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Diodes Incorporated ZXLD1101ET5TA
- Part No.:
- ZXLD1101ET5TA
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- SOT-23-5 Thin, TSOT-23-5
- Datasheet:
-
ZXLD1101ET5TA.pdf
- Description:
- IC LED DRVR RGLTR PWM TSOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,440
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Product details
Overview
ZXLD1101ET5TA from Diodes Incorporated (formerly Zetex) is a PFM inductive boost LED driver IC with integrated NDMOS switch and internal current-sense resistor, designed to drive 2–4 white LEDs from a Li-ion cell (2.5–5.5V input) or up to 8 LEDs from 5V, delivering up to 50mA output current with 28V max output voltage and 60µA quiescent current.
For engineers reviewing the ZXLD1101ET5TA datasheet, ZXLD1101ET5TA pinout, ZXLD1101ET5TA application, or ZXLD1101ET5TA equivalent, this device supports true analog dimming via PWM on the EN pin, operates in discontinuous conduction mode, features an internal 4kHz low-pass filter for flicker-free DC dimming, and targets space-constrained portable backlighting where height ≤1mm is critical.
Technical Context
The ZXLD1101ET5TA implements a self-oscillating PFM control loop that regulates LED current by sensing voltage across an external sense resistor (R1) at the FB pin and comparing it to a 100mV internal reference. Peak switch current is fixed at 320mA, and minimum off-time is 350ns to ensure stable DCM operation.
It supports two distinct dimming modes via the EN pin: filtered PWM (≥10kHz) yields continuous DC output current proportional to duty cycle (IOUT = 0.1·D/R1), while gated PWM (≤1kHz) produces chopped output with 120µs turn-off delay; both leverage the same pin for enable and current scaling without external filtering components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 5.5V - supports single-cell Li-ion and regulated 5V rails without external LDO. |
| Max Output Current | 50mA - sets upper limit for LED string current; actual value set by R1 = 100mV / ILED. |
| Max Output Voltage | 28V - enables driving up to 8 white LEDs (3.5V each) in series from 5V input. |
| Quiescent Current | 60µA typical - minimizes battery drain during active operation in portable devices. |
| Shutdown Current | <500nA - ensures near-zero power draw when EN = 0V, critical for standby longevity. |
| Switching Frequency | 0.35–1MHz - dynamically adjusts with load and input; higher frequencies reduce inductor size but increase switching loss. |
| FB Reference Voltage | 100mV ±9.5mV - defines precision of current regulation; tolerance directly impacts LED current accuracy. |
Pinout & Package
TSOT23-5 package: 1.00mm maximum height, 2.90mm × 2.80mm footprint, 0.95mm pin pitch, lead-free and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Senses voltage across external R1; closed-loop control point for LED current regulation at 100mV reference. |
| 2 GND | Power and signal ground | Common return path for switch, feedback, and enable circuits; must connect directly to low-impedance ground plane. |
| 3 LX | Switch node | Drives external inductor; connects to cathode of Schottky diode and anode of LED string; handles 320mA peak current. |
| 4 VIN | Input supply | Accepts 2.5–5.5V; requires local 1µF ceramic decoupling capacitor placed adjacent to pin. |
| 5 EN | Enable/dimming control | Active-high logic input; also accepts PWM signal (10kHz–100kHz) for analog dimming or low-frequency gating for pulsed output. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated NDMOS switch & current-sense resistor | Eliminates 2 external components; reduces BOM count and PCB area vs. controller-only solutions. |
| Internal 4kHz PWM low-pass filter | Enables flicker-free analog dimming using only a single PWM signal on EN-no external RC required. |
| Discontinuous conduction mode (DCM) operation | Ensures stable regulation across wide input/output voltage ratios and varying LED forward voltages. |
| 1mm profile TSOT23-5 package | Meets ultra-thin mobile design constraints (e.g., clamshell phones, slim PDAs) where Z-height is limited. |
| True analog dimming via EN pin | Supports seamless brightness control from 0% to 100% using standard MCU PWM outputs-no DAC or extra pins needed. |
Applications
| Mobile Phone LCD Backlight | Digital Camera Flash/Backlight |
|---|---|
|
Use Scenario: Driving 3–4 white LEDs for main/sub display backlight in GSM/CDMA handsets with Li-ion battery supply. IC Role / Device Role / Timing Role: Boost converter LED driver with integrated switch, regulating constant current via FB pin and enabling dimming via EN pin PWM. Use Value: Achieves 15mA LED current with ±10% accuracy using 6.8Ω R1; 60µA quiescent current extends talk time between charges. |
Use Scenario: Powering high-brightness white LED array for camera flash or rear LCD panel in compact digital cameras. IC Role / Device Role / Timing Role: Inductive boost controller operating in DCM to deliver stable 20–30mA per LED string from 3.3V or 5V rail. Use Value: Supports up to 28V output to drive 6-series LEDs; internal 320mA peak switch current avoids external MOSFET in most configurations. |
| PDA Display Illumination | Portable Internet Appliance UI Lighting |
|
Use Scenario: Providing uniform backlighting for monochrome or color TFT displays in handheld PDAs with tight board space. IC Role / Device Role / Timing Role: Compact LED driver IC managing current regulation and brightness control through single-pin EN interface. Use Value: TSOT23-5 footprint (2.9×2.8mm) and 1mm height allow placement behind thin display bezels; no external gate driver needed. |
Use Scenario: Illuminating status LEDs, keypads, or small OLED/LCD panels in Wi-Fi-enabled portable internet devices. IC Role / Device Role / Timing Role: Low-quiescent-current boost driver enabling always-on indicator lighting without significant battery load. Use Value: 500nA shutdown current preserves battery over weeks of standby; EN pin allows MCU to activate lighting only on user interaction. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP5724WUG-7 | Fixed 30mA output current; no adjustable R1-based programming; uses external PWM for dimming only. | Lacks true analog dimming via EN pin; requires separate dimming signal path; no FB pin for current calibration. | Choose if fixed-output-current simplicity outweighs need for programmable brightness range and precision current setting. |
| AL8805W5-7 | Higher 1.2A switch current rating; supports up to 120mA output; wider 2.5–40V input range; no internal current-sense resistor. | Requires external sense resistor and gate driver; larger SO-8 package; suited for higher-power industrial lighting, not portable backlighting. | Choose only if >50mA output or >28V output capability is required; otherwise over-spec'd and less space-efficient. |
Compared with AP5724WUG-7 and AL8805W5-7, ZXLD1101ET5TA uniquely combines programmable current (via R1), true analog dimming on one pin, sub-1mm height, and integrated switch/sense in TSOT23-5-making it optimal for cost- and space-sensitive portable LED backlighting.
Availability
ZXLD1101ET5TA is available at Aetrix Electronics and suitable for mobile phone LCD backlighting, digital camera display illumination, and PDA keypad lighting requiring stable component supply and long-term obsolescence management.
Supply support for ZXLD1101ET5TA 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 focused on efficiency, integration, and miniaturization.
The ZXLD1101 belongs to Zetex's legacy LED driver product line, engineered specifically for ultra-compact, battery-powered portable backlighting applications where height, quiescent current, and single-pin dimming are critical design constraints.
FAQ
What is the maximum number of white LEDs the ZXLD1101ET5TA can drive?
The ZXLD1101ET5TA can drive up to 4 white LEDs (each ~3.5V VF) from a 3.7V Li-ion cell, or up to 8 white LEDs from a 5V supply, based on its 28V maximum output voltage rating and PFM boost architecture. The actual count depends on total forward voltage and required current, with 2–4 LEDs being typical for handheld applications.
How does the EN pin support both enable and dimming functions?
The EN pin serves dual roles: applying a logic-high voltage (>1.5V) enables the device, while applying a PWM signal enables dimming. At ≥10kHz, the internal 4kHz low-pass filter converts PWM into a DC control voltage, yielding smooth analog dimming; at ≤1kHz, the device gates fully on/off, producing pulsed output current proportional to duty cycle.
What is the role of the FB pin and how is LED current set?
The FB pin is the high-impedance feedback input for the current regulation loop. LED current is set by connecting a resistor R1 from FB to GND; the internal 100mV reference forces VFB = 100mV, so ILED = 100mV / R1. For example, R1 = 6.8Ω sets 14.7mA, matching typical 15mA backlight requirements.
Is the ZXLD1101ET5TA still in active production or subject to obsolescence?
The ZXLD1101ET5TA is marked "Last Time Buy" in official documentation, indicating end-of-life status. Aetrix Electronics holds remaining authorized inventory and provides lifecycle availability coordination, including cross-reference support to AP5724WUG-7 for new designs where functional trade-offs are acceptable.
ZXLD1101ET5TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- SOT-23-5 Thin, TSOT-23-5
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- DC DC Regulator
- Topology:
- Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 5.5V
- Voltage - Output:
- 28V
- Current - Output / Channel:
- 50mA
- Frequency:
- 1MHz
- Dimming:
- Analog, PWM
- Applications:
- Backlight
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-5
ZXLD1101ET5TA FAQ
1.How can I place an order for ZXLD1101ET5TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1101ET5TA 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 ZXLD1101ET5TA reliable?
The price and inventory of ZXLD1101ET5TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1101ET5TA is usually 5 days.
3.What payment methods are accepted for ZXLD1101ET5TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1101ET5TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1101ET5TA?
ZXLD1101ET5TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1101ET5TA 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 ZXLD1101ET5TA?
For technical support, including ZXLD1101ET5TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1101ET5TA requirements.
6.How does Aetrix verify that ZXLD1101ET5TA is sourced from the original manufacturer or authorized distributors?
All ZXLD1101ET5TA 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 ZXLD1101ET5TA meets industry standards.
7.What is the process for return or replacement of ZXLD1101ET5TA?
All ZXLD1101ET5TA units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1101ET5TA, 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 ZXLD1101ET5TA part is unused and in its original packaging.
Return procedure for ZXLD1101ET5TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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