Diodes Incorporated ZXLD1615QET5TA

Overview

ZXLD1615QET5TA from Diodes Incorporated is an automotive-qualified PFM inductive boost converter IC designed to generate adjustable LCD bias voltages up to 28V from 2.5V–5.5V input. It integrates an NDMOS switch, peak current sense resistor, and internal PWM low-pass filter; delivers up to 10mA at 28V output, features 60µA quiescent current, and operates in TSOT25 package for automotive LCD panel backlight and bias supply applications.

For engineers reviewing the ZXLD1615QET5TA datasheet, ZXLD1615QET5TA pinout, ZXLD1615QET5TA application, or ZXLD1615QET5TA equivalent, key selection criteria include AEC-Q100 Grade 3 qualification, PWM-adjustable DC output via EN pin, internal 1.025V feedback reference, 1MHz max switching frequency, and integrated gate drive with 1.75Ω R_DS(on) for high-efficiency flyback operation in space-constrained automotive displays.

Technical Context

The ZXLD1615QET5TA implements a discontinuous-conduction-mode (DCM) PFM control architecture with self-oscillating timing, where switch on-time is fixed up to 5µs and off-time varies with load to maintain regulation. The internal comparator compares FB voltage against a 1.025V reference to control LX switching, enabling precise output voltage setting via external resistive divider.

PWM-based output adjustment is achieved through an integrated 4kHz low-pass filter on the EN pin: applying 10–100kHz duty-cycled logic signals yields either continuous low-ripple DC output (analog mode) or gated output (gated mode), with V_OUT = D × V_OUT(NOM). The 120µs EN turn-off delay ensures stable gating behavior and prevents premature shutdown during PWM transitions.

Key Specifications

Pinout & Package

Package: TSOT25 - low-profile 5-pin surface-mount package (2.9mm × 2.8mm × 1.0mm), qualified for automotive under AEC-Q100 Grade 3, with green molding compound and lead-free/RoHS/halogen-free compliance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar LCD bias generator applications.

Compared with MAX1718EUT+T and TPS61165DRVR, the ZXLD1615QET5TA uniquely combines AEC-Q100 Grade 3 qualification, single-pin PWM-adjustable output, and integrated switch in a 5-pin TSOT25-making it optimal for space-constrained, cost-sensitive automotive LCD bias where dynamic voltage scaling and PPAP compliance are mandatory.

Availability

ZXLD1615QET5TA is available at Aetrix Electronics and suitable for automotive instrument clusters, infotainment displays, and ADAS camera view systems requiring stable component supply with full AEC-Q100 traceability and PPAP support.

Supply support for ZXLD1615QET5TA 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 power management, signal integrity, and protection solutions for automotive, industrial, and consumer markets.

The ZXLD1615Q belongs to Diodes' automotive-qualified LCD bias generator product line, engineered specifically for robust, low-component-count voltage boosting in TFT-LCD display subsystems operating across harsh automotive temperature and voltage ranges.

FAQ

What is the minimum input voltage required for ZXLD1615QET5TA to regulate 28V output?

The device requires ≥2.5V input to initiate switching and sustain regulation at 28V output. Below this threshold, the internal oscillator fails to activate the LX switch, resulting in no output. At VIN = 2.5V, full 28V output is achievable only with light loads (<2mA); heavier loads require higher input voltage to maintain duty cycle headroom.

Can ZXLD1615QET5TA drive a 20mA load at 25V output?

No-it is rated for up to 10mA at 28V. At 25V, maximum sustainable output current remains ~10mA due to internal 320mA peak switch current limit and thermal constraints in TSOT25. For 20mA loads, consider parallel configurations or higher-current alternatives like ZXLD1616Q (25mA at 28V), which shares identical pinout and control architecture.

How does the internal PWM filter affect EN pin timing requirements?

The 4kHz internal low-pass filter imposes strict timing constraints: EN PWM frequency must stay between 10kHz and 100kHz to ensure proper averaging without aliasing or attenuation. Frequencies below 10kHz cause incomplete filtering and erratic output; above 100kHz introduce phase delay errors that degrade DC output accuracy beyond ±5%.

Is external compensation required for stability with different output capacitor values?

No external compensation is needed-the ZXLD1615QET5TA's PFM control loop is inherently stable across 0.22µF to 10µF output capacitance. However, using <0.22µF increases output ripple and may cause audible coil whine; >10µF slows transient response but improves hold-up time. X7R dielectric is recommended for temperature stability.