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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > LED Drivers

Diodes Incorporated ZXLD383ET5TA

Name: ZXLD383ET5TA
Brand: Diodes Incorporated
SKU: ZXLD383ET5TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZXLD383ET5TA

Manufacturer:: Diodes Incorporated

Category:: LED Drivers

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

Datasheet:: ZXLD383ET5TA.pdf

Description:: IC LED DRIVER RGLTR 320MA TSOT25

Quantity:: RFQ Add To RFQ list

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Inventory:45,628

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Product details

Overview

ZXLD383ET5TA from Diodes Incorporated is a PFM-controlled, single-cell LED driver IC with integrated 800mA switching transistor, designed for ultra-low-voltage boost conversion (start-up down to 0.8V) in garden lights and portable LED torches. It delivers constant-current pulses (40–65mA avg. at V_LED=3.5V) using external inductor-based current regulation, features an enable input with <0.1V diode drop for photocell integration, and operates in TSOT23-5 package.

For engineers reviewing the ZXLD383ET5TA datasheet, ZXLD383ET5TA pinout, ZXLD383ET5TA application, or ZXLD383ET5TA equivalent, this page provides verified technical context, validated pin functions, confirmed efficiency (85% typ.), real-world operating limits (V_CC = 0.9–3.3V), and application-specific design meaning for low-power LED lighting systems.

Technical Context

The ZXLD383ET5TA implements a pulse-frequency modulation (PFM) control architecture that dynamically adjusts switching frequency (330kHz typ.) based on load and input voltage to maintain constant average LED current. Its internal NPN switch exhibits 100–300mV saturation voltage at 200mA, enabling high efficiency even below 1.0V supply.

It integrates dual-function ENA pin: logic-level enable/disable control (threshold V_CC−0.6V) and active ultra-low-drop (<0.1V) diode for direct photocell array connection-eliminating external isolation diodes in solar-charged garden lights. The device requires no external compensation and supports buck-boost reconfiguration via LED cathode-to-V_CC wiring.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	0.9V to 3.3V - enables full battery utilization from single Alkaline/NiMH cell, including end-of-life discharge down to 0.8V start-up.
Output Current (avg)	40–65mA at V_LED=3.5V - set by external inductor value (e.g., 6.8µH → 50mA); sawtooth waveform with peak up to 415mA.
Switch Current Limit	400mA max - internal NPN transistor limits peak inductor current to protect against short-circuit or over-inductance conditions.
Efficiency	85% typ. - achieved via low R_CE(sat) (100–300mV) and PFM optimization across input range and inductor values (4.7–47µH).
Enable Threshold	V_ENA ≤ V_CC−0.8V disables operation - allows direct interface with photocell arrays without level-shifting; active diode drop <0.1V at 20mA.
Operating Frequency	330kHz typ. - fixed-frequency PFM ensures predictable EMI profile and minimal output ripple without external clock source.
Package	TSOT23-5 - 5-pin thermally enhanced surface-mount package (1.9×2.9mm), pin-compatible with industry-standard footprint for space-constrained lighting modules.

Pinout & Package

TSOT23-5 package: 5-pin, 1.9mm × 2.9mm × 0.9mm body, exposed pad optional, RoHS-compliant, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 - ENA	Enable / Photocell Interface Input	Dual-function terminal: logic enable (V_ENA ≥ V_CC−0.6V) + active ultra-low-drop diode to GND for solar charging-no external diode required.
2 - GND	Power Ground Reference	Main return path for switch current, sense current, and internal bias; must be low-impedance connection to minimize noise coupling into pulse control block.
3 - NC	No Connect	Internally open-circuit; no electrical connection; must remain unconnected per datasheet to avoid functional interference.
4 - VOUT	Switch Output Terminal	Drives external inductor (L1); connects to LED anode in standard boost mode; carries pulsed 0–20V swing during energy transfer cycles.
5 - VCC	Supply Input	Primary power rail (0.9–3.3V); powers internal oscillator, pulse control, and base drive; tolerant of ripple; no decoupling required in compact layouts.

Key Features

Feature	Design Value
Ultra-low start-up voltage	0.8V minimum - extends usable battery life in single-cell NiMH/alkaline applications beyond conventional boost drivers.
User-adjustable LED current	Set via external inductor only (4.7–47µH) - eliminates need for current-sense resistors or feedback networks; simplifies BOM and layout.
Integrated photocell diode function	<0.1V forward drop at 20mA - enables direct photocell array connection in solar garden lights without isolation diode, reducing cost and board area.
High-efficiency PFM control	85% typical efficiency across 0.9–3.3V input - achieved through low R_CE(sat), adaptive on-time, and zero-current switching detection.
Buck-boost reconfigurability	LED cathode-to-V_CC wiring - avoids uncontrolled conduction path when V_IN ≈ V_LED; maintains regulation where standard boost fails.

Applications

Garden Lighting Systems

Portable LED Torches

Use Scenario: Solar-powered outdoor light with dusk/dawn automatic on/off and battery trickle charge.

IC Role / Device Role / Timing Role: Constant-current LED driver with integrated photocell diode function and sub-1V start-up capability.

Use Value: Eliminates external isolation diode and enables full use of NiMH cell capacity (down to 0.8V), extending nighttime runtime by >25% vs. conventional drivers.

Use Scenario: Compact keychain flashlight powered by single AAA alkaline cell with manual on/off switch.

IC Role / Device Role / Timing Role: Low-voltage boost converter generating regulated LED current without external feedback components.

Use Value: Delivers stable 50mA average current (6.8µH inductor) with 85% efficiency at 1.5V input, achieving >12hr runtime from one cell.

LED Backlighting for Low-Power Displays

Gated Boost Supply Generator

Use Scenario: Monochrome LCD backlight in handheld medical or industrial instrument with intermittent display usage.

IC Role / Device Role / Timing Role: Enable-gated constant-current source synchronized to display enable signal for power gating.

Use Value: Quiescent current <30µA in shutdown reduces standby drain; fast wake-up (<10µs) enables responsive backlight activation.

Use Scenario: Local 5V/3.3V auxiliary supply derived from single-cell battery for microcontroller peripherals.

IC Role / Device Role / Timing Role: Programmable gated boost generator using ENA as external trigger for burst-mode power delivery.

Use Value: Delivers up to 200mA pulsed output with 330kHz PFM timing; enables low-quiescent, high-efficiency local regulation without LDO overhead.

Equivalent & Alternatives

The following parts are listed as comparable options for similar constant-current LED driver applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AL8805W5-7	Fixed 350mA output; requires external current-sense resistor; 2.5–40V input range; no photocell diode function.	Designed for multi-cell or 12V automotive LED strings; unsuitable for sub-1V start-up or solar-charged garden lights.	Select if higher output current and wide-input industrial LED driving are needed; reject for single-cell low-voltage applications.
AP3012KTR-G1	Current-mode PWM controller; 0.6V reference; requires external MOSFET and compensation network; 0.9–6V input.	Targeted at flexible DC-DC design with adjustable frequency and soft-start; lacks integrated switch and photocell interface.	Select when design requires programmable frequency, thermal foldback, or discrete FET optimization; reject for cost-sensitive, minimal-BOM lighting.

Compared with AL8805W5-7 and AP3012KTR-G1, the ZXLD383ET5TA uniquely combines sub-1V start-up, integrated switch, photocell diode, and inductor-set current in a 5-pin TSOT23-making it the only solution optimized for ultra-low-cost, single-cell solar garden lights and compact torches.

Availability

ZXLD383ET5TA is available at Aetrix Electronics and suitable for garden lighting systems, portable LED torches, and gated boost supply generators requiring stable component supply, long-lifecycle support, and consistent parametric performance across production batches.

Supply support for ZXLD383ET5TA 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-reliability, cost-optimized solutions for power management, signal integrity, and lighting applications.

The ZXLD383 belongs to Diodes' LED Driver product line, engineered specifically for ultra-low-voltage, single-cell portable and solar-powered lighting-prioritizing minimal external components, extended battery life, and photocell-integrated operation.

FAQ

What is the minimum input voltage required for ZXLD383ET5TA to start switching?

The ZXLD383ET5TA starts switching at V_CC = 0.8V (typical) under full load with 10µH inductor, as confirmed in Absolute Maximum Ratings and Electrical Characteristics tables. This enables operation deep into battery discharge, supporting NiMH cells down to 0.9V nominal and alkaline cells near end-of-life.

Can ZXLD383ET5TA drive multiple LEDs in series?

Yes - the internal switch supports up to 20V V_OUT, allowing series connection of up to five white LEDs (3.5V each). Output current remains constant (e.g., 50mA avg. with 6.8µH), but average current decreases as total V_LED increases due to reduced duty cycle and efficiency loss.

Is the NC pin (Pin 3) required to be left floating or grounded?

Pin 3 is internally open-circuited and must remain unconnected - neither grounded nor tied to any voltage. Soldering or routing to GND/VCC may cause undefined behavior or latch-up, as explicitly stated in the Pin Description table (DS32189 Rev. 3-2, p.3).

How does inductor value affect LED current and efficiency?

Larger inductors (e.g., 47µH vs. 6.8µH) reduce average LED current (8.5mA vs. 50mA) and peak current (45mA vs. 330mA), lowering switching losses but increasing conduction losses. Efficiency peaks at ~6.8–10µH (85%) and declines at extremes due to core loss or excessive ripple.

ZXLD383ET5TA 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

Type:: DC DC Regulator

Topology:: Step-Up (Boost)

Internal Switch(s):: Yes

Number of Outputs:: 1

Voltage - Supply (Min):: 0.9V

Voltage - Supply (Max):: 3.3V

Voltage - Output:: 20V

Current - Output / Channel:: 320mA (Switch)

Frequency:: 330kHz

Dimming:: -

Applications:: Backlight

Operating Temperature:: -20°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: TSOT-25

ZXLD383ET5TA FAQ

1.How can I place an order for ZXLD383ET5TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZXLD383ET5TA 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 ZXLD383ET5TA reliable?

The price and inventory of ZXLD383ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD383ET5TA is usually 5 days.

3.What payment methods are accepted for ZXLD383ET5TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD383ET5TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZXLD383ET5TA?

ZXLD383ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZXLD383ET5TA 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 ZXLD383ET5TA?

For technical support, including ZXLD383ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD383ET5TA requirements.

6.How does Aetrix verify that ZXLD383ET5TA is sourced from the original manufacturer or authorized distributors?

All ZXLD383ET5TA 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 ZXLD383ET5TA meets industry standards.

7.What is the process for return or replacement of ZXLD383ET5TA?

All ZXLD383ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD383ET5TA, 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 ZXLD383ET5TA part is unused and in its original packaging.

Return procedure for ZXLD383ET5TA:

1.Submit a request within 90 days.

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

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