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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated ZXLD1615ET5TA

Name: ZXLD1615ET5TA
Brand: Diodes Incorporated
SKU: ZXLD1615ET5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXLD1615ET5TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: SOT-23-5 Thin, TSOT-23-5

Datasheet:: ZXLD1615ET5TA.pdf

Description:: IC REG BST FLYBACK ADJ TSOT23-5

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Product details

Overview

ZXLD1615ET5TA from Diodes Incorporated (formerly Zetex Semiconductors) is a PFM-controlled inductive boost converter IC with integrated 30V NDMOS switch and internal peak current sense resistor. It delivers up to 28V output from 2.5V–5.5V input, supports 250mA at 5V or 10mA at 28V, features true analog PWM-adjustable output via the EN pin, and operates in discontinuous conduction mode for LCD/OLED bias generation.

For engineers reviewing the ZXLD1615ET5TA datasheet, ZXLD1615ET5TA pinout, ZXLD1615ET5TA application, or ZXLD1615ET5TA equivalent, this page provides verified technical context, confirmed pin functions, real-world application constraints, and validated alternative options for portable display power management designs.

Technical Context

The ZXLD1615ET5TA implements a self-oscillating PFM control loop with fixed minimum off-time (500ns nominal) and variable on-time governed by internal 320mA peak current limit. Output voltage regulation is achieved by comparing FB pin voltage (1.025V nominal reference) against a resistor divider network.

PWM-based output adjustment is enabled through an internal 4kHz low-pass filter connected to the EN pin: duty-cycle-modulated EN signals produce proportional DC output voltages (V_OUT = D × V_OUT(nom)), supporting both continuous low-ripple and gated modes depending on applied frequency (10kHz–100kHz optimal for analog mode; <1kHz preferred for gating).

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	2.5V to 5.5V - supports single-cell Li-ion, NiMH, or alkaline battery inputs without external LDO pre-regulation.
Max Output Voltage	28V - sufficient for driving OLED anode bias, PIN diode arrays, and high-voltage LCD segment drivers.
Switch Peak Current Limit	320mA - sets maximum energy transfer per cycle; determines inductor sizing and load capability at given V_IN/V_OUT.
Quiescent Current	60µA typical - enables ultra-low-power operation in always-on display subsystems with minimal battery drain.
Shutdown Current	<100nA - ensures near-zero leakage during system sleep, critical for mobile device standby time.
Switching Frequency	Up to 1MHz - allows use of compact 6.8µH–22µH inductors; higher frequencies reduce solution size but increase switching losses.
FB Reference Voltage	1.025V ±0.095V - defines output setpoint accuracy; used with external R1/R2 to scale V_OUT = 1.025V × (1 + R1/R2).

Pinout & Package

Package: TSOT23-5 - low-profile surface-mount package (2.9mm × 2.8mm × 1.0mm) optimized for space-constrained portable electronics.

Pin/Terminal	Circuit Role	Design Meaning
1 LX	Switch drain node	Connects to inductor and Schottky diode anode; carries pulsed 320mA peak current; requires short, low-inductance PCB routing.
2 GND	Power and signal ground reference	Must be tied directly to solid ground plane; serves as return path for switch current and feedback reference.
3 FB	Voltage feedback input	High-impedance node sensing resistive divider output; sets regulated output voltage; sensitive to noise and stray capacitance.
4 EN	Enable and PWM control input	Active-high logic input enabling device operation; also accepts 10kHz–100kHz PWM for analog output scaling or low-frequency gating.
5 VIN	Main power supply input	Accepts 2.5V–5.5V; requires local 4.7µF low-ESR ceramic decoupling capacitor placed adjacent to pin.

Key Features

Feature	Design Value
Integrated 30V NDMOS switch	Eliminates external MOSFET and gate driver, reducing BOM count and layout complexity in compact boost solutions.
Internal PWM low-pass filter (4kHz cutoff)	Enables single-pin analog voltage control without external RC networks, simplifying dynamic brightness or contrast adjustment.
Discontinuous conduction mode operation	Ensures stable regulation across wide load ranges (0–250mA) and input voltages without requiring slope compensation.
120µs EN turn-off delay	Prevents premature shutdown during PWM transitions, maintaining output stability in analog control mode.
Low quiescent current (60µA)	Extends battery life in handheld devices where display bias remains active during UI idle states.

Applications

LCD Bias Generation

OLED Anode Supply

Use Scenario: Providing adjustable positive bias voltage (5V–28V) for TFT-LCD source driver ICs and gate drivers in smartphones and PDAs.

IC Role / Device Role / Timing Role: Primary DC-DC boost regulator generating stable high-voltage rail from single-cell battery; regulated via FB pin and scaled via EN PWM.

Use Value: Enables full-screen brightness control using only one GPIO and two external resistors-no DAC or additional regulators required.

Use Scenario: Supplying programmable anode voltage (12V–25V) for AMOLED displays in wearables and foldable phones.

IC Role / Device Role / Timing Role: High-efficiency, low-noise boost converter operating in gated PWM mode to match panel refresh timing and minimize EMI.

Use Value: Achieves >85% efficiency at 10mA load while maintaining sub-100nA shutdown current-critical for all-day wearable battery life.

PIN Diode Bias Control

Digital Camera Flash LED Driver Support

Use Scenario: Generating precise, low-ripple bias voltage (up to 28V) for RF PIN diode switches in cellular front-end modules.

IC Role / Device Role / Timing Role: Fast-response voltage source synchronized to RF transmit/receive timing via EN pin gating.

Use Value: Delivers 28V at 1mA with <500ns turn-on delay, enabling rapid RF path reconfiguration without voltage droop.

Use Scenario: Supplying auxiliary bias voltage for white LED flash driver ICs requiring >15V headroom in compact camera modules.

IC Role / Device Role / Timing Role: Secondary boost stage delivering 18V/5mA to flash controller VCC pin during burst illumination.

Use Value: Reduces total solution footprint by 40% vs. discrete boost + LDO approach while maintaining ±2% output regulation.

Equivalent & Alternatives

The following parts are listed as comparable options for similar boost converter applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
TPS61040DRVR	Fixed-frequency PWM (1.2MHz), no internal switch current sense; requires external current-sense resistor; higher quiescent current (80µA).	Less suitable for ultra-low-power shutdown scenarios; better for noise-sensitive audio applications due to fixed frequency.	Choose when predictable EMI profile and tighter output ripple are prioritized over battery life.
MAX17222ELT+T	PFM-only operation, 0.5µA shutdown current, but max output voltage limited to 5.25V; no EN-based analog control.	Only viable for low-voltage bias rails; cannot replace ZXLD1615ET5TA in 12V+ OLED or LCD applications.	Use only for sub-5.5V portable sensor bias; not a functional substitute for high-voltage display supplies.

Compared with TPS61040DRVR and MAX17222ELT+T, the ZXLD1615ET5TA uniquely combines high-voltage capability (28V), ultra-low shutdown current (<100nA), and single-pin analog PWM control-making it irreplaceable for space- and power-constrained display bias systems requiring dynamic voltage scaling.

Availability

ZXLD1615ET5TA is available at Aetrix Electronics and suitable for LCD bias generation, OLED anode supply, PIN diode bias control, and digital camera flash support requiring stable component supply across consumer electronics production cycles.

Supply support for ZXLD1615ET5TA 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 acquired Zetex Semiconductors in 2008 and maintains its portfolio of high-performance analog and power management ICs targeting portable and battery-powered applications.

The ZXLD1615 belongs to Zetex's legacy LED/display bias converter product line, specifically engineered for compact, high-efficiency DC-DC conversion in space-constrained handheld devices with stringent power budget requirements.

FAQ

What is the maximum recommended inductor value for stable operation?

The maximum inductor value is constrained by the 5µs nominal maximum on-time: if L × I_PK / V_IN exceeds ~4.8µs, the internal oscillator prevents reaching peak current, limiting output power. For reliable operation at 28V/10mA, inductors should not exceed 22µH; 10µH (e.g., Murata LQH32CN100M02) is the most widely validated value across temperature and load conditions.

Can the ZXLD1615ET5TA drive capacitive loads above 100nF?

Yes, but output stability must be verified per application: the device supports ≥1µF ceramic output capacitors, and larger values (e.g., 2.2µF) improve ripple suppression at low loads. However, capacitance >10µF may cause startup overshoot or slow transient response; a 0.22µF–2.2µF X7R ceramic capacitor placed directly at the LX node is recommended for optimal performance.

How does EN pin PWM frequency affect output accuracy?

Below 10kHz, the internal 120µs turn-off delay dominates the gating period, causing nonlinearity and increased ripple; above 100kHz, propagation delays introduce duty-cycle errors. For best accuracy, maintain EN PWM frequency between 20kHz and 50kHz-this ensures the filter settles fully while minimizing timing-induced gain error in analog control mode.

Is external compensation required for the feedback loop?

No external compensation is required: the ZXLD1615ET5TA uses a fixed-gain, internally compensated voltage control loop optimized for standard resistor-divider networks and typical output capacitor ESR. Stability is guaranteed with 0.22µF–10µF ceramic output capacitors and standard 10µH inductors; adding series resistance to the FB node degrades regulation accuracy and is not recommended.

ZXLD1615ET5TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-23-5 Thin, TSOT-23-5

Packaging:: Tape & Reel (TR)

Product Status:: Active

Function:: Step-Up, Step-Up/Step-Down

Output Configuration:: Positive

Topology:: Boost, Flyback, SEPIC

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 2.5V

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 2.5V

Voltage - Output (Max):: 28V

Current - Output:: 500mA (Switch)

Frequency - Switching:: Up to 1MHz

Synchronous Rectifier:: No

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-23-5

ZXLD1615ET5TA FAQ

1.How can I place an order for ZXLD1615ET5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXLD1615ET5TA 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 ZXLD1615ET5TA reliable?

The price and inventory of ZXLD1615ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1615ET5TA is usually 5 days.

3.What payment methods are accepted for ZXLD1615ET5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1615ET5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXLD1615ET5TA?

ZXLD1615ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXLD1615ET5TA 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 ZXLD1615ET5TA?

For technical support, including ZXLD1615ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1615ET5TA requirements.

6.How does Aetrix verify that ZXLD1615ET5TA is sourced from the original manufacturer or authorized distributors?

All ZXLD1615ET5TA 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 ZXLD1615ET5TA meets industry standards.

7.What is the process for return or replacement of ZXLD1615ET5TA?

All ZXLD1615ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1615ET5TA, 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 ZXLD1615ET5TA part is unused and in its original packaging.

Return procedure for ZXLD1615ET5TA:

1.Submit a request within 90 days.

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

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