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Diodes Incorporated ZXSC100X8TA
- Part No.:
- ZXSC100X8TA
- Manufacturer:
- Diodes Incorporated
- Category:
- DC DC Switching Controllers
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ZXSC100X8TA.pdf
- Description:
- IC REG CTRLR BOOST 8MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,378
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Product details
Overview
ZXSC100X8TA from Diodes Incorporated is a non-synchronous PFM DC-DC controller IC designed for single-cell NiCd/NiMH battery applications requiring ultra-low-voltage startup and adjustable boost conversion. It starts under full load at 0.926 V input, delivers up to 2 W output power with external transistor, achieves 82% efficiency at 1 V input, and supports programmable output voltage via FB pin (730 mV reference) - deployed in portable medical equipment and GPS receivers.
For engineers reviewing the ZXSC100X8TA datasheet, ZXSC100X8TA pinout, ZXSC100X8TA application, or ZXSC100X8TA equivalent, key selection criteria include minimum startup voltage (0.926 V), quiescent current (150 µA), feedback reference (730 mV), ISENSE threshold (25 mV), and SO-8 package compatibility with discrete external switching transistor implementation.
Technical Context
The ZXSC100X8TA implements pulse-frequency modulation (PFM) control with two comparators: Comp1 triggers switching based on FB voltage crossing 730 mV, while Comp2 disables the driver when ISENSE exceeds 25 mV - enabling peak-current-limited, discontinuous-conduction-mode operation. A monostable extends TOFF to ≥1.7 µs ensuring inductor discharge before next cycle.
Startup and shutdown use built-in hysteresis (80 mV) around 1.06 V threshold; internal drive current is set by RE pin referenced to VCC − 25 mV; VDRIVE supplies base current to external NPN transistor with typical 5–10 mA capability and VCC − 0.17 V saturation voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Startup Voltage | 0.926 V min - enables operation from depleted single NiMH/NiCd cells without brown-out reset. |
| Feedback Reference | 730 mV ±22 mV - sets output voltage via external resistor divider; defines regulation accuracy and load transient response. |
| ISENSE Threshold | 25 mV typ - determines peak inductor current limit; directly sets maximum output power with RSENSE. |
| Quiescent Current | 150 µA typ at no load - minimizes battery drain during standby in always-on portable devices. |
| Operating Frequency | 200 kHz recommended - fixed-frequency design not used; actual switching frequency varies dynamically with load (PFM). |
| VDRIVE Output | VCC − 0.17 V @ 5 mA - ensures sufficient base drive for external NPN switch while limiting saturation loss. |
| Max Junction Temp | 150 °C - constrains thermal design margin for SO-8 package in high-ambient portable enclosures. |
Pinout & Package
ZXSC100X8TA is housed in an SO-8 package with lead-free, RoHS-compliant "Green" molding compound. Pin assignments are validated per Diodes DS33613 Rev. 6–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 EM | Emitter monitor of internal drive transistor | Connected to RE in low-power configs; left unconnected in high-power designs to avoid current path conflict. |
| 2 BAS | Base assist for external PNP boost transistor | Enables higher base drive current in >100 mA applications using external PNP (e.g., FMMT617). |
| 3 RE | Drive current sense input | Sets internal drive current via external resistor; reference = VCC − 25 mV. |
| 4 VCC | Main supply input | Accepts 0.926–3.5 V; powers internal circuitry and defines all voltage references. |
| 5 ISENSE | Inductor current sense input | Triggers switch-off when external sense resistor develops ≥25 mV - implements cycle-by-cycle current limiting. |
| 6 FB | Output voltage feedback input | Compares against 730 mV reference; adjusts duty cycle to regulate output via external resistive divider. |
| 7 GND | Power and signal ground reference | Common return for VCC, ISENSE, FB, and EM; requires low-impedance PCB connection to minimize noise. |
| 8 VDRIVE | External transistor base drive output | Supplies controlled current to base of external NPN; max 10 mA drive capability. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low startup voltage | 0.926 V enables reliable operation from aging single-cell batteries in cordless phones and palmtops. |
| Adjustable output down to VCC | Non-synchronous architecture allows output voltage to be set equal to input - useful for battery backup pass-through mode. |
| Programmable peak-current limit | 25 mV ISENSE threshold + external RSENSE enables precise output power tuning across 100 mA–1.2 A range. |
| Low-quiescent-current PFM control | 150 µA ICC ensures >1-year shelf life in electronic toothbrushes and pagers with no-load standby. |
| SO-8 thermal and layout optimization | 780 mW power dissipation rating at 25°C supports compact PCB layouts with minimal copper area for heat spreading. |
Applications
| Cordless Telephones | GPS Receivers |
|---|---|
|
Use Scenario: Powering RF front-end and baseband ICs from a single NiMH cell with rapidly decaying voltage during talk time. IC Role / Device Role / Timing Role: Primary DC-DC controller managing boost conversion and cycle-by-cycle current limiting to sustain 3.3 V rail. Use Value: Maintains stable 3.3 V output down to 0.926 V input, extending usable battery life by 18% versus fixed-threshold alternatives. |
Use Scenario: Supplying 3.3 V to GPS baseband processor and RF LNA under cold-weather battery voltage sag. IC Role / Device Role / Timing Role: Adjustable boost controller regulating output while rejecting input ripple from noisy battery sources. Use Value: 82% efficiency at 1 V input preserves battery capacity during extended outdoor navigation sessions. |
| Digital Cameras | Portable Medical Equipment |
|
Use Scenario: Delivering 5 V flash LED driver supply and 3.3 V sensor interface rail from one AA NiMH cell. IC Role / Device Role / Timing Role: Dual-rail controller supporting separate inductor paths with independent ISENSE/FB networks. Use Value: Programmable VFB and ISENSE thresholds allow simultaneous optimization of flash brightness and sensor SNR. |
Use Scenario: Providing regulated 3.3 V for microcontroller and analog front-end in handheld glucose meters. IC Role / Device Role / Timing Role: Low-noise, low-IQ boost controller ensuring accurate ADC reference stability during measurement cycles. Use Value: 150 µA quiescent current extends battery life to >12 months in intermittent-use clinical devices. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar DC-DC controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ZXSC100N8TA | Same die in SO-8 package; identical electrical specs; active status vs. X8TA's obsolescence. | Direct drop-in replacement with same pinout, layout, and BOM - no redesign required. | Select for new designs requiring long-term supply continuity and full manufacturer support. |
| MAX17062ETA+ | Integrated synchronous boost (no external transistor); 0.7 V startup; 2 MHz fixed-frequency PWM. | Better light-load efficiency but higher IQ (25 µA vs. 150 µA); limited to ≤500 mA output due to integrated FET. | Prefer for space-constrained, lower-power applications where board area > battery life is prioritized. |
Compared with ZXSC100X8TA, ZXSC100N8TA offers identical functionality with guaranteed availability, while MAX17062ETA+ trades external transistor flexibility and ultra-low-VIN robustness for smaller footprint and higher switching frequency - making it suitable only for sub-500 mA, PCB-area-sensitive designs.
Availability
ZXSC100X8TA is available at Aetrix Electronics and suitable for portable medical equipment, GPS receivers, and digital cameras requiring stable component supply despite its obsolete status - supported via legacy inventory and cross-reference fulfillment.
Supply support for ZXSC100X8TA 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 semiconductor company specializing in discrete, analog, and mixed-signal ICs for power management, signal integrity, and protection applications.
The ZXSC100 series belongs to Diodes' low-voltage DC-DC controller product line, engineered specifically for energy-constrained single-cell battery systems where startup reliability and quiescent current dominate system runtime.
FAQ
Is ZXSC100X8TA still in production?
No - ZXSC100X8TA is officially obsolete per Diodes' ordering information table. Its active replacement is ZXSC100N8TA in SO-8 package. Aetrix Electronics maintains legacy stock and provides verified cross-reference support to ensure continuity for existing designs.
What external components are mandatory for ZXSC100X8TA operation?
Mandatory components include: an external NPN switching transistor (e.g., FMMT617), Schottky diode (e.g., ZHCS1000), inductor (22 µH typical), input/output capacitors, and two resistors forming the FB voltage divider. The ISENSE sense resistor and optional RE resistor are also required for current limiting and drive optimization.
Can ZXSC100X8TA regulate output voltage below its input voltage?
No - the ZXSC100X8TA is a boost-only controller. However, its non-synchronous architecture allows the output to be programmed down to the input voltage level (VOUT ≥ VCC) by setting the FB divider ratio to unity, effectively enabling pass-through mode when input rises near target output.
Why does ZXSC100X8TA use PFM instead of PWM control?
PFM enables superior light-load efficiency by reducing switching frequency as load decreases - critical for battery-powered devices with intermittent operation. At 150 µA quiescent current and variable-frequency operation, it avoids fixed PWM gate-drive losses that would dominate standby power consumption.
ZXSC100X8TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Type:
- Transistor Driver
- Function:
- Step-Up
- Output Configuration:
- Positive
- Topology:
- Boost
- Number of Outputs:
- 1
- Output Phases:
- 1
- Voltage - Supply (Vcc/Vdd):
- 0.98V ~ 3.5V
- Frequency - Switching:
- 200kHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- No
- Clock Sync:
- No
- Serial Interfaces:
- -
- Control Features:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-MSOP
ZXSC100X8TA FAQ
1.How can I place an order for ZXSC100X8TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXSC100X8TA 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 ZXSC100X8TA reliable?
The price and inventory of ZXSC100X8TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXSC100X8TA is usually 5 days.
3.What payment methods are accepted for ZXSC100X8TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXSC100X8TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXSC100X8TA?
ZXSC100X8TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXSC100X8TA 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 ZXSC100X8TA?
For technical support, including ZXSC100X8TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXSC100X8TA requirements.
6.How does Aetrix verify that ZXSC100X8TA is sourced from the original manufacturer or authorized distributors?
All ZXSC100X8TA 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 ZXSC100X8TA meets industry standards.
7.What is the process for return or replacement of ZXSC100X8TA?
All ZXSC100X8TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXSC100X8TA, 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 ZXSC100X8TA part is unused and in its original packaging.
Return procedure for ZXSC100X8TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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