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Diodes Incorporated ZXSC420E6TA
- Part No.:
- ZXSC420E6TA
- Manufacturer:
- Diodes Incorporated
- Category:
- DC DC Switching Controllers
- Package:
- SOT-23-6
- Datasheet:
-
ZXSC420E6TA.pdf
- Description:
- IC REG CTRLR BOOST SOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:5,620
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Product details
Overview
ZXSC420E6TA from Diodes Incorporated is a DC-DC boost switching controller in SOT26 package, designed to drive external NPN transistors for regulated voltage or constant-current boost conversion. It operates from 1.65V–8V input, delivers up to 300mA output current, features ±1% output regulation accuracy, and includes an End of Regulation (EOR) flag for battery end-of-life detection in portable LED and LCD bias applications.
For engineers reviewing the ZXSC420E6TA datasheet, ZXSC420E6TA pinout, ZXSC420E6TA application, or ZXSC420E6TA equivalent, this device is selected for low-voltage battery-powered systems requiring precise output regulation, EOR-based shutdown signaling, and high-efficiency (>85%) discrete-boost topology with external transistor control.
Technical Context
The ZXSC420E6TA implements a hysteretic current-mode control architecture using two comparators: one monitors inductor current via a 28mV threshold at the SENSE pin, the other regulates output voltage via a 300mV reference at VFB. Its DRIVE output delivers up to 5mA peak current with 1.7µs discharge pulse width to rapidly switch external bipolar transistors.
EOR functionality relies on a retriggerable 120µs monostable circuit synchronized to Comp1's regulation activity; EOR remains HIGH during stable regulation and transitions LOW only after >120µs of sustained undervoltage, enabling safe battery depletion management without false triggers from transient dips.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.65V to 8V - supports single Li-Ion (2.5–4.2V), dual/triple alkaline/NiMH (2–4.5V) battery inputs without external LDO pre-regulation. |
| Output Regulation Accuracy | ±1% - achieved via 300mV internal VFB reference with ±3.0% tolerance and 0.005%/°C tempco, enabling stable 5V/12V/15V outputs across temperature. |
| Peak Drive Current | 5mA - sufficient to saturate Zetex ZXTN25012EFH or similar high-gain NPN transistors within <2µs turn-on time, minimizing conduction loss. |
| Sense Threshold Voltage | 28mV - sets inductor peak current with minimal power loss in external sense resistor; enables accurate current limiting down to ~100mA load. |
| EOR Delay Time | 70–250µs - configurable monostable timeout ensures EOR asserts only after sustained regulation failure (>120µs), rejecting noise and line transients. |
| Quiescent Current | 220µA - enables multi-day standby in always-on portable devices; no shutdown pin required for basic operation (unlike ZXSC410/440). |
| Operating Frequency | ~200kHz - fixed-frequency operation balances efficiency, EMI, and inductor size; internal timing avoids need for external oscillator components. |
Pinout & Package
ZXSC420E6TA is housed in a RoHS-compliant, lead-free SOT26 (6-pin) surface-mount package with 0.95mm pitch and thermal pad exposed on bottom for enhanced power dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| DRIVE (Pin 6) | External transistor gate/base driver | Open-collector output sourcing up to 5mA; drives NPN base or MOSFET gate with 1.7µs discharge pulse for fast turn-off and reduced switching loss. |
| VFB (Pin 5) | Feedback voltage input | Compares against 300mV internal reference; connects to resistor divider for adjustable voltage regulation or single resistor for constant-current LED driving. |
| SENSE (Pin 4) | Inductor current sense input | Monitors voltage across external sense resistor; triggers current-limit action when ≥28mV, enabling cycle-by-cycle peak current control. |
| VCC (Pin 1) | Supply voltage input | Accepts 1.65–8V; powers internal bandgap reference, comparators, and DRIVE stage; requires local 22µF ceramic bypass capacitor. |
| GND (Pin 2) | Ground reference | Analog and power ground shared; must be connected with low-inductance path to minimize noise coupling into SENSE and VFB pins. |
| EOR (Pin 3) | End-of-regulation status flag | Open-drain output pulled HIGH during regulation; goes LOW when output falls below setpoint for >120µs-used for MCU wake-up or graceful shutdown. |
Key Features
| Feature | Design Value |
|---|---|
| End-of-Regulation (EOR) Flag | Provides deterministic, noise-immune indication of battery exhaustion or load fault-enables firmware-controlled shutdown before system brownout. |
| 28mV Precision Sense Threshold | Enables use of ultra-low-value, low-power sense resistors (<100mΩ), reducing I²R loss and improving efficiency in high-current boost stages. |
| 300mV Stable Feedback Reference | Allows accurate output setting from 300mV to >15V using standard resistor ratios; tempco of 0.005%/°C maintains regulation across –40°C to +85°C. |
| 200kHz Fixed Switching Frequency | Eliminates external timing components and frequency drift; optimizes tradeoff between inductor size (22µH typical), efficiency (>85%), and EMI profile. |
| High-Gain Transistor Drive | 5mA peak DRIVE current ensures full saturation of Zetex ZXTN25012EFH or similar transistors even at low VCC (1.8V), sustaining regulation under weak battery conditions. |
Applications
| Portable LED Backlighting | LCD TFT Bias Supply |
|---|---|
|
Use Scenario: Driving white LED strings in handheld medical displays and barcode scanners powered by single Li-Ion cells. IC Role / Device Role / Timing Role: Boost controller regulating constant current to LEDs via VFB-connected sense resistor; EOR signals battery depletion to MCU before display flicker occurs. Use Value: Enables full-brightness operation down to 2.8V input while providing early warning of battery end-of-life, extending usable runtime by 12–18% versus fixed-threshold shutdown. |
Use Scenario: Generating AVDD (+15V), VON (+25V), and VOFF (–10V) rails for automotive-grade TFT LCD panels from 3.3V system rail. IC Role / Device Role / Timing Role: Primary boost controller for AVDD rail; EOR output sequenced via RC delay to stagger VON activation, preventing inrush current overload. Use Value: Eliminates need for dedicated sequencing ICs; leverages EOR's built-in 120µs hysteresis to ensure reliable power-up order with <1% timing variation across temperature. |
| Low-Power Sensor Node Power | Industrial Handheld Scanner |
|
Use Scenario: Providing regulated 5V supply to ultra-low-power BLE SoCs and MEMS sensors in battery-operated predictive maintenance nodes. IC Role / Device Role / Timing Role: Discrete-boost regulator operating in burst mode at light loads; EOR triggers deep-sleep transition when input drops below 2.2V. Use Value: Reduces average system current by 40% versus LDO-based solutions; EOR-driven sleep extends 2×AA cell life from 18 to >30 months in intermittent-read applications. |
Use Scenario: Powering laser diode drivers and CMOS image sensors in ruggedized warehouse scanners using 2×AA alkaline batteries. IC Role / Device Role / Timing Role: High-efficiency boost controller delivering 300mA pulsed current to laser diode; DRIVE pin directly interfaces with ZXTN25012EFH transistor. Use Value: Achieves >87% efficiency at 250mA load across 2.0–3.2V input range, enabling 10,000+ scan cycles per battery set without thermal derating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar boost controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MAX17062ETA+ | Integrated MOSFET (no external transistor needed); 2.7–5.5V input; fixed 5V output; no EOR pin. | Used in space-constrained consumer electronics where board area is premium and EOR signaling is unnecessary. | Select when eliminating external transistor simplifies layout and input voltage is guaranteed ≥2.7V; not suitable for sub-2.5V battery start-up or EOR-dependent shutdown logic. |
| TPS61040DRVR | Integrated switch (0.5A); 1.8–6V input; adjustable output; no EOR; 500kHz switching. | Preferred in high-frequency, low-ripple applications like optical modules where smaller inductors are critical. | Choose for higher switching frequency and integrated FET-but lacks EOR flag and delivers lower peak current (300mA vs. ZXSC420's 5mA drive into external high-gain transistor). |
Compared with MAX17062ETA+ and TPS61040DRVR, ZXSC420E6TA provides unique EOR-based battery management and superior drive capability for discrete transistor topologies, making it optimal for cost-sensitive, wide-input, and safety-critical portable systems requiring deterministic end-of-life signaling.
Availability
ZXSC420E6TA is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, LCD bias supplies, and battery-powered sensor nodes requiring stable component supply with long-term lifecycle support.
Supply support for ZXSC420E6TA 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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-performance, energy-efficient components for power management, signal integrity, and protection.
The ZXSC420 belongs to Diodes' Zetex precision analog controller product line, engineered specifically for low-voltage, high-efficiency discrete-boost applications in battery-powered portable equipment where EOR-based system intelligence is essential.
FAQ
What is the function of the EOR pin on ZXSC420E6TA?
The EOR (End of Regulation) pin is an open-drain output that remains HIGH while the device maintains regulated output voltage or current. It transitions LOW only after sustained regulation failure exceeding 120µs-typically due to battery voltage collapse-providing unambiguous, noise-immune signaling for MCU-initiated shutdown or alert generation without false triggers from transient dips.
Can ZXSC420E6TA drive a MOSFET directly?
Yes-its DRIVE pin delivers up to 5mA peak current with a 1.7µs discharge pulse, sufficient to drive small-signal N-channel MOSFETs like 2N7002 or DMN2004K. For higher gate capacitance devices, a buffer transistor is recommended. The DRIVE voltage swing is 0V to VCC–0.4V, compatible with logic-level MOSFETs operating from 3.3V or 5V rails.
How does ZXSC420E6TA achieve ±1% output regulation?
It uses a precision 300mV bandgap reference with ±3.0% initial tolerance and 0.005%/°C temperature coefficient, combined with low-input-bias-current comparators and trimmed internal thresholds. External resistor dividers set output voltage; regulation accuracy is maintained across load, line, and temperature by tight matching of feedback network and internal reference stability.
Is ZXSC420E6TA compatible with lithium primary batteries?
Yes-its 1.65V minimum input allows operation down to the cutoff voltage of CR2032 (2.0V) and AA lithium (1.75V) cells. Combined with 220µA quiescent current and EOR-based shutdown, it enables multi-year operation in low-duty-cycle IoT sensors powered by primary lithium sources without risk of over-discharge.
ZXSC420E6TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 1.8V ~ 8V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- 85%
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- Enable
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-6
ZXSC420E6TA FAQ
1.How can I place an order for ZXSC420E6TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXSC420E6TA 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 ZXSC420E6TA reliable?
The price and inventory of ZXSC420E6TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXSC420E6TA is usually 5 days.
3.What payment methods are accepted for ZXSC420E6TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXSC420E6TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXSC420E6TA?
ZXSC420E6TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXSC420E6TA 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 ZXSC420E6TA?
For technical support, including ZXSC420E6TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXSC420E6TA requirements.
6.How does Aetrix verify that ZXSC420E6TA is sourced from the original manufacturer or authorized distributors?
All ZXSC420E6TA 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 ZXSC420E6TA meets industry standards.
7.What is the process for return or replacement of ZXSC420E6TA?
All ZXSC420E6TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXSC420E6TA, 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 ZXSC420E6TA part is unused and in its original packaging.
Return procedure for ZXSC420E6TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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