load/line variation across 1.8–8 V input. Used in LCD backlighting and portable flashlights.
For engineers reviewing the ZXSC400E6TA datasheet, ZXSC400E6TA pinout, ZXSC400E6TA application, or ZXSC400E6TA equivalent, key selection criteria include its 30 mV sense voltage tolerance, 200 kHz fixed switching frequency, shutdown current <4.5 µA, SOT23-6 package compatibility, and external NPN/MOSFET drive capability for scalable LED string configurations.
Technical Context
The ZXSC400E6TA implements a hysteretic current-mode control architecture using two comparators (ISENSE and VFB), a retriggerable monostable, and a dynamic drive output that sources up to 3.5 mA at VCC−0.4 V to switch external transistors. Its internal 1.22 V bandgap reference ensures stable 300 mV feedback threshold and 30 mV sense threshold with 0.005 %/°C tempco.
Regulation is achieved by modulating the on-time of the external switching transistor based on inductor peak current (via SENSE pin) and output voltage (via VFB pin). The 2 µs discharge pulse on DRIVE ensures fast transistor turn-off, minimizing switching losses during transitions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range | 1.8 V to 8 V - supports single Li-ion (2.7–4.2 V), two alkaline (2.0–3.2 V), or three NiMH cells without input regulation. |
| Feedback Voltage | 300 mV ±3% - sets LED current via single external resistor (e.g., 15 Ω for 20 mA); enables low-loss current sensing. |
| Sense Threshold | 30 mV ±20% - determines peak inductor current; allows use of sub-100 mΩ sense resistors for minimal power loss. |
| Drive Output | 2–5 mA sink/source at VCC−0.4 V - directly drives base of NPN or gate of logic-level MOSFET without buffer stage. |
| Shutdown Current | 4.5 µA max - enables ultra-low-power battery standby mode; STDN pin accepts 0.7 V low or open-circuit disable. |
| Switching Frequency | 200 kHz typical - balances EMI, inductor size, and efficiency; fixed (not adjustable) for predictable layout and filtering. |
| Efficiency | 80% typical at 10–30 mA LED current - achieved via low-VCE(SAT) transistor drive and optimized gate discharge timing. |
Pinout & Package
SOT23-6 package (JEDEC MO-178AA), 1.45 mm max height, 2.8–3.0 mm body width, 0.95 mm pin pitch. RoHS-compliant, Pb-free matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VCC | Positive supply input | Accepts 1.8–8 V; powers internal reference, comparators, and DRIVE output stage. |
| 2 GND | Analog/digital ground | Reference node for all internal thresholds and external sense resistor return path. |
| 3 STDN | Enable/shutdown control | High-impedance input (1 µA typ); >1 V enables operation; ≤0.7 V forces shutdown with <4.5 µA quiescent draw. |
| 4 SENSE | Inductor peak current detection | Compares voltage across external sense resistor to 30 mV internal threshold; triggers monostable to terminate on-time. |
| 5 VFB | Output voltage feedback | Compares divider voltage from LED string to 300 mV reference; regulates average LED current via duty cycle adjustment. |
| 6 DRIVE | External transistor gate/base driver | Push-pull output sourcing up to 3.5 mA; includes 2 µs transient discharge pulse to rapidly turn off external switch. |
Key Features
| Feature | Design Value |
|---|---|
| Single-resistor LED current programming | Uses 300 mV VFB to set precise current (e.g., 20 mA with 15 Ω), eliminating DACs or current mirrors and reducing BOM count. |
| Ultra-low shutdown current | 4.5 µA max enables multi-month battery life in flashlight or sensor nodes where LEDs are intermittently active. |
| Integrated gate/base discharge pulse | 2 µs transient on DRIVE pin reduces transistor storage time, improving efficiency and thermal performance at 200 kHz switching. |
| Wide input voltage range | 1.8–8 V operation supports direct connection to Li-ion, LiFePO₄, or multi-cell alkaline/NiMH without pre-regulation. |
| Open-circuit protection ready | Compatible with Zener clamp across LED string (e.g., 18 V Zener for 6× white LEDs) to limit output overvoltage during LED failure. |
Applications
| White LED Backlighting | Portable LED Flashlights |
|---|---|
|
Use Scenario: Driving 2–4 white LEDs in series for color LCD panels in handheld medical devices or industrial HMIs. IC Role / Device Role / Timing Role: Boost controller regulating constant LED current via external NPN (e.g., FMMT619) and Schottky diode (e.g., ZHCS1000). Use Value: Maintains <1% LED brightness variation across full battery discharge (2.8–4.2 V), ensuring consistent display luminance without software compensation. |
Use Scenario: High-brightness flashlight using 6–8 white LEDs powered by single 18650 Li-ion cell. IC Role / Device Role / Timing Role: Primary LED current regulator driving external MOSFET (e.g., ZXMNS3BM832) in boost topology with 22 µH inductor. Use Value: Delivers stable 20 mA per LED string with 80% efficiency at 3.3 V input, extending runtime beyond discrete linear drivers by >3×. |
| Battery-Powered Instrumentation | Low-Power Status Indicators |
|
Use Scenario: LED status indicators in portable gas detectors or handheld test meters operating from coin-cell or AAA batteries. IC Role / Device Role / Timing Role: Efficient LED driver enabling PWM dimming via STDN pin while maintaining <4.5 µA shutdown current during sleep mode. Use Value: Enables 100-hour+ battery life in always-on monitoring mode with 100 ms flash intervals, leveraging ultra-low quiescent draw and fast wake-up. |
Use Scenario: Single-LED power-on indicator in battery-backed IoT sensors with strict energy budget (e.g., <1 µA avg current). IC Role / Device Role / Timing Role: Constant-current source using 300 mV VFB and 30 mV SENSE to regulate 5 mA LED current with no external op-amp or DAC. Use Value: Achieves 0.5% current accuracy over −40°C to +85°C, eliminating calibration drift seen in resistor-only biasing schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED boost driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX1910ETA+ | Fixed 300 mV VFB but requires external current-sense amplifier; 500 kHz switching; higher quiescent current (25 µA). | Targets higher-frequency, smaller-inductor designs; less suitable for ultra-low-power battery standby. | Choose when board space is constrained and 500 kHz operation is acceptable for EMI filtering. |
| TPS61061DRVR | Integrated 2-A switch; 300 mV VFB; 1.2 MHz switching; 22 µA shutdown current; no external transistor drive. | Eliminates external MOSFET but limits max output voltage to 28 V; not configurable for >8-LED strings. | Choose for simplified BOM in low-to-mid LED count (<6) applications where integrated switch suffices. |
Compared with MAX1910ETA+ and TPS61061DRVR, the ZXSC400E6TA offers superior shutdown current (4.5 µA vs. 22–25 µA), external transistor flexibility for >28 V output, and lower system cost in high-LED-count designs-making it optimal for long-life portable lighting and instrumentation.
Availability
ZXSC400E6TA is available at Aetrix Electronics and suitable for white LED backlighting, portable flashlights, and battery-powered instrumentation requiring stable component supply and long-term manufacturability.
Supply support for ZXSC400E6TA 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
Zetex Semiconductors (acquired by Diodes Incorporated in 2008) specialized in high-performance analog and power management ICs for portable and industrial applications.
The ZXSC400 belongs to Zetex's LED driver product line, engineered specifically for efficient, low-component-count boost conversion in space-constrained battery-powered lighting systems.
FAQ
What external components are mandatory for basic ZXSC400E6TA operation?
The ZXSC400E6TA requires four mandatory external components: an inductor (e.g., 10 µH), an external switching transistor (NPN or MOSFET), a Schottky flyback diode, and a single current-setting resistor connected between VFB and LED cathode. Input/output capacitors (1–4.7 µF ceramic) are strongly recommended for stability and EMI suppression but not strictly mandatory in minimal prototypes.
Can the ZXSC400E6TA drive more than 8 white LEDs in series?
Yes-the ZXSC400E6TA itself imposes no hard LED count limit; output voltage is determined by the external transistor's VCEO/VDSS rating and diode reverse voltage. Reference designs confirm reliable operation with 8 white LEDs (≈24 V output) using FMMT619 (40 V VCEO) and ZHCS1000 (40 V VR). For >8 LEDs, select a transistor/diode rated ≥35 V and verify thermal derating at peak load.
How does dimming work without adding complexity to the bill of materials?
Dimming is implemented via the STDN pin: applying a PWM signal (≥120 Hz, 0.7–VCC amplitude) directly controls LED brightness linearly with duty cycle-no extra ICs, resistors, or filters needed. Alternatively, a DC voltage applied through two resistors (R2/R3) enables analog dimming from 0–100%, using only passive components and leveraging the internal 1 µA SHDN bias current.
Is the ZXSC400E6TA compatible with ceramic capacitors only, or can electrolytics be used?
The ZXSC400E6TA is optimized for low-ESR ceramic output capacitors (1–4.7 µF, X5R/X7R) due to its 200 kHz switching frequency and sensitivity to capacitor impedance. Electrolytic capacitors are not recommended: their high ESR degrades regulation, increases ripple, and risks instability. Input capacitance is optional but-if used-must also be ceramic (1–4.7 µF) for effective high-frequency noise suppression.
ZXSC400E6TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 1.8V
- Voltage - Supply (Max):
- 8V
- Voltage - Output:
- -
- Current - Output / Channel:
- 50mA
- Frequency:
- 200kHz
- Dimming:
- -
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
ZXSC400E6TA FAQ
1.How can I place an order for ZXSC400E6TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXSC400E6TA 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 ZXSC400E6TA reliable?
The price and inventory of ZXSC400E6TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXSC400E6TA is usually 5 days.
3.What payment methods are accepted for ZXSC400E6TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXSC400E6TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXSC400E6TA?
ZXSC400E6TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXSC400E6TA 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 ZXSC400E6TA?
For technical support, including ZXSC400E6TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXSC400E6TA requirements.
6.How does Aetrix verify that ZXSC400E6TA is sourced from the original manufacturer or authorized distributors?
All ZXSC400E6TA 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 ZXSC400E6TA meets industry standards.
7.What is the process for return or replacement of ZXSC400E6TA?
All ZXSC400E6TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXSC400E6TA, 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 ZXSC400E6TA part is unused and in its original packaging.
Return procedure for ZXSC400E6TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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