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Diodes Incorporated ZXLD1322DCCTC
- Part No.:
- ZXLD1322DCCTC
- Manufacturer:
- Diodes Incorporated
- Category:
- LED Drivers
- Package:
- 14-UFDFN Exposed Pad
- Datasheet:
-
ZXLD1322DCCTC.pdf
- Description:
- IC LED DRV RGLTR PWM 700MA 14DFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,807
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Product details
Overview
ZXLD1322DCCTC from Diodes Incorporated is a buck/boost-mode inductive DC-DC LED driver IC with integrated NPN switch, high-side current monitor, and thermal compensation circuitry. It delivers up to 700mA output current across 2.5V–15V input, supports 3-series LED strings, achieves >85% efficiency, and provides 100–1% LED current adjustment via ADJ pin voltage or PWM. It is used in high-power LED flashlights requiring stable current regulation over temperature and battery discharge.
For engineers reviewing the ZXLD1322DCCTC datasheet, ZXLD1322DCCTC pinout, ZXLD1322DCCTC application, or ZXLD1322DCCTC equivalent, key selection criteria include its adjustable peak switch current (via RSENSE), thermal foldback capability (TADJ pin), 12μA standby current, and DFN4030-14 package with exposed pad for thermal management.
Technical Context
The ZXLD1322 operates in variable-frequency PFM mode with independent control of ON-time (determined by ISENSE threshold and coil dynamics) and OFF-time (modulated by ADJ voltage). Its internal 50mV current-sense reference sets peak switch current as ISWPEAK = 0.05 V / RSENSE, while the high-side current monitor uses RM to define nominal LED current as ILED(NOM) = 0.1 V / RM.
Thermal protection is implemented via TADJ pin: external thermistor network reduces output current linearly when die temperature exceeds threshold, with VTADJH = 75 mV and VTADJL = 50 mV. Over-temperature shutdown activates at ~150°C, disabling the switch until safe cooling occurs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.5V to 15V - supports single-cell Li-ion (3.0V min operational), alkaline, or multi-cell configurations without external LDO pre-regulation. |
| Max Output Current | 700mA - enables driving high-brightness white LEDs (e.g., 3× XP-G3) at full brightness with <±5% regulation accuracy. |
| Efficiency | 85% typical - achieved with optimized external coil and MOSFET-free design; reduces thermal load in compact flashlight PCBs. |
| Standby Current | 12μA - allows ultra-low-power shutdown during storage or idle, extending battery shelf life in portable lighting. |
| Current Regulation Drift | 100–200 ppm/K - ensures LED brightness stability across -40°C to +125°C ambient, critical for automotive backup lighting. |
| Thermal Foldback Threshold | 75 mV upper / 50 mV lower on TADJ - maps directly to NTC thermistor voltage divider for precise, user-defined LED derating onset. |
| Switching Frequency Range | 50 kHz to 600 kHz - avoids audio-band noise; frequency scales with load and VIN to maintain efficiency across dimming range. |
Pinout & Package
Package: DFN4030-14 (4mm × 3mm, 0.5mm pitch) with exposed thermal pad (Pin 15), rated for 1.5W dissipation at TA = 70°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| ADJ (1) | Brightness control & shutdown input | Accepts 50–500mV DC for 10–100% current scaling; <28mV disables device; PWM input enables 1% dimming resolution. |
| BIAS (2) | Internal switch base drive control | Shorted to GND for max 700mA output; resistor to GND reduces base current and limits peak switch current. |
| CFB (3) | Feedback loop integrator node | Connects 10nF capacitor to GND for loop compensation; integrates error between LED sense current and ADJ demand. |
| ISENSE (5) | Peak switch current sensing | Monitors emitter voltage drop across RSENSE; triggers switch turn-off when VISENSE ≥ 50mV (nominal). |
| EMITTER1/2 (6–7) | Switch emitter terminals | Both pins connect to top of RSENSE; parallel routing minimizes trace inductance and improves current-sense accuracy. |
| COLLECTOR1/2 (8–9) | Switch collector terminals | Both pins connect to coil low-side; parallel connection reduces conduction loss and thermal stress on internal NPN. |
| M_VIN (11) | High-side current monitor supply | Connected to VIN side of RM; enables accurate LED current sensing regardless of ground-referenced topology. |
| TADJ (13) | Thermal compensation input | Accepts voltage from NTC/resistor divider; linearly reduces LED current above preset temperature to prevent LED degradation. |
| VREF (14) | Internal 0.5V reference output | Stable 500mV ±20mV source used to bias ADJ pin and calibrate TADJ network; temperature coefficient 50 ppm/K. |
| Exposed Pad (15) | Thermal and electrical ground | Must be soldered to PCB copper pour for thermal dissipation and low-impedance GND return path for switch emitters. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-side current monitor | Enables true LED current sensing without shunt resistor in ground path-preserves system ground integrity and simplifies layout. |
| Adjustable soft-start via CFB | 10nF capacitor on CFB pin controls startup ramp rate, preventing inrush current spikes into LED string during power-on. |
| User-configurable thermal foldback | External NTC network on TADJ pin allows precise, application-specific LED derating curves-no firmware or external controller needed. |
| Low-voltage start-up mode | Operates down to 1.2V input using dedicated 50kHz oscillator-enables single alkaline or NiMH cell operation in emergency lighting. |
| Over-temperature shutdown | Hardware-level protection triggers at ~150°C junction temperature, disabling switch until safe thermal recovery-prevents permanent damage. |
Applications
| High-Power LED Flashlights | Automotive Backup Lighting |
|---|---|
|
Use Scenario: Handheld tactical flashlight powered by two 18650 Li-ion cells (6–8.4V), requiring consistent lumen output across battery discharge cycle. IC Role / Device Role / Timing Role: Buck/boost LED driver with integrated switch and current monitor-regulates 700mA through 3× high-flux LEDs independent of input voltage sag. Use Value: Maintains ±2% LED current from 8.4V to 6.0V input, eliminating visible dimming; 12μA shutdown extends shelf life beyond 2 years. |
Use Scenario: Rear-mounted LED backup lamp in commercial vehicle, operating from 9–16V unregulated battery rail with wide ambient temperature swing (-40°C to +85°C). IC Role / Device Role / Timing Role: Constant-current LED driver with thermal foldback-reduces output current above 85°C to protect LEDs while maintaining functional illumination. Use Value: Prevents LED color shift and lumen depreciation at high ambient; 100 ppm/K current drift ensures compliance with ECE R118 photometric stability requirements. |
| Industrial Portable Lighting | Emergency Exit Sign Illumination |
|
Use Scenario: Intrinsically safe mining headlamp powered by 3.7V LiPo, requiring robust over-temperature protection in confined, high-heat environments. IC Role / Device Role / Timing Role: LED driver with hardware-based thermal shutdown and foldback-monitors die temperature via TADJ and disables output at 150°C. Use Value: Eliminates need for external thermal sensor or microcontroller; meets IECEx/ATEX temperature class T4 (135°C surface limit) with margin. |
Use Scenario: Battery-backed exit sign with 24-hour runtime requirement, using supercapacitor or sealed lead-acid backup, needing ultra-low quiescent current during standby. IC Role / Device Role / Timing Role: LED current controller with 12μA shutdown mode-draws negligible current from backup source during AC mains failure. Use Value: Extends backup runtime by >15% versus comparable drivers; maintains LED current regulation accuracy within ±5% over full 24h discharge profile. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LED driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AL8862SP-13 | Boost-only topology; no buck/boost flexibility; requires external MOSFET; 600mA max output. | Limited to step-up only-unsuitable for single-cell or wide-input applications where VIN may exceed VLED. | Select if cost-sensitive and input always < LED string Vf; avoid when input can dip below 3V or exceed 12V. |
| LT3474EDD#PBF | True buck-boost architecture with synchronous rectification; 1.2A max; requires external MOSFETs; higher BOM count. | Supports wider VIN (2.8V–36V); better efficiency at high power but larger solution size and $2.50+ unit cost. | Select for >1A LED loads or >30V input; avoid for space-constrained flashlight designs where DFN4030-14 footprint is critical. |
Compared with AL8862SP-13 and LT3474EDD#PBF, the ZXLD1322DCCTC offers integrated switch + high-side sensing in a 4×3mm package, enabling lowest PCB area and simplest bill-of-materials for ≤700mA buck/boost LED systems with thermal foldback.
Availability
ZXLD1322DCCTC is available at Aetrix Electronics and suitable for high-power LED flashlights, automotive backup lighting, and industrial portable lighting requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for ZXLD1322DCCTC 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 power management, signal integrity, and LED lighting solutions with ISO/TS 16949-certified manufacturing.
The ZXLD1322 belongs to Diodes' LED Driver IC product line, designed specifically for cost-sensitive, thermally constrained portable and automotive LED applications requiring integrated current regulation and thermal protection without microcontroller dependency.
FAQ
What is the minimum input voltage required for ZXLD1322DCCTC to start switching?
The ZXLD1322DCCTC enters low-voltage start-up mode at VIN = 1.2V, using an internal 50kHz oscillator to drive the switch. Normal regulation begins once VIN rises above 2.2V (VUV+ threshold), with full 700mA capability restored above 3.0V. Below 1.2V, the device remains inactive.
Can ZXLD1322DCCTC drive more than three LEDs in series?
Yes-maximum LED string voltage depends on VIN and coil selection. With VIN = 15V and appropriate external components, the ZXLD1322DCCTC can support up to 12W output, enabling ~4–5 white LEDs (VF ≈ 3.2V each) in series at 700mA. Efficiency drops above 10W due to internal switch saturation losses.
How is LED current accuracy affected by external resistor tolerance?
Nominal LED current ILED(NOM) = 0.1 V / RM depends on RM tolerance; ±1% RM yields ±1% current error. The internal 50mV ISENSE reference has ±10% variation, contributing up to ±3% total output error. Combined, ±1% RM + standard components yield ±5% guaranteed current accuracy per datasheet.
Is the exposed thermal pad electrically isolated in ZXLD1322DCCTC?
No-the exposed pad (Pin 15) is internally connected to GND and must be soldered to a PCB ground plane. It serves dual purpose: thermal dissipation (RθJA reduced by ~30% when fully connected) and low-impedance return path for switch emitter current. Floating or insulated mounting degrades thermal performance and risks latch-up.
ZXLD1322DCCTC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 14-UFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- DC DC Regulator
- Topology:
- Step-Down (Buck), Step-Up (Boost)
- Internal Switch(s):
- Yes
- Number of Outputs:
- 1
- Voltage - Supply (Min):
- 2.5V
- Voltage - Supply (Max):
- 15V
- Voltage - Output:
- 18V
- Current - Output / Channel:
- 700mA
- Frequency:
- 600kHz
- Dimming:
- PWM
- Applications:
- Backlight, Lighting
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DFN4030-14
ZXLD1322DCCTC FAQ
1.How can I place an order for ZXLD1322DCCTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZXLD1322DCCTC 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 ZXLD1322DCCTC reliable?
The price and inventory of ZXLD1322DCCTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZXLD1322DCCTC is usually 5 days.
3.What payment methods are accepted for ZXLD1322DCCTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZXLD1322DCCTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZXLD1322DCCTC?
ZXLD1322DCCTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZXLD1322DCCTC 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 ZXLD1322DCCTC?
For technical support, including ZXLD1322DCCTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZXLD1322DCCTC requirements.
6.How does Aetrix verify that ZXLD1322DCCTC is sourced from the original manufacturer or authorized distributors?
All ZXLD1322DCCTC 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 ZXLD1322DCCTC meets industry standards.
7.What is the process for return or replacement of ZXLD1322DCCTC?
All ZXLD1322DCCTC units undergo pre-shipment inspection (PSI). If there is an issue with ZXLD1322DCCTC, 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 ZXLD1322DCCTC part is unused and in its original packaging.
Return procedure for ZXLD1322DCCTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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