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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > DC DC Switching Controllers

Diodes Incorporated ZXSC100N8TA

Name: ZXSC100N8TA
Brand: Diodes Incorporated
SKU: ZXSC100N8TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXSC100N8TA

Manufacturer:: Diodes Incorporated

Category:: DC DC Switching Controllers

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: ZXSC100N8TA.pdf

Description:: IC REG CTRLR BOOST 8SOIC

Quantity:: RFQ Add To RFQ list

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Inventory:2,980

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Product details

Overview

ZXSC100N8TA from Diodes Incorporated is a non-synchronous PFM DC-DC controller IC designed for single-cell NiCd/NiMH battery-powered boost conversion. It starts up under full load at 0.926 V input, delivers adjustable output voltage (≥V_IN) via FB pin resistive divider, and achieves 82% efficiency at 1 V input. Used with external NPN switching transistor and Schottky diode, it enables compact, low-quiescent (150 µA) step-up solutions up to 2 W.

For engineers reviewing the ZXSC100N8TA datasheet, ZXSC100N8TA pinout, ZXSC100N8TA application, or ZXSC100N8TA equivalent, key selection criteria include minimum startup voltage (0.926 V), feedback reference (730 mV), ISENSE current-sense threshold (25 mV), quiescent current (150 µA), and SO-8 package compatibility with discrete power stage layout.

Technical Context

The ZXSC100N8TA implements pulse-frequency modulation with constant off-time (TOFF = 1.7–3 µs) and variable switching frequency dependent on load. Its internal architecture includes two comparators: Comp1 (FB ≥ 730 mV disables drive) and Comp2 (ISENSE ≥ 25 mV forces turn-off), coordinated by an AND gate and monostable to ensure minimum discharge time and prevent shoot-through.

Startup and shutdown are controlled by a hysteresis circuit (80 mV) operating between 1.01 V (turn-on) and 0.93 V (turn-off). The RE pin sets base drive current via an internal 25 mV below VCC reference, while VDRIVE supplies up to 10 mA to the external transistor base-scalable further using an external PNP when BAS and RE pins are configured per Note 2.

Key Specifications

Parameter	Value and Actual Design Meaning
Startup Voltage	0.926 V - enables operation directly from depleted NiMH/NiCd cells without brown-out reset
Feedback Reference	730 mV ±22 mV - sets output voltage via external resistor divider (VOUT = 730 mV × (1 + RA/RB))
Current Sense Threshold	25 mV - defines peak inductor current limit via external sense resistor (IPK ≈ 25 mV / RSENSE)
Quiescent Current	150 µA - minimizes no-load battery drain in always-on portable devices
Drive Output Current	5–10 mA - sufficient to saturate small-signal NPN transistors (e.g., FMMT617) without external boost
Operating Temperature	0 °C to +70 °C - validated for consumer-grade portable electronics environments
Max Output Voltage	20 V - limited by external switching transistor breakdown (e.g., FMMT617 V_CEO)

Pinout & Package

ZXSC100N8TA is housed in an SO-8 package (4.9 mm × 6.0 mm, 1.27 mm pitch), RoHS-compliant with lead-free finish and green molding compound.

Pin/Terminal	Circuit Role	Design Meaning
1 EM	Emitter monitor of internal drive transistor	Connected to RE in low-power configurations; left open in high-current designs to avoid saturation loss
2 BAS	Base assist enable	Drives external PNP to augment VDRIVE current when higher base drive is needed for power transistors
3 RE	Drive current sense input	Sets internal base drive current via resistor to VCC; reference is 25 mV below VCC
4 VCC	Main supply input	Accepts 0.926–3.5 V; powers internal circuitry and serves as reference for RE and VDREF
5 ISENSE	Inductor current sense input	Detects peak switch current via external sense resistor; trips at 25 mV to terminate on-time
6 FB	Output voltage feedback input	Compares divided output against 730 mV reference to regulate output voltage
7 GND	Analog and power ground	Common return for internal references, comparators, and external sense components
8 VDRIVE	External transistor base drive output	Supplies 5–10 mA sink current to NPN base; fast turn-off (<20 ns) minimizes conduction loss

Key Features

Feature	Design Value
Ultra-low startup voltage	0.926 V enables reliable operation from single NiMH/NiCd cells down to end-of-discharge
Programmable output range	Adjustable from V_IN to 20 V using only two external resistors on FB pin
Integrated current limiting	25 mV ISENSE threshold provides precise, temperature-stable peak current control
Low quiescent consumption	150 µA ICC ensures >1-year shelf life in battery-backed devices with infrequent wake-up
SO-8 thermal performance	780 mW power dissipation rating supports 2 W output with proper PCB copper area and airflow

Applications

Portable Medical Devices

Digital Cameras

Use Scenario: Powering LED flash and image sensor bias rails from a single AA NiMH cell.

IC Role / Device Role / Timing Role: DC-DC controller managing PFM-based boost conversion with dynamic load response to burst-mode flash pulses.

Use Value: Maintains stable 3.3 V/5 V output during 1.2 A flash current peaks while drawing only 150 µA between shots.

Use Scenario: Generating 5 V for CCD/CMOS sensor and 3.3 V for microcontroller from one 1.2 V NiMH cell.

IC Role / Device Role / Timing Role: Adjustable dual-rail controller enabling independent voltage programming via FB and ISENSE feedback paths.

Use Value: Eliminates need for separate LDOs or charge pumps, reducing BOM count and PCB area in space-constrained camera modules.

GPS Receivers

Electronic Toothbrushes

Use Scenario: Supplying 3.3 V RF front-end and baseband processor from a single-cell rechargeable pack.

IC Role / Device Role / Timing Role: Low-noise PFM controller minimizing switching interference in sensitive GNSS band reception.

Use Value: Achieves 82% efficiency at 1 V input and 50 mA load, extending runtime without compromising RF sensitivity.

Use Scenario: Boosting voltage for motor driver and LED indicators in cordless oral care devices.

IC Role / Device Role / Timing Role: High-reliability boost controller supporting intermittent 500 ms motor bursts and continuous indicator lighting.

Use Value: Sustains regulated output during 1.2 A motor start-up transients while maintaining <100 mV output ripple at 3.3 V.

Equivalent & Alternatives

The following parts are listed as comparable options for similar DC-DC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MAX1706AESA+	Higher minimum input (0.9 V vs. 0.926 V); integrated MOSFET; fixed 3.3 V/5 V outputs only	Lacks adjustable output and external transistor flexibility; better for fixed-voltage, lower-BOM designs	Choose MAX1706A if system requires integrated power switch and fixed output, not programmable boost with discrete FETs
TPS61099YFFR	Lower quiescent current (300 nA vs. 150 µA); synchronous rectification; 0.7 V min input	Superior light-load efficiency but requires external compensation and lacks ISENSE-based current limiting	Choose TPS61099YFFR for ultra-low-power IoT sensors where standby current dominates lifetime, not peak efficiency

Compared with MAX1706AESA+ and TPS61099YFFR, ZXSC100N8TA uniquely balances ultra-low startup voltage, external transistor control, and analog current limiting-making it optimal for cost-sensitive, discrete high-efficiency boost converters in consumer portables.

Availability

ZXSC100N8TA is available at Aetrix Electronics and suitable for cordless telephones, portable medical equipment, and GPS receivers requiring stable component supply across long production lifecycles and varying battery chemistries.

Supply support for ZXSC100N8TA 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, cost-optimized power management and signal integrity solutions.

ZXSC100N8TA belongs to the ZXSC100 series of single-cell boost controllers, engineered specifically for ultra-low-voltage battery-powered consumer electronics where startup reliability and discrete power stage flexibility are critical.

FAQ

What is the minimum input voltage required for ZXSC100N8TA to start regulation?

The ZXSC100N8TA starts regulation under full load at 0.926 V, verified per DS33613 Rev. 6–2 Section 3. This is achieved using an internal hysteresis-controlled startup circuit that activates at VCC = 1.01 V and remains active down to 0.926 V. Below this threshold, the device ceases switching and enters ultra-low-current standby mode.

How is output voltage adjusted, and what is the role of the FB pin?

Output voltage is set by a resistive divider from VOUT to GND, with the midpoint connected to the FB pin. The internal comparator regulates VOUT so that the FB voltage equals 730 mV (typical), yielding VOUT = 730 mV × (1 + RA/RB). RA and RB must be selected to deliver ≥100 nA to FB while minimizing quiescent current draw from the battery.

Can ZXSC100N8TA drive a MOSFET instead of a bipolar transistor?

No-ZXSC100N8TA's VDRIVE output is optimized for bipolar transistor base drive (5–10 mA sink), not MOSFET gate charging. Its 10 mA drive capability and lack of high-side gate driver logic make it incompatible with standard N-channel MOSFETs. For MOSFET-based designs, Diodes recommends the AP3012 or AP3015 series.

What external components are mandatory for basic operation?

Mandatory components include: (1) an external NPN switching transistor (e.g., FMMT617), (2) a Schottky diode (e.g., ZHCS1000), (3) an inductor (22 µH typical), (4) input/output capacitors (low-ESR tantalum or ceramic), and (5) two resistors for FB feedback. The RE-to-VCC resistor is optional but recommended for drive current optimization.

ZXSC100N8TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm 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-SO

ZXSC100N8TA FAQ

1.How can I place an order for ZXSC100N8TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXSC100N8TA 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 ZXSC100N8TA reliable?

The price and inventory of ZXSC100N8TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXSC100N8TA is usually 5 days.

3.What payment methods are accepted for ZXSC100N8TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXSC100N8TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXSC100N8TA?

ZXSC100N8TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXSC100N8TA 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 ZXSC100N8TA?

For technical support, including ZXSC100N8TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXSC100N8TA requirements.

6.How does Aetrix verify that ZXSC100N8TA is sourced from the original manufacturer or authorized distributors?

All ZXSC100N8TA 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 ZXSC100N8TA meets industry standards.

7.What is the process for return or replacement of ZXSC100N8TA?

All ZXSC100N8TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXSC100N8TA, 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 ZXSC100N8TA part is unused and in its original packaging.

Return procedure for ZXSC100N8TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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